ifhub/inform7
1
0
Fork 0
mirror of https://github.com/ganelson/inform.git synced 2024-07-08 10:04:21 +03:00
Code Issues Projects Releases Wiki Activity
inform7/docs/core-module/15-cr.html
Graham Nelson 22d2c3d8bd Moved sentence conversion into calculus module
2020-08-25 21:47:14 +01:00

222 lines
34 KiB
HTML
Raw Blame History

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Comparative Relations</title>
<link href="../docs-assets/Breadcrumbs.css" rel="stylesheet" rev="stylesheet" type="text/css">
<meta name="viewport" content="width=device-width initial-scale=1">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Content-Language" content="en-gb">
<link href="../docs-assets/Contents.css" rel="stylesheet" rev="stylesheet" type="text/css">
<link href="../docs-assets/Progress.css" rel="stylesheet" rev="stylesheet" type="text/css">
<link href="../docs-assets/Navigation.css" rel="stylesheet" rev="stylesheet" type="text/css">
<link href="../docs-assets/Fonts.css" rel="stylesheet" rev="stylesheet" type="text/css">
<link href="../docs-assets/Base.css" rel="stylesheet" rev="stylesheet" type="text/css">
<script>
function togglePopup(material_id) {
var popup = document.getElementById(material_id);
popup.classList.toggle("show");
}
</script>
<link href="../docs-assets/Popups.css" rel="stylesheet" rev="stylesheet" type="text/css">
<link href="../docs-assets/Colours.css" rel="stylesheet" rev="stylesheet" type="text/css">
</head>
<body class="commentary-font">
<nav role="navigation">
<h1><a href="../index.html">
<img src="../docs-assets/Inform.png" height=72">
</a></h1>
<ul><li><a href="../compiler.html">compiler tools</a></li>
<li><a href="../other.html">other tools</a></li>
<li><a href="../extensions.html">extensions and kits</a></li>
<li><a href="../units.html">unit test tools</a></li>
</ul><h2>Compiler Webs</h2><ul>
<li><a href="../inbuild/index.html">inbuild</a></li>
<li><a href="../inform7/index.html">inform7</a></li>
<li><a href="../inter/index.html">inter</a></li>
</ul><h2>Inbuild Modules</h2><ul>
<li><a href="../supervisor-module/index.html">supervisor</a></li>
</ul><h2>Inform7 Modules</h2><ul>
<li><a href="index.html"><span class="selectedlink">core</span></a></li>
<li><a href="../if-module/index.html">if</a></li>
<li><a href="../multimedia-module/index.html">multimedia</a></li>
<li><a href="../index-module/index.html">index</a></li>
</ul><h2>Inter Modules</h2><ul>
<li><a href="../bytecode-module/index.html">bytecode</a></li>
<li><a href="../building-module/index.html">building</a></li>
<li><a href="../codegen-module/index.html">codegen</a></li>
</ul><h2>Services</h2><ul>
<li><a href="../arch-module/index.html">arch</a></li>
<li><a href="../calculus-module/index.html">calculus</a></li>
<li><a href="../html-module/index.html">html</a></li>
<li><a href="../inflections-module/index.html">inflections</a></li>
<li><a href="../kinds-module/index.html">kinds</a></li>
<li><a href="../linguistics-module/index.html">linguistics</a></li>
<li><a href="../problems-module/index.html">problems</a></li>
<li><a href="../syntax-module/index.html">syntax</a></li>
<li><a href="../words-module/index.html">words</a></li>
<li><a href="../../../inweb/docs/foundation-module/index.html">foundation</a></li>
</ul>
</nav>
<main role="main">
<!--Weave of 'Comparative Relations' generated by Inweb-->
<div class="breadcrumbs">
<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#15">Chapter 15: Properties</a></li><li><b>Comparative Relations</b></li></ul></div>
<p class="purpose">When a measurement adjective like "tall" is defined, so is a comparative relation like "taller than".</p>
<ul class="toc"><li><a href="15-cr.html#SP1">&#167;1. Family</a></li><li><a href="15-cr.html#SP2">&#167;2. Second stock</a></li><li><a href="15-cr.html#SP3">&#167;3. Typechecking</a></li><li><a href="15-cr.html#SP4">&#167;4. Assertion</a></li><li><a href="15-cr.html#SP5">&#167;5. Compilation</a></li><li><a href="15-cr.html#SP6">&#167;6. Problem message text</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Family. </b>Unlike the other relations to do with property values, these do not correspond
exactly with the properties. Some properties, like "carrying capacity", might
never be compared with measurement adjectives; others, like "height", might
be compared with more than one ("short", "tall").
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">bp_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">property_comparison_bp_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Properties::ComparativeRelations::start</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">Properties::ComparativeRelations::start</span></span>:<br/>Core Module - <a href="1-cm.html#SP6">&#167;6</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">property_comparison_bp_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">BinaryPredicateFamilies::new</span><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">property_comparison_bp_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">STOCK_BPF_MTID</span><span class="plain-syntax">, </span><a href="15-cr.html#SP2" class="function-link"><span class="function-syntax">Properties::ComparativeRelations::stock</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">property_comparison_bp_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">TYPECHECK_BPF_MTID</span><span class="plain-syntax">, </span><a href="15-cr.html#SP3" class="function-link"><span class="function-syntax">Properties::ComparativeRelations::REL_typecheck</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">property_comparison_bp_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">ASSERT_BPF_MTID</span><span class="plain-syntax">, </span><a href="15-cr.html#SP4" class="function-link"><span class="function-syntax">Properties::ComparativeRelations::REL_assert</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">property_comparison_bp_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">SCHEMA_BPF_MTID</span><span class="plain-syntax">, </span><a href="15-cr.html#SP5" class="function-link"><span class="function-syntax">Properties::ComparativeRelations::REL_compile</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">property_comparison_bp_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">DESCRIBE_FOR_PROBLEMS_BPF_MTID</span><span class="plain-syntax">, </span><a href="15-cr.html#SP6" class="function-link"><span class="function-syntax">Properties::ComparativeRelations::REL_describe_for_problems</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. Second stock. </b>When an adjective is defined so that it performs an inequality comparison
of a property value, like so:
</p>
<blockquote>
<p>Definition: A woman is tall if her height is 68 or more.</p>
</blockquote>
<p class="commentary">...Inform automatically generates a comparative form (here "taller than").
This is where our comparative relations come from, but the work is done in
the previous section.
</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">Properties::ComparativeRelations::stock</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">Properties::ComparativeRelations::stock</span></span>:<br/><a href="15-cr.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">bp_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">n</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">n</span><span class="plain-syntax"> == </span><span class="constant-syntax">2</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="15-ma.html#SP13" class="function-link"><span class="function-syntax">Properties::Measurement::create_comparatives</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
<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">comparative_bp_data</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">comparative_property</span><span class="plain-syntax">; </span><span class="comment-syntax"> (if right way) if a comparative adjective</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">comparison_sign</span><span class="plain-syntax">; </span><span class="comment-syntax"> ...and </span><span class="extract"><span class="extract-syntax">+1</span></span><span class="comment-syntax"> or </span><span class="extract"><span class="extract-syntax">-1</span></span><span class="comment-syntax"> according to sign of definition</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">comparative_bp_data</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Properties::ComparativeRelations::initialise</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">Properties::ComparativeRelations::initialise</span></span>:<br/>Measurement Adjectives - <a href="15-ma.html#SP13_2">&#167;13.2</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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">sign</span><span class="plain-syntax">, </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">comparative_bp_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">comparative_bp_data</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">D</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">comparison_sign</span><span class="plain-syntax"> = </span><span class="identifier-syntax">sign</span><span class="plain-syntax">; </span><span class="identifier-syntax">D</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">comparative_property</span><span class="plain-syntax"> = </span><span class="identifier-syntax">prn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">family_specific</span><span class="plain-syntax"> = </span><span class="identifier-syntax">STORE_POINTER_comparative_bp_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure comparative_bp_data is private to this section.</li></ul>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. Typechecking. </b>Because of the ambiguity between absolute and relative comparisons (see
below), we'll typecheck this asymmetrically; the left term is typechecked
as usual, but the right is more leniently handled.
</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">Properties::ComparativeRelations::REL_typecheck</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">Properties::ComparativeRelations::REL_typecheck</span></span>:<br/><a href="15-cr.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">bp_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</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="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">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> **</span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">, </span><span class="identifier-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">kinds_required</span><span class="plain-syntax">[0]) &amp;&amp;</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">[0], </span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">[0]) == </span><span class="identifier-syntax">NEVER_MATCH</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">kinds_of_terms</span><span class="plain-syntax">[0], </span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">[0]);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Propositions::Checker::issue_bp_typecheck_error</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">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>
<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><a href="15-cp.html#SP5" class="function-link"><span class="function-syntax">Properties::Conditions::get_coinciding_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">[1]);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">comparative_bp_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_comparative_bp_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">family_specific</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">prn</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> != </span><span class="identifier-syntax">D</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">comparative_property</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">-&gt;</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">"Comparative misapplied to $Y not $Y\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><span class="identifier-syntax">D</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">comparative_property</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-sq.html#SP2" class="function-link"><span class="function-syntax">Problems::quote_property</span></a><span class="plain-syntax">(4, </span><span class="identifier-syntax">D</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">comparative_property</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-sq.html#SP2" class="function-link"><span class="function-syntax">Problems::quote_property</span></a><span class="plain-syntax">(5, </span><span class="identifier-syntax">prn</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_ComparativeMisapplied</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 ought to make a comparison of %4 not %5."</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="SP4" class="paragraph-anchor"></a><b>&#167;4. Assertion. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Properties::ComparativeRelations::REL_assert</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">Properties::ComparativeRelations::REL_assert</span></span>:<br/><a href="15-cr.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">bp_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</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="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs0</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec0</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs1</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec1</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. Compilation. </b>We need do nothing special: these relations can be compiled from their schemas.
</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">Properties::ComparativeRelations::REL_compile</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">Properties::ComparativeRelations::REL_compile</span></span>:<br/><a href="15-cr.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">bp_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">task</span><span class="plain-syntax">, </span><span class="identifier-syntax">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">annotated_i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">asch</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">task</span><span class="plain-syntax"> == </span><span class="identifier-syntax">TEST_ATOM_TASK</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="15-cr.html#SP5_1" class="named-paragraph-link"><span class="named-paragraph">Rewrite the annotated schema if it turns out to be an absolute comparison</span><span class="named-paragraph-number">5.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</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>&#167;5.1. </b>Normally, "taller than" would relate two people, and compare their heights.
But we also want to allow absolute comparison like this one:
</p>
<blockquote>
<p>if Geoff is taller than 4 foot 5 inches, ...</p>
</blockquote>
<p class="commentary">In that case we need a different schema, where right and left are not handled
so symmetrically; we rewrite the annotated schema on the fly.
</p>
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Rewrite the annotated schema if it turns out to be an absolute comparison</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">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">st</span><span class="plain-syntax">[2];</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">st</span><span class="plain-syntax">[0] = </span><a href="12-cad.html#SP6" class="function-link"><span class="function-syntax">Calculus::Deferrals::Cinders::kind_of_value_of_term</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">pt0</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">st</span><span class="plain-syntax">[1] = </span><a href="12-cad.html#SP6" class="function-link"><span class="function-syntax">Calculus::Deferrals::Cinders::kind_of_value_of_term</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">pt1</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::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">st</span><span class="plain-syntax">[0], </span><span class="identifier-syntax">st</span><span class="plain-syntax">[1]) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) &amp;&amp;</span>
<span class="plain-syntax"> (</span><a href="15-cp.html#SP5" class="function-link"><span class="function-syntax">Properties::Conditions::name_can_coincide_with_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">st</span><span class="plain-syntax">[1]))) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><a href="15-cp.html#SP5" class="function-link"><span class="function-syntax">Properties::Conditions::get_coinciding_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">st</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">prn</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">comparative_bp_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_comparative_bp_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">family_specific</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">schema</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"*1.%n %s *2"</span><span class="plain-syntax">, </span><a href="15-pr.html#SP26" class="function-link"><span class="function-syntax">Properties::iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><a href="15-ma.html#SP4" class="function-link"><span class="function-syntax">Properties::Measurement::strict_comparison</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">comparison_sign</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="15-cr.html#SP5">&#167;5</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. Problem message text. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Properties::ComparativeRelations::REL_describe_for_problems</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">Properties::ComparativeRelations::REL_describe_for_problems</span></span>:<br/><a href="15-cr.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">bp_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="identifier-syntax">OUTPUT_STREAM</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="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<nav role="progress"><div class="progresscontainer">
<ul class="progressbar"><li class="progressprev"><a href="15-tpr.html">&#10094;</a></li><li class="progresschapter"><a href="P-wtmd.html">P</a></li><li class="progresschapter"><a href="1-cm.html">1</a></li><li class="progresschapter"><a href="2-up.html">2</a></li><li class="progresschapter"><a href="3-bv.html">3</a></li><li class="progresschapter"><a href="4-dlr.html">4</a></li><li class="progresschapter"><a href="5-rpt.html">5</a></li><li class="progresschapter"><a href="6-lp.html">6</a></li><li class="progresschapter"><a href="7-am.html">7</a></li><li class="progresschapter"><a href="8-ptu.html">8</a></li><li class="progresschapter"><a href="9-ef.html">9</a></li><li class="progresschapter"><a href="10-its.html">10</a></li><li class="progresschapter"></li><li class="progresschapter"><a href="12-terr.html">12</a></li><li class="progresschapter"><a href="13-kak.html">13</a></li><li class="progresschapter"><a href="14-sp.html">14</a></li><li class="progresscurrentchapter">15</li><li class="progresssection"><a href="15-pr.html">pr</a></li><li class="progresssection"><a href="15-ep.html">ep</a></li><li class="progresssection"><a href="15-vp.html">vp</a></li><li class="progresssection"><a href="15-ps.html">ps</a></li><li class="progresssection"><a href="15-cp.html">cp</a></li><li class="progresssection"><a href="15-ia.html">ia</a></li><li class="progresssection"><a href="15-tpr.html">tpr</a></li><li class="progresscurrent">cr</li><li class="progresssection"><a href="15-ma.html">ma</a></li><li class="progresssection"><a href="15-spr.html">spr</a></li><li class="progresssection"><a href="15-spr2.html">spr2</a></li><li class="progresssection"><a href="15-pov.html">pov</a></li><li class="progresssection"><a href="15-epv.html">epv</a></li><li class="progresschapter"><a href="16-is.html">16</a></li><li class="progresschapter"><a href="17-tl.html">17</a></li><li class="progresschapter"><a href="18-lc.html">18</a></li><li class="progresschapter"><a href="19-tc.html">19</a></li><li class="progresschapter"><a href="20-eq.html">20</a></li><li class="progresschapter"><a href="21-rl.html">21</a></li><li class="progresschapter"><a href="22-itp.html">22</a></li><li class="progresschapter"><a href="23-ad.html">23</a></li><li class="progresschapter"><a href="24-lv.html">24</a></li><li class="progresschapter"><a href="25-in.html">25</a></li><li class="progresschapter"><a href="26-fc.html">26</a></li><li class="progresschapter"><a href="27-hr.html">27</a></li><li class="progressnext"><a href="15-ma.html">&#10095;</a></li></ul></div>
</nav><!--End of weave-->
</main>
</body>
</html>
Reference in a new issue View git blame Copy permalink