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<!--Weave of 'Listed-In Relations' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inform7n.html">Inform7</a></li><li><a href="index.html">assertions</a></li><li><a href="index.html#8">Chapter 8: Predicates</a></li><li><b>Listed-In Relations</b></li></ul></div>
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<p class="purpose">To define the binary predicates corresponding to table columns, and which determine whether a given value is listed in that column.</p>
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<ul class="toc"><li><a href="8-lr.html#SP1">§1. Family</a></li><li><a href="8-lr.html#SP2">§2. Subsequent creations</a></li><li><a href="8-lr.html#SP4">§4. Typechecking</a></li><li><a href="8-lr.html#SP5">§5. Assertion</a></li><li><a href="8-lr.html#SP6">§6. Compilation</a></li><li><a href="8-lr.html#SP7">§7. Problem message text</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Family. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">bp_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">listed_in_bp_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Tables::Relations::start</span><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="identifier-syntax">listed_in_bp_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">BinaryPredicateFamilies::new</span><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">listed_in_bp_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">TYPECHECK_BPF_MTID</span><span class="plain-syntax">, </span><a href="8-lr.html#SP4" class="function-link"><span class="function-syntax">Tables::Relations::typecheck</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">listed_in_bp_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">ASSERT_BPF_MTID</span><span class="plain-syntax">, </span><a href="8-lr.html#SP5" class="function-link"><span class="function-syntax">Tables::Relations::assert</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">listed_in_bp_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">SCHEMA_BPF_MTID</span><span class="plain-syntax">, </span><a href="8-lr.html#SP6" class="function-link"><span class="function-syntax">Tables::Relations::schema</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">listed_in_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="8-lr.html#SP7" class="function-link"><span class="function-syntax">Tables::Relations::describe_for_problems</span></a><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="SP2" class="paragraph-anchor"></a><b>§2. Subsequent creations. </b>When a column called, say, "pledged delegate count" appears in one or more
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tables in the source text, Inform creates a <span class="extract"><span class="extract-syntax">table_column</span></span> structure to
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represent the common identity of all table columns with this name. (They
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are required all to share the same kind of value in their entries.) For
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each different table column, a BP is created to represent the meaning
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of "X is a pledged delegate count listed in T". Arguably there should just
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be one super-powerful predicate <span class="extract"><span class="extract-syntax">listed-in(X, C, T)</span></span>, but that would need
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to be a ternary predicate, not binary, and Inform doesn't at present support
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those. So we make a one-parameter family of <span class="extract"><span class="extract-syntax">listed-in-C(X, T)</span></span> binary
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predicates instead.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="function-syntax">Tables::Relations::make_listed_in_predicate</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">Tables::Relations::make_listed_in_predicate</span></span>:<br/>Table Columns - <a href="7-tc.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">table_column</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tc</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">BinaryPredicates::make_pair</span><span class="plain-syntax">(</span><span class="identifier-syntax">listed_in_bp_family</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">BPTerms::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">BPTerms::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">KindSubjects::from_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">K_table</span><span class="plain-syntax">)),</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"listed_in"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"lists-in"</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::new</span><span class="plain-syntax">(</span><span class="string-syntax">"(ct_1=ExistsTableRowCorr(ct_0=*2,%n,*1))"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">RTTableColumns::id_iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">tc</span><span class="plain-syntax">)), </span><span class="identifier-syntax">WordAssemblages::lit_0</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">bp</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>Once again there is a timing constraint. Tables are created quite early
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on in Inform's run, but the entries in the columns aren't parsed until much
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later. Since the kind of value stored in a column is often determined only
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by looking at those values, it follows that we can't specify what goes into
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the left-hand term at the time when the column is created. So we fill this
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in later, instead:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Tables::Relations::supply_kind_for_listed_in_tc</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">Tables::Relations::supply_kind_for_listed_in_tc</span></span>:<br/>Table Columns - <a href="7-tc.html#SP5">§5</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="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">BPTerms::set_domain</span><span class="plain-syntax">(&(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-></span><span class="identifier-syntax">term_details</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">BPTerms::set_domain</span><span class="plain-syntax">(&(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">-></span><span class="identifier-syntax">reversal</span><span class="plain-syntax">-></span><span class="identifier-syntax">term_details</span><span class="plain-syntax">[1]), </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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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. Typechecking. </b></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">Tables::Relations::typecheck</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">Tables::Relations::typecheck</span></span>:<br/><a href="8-lr.html#SP1">§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>
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<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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">DECLINE_TO_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="SP5" class="paragraph-anchor"></a><b>§5. Assertion. </b>These relations cannot be asserted.
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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">Tables::Relations::assert</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">Tables::Relations::assert</span></span>:<br/><a href="8-lr.html#SP1">§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>
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<span class="plain-syntax"> </span><span class="identifier-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>
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<span class="plain-syntax"> </span><span class="identifier-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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. Compilation. </b>Note the side-effect here: we ensure that the <span class="extract"><span class="extract-syntax">ct</span></span> local variables will be
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present in the current stack frame, since we're going to need them to hold
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the table reference for any successful lookup.
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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">Tables::Relations::schema</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">Tables::Relations::schema</span></span>:<br/><a href="8-lr.html#SP1">§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="identifier-syntax">annotated_i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">asch</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">task</span><span class="plain-syntax"> == </span><span class="identifier-syntax">TEST_ATOM_TASK</span><span class="plain-syntax">) </span><span class="identifier-syntax">LocalVariables::add_table_lookup</span><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. Problem message text. </b></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">Tables::Relations::describe_for_problems</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">Tables::Relations::describe_for_problems</span></span>:<br/><a href="8-lr.html#SP1">§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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"the listed in relation"</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">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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