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<!--Weave of 'Kind Predicates Revisited' generated by Inweb-->
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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>Kind Predicates Revisited</b></li></ul></div>
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<p class="purpose">To define how the kind predicates behave in the Inform language.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Recall that for every kind <span class="extract"><span class="extract-syntax">K</span></span> the <a href="../calculus-module/index.html" class="internal">calculus</a> module makes a built-in
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unary predicate <span class="extract"><span class="extract-syntax">kind=K(t)</span></span>, which is true if and only if <span class="extract"><span class="extract-syntax">t</span></span> has kind <span class="extract"><span class="extract-syntax">K</span></span>.
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See <a href="../calculus-module/2-kp.html" class="internal">Kind Predicates (in calculus)</a> for details.
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</p>
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<p class="commentary">In this section, we give this family of UPs the necessary method calls to
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be asserted and compiled from.
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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">KindPredicatesRevisited::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">KindPredicatesRevisited::start</span></span>:<br/>Assertions Module - <a href="1-am.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">kind_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">TYPECHECK_UPF_MTID</span><span class="plain-syntax">, </span><a href="8-kpr.html#SP2" class="function-link"><span class="function-syntax">KindPredicatesRevisited::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">kind_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">ASSERT_UPF_MTID</span><span class="plain-syntax">, </span><a href="8-kpr.html#SP3" class="function-link"><span class="function-syntax">KindPredicatesRevisited::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">kind_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">SCHEMA_UPF_MTID</span><span class="plain-syntax">, </span><a href="8-kpr.html#SP4" class="function-link"><span class="function-syntax">KindPredicatesRevisited::get_schema</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. </b>We will reject any "kind" applied to a constant if it necessarily fails —
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even when the sense of the proposition is arguably correct. For example:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> 1. 100 is not a text</span>
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<span class="plain-syntax"> << NOT< text('100') NOT> >></span>
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<span class="plain-syntax"> Failed: proposition would not type-check</span>
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<span class="plain-syntax"> Term '100' is number not text</span>
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</pre>
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<p class="commentary">"100 is not a number" would pass, on the other hand. It is obviously false,
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but not meaningless.
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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">KindPredicatesRevisited::typecheck</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">KindPredicatesRevisited::typecheck</span></span>:<br/><a href="8-kpr.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">up_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="identifier-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">up</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prop</span><span class="plain-syntax">, </span><span class="identifier-syntax">variable_type_assignment</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vta</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="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax"> = </span><span class="identifier-syntax">up</span><span class="plain-syntax">-></span><span class="identifier-syntax">assert_kind</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">Kinds::Behaviour::is_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax">)) </span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax"> = </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TypecheckPropositions::kind_of_term</span><span class="plain-syntax">(&(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">tck</span><span class="plain-syntax">-></span><span class="identifier-syntax">log_to_I6_text</span><span class="plain-syntax">)</span>
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<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">prop</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TypecheckPropositions::issue_kind_typecheck_error</span><span class="plain-syntax">(</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">need_to_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">, </span><span class="identifier-syntax">prop</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NEVER_MATCH</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ALWAYS_MATCH</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>Note that we never assert the kind of non-objects. Typechecking won't allow such
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an atom to exist unless it states something already true, so there is no need.
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</p>
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<p class="commentary">The problem message here is really quite hard to generate, because the
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A-parser usually gets there first. "There is a banana which is something which
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is not a door." will fall through here, but it isn't exactly an everyday
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sentence.
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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">KindPredicatesRevisited::assert</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">KindPredicatesRevisited::assert</span></span>:<br/><a href="8-kpr.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">up_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="identifier-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">up</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">now_negated</span><span class="plain-syntax">, </span><span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pl</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">now_negated</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_CantAssertNonKind</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say what kind something doesn't have"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"which is too vague. You must say what kind it does have."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">subj</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Assert::subject_of_term</span><span class="plain-syntax">(</span><span class="identifier-syntax">pl</span><span class="plain-syntax">-></span><span class="element-syntax">terms</span><span class="plain-syntax">[0]);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">instance</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ox</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InstanceSubjects::to_object_instance</span><span class="plain-syntax">(</span><span class="identifier-syntax">subj</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">ox</span><span class="plain-syntax">) </span><span class="identifier-syntax">Instances::set_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">ox</span><span class="plain-syntax">, </span><span class="identifier-syntax">up</span><span class="plain-syntax">-></span><span class="identifier-syntax">assert_kind</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax"> = </span><span class="identifier-syntax">KindSubjects::to_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">subj</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">K</span><span class="plain-syntax">) </span><span class="identifier-syntax">Kinds::make_subkind</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="identifier-syntax">up</span><span class="plain-syntax">-></span><span class="identifier-syntax">assert_kind</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>In any type-checked proposition, a "kind" predicate can only exist where it is
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always at least sometimes true. In particular, if \(K\) is a kind of value, then
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the atom \(K(v)\) can only exist where \(v\) is of that kind of value, so that the
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atom is always true when tested. But if \(K\) is a kind of object, then \(K(O)\)
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may occur in the proposition for any object \(O\), where \(O\) need not belong
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to \(K\) at all: so there is something substantive to check, which we do using
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the I6 <span class="extract"><span class="extract-syntax">ofclass</span></span> operator.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">suppress_C14CantChangeKind</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</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">KindPredicatesRevisited::get_schema</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">KindPredicatesRevisited::get_schema</span></span>:<br/><a href="8-kpr.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">up_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">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">up</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">annotated_i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">asch</span><span class="plain-syntax">, </span><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="reserved-syntax">switch</span><span class="plain-syntax">(</span><span class="identifier-syntax">task</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">TEST_ATOM_TASK:</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::Behaviour::is_subkind_of_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">up</span><span class="plain-syntax">-></span><span class="identifier-syntax">assert_kind</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="identifier-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"*1 ofclass %n"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">RTKindDeclarations::iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">up</span><span class="plain-syntax">-></span><span class="identifier-syntax">assert_kind</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">Kinds::get_construct</span><span class="plain-syntax">(</span><span class="identifier-syntax">up</span><span class="plain-syntax">-></span><span class="identifier-syntax">assert_kind</span><span class="plain-syntax">) == </span><span class="identifier-syntax">CON_list_of</span><span class="plain-syntax">) &&</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">problem_count</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">EK</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Kinds::unary_construction_material</span><span class="plain-syntax">(</span><span class="identifier-syntax">up</span><span class="plain-syntax">-></span><span class="identifier-syntax">assert_kind</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">Kinds::Behaviour::is_subkind_of_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">EK</span><span class="plain-syntax">)) {</span>
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<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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_kind</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">up</span><span class="plain-syntax">-></span><span class="identifier-syntax">assert_kind</span><span class="plain-syntax">);</span>
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<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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_CantCheckListContents</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"In %1, you use a list which might or might not match a "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"definition requiring %2. But there's no efficient way to "</span>
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|
<span class="plain-syntax"> </span><span class="string-syntax">"tell during play whether the list actually contains that, "</span>
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|
<span class="plain-syntax"> </span><span class="string-syntax">"without laboriously checking every entry. Because "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"in general this would be a bad idea, this usage is "</span>
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|
<span class="plain-syntax"> </span><span class="string-syntax">"not allowed."</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
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<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="identifier-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"true"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">NOW_ATOM_TRUE_TASK:</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">NOW_ATOM_FALSE_TASK:</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">suppress_C14CantChangeKind</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(),</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_CantChangeKind</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"the kind of something is fixed"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"and cannot be changed during play with a 'now'."</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="identifier-syntax">schema</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-></span><span class="identifier-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">" "</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> }</span>
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|
<span class="plain-syntax">}</span>
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</pre>
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