120 lines
7.3 KiB
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120 lines
7.3 KiB
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<!DOCTYPE html>
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>Internal Macros (Guile Reference Manual)</title>
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Macros.html" rel="up" title="Macros">
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<link href="Hygiene-and-the-Top_002dLevel.html" rel="prev" title="Hygiene and the Top-Level">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="Internal-Macros">
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<div class="nav-panel">
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<p>
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Previous: <a href="Hygiene-and-the-Top_002dLevel.html" accesskey="p" rel="prev">Hygiene and the Top-Level</a>, Up: <a href="Macros.html" accesskey="u" rel="up">Macros</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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</div>
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<hr>
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<h4 class="subsection" id="Internal-Macros-1"><span>6.8.11 Internal Macros<a class="copiable-link" href="#Internal-Macros-1"> ¶</a></span></h4>
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<dl class="first-deffn">
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<dt class="deffn" id="index-make_002dsyntax_002dtransformer"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-syntax-transformer</strong> <var class="def-var-arguments">name type binding</var><a class="copiable-link" href="#index-make_002dsyntax_002dtransformer"> ¶</a></span></dt>
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<dd><p>Construct a syntax transformer object. This is part of Guile’s low-level support
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for syntax-case.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-macro_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">macro?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-macro_003f"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fmacro_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_macro_p</strong> <var class="def-var-arguments">(obj)</var><a class="copiable-link" href="#index-scm_005fmacro_005fp"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if <var class="var">obj</var> is a syntax transformer, or <code class="code">#f</code>
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otherwise.
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</p>
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<p>Note that it’s a bit difficult to actually get a macro as a first-class object;
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simply naming it (like <code class="code">case</code>) will produce a syntax error. But it is
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possible to get these objects using <code class="code">module-ref</code>:
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</p>
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<div class="example">
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<pre class="example-preformatted">(macro? (module-ref (current-module) 'case))
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⇒ #t
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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-macro_002dtype"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">macro-type</strong> <var class="def-var-arguments">m</var><a class="copiable-link" href="#index-macro_002dtype"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fmacro_005ftype"><span class="category-def">C Function: </span><span><strong class="def-name">scm_macro_type</strong> <var class="def-var-arguments">(m)</var><a class="copiable-link" href="#index-scm_005fmacro_005ftype"> ¶</a></span></dt>
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<dd><p>Return the <var class="var">type</var> that was given when <var class="var">m</var> was constructed, via
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<code class="code">make-syntax-transformer</code>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-macro_002dname"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">macro-name</strong> <var class="def-var-arguments">m</var><a class="copiable-link" href="#index-macro_002dname"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fmacro_005fname"><span class="category-def">C Function: </span><span><strong class="def-name">scm_macro_name</strong> <var class="def-var-arguments">(m)</var><a class="copiable-link" href="#index-scm_005fmacro_005fname"> ¶</a></span></dt>
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<dd><p>Return the name of the macro <var class="var">m</var>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-macro_002dbinding"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">macro-binding</strong> <var class="def-var-arguments">m</var><a class="copiable-link" href="#index-macro_002dbinding"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fmacro_005fbinding"><span class="category-def">C Function: </span><span><strong class="def-name">scm_macro_binding</strong> <var class="def-var-arguments">(m)</var><a class="copiable-link" href="#index-scm_005fmacro_005fbinding"> ¶</a></span></dt>
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<dd><p>Return the binding of the macro <var class="var">m</var>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-macro_002dtransformer"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">macro-transformer</strong> <var class="def-var-arguments">m</var><a class="copiable-link" href="#index-macro_002dtransformer"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fmacro_005ftransformer"><span class="category-def">C Function: </span><span><strong class="def-name">scm_macro_transformer</strong> <var class="def-var-arguments">(m)</var><a class="copiable-link" href="#index-scm_005fmacro_005ftransformer"> ¶</a></span></dt>
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<dd><p>Return the transformer of the macro <var class="var">m</var>. This will return a procedure, for
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which one may ask the docstring. That’s the whole reason this section is
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documented. Actually a part of the result of <code class="code">macro-binding</code>.
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</p></dd></dl>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Previous: <a href="Hygiene-and-the-Top_002dLevel.html">Hygiene and the Top-Level</a>, Up: <a href="Macros.html">Macros</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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</div>
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</body>
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</html>
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