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<!--Weave of 'To Be and To Have' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7 Modules</a></li><li><a href="index.html">core</a></li><li><a href="index.html#9">Chapter 9: The A-Parser</a></li><li><b>To Be and To Have</b></li></ul></div>
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<p class="purpose">To handle sentences with primary verb "to be" or "to have".</p>
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<ul class="toc"><li><a href="9-tbath.html#SP1">§1. Definitions</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1"></a><b>§1. Definitions. </b></p>
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<p class="commentary firstcommentary"><a id="SP2"></a><b>§2. </b>"To Be and To Have" ought to be the name of an incomprehensible
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book by Sartre which dismisses Heidegger's seminal "To Have and To Be",
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or something like that, but instead it is the name of a section which contains
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the most important sentence handler: the one for assertions.
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</p>
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<p class="commentary">This will turn out to be quite a lot of work, occupying four sections of
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code in all. For etymological reasons, the English verb "to be" is a mixture
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of several different verbs which have blurred together into one: consider "I
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am 5", "I am happy" and "I am Chloe". Even the definition occupies some
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12 columns of the "Oxford English Dictionary" and they make interesting
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reading in clarifying the problem. Most computer programming languages
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implement only <span class="extract"><span class="extract-syntax">=</span></span> and <span class="extract"><span class="extract-syntax">==</span></span>, which correspond to OED's meaning 10, "to exist
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as the thing known by a certain name; to be identical with". But Inform
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implements a much broader set of meanings. For example, its distinction
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between spatial and property knowledge reflects the OED's distinction between
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meanings 5a ("to have or occupy a place somewhere") and 9b ("to have a
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place among the things distinguished by a specified quality") respectively.
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</p>
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<p class="commentary firstcommentary"><a id="SP3"></a><b>§3. </b>Here, and in the sections which follow, we conventionally write <span class="extract"><span class="extract-syntax">px</span></span> and
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<span class="extract"><span class="extract-syntax">py</span></span> for the subtrees representing subject and object sides of the verb. Thus
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</p>
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<blockquote>
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<p>The white marble is in the bamboo box.</p>
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</blockquote>
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<p class="commentary">will result in <span class="extract"><span class="extract-syntax">px</span></span> representing "white marble" and <span class="extract"><span class="extract-syntax">py</span></span> "in the bamboo
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box" (not just a leaf, since it will be a tree showing the containment
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relationship as well as the noun).
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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">Assertions::Copular::assertion</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">Assertions::Copular::assertion</span></span>:<br/>Traverse for Assertions - <a href="9-tfa.html#SP9_2">§9.2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pv</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><a href="9-tbath.html#SP3" class="function-link"><span class="function-syntax">Assertions::Copular::possessive</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pv</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="9-tbath.html#SP4" class="function-link"><span class="function-syntax">Assertions::Copular::to_have</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pv</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><a href="9-tbath.html#SP3" class="function-link"><span class="function-syntax">Assertions::Copular::to_be</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pv</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">, </span><span class="identifier-syntax">pv</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Assertions::Copular::possessive</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">Assertions::Copular::possessive</span></span>:<br/>Property Sentences - <a href="15-ps.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">py</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">py</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">) == </span><span class="identifier-syntax">RELATIONSHIP_NT</span><span class="plain-syntax">) &&</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_relationship</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">)) &&</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_relationship</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">)-></span><span class="element-syntax">reversal</span><span class="plain-syntax"> == </span><span class="constant-syntax">VERB_MEANING_POSSESSION</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Assertions::Copular::to_be</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">Assertions::Copular::to_be</span></span>:<br/><a href="9-tbath.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">px</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">py</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">Wordings::length</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">)) > </span><span class="constant-syntax">1</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> && (</span><span class="identifier-syntax">Vocabulary::test_flags</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">)), </span><span class="identifier-syntax">TEXT_MC</span><span class="plain-syntax">+</span><span class="identifier-syntax">TEXTWITHSUBS_MC</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><a href="1-wtc.html#SP5" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_TextNotClosing</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"it looks as if perhaps you did not intend that to read as a "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"single sentence"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"and possibly the text in quotes was supposed to stand as "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"as a sentence on its own? (The convention is that if text "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"ends in a full stop, exclamation or question mark, perhaps "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"with a close bracket or quotation mark involved as well, then "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"that punctuation mark also closes the sentence to which the "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"text belongs: but otherwise the words following the quoted "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"text are considered part of the same sentence.)"</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><a href="9-tbath.html#SP5" class="function-link"><span class="function-syntax">Assertions::Copular::make_assertion</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">, </span><span class="identifier-syntax">py</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4"></a><b>§4. </b>"To have" may seem as if it ought to be an entirely different verb from
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"to be", but in fact they have heavily overlapping meanings, and we will
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implement them with a great deal of common code. (English is unusual in the
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way that "to be" has taken over some of the functions which "to have"
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has in other languages — compare the French "j'ai fatigu\'e", literally
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"I have tired" rather than "I am tired", which is arguably more logical
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since it talks about the possession of a property.)
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</p>
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<p class="commentary">On traverse 1 we therefore alter the tree judiciously to convert any use of
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"to have" into a use of "to be"; it follows that <span class="extract"><span class="extract-syntax">Assertions::Copular::to_have</span></span> can never be
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called in traverse 2, when there are no uses of "to have" left in the tree.
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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">Assertions::Copular::to_have</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">Assertions::Copular::to_have</span></span>:<br/><a href="9-tbath.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pv</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">px</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pv</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">py</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pv</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-tbath.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Reject two ungrammatical forms of "to have"</span><span class="named-paragraph-number">4.1</span></a></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">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">) == </span><span class="identifier-syntax">CALLED_NT</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-tbath.html#SP4_2" class="named-paragraph-link"><span class="named-paragraph">Handle "X has an A called B"</span><span class="named-paragraph-number">4.2</span></a></span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="function-syntax"><k-kind></span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">)))</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-tbath.html#SP4_3" class="named-paragraph-link"><span class="named-paragraph">Handle "X has a V" where V is a kind of value which is also a property</span><span class="named-paragraph-number">4.3</span></a></span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-tbath.html#SP4_4" class="named-paragraph-link"><span class="named-paragraph">Handle "X has P" where P is a list of properties</span><span class="named-paragraph-number">4.4</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">pv</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><span class="identifier-syntax">py</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="9-tbath.html#SP3" class="function-link"><span class="function-syntax">Assertions::Copular::to_be</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">, </span><span class="identifier-syntax">py</span><span class="plain-syntax">); </span><span class="comment-syntax"> and start again as if it had never been possessive</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_1"></a><b>§4.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Reject two ungrammatical forms of "to have"</span><span class="named-paragraph-number">4.1</span></span><span class="comment-syntax"> =</span>
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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"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">) == </span><span class="constant-syntax">X_OF_Y_NT</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><a href="1-wtc.html#SP5" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_SuperfluousOf</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"the 'of' here appears superfluous"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"assuming the sentence aims to give a property value of something. "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"(For instance, if we want to declare the carrying capacity of "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"something, the normal Inform practice is to say 'The box has "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"carrying capacity 10' rather than 'The box has a carrying capacity "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"of 10'.)"</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">) == </span><span class="identifier-syntax">WITH_NT</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP5" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_SuperfluousWith</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"the 'has ... with' here appears to be a mixture of two ways to "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"give something properties"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that is, 'The box is a container with capacity 10.' and 'The box "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"has capacity 10.'"</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>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-tbath.html#SP4">§4</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4_2"></a><b>§4.2. </b>Here <span class="extract"><span class="extract-syntax">py</span></span> is a <span class="extract"><span class="extract-syntax">CALLED_NT</span></span> subtree for "an A called B", which we relabel
|
|
as a <span class="extract"><span class="extract-syntax">PROPERTYCALLED_NT</span></span> subtree and hang beneath an <span class="extract"><span class="extract-syntax">ALLOWED_NT</span></span> node.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Handle "X has an A called B"</span><span class="named-paragraph-number">4.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wordings::match</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">), </span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">))) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP5" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_SuperfluousCalled</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"'called' should be used only when the name is different from the kind"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"so this sentence should be simplified. For example, 'A door has a "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"colour called colour' should be written more simply as 'A door has "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"a colour'; but 'called' can be used for something like 'A door has "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"a number called the street number'."</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="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Node::set_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">, </span><span class="constant-syntax">PROPERTYCALLED_NT</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">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">) == </span><span class="identifier-syntax">AND_NT</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">L</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::left_edge_of</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">R</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::right_edge_of</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="function-syntax"><np-articled></span><span class="plain-syntax">(</span><span class="identifier-syntax">Wordings::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">L</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pn</span><span class="plain-syntax"> = </span><span class="function-syntax"><<rp>></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pn</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="identifier-syntax">next</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax"> = </span><span class="identifier-syntax">pn</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">"Thus $T"</span><span class="plain-syntax">, </span><span class="identifier-syntax">py</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">px</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::new</span><span class="plain-syntax">(</span><span class="constant-syntax">ALLOWED_NT</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">px</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax"> = </span><span class="identifier-syntax">py</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">prohibited</span><span class="plain-syntax"> = </span><span class="function-syntax"><prohibited-property-owners></span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">px</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">prohibited</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="function-syntax"><np-articled-list>(Node::get_text(py->down-></span><span class="element-syntax">next</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><span class="function-syntax"><<rp>></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">py</span><span class="plain-syntax"> = </span><span class="identifier-syntax">px</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-tbath.html#SP4">§4</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4_3"></a><b>§4.3. </b>More directly, here we simply relegate <span class="extract"><span class="extract-syntax">py</span></span> by hanging it from a new <span class="extract"><span class="extract-syntax">ALLOWED_NT</span></span>
|
|
node. This is for something like
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>A thing has a colour.</p>
|
|
</blockquote>
|
|
|
|
<p class="commentary">where "colour" is the name of both a kind of value and (soon) a property.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Handle "X has a V" where V is a kind of value which is also a property</span><span class="named-paragraph-number">4.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">px</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::new</span><span class="plain-syntax">(</span><span class="constant-syntax">ALLOWED_NT</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">px</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax"> = </span><span class="identifier-syntax">py</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">py</span><span class="plain-syntax"> = </span><span class="identifier-syntax">px</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-tbath.html#SP4">§4</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4_4"></a><b>§4.4. </b>And here we just mark <span class="extract"><span class="extract-syntax">py</span></span> as a property list. Typically the sentence would
|
|
be "The player has carrying capacity 7."
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Handle "X has P" where P is a list of properties</span><span class="named-paragraph-number">4.4</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Node::set_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">, </span><span class="identifier-syntax">PROPERTY_LIST_NT</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-tbath.html#SP4">§4</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5"></a><b>§5. </b>In either case, then, we end up going through <span class="extract"><span class="extract-syntax">Assertions::Copular::to_be</span></span> and then to the
|
|
following routine, which asserts that subtree <span class="extract"><span class="extract-syntax">px</span></span> "is" <span class="extract"><span class="extract-syntax">py</span></span>.
|
|
</p>
|
|
|
|
<p class="commentary">During traverse 1, this takes place in a three-stage process:
|
|
</p>
|
|
|
|
<ul class="items"><li>(a) The two subtrees are each individually "refined", which clarifies the
|
|
meaning of the noun phrases used in them, and tidies up the tree (see
|
|
"Refine Parse Tree").
|
|
</li><li>(b) The Creator is invited to create new objects, variables and so on to
|
|
ensure that unrecognised noun phrases are made meaningful (see "The Creator").
|
|
</li><li>(c) In a "there is X" sentence, where <span class="extract"><span class="extract-syntax">px</span></span> is a meaningless placeholder,
|
|
we cause X to be created, but otherwise do nothing; otherwise, we call
|
|
the massive <span class="extract"><span class="extract-syntax">Assertions::Maker::make_assertion_recursive</span></span> routine (see "Make Assertions").
|
|
</li></ul>
|
|
<p class="commentary">In traverse 2, only (c) takes place; (a) and (b) are one-time events.
|
|
</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">Assertions::Copular::make_assertion</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">Assertions::Copular::make_assertion</span></span>:<br/><a href="9-tbath.html#SP3">§3</a><br/>Tables of Definitions - <a href="19-tod.html#SP6_3">§6.3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">px</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">py</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">traverse</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</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">pc</span><span class="plain-syntax"> = </span><span class="identifier-syntax">problem_count</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (!(</span><span class="function-syntax"><np-existential></span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">))))</span>
|
|
<span class="plain-syntax"> </span><a href="9-rpt.html#SP8" class="function-link"><span class="function-syntax">Assertions::Refiner::refine</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">, </span><span class="constant-syntax">ALLOW_CREATION</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="9-rpt.html#SP8" class="function-link"><span class="function-syntax">Assertions::Refiner::refine</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">, </span><span class="constant-syntax">ALLOW_CREATION</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">problem_count</span><span class="plain-syntax"> > </span><span class="identifier-syntax">pc</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="9-tc.html#SP1" class="function-link"><span class="function-syntax">Assertions::Creator::consult_the_creator</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">, </span><span class="identifier-syntax">py</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</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">SyntaxTree::is_trace_set</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP5" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">())) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"$T"</span><span class="plain-syntax">, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="function-syntax"><np-existential></span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">px</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">traverse</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><a href="9-tbath.html#SP7" class="function-link"><span class="function-syntax">Assertions::Copular::make_existential_assertion</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">px</span><span class="plain-syntax"> = </span><span class="identifier-syntax">py</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><a href="9-ma.html#SP3" class="function-link"><span class="function-syntax">Assertions::Maker::make_assertion_recursive</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">, </span><span class="identifier-syntax">py</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-tbath.html#SP5_1" class="named-paragraph-link"><span class="named-paragraph">Change the discussion topic for subsequent sentences</span><span class="named-paragraph-number">5.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5_1"></a><b>§5.1. </b>The slight asymmetry in what follows is partly pragmatic, partly the result
|
|
of subject-verb inversion ("in the bag is the ball" not "the ball is in the
|
|
bag"). We extract a subject from a relationship node on the left, but not on
|
|
the right, and we don't extract an object from one. Consider:
|
|
</p>
|
|
|
|
<blockquote>
|
|
<p>A billiards table is in the Gazebo. On it is a trophy cup.</p>
|
|
</blockquote>
|
|
|
|
<p class="commentary">What does "it" mean, and why? A human reader goes for the billiards table at
|
|
once, because it seems more likely as a supporter than the Gazebo, but that's
|
|
not how Inform gets the same answer. It all hangs on "billiards table" being
|
|
the object of the first sentence, not the Gazebo; if we descended the RHS,
|
|
which is <span class="extract"><span class="extract-syntax">RELATIONSHIP_NT -> PROPER_NOUN_NT</span></span> pointing to the Gazebo, that's the
|
|
conclusion we would have reached.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Change the discussion topic for subsequent sentences</span><span class="named-paragraph-number">5.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infsx</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">infsy</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">infsy_full</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">infsx</span><span class="plain-syntax"> = </span><a href="9-tbath.html#SP6" class="function-link"><span class="function-syntax">Assertions::Copular::discussed_at_node</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">infsy_full</span><span class="plain-syntax"> = </span><a href="9-tbath.html#SP6" class="function-link"><span class="function-syntax">Assertions::Copular::discussed_at_node</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">py</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">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">) != </span><span class="identifier-syntax">KIND_NT</span><span class="plain-syntax">) </span><span class="identifier-syntax">infsy</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::get_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="9-tfa.html#SP12" class="function-link"><span class="function-syntax">Assertions::Traverse::change_discussion_topic</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infsx</span><span class="plain-syntax">, </span><span class="identifier-syntax">infsy</span><span class="plain-syntax">, </span><span class="identifier-syntax">infsy_full</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">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">) == </span><span class="identifier-syntax">AND_NT</span><span class="plain-syntax">) </span><a href="9-tfa.html#SP13" class="function-link"><span class="function-syntax">Assertions::Traverse::subject_of_discussion_a_list</span></a><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">Annotations::read_int</span><span class="plain-syntax">(</span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">, </span><span class="constant-syntax">clears_pronouns_ANNOT</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="9-tfa.html#SP12" class="function-link"><span class="function-syntax">Assertions::Traverse::new_discussion</span></a><span class="plain-syntax">();</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="9-tbath.html#SP5">§5</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP6"></a><b>§6. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="function-syntax">Assertions::Copular::discussed_at_node</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">Assertions::Copular::discussed_at_node</span></span>:<br/><a href="9-tbath.html#SP5_1">§5.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pn</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</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">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">) != </span><span class="identifier-syntax">KIND_NT</span><span class="plain-syntax">) </span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::get_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</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">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">) == </span><span class="identifier-syntax">RELATIONSHIP_NT</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">pn</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">) &&</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">) == </span><span class="identifier-syntax">PROPER_NOUN_NT</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::get_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">-></span><span class="element-syntax">down</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">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">) == </span><span class="identifier-syntax">WITH_NT</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">pn</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">) &&</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">) == </span><span class="identifier-syntax">PROPER_NOUN_NT</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">infs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::get_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">pn</span><span class="plain-syntax">-></span><span class="element-syntax">down</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">infs</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP7"></a><b>§7. </b></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">Assertions::Copular::make_existential_assertion</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">Assertions::Copular::make_existential_assertion</span></span>:<br/><a href="9-tbath.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">py</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">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">) == </span><span class="identifier-syntax">WITH_NT</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="9-tbath.html#SP7" class="function-link"><span class="function-syntax">Assertions::Copular::make_existential_assertion</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">) == </span><span class="identifier-syntax">AND_NT</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="9-tbath.html#SP7" class="function-link"><span class="function-syntax">Assertions::Copular::make_existential_assertion</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="9-tbath.html#SP7" class="function-link"><span class="function-syntax">Assertions::Copular::make_existential_assertion</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">) == </span><span class="identifier-syntax">COMMON_NOUN_NT</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><a href="16-is.html#SP20" class="function-link"><span class="function-syntax">InferenceSubjects::is_a_kind_of_object</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">))) ||</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::Compare::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">K_object</span><span class="plain-syntax">, </span><a href="16-is.html#SP19" class="function-link"><span class="function-syntax">InferenceSubjects::as_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">)))))</span>
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<span class="plain-syntax"> </span><a href="9-tc.html#SP8" class="function-link"><span class="function-syntax">Assertions::Creator::convert_instance_to_nounphrase</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP5" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_ThereIsVague</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"'there is...' can only be used to create objects"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"and not instances of other kinds.'"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
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</pre>
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