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<!--Weave of 'Compile Atoms' generated by Inweb-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7</a></li><li><a href="index.html">imperative</a></li><li><a href="index.html#5">Chapter 5: Compiling Propositions</a></li><li><b>Compile Atoms</b></li></ul></div>
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<p class="purpose">In this section, given an atom of a proposition we compile I6 code as required for any of three possible outcomes: (i) to test whether it is true, (ii) to make it henceforth true, or (iii) to make it henceforth false.</p>
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<ul class="toc"><li><a href="5-ca.html#SP3_1">§3.1. Stage 1</a></li><li><a href="5-ca.html#SP3_2">§3.2. Stage 2</a></li><li><a href="5-ca.html#SP4">§4. Constructing the schema</a></li><li><a href="5-ca.html#SP6">§6. An unannotated one</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>The compilation method is to look at the atom, work out a suitable I6
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schema involving code to be applied to the one or two terms attaching to
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the atom, and then expand this. In some circumstances, the process of
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finding the schema will reveal that we need to apply it to different terms
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from those originally found in the atom, however, so we also need to keep
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track of that; and also of whether a condition is being regarded
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negatively.
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</p>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>For its internal purposes, Inform is sometimes able to compile atoms which
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wouldn't be allowed in a typical use of "now" from the source text; so it
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can suppress the following problem messages:
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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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">suppress_C14ActionVarsPastTense</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</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>So, then:
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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">Atoms::Compile::emit</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">Atoms::Compile::emit</span></span>:<br/>Deciding to Defer - <a href="5-dtd.html#SP10">§10</a><br/>Compile Deferred Propositions - <a href="5-cdp.html#SP2_1_6_1_2_3_2">§2.1.6.1.2.3.2</a>, <a href="5-cdp.html#SP2_1_6_1_2_3_4">§2.1.6.1.2.3.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">task</span><span class="plain-syntax">, </span><span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pl</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">with_semicolon</span><span class="plain-syntax">) {</span>
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<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>
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<span class="plain-syntax"> </span><a href="5-ca.html#SP3" class="function-link"><span class="function-syntax">Atoms::Compile::compile</span></a><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">task</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</span><span class="plain-syntax">, </span><span class="identifier-syntax">with_semicolon</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">Atoms::Compile::compile</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">Atoms::Compile::compile</span></span>:<br/>Deciding to Defer - <a href="5-dtd.html#SP7">§7</a></span></button><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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">task</span><span class="plain-syntax">, </span><span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pl</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">with_semicolon</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">i6_schema</span><span class="plain-syntax"> </span><span class="identifier-syntax">sch</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">annotated_i6_schema</span><span class="plain-syntax"> </span><span class="identifier-syntax">asch</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">task</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">TEST_ATOM_TASK:</span><span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">PREDICATE_CALCULUS_WORKINGS</span><span class="plain-syntax">, </span><span class="string-syntax">"Compiling condition: $o\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">NOW_ATOM_TRUE_TASK:</span><span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">PREDICATE_CALCULUS_WORKINGS</span><span class="plain-syntax">, </span><span class="string-syntax">"Compiling 'now': $o\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">NOW_ATOM_FALSE_TASK:</span><span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">PREDICATE_CALCULUS_WORKINGS</span><span class="plain-syntax">, </span><span class="string-syntax">"Compiling 'now' false: $o\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">default:</span><span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"unknown compile task"</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="named-paragraph-container code-font"><a href="5-ca.html#SP3_1" class="named-paragraph-link"><span class="named-paragraph">Stage 1: make an annotated schema from the atom</span><span class="named-paragraph-number">3.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-ca.html#SP3_2" class="named-paragraph-link"><span class="named-paragraph">Stage 2: expand that schema to the output stream</span><span class="named-paragraph-number">3.2</span></a></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="SP3_1" class="paragraph-anchor"></a><b>§3.1. Stage 1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Stage 1: make an annotated schema from the atom</span><span class="named-paragraph-number">3.1</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">asch</span><span class="plain-syntax"> = </span><a href="5-ca.html#SP4" class="function-link"><span class="function-syntax">Atoms::Compile::i6_schema_of_atom</span></a><span class="plain-syntax">(&</span><span class="identifier-syntax">sch</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</span><span class="plain-syntax">, </span><span class="identifier-syntax">task</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">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">schema</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">problem_count</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><span class="named-paragraph-container code-font"><a href="5-ca.html#SP3_1_1" class="named-paragraph-link"><span class="named-paragraph">Issue a fallback problem message, since the schema-maker evidently didn't</span><span class="named-paragraph-number">3.1.1</span></a></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>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-ca.html#SP3_1_2" class="named-paragraph-link"><span class="named-paragraph">Reject all discussion of the action variables in the past tense</span><span class="named-paragraph-number">3.1.2</span></a></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="5-ca.html#SP3">§3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3_1_1" class="paragraph-anchor"></a><b>§3.1.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Issue a fallback problem message, since the schema-maker evidently didn't</span><span class="named-paragraph-number">3.1.1</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">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Failed on task: $o\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</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">task</span><span class="plain-syntax"> == </span><span class="identifier-syntax">TEST_ATOM_TASK</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><span class="identifier-syntax">Task::syntax_tree</span><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>
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<span class="plain-syntax"> </span><span class="string-syntax">"this is not a condition I am able to test"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"or at any rate not during play."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_CantForceRelation</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"this is not something I can make true with 'now'"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"because it is too vague about the underlying cause which would "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"need to be arranged."</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="5-ca.html#SP3_1">§3.1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3_1_2" class="paragraph-anchor"></a><b>§3.1.2. </b>This is in the user's own best interest.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Reject all discussion of the action variables in the past tense</span><span class="named-paragraph-number">3.1.2</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="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">involves_action_variables</span><span class="plain-syntax">) &&</span>
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<span class="plain-syntax"> (</span><a href="4-sf.html#SP11" class="function-link"><span class="function-syntax">Frames::used_for_past_tense</span></a><span class="plain-syntax">()) &&</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">suppress_C14ActionVarsPastTense</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">problem_count</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><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_ActionVarsPastTense</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"it is misleading to talk about the noun, the second noun "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"or the person asked to do something in past tenses"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"because in the past, those were different things and "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"people, or may have been nothing at all. Writing "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"'if the noun has been unlocked' tends not to do what we "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"might hope because the value of 'noun' changes every turn. "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"So such conditions are not allowed, although to get around "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"this we can instead write 'if we have unlocked the noun', "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"which uses a special mechanism to remember everything which "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"has happened to every object."</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>
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<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="5-ca.html#SP3_1">§3.1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3_2" class="paragraph-anchor"></a><b>§3.2. Stage 2. </b>A valid I6 condition has to be bracketed, so we surround the output with
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brackets if testing; and a valid I6 statement has to end with a semicolon,
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so we terminate with that if making true or false.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Stage 2: expand that schema to the output stream</span><span class="named-paragraph-number">3.2</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">negate_schema</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><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">NOT_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><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">());</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><a href="5-efs.html#SP1" class="function-link"><span class="function-syntax">EmitSchemas::emit_expand_from_terms</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">schema</span><span class="plain-syntax">, &(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">pt0</span><span class="plain-syntax">), &(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">pt1</span><span class="plain-syntax">), </span><span class="identifier-syntax">with_semicolon</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">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">negate_schema</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><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">());</span>
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<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="5-ca.html#SP3">§3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. Constructing the schema. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">annotated_i6_schema</span><span class="plain-syntax"> </span><span class="function-syntax">Atoms::Compile::i6_schema_of_atom</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">Atoms::Compile::i6_schema_of_atom</span></span>:<br/><a href="5-ca.html#SP3_1">§3.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch</span><span class="plain-syntax">, </span><span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pl</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">task</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">annotated_i6_schema</span><span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">sch</span><span class="plain-syntax">, </span><span class="string-syntax">" "</span><span class="plain-syntax">); </span><span class="comment-syntax"> a non-NULL return in case problems occur</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">schema</span><span class="plain-syntax"> = </span><span class="identifier-syntax">sch</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">negate_schema</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">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">pt0</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0]; </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">pt1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[1];</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">involves_action_variables</span><span class="plain-syntax"> = </span><a href="5-ca.html#SP5" class="function-link"><span class="function-syntax">Atoms::Compile::atom_involves_action_variables</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pl</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">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">element</span><span class="plain-syntax"> == </span><span class="identifier-syntax">PREDICATE_ATOM</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">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">arity</span><span class="plain-syntax">) {</span>
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<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="named-paragraph-container code-font"><a href="5-ca.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Make an annotated schema for a unary predicate</span><span class="named-paragraph-number">4.1</span></a></span><span class="plain-syntax">;</span>
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|
<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="named-paragraph-container code-font"><a href="5-ca.html#SP4_2" class="named-paragraph-link"><span class="named-paragraph">Make an annotated schema for a binary predicate</span><span class="named-paragraph-number">4.2</span></a></span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">schema</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="comment-syntax"> signal that the atom cannot be compiled simply</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP4_1" class="paragraph-anchor"></a><b>§4.1. </b>We hand over to the general UP apparatus for this.
|
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</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Make an annotated schema for a unary predicate</span><span class="named-paragraph-number">4.1</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">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0].</span><span class="identifier-syntax">constant</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0].</span><span class="identifier-syntax">term_checked_as_kind</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">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0].</span><span class="identifier-syntax">term_checked_as_kind</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Specifications::to_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0].</span><span class="identifier-syntax">constant</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">PREDICATE_CALCULUS_WORKINGS</span><span class="plain-syntax">, </span><span class="string-syntax">"Unary predicate: $o, on: %u\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0].</span><span class="identifier-syntax">term_checked_as_kind</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_unary_predicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">predicate</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">UnaryPredicateFamilies::get_schema</span><span class="plain-syntax">(</span><span class="identifier-syntax">task</span><span class="plain-syntax">, </span><span class="identifier-syntax">tr</span><span class="plain-syntax">, &</span><span class="identifier-syntax">asch</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0].</span><span class="identifier-syntax">term_checked_as_kind</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">asch</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-ca.html#SP4">§4</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4_2" class="paragraph-anchor"></a><b>§4.2. </b>Delegation is similarly the art of compiling a BP:
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Make an annotated schema for a binary predicate</span><span class="named-paragraph-number">4.2</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">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_binary_predicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">predicate</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp_to_assert</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-ca.html#SP4_2_1" class="named-paragraph-link"><span class="named-paragraph">Undo any functional simplification of the relation</span><span class="named-paragraph-number">4.2.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">schema</span><span class="plain-syntax"> = </span><span class="identifier-syntax">BinaryPredicateFamilies::get_schema</span><span class="plain-syntax">(</span><span class="identifier-syntax">task</span><span class="plain-syntax">, </span><span class="identifier-syntax">bp_to_assert</span><span class="plain-syntax">, &</span><span class="identifier-syntax">asch</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">asch</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-ca.html#SP4">§4</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4_2_1" class="paragraph-anchor"></a><b>§4.2.1. </b>When a relation \(R(x, y)\) has been simplified to \(is(x, f_R(y))\)
|
|
or \(is(g_R(x), y)\), it can be tested but not asserted true or false;
|
|
we have to re-establish \(R(x, y)\) before we can proceed.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Undo any functional simplification of the relation</span><span class="named-paragraph-number">4.2.1</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">task</span><span class="plain-syntax"> != </span><span class="identifier-syntax">TEST_ATOM_TASK</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">bp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">R_equality</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">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0].</span><span class="identifier-syntax">function</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">bp_to_assert</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0].</span><span class="identifier-syntax">function</span><span class="plain-syntax">-></span><span class="identifier-syntax">bp</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">pt0</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0].</span><span class="identifier-syntax">function</span><span class="plain-syntax">-></span><span class="identifier-syntax">fn_of</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">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[1].</span><span class="identifier-syntax">function</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">bp_to_assert</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[1].</span><span class="identifier-syntax">function</span><span class="plain-syntax">-></span><span class="identifier-syntax">bp</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">pt1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</span><span class="plain-syntax">[1].</span><span class="identifier-syntax">function</span><span class="plain-syntax">-></span><span class="identifier-syntax">fn_of</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">bp_to_assert</span><span class="plain-syntax"> == </span><span class="identifier-syntax">R_equality</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">"contraction of predicate applied to equality"</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">bp_to_assert</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">bp_to_assert</span><span class="plain-syntax"> = </span><span class="identifier-syntax">bp</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-ca.html#SP4_2">§4.2</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Atoms::Compile::atom_involves_action_variables</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">Atoms::Compile::atom_involves_action_variables</span></span>:<br/><a href="5-ca.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pl</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">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="function-syntax"><pl-></span><span class="identifier-syntax">arity</span><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">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">operand</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Terms::constant_underlying</span><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">terms</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">RTActions::is_an_action_variable</span><span class="plain-syntax">(</span><span class="identifier-syntax">operand</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="identifier-syntax">endif</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="SP6" class="paragraph-anchor"></a><b>§6. An unannotated one. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">annotated_i6_schema</span><span class="plain-syntax"> </span><span class="function-syntax">Atoms::Compile::blank_asch</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">annotated_i6_schema</span><span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">schema</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Calculus::Schemas::new</span><span class="plain-syntax">(</span><span class="string-syntax">" "</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">negate_schema</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">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">pt0</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Terms::new_variable</span><span class="plain-syntax">(0);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">pt1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Terms::new_variable</span><span class="plain-syntax">(0);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">.</span><span class="identifier-syntax">involves_action_variables</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">asch</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<nav role="progress"><div class="progresscontainer">
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