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<main role="main">
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<!--Weave of 'Nonlocal Variables' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7 Modules</a></li><li><a href="index.html">core</a></li><li><a href="index.html#6">Chapter 6: Nouns</a></li><li><b>Nonlocal Variables</b></li></ul></div>
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<p class="purpose">To manage variables whose scope is wider than the current rule.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Though the following structure is rather cluttered, the idea is simple
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enough: a non-local variable — it may be global, or may belong to a rulebook,
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an action, or an activity — is like a property, but simpler. It belongs to
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no particular object, so we don't need to worry about permissions for it to
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exist; we can simply record inferences about its value.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname_form</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">textual_form</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">nothing_form</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">stv_ID</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">stv_index</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">allow_outside</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">use_own_iname</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">name</span><span class="plain-syntax">; </span><span class="comment-syntax"> text of the name</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv_created_at</span><span class="plain-syntax">; </span><span class="comment-syntax"> sentence creating the variable</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">var_documentation_symbol</span><span class="plain-syntax">; </span><span class="comment-syntax"> reference to manual, if any</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">stacked_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">scope</span><span class="plain-syntax">; </span><span class="comment-syntax"> where it exists, or </span><span class="extract"><span class="extract-syntax">NULL</span></span><span class="comment-syntax"> for everywhere</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv_kind</span><span class="plain-syntax">; </span><span class="comment-syntax"> what kind of value it holds</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv_knowledge</span><span class="plain-syntax">; </span><span class="comment-syntax"> what we know about its initial value</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">constant_at_run_time</span><span class="plain-syntax">; </span><span class="comment-syntax"> for instance, for "story title"</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">alias_to_infs</span><span class="plain-syntax">; </span><span class="comment-syntax"> like "player" to "yourself"</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">housed_in_variables_array</span><span class="plain-syntax">; </span><span class="comment-syntax"> i.e. </span><span class="extract"><span class="extract-syntax">FALSE</span></span><span class="comment-syntax"> if stored elsewhere</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">var_is_initialisable_anyway</span><span class="plain-syntax">; </span><span class="comment-syntax"> despite being stored elsewhere, that is</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">var_is_bibliographic</span><span class="plain-syntax">; </span><span class="comment-syntax"> one of the bibliographic constants set at the end</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">var_is_allowed_to_be_zero</span><span class="plain-syntax">; </span><span class="comment-syntax"> for an empty enumerated kind, despite non-safety</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv_iname</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv_name_translated</span><span class="plain-syntax">; </span><span class="comment-syntax"> has this been given storage as an I6 variable?</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="identifier-syntax">rvalue_nve</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="identifier-syntax">lvalue_nve</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv_write_schema</span><span class="plain-syntax">; </span><span class="comment-syntax"> or </span><span class="extract"><span class="extract-syntax">NULL</span></span><span class="comment-syntax"> to assign to the L-value form</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">substitution_marker</span><span class="plain-syntax">; </span><span class="comment-syntax"> to prevent infinite regress when substituting</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure nonlocal_variable_emission is private to this section.</li><li>The structure nonlocal_variable is accessed in 2/sq, 2/si, 4/nuor, 4/dbtr, 4/rpr, 5/ass, 5/pk, 6/ins, 9/ef, 14/lv, 14/ds2, 15/pr, 15/ep, 15/vp, 15/spr, 16/in, 16/cmw, 17/rs, 19/tc, 19/tb, 20/eq, 21/rl, 21/rl2, 21/fao, 21/sv, 21/ac, 22/pu, 22/dptd, 22/po, 22/pav, 25/cii, 26/ts, 26/uoart and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>These three special NLVs are used for the "notable" hacky Standard Rules
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variables mentioned below:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i6_glob_VAR</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i6_nothing_VAR</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="comment-syntax"> the I6 </span><span class="extract"><span class="extract-syntax">nothing</span></span><span class="comment-syntax"> constant</span>
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<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">command_prompt_VAR</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="comment-syntax"> the command prompt text</span>
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<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">parameter_object_VAR</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>We record the one most recently made:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">latest_nonlocal_variable</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::get_latest</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::get_latest</span></span>:<br/>The Creator - <a href="5-tc.html#SP5_4_2_2">§5.4.2.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">latest_nonlocal_variable</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>These are variable names which Inform provides special support for; it
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recognises the English names when they are defined by the Standard Rules. (So
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there is no need to translate this to other languages.) The first two are
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hacky constructs which only the SR should ever refer to.
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</p>
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<pre class="Preform-displayed-code all-displayed-code code-font">
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<span class="Preform-function-syntax"><notable-variables></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">i6-varying-global</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">i6-nothing-constant</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">command</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">prompt</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">parameter-object</span>
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</pre>
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<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>We can create a new variable provided we give its name, kind and scope.
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When the scope isn't global, the variable is said to be "stacked", which is a
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reference to how it's stored at run-time.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::new_global</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::new_global</span></span>:<br/>Assert Propositions - <a href="12-ap.html#SP8_5_2">§8.5.2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">PROTECTED_MODEL_PROCEDURE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="6-nv.html#SP6" class="function-link"><span class="function-syntax">NonlocalVariables::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::new_stacked</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::new_stacked</span></span>:<br/>Stacked Variables - <a href="21-sv.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">stacked_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">scope</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">scope</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"not a stacked nonlocal_variable at all"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="6-nv.html#SP6" class="function-link"><span class="function-syntax">NonlocalVariables::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="identifier-syntax">scope</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::new</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::new</span></span>:<br/><a href="6-nv.html#SP5">§5</a>, <a href="6-nv.html#SP19">§19</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="reserved-syntax">stacked_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">scope</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">K</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"created variable without kind"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::Behaviour::definite</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="6-nv.html#SP6_1" class="named-paragraph-link"><span class="named-paragraph">Issue problem message for an indefinite variable</span><span class="named-paragraph-number">6.1</span></a></span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-nv.html#SP6_3" class="named-paragraph-link"><span class="named-paragraph">Actually create the nonlocal variable</span><span class="named-paragraph-number">6.3</span></a></span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">latest_nonlocal_variable</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-nv.html#SP6_2" class="named-paragraph-link"><span class="named-paragraph">Take note if the notable variables turn up here</span><span class="named-paragraph-number">6.2</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="26-pc.html#SP6" class="function-link"><span class="function-syntax">Plugins::Call::new_variable_notify</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">VARIABLE_CREATIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"Created non-library variable: $Z\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6_1" class="paragraph-anchor"></a><b>§6.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Issue problem message for an indefinite variable</span><span class="named-paragraph-number">6.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-sq.html#SP3" class="function-link"><span class="function-syntax">Problems::quote_kind</span></a><span class="plain-syntax">(2, </span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_IndefiniteVariable</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"I am unable to create the variable '%1', because its kind (%2) is too "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"vague. I need to know exactly what kind of value goes into each "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"variable: for instance, it's not enough to say 'L is a list of values "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that varies', because I don't know what the entries have to be - 'L "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"is a list of numbers that varies' would be better."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="6-nv.html#SP6">§6</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP6_2" class="paragraph-anchor"></a><b>§6.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Take note if the notable variables turn up here</span><span class="named-paragraph-number">6.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="function-syntax"><notable-variables></span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="function-syntax"><<r>></span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">: </span><span class="identifier-syntax">i6_glob_VAR</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span><span class="plain-syntax">: </span><span class="identifier-syntax">i6_nothing_VAR</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span><span class="plain-syntax">: </span><span class="identifier-syntax">command_prompt_VAR</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">3</span><span class="plain-syntax">: </span><span class="identifier-syntax">parameter_object_VAR</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="6-nv.html#SP6">§6</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP6_3" class="paragraph-anchor"></a><b>§6.3. </b>Note that we only register the name of the variable as a meaning if it's
|
|
global, because it otherwise may mean different things in different places.
|
|
The knowledge about a variable is initially just that it is certainly a
|
|
variable; this means it inherits from the inference subject representing
|
|
all variables, and that in turn is good because it means it gets permission
|
|
to have the "initial value" property.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Actually create the nonlocal variable</span><span class="named-paragraph-number">6.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">var_documentation_symbol</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Index::DocReferences::position_of_symbol</span><span class="plain-syntax">(&</span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">W</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_created_at</span><span class="plain-syntax"> = </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax"> = </span><span class="identifier-syntax">K</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">rvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::new</span><span class="plain-syntax">(); </span><span class="comment-syntax"> we won't decide their run-time storage until later</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">rvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">iname_form</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::new</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">iname_form</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">housed_in_variables_array</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_iname</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_name_translated</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">alias_to_infs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_write_schema</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">constant_at_run_time</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">var_is_initialisable_anyway</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">var_is_allowed_to_be_zero</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">scope</span><span class="plain-syntax"> = </span><span class="identifier-syntax">scope</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">substitution_marker</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) && (</span><span class="identifier-syntax">scope</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)) </span><span class="comment-syntax"> that is, if it's a global</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Nouns::new_proper_noun</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">NEUTER_GENDER</span><span class="plain-syntax">, </span><span class="identifier-syntax">ADD_TO_LEXICON_NTOPT</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">VARIABLE_MC</span><span class="plain-syntax">, </span><a href="14-lv.html#SP2" class="function-link"><span class="function-syntax">Lvalues::new_actual_NONLOCAL_VARIABLE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">), </span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::language_of_syntax</span></a><span class="plain-syntax">());</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_knowledge</span><span class="plain-syntax"> =</span>
|
|
<span class="plain-syntax"> </span><a href="16-is.html#SP8" class="function-link"><span class="function-syntax">InferenceSubjects::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nonlocal_variables</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">VARI_SUB</span><span class="plain-syntax">, </span><span class="identifier-syntax">STORE_POINTER_nonlocal_variable</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">), </span><span class="identifier-syntax">CERTAIN_CE</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="6-nv.html#SP6">§6</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>So much for creation; and here's how we log them:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::log</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::log</span></span>:<br/>Core Module - <a href="1-cm.html#SP5">§5</a>, <a href="1-cm.html#SP6_6">§6.6</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP7" class="function-link"><span class="function-syntax">NonlocalVariables::write</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">DL</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::write</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::write</span></span>:<br/>Core Module - <a href="1-cm.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) { </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"<null variable>"</span><span class="plain-syntax">); </span><span class="reserved-syntax">return</span><span class="plain-syntax">; }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"'%W'(%s)"</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">, (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">constant_at_run_time</span><span class="plain-syntax">)?</span><span class="string-syntax">"const"</span><span class="plain-syntax">:</span><span class="string-syntax">"var"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Kinds::Textual::write</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. </b>It turns out to be convenient to have this routine around. Note that
|
|
parsing only picks up globals (see note on name registration above).
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::parse</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::parse</span></span>:<br/><a href="6-nv.html#SP9">§9</a><br/>Refine Parse Tree - <a href="5-rpt.html#SP4">§4</a><br/>Compile Invocations Inline - <a href="25-cii.html#SP8">§8</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Articles::remove_the</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="function-syntax"><s-global-variable></span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val</span><span class="plain-syntax"> = </span><span class="function-syntax"><<rp>></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">Node::get_constant_nonlocal_variable</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. </b>We need the flexibility to store the variable's value in a range of
|
|
different ways at run-time. One way this is used is to allow the source
|
|
text (generally the Standard Rules) to say that an already-existing I6
|
|
variable should hold it:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::translates</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::translates</span></span>:<br/>Translation Requests - <a href="4-tr.html#SP7_2_2">§7.2.2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP8" class="function-link"><span class="function-syntax">NonlocalVariables::parse</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">scope</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Tried %W\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_NonQuantityTranslated</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"this is not the name of a variable"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"or at any rate not one global in scope."</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_name_translated</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_QuantityTranslatedAlready</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"this variable has already been translated"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"so there must be some duplication somewhere."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_name_translated</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">)</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">, </span><span class="string-syntax">"%N"</span><span class="plain-syntax">, </span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">p2</span><span class="plain-syntax">)));</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"nothing"</span><span class="plain-syntax">)) {</span>
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|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::nve_from_nothing</span></a><span class="plain-syntax">());</span>
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|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::nve_from_nothing</span></a><span class="plain-syntax">());</span>
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|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">as_iname</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Produce::find_by_name</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">name</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::nve_from_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">as_iname</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::nve_from_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">as_iname</span><span class="plain-syntax">));</span>
|
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<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">VARIABLE_CREATIONS</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"Translated variable: $Z as %N\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">p2</span><span class="plain-syntax">)));</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
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<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>§10. </b>In general, the following allows us to set the R-value and L-value forms
|
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of the variable's storage. An R-value is the form of the variable on the
|
|
right-hand side of an assignment, that is, when we're reading it; an L-value
|
|
is the form used when we're setting it. Often these will be the same, but
|
|
not always.
|
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</p>
|
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|
|
<pre class="displayed-code all-displayed-code code-font">
|
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::set_I6_identifier</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></span>:<br/><a href="6-nv.html#SP9">§9</a>, <a href="6-nv.html#SP12">§12</a>, <a href="6-nv.html#SP19">§19</a><br/>Stacked Variables - <a href="21-sv.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">left</span><span class="plain-syntax">, </span><span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">) {</span>
|
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax">) > </span><span class="constant-syntax">30</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"name too long"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"null nlv"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">left</span><span class="plain-syntax">) </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nve</span><span class="plain-syntax">; </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">rvalue_nve</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nve</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">housed_in_variables_array</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::new_nve</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">iname_form</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::new</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">stv_ID</span><span class="plain-syntax"> = -1;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">stv_index</span><span class="plain-syntax"> = -1;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">allow_outside</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">use_own_iname</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">nothing_form</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::nve_from_nothing</span><button class="popup" onclick="togglePopup('usagePopup10')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup10">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::nve_from_nothing</span></span>:<br/><a href="6-nv.html#SP9">§9</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::new_nve</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax">, </span><span class="string-syntax">"nothing"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">nothing_form</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::nve_from_iname</span><button class="popup" onclick="togglePopup('usagePopup11')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup11">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::nve_from_iname</span></span>:<br/><a href="6-nv.html#SP9">§9</a>, <a href="6-nv.html#SP19">§19</a><br/>Stacked Variables - <a href="21-sv.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::new_nve</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">iname_form</span><span class="plain-syntax"> = </span><span class="identifier-syntax">iname</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax">, </span><span class="string-syntax">"%n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">iname</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::nve_from_mstack</span><button class="popup" onclick="togglePopup('usagePopup12')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup12">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::nve_from_mstack</span></span>:<br/>Stacked Variables - <a href="21-sv.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">index</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">allow_outside</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::new_nve</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">allow_outside</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax">, </span><span class="string-syntax">"(MStack-->MstVON(%d,%d))"</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">index</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax">, </span><span class="string-syntax">"(MStack-->MstVO(%d,%d))"</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">index</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">stv_ID</span><span class="plain-syntax"> = </span><span class="identifier-syntax">N</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">stv_index</span><span class="plain-syntax"> = </span><span class="identifier-syntax">index</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">allow_outside</span><span class="plain-syntax"> = </span><span class="identifier-syntax">allow_outside</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::nve_from_pos</span><button class="popup" onclick="togglePopup('usagePopup13')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup13">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::nve_from_pos</span></span>:<br/><a href="6-nv.html#SP12">§12</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::new_nve</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">.</span><span class="element-syntax">use_own_iname</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>§11. </b>Later, when we actually need to know where these are being stored, we assign
|
|
run-time locations to any variable without them:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::identifier</span><button class="popup" onclick="togglePopup('usagePopup14')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup14">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::identifier</span></span>:<br/><a href="6-nv.html#SP15">§15</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">rvalue_nve</span><span class="plain-syntax">.</span><span class="identifier-syntax">textual_form</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><a href="6-nv.html#SP12" class="function-link"><span class="function-syntax">NonlocalVariables::allocate_storage</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">rvalue_nve</span><span class="plain-syntax">.</span><span class="identifier-syntax">textual_form</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="6-nv.html#SP11_1" class="named-paragraph-link"><span class="named-paragraph">Issue a missing meaning problem</span><span class="named-paragraph-number">11.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">rvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::emit_lvalue</span><button class="popup" onclick="togglePopup('usagePopup15')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup15">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::emit_lvalue</span></span>:<br/>Lvalues - <a href="14-lv.html#SP13_2">§13.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">iname_form</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val_iname</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">iname_form</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">stv_ID</span><span class="plain-syntax"> >= </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::inv_primitive</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">LOOKUP_BIP</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::down</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">());</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val_iname</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">MSTACK_HL</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">ex</span><span class="plain-syntax"> = </span><span class="constant-syntax">MSTVO_HL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">allow_outside</span><span class="plain-syntax">) </span><span class="identifier-syntax">ex</span><span class="plain-syntax"> = </span><span class="constant-syntax">MSTVON_HL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::inv_call_iname</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ex</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::down</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">());</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_number</span><span class="plain-syntax">, </span><span class="identifier-syntax">LITERAL_IVAL</span><span class="plain-syntax">, (</span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">stv_ID</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_number</span><span class="plain-syntax">, </span><span class="identifier-syntax">LITERAL_IVAL</span><span class="plain-syntax">, (</span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">stv_index</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::up</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">());</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::up</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">());</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">use_own_iname</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val_iname</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="6-nv.html#SP15" class="function-link"><span class="function-syntax">NonlocalVariables::iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">nothing_form</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val_symbol</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">Site::veneer_symbol</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">NOTHING_VSYMB</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"improperly formed nve"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP11_1" class="paragraph-anchor"></a><b>§11.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Issue a missing meaning problem</span><span class="named-paragraph-number">11.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">BelievedImpossible</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"The sentence %1 seems to need the value '%2', but that currently "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"has no definition."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"self"</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="6-nv.html#SP11">§11</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP12" class="paragraph-anchor"></a><b>§12. </b>And the allocation is done here. Variables not stored anywhere else are
|
|
marked to be housed in an array, though it's really up to the code-generator
|
|
tp make that decision:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::allocate_storage</span><button class="popup" onclick="togglePopup('usagePopup16')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup16">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::allocate_storage</span></span>:<br/><a href="6-nv.html#SP11">§11</a>, <a href="6-nv.html#SP15">§15</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">var</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">var</span><span class="plain-syntax">, </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (((</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">var</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">var</span><span class="plain-syntax">-></span><span class="element-syntax">rvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">)) &&</span>
|
|
<span class="plain-syntax"> ((</span><span class="identifier-syntax">var</span><span class="plain-syntax">-></span><span class="element-syntax">constant_at_run_time</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">var</span><span class="plain-syntax">-></span><span class="element-syntax">var_is_bibliographic</span><span class="plain-syntax">))) {</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">var</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::nve_from_pos</span></a><span class="plain-syntax">());</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">var</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::nve_from_pos</span></a><span class="plain-syntax">());</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">var</span><span class="plain-syntax">-></span><span class="element-syntax">housed_in_variables_array</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP13" class="paragraph-anchor"></a><b>§13. </b>In extreme cases, even that flexibility isn't enough. For example, the
|
|
"location" variable is rigged so that changing it causes code in the I6
|
|
template to be called, because the world model must be kept consistent when
|
|
the player character moves room. So it's even possible to set an explicit
|
|
I6 schema for how to change a variable:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::set_write_schema</span><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_write_schema</span><span class="plain-syntax"> = </span><span class="identifier-syntax">sch</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::get_write_schema</span><button class="popup" onclick="togglePopup('usagePopup17')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup17">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::get_write_schema</span></span>:<br/>The Equality Relation Revisited - <a href="12-terr.html#SP5_3">§5.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP13" class="function-link"><span class="function-syntax">NonlocalVariables::warn_about_change</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_write_schema</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::warn_about_change</span><button class="popup" onclick="togglePopup('usagePopup18')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup18">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::warn_about_change</span></span>:<br/>Compile Invocations Inline - <a href="25-cii.html#SP3_5_4_2">§3.5.4.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">score_VAR</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">score_VAR</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">global_compilation_settings</span><span class="plain-syntax">.</span><span class="element-syntax">scoring_option_set</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">global_compilation_settings</span><span class="plain-syntax">.</span><span class="element-syntax">scoring_option_set</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NOT_APPLICABLE</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_CantChangeScore</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"this is a story with no scoring"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"so it makes no sense to change the 'score' value. You can add "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"scoring to the story by including the sentence 'Use scoring.', "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"in which case this problem message will go away; or you can "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"remove it with 'Use no scoring.' (Until 2011, the default was "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"to have scoring, but now it's not to have scoring.)"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP14" class="paragraph-anchor"></a><b>§14. </b>Here are the standard routines allowing NLVs to be inference subjects:
|
|
there's very little to say.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::SUBJ_get_name_text</span><button class="popup" onclick="togglePopup('usagePopup19')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup19">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::SUBJ_get_name_text</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP23">§23</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> = </span><a href="16-is.html#SP18" class="function-link"><span class="function-syntax">InferenceSubjects::as_nlv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="identifier-syntax">general_pointer</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::SUBJ_new_permission_granted</span><button class="popup" onclick="togglePopup('usagePopup20')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup20">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::SUBJ_new_permission_granted</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP24">§24</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL_GENERAL_POINTER</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::SUBJ_make_adj_const_domain</span><button class="popup" onclick="togglePopup('usagePopup21')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup21">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::SUBJ_make_adj_const_domain</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP25">§25</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nc</span><span class="plain-syntax">, </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::SUBJ_complete_model</span><button class="popup" onclick="togglePopup('usagePopup22')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup22">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::SUBJ_complete_model</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP26">§26</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::SUBJ_check_model</span><button class="popup" onclick="togglePopup('usagePopup23')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup23">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::SUBJ_check_model</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP27">§27</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::SUBJ_emit_element_of_condition</span><button class="popup" onclick="togglePopup('usagePopup24')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup24">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::SUBJ_emit_element_of_condition</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP28">§28</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">t0_s</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"NLV in runtime match condition"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::SUBJ_compile</span><button class="popup" onclick="togglePopup('usagePopup25')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup25">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::SUBJ_compile</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP29">§29</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::get_knowledge</span><button class="popup" onclick="togglePopup('usagePopup26')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup26">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::get_knowledge</span></span>:<br/><a href="6-nv.html#SP16">§16</a>, <a href="6-nv.html#SP20">§20</a><br/>The Equality Relation Revisited - <a href="12-terr.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_knowledge</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP15" class="paragraph-anchor"></a><b>§15. </b>The iname is created on demand:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::iname</span><button class="popup" onclick="togglePopup('usagePopup27')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup27">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::iname</span></span>:<br/><a href="6-nv.html#SP11">§11</a><br/>Compile Invocations Inline - <a href="25-cii.html#SP8">§8</a><br/>Routines - <a href="26-rt.html#SP4_1_2">§4.1.2</a>, <a href="26-rt.html#SP4_1_4">§4.1.4</a><br/>Hierarchy - <a href="27-hr.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_iname</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">package_request</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</span><span class="plain-syntax"> = </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::package</span></a><span class="plain-syntax">(</span><a href="27-cm.html#SP5" class="function-link"><span class="function-syntax">CompilationUnits::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_created_at</span><span class="plain-syntax">), </span><span class="constant-syntax">VARIABLES_HAP</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::markup_wording</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">, </span><span class="constant-syntax">VARIABLE_NAME_HMD</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_iname</span><span class="plain-syntax"> = </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_iname_with_memo</span></a><span class="plain-syntax">(</span><span class="constant-syntax">VARIABLE_HL</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_iname</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::SUBJ_compile_all</span><button class="popup" onclick="togglePopup('usagePopup28')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup28">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::SUBJ_compile_all</span></span>:<br/>Inference Subjects - <a href="16-is.html#SP29">§29</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="6-nv.html#SP12" class="function-link"><span class="function-syntax">NonlocalVariables::allocate_storage</span></a><span class="plain-syntax">(); </span><span class="comment-syntax"> in case this hasn't happened already</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-nv.html#SP15_1" class="named-paragraph-link"><span class="named-paragraph">Verify that externally-stored nonlocals haven't been initialised</span><span class="named-paragraph-number">15.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP16" class="function-link"><span class="function-syntax">NonlocalVariables::origin_of_initial_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="6-nv.html#SP16" class="function-link"><span class="function-syntax">NonlocalVariables::has_initial_value_set</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="5-pk.html#SP1" class="function-link"><span class="function-syntax">Assertions::PropertyKnowledge::verify_global_variable</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">constant_at_run_time</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) ||</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">housed_in_variables_array</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">BEGIN_COMPILATION_MODE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_EXIT</span><span class="plain-syntax">(</span><span class="constant-syntax">DEREFERENCE_POINTERS_CMODE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP15" class="function-link"><span class="function-syntax">NonlocalVariables::iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">v1</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="6-nv.html#SP24" class="function-link"><span class="function-syntax">NonlocalVariables::seek_initial_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, &</span><span class="identifier-syntax">v1</span><span class="plain-syntax">, &</span><span class="identifier-syntax">v2</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
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|
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|
<span class="plain-syntax"> </span><span class="constant-syntax">END_COMPILATION_MODE</span><span class="plain-syntax">;</span>
|
|
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">rvalue</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">housed_in_variables_array</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">)</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">rvalue</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP11" class="function-link"><span class="function-syntax">NonlocalVariables::identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><a href="27-em.html#SP3" class="function-link"><span class="function-syntax">Emit::variable</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">v1</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</span><span class="plain-syntax">, </span><span class="identifier-syntax">rvalue</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">command_prompt_VAR</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cpt_iname</span><span class="plain-syntax"> = </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COMMANDPROMPTTEXT_HL</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">packaging_state</span><span class="plain-syntax"> </span><span class="identifier-syntax">save</span><span class="plain-syntax"> = </span><a href="26-rt.html#SP1" class="function-link"><span class="function-syntax">Routines::begin</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">cpt_iname</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::inv_primitive</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">RETURN_BIP</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::down</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">());</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val_iname</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_text</span><span class="plain-syntax">, </span><span class="identifier-syntax">iname</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::up</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">());</span>
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<span class="plain-syntax"> </span><a href="26-rt.html#SP4" class="function-link"><span class="function-syntax">Routines::end</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">save</span><span class="plain-syntax">);</span>
|
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<span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_available</span></a><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">cpt_iname</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP15_1" class="paragraph-anchor"></a><b>§15.1. </b>If a variable is said to be the same as, say, <span class="extract"><span class="extract-syntax">my_var</span></span> defined in some
|
|
I6 code somewhere out of our reach, then it makes no sense to allow the
|
|
source text to specify its initial value — the initial value is whatever
|
|
that faraway I6 code said it was.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Verify that externally-stored nonlocals haven't been initialised</span><span class="named-paragraph-number">15.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">housed_in_variables_array</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) &&</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">var_is_initialisable_anyway</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) &&</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">alias_to_infs</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) &&</span>
|
|
<span class="plain-syntax"> (</span><a href="6-nv.html#SP16" class="function-link"><span class="function-syntax">NonlocalVariables::has_initial_value_set</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">)))</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-nv.html#SP15_1_1" class="named-paragraph-link"><span class="named-paragraph">Issue a problem message for an impossible initialisation</span><span class="named-paragraph-number">15.1.1</span></a></span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="6-nv.html#SP15">§15</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP15_1_1" class="paragraph-anchor"></a><b>§15.1.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Issue a problem message for an impossible initialisation</span><span class="named-paragraph-number">15.1.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP16" class="function-link"><span class="function-syntax">NonlocalVariables::origin_of_initial_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_stream</span><span class="plain-syntax">(3, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">lvalue_nve</span><span class="plain-syntax">.</span><span class="element-syntax">textual_form</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_InaccessibleVariable</span><span class="plain-syntax">));</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"The sentence %1 tells me that '%2' has a specific initial value, "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"but this is a variable which has been translated into an I6 'Global' "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"called '%3' at the lowest level of Inform. Any initial value must be "</span>
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|
<span class="plain-syntax"> </span><span class="string-syntax">"given in its I6 definition, not here."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
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|
</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="6-nv.html#SP15_1">§15.1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP16" class="paragraph-anchor"></a><b>§16. </b>So, as we've seen, each variable is an inference subject. The initial knowledge
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|
about it is that it's a variable, and as such, has permission to have the
|
|
"variable initial value" property. So:
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|
</p>
|
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|
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<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::get_initial_value</span><button class="popup" onclick="togglePopup('usagePopup29')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup29">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::get_initial_value</span></span>:<br/><a href="6-nv.html#SP22">§22</a>, <a href="6-nv.html#SP23">§23</a>, <a href="6-nv.html#SP24">§24</a><br/>Property Knowledge - <a href="5-pk.html#SP1">§1</a><br/>Inference Subjects - <a href="16-is.html#SP11">§11</a><br/>Inferences - <a href="16-in.html#SP18">§18</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inf</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP14" class="function-link"><span class="function-syntax">NonlocalVariables::get_knowledge</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">POSITIVE_KNOWLEDGE_LOOP</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="constant-syntax">PROPERTY_INF</span><span class="plain-syntax">)</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="16-in.html#SP10" class="function-link"><span class="function-syntax">World::Inferences::get_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">) == </span><span class="identifier-syntax">P_variable_initial_value</span><span class="plain-syntax">)</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="16-in.html#SP10" class="function-link"><span class="function-syntax">World::Inferences::get_property_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="14-sp.html#SP10" class="function-link"><span class="function-syntax">Specifications::new_UNKNOWN</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
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|
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|
<span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::origin_of_initial_value</span><button class="popup" onclick="togglePopup('usagePopup30')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup30">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::origin_of_initial_value</span></span>:<br/><a href="6-nv.html#SP15">§15</a>, <a href="6-nv.html#SP15_1_1">§15.1.1</a>, <a href="6-nv.html#SP24">§24</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inf</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP14" class="function-link"><span class="function-syntax">NonlocalVariables::get_knowledge</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">POSITIVE_KNOWLEDGE_LOOP</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="constant-syntax">PROPERTY_INF</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="16-in.html#SP10" class="function-link"><span class="function-syntax">World::Inferences::get_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">) == </span><span class="identifier-syntax">P_variable_initial_value</span><span class="plain-syntax">)</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="16-in.html#SP10" class="function-link"><span class="function-syntax">World::Inferences::where_inferred</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::has_initial_value_set</span><button class="popup" onclick="togglePopup('usagePopup31')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup31">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::has_initial_value_set</span></span>:<br/><a href="6-nv.html#SP15">§15</a>, <a href="6-nv.html#SP15_1">§15.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) && (</span><a href="6-nv.html#SP16" class="function-link"><span class="function-syntax">NonlocalVariables::origin_of_initial_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">))) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::allow_to_be_zero</span><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">var_is_allowed_to_be_zero</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP17" class="paragraph-anchor"></a><b>§17. </b>Now for some basic properties:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::is_global</span><button class="popup" onclick="togglePopup('usagePopup32')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup32">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::is_global</span></span>:<br/><a href="6-nv.html#SP26">§26</a><br/>Extension Files - <a href="9-ef.html#SP8_3">§8.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">scope</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP18" class="paragraph-anchor"></a><b>§18. </b>The kind can in fact be changed after creation, though this never happens
|
|
to variables declared in source text: it allows us to have a few globals which
|
|
are reused for different purposes and are typeless.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::set_kind</span><button class="popup" onclick="togglePopup('usagePopup33')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup33">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::set_kind</span></span>:<br/><a href="6-nv.html#SP19">§19</a><br/>Assertions - <a href="5-ass.html#SP6_3_39_1">§6.3.39.1</a><br/>Compile Invocations - <a href="25-ci.html#SP2_2_3_3_1_1">§2.2.3.3.1.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"set kind for null variable"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax"> = </span><span class="identifier-syntax">K</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::kind</span><button class="popup" onclick="togglePopup('usagePopup34')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup34">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::kind</span></span>:<br/>Assertions - <a href="5-ass.html#SP6_3_39_1">§6.3.39.1</a><br/>Property Knowledge - <a href="5-pk.html#SP2">§2</a><br/>Lvalues - <a href="14-lv.html#SP11_2">§11.2</a><br/>Stacked Variables - <a href="21-sv.html#SP3">§3</a>, <a href="21-sv.html#SP3_1">§3.1</a>, <a href="21-sv.html#SP3_2">§3.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP19" class="paragraph-anchor"></a><b>§19. </b>Here's an example of that kind-setting in action:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::temporary_from_iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">temp_iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i6_glob_VAR</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::nve_from_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">temp_iname</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i6_glob_VAR</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::nve_from_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">temp_iname</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP18" class="function-link"><span class="function-syntax">NonlocalVariables::set_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i6_glob_VAR</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">i6_glob_VAR</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::temporary_from_nve</span><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable_emission</span><span class="plain-syntax"> </span><span class="identifier-syntax">nve</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i6_glob_VAR</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="identifier-syntax">nve</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i6_glob_VAR</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><span class="identifier-syntax">nve</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP18" class="function-link"><span class="function-syntax">NonlocalVariables::set_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i6_glob_VAR</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">i6_glob_VAR</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">formal_par_vars_made</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">formal_par_VAR</span><span class="plain-syntax">[8];</span>
|
|
<span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::temporary_formal</span><button class="popup" onclick="togglePopup('usagePopup35')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup35">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::temporary_formal</span></span>:<br/>Compile Invocations - <a href="25-ci.html#SP2_2_3_1_1">§2.2.3.1.1</a>, <a href="25-ci.html#SP2_2_3_3_1_1">§2.2.3.3.1.1</a>, <a href="25-ci.html#SP2_2_3_4_1_1">§2.2.3.4.1.1</a>, <a href="25-ci.html#SP2_2_3_3_1_2_1">§2.2.3.3.1.2.1</a><br/>Routines - <a href="26-rt.html#SP4_1_2">§4.1.2</a>, <a href="26-rt.html#SP4_1_4">§4.1.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">formal_par_vars_made</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><8; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">formal_par_VAR</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] = </span><a href="6-nv.html#SP6" class="function-link"><span class="function-syntax">NonlocalVariables::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP19" class="function-link"><span class="function-syntax">NonlocalVariables::formal_par</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">formal_par_VAR</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]-></span><span class="element-syntax">nlv_iname</span><span class="plain-syntax"> = </span><span class="identifier-syntax">iname</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">formal_par_VAR</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">], </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::nve_from_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::set_I6_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">formal_par_VAR</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">], </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><a href="6-nv.html#SP10" class="function-link"><span class="function-syntax">NonlocalVariables::nve_from_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">formal_par_vars_made</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> = </span><span class="identifier-syntax">formal_par_VAR</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::formal_par</span><button class="popup" onclick="togglePopup('usagePopup36')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup36">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::formal_par</span></span>:<br/>Compile Invocations - <a href="25-ci.html#SP2_2_3_1_1">§2.2.3.1.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">n</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">n</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">: </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">formal_par0_HL</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span><span class="plain-syntax">: </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">formal_par1_HL</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span><span class="plain-syntax">: </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">formal_par2_HL</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">3</span><span class="plain-syntax">: </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">formal_par3_HL</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">4</span><span class="plain-syntax">: </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">formal_par4_HL</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">5</span><span class="plain-syntax">: </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">formal_par5_HL</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">6</span><span class="plain-syntax">: </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">formal_par6_HL</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="constant-syntax">7</span><span class="plain-syntax">: </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="27-hr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">formal_par7_HL</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"bad formal par number"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP20" class="paragraph-anchor"></a><b>§20. </b>This is a curiosity, used to force the textual contents of a bibliographic
|
|
data variable (such as "story title") to be treated as text.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::treat_as_plain_text_word</span><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inf</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP14" class="function-link"><span class="function-syntax">NonlocalVariables::get_knowledge</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">POSITIVE_KNOWLEDGE_LOOP</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="constant-syntax">PROPERTY_INF</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="16-in.html#SP10" class="function-link"><span class="function-syntax">World::Inferences::get_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">) == </span><span class="identifier-syntax">P_variable_initial_value</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><a href="16-in.html#SP10" class="function-link"><span class="function-syntax">World::Inferences::set_property_value_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_text</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP21" class="paragraph-anchor"></a><b>§21. </b>"Constant" means that no change is permitted at run-time; "initialisable"
|
|
means that a value can be set by an assertion in the source text.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::make_constant</span><button class="popup" onclick="togglePopup('usagePopup37')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup37">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::make_constant</span></span>:<br/>Assert Propositions - <a href="12-ap.html#SP8_5_2">§8.5.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">bib</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no such var"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">constant_at_run_time</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">var_is_initialisable_anyway</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">var_is_bibliographic</span><span class="plain-syntax"> = </span><span class="identifier-syntax">bib</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::make_initalisable</span><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">var_is_initialisable_anyway</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::is_constant</span><button class="popup" onclick="togglePopup('usagePopup38')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup38">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::is_constant</span></span>:<br/>Constants and Descriptions - <a href="10-cad.html#SP3">§3</a>, <a href="10-cad.html#SP4">§4</a><br/>The Equality Relation Revisited - <a href="12-terr.html#SP4">§4</a><br/>Lvalues - <a href="14-lv.html#SP8">§8</a><br/>Compile Invocations Inline - <a href="25-cii.html#SP3_1_1_2">§3.1.1.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no such var"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">constant_at_run_time</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::must_be_constant</span><button class="popup" onclick="togglePopup('usagePopup39')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup39">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::must_be_constant</span></span>:<br/>The Equality Relation Revisited - <a href="12-terr.html#SP5_3">§5.3</a><br/>Compile Invocations Inline - <a href="25-cii.html#SP3_5_4_2">§3.5.4.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">constant_at_run_time</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_CantChangeConstants</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"this is a name for a value which never changes during the story"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"so it can't be altered with 'now'."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP22" class="paragraph-anchor"></a><b>§22. </b>Substitution is the process of replacing a constant variable with its value,
|
|
and leaving everything else alone.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">substitution_session_id</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::substitute_constants</span><button class="popup" onclick="togglePopup('usagePopup40')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup40">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::substitute_constants</span></span>:<br/><a href="6-nv.html#SP24">§24</a><br/>Assertions - <a href="5-ass.html#SP6_3_41_3">§6.3.41.3</a><br/>Property Knowledge - <a href="5-pk.html#SP4">§4</a><br/>Relation Knowledge - <a href="5-rk.html#SP2">§2</a><br/>Compiling from Specifications - <a href="14-cfs.html#SP5">§5</a><br/>List Constants - <a href="18-lc.html#SP7">§7</a><br/>Tables - <a href="19-tb.html#SP23_2">§23.2</a><br/>Compile Phrases - <a href="25-cp.html#SP4_3_5">§4.3.5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">depth</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">substitution_session_id</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">depth</span><span class="plain-syntax">++ > </span><span class="constant-syntax">20</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"ill-founded constants"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> = </span><a href="14-lv.html#SP8" class="function-link"><span class="function-syntax">Lvalues::get_nonlocal_variable_if_any</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">constant_at_run_time</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">substitution_marker</span><span class="plain-syntax"> == </span><span class="identifier-syntax">substitution_session_id</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-sq.html#SP3" class="function-link"><span class="function-syntax">Problems::quote_kind</span></a><span class="plain-syntax">(3, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_MeaningRecursive</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"The sentence %1 tells me that '%2', which should be %3 "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that varies, is to have an initial value which can't "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"be worked out without going round in circles."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">substitution_marker</span><span class="plain-syntax"> = </span><span class="identifier-syntax">substitution_session_id</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sspec</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP16" class="function-link"><span class="function-syntax">NonlocalVariables::get_initial_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Node::is</span><span class="plain-syntax">(</span><span class="identifier-syntax">sspec</span><span class="plain-syntax">, </span><span class="identifier-syntax">UNKNOWN_NT</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) { </span><span class="identifier-syntax">spec</span><span class="plain-syntax"> = </span><span class="identifier-syntax">sspec</span><span class="plain-syntax">; </span><span class="reserved-syntax">continue</span><span class="plain-syntax">; }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">spec</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP23" class="paragraph-anchor"></a><b>§23. </b>From the point of view of computer science, aliasing is a terrible thing.
|
|
This is the ability to tie the name of a variable to that of something
|
|
else, and is motivated by the existence of nouns in English which are
|
|
neither quite proper nor common; "the player" in Inform is an example.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="function-syntax">NonlocalVariables::get_alias</span><button class="popup" onclick="togglePopup('usagePopup41')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup41">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::get_alias</span></span>:<br/>Refine Parse Tree - <a href="5-rpt.html#SP4">§4</a><br/>Assert Propositions - <a href="12-ap.html#SP11">§11</a><br/>Tables - <a href="19-tb.html#SP21_4">§21.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP16" class="function-link"><span class="function-syntax">NonlocalVariables::get_initial_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vals</span><span class="plain-syntax"> = </span><a href="16-is.html#SP16" class="function-link"><span class="function-syntax">InferenceSubjects::from_specification</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">vals</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">vals</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">alias_to_infs</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::set_alias</span><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">alias_to_infs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">infs</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP24" class="paragraph-anchor"></a><b>§24. </b>The following routine compiles the correct initial value for the given
|
|
variable. If it has no known initial value, it is given the initial
|
|
value for its kind where possible: note that this may not be possible
|
|
if the source text says something like
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>Thickness is a kind of value. The carpet nap is a thickness that varies.</p>
|
|
</blockquote>
|
|
|
|
<p class="commentary">without specifying any thicknesses: the set of legal thickness values
|
|
is empty, so the carpet nap variable cannot be created in a way
|
|
which makes its kind safe. Hence the error messages.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::emit_initial_value</span><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> </span><span class="identifier-syntax">VH</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Holsters::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">INTER_DATA_VHMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP24" class="function-link"><span class="function-syntax">NonlocalVariables::compile_initial_value_vh</span></a><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">v1</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Holsters::unholster_pair</span><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, &</span><span class="identifier-syntax">v1</span><span class="plain-syntax">, &</span><span class="identifier-syntax">v2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="27-em.html#SP3" class="function-link"><span class="function-syntax">Emit::array_generic_entry</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">v1</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::emit_initial_value_as_val</span><button class="popup" onclick="togglePopup('usagePopup42')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup42">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::emit_initial_value_as_val</span></span>:<br/>Stacked Variables - <a href="21-sv.html#SP3_1">§3.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> </span><span class="identifier-syntax">VH</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Holsters::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">INTER_VAL_VHMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP24" class="function-link"><span class="function-syntax">NonlocalVariables::compile_initial_value_vh</span></a><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Holsters::to_val_mode</span><span class="plain-syntax">(</span><a href="27-em.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), &</span><span class="identifier-syntax">VH</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::seek_initial_value</span><button class="popup" onclick="togglePopup('usagePopup43')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup43">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::seek_initial_value</span></span>:<br/><a href="6-nv.html#SP15">§15</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> *</span><span class="identifier-syntax">v1</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> *</span><span class="identifier-syntax">v2</span><span class="plain-syntax">, </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">ival_emission</span><span class="plain-syntax"> </span><span class="identifier-syntax">IE</span><span class="plain-syntax"> = </span><a href="27-em.html#SP4" class="function-link"><span class="function-syntax">Emit::begin_ival_emission</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP24" class="function-link"><span class="function-syntax">NonlocalVariables::compile_initial_value_vh</span></a><span class="plain-syntax">(</span><a href="27-em.html#SP4" class="function-link"><span class="function-syntax">Emit::ival_holster</span></a><span class="plain-syntax">(&</span><span class="identifier-syntax">IE</span><span class="plain-syntax">), </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="27-em.html#SP4" class="function-link"><span class="function-syntax">Emit::end_ival_emission</span></a><span class="plain-syntax">(&</span><span class="identifier-syntax">IE</span><span class="plain-syntax">, </span><span class="identifier-syntax">v1</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::compile_initial_value_vh</span><span class="plain-syntax">(</span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val</span><span class="plain-syntax"> =</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP22" class="function-link"><span class="function-syntax">NonlocalVariables::substitute_constants</span></a><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP16" class="function-link"><span class="function-syntax">NonlocalVariables::get_initial_value</span></a><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Node::is</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">, </span><span class="identifier-syntax">UNKNOWN_NT</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_created_at</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-nv.html#SP24_1" class="named-paragraph-link"><span class="named-paragraph">Initialise with the default value of its kind</span><span class="named-paragraph-number">24.1</span></a></span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><a href="6-nv.html#SP16" class="function-link"><span class="function-syntax">NonlocalVariables::origin_of_initial_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="14-lv.html#SP7" class="function-link"><span class="function-syntax">Lvalues::get_storage_form</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">) == </span><span class="constant-syntax">NONLOCAL_VARIABLE_NT</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-nv.html#SP24_2" class="named-paragraph-link"><span class="named-paragraph">Issue a problem for one variable set equal to another</span><span class="named-paragraph-number">24.2</span></a></span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><a href="14-cfs.html#SP8" class="function-link"><span class="function-syntax">Specifications::Compiler::compile_constant_to_kind_vh</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP24_1" class="paragraph-anchor"></a><b>§24.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Initialise with the default value of its kind</span><span class="named-paragraph-number">24.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="13-rsfk.html#SP5" class="function-link"><span class="function-syntax">Kinds::RunTime::compile_default_value_vh</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">, </span><span class="string-syntax">"variable"</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">var_is_allowed_to_be_zero</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Holsters::holster_pair</span><span class="plain-syntax">(</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">LITERAL_IVAL</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Kinds::Behaviour::get_name</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_EmptyDataType</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"I am unable to put any value into the variable '%1', because "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"%2 is a kind of value with no actual values."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="6-nv.html#SP24">§24</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP24_2" class="paragraph-anchor"></a><b>§24.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Issue a problem for one variable set equal to another</span><span class="named-paragraph-number">24.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">the_other</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::get_constant_nonlocal_variable</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">the_other</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"Tried to compile initial value of variable as null variable"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">the_other</span><span class="plain-syntax"> == </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-sq.html#SP3" class="function-link"><span class="function-syntax">Problems::quote_kind</span></a><span class="plain-syntax">(3, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_InitialiseQ2</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"The sentence %1 tells me that '%2', which should be %3 "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that varies, is to have an initial value equal to itself - "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"this is such an odd thing to say that I think I must have "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"misunderstood."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-sq.html#SP3" class="function-link"><span class="function-syntax">Problems::quote_kind</span></a><span class="plain-syntax">(3, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(4, </span><span class="identifier-syntax">the_other</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-sq.html#SP3" class="function-link"><span class="function-syntax">Problems::quote_kind</span></a><span class="plain-syntax">(5, </span><span class="identifier-syntax">the_other</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_InitialiseQ1</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"The sentence %1 tells me that '%2', which should be %3 "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that varies, is to have an initial value equal to '%4', "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"which in turn is %5 that varies. At the start of play, "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"variable values have to be set equal to definite constants, "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"so this is not allowed."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="6-nv.html#SP24">§24</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP25" class="paragraph-anchor"></a><b>§25. </b>The index of all the global variables doesn't actually include all of them,
|
|
because there are "K understood" variables for every kind which can be
|
|
understood, and a list of those would be tediously repetitive — it would
|
|
duplicate most of the list of base kinds. So the index shows just one such
|
|
variable. Inform recognises these variables by parsing their names against
|
|
the following:
|
|
</p>
|
|
|
|
<pre class="Preform-displayed-code all-displayed-code code-font">
|
|
<span class="Preform-function-syntax"><value-understood-variable-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
|
|
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><k-kind></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">understood</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP26" class="paragraph-anchor"></a><b>§26. </b>And here is the indexing code:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::index_all</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">heading</span><span class="plain-syntax"> *</span><span class="identifier-syntax">definition_area</span><span class="plain-syntax">, *</span><span class="identifier-syntax">current_area</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Index::anchor</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"NAMES"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">understood_note_given</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">) >= </span><span class="constant-syntax">0</span><span class="plain-syntax">) && (</span><a href="6-nv.html#SP17" class="function-link"><span class="function-syntax">NonlocalVariables::is_global</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">))) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="function-syntax"><value-understood-variable-name>(nlv-></span><span class="element-syntax">name</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-nv.html#SP26_1" class="named-paragraph-link"><span class="named-paragraph">Index a K understood variable</span><span class="named-paragraph-number">26.1</span></a></span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-nv.html#SP26_2" class="named-paragraph-link"><span class="named-paragraph">Index a regular variable</span><span class="named-paragraph-number">26.2</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP26_1" class="paragraph-anchor"></a><b>§26.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Index a K understood variable</span><span class="named-paragraph-number">26.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">understood_note_given</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">understood_note_given</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"<i>kind</i> understood - <i>value</i>"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_TAG</span><span class="plain-syntax">(</span><span class="string-syntax">"br"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="6-nv.html#SP26">§26</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP26_2" class="paragraph-anchor"></a><b>§26.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Index a regular variable</span><span class="named-paragraph-number">26.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">definition_area</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Headings::of_wording</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Headings::indexed</span><span class="plain-syntax">(</span><span class="identifier-syntax">definition_area</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">continue</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">definition_area</span><span class="plain-syntax"> != </span><span class="identifier-syntax">current_area</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Headings::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">definition_area</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) </span><a href="22-pi.html#SP3" class="function-link"><span class="function-syntax">Phrases::Index::index_definition_area</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">current_area</span><span class="plain-syntax"> = </span><span class="identifier-syntax">definition_area</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="6-nv.html#SP27" class="function-link"><span class="function-syntax">NonlocalVariables::index_single</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_TAG</span><span class="plain-syntax">(</span><span class="string-syntax">"br"</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="6-nv.html#SP26">§26</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP27" class="paragraph-anchor"></a><b>§27. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">NonlocalVariables::index_single</span><button class="popup" onclick="togglePopup('usagePopup44')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup44">Usage of <span class="code-font"><span class="function-syntax">NonlocalVariables::index_single</span></span>:<br/><a href="6-nv.html#SP26_2">§26.2</a><br/>Stacked Variables - <a href="21-sv.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%+W"</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Index::link</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">name</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">var_documentation_symbol</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">ixt</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">ixt</span><span class="plain-syntax">, </span><span class="string-syntax">"%+W"</span><span class="plain-syntax">, </span><span class="identifier-syntax">Wordings::one_word</span><span class="plain-syntax">(</span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">var_documentation_symbol</span><span class="plain-syntax">)));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Index::DocReferences::link</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">ixt</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">ixt</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" - <i>"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Kinds::Textual::write</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="element-syntax">nlv_kind</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"</i>"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
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