<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Char Classification (alnum, digit, etc.)</title> <link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.0"> <link rel="home" href="../../../../index.html" title="Spirit 2.4"> <link rel="up" href="../char.html" title="Char"> <link rel="prev" href="char.html" title="Char (char_, lit)"> <link rel="next" href="../directive.html" title="Directive"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td> <td align="center"><a href="../../../../../../../../index.html">Home</a></td> <td align="center"><a href="../../../../../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="char.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../char.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../directive.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h5 class="title"> <a name="spirit.qi.reference.char.char_class"></a><a class="link" href="char_class.html" title="Char Classification (alnum, digit, etc.)"> Char Classification (<code class="computeroutput"><span class="identifier">alnum</span></code>, <code class="computeroutput"><span class="identifier">digit</span></code>, etc.)</a> </h5></div></div></div> <a name="spirit.qi.reference.char.char_class.description"></a><h6> <a name="id925003"></a> <a class="link" href="char_class.html#spirit.qi.reference.char.char_class.description">Description</a> </h6> <p> The library has the full repertoire of single character parsers for character classification. This includes the usual <code class="computeroutput"><span class="identifier">alnum</span></code>, <code class="computeroutput"><span class="identifier">alpha</span></code>, <code class="computeroutput"><span class="identifier">digit</span></code>, <code class="computeroutput"><span class="identifier">xdigit</span></code>, etc. parsers. These parsers have an associated <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character Encoding Namespace</a>. This is needed when doing basic operations such as inhibiting case sensitivity. </p> <a name="spirit.qi.reference.char.char_class.header"></a><h6> <a name="id925055"></a> <a class="link" href="char_class.html#spirit.qi.reference.char.char_class.header">Header</a> </h6> <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/qi/char/char_class.hpp> </span><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">spirit</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">qi_char_class</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> </pre> <p> Also, see <a class="link" href="../../../structure/include.html" title="Include">Include Structure</a>. </p> <a name="spirit.qi.reference.char.char_class.namespace"></a><h6> <a name="id925129"></a> <a class="link" href="char_class.html#spirit.qi.reference.char.char_class.namespace">Namespace</a> </h6> <div class="informaltable"><table class="table"> <colgroup><col></colgroup> <thead><tr><th> <p> Name </p> </th></tr></thead> <tbody> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">alnum</span></code> </p> </td></tr> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">alpha</span></code> </p> </td></tr> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">blank</span></code> </p> </td></tr> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">cntrl</span></code> </p> </td></tr> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">digit</span></code> </p> </td></tr> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">graph</span></code> </p> </td></tr> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">lower</span></code> </p> </td></tr> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">print</span></code> </p> </td></tr> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">punct</span></code> </p> </td></tr> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">space</span></code> </p> </td></tr> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">upper</span></code> </p> </td></tr> <tr><td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">xdigit</span></code> </p> </td></tr> </tbody> </table></div> <p> In the table above, <code class="computeroutput"><span class="identifier">ns</span></code> represents a <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character Encoding Namespace</a>. </p> <a name="spirit.qi.reference.char.char_class.model_of"></a><h6> <a name="id925488"></a> <a class="link" href="char_class.html#spirit.qi.reference.char.char_class.model_of">Model of</a> </h6> <div class="blockquote"><blockquote class="blockquote"><p> <a class="link" href="../parser_concepts/primitiveparser.html" title="PrimitiveParser"><code class="computeroutput"><span class="identifier">PrimitiveParser</span></code></a> </p></blockquote></div> <div class="variablelist"> <p class="title"><b>Notation</b></p> <dl> <dt><span class="term"><code class="computeroutput"><span class="identifier">ns</span></code></span></dt> <dd><p> A <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character Encoding Namespace</a>. </p></dd> </dl> </div> <a name="spirit.qi.reference.char.char_class.expression_semantics"></a><h6> <a name="id925552"></a> <a class="link" href="char_class.html#spirit.qi.reference.char.char_class.expression_semantics">Expression Semantics</a> </h6> <p> Semantics of an expression is defined only where it differs from, or is not defined in <a class="link" href="../parser_concepts/primitiveparser.html" title="PrimitiveParser"><code class="computeroutput"><span class="identifier">PrimitiveParser</span></code></a>. </p> <div class="informaltable"><table class="table"> <colgroup> <col> <col> </colgroup> <thead><tr> <th> <p> Expression </p> </th> <th> <p> Semantics </p> </th> </tr></thead> <tbody> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">alnum</span></code> </p> </td> <td> <p> Matches alpha-numeric characters </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">alpha</span></code> </p> </td> <td> <p> Matches alphabetic characters </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">blank</span></code> </p> </td> <td> <p> Matches spaces or tabs </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">cntrl</span></code> </p> </td> <td> <p> Matches control characters </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">digit</span></code> </p> </td> <td> <p> Matches numeric digits </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">graph</span></code> </p> </td> <td> <p> Matches non-space printing characters </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">lower</span></code> </p> </td> <td> <p> Matches lower case letters </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">print</span></code> </p> </td> <td> <p> Matches printable characters </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">punct</span></code> </p> </td> <td> <p> Matches punctuation symbols </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">space</span></code> </p> </td> <td> <p> Matches spaces, tabs, returns, and newlines </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">upper</span></code> </p> </td> <td> <p> Matches upper case letters </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">xdigit</span></code> </p> </td> <td> <p> Matches hexadecimal digits </p> </td> </tr> </tbody> </table></div> <a name="spirit.qi.reference.char.char_class.attributes"></a><h6> <a name="id926004"></a> <a class="link" href="char_class.html#spirit.qi.reference.char.char_class.attributes">Attributes</a> </h6> <div class="blockquote"><blockquote class="blockquote"><p> The character type of the <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character Encoding Namespace</a>, <code class="computeroutput"><span class="identifier">ns</span></code>. </p></blockquote></div> <a name="spirit.qi.reference.char.char_class.complexity"></a><h6> <a name="id926036"></a> <a class="link" href="char_class.html#spirit.qi.reference.char.char_class.complexity">Complexity</a> </h6> <div class="blockquote"><blockquote class="blockquote"><p> O(N) </p></blockquote></div> <a name="spirit.qi.reference.char.char_class.example"></a><h6> <a name="id926057"></a> <a class="link" href="char_class.html#spirit.qi.reference.char.char_class.example">Example</a> </h6> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p> The test harness for the example(s) below is presented in the <a class="link" href="../basics.html#spirit.qi.reference.basics.examples">Basics Examples</a> section. </p></td></tr> </table></div> <p> Some using declarations: </p> <p> </p> <pre class="programlisting"><span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">ascii</span><span class="special">::</span><span class="identifier">alnum</span><span class="special">;</span> <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">ascii</span><span class="special">::</span><span class="identifier">blank</span><span class="special">;</span> <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">ascii</span><span class="special">::</span><span class="identifier">digit</span><span class="special">;</span> <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">ascii</span><span class="special">::</span><span class="identifier">lower</span><span class="special">;</span> </pre> <p> </p> <p> Basic usage: </p> <p> </p> <pre class="programlisting"><span class="identifier">test_parser</span><span class="special">(</span><span class="string">"1"</span><span class="special">,</span> <span class="identifier">alnum</span><span class="special">);</span> <span class="identifier">test_parser</span><span class="special">(</span><span class="string">" "</span><span class="special">,</span> <span class="identifier">blank</span><span class="special">);</span> <span class="identifier">test_parser</span><span class="special">(</span><span class="string">"1"</span><span class="special">,</span> <span class="identifier">digit</span><span class="special">);</span> <span class="identifier">test_parser</span><span class="special">(</span><span class="string">"a"</span><span class="special">,</span> <span class="identifier">lower</span><span class="special">);</span> </pre> <p> </p> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2001-2010 Joel de Guzman, Hartmut Kaiser<p> Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="char.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../char.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../directive.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>