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<title>15/cr</title>
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<!--Weave of '15/spr' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">★</a></li><li><a href="index.html">core</a></li><li><a href="index.html#15">Chapter 15: Properties</a></li><li><b>Same Property Relation</b></li></ul><p class="purpose">Each value property has an associated relation to compare its value between two holders.</p>
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<ul class="toc"><li><a href="#SP1">§1. Initial stock</a></li><li><a href="#SP2">§2. Second stock</a></li><li><a href="#SP3">§3. Typechecking</a></li><li><a href="#SP4">§4. Assertion</a></li><li><a href="#SP5">§5. Compilation</a></li><li><a href="#SP7">§7. Problem message text</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. Initial stock. </b>There is no initial stock of these, since there are no value properties yet
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when Inform starts up.
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</p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Properties::SameRelations::REL_create_initial_stock</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Properties::SameRelations::REL_create_initial_stock is used in 6/bp (<a href="6-bp.html#SP45">§45</a>).</p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. Second stock. </b>If, for example, there is a value property called "height" then a BP is
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constructed in order to serve as the meaning of "the same height as" in text
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like this:
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</p>
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<blockquote>
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<p>if Ms Cregg is the same height as Big Bird, ...</p>
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</blockquote>
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<p class="inwebparagraph">We again have two schemas, because it makes sense not only to perform
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the comparison but also to force it true thus:
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</p>
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<blockquote>
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<p>now Ms Cregg is the same height as Big Bird;</p>
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</blockquote>
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<p class="inwebparagraph">(That couldn't be arranged for strict inequality comparisons like "taller
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than" because it is unclear just how much taller than Big Bird we would have
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to make C. J.)
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</p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Properties::SameRelations::REL_create_second_stock</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="reserved">property</span><span class="plain"> *</span><span class="identifier">prn</span><span class="plain">;</span>
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<span class="identifier">LOOP_OVER</span><span class="plain">(</span><span class="identifier">prn</span><span class="plain">, </span><span class="reserved">property</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext">Properties::is_value_property</span><span class="plain">(</span><span class="identifier">prn</span><span class="plain">)) {</span>
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<span class="identifier">vocabulary_entry</span><span class="plain"> *</span><span class="identifier">rel_name</span><span class="plain">;</span>
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<span class="identifier">inter_name</span><span class="plain"> *</span><span class="identifier">i6_pname</span><span class="plain"> = </span><span class="functiontext">Properties::iname</span><span class="plain">(</span><span class="identifier">prn</span><span class="plain">);</span>
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<<span class="cwebmacro">Work out the name for the same-property-value-as relation</span> <span class="cwebmacronumber">2.1</span>><span class="plain">;</span>
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<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">relname</span><span class="plain">);</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">relname</span><span class="plain">, </span><span class="string">"%V"</span><span class="plain">, </span><span class="identifier">rel_name</span><span class="plain">);</span>
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<span class="reserved">binary_predicate</span><span class="plain"> *</span><span class="identifier">bp</span><span class="plain"> = </span><span class="functiontext">BinaryPredicates::make_pair</span><span class="plain">(</span><span class="constant">PROPERTY_SAME_KBP</span><span class="plain">,</span>
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<span class="functiontext">BinaryPredicates::new_term</span><span class="plain">(</span><span class="identifier">NULL</span><span class="plain">), </span><span class="functiontext">BinaryPredicates::new_term</span><span class="plain">(</span><span class="identifier">NULL</span><span class="plain">),</span>
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<span class="identifier">relname</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">,</span>
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<span class="functiontext">Calculus::Schemas::new</span><span class="plain">(</span><span class="string">"*1.%n = *2.%n"</span><span class="plain">, </span><span class="identifier">i6_pname</span><span class="plain">, </span><span class="identifier">i6_pname</span><span class="plain">),</span>
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<span class="functiontext">Calculus::Schemas::new</span><span class="plain">(</span><span class="string">"*1.%n == *2.%n"</span><span class="plain">, </span><span class="identifier">i6_pname</span><span class="plain">, </span><span class="identifier">i6_pname</span><span class="plain">),</span>
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<span class="identifier">WordAssemblages::lit_1</span><span class="plain">(</span><span class="identifier">rel_name</span><span class="plain">));</span>
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<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">relname</span><span class="plain">);</span>
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<span class="identifier">bp</span><span class="plain">-</span><span class="element">>same_property</span><span class="plain"> = </span><span class="identifier">prn</span><span class="plain">;</span>
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<span class="functiontext">Properties::SameRelations::register_same_property_as</span><span class="plain">(</span><span class="identifier">bp</span><span class="plain">, </span><span class="functiontext">Properties::get_name</span><span class="plain">(</span><span class="identifier">prn</span><span class="plain">));</span>
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<span class="plain">}</span>
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<span class="plain">}</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Properties::SameRelations::register_same_property_as</span><span class="plain">(</span><span class="constant">VERB_MEANING_TYPE</span><span class="plain"> *</span><span class="identifier">root</span><span class="plain">, </span><span class="identifier">wording</span><span class="plain"> </span><span class="identifier">W</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Wordings::empty</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain">;</span>
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<span class="identifier">set_where_created</span><span class="plain"> = </span><span class="identifier">current_sentence</span><span class="plain">;</span>
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<span class="identifier">verb_meaning</span><span class="plain"> </span><span class="identifier">vm</span><span class="plain"> = </span><span class="identifier">VerbMeanings::new</span><span class="plain">(</span><span class="identifier">root</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">);</span>
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<span class="identifier">preposition_identity</span><span class="plain"> *</span><span class="identifier">prep</span><span class="plain"> =</span>
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<span class="identifier">Prepositions::make</span><span class="plain">(</span>
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<span class="identifier">Preform::Nonparsing::merge</span><span class="plain">(<</span><span class="identifier">same</span><span class="plain">-</span><span class="reserved">property</span><span class="plain">-</span><span class="identifier">as</span><span class="plain">-</span><span class="identifier">construction</span><span class="plain">>, 0,</span>
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<span class="identifier">WordAssemblages::from_wording</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">)), </span><span class="identifier">FALSE</span><span class="plain">);</span>
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<span class="identifier">Verbs::add_form</span><span class="plain">(</span><span class="identifier">copular_verb</span><span class="plain">, </span><span class="identifier">prep</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">vm</span><span class="plain">, </span><span class="identifier">SVO_FS_BIT</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Properties::SameRelations::REL_create_second_stock is used in 6/bp (<a href="6-bp.html#SP46">§46</a>).</p>
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<p class="endnote">The function Properties::SameRelations::register_same_property_as appears nowhere else.</p>
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<p class="inwebparagraph"><a id="SP2_1"></a><b>§2.1. </b>In I7 source text, this relation is called "same-height-as", but we don't
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mention this in the documentation because (for timing reasons) it doesn't
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exist when the new-verb sentences are being parsed: so writing
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</p>
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<blockquote>
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<p>The verb to be level with implies the same-height-as relation.</p>
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</blockquote>
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<p class="inwebparagraph">cannot work. Nothing is really lost by this, since it's easy enough to
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define an identically-behaving relation by hand:
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</p>
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<blockquote>
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<p>Levelling relates a person (called Mr X) to a person (called Mr Y) when the height of Mr X is the height of Mr Y.</p>
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</blockquote>
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<blockquote>
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<p>The verb to be level with implies the levelling relation.</p>
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</blockquote>
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<p class="inwebparagraph">Relations need to have single-word names, but properties don't, so we shrink
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spaces to hyphens: thus, for instance, "same-carrying-capacity-as". We also
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truncate to a reasonable length, ensuring that the result doesn't exceed
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<code class="display"><span class="extract">MAX_WORD_LENGTH</span></code> or overflow our storage for a debugging-log name.
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</p>
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<p class="macrodefinition"><code class="display">
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<<span class="cwebmacrodefn">Work out the name for the same-property-value-as relation</span> <span class="cwebmacronumber">2.1</span>> =
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</code></p>
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<pre class="displaydefn">
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<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">i7_name</span><span class="plain">);</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">i7_name</span><span class="plain">, </span><span class="string">"same-%<W-as"</span><span class="plain">, </span><span class="identifier">prn</span><span class="plain">-</span><span class="element">>name</span><span class="plain">);</span>
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<span class="identifier">LOOP_THROUGH_TEXT</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">, </span><span class="identifier">i7_name</span><span class="plain">)</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Str::get</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">) == </span><span class="character">' '</span><span class="plain">) </span><span class="identifier">Str::put</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">, </span><span class="character">'-'</span><span class="plain">);</span>
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<span class="identifier">wording</span><span class="plain"> </span><span class="identifier">I7W</span><span class="plain"> = </span><span class="identifier">Feeds::feed_stream_expanding_strings</span><span class="plain">(</span><span class="identifier">i7_name</span><span class="plain">);</span>
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<span class="identifier">rel_name</span><span class="plain"> = </span><span class="identifier">Lexer::word</span><span class="plain">(</span><span class="identifier">Wordings::first_wn</span><span class="plain">(</span><span class="identifier">I7W</span><span class="plain">));</span>
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<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">i7_name</span><span class="plain">);</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">This code is used in <a href="#SP2">§2</a>.</p>
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<p class="inwebparagraph"><a id="SP3"></a><b>§3. Typechecking. </b>We just let the standard machinery do its work.
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</p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Properties::SameRelations::REL_typecheck</span><span class="plain">(</span><span class="reserved">binary_predicate</span><span class="plain"> *</span><span class="identifier">bp</span><span class="plain">,</span>
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<span class="identifier">kind</span><span class="plain"> **</span><span class="identifier">kinds_of_terms</span><span class="plain">, </span><span class="identifier">kind</span><span class="plain"> **</span><span class="identifier">kinds_required</span><span class="plain">, </span><span class="reserved">tc_problem_kit</span><span class="plain"> *</span><span class="identifier">tck</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="constant">DECLINE_TO_MATCH</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Properties::SameRelations::REL_typecheck is used in 6/bp (<a href="6-bp.html#SP47">§47</a>).</p>
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<p class="inwebparagraph"><a id="SP4"></a><b>§4. Assertion. </b></p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Properties::SameRelations::REL_assert</span><span class="plain">(</span><span class="reserved">binary_predicate</span><span class="plain"> *</span><span class="identifier">bp</span><span class="plain">,</span>
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<span class="reserved">inference_subject</span><span class="plain"> *</span><span class="identifier">infs0</span><span class="plain">, </span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec0</span><span class="plain">,</span>
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<span class="reserved">inference_subject</span><span class="plain"> *</span><span class="identifier">infs1</span><span class="plain">, </span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">spec1</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Properties::SameRelations::REL_assert is used in 6/bp (<a href="6-bp.html#SP47">§47</a>).</p>
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<p class="inwebparagraph"><a id="SP5"></a><b>§5. Compilation. </b>Again we need do nothing special.
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</p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Properties::SameRelations::REL_compile</span><span class="plain">(</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">task</span><span class="plain">,</span>
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<span class="reserved">binary_predicate</span><span class="plain"> *</span><span class="identifier">bp</span><span class="plain">, </span><span class="reserved">annotated_i6_schema</span><span class="plain"> *</span><span class="identifier">asch</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Properties::SameRelations::REL_compile is used in 6/bp (<a href="6-bp.html#SP47">§47</a>).</p>
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<p class="inwebparagraph"><a id="SP6"></a><b>§6. </b></p>
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<pre class="display">
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<span class="reserved">property</span><span class="plain"> *</span><span class="functiontext">Properties::SameRelations::bp_get_same_as_property</span><span class="plain">(</span><span class="reserved">binary_predicate</span><span class="plain"> *</span><span class="identifier">bp</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">bp</span><span class="plain">-</span><span class="element">>same_property</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Properties::SameRelations::bp_get_same_as_property appears nowhere else.</p>
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<p class="inwebparagraph"><a id="SP7"></a><b>§7. Problem message text. </b></p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Properties::SameRelations::REL_describe_for_problems</span><span class="plain">(</span><span class="identifier">OUTPUT_STREAM</span><span class="plain">, </span><span class="reserved">binary_predicate</span><span class="plain"> *</span><span class="identifier">bp</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Properties::SameRelations::REL_describe_for_problems is used in 6/bp (<a href="6-bp.html#SP47">§47</a>).</p>
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<hr class="tocbar">
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<ul class="toc"><li><a href="15-cr.html">Back to 'Comparative Relations'</a></li><li><a href="15-spr2.html">Continue with 'Setting Property Relation'</a></li></ul><hr class="tocbar">
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<!--End of weave-->
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