ifhub/inform7
1
0
Fork 0
mirror of https://github.com/ganelson/inform.git synced 2024-07-08 18:14:21 +03:00
Code Issues Projects Releases Wiki Activity
inform7/docs/knowledge-module/5-pi.html
Graham Nelson 89f9b0e45d Refactored inferences
2021-02-16 00:54:32 +00:00

247 lines
50 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>Property Inferences</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="../core-module/index.html">core</a></li>
<li><a href="../assertions-module/index.html">assertions</a></li>
<li><a href="../values-module/index.html">values</a></li>
<li><a href="index.html"><span class="selectedlink">knowledge</span></a></li>
<li><a href="../imperative-module/index.html">imperative</a></li>
<li><a href="../runtime-module/index.html">runtime</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 'Property Inferences' generated by Inweb-->
<div class="breadcrumbs">
<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7</a></li><li><a href="index.html">knowledge</a></li><li><a href="index.html#5">Chapter 5: Modelling</a></li><li><b>Property Inferences</b></li></ul></div>
<p class="purpose">Inferences that a property of something is true, or has a particular value.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>We will make:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">inference_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">property_inf</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </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">PropertyInferences::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">PropertyInferences::start</span></span>:<br/>Knowledge Module - <a href="1-km.html#SP3">&#167;3</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_inf</span><span class="plain-syntax"> = </span><a href="5-inf.html#SP2" class="function-link"><span class="function-syntax">Inferences::new_family</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"property_inf"</span><span class="plain-syntax">, </span><span class="constant-syntax">CI_DIFFER_IN_PROPERTY_VALUE</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_inf</span><span class="plain-syntax">, </span><span class="constant-syntax">LOG_INF_MTID</span><span class="plain-syntax">, </span><a href="5-pi.html#SP2" class="function-link"><span class="function-syntax">PropertyInferences::log</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_inf</span><span class="plain-syntax">, </span><span class="constant-syntax">COMPARE_INF_MTID</span><span class="plain-syntax">, </span><a href="5-pi.html#SP2" class="function-link"><span class="function-syntax">PropertyInferences::cmp</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_inf</span><span class="plain-syntax">, </span><span class="constant-syntax">JOIN_INF_MTID</span><span class="plain-syntax">, </span><a href="5-pi.html#SP2" class="function-link"><span class="function-syntax">PropertyInferences::join</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_inf</span><span class="plain-syntax">, </span><span class="constant-syntax">EXPLAIN_CONTRADICTION_INF_MTID</span><span class="plain-syntax">, </span><a href="5-pi.html#SP2" class="function-link"><span class="function-syntax">PropertyInferences::explain_contradiction</span></a><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">PropertyInferences::join</span><span class="plain-syntax">(</span><span class="reserved-syntax">inference_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inf</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">property_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">data</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Plugins::Call::property_value_notify</span><span class="plain-syntax">(</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property</span><span class="plain-syntax">, </span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">PropertyInferences::cmp</span><span class="plain-syntax">(</span><span class="reserved-syntax">inference_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i1</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i2</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">property_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">i1</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">data</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">property_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">i2</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">data</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">pr1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">data1</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property</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">pr2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">data2</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_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">pr1</span><span class="plain-syntax">) &amp;&amp; (</span><a href="3-prp.html#SP15" class="function-link"><span class="function-syntax">Properties::is_either_or</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pr1</span><span class="plain-syntax">)) &amp;&amp;</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">pr2</span><span class="plain-syntax">) &amp;&amp; (</span><a href="3-prp.html#SP15" class="function-link"><span class="function-syntax">Properties::is_either_or</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pr2</span><span class="plain-syntax">)) &amp;&amp;</span>
<span class="plain-syntax"> ((</span><span class="identifier-syntax">pr1</span><span class="plain-syntax"> == </span><a href="3-ep.html#SP6" class="function-link"><span class="function-syntax">Properties::EitherOr::get_negation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pr2</span><span class="plain-syntax">)) ||</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">pr2</span><span class="plain-syntax"> == </span><a href="3-ep.html#SP6" class="function-link"><span class="function-syntax">Properties::EitherOr::get_negation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pr1</span><span class="plain-syntax">)))) </span><span class="identifier-syntax">pr2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pr1</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">c</span><span class="plain-syntax"> = </span><a href="5-inf.html#SP21" class="function-link"><span class="function-syntax">Inferences::measure_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pr1</span><span class="plain-syntax">) - </span><a href="5-inf.html#SP21" class="function-link"><span class="function-syntax">Inferences::measure_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pr2</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"> &gt; </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="constant-syntax">CI_DIFFER_IN_PROPERTY</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"> &lt; </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="constant-syntax">CI_DIFFER_IN_PROPERTY</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><a href="5-inf.html#SP21" class="function-link"><span class="function-syntax">Inferences::measure_inf</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i1</span><span class="plain-syntax">) - </span><a href="5-inf.html#SP21" class="function-link"><span class="function-syntax">Inferences::measure_inf</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i2</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">val1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">data1</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</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">val2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">data2</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</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">data1</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property</span><span class="plain-syntax"> != </span><span class="identifier-syntax">data2</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property</span><span class="plain-syntax">) || </span><span class="comment-syntax"> in case they are an either-or pair</span>
<span class="plain-syntax"> ((</span><span class="identifier-syntax">val1</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">val2</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">Rvalues::compare_CONSTANT</span><span class="plain-syntax">(</span><span class="identifier-syntax">val1</span><span class="plain-syntax">, </span><span class="identifier-syntax">val2</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">))) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> &gt; </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="constant-syntax">CI_DIFFER_IN_PROPERTY_VALUE</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"> &lt; </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="constant-syntax">CI_DIFFER_IN_PROPERTY_VALUE</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"> &gt; </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="constant-syntax">CI_DIFFER_IN_COPY_ONLY</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"> &lt; </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="constant-syntax">CI_DIFFER_IN_COPY_ONLY</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">CI_IDENTICAL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">PropertyInferences::explain_contradiction</span><span class="plain-syntax">(</span><span class="reserved-syntax">inference_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">A</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">B</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">similarity</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">subj</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">property_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">A_data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">data</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">property_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">B_data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">B</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">data</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">B_data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property</span><span class="plain-syntax"> == </span><span class="identifier-syntax">P_variable_initial_value</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::two_sentences_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_VariableContradiction</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_from</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"this looks like a contradiction"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"because the initial value of this variable seems to be being set "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"in each of these sentences, but with a different outcome."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="3-prp.html#SP15" class="function-link"><span class="function-syntax">Properties::is_value_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">B_data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property</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="plain-syntax"> </span><a href="3-vp.html#SP8" class="function-link"><span class="function-syntax">Properties::Valued::get_stored_relation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">B_data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_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">bp</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wordings::match</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_from</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_relation</span><span class="plain-syntax">(3, </span><span class="identifier-syntax">bp</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_subject</span><span class="plain-syntax">(4, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_spec</span><span class="plain-syntax">(5, </span><span class="identifier-syntax">B_data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_spec</span><span class="plain-syntax">(6, </span><span class="identifier-syntax">A_data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_RelationContradiction2</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
<span class="plain-syntax"> </span><span class="string-syntax">"I'm finding a contradiction at the sentence %1, "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"because it means I can't set up %3. "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"On the one hand, %4 should relate to %5, but on the other "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"hand to %6, and this is a relation which doesn't allow "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"such clashes."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_from</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_relation</span><span class="plain-syntax">(3, </span><span class="identifier-syntax">bp</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_subject</span><span class="plain-syntax">(4, </span><span class="identifier-syntax">subj</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_spec</span><span class="plain-syntax">(5, </span><span class="identifier-syntax">B_data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_spec</span><span class="plain-syntax">(6, </span><span class="identifier-syntax">A_data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_RelationContradiction</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
<span class="plain-syntax"> </span><span class="string-syntax">"I'm finding a contradiction at the sentences %1 and %2, "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"because between them they set up rival versions of %3. "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"On the one hand, %4 should relate to %5, but on the other "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"hand to %6, and this is a relation which doesn't allow "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"such clashes."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::two_sentences_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_PropertyContradiction</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_from</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"this looks like a contradiction"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"because the same property seems to be being set in each of these sentences, "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"but with a different outcome."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">PropertyInferences::log</span><span class="plain-syntax">(</span><span class="reserved-syntax">inference_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inf</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">property_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">data</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">"(%W)"</span><span class="plain-syntax">, </span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">name</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">":=$P"</span><span class="plain-syntax">, </span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</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">property_inference_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">inferred_property</span><span class="plain-syntax">; </span><span class="comment-syntax"> property referred to, if any</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inferred_property_value</span><span class="plain-syntax">; </span><span class="comment-syntax"> and its value, if any</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">property_inference_data</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="function-syntax">PropertyInferences::new</span><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="constant-syntax">PROTECTED_MODEL_PROCEDURE</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"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"null property inference"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">property_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">property_inference_data</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">inferred_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">data</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">inferred_property_value</span><span class="plain-syntax"> = </span><span class="identifier-syntax">val</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><span class="identifier-syntax">prevailing_mood</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"> == </span><span class="identifier-syntax">UNKNOWN_CE</span><span class="plain-syntax">) </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><a href="4-is.html#SP19" class="function-link"><span class="function-syntax">InferenceSubjects::get_default_certainty</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><a href="5-inf.html#SP9" class="function-link"><span class="function-syntax">Inferences::create_inference</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">property_inf</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">STORE_POINTER_property_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">data</span><span class="plain-syntax">), </span><span class="identifier-syntax">c</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">PropertyInferences::draw</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">PropertyInferences::draw</span></span>:<br/>Instances as Adjectives - <a href="2-iaa.html#SP3">&#167;3</a><br/>Either-Or Properties - <a href="3-ep.html#SP14">&#167;14</a><br/>Measurement Adjectives - <a href="3-ma.html#SP12">&#167;12</a><br/>Setting Property Relation - <a href="3-spr2.html#SP10">&#167;10</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><a href="5-pi.html#SP2" class="function-link"><span class="function-syntax">PropertyInferences::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="5-inf.html#SP22" class="function-link"><span class="function-syntax">Inferences::join_inference</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</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">PropertyInferences::draw_negated</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">PropertyInferences::draw_negated</span></span>:<br/>Either-Or Properties - <a href="3-ep.html#SP14">&#167;14</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><a href="5-pi.html#SP2" class="function-link"><span class="function-syntax">PropertyInferences::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">certainty</span><span class="plain-syntax"> = -</span><span class="identifier-syntax">i</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">certainty</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="5-inf.html#SP22" class="function-link"><span class="function-syntax">Inferences::join_inference</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="function-syntax">PropertyInferences::get_property</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">PropertyInferences::get_property</span></span>:<br/>Nonlocal Variables - <a href="2-nv.html#SP11">&#167;11</a><br/>Properties - <a href="3-prp.html#SP25">&#167;25</a><br/>Indefinite Appearance - <a href="3-ia.html#SP1">&#167;1</a>, <a href="3-ia.html#SP2">&#167;2</a><br/>Emit Property Values - <a href="3-epv.html#SP1_1_3">&#167;1.1.3</a><br/>Variable Subjects - <a href="4-vs.html#SP2">&#167;2</a><br/>Relation Subjects - <a href="4-rs.html#SP4">&#167;4</a><br/>Inferences - <a href="5-inf.html#SP16">&#167;16</a>, <a href="5-inf.html#SP17">&#167;17</a><br/>The Model World - <a href="5-tmw.html#SP4_1">&#167;4.1</a>, <a href="5-tmw.html#SP4_2">&#167;4.2</a>, <a href="5-tmw.html#SP4_2_1">&#167;4.2.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference</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">property_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">data</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">data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property</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="function-syntax">PropertyInferences::get_value</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">PropertyInferences::get_value</span></span>:<br/>Properties - <a href="3-prp.html#SP25">&#167;25</a><br/>Indefinite Appearance - <a href="3-ia.html#SP2">&#167;2</a><br/>Variable Subjects - <a href="4-vs.html#SP2">&#167;2</a><br/>Relation Subjects - <a href="4-rs.html#SP4">&#167;4</a><br/>Inferences - <a href="5-inf.html#SP16">&#167;16</a>, <a href="5-inf.html#SP17">&#167;17</a><br/>The Model World - <a href="5-tmw.html#SP4_2_1_1">&#167;4.2.1.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference</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">property_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">data</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">data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</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="function-syntax">PropertyInferences::set_value_kind</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">PropertyInferences::set_value_kind</span></span>:<br/>Nonlocal Variables - <a href="2-nv.html#SP11">&#167;11</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">property_inference_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_property_inference_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">data</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Node::set_kind_of_value</span><span class="plain-syntax">(</span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">inferred_property_value</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure property_inference_data is private to this section.</li></ul>
<nav role="progress"><div class="progresscontainer">
<ul class="progressbar"><li class="progressprev"><a href="5-inf.html">&#10094;</a></li><li class="progresschapter"><a href="P-wtmd.html">P</a></li><li class="progresschapter"><a href="1-km.html">1</a></li><li class="progresschapter"><a href="2-ins.html">2</a></li><li class="progresschapter"><a href="3-prp.html">3</a></li><li class="progresschapter"><a href="4-is.html">4</a></li><li class="progresscurrentchapter">5</li><li class="progresssection"><a href="5-inf.html">inf</a></li><li class="progresscurrent">pi</li><li class="progresssection"><a href="5-ri.html">ri</a></li><li class="progresssection"><a href="5-pp.html">pp</a></li><li class="progresssection"><a href="5-tmw.html">tmw</a></li><li class="progressnext"><a href="5-ri.html">&#10095;</a></li></ul></div>
</nav><!--End of weave-->
</main>
</body>
</html>
Reference in a new issue View git blame Copy permalink