113 lines
5.4 KiB
HTML
113 lines
5.4 KiB
HTML
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>SRFI-88 (Guile Reference Manual)</title>
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<div class="subsection-level-extent" id="SRFI_002d88">
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<p>
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Next: <a href="SRFI_002d98.html" accesskey="n" rel="next">SRFI-98 Accessing environment variables.</a>, Previous: <a href="SRFI_002d87.html" accesskey="p" rel="prev">SRFI-87 => in case clauses</a>, Up: <a href="SRFI-Support.html" accesskey="u" rel="up">SRFI Support Modules</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsection" id="SRFI_002d88-Keyword-Objects"><span>7.5.42 SRFI-88 Keyword Objects<a class="copiable-link" href="#SRFI_002d88-Keyword-Objects"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-SRFI_002d88"></a>
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<a class="index-entry-id" id="index-keyword-objects"></a>
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<p><a class="uref" href="http://srfi.schemers.org/srfi-88/srfi-88.html">SRFI-88</a> provides
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<em class="dfn">keyword objects</em>, which are equivalent to Guile’s keywords
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(see <a class="pxref" href="Keywords.html">Keywords</a>). SRFI-88 keywords can be entered using the
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<em class="dfn">postfix keyword syntax</em>, which consists of an identifier followed
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by <code class="code">:</code> (see <a class="pxref" href="Scheme-Read.html"><code class="code">postfix</code> keyword syntax</a>).
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SRFI-88 can be made available with:
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</p>
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<div class="example">
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<pre class="example-preformatted">(use-modules (srfi srfi-88))
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</pre></div>
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<p>Doing so installs the right reader option for keyword syntax, using
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<code class="code">(read-set! keywords 'postfix)</code>. It also provides the procedures
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described below.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-keyword_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">keyword?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-keyword_003f-1"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if <var class="var">obj</var> is a keyword. This is the same procedure
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as the same-named built-in procedure (see <a class="pxref" href="Keyword-Procedures.html"><code class="code">keyword?</code></a>).
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</p>
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<div class="example">
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<pre class="example-preformatted">(keyword? foo:) ⇒ #t
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(keyword? 'foo:) ⇒ #t
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(keyword? "foo") ⇒ #f
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</pre></div>
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</dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-keyword_002d_003estring"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">keyword->string</strong> <var class="def-var-arguments">kw</var><a class="copiable-link" href="#index-keyword_002d_003estring"> ¶</a></span></dt>
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<dd><p>Return the name of <var class="var">kw</var> as a string, i.e., without the trailing
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colon. The returned string may not be modified, e.g., with
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<code class="code">string-set!</code>.
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</p>
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<div class="example">
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<pre class="example-preformatted">(keyword->string foo:) ⇒ "foo"
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</pre></div>
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</dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-string_002d_003ekeyword"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string->keyword</strong> <var class="def-var-arguments">str</var><a class="copiable-link" href="#index-string_002d_003ekeyword"> ¶</a></span></dt>
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<dd><p>Return the keyword object whose name is <var class="var">str</var>.
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</p>
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<div class="example">
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<pre class="example-preformatted">(keyword->string (string->keyword "a b c")) ⇒ "a b c"
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</pre></div>
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</dd></dl>
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</div>
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