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68 lines
2.8 KiB
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68 lines
2.8 KiB
HTML
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<head>
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<title>Logtalk built-in method: expand_term/2</title>
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<div class="top-left">Logtalk reference manual</div>
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<div class="top-right">Built-in method: expand_term/2</div>
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<div class="bottom-left"><span class="page"/></div>
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<div class="bottom-right"><span class="page"/></div>
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<div class="navtop"><a href="../../index.html">contents</a> > <a href="../index.html">reference manual</a> > <a href="../index.html#methods">built-in methods</a></div>
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<h2 class="codenp">expand_term/2<span id="methods_expand_term2"/></h2>
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<h4>Description</h4>
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<pre>expand_term(Term, Expansion)</pre>
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<p>
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Expands a term. The most common use is to expand a grammar rule into a clause. Users may override the default Logtalk grammar rule translator by defining clauses for the predicate <a href="term_expansion2.html"><code>term_expansion/2</code></a>.
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</p>
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<p>
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The expansion works as follows: if the first argument is a variable, then it is unified with the second argument; if the first argument is not a variable and clauses for the <code>term_expansion/2</code> predicate are within scope, then this predicate is called to provide an expansion that is then unified with the second argument; if the <code>term_expansion/2</code> predicate is not used and the first argument is a compound term with functor <code>-->/2</code> then the default Logtalk grammar rule translator is used, with the resulting clause being unified with the second argument; when the translator is not used, the two arguments are unified.
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</p>
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<p>
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This built-in method may be used to expand a grammar rule into a clause for use with the built-in database methods.
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</p>
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<h4>Template and modes</h4>
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<pre>expand_term(?term, ?term)</pre>
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<h4>Errors</h4>
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<dl>
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<dt>(none)</dt>
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</dl>
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<h4>Examples</h4>
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<dl>
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<dt>(none)</dt>
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</dl>
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<span>Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://logtalk.org">Logtalk.org</a></span><br/>
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<span>Last updated on: October 26, 2006</span>
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<span><a href="../index.html#methods">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="term_expansion2.html">next</a></span><br/>
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