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<!--Weave of 'Type Check Propositions' generated by Inweb-->
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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#11">Chapter 11: Predicate Calculus</a></li><li><b>Type Check Propositions</b></li></ul></div>
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<p class="purpose">Predicate calculus is a largely symbolic exercise, and its rules of working tend to assume that all predicates are meaningful for all terms: this means, for instance, that "if blue is 14" is likely to make a well-formed sentence in predicate calculus. In this section we reject such propositions on the grounds that they violate type-checking requirements on relations -- in this example, the equality relation.</p>
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<ul class="toc"><li><a href="11-tcp.html#SP3">§3. Problem reporting kit</a></li><li><a href="11-tcp.html#SP5">§5. Type-checking whole propositions</a></li><li><a href="11-tcp.html#SP5_1">§5.1. Finding kinds for variables</a></li><li><a href="11-tcp.html#SP5_5">§5.5. Type-checking enforced on predicate-like atoms</a></li><li><a href="11-tcp.html#SP6">§6. The kind of a term</a></li><li><a href="11-tcp.html#SP9">§9. Type-checking predicates</a></li><li><a href="11-tcp.html#SP11">§11. Two problem messages needed more than once</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>We can unambiguously find the kind of value of any constant \(C\), so if a
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proposition's terms are all constant then type-checking is easy. ${\it is}(4, <span class="extract"><span class="extract-syntax">score</span></span>)$
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good, ${\it is}(4, <span class="extract"><span class="extract-syntax">"fish"</span></span>)$ bad. The subtlety comes in interpreting
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\({\it is}(4, x)\), where \(x\) is a variable. Our calculus allows variables to
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range over many domains — numbers, texts, scenes, objects, and so on.
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So it turns out to be convenient to have a structure holding a choice of kinds
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of value for the contents of the variables; such structures exist temporarily
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on the stack while we work.
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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">variable_type_assignment</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">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">assigned_kinds</span><span class="plain-syntax">[26]; </span><span class="comment-syntax"> one for each of the 26 variables</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">variable_type_assignment</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure variable_type_assignment is private to this section.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>Another convenience is a sort of kit for preparing 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">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">tc_problem_kit</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">issue_error</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">ew_text</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">intention</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">log_to_I6_text</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">flag_problem</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure tc_problem_kit is accessed in 2/si, 12/ter, 12/qr, 15/cr and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. Problem reporting kit. </b>The caller to <span class="extract"><span class="extract-syntax">Calculus::Propositions::Checker::type_check</span></span> has to fill this form out first. Paperwork,
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what can you do, eh?
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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">tc_problem_kit</span><span class="plain-syntax"> </span><span class="function-syntax">Calculus::Propositions::Checker::tc_no_problem_reporting</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">Calculus::Propositions::Checker::tc_no_problem_reporting</span></span>:<br/><a href="11-tcp.html#SP4">§4</a><br/>Propositions - <a href="11-pr.html#SP34_1_1">§34.1.1</a><br/>Deciding to Defer - <a href="12-dtd.html#SP9">§9</a>, <a href="12-dtd.html#SP12">§12</a>, <a href="12-dtd.html#SP21">§21</a><br/>Descriptions - <a href="14-ds.html#SP3">§3</a>, <a href="14-ds.html#SP5">§5</a>, <a href="14-ds.html#SP8">§8</a>, <a href="14-ds.html#SP9">§9</a>, <a href="14-ds.html#SP10">§10</a><br/>Dash - <a href="14-ds2.html#SP18_4">§18.4</a><br/>Compile Phrases - <a href="25-cp.html#SP4_3_5_3">§4.3.5.3</a><br/>Internal Test Cases - <a href="26-itc.html#SP4_1">§4.1</a>, <a href="26-itc.html#SP6">§6</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">tc_problem_kit</span><span class="plain-syntax"> </span><span class="identifier-syntax">tck</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">tck</span><span class="plain-syntax">.</span><span class="element-syntax">issue_error</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">; </span><span class="identifier-syntax">tck</span><span class="plain-syntax">.</span><span class="identifier-syntax">ew_text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">; </span><span class="identifier-syntax">tck</span><span class="plain-syntax">.</span><span class="element-syntax">intention</span><span class="plain-syntax"> = </span><span class="string-syntax">"be silent checking"</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">tck</span><span class="plain-syntax">.</span><span class="element-syntax">log_to_I6_text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">; </span><span class="identifier-syntax">tck</span><span class="plain-syntax">.</span><span class="element-syntax">flag_problem</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">tck</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> </span><span class="function-syntax">Calculus::Propositions::Checker::tc_problem_reporting</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">Calculus::Propositions::Checker::tc_problem_reporting</span></span>:<br/>Assert Propositions - <a href="12-ap.html#SP8_3">§8.3</a><br/>Deciding to Defer - <a href="12-dtd.html#SP28">§28</a><br/>Dash - <a href="14-ds2.html#SP18_4">§18.4</a><br/>Measurement Adjectives - <a href="15-ma.html#SP12">§12</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="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">intent</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> </span><span class="identifier-syntax">tck</span><span class="plain-syntax"> = </span><a href="11-tcp.html#SP3" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::tc_no_problem_reporting</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">tck</span><span class="plain-syntax">.</span><span class="element-syntax">issue_error</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">; </span><span class="identifier-syntax">tck</span><span class="plain-syntax">.</span><span class="element-syntax">ew_text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">W</span><span class="plain-syntax">; </span><span class="identifier-syntax">tck</span><span class="plain-syntax">.</span><span class="element-syntax">intention</span><span class="plain-syntax"> = </span><span class="identifier-syntax">intent</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">tck</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>A version used only for the internal testing mode, when we print the outcome
|
|
into the debugging log, but diverted to an I6 string in the compiled code.
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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">tc_problem_kit</span><span class="plain-syntax"> </span><span class="function-syntax">Calculus::Propositions::Checker::tc_problem_logging</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">Calculus::Propositions::Checker::tc_problem_logging</span></span>:<br/>Internal Test Cases - <a href="26-itc.html#SP4_1">§4.1</a>, <a href="26-itc.html#SP6">§6</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">tc_problem_kit</span><span class="plain-syntax"> </span><span class="identifier-syntax">tck</span><span class="plain-syntax"> = </span><a href="11-tcp.html#SP3" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::tc_no_problem_reporting</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">tck</span><span class="plain-syntax">.</span><span class="element-syntax">intention</span><span class="plain-syntax"> = </span><span class="string-syntax">"be internal testing"</span><span class="plain-syntax">; </span><span class="identifier-syntax">tck</span><span class="plain-syntax">.</span><span class="element-syntax">log_to_I6_text</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">tck</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="SP5" class="paragraph-anchor"></a><b>§5. Type-checking whole propositions. </b>This section provides a single routine to the rest of Inform: <span class="extract"><span class="extract-syntax">Calculus::Propositions::Checker::type_check</span></span>.
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We determine the kinds for all variables, then work through the proposition,
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|
ensuring that every predicate-like atom has terms which match at least one
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possible reading of the meaning of the atom.
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</p>
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<p class="commentary">As usual in Inform, type-checking is not a passive process. If it can make
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sense of the proposition by changing it, it will do so.
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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="function-syntax">Calculus::Propositions::Checker::type_check</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">Calculus::Propositions::Checker::type_check</span></span>:<br/>Propositions - <a href="11-pr.html#SP34_1_1">§34.1.1</a><br/>Assert Propositions - <a href="12-ap.html#SP8_3">§8.3</a><br/>Deciding to Defer - <a href="12-dtd.html#SP9">§9</a>, <a href="12-dtd.html#SP12">§12</a>, <a href="12-dtd.html#SP21">§21</a>, <a href="12-dtd.html#SP28">§28</a><br/>Descriptions - <a href="14-ds.html#SP3">§3</a>, <a href="14-ds.html#SP5">§5</a>, <a href="14-ds.html#SP8">§8</a>, <a href="14-ds.html#SP9">§9</a>, <a href="14-ds.html#SP10">§10</a><br/>Dash - <a href="14-ds2.html#SP18_4">§18.4</a><br/>Measurement Adjectives - <a href="15-ma.html#SP12">§12</a><br/>Compile Phrases - <a href="25-cp.html#SP4_3_5_3">§4.3.5.3</a><br/>Internal Test Cases - <a href="26-itc.html#SP4_1">§4.1</a>, <a href="26-itc.html#SP6">§6</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prop</span><span class="plain-syntax">, </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> </span><span class="identifier-syntax">tck_s</span><span class="plain-syntax">) {</span>
|
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<span class="plain-syntax"> </span><span class="identifier-syntax">TRAVERSE_VARIABLE</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">variable_type_assignment</span><span class="plain-syntax"> </span><span class="identifier-syntax">vta</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tck</span><span class="plain-syntax"> = &</span><span class="identifier-syntax">tck_s</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">MATCHING</span><span class="plain-syntax">, </span><span class="string-syntax">"Type-checking proposition: $D\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">prop</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">j</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">prop</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">ALWAYS_MATCH</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="11-bas.html#SP4" class="function-link"><span class="function-syntax">Calculus::Variables::is_well_formed</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prop</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">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"type-checking malformed proposition"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_1" class="named-paragraph-link"><span class="named-paragraph">First make sure any constants in the proposition have themselves been typechecked</span><span class="named-paragraph-number">5.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">j</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">j</span><span class="plain-syntax"><26; </span><span class="identifier-syntax">j</span><span class="plain-syntax">++) </span><span class="identifier-syntax">vta</span><span class="plain-syntax">.</span><span class="element-syntax">assigned_kinds</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</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="named-paragraph-container code-font"><a href="11-tcp.html#SP5_2" class="named-paragraph-link"><span class="named-paragraph">Look at KIND atoms to see what kinds of value are asserted for the variables</span><span class="named-paragraph-number">5.2</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_3" class="named-paragraph-link"><span class="named-paragraph">Look at KIND atoms to reject unarticled shockers</span><span class="named-paragraph-number">5.3</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_4" class="named-paragraph-link"><span class="named-paragraph">Assume any still-unfathomable variables represent objects</span><span class="named-paragraph-number">5.4</span></a></span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TRAVERSE_PROPOSITION</span><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">, </span><span class="identifier-syntax">prop</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">j</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">j</span><span class="function-syntax"><pl-></span><span class="identifier-syntax">arity</span><span class="plain-syntax">; </span><span class="identifier-syntax">j</span><span class="plain-syntax">++) </span><a href="11-tcp.html#SP6" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">]), &</span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">flag_problem</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NEVER_MATCH</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">element</span><span class="plain-syntax"> == </span><span class="identifier-syntax">KIND_ATOM</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_5" class="named-paragraph-link"><span class="named-paragraph">A KIND atom is not allowed if it can be proved to be false</span><span class="named-paragraph-number">5.5</span></a></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">element</span><span class="plain-syntax"> == </span><span class="identifier-syntax">PREDICATE_ATOM</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><span class="constant-syntax">2</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_7" class="named-paragraph-link"><span class="named-paragraph">A binary predicate is required to apply to terms of the right kinds</span><span class="named-paragraph-number">5.7</span></a></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">element</span><span class="plain-syntax"> == </span><span class="identifier-syntax">PREDICATE_ATOM</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><span class="constant-syntax">1</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_6" class="named-paragraph-link"><span class="named-paragraph">A unary predicate is required to have an interpretation matching the kind of its term</span><span class="named-paragraph-number">5.6</span></a></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">element</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EVERYWHERE_ATOM</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_9" class="named-paragraph-link"><span class="named-paragraph">An EVERYWHERE atom needs its term to be an object</span><span class="named-paragraph-number">5.9</span></a></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">element</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NOWHERE_ATOM</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_10" class="named-paragraph-link"><span class="named-paragraph">A NOWHERE atom needs its term to be an object</span><span class="named-paragraph-number">5.10</span></a></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">element</span><span class="plain-syntax"> == </span><span class="identifier-syntax">ISAKIND_ATOM</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_8" class="named-paragraph-link"><span class="named-paragraph">An ISAKIND atom needs its term to be an object</span><span class="named-paragraph-number">5.8</span></a></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">element</span><span class="plain-syntax"> == </span><span class="identifier-syntax">HERE_ATOM</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_11" class="named-paragraph-link"><span class="named-paragraph">A HERE atom needs its term to be an object</span><span class="named-paragraph-number">5.11</span></a></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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_12" class="named-paragraph-link"><span class="named-paragraph">Show the variable assignment in the debugging log</span><span class="named-paragraph-number">5.12</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">ALWAYS_MATCH</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5_1" class="paragraph-anchor"></a><b>§5.1. Finding kinds for variables. </b>Every specification compiled by Inform has to pass through type-checking.
|
|
That includes the ones which occur as constants inside propositions, and this is
|
|
where.
|
|
</p>
|
|
|
|
<p class="commentary">The presence of an <span class="extract"><span class="extract-syntax">UNKNOWN_NT</span></span> constant indicates something which failed to be
|
|
recognised by the S-parser. That shouldn't happen, but we allow for it so that
|
|
we can recover from an already reported problem.
|
|
</p>
|
|
|
|
<p class="commentary">Perhaps surprisingly, we don't reject generic constants: this is so that
|
|
sentences like
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>A thing usually weighs 10kg.</p>
|
|
</blockquote>
|
|
|
|
<p class="commentary">...can work — here the generic constant for "thing" is treated as a noun,
|
|
since it can be the subject of inferences all by itself. So it can legitimately
|
|
be a term in a proposition.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">First make sure any constants in the proposition have themselves been typechecked</span><span class="named-paragraph-number">5.1</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">TRAVERSE_PROPOSITION</span><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">, </span><span class="identifier-syntax">prop</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">j</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">j</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">j</span><span class="function-syntax"><pl-></span><span class="identifier-syntax">arity</span><span class="plain-syntax">; </span><span class="identifier-syntax">j</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">spec</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Calculus::Terms::constant_underlying</span><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</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">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">rv</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEVER_MATCH</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">spec</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">tck</span><span class="plain-syntax">-></span><span class="element-syntax">issue_error</span><span class="plain-syntax">) </span><span class="identifier-syntax">rv</span><span class="plain-syntax"> = </span><a href="14-ds2.html#SP8" class="function-link"><span class="function-syntax">Dash::check_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec</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">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">rv</span><span class="plain-syntax"> = </span><a href="14-ds2.html#SP8" class="function-link"><span class="function-syntax">Dash::check_value_silently</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">spec</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</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">rv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NEVER_MATCH</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_1_1" class="named-paragraph-link"><span class="named-paragraph">Recover from problem in S-parser by not issuing problem</span><span class="named-paragraph-number">5.1.1</span></a></span><span class="plain-syntax">;</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="11-tcp.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_2" class="paragraph-anchor"></a><b>§5.2. </b>If the proposition contains contradictory <span class="extract"><span class="extract-syntax">KIND</span></span> atoms, it automatically fails
|
|
type-checking, even if there is no implication that both apply at once. This
|
|
throws out, for instance:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> 1. a scene which is not a number</span>
|
|
<span class="plain-syntax"> [ scene(x) & NOT[ number(x) NOT] ]</span>
|
|
<span class="plain-syntax"> Failed: proposition would not type-check</span>
|
|
<span class="plain-syntax"> x is both scene and number</span>
|
|
</pre>
|
|
<p class="commentary">It could be argued that all scenes ought to pass this proposition, but we will
|
|
treat it as a piece of nonsense, like "if Wednesday is not custard".
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Look at KIND atoms to see what kinds of value are asserted for the variables</span><span class="named-paragraph-number">5.2</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">TRAVERSE_PROPOSITION</span><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">, </span><span class="identifier-syntax">prop</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">element</span><span class="plain-syntax"> == </span><span class="identifier-syntax">KIND_ATOM</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">v</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0].</span><span class="identifier-syntax">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">v</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">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">new_kind</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">assert_kind</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">Kinds::Behaviour::is_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">new_kind</span><span class="plain-syntax">)) </span><span class="identifier-syntax">new_kind</span><span class="plain-syntax"> = </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">old_kind</span><span class="plain-syntax"> = </span><span class="identifier-syntax">vta</span><span class="plain-syntax">.</span><span class="element-syntax">assigned_kinds</span><span class="plain-syntax">[</span><span class="identifier-syntax">v</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">old_kind</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">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">old_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">new_kind</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</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">tck</span><span class="plain-syntax">-></span><span class="identifier-syntax">log_to_I6_text</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">"%c is both %u and %u\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pcalc_vars</span><span class="plain-syntax">[</span><span class="identifier-syntax">v</span><span class="plain-syntax">], </span><span class="identifier-syntax">old_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">new_kind</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="11-tcp.html#SP11" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::issue_kind_typecheck_error</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">old_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">new_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</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">NEVER_MATCH</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">Kinds::Behaviour::definite</span><span class="plain-syntax">(</span><span class="identifier-syntax">new_kind</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="identifier-syntax">new_kind</span><span class="plain-syntax"> = </span><span class="identifier-syntax">old_kind</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">vta</span><span class="plain-syntax">.</span><span class="element-syntax">assigned_kinds</span><span class="plain-syntax">[</span><span class="identifier-syntax">v</span><span class="plain-syntax">] = </span><span class="identifier-syntax">new_kind</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="11-tcp.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_3" class="paragraph-anchor"></a><b>§5.3. </b>The following is arguably a problem which should have been thrown earlier,
|
|
but it's a very subtle one, and we want to use it only when everything else
|
|
(more or less) has worked.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Look at KIND atoms to reject unarticled shockers</span><span class="named-paragraph-number">5.3</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">TRAVERSE_PROPOSITION</span><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">, </span><span class="identifier-syntax">prop</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">element</span><span class="plain-syntax"> == </span><span class="identifier-syntax">KIND_ATOM</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">unarticled</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</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">"Rejecting as unarticled\n"</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">issue_error</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NEVER_MATCH</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">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_BareKindVariable</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 use a kind variable by its letter "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"alone in the context of a noun, which Inform doesn't allow. "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"It's fine to say 'if the noun is a K', for example, but "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"not 'if K is number'. By putting 'a' or 'an' in front of the "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"kind variable, you make clear that I'm supposed to perform "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"matching against a description."</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">NEVER_MATCH</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_4" class="paragraph-anchor"></a><b>§5.4. </b>It's possible for a proposition to specify nothing about the kind of a
|
|
variable (usually a free one). If so, it's assumed to be an object. For
|
|
instance, if we define
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>Definition: a container is empty if the number of things in it is 0.</p>
|
|
</blockquote>
|
|
|
|
<p class="commentary">then we find that, say:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> 1. empty which is empty</span>
|
|
<span class="plain-syntax"> [ 'empty'(x) & 'empty'(x) ]</span>
|
|
<span class="plain-syntax"> x (free) - object.</span>
|
|
</pre>
|
|
<p class="commentary">though in fact it would also have been viable for \(x\) to be a rulebook, a list,
|
|
or various other kinds of value.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Assume any still-unfathomable variables represent objects</span><span class="named-paragraph-number">5.4</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">j</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">j</span><span class="plain-syntax"><26; </span><span class="identifier-syntax">j</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">vta</span><span class="plain-syntax">.</span><span class="element-syntax">assigned_kinds</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</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">vta</span><span class="plain-syntax">.</span><span class="element-syntax">assigned_kinds</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">] = </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_1_1" class="paragraph-anchor"></a><b>§5.1.1. </b>The following is really rather paranoid; it ought to be certain that a
|
|
problem message has already been issued, but just in case not...
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Recover from problem in S-parser by not issuing problem</span><span class="named-paragraph-number">5.1.1</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">problem_count</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Atom $o contains failed constant\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">issue_error</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NEVER_MATCH</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">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">spec</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 contain a value '%2' which I can't make "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"any sense of."</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="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Stare at this, then: $P\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">spec</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">NEVER_MATCH</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5_1">§5.1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_5" class="paragraph-anchor"></a><b>§5.5. Type-checking enforced on predicate-like atoms. </b>As with contradictory <span class="extract"><span class="extract-syntax">KIND</span></span> atoms applied to variables, we will reject any
|
|
<span class="extract"><span class="extract-syntax">KIND</span></span> atom applied to a constant if it necessarily fails — even when the
|
|
sense of the proposition is arguably correct. For example:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> 1. 100 is not a text</span>
|
|
<span class="plain-syntax"> [ NOT[ text('100') NOT] ]</span>
|
|
<span class="plain-syntax"> Failed: proposition would not type-check</span>
|
|
<span class="plain-syntax"> Term '100' is number not text</span>
|
|
</pre>
|
|
<p class="commentary">"100 is not a number" would pass, on the other hand. It is obviously false,
|
|
but not meaningless.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">A KIND atom is not allowed if it can be proved to be false</span><span class="named-paragraph-number">5.5</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">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="identifier-syntax">assert_kind</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">Kinds::Behaviour::is_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax">)) </span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax"> = </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax"> = </span><a href="11-tcp.html#SP6" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), &</span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</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">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</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">"Term $0 is %u not %u\n"</span><span class="plain-syntax">, &(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="11-tcp.html#SP11" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::issue_kind_typecheck_error</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</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">NEVER_MATCH</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_6" class="paragraph-anchor"></a><b>§5.6. </b>See below, of course.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">A unary predicate is required to have an interpretation matching the kind of its term</span><span class="named-paragraph-number">5.6</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="11-tcp.html#SP9" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::type_check_unary_predicate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">, &</span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Adjective $o cannot be applied\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</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">NEVER_MATCH</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_7" class="paragraph-anchor"></a><b>§5.7. </b>The BP case is interesting because it forgives a failure in one case: of
|
|
\({\it is}(t, C)\), where \(C\) is a constant representing a value of an enumerated
|
|
kind. Sentence conversion is actually quite good at distinguishing these cases
|
|
and can see the difference between "the bus is red" and "the fashionable hue
|
|
is red", but it is defeated by cases where adjectives representing values are
|
|
used about other values — "the Communist Rally is red", where "Communist
|
|
Rally" is a scene rather than an object, for instance. We first try requiring
|
|
<span class="extract"><span class="extract-syntax">Rally</span></span> to be a colour: when that fails, we see if the atom ${\it red}(<span class="extract"><span class="extract-syntax">Rally</span></span>)$
|
|
would work instead. If it would, we make the change within the proposition.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">A binary predicate is required to apply to terms of the right kinds</span><span class="named-paragraph-number">5.7</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">BinaryPredicates::is_the_wrong_way_round</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">)) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"BP wrong way round"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="11-tcp.html#SP10" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::type_check_binary_predicate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">, &</span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</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</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">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">alt</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Calculus::Terms::noun_to_adj_conversion</span><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[1]);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">alt</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> </span><span class="identifier-syntax">test_unary</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">test_unary</span><span class="plain-syntax">.</span><span class="identifier-syntax">arity</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">test_unary</span><span class="plain-syntax">.</span><span class="identifier-syntax">predicate</span><span class="plain-syntax"> = </span><span class="identifier-syntax">STORE_POINTER_unary_predicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">alt</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="11-tcp.html#SP9" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::type_check_unary_predicate</span></a><span class="plain-syntax">(&</span><span class="identifier-syntax">test_unary</span><span class="plain-syntax">, &</span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP5_7_1" class="named-paragraph-link"><span class="named-paragraph">The BP fails type-checking</span><span class="named-paragraph-number">5.7.1</span></a></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">arity</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</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">predicate</span><span class="plain-syntax"> = </span><span class="identifier-syntax">STORE_POINTER_unary_predicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">alt</span><span class="plain-syntax">);</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="11-tcp.html#SP5_7_1" class="named-paragraph-link"><span class="named-paragraph">The BP fails type-checking</span><span class="named-paragraph-number">5.7.1</span></a></span><span class="plain-syntax">;</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="11-tcp.html#SP5_7_1" class="named-paragraph-link"><span class="named-paragraph">The BP fails type-checking</span><span class="named-paragraph-number">5.7.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_7_1" class="paragraph-anchor"></a><b>§5.7.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">The BP fails type-checking</span><span class="named-paragraph-number">5.7.1</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"BP $o cannot be applied\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pl</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">NEVER_MATCH</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5_7">§5.7</a> (three times).</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_8" class="paragraph-anchor"></a><b>§5.8. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">An ISAKIND atom needs its term to be an object</span><span class="named-paragraph-number">5.8</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax"> = </span><a href="11-tcp.html#SP6" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), &</span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</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">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</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">"ISAKIND atom misapplied"</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5">§5</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP5_9" class="paragraph-anchor"></a><b>§5.9. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">An EVERYWHERE atom needs its term to be an object</span><span class="named-paragraph-number">5.9</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">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax"> = </span><a href="11-tcp.html#SP6" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), &</span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</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">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</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">"Term $0 is %u not an object\n"</span><span class="plain-syntax">, &(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">actually_find</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">(4, </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-si.html#SP6" class="function-link"><span class="function-syntax">StandardProblems::tcp_problem</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_EverywhereMisapplied</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say that a value - specifically, %4 - is everywhere. "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"To Inform, everywhere means 'in every room', and only objects "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"can be everywhere - in fact not even all of those, as it's a "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"privilege reserved for backdrops. (For instance, 'The sky is a "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"backdrop. The sky is everywhere.' is allowed.)"</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">NEVER_MATCH</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5">§5</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP5_10" class="paragraph-anchor"></a><b>§5.10. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">A NOWHERE atom needs its term to be an object</span><span class="named-paragraph-number">5.10</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">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax"> = </span><a href="11-tcp.html#SP6" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), &</span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</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">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</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">"Term $0 is %u not an object\n"</span><span class="plain-syntax">, &(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">actually_find</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">(4, </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-si.html#SP6" class="function-link"><span class="function-syntax">StandardProblems::tcp_problem</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_NowhereMisapplied</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say that a value - specifically, %4 - is nowhere. "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"To Inform, nowhere means 'in no room', and only things can be "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"nowhere. (For instance, 'Godot is nowhere.' is allowed - it means "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"Godot exists, but is not initially part of the drama.)"</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">NEVER_MATCH</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5">§5</a>.</li></ul>
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|
<p class="commentary firstcommentary"><a id="SP5_11" class="paragraph-anchor"></a><b>§5.11. </b>It seems to be true that the A-parser never generates propositions which
|
|
apply <span class="extract"><span class="extract-syntax">HERE</span></span> incorrectly, but just in case:
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">A HERE atom needs its term to be an object</span><span class="named-paragraph-number">5.11</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">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax"> = </span><a href="11-tcp.html#SP6" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), &</span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</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">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</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">"Term $0 is %u not an object\n"</span><span class="plain-syntax">, &(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">actually_find</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">(4, </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-si.html#SP6" class="function-link"><span class="function-syntax">StandardProblems::tcp_problem</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="identifier-syntax">tck</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say that a value - specifically, %4 - is here. "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"To Inform, here means 'in the room we're talking about', so only "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"objects can be 'here'."</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">NEVER_MATCH</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_12" class="paragraph-anchor"></a><b>§5.12. </b>Not so much for the debugging log as for the internal test, in fact, which
|
|
prints the log to an I6 string. This is the type-checking report in the case
|
|
of success.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Show the variable assignment in the debugging log</span><span class="named-paragraph-number">5.12</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax">, </span><span class="identifier-syntax">var_states</span><span class="plain-syntax">[26], </span><span class="identifier-syntax">c</span><span class="plain-syntax">=0;</span>
|
|
<span class="plain-syntax"> </span><a href="11-bas.html#SP3" class="function-link"><span class="function-syntax">Calculus::Variables::determine_status</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">, </span><span class="identifier-syntax">var_states</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">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">j</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">j</span><span class="plain-syntax"><26; </span><span class="identifier-syntax">j</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">var_states</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">] != </span><span class="constant-syntax">UNUSED_VST</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">"%c%s - %u. "</span><span class="plain-syntax">, </span><span class="identifier-syntax">pcalc_vars</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">],</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">var_states</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">] == </span><span class="constant-syntax">FREE_VST</span><span class="plain-syntax">)?</span><span class="string-syntax">" (free)"</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">vta</span><span class="plain-syntax">.</span><span class="element-syntax">assigned_kinds</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">]); </span><span class="identifier-syntax">c</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">c</span><span class="plain-syntax">>0) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. The kind of a term. </b>The following routine works out the kind of value stored in a term, something
|
|
which requires contextual information: unless we know the kind of value stored
|
|
in each variable, we cannot know the kind of value a general term represents,
|
|
which is why the routine is here and not in the Terms section.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</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">Calculus::Propositions::Checker::kind_of_term</span></span>:<br/><a href="11-tcp.html#SP5">§5</a>, <a href="11-tcp.html#SP5_5">§5.5</a>, <a href="11-tcp.html#SP5_8">§5.8</a>, <a href="11-tcp.html#SP5_9">§5.9</a>, <a href="11-tcp.html#SP5_10">§5.10</a>, <a href="11-tcp.html#SP5_11">§5.11</a>, <a href="11-tcp.html#SP7">§7</a>, <a href="11-tcp.html#SP9">§9</a>, <a href="11-tcp.html#SP10">§10</a>, <a href="11-tcp.html#SP10_2">§10.2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">pcalc_term</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pt</span><span class="plain-syntax">, </span><span class="reserved-syntax">variable_type_assignment</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vta</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tck</span><span class="plain-syntax">) {</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><a href="11-tcp.html#SP7" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term_inner</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">, </span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">term_checked_as_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">K</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) { </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">MATCHING</span><span class="plain-syntax">, </span><span class="string-syntax">"No kind for term $0 = $T\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pt</span><span class="plain-syntax">, </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">constant</span><span class="plain-syntax">); </span><span class="identifier-syntax">tck</span><span class="plain-syntax">-></span><span class="element-syntax">flag_problem</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">K</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>The case needing attention is a term in the form \(t = f_B(s)\). By recursion
|
|
we can know the kind of \(s\), but we must check that \(f_B\) can validly be applied
|
|
to a value of that kind. If \(B\) is a binary predicate with domains \(R\) and \(S\)
|
|
(i.e., a subset of \(R\times S\)) then we will either have \(f_B:R\to S\) or vice
|
|
versa; so we have to check that \(s\) lies in \(R\) (or \(S\), respectively).
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term_inner</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">Calculus::Propositions::Checker::kind_of_term_inner</span></span>:<br/><a href="11-tcp.html#SP6">§6</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">pcalc_term</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pt</span><span class="plain-syntax">, </span><span class="reserved-syntax">variable_type_assignment</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vta</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tck</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">pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">constant</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="14-sp.html#SP1" class="function-link"><span class="function-syntax">Specifications::to_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">constant</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">pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">variable</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><span class="identifier-syntax">vta</span><span class="plain-syntax">-></span><span class="element-syntax">assigned_kinds</span><span class="plain-syntax">[</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">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">pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">function</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</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></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">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">kind_found</span><span class="plain-syntax"> = </span><a href="11-tcp.html#SP6" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></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="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">kind_from</span><span class="plain-syntax"> = </span><a href="11-tcp.html#SP8" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::approximate_argument_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">function</span><span class="plain-syntax">-></span><span class="identifier-syntax">from_term</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">kind_to</span><span class="plain-syntax"> = </span><a href="11-tcp.html#SP8" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::approximate_argument_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="constant-syntax">1</span><span class="plain-syntax"> - </span><span class="identifier-syntax">pt</span><span class="plain-syntax">-></span><span class="identifier-syntax">function</span><span class="plain-syntax">-></span><span class="identifier-syntax">from_term</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">kind_from</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">kind_found</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind_from</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</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">"Term $0 applies function to %u not %u\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pt</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind_found</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind_from</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="11-tcp.html#SP11" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::issue_bp_typecheck_error</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind_found</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind_to</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind_found</span><span class="plain-syntax"> = </span><span class="identifier-syntax">kind_from</span><span class="plain-syntax">; </span><span class="comment-syntax"> the better to recover</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">kind_to</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">kind_to</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">kind_found</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="SP8" class="paragraph-anchor"></a><b>§8. </b>Some relations specify a kind for their terms, others do not. When they do
|
|
specify a kind of object, we usually want to be forgiving about nuances of
|
|
the kind of object — for our purposes here, any object will do. (Run-time
|
|
type checking takes care of those nuances better.)
|
|
</p>
|
|
|
|
<p class="commentary">The following gives the kind of a given term. It should be used only where
|
|
the BP is one constraining its terms, such as when it provides a \(f_B\)
|
|
function.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="function-syntax">Calculus::Propositions::Checker::approximate_argument_kind</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">Calculus::Propositions::Checker::approximate_argument_kind</span></span>:<br/><a href="11-tcp.html#SP7">§7</a></span></button><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="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="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax"> = </span><span class="identifier-syntax">BinaryPredicates::term_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</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">K</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">K_object</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">Kinds::weaken</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</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. Type-checking predicates. </b>We take unary predicates first, then binary. Unary predicates are just
|
|
adjectives, and all of the work for that has already been done, so we need
|
|
only produce a problem message when the worst happens.
|
|
</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">Calculus::Propositions::Checker::type_check_unary_predicate</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">Calculus::Propositions::Checker::type_check_unary_predicate</span></span>:<br/><a href="11-tcp.html#SP5_6">§5.6</a>, <a href="11-tcp.html#SP5_7">§5.7</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="reserved-syntax">variable_type_assignment</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vta</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tck</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">adjective</span><span class="plain-syntax"> *</span><span class="identifier-syntax">aph</span><span class="plain-syntax"> = </span><span class="identifier-syntax">UnaryPredicates::get_adj</span><span class="plain-syntax">(</span><span class="identifier-syntax">tr</span><span class="plain-syntax">);</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><a href="11-tcp.html#SP6" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</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">aph</span><span class="plain-syntax">) && (</span><a href="7-am.html#SP12" class="function-link"><span class="function-syntax">Adjectives::Meanings::applicable_to</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">aph</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="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">Adjectives::get_nominative_singular</span><span class="plain-syntax">(</span><span class="identifier-syntax">aph</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</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">"Adjective '%W' undefined on %u\n"</span><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="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(4, </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">(5, </span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-si.html#SP6" class="function-link"><span class="function-syntax">StandardProblems::tcp_problem</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_AdjectiveMisapplied</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to involve applying the adjective '%4' to %5 - and I "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"have no definition of it which would apply in that situation. "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"(Try looking it up in the Lexicon part of the Phrasebook index "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"to see what definition(s) '%4' has.)"</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">NEVER_MATCH</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">ALWAYS_MATCH</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>§10. </b>Binary predicates (BPs) are both easier and harder. Easier because they
|
|
have only one definition at a time (unlike, say, the adjective "empty"),
|
|
harder because the work hasn't already been done and because some BPs —
|
|
like "is" — are polymorphic. Here goes:
|
|
</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">Calculus::Propositions::Checker::type_check_binary_predicate</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">Calculus::Propositions::Checker::type_check_binary_predicate</span></span>:<br/><a href="11-tcp.html#SP5_7">§5.7</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="reserved-syntax">variable_type_assignment</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vta</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tck</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</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">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[2], *</span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">[2];</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP10_2" class="named-paragraph-link"><span class="named-paragraph">Work out what kinds we find</span><span class="named-paragraph-number">10.2</span></a></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</span><span class="plain-syntax"> == </span><span class="identifier-syntax">R_universal</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP10_3" class="named-paragraph-link"><span class="named-paragraph">Adapt to the universal relation</span><span class="named-paragraph-number">10.3</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="11-tcp.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Work out what kinds we should have found</span><span class="named-paragraph-number">10.1</span></a></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">result</span><span class="plain-syntax"> = </span><span class="identifier-syntax">BinaryPredicates::typecheck</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">, </span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</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">result</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NEVER_MATCH_SAYING_WHY_NOT</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">kinds_dereferencing_properties</span><span class="plain-syntax">[2];</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"0 = %u. 1 = %u\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[0], </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1]);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kinds_dereferencing_properties</span><span class="plain-syntax">[0] = </span><span class="identifier-syntax">Kinds::dereference_properties</span><span class="plain-syntax">(</span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[0]);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kinds_dereferencing_properties</span><span class="plain-syntax">[1] = </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">r2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">BinaryPredicates::typecheck</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">kinds_dereferencing_properties</span><span class="plain-syntax">, </span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</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">r2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">ALWAYS_MATCH</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">r2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">SOMETIMES_MATCH</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">result</span><span class="plain-syntax"> = </span><span class="identifier-syntax">r2</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">result</span><span class="plain-syntax"> != </span><span class="identifier-syntax">DECLINE_TO_MATCH</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">result</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NEVER_MATCH_SAYING_WHY_NOT</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">issue_error</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NEVER_MATCH</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="element-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><a href="11-tcp.html#SP11" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::issue_bp_typecheck_error</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-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><a href="11-tcp.html#SP6" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-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="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1], </span><span class="identifier-syntax">tck</span><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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[1].</span><span class="identifier-syntax">function</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><a href="11-tcp.html#SP11" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::issue_bp_typecheck_error</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[0],</span>
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<span class="plain-syntax"> </span><a href="11-tcp.html#SP6" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-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="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">tck</span><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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"(%u, %u) failed in $2\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[0], </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1], </span><span class="identifier-syntax">bp</span><span class="plain-syntax">);</span>
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<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">(4, </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[0]);</span>
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|
<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">kinds_of_terms</span><span class="plain-syntax">[1]);</span>
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|
<span class="plain-syntax"> </span><a href="2-si.html#SP6" class="function-link"><span class="function-syntax">StandardProblems::tcp_problem</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_ComparisonFailed</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"that would mean comparing two kinds of value which cannot mix - "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"%4 and %5 - so this must be incorrect."</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">NEVER_MATCH</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">result</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="11-tcp.html#SP10_4" class="named-paragraph-link"><span class="named-paragraph">Apply default rule applying to most binary predicates</span><span class="named-paragraph-number">10.4</span></a></span><span class="plain-syntax">;</span>
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|
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ALWAYS_MATCH</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="SP10_1" class="paragraph-anchor"></a><b>§10.1. </b>Once again we treat any kind of object as just "object", but we do take
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note that some BPs — like "is" — specify no kinds at all, and so
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produce a <span class="extract"><span class="extract-syntax">kinds_required</span></span> which is <span class="extract"><span class="extract-syntax">NULL</span></span>.
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</p>
|
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Work out what kinds we should have found</span><span class="named-paragraph-number">10.1</span></span><span class="comment-syntax"> =</span>
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</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
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<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"><2; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
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<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="identifier-syntax">Kinds::weaken</span><span class="plain-syntax">(</span><span class="identifier-syntax">BinaryPredicates::term_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">), </span><span class="identifier-syntax">K_object</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">K</span><span class="plain-syntax"> = </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</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>
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</pre>
|
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<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP10">§10</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP10_2" class="paragraph-anchor"></a><b>§10.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Work out what kinds we find</span><span class="named-paragraph-number">10.2</span></span><span class="comment-syntax"> =</span>
|
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</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<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"><2; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] =</span>
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<span class="plain-syntax"> </span><a href="11-tcp.html#SP6" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::kind_of_term</span></a><span class="plain-syntax">(&(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]), </span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP10">§10</a>.</li></ul>
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|
<p class="commentary firstcommentary"><a id="SP10_3" class="paragraph-anchor"></a><b>§10.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Adapt to the universal relation</span><span class="named-paragraph-number">10.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::get_construct</span><span class="plain-syntax">(</span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[0]) != </span><span class="identifier-syntax">CON_relation</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">(4, </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[0]);</span>
|
|
<span class="plain-syntax"> </span><a href="2-si.html#SP6" class="function-link"><span class="function-syntax">StandardProblems::tcp_problem</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_BadUniversal1</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that asks whether something relates something, and in Inform 'to relate' "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"means that a particular relation applies between two things. Here, though, "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"we have %4 rather than the name of a relation."</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">NEVER_MATCH</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">Kinds::get_construct</span><span class="plain-syntax">(</span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1]) != </span><span class="identifier-syntax">CON_combination</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">(4, </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1]);</span>
|
|
<span class="plain-syntax"> </span><a href="2-si.html#SP6" class="function-link"><span class="function-syntax">StandardProblems::tcp_problem</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="identifier-syntax">tck</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that asks whether something relates something, and in Inform 'to relate' "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"means that a particular relation applies between two things. Here, though, "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"we have %4 rather than the combination of the two things."</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">NEVER_MATCH</span><span class="plain-syntax">;</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">left</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-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="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">left</span><span class="plain-syntax">, </span><span class="constant-syntax">CONSTANT_NT</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">bp</span><span class="plain-syntax"> = </span><a href="14-rv.html#SP2" class="function-link"><span class="function-syntax">Rvalues::to_binary_predicate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">left</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cleft</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">cright</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">Kinds::binary_construction_material</span><span class="plain-syntax">(</span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1], &</span><span class="identifier-syntax">cleft</span><span class="plain-syntax">, &</span><span class="identifier-syntax">cright</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[0] = </span><span class="identifier-syntax">cleft</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1] = </span><span class="identifier-syntax">cright</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP10">§10</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP10_4" class="paragraph-anchor"></a><b>§10.4. </b>The default rule is straightforward: the kinds found have to match the kinds
|
|
required.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Apply default rule applying to most binary predicates</span><span class="named-paragraph-number">10.4</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">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">for</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"><2; </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">kinds_required</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">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">], </span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]) == </span><span class="identifier-syntax">NEVER_MATCH</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">tck</span><span class="plain-syntax">-></span><span class="element-syntax">log_to_I6_text</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">"Term %d is %u not %u\n"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">], </span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]);</span>
|
|
<span class="plain-syntax"> </span><a href="11-tcp.html#SP11" class="function-link"><span class="function-syntax">Calculus::Propositions::Checker::issue_bp_typecheck_error</span></a><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">kinds_of_terms</span><span class="plain-syntax">[0], </span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1], </span><span class="identifier-syntax">tck</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">NEVER_MATCH</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="11-tcp.html#SP10">§10</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>§11. Two problem messages needed more than once. </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">Calculus::Propositions::Checker::issue_bp_typecheck_error</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">Calculus::Propositions::Checker::issue_bp_typecheck_error</span></span>:<br/><a href="11-tcp.html#SP7">§7</a>, <a href="11-tcp.html#SP10">§10</a>, <a href="11-tcp.html#SP10_4">§10.4</a><br/>Comparative Relations - <a href="15-cr.html#SP4">§4</a></span></button><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="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">t0</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">t1</span><span class="plain-syntax">, </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tck</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">(4, </span><span class="identifier-syntax">t0</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">t1</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-sq.html#SP1" class="function-link"><span class="function-syntax">Problems::quote_relation</span></a><span class="plain-syntax">(6, </span><span class="identifier-syntax">bp</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-si.html#SP6" class="function-link"><span class="function-syntax">StandardProblems::tcp_problem</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_TypeCheckBP2</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that would mean applying %6 to kinds of value which do not "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"fit - %4 and %5 - so this must be incorrect."</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">Calculus::Propositions::Checker::issue_kind_typecheck_error</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">Calculus::Propositions::Checker::issue_kind_typecheck_error</span></span>:<br/><a href="11-tcp.html#SP5_2">§5.2</a>, <a href="11-tcp.html#SP5_5">§5.5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax">, </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tck</span><span class="plain-syntax">, </span><span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ka</span><span class="plain-syntax">) {</span>
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<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">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">ka</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">GENERAL_POINTER_IS_NULL</span><span class="plain-syntax">(</span><span class="identifier-syntax">ka</span><span class="plain-syntax">-></span><span class="identifier-syntax">predicate</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">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">ka</span><span class="plain-syntax">-></span><span class="identifier-syntax">predicate</span><span class="plain-syntax">);</span>
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<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">(4, </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">);</span>
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<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">need_to_find</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">bp</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="2-sq.html#SP1" class="function-link"><span class="function-syntax">Problems::quote_relation</span></a><span class="plain-syntax">(6, </span><span class="identifier-syntax">bp</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-si.html#SP6" class="function-link"><span class="function-syntax">StandardProblems::tcp_problem</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_TypeCheckBP2a</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"that doesn't work because you use %6 with %4 instead of %5."</span><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>
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<span class="plain-syntax"> </span><a href="2-si.html#SP6" class="function-link"><span class="function-syntax">StandardProblems::tcp_problem</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_TypeCheckKind</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"%4 cannot be %5, so this must be incorrect."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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</pre>
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