112 lines
5.6 KiB
HTML
112 lines
5.6 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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<head>
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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>List/String Conversion (Guile Reference Manual)</title>
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<meta name="description" content="List/String Conversion (Guile Reference Manual)">
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<meta name="keywords" content="List/String Conversion (Guile Reference Manual)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content=".texi2any-real">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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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="Strings.html" rel="up" title="Strings">
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<link href="String-Selection.html" rel="next" title="String Selection">
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<link href="String-Constructors.html" rel="prev" title="String Constructors">
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<style type="text/css">
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a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
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</style>
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="subsubsection-level-extent" id="List_002fString-Conversion">
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<div class="nav-panel">
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<p>
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Next: <a href="String-Selection.html" accesskey="n" rel="next">String Selection</a>, Previous: <a href="String-Constructors.html" accesskey="p" rel="prev">String Constructors</a>, Up: <a href="Strings.html" accesskey="u" rel="up">Strings</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="subsubsection" id="List_002fString-conversion"><span>6.6.5.4 List/String conversion<a class="copiable-link" href="#List_002fString-conversion"> ¶</a></span></h4>
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<p>When processing strings, it is often convenient to first convert them
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into a list representation by using the procedure <code class="code">string->list</code>,
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work with the resulting list, and then convert it back into a string.
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These procedures are useful for similar tasks.
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</p>
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<a class="index-entry-id" id="index-string_002d_003elist-2"></a>
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<dl class="first-deffn">
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<dt class="deffn" id="index-string_002d_003elist"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string->list</strong> <var class="def-var-arguments">str [start [end]]</var><a class="copiable-link" href="#index-string_002d_003elist"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fsubstring_005fto_005flist"><span class="category-def">C Function: </span><span><strong class="def-name">scm_substring_to_list</strong> <var class="def-var-arguments">(str, start, end)</var><a class="copiable-link" href="#index-scm_005fsubstring_005fto_005flist"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fstring_005fto_005flist"><span class="category-def">C Function: </span><span><strong class="def-name">scm_string_to_list</strong> <var class="def-var-arguments">(str)</var><a class="copiable-link" href="#index-scm_005fstring_005fto_005flist"> ¶</a></span></dt>
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<dd><p>Convert the string <var class="var">str</var> into a list of characters.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-string_002dsplit"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-split</strong> <var class="def-var-arguments">str char_pred</var><a class="copiable-link" href="#index-string_002dsplit"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fstring_005fsplit"><span class="category-def">C Function: </span><span><strong class="def-name">scm_string_split</strong> <var class="def-var-arguments">(str, char_pred)</var><a class="copiable-link" href="#index-scm_005fstring_005fsplit"> ¶</a></span></dt>
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<dd><p>Split the string <var class="var">str</var> into a list of substrings delimited
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by appearances of characters that
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</p>
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<ul class="itemize mark-bullet">
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<li>equal <var class="var">char_pred</var>, if it is a character,
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</li><li>satisfy the predicate <var class="var">char_pred</var>, if it is a procedure,
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</li><li>are in the set <var class="var">char_pred</var>, if it is a character set.
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</li></ul>
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<p>Note that an empty substring between separator characters will result in
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an empty string in the result list.
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted">(string-split "root:x:0:0:root:/root:/bin/bash" #\:)
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⇒
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("root" "x" "0" "0" "root" "/root" "/bin/bash")
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(string-split "::" #\:)
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⇒
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("" "" "")
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(string-split "" #\:)
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⇒
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("")
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</pre></div>
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</dd></dl>
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</div>
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</body>
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</html>
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