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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7 Modules</a></li><li><a href="index.html">if</a></li><li><a href="index.html#3">Chapter 3: Space and Time</a></li><li><b>Everywhere, Nowhere and Here</b></li></ul></div>
<p class="purpose">To define the unary predicates for some anaphoric location adjectives.</p>
<ul class="toc"><li><a href="3-enah.html#SP2">&#167;2. Start</a></li><li><a href="3-enah.html#SP3">&#167;3. Initial stock</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">up_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">everywhere_up_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="identifier-syntax">up_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nowhere_up_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="identifier-syntax">up_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">here_up_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="identifier-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">everywhere_up</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="identifier-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nowhere_up</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="identifier-syntax">unary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">here_up</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. Start. </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">WherePredicates::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">WherePredicates::start</span></span>:<br/>IF Module - <a href="1-im.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">everywhere_up_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">UnaryPredicateFamilies::new</span><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">everywhere_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">STOCK_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP3" class="function-link"><span class="function-syntax">WherePredicates::stock_everywhere</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">everywhere_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">LOG_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP9" class="function-link"><span class="function-syntax">WherePredicates::log_everywhere</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nowhere_up_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">UnaryPredicateFamilies::new</span><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">nowhere_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">STOCK_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP3" class="function-link"><span class="function-syntax">WherePredicates::stock_nowhere</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">nowhere_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">LOG_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP9" class="function-link"><span class="function-syntax">WherePredicates::log_nowhere</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">here_up_family</span><span class="plain-syntax"> = </span><span class="identifier-syntax">UnaryPredicateFamilies::new</span><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">here_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">STOCK_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP3" class="function-link"><span class="function-syntax">WherePredicates::stock_here</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">here_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">LOG_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP9" class="function-link"><span class="function-syntax">WherePredicates::log_here</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">everywhere_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">TYPECHECK_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP3" class="function-link"><span class="function-syntax">WherePredicates::typecheck_everywhere</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">everywhere_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">ASSERT_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP5" class="function-link"><span class="function-syntax">WherePredicates::assert_everywhere</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">everywhere_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">SCHEMA_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP8" class="function-link"><span class="function-syntax">WherePredicates::schema_everywhere</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">nowhere_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">TYPECHECK_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP3" class="function-link"><span class="function-syntax">WherePredicates::typecheck_nowhere</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">nowhere_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">ASSERT_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP6" class="function-link"><span class="function-syntax">WherePredicates::assert_nowhere</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">nowhere_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">SCHEMA_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP8" class="function-link"><span class="function-syntax">WherePredicates::schema_nowhere</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">here_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">TYPECHECK_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP4" class="function-link"><span class="function-syntax">WherePredicates::typecheck_here</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">here_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">ASSERT_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP7" class="function-link"><span class="function-syntax">WherePredicates::assert_here</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">here_up_family</span><span class="plain-syntax">, </span><span class="identifier-syntax">SCHEMA_UPF_MTID</span><span class="plain-syntax">, </span><a href="3-enah.html#SP9" class="function-link"><span class="function-syntax">WherePredicates::schema_here</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. Initial stock. </b>This relation is hard-wired in, and it is made in a slightly special way
since (alone among binary predicates) it has no distinct reversal.
</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">WherePredicates::stock_everywhere</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">WherePredicates::stock_everywhere</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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">n</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">n</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">everywhere_up</span><span class="plain-syntax"> = </span><span class="identifier-syntax">UnaryPredicates::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">everywhere_up_family</span><span class="plain-syntax">);</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">WherePredicates::stock_nowhere</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">WherePredicates::stock_nowhere</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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">n</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">n</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">nowhere_up</span><span class="plain-syntax"> = </span><span class="identifier-syntax">UnaryPredicates::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">nowhere_up_family</span><span class="plain-syntax">);</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">WherePredicates::stock_here</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">WherePredicates::stock_here</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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">n</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">n</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">here_up</span><span class="plain-syntax"> = </span><span class="identifier-syntax">UnaryPredicates::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">here_up_family</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="function-syntax">WherePredicates::everywhere_up</span><span class="plain-syntax">(</span><span class="identifier-syntax">pcalc_term</span><span class="plain-syntax"> </span><span class="identifier-syntax">t</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">Atoms::unary_PREDICATE_new</span><span class="plain-syntax">(</span><span class="identifier-syntax">everywhere_up</span><span class="plain-syntax">, </span><span class="identifier-syntax">t</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="function-syntax">WherePredicates::nowhere_up</span><span class="plain-syntax">(</span><span class="identifier-syntax">pcalc_term</span><span class="plain-syntax"> </span><span class="identifier-syntax">t</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">Atoms::unary_PREDICATE_new</span><span class="plain-syntax">(</span><span class="identifier-syntax">nowhere_up</span><span class="plain-syntax">, </span><span class="identifier-syntax">t</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="function-syntax">WherePredicates::here_up</span><span class="plain-syntax">(</span><span class="identifier-syntax">pcalc_term</span><span class="plain-syntax"> </span><span class="identifier-syntax">t</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">Atoms::unary_PREDICATE_new</span><span class="plain-syntax">(</span><span class="identifier-syntax">here_up</span><span class="plain-syntax">, </span><span class="identifier-syntax">t</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">WherePredicates::typecheck_everywhere</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">WherePredicates::typecheck_everywhere</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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>
<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>
<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">Propositions::Checker::kind_of_term</span><span class="plain-syntax">(&amp;(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">tck</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">log_to_I6_text</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Term $0 is %u not an object\n"</span><span class="plain-syntax">, &amp;(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_kind</span><span class="plain-syntax">(4, </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::tcp_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_EverywhereMisapplied</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say that a value - specifically, %4 - is everywhere. "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"To Inform, everywhere means 'in every room', and only objects "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"can be everywhere - in fact not even all of those, as it's a "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"privilege reserved for backdrops. (For instance, 'The sky is a "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"backdrop. The sky is everywhere.' is allowed.)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NEVER_MATCH</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ALWAYS_MATCH</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">WherePredicates::typecheck_nowhere</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">WherePredicates::typecheck_nowhere</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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>
<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>
<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">Propositions::Checker::kind_of_term</span><span class="plain-syntax">(&amp;(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">tck</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">log_to_I6_text</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Term $0 is %u not an object\n"</span><span class="plain-syntax">, &amp;(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_kind</span><span class="plain-syntax">(4, </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::tcp_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_NowhereMisapplied</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say that a value - specifically, %4 - is nowhere. "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"To Inform, nowhere means 'in no room', and only things can be "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"nowhere. (For instance, 'Godot is nowhere.' is allowed - it means "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"Godot exists, but is not initially part of the drama.)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NEVER_MATCH</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ALWAYS_MATCH</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b>It seems to be true that Inform never generates propositions which
apply "here" incorrectly, but just in case:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">WherePredicates::typecheck_here</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">WherePredicates::typecheck_here</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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>
<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>
<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">Propositions::Checker::kind_of_term</span><span class="plain-syntax">(&amp;(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">vta</span><span class="plain-syntax">, </span><span class="identifier-syntax">tck</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::compatible</span><span class="plain-syntax">(</span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NEVER_MATCH</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">tck</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">log_to_I6_text</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Term $0 is %u not an object\n"</span><span class="plain-syntax">, &amp;(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0]), </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_kind</span><span class="plain-syntax">(4, </span><span class="identifier-syntax">actually_find</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::tcp_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">BelievedImpossible</span><span class="plain-syntax">), </span><span class="identifier-syntax">tck</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say that a value - specifically, %4 - is here. "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"To Inform, here means 'in the room we're talking about', so only "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"objects can be 'here'."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NEVER_MATCH</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ALWAYS_MATCH</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. </b>EVERYWHERE declares that something is found
in every room. While we could simply deduce that the object must be a
backdrop (and set the kind to make it so), this is such an extreme business,
so rarely needed, that it seems better to make the user spell out that
we're dealing with a backdrop. So we play dumb.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">WherePredicates::assert_everywhere</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">WherePredicates::assert_everywhere</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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>
<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">prop</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">now_negated</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>
<span class="plain-syntax"> </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_CantAssertNegatedEverywhere</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say that something isn't everywhere"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"which is too vague. You must say where it is."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="constant-syntax">IF_MODULE</span>
<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">Propositions::Assert::subject_of_term</span><span class="plain-syntax">(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0]);</span>
<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">InferenceSubjects::as_object_instance</span><span class="plain-syntax">(</span><span class="identifier-syntax">subj</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-bck.html#SP16" class="function-link"><span class="function-syntax">PL::Backdrops::infer_presence_everywhere</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ox</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
<span class="plain-syntax">}</span>
<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. </b>NOWHERE is similar:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">WherePredicates::assert_nowhere</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">WherePredicates::assert_nowhere</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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>
<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">prop</span><span class="plain-syntax">) {</span>
<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">Propositions::Assert::subject_of_term</span><span class="plain-syntax">(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0]);</span>
<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">InferenceSubjects::as_object_instance</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">now_negated</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><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">BelievedImpossible</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say that something isn't nowhere"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"which is too vague. You must say where it is."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</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">ox</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">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">BelievedImpossible</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say that something generic is 'nowhere'"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"which suggests it could some day have a physical location."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="constant-syntax">IF_MODULE</span>
<span class="plain-syntax"> </span><a href="3-sm.html#SP27" class="function-link"><span class="function-syntax">PL::Spatial::infer_presence_nowhere</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ox</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
<span class="plain-syntax">}</span>
<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
</pre>
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>&#167;7. </b>HERE means "this object is in the current room", which is not as easy to
resolve as it looks, because at this point we don't know for certain what
will be a room and what won't. So we record a special inference and put the
problem aside for now.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">WherePredicates::assert_here</span><button class="popup" onclick="togglePopup('usagePopup10')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup10">Usage of <span class="code-font"><span class="function-syntax">WherePredicates::assert_here</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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>
<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">prop</span><span class="plain-syntax">) {</span>
<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">Propositions::Assert::subject_of_term</span><span class="plain-syntax">(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">terms</span><span class="plain-syntax">[0]);</span>
<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">InferenceSubjects::as_object_instance</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">now_negated</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><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">BelievedImpossible</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say that something isn't here"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"which is too vague. You must say where it is."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</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">ox</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">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_NonInstanceHere</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="string-syntax">"that seems to say that something generic is 'here'"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"which would give it a physical location. (It would be like saying "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"'A number is here' - well, numbers are everywhere and nowhere.)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="constant-syntax">IF_MODULE</span>
<span class="plain-syntax"> </span><a href="3-sm.html#SP26" class="function-link"><span class="function-syntax">PL::Spatial::infer_presence_here</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ox</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
<span class="plain-syntax">}</span>
<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
</pre>
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>&#167;8. </b>Note that <span class="extract"><span class="extract-syntax">FoundEverywhere</span></span> is a template routine existing
to provide a common value of the I6 <span class="extract"><span class="extract-syntax">found_in</span></span> property &mdash; common that is
to all backdrops which are currently everywhere.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">WherePredicates::schema_everywhere</span><button class="popup" onclick="togglePopup('usagePopup11')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup11">Usage of <span class="code-font"><span class="function-syntax">WherePredicates::schema_everywhere</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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>
<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>
<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>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">TEST_ATOM_TASK:</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"BackdropEverywhere(*1)"</span><span class="plain-syntax">);</span>
<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="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"MoveObject(*1, FoundEverywhere); MoveFloatingObjects();"</span><span class="plain-syntax">);</span>
<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_FALSE_TASK:</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><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_CantChangeEverywhere</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="string-syntax">"not being 'everywhere' is not something which can be changed "</span>
<span class="plain-syntax"> </span><span class="string-syntax">"during play using 'now'"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"because it's not exact enough about what needs to be done."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">schema</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="reserved-syntax">break</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">endif</span>
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">WherePredicates::schema_nowhere</span><button class="popup" onclick="togglePopup('usagePopup12')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup12">Usage of <span class="code-font"><span class="function-syntax">WherePredicates::schema_nowhere</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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>
<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>
<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>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">TEST_ATOM_TASK:</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"LocationOf(*1) == nothing"</span><span class="plain-syntax">);</span>
<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="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"RemoveFromPlay(*1);"</span><span class="plain-syntax">);</span>
<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_FALSE_TASK:</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"MoveObject(*1, real_location, 1, false);"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">break</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">endif</span>
</pre>
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>&#167;9. </b>In fact, at present "here" predicates are never included in propositions to
be compiled, so this code is never used.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">WherePredicates::schema_here</span><button class="popup" onclick="togglePopup('usagePopup13')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup13">Usage of <span class="code-font"><span class="function-syntax">WherePredicates::schema_here</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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>
<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>
<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>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">TEST_ATOM_TASK:</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Calculus::Schemas::modify</span><span class="plain-syntax">(</span><span class="identifier-syntax">asch</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">schema</span><span class="plain-syntax">, </span><span class="string-syntax">"LocationOf(*1) == location"</span><span class="plain-syntax">);</span>
<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>
<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">BelievedImpossible</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="string-syntax">"being 'here' is not something which can be changed during play"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"so it cannot be brought about or cancelled out with 'now'."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">asch</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">schema</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="reserved-syntax">break</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">endif</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">WherePredicates::log_everywhere</span><button class="popup" onclick="togglePopup('usagePopup14')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup14">Usage of <span class="code-font"><span class="function-syntax">WherePredicates::log_everywhere</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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">OUTPUT_STREAM</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>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"everywhere"</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">WherePredicates::log_nowhere</span><button class="popup" onclick="togglePopup('usagePopup15')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup15">Usage of <span class="code-font"><span class="function-syntax">WherePredicates::log_nowhere</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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">OUTPUT_STREAM</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>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"nowhere"</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">WherePredicates::log_here</span><button class="popup" onclick="togglePopup('usagePopup16')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup16">Usage of <span class="code-font"><span class="function-syntax">WherePredicates::log_here</span></span>:<br/><a href="3-enah.html#SP2">&#167;2</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">OUTPUT_STREAM</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>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"here"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
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