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144 lines
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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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<title>rnrs unicode (Guile Reference Manual)</title>
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<div class="subsubsection-level-extent" id="rnrs-unicode">
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<p>
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Next: <a href="rnrs-bytevectors.html" accesskey="n" rel="next">rnrs bytevectors</a>, Previous: <a href="rnrs-base.html" accesskey="p" rel="prev">rnrs base</a>, Up: <a href="R6RS-Standard-Libraries.html" accesskey="u" rel="up">R6RS Standard Libraries</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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<hr>
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<h4 class="subsubsection" id="rnrs-unicode-1"><span>7.6.2.3 rnrs unicode<a class="copiable-link" href="#rnrs-unicode-1"> ¶</a></span></h4>
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<p>The <code class="code">(rnrs unicode (6))</code> library provides procedures for
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manipulating Unicode characters and strings.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-char_002dupcase-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-upcase</strong> <var class="def-var-arguments">char</var><a class="copiable-link" href="#index-char_002dupcase-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002ddowncase-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-downcase</strong> <var class="def-var-arguments">char</var><a class="copiable-link" href="#index-char_002ddowncase-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002dtitlecase-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-titlecase</strong> <var class="def-var-arguments">char</var><a class="copiable-link" href="#index-char_002dtitlecase-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002dfoldcase"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-foldcase</strong> <var class="def-var-arguments">char</var><a class="copiable-link" href="#index-char_002dfoldcase"> ¶</a></span></dt>
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<dd><p>These procedures translate their arguments from one Unicode character
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set to another. <code class="code">char-upcase</code>, <code class="code">char-downcase</code>, and
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<code class="code">char-titlecase</code> are identical to their counterparts in the
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Guile core library; See <a class="xref" href="Characters.html">Characters</a>, for documentation.
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</p>
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<p><code class="code">char-foldcase</code> returns the result of applying <code class="code">char-upcase</code>
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to its argument, followed by <code class="code">char-downcase</code>—except in the case
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of the Turkic characters <code class="code">U+0130</code> and <code class="code">U+0131</code>, for which the
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procedure acts as the identity function.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-char_002dci_003d_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-ci=?</strong> <var class="def-var-arguments">char1 char2 char3 ...</var><a class="copiable-link" href="#index-char_002dci_003d_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002dci_003c_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-ci<?</strong> <var class="def-var-arguments">char1 char2 char3 ...</var><a class="copiable-link" href="#index-char_002dci_003c_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002dci_003e_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-ci>?</strong> <var class="def-var-arguments">char1 char2 char3 ...</var><a class="copiable-link" href="#index-char_002dci_003e_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002dci_003c_003d_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-ci<=?</strong> <var class="def-var-arguments">char1 char2 char3 ...</var><a class="copiable-link" href="#index-char_002dci_003c_003d_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002dci_003e_003d_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-ci>=?</strong> <var class="def-var-arguments">char1 char2 char3 ...</var><a class="copiable-link" href="#index-char_002dci_003e_003d_003f-1"> ¶</a></span></dt>
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<dd><p>These procedures facilitate case-insensitive comparison of Unicode
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characters. They are identical to the procedures provided by Guile’s
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core library. See <a class="xref" href="Characters.html">Characters</a>, for documentation.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-char_002dalphabetic_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-alphabetic?</strong> <var class="def-var-arguments">char</var><a class="copiable-link" href="#index-char_002dalphabetic_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002dnumeric_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-numeric?</strong> <var class="def-var-arguments">char</var><a class="copiable-link" href="#index-char_002dnumeric_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002dwhitespace_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-whitespace?</strong> <var class="def-var-arguments">char</var><a class="copiable-link" href="#index-char_002dwhitespace_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002dupper_002dcase_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-upper-case?</strong> <var class="def-var-arguments">char</var><a class="copiable-link" href="#index-char_002dupper_002dcase_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002dlower_002dcase_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-lower-case?</strong> <var class="def-var-arguments">char</var><a class="copiable-link" href="#index-char_002dlower_002dcase_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-char_002dtitle_002dcase_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-title-case?</strong> <var class="def-var-arguments">char</var><a class="copiable-link" href="#index-char_002dtitle_002dcase_003f"> ¶</a></span></dt>
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<dd><p>These procedures implement various Unicode character set predicates.
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They are identical to the procedures provided by Guile’s core library.
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See <a class="xref" href="Characters.html">Characters</a>, for documentation.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-char_002dgeneral_002dcategory-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">char-general-category</strong> <var class="def-var-arguments">char</var><a class="copiable-link" href="#index-char_002dgeneral_002dcategory-1"> ¶</a></span></dt>
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<dd><p>See <a class="xref" href="Characters.html">Characters</a>, for documentation.
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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_002dupcase-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-upcase</strong> <var class="def-var-arguments">string</var><a class="copiable-link" href="#index-string_002dupcase-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-string_002ddowncase-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-downcase</strong> <var class="def-var-arguments">string</var><a class="copiable-link" href="#index-string_002ddowncase-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-string_002dtitlecase-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-titlecase</strong> <var class="def-var-arguments">string</var><a class="copiable-link" href="#index-string_002dtitlecase-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-string_002dfoldcase"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-foldcase</strong> <var class="def-var-arguments">string</var><a class="copiable-link" href="#index-string_002dfoldcase"> ¶</a></span></dt>
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<dd><p>These procedures perform Unicode case folding operations on their input.
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See <a class="xref" href="Alphabetic-Case-Mapping.html">Alphabetic Case Mapping</a>, for documentation.
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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_002dci_003d_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-ci=?</strong> <var class="def-var-arguments">string1 string2 string3 ...</var><a class="copiable-link" href="#index-string_002dci_003d_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-string_002dci_003c_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-ci<?</strong> <var class="def-var-arguments">string1 string2 string3 ...</var><a class="copiable-link" href="#index-string_002dci_003c_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-string_002dci_003e_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-ci>?</strong> <var class="def-var-arguments">string1 string2 string3 ...</var><a class="copiable-link" href="#index-string_002dci_003e_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-string_002dci_003c_003d_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-ci<=?</strong> <var class="def-var-arguments">string1 string2 string3 ...</var><a class="copiable-link" href="#index-string_002dci_003c_003d_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-string_002dci_003e_003d_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-ci>=?</strong> <var class="def-var-arguments">string1 string2 string3 ...</var><a class="copiable-link" href="#index-string_002dci_003e_003d_003f-1"> ¶</a></span></dt>
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<dd><p>These procedures perform case-insensitive comparison on their input.
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See <a class="xref" href="String-Comparison.html">String Comparison</a>, for documentation.
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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_002dnormalize_002dnfd-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-normalize-nfd</strong> <var class="def-var-arguments">string</var><a class="copiable-link" href="#index-string_002dnormalize_002dnfd-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-string_002dnormalize_002dnfkd-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-normalize-nfkd</strong> <var class="def-var-arguments">string</var><a class="copiable-link" href="#index-string_002dnormalize_002dnfkd-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-string_002dnormalize_002dnfc-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-normalize-nfc</strong> <var class="def-var-arguments">string</var><a class="copiable-link" href="#index-string_002dnormalize_002dnfc-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-string_002dnormalize_002dnfkc-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string-normalize-nfkc</strong> <var class="def-var-arguments">string</var><a class="copiable-link" href="#index-string_002dnormalize_002dnfkc-1"> ¶</a></span></dt>
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<dd><p>These procedures perform Unicode string normalization operations on
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their input. See <a class="xref" href="String-Comparison.html">String Comparison</a>, for documentation.
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</p></dd></dl>
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</div>
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<hr>
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<p>
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Next: <a href="rnrs-bytevectors.html">rnrs bytevectors</a>, Previous: <a href="rnrs-base.html">rnrs base</a>, Up: <a href="R6RS-Standard-Libraries.html">R6RS Standard Libraries</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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