145 lines
6.4 KiB
HTML
145 lines
6.4 KiB
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<!DOCTYPE html>
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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>R6RS Version References (Guile Reference Manual)</title>
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<meta name="description" content="R6RS Version References (Guile Reference Manual)">
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<link href="index.html" rel="start" title="Top">
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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="Modules.html" rel="up" title="Modules">
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<link href="R6RS-Libraries.html" rel="next" title="R6RS Libraries">
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<link href="Modules-and-the-File-System.html" rel="prev" title="Modules and the File System">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="R6RS-Version-References">
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<div class="nav-panel">
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<p>
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Next: <a href="R6RS-Libraries.html" accesskey="n" rel="next">R6RS Libraries</a>, Previous: <a href="Modules-and-the-File-System.html" accesskey="p" rel="prev">Modules and the File System</a>, Up: <a href="Modules.html" accesskey="u" rel="up">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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</div>
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<hr>
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<h4 class="subsection" id="R6RS-Version-References-1"><span>6.18.5 R6RS Version References<a class="copiable-link" href="#R6RS-Version-References-1"> ¶</a></span></h4>
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<p>Guile’s module system includes support for locating modules based on
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a declared version specifier of the same form as the one described in
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R6RS (see <a data-manual="r6rs" href="../r6rs_html/Library-form.html#Library-form">R6RS Library Form</a> in <cite class="cite">The Revised^6
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Report on the Algorithmic Language Scheme</cite>). By using the
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<code class="code">#:version</code> keyword in a <code class="code">define-module</code> form, a module may
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specify a version as a list of zero or more exact, non-negative integers.
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</p>
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<p>This version can then be used to locate the module during the module
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search process. Client modules and callers of the <code class="code">use-modules</code>
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function may specify constraints on the versions of target modules by
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providing a <em class="dfn">version reference</em>, which has one of the following
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forms:
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted"> (<var class="var">sub-version-reference</var> ...)
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(and <var class="var">version-reference</var> ...)
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(or <var class="var">version-reference</var> ...)
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(not <var class="var">version-reference</var>)
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</pre></div>
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<p>in which <var class="var">sub-version-reference</var> is in turn one of:
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted"> (<var class="var">sub-version</var>)
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(>= <var class="var">sub-version</var>)
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(<= <var class="var">sub-version</var>)
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(and <var class="var">sub-version-reference</var> ...)
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(or <var class="var">sub-version-reference</var> ...)
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(not <var class="var">sub-version-reference</var>)
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</pre></div>
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<p>in which <var class="var">sub-version</var> is an exact, non-negative integer as above. A
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version reference matches a declared module version if each element of
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the version reference matches a corresponding element of the module
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version, according to the following rules:
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</p>
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<ul class="itemize mark-bullet">
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<li>The <code class="code">and</code> sub-form matches a version or version element if every
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element in the tail of the sub-form matches the specified version or
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version element.
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</li><li>The <code class="code">or</code> sub-form matches a version or version element if any
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element in the tail of the sub-form matches the specified version or
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version element.
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</li><li>The <code class="code">not</code> sub-form matches a version or version element if the tail
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of the sub-form does not match the version or version element.
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</li><li>The <code class="code">>=</code> sub-form matches a version element if the element is
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greater than or equal to the <var class="var">sub-version</var> in the tail of the
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sub-form.
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</li><li>The <code class="code"><=</code> sub-form matches a version element if the version is less
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than or equal to the <var class="var">sub-version</var> in the tail of the sub-form.
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</li><li>A <var class="var">sub-version</var> matches a version element if one is <var class="var">eqv?</var> to
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the other.
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</li></ul>
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<p>For example, a module declared as:
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted"> (define-module (mylib mymodule) #:version (1 2 0))
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</pre></div>
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<p>would be successfully loaded by any of the following <code class="code">use-modules</code>
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expressions:
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted"> (use-modules ((mylib mymodule) #:version (1 2 (>= 0))))
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(use-modules ((mylib mymodule) #:version (or (1 2 0) (1 2 1))))
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(use-modules ((mylib mymodule) #:version ((and (>= 1) (not 2)) 2 0)))
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</pre></div>
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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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Next: <a href="R6RS-Libraries.html">R6RS Libraries</a>, Previous: <a href="Modules-and-the-File-System.html">Modules and the File System</a>, Up: <a href="Modules.html">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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</div>
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</body>
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</html>
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