1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Parser Directive Inhibiting Case Sensitivity (no_case[])</title> 5<link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../../index.html" title="Spirit 2.5.8"> 8<link rel="up" href="../directive.html" title="Parser Directives"> 9<link rel="prev" href="no_skip.html" title="Parser Directive Inhibiting Skipping Without Pre-skip (no_skip[])"> 10<link rel="next" href="omit.html" title="Parser Directive Ignoring Attribute (omit[])"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="no_skip.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../directive.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="omit.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h5 class="title"> 27<a name="spirit.qi.reference.directive.no_case"></a><a class="link" href="no_case.html" title="Parser Directive Inhibiting Case Sensitivity (no_case[])">Parser Directive 28 Inhibiting Case Sensitivity (<code class="computeroutput"><span class="identifier">no_case</span><span class="special">[]</span></code>)</a> 29</h5></div></div></div> 30<h6> 31<a name="spirit.qi.reference.directive.no_case.h0"></a> 32 <span class="phrase"><a name="spirit.qi.reference.directive.no_case.description"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.description">Description</a> 33 </h6> 34<p> 35 The <code class="computeroutput"><span class="identifier">no_case</span><span class="special">[]</span></code> 36 directive does not consume any input. The actual matching is done by 37 its subject parser. It's purpose is to force matching of the subject 38 parser (and all its children) to be case insensitive. 39 </p> 40<h6> 41<a name="spirit.qi.reference.directive.no_case.h1"></a> 42 <span class="phrase"><a name="spirit.qi.reference.directive.no_case.header"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.header">Header</a> 43 </h6> 44<pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/qi/directive/no_case.hpp></span> 45<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_no_case</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 46</pre> 47<p> 48 Also, see <a class="link" href="../../../structure/include.html" title="Include">Include Structure</a>. 49 </p> 50<h6> 51<a name="spirit.qi.reference.directive.no_case.h2"></a> 52 <span class="phrase"><a name="spirit.qi.reference.directive.no_case.namespace"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.namespace">Namespace</a> 53 </h6> 54<div class="informaltable"><table class="table"> 55<colgroup><col></colgroup> 56<thead><tr><th> 57 <p> 58 Name 59 </p> 60 </th></tr></thead> 61<tbody><tr><td> 62 <p> 63 <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">no_case</span></code> 64 </p> 65 </td></tr></tbody> 66</table></div> 67<p> 68 In the table above, <code class="computeroutput"><span class="identifier">ns</span></code> 69 represents a <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character 70 Encoding Namespace</a>. 71 </p> 72<h6> 73<a name="spirit.qi.reference.directive.no_case.h3"></a> 74 <span class="phrase"><a name="spirit.qi.reference.directive.no_case.model_of"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.model_of">Model 75 of</a> 76 </h6> 77<p> 78 The model of <code class="computeroutput"><span class="identifier">no_case</span></code> 79 is the model of its subject parser. 80 </p> 81<div class="variablelist"> 82<p class="title"><b>Notation</b></p> 83<dl class="variablelist"> 84<dt><span class="term"><code class="computeroutput"><span class="identifier">a</span></code></span></dt> 85<dd><p> 86 A <a class="link" href="../parser_concepts/parser.html" title="Parser"><code class="computeroutput"><span class="identifier">Parser</span></code></a>. 87 </p></dd> 88<dt><span class="term"><code class="computeroutput"><span class="identifier">ns</span></code></span></dt> 89<dd><p> 90 A <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character 91 Encoding Namespace</a>. 92 </p></dd> 93</dl> 94</div> 95<h6> 96<a name="spirit.qi.reference.directive.no_case.h4"></a> 97 <span class="phrase"><a name="spirit.qi.reference.directive.no_case.expression_semantics"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.expression_semantics">Expression 98 Semantics</a> 99 </h6> 100<p> 101 Semantics of an expression is defined only where it differs from, or 102 is not defined in the subject's concept. 103 </p> 104<div class="informaltable"><table class="table"> 105<colgroup> 106<col> 107<col> 108</colgroup> 109<thead><tr> 110<th> 111 <p> 112 Expression 113 </p> 114 </th> 115<th> 116 <p> 117 Semantics 118 </p> 119 </th> 120</tr></thead> 121<tbody><tr> 122<td> 123 <p> 124 <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">no_case</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span></code> 125 </p> 126 </td> 127<td> 128 <p> 129 Force matching of the subject parser, <code class="computeroutput"><span class="identifier">a</span></code> 130 (and all its children) to be case insensitive 131 </p> 132 </td> 133</tr></tbody> 134</table></div> 135<h6> 136<a name="spirit.qi.reference.directive.no_case.h5"></a> 137 <span class="phrase"><a name="spirit.qi.reference.directive.no_case.attributes"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.attributes">Attributes</a> 138 </h6> 139<p> 140 See <a class="link" href="../../quick_reference/compound_attribute_rules.html#spirit.qi.quick_reference.compound_attribute_rules.notation">Compound 141 Attribute Notation</a>. 142 </p> 143<div class="informaltable"><table class="table"> 144<colgroup> 145<col> 146<col> 147</colgroup> 148<thead><tr> 149<th> 150 <p> 151 Expression 152 </p> 153 </th> 154<th> 155 <p> 156 Attribute 157 </p> 158 </th> 159</tr></thead> 160<tbody><tr> 161<td> 162 <p> 163 <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">no_case</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span></code> 164 </p> 165 </td> 166<td> 167 <p> 168</p> 169<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">a</span><span class="special">:</span> <span class="identifier">A</span> <span class="special">--></span> <span class="identifier">ns</span><span class="special">::</span><span class="identifier">no_case</span><span class="special">[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">A</span> 170<span class="identifier">a</span><span class="special">:</span> <span class="identifier">Unused</span> <span class="special">--></span> <span class="identifier">ns</span><span class="special">::</span><span class="identifier">no_case</span><span class="special">[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">Unused</span></pre> 171<p> 172 </p> 173 </td> 174</tr></tbody> 175</table></div> 176<h6> 177<a name="spirit.qi.reference.directive.no_case.h6"></a> 178 <span class="phrase"><a name="spirit.qi.reference.directive.no_case.complexity"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.complexity">Complexity</a> 179 </h6> 180<div class="blockquote"><blockquote class="blockquote"><p> 181 The complexity is defined by the complexity of the subject parser, 182 <code class="computeroutput"><span class="identifier">a</span></code> 183 </p></blockquote></div> 184<h6> 185<a name="spirit.qi.reference.directive.no_case.h7"></a> 186 <span class="phrase"><a name="spirit.qi.reference.directive.no_case.example"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.example">Example</a> 187 </h6> 188<div class="note"><table border="0" summary="Note"> 189<tr> 190<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td> 191<th align="left">Note</th> 192</tr> 193<tr><td align="left" valign="top"><p> 194 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> 195 section. 196 </p></td></tr> 197</table></div> 198<p> 199 Some using declarations: 200 </p> 201<p> 202</p> 203<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">no_case</span><span class="special">;</span> 204<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">char_</span><span class="special">;</span> 205<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> 206<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">qi</span><span class="special">::</span><span class="identifier">symbols</span><span class="special">;</span> 207</pre> 208<p> 209 </p> 210<p> 211 Simple usage of <code class="computeroutput"><span class="identifier">no_case</span><span class="special">[]</span></code>: 212 </p> 213<p> 214</p> 215<pre class="programlisting"><span class="identifier">test_parser</span><span class="special">(</span><span class="string">"X"</span><span class="special">,</span> <span class="identifier">no_case</span><span class="special">[</span><span class="identifier">char_</span><span class="special">(</span><span class="char">'x'</span><span class="special">)]);</span> 216<span class="identifier">test_parser</span><span class="special">(</span><span class="string">"6"</span><span class="special">,</span> <span class="identifier">no_case</span><span class="special">[</span><span class="identifier">alnum</span><span class="special">]);</span> 217</pre> 218<p> 219 </p> 220<p> 221 A more sophisticated use case of <code class="computeroutput"><span class="identifier">no_case</span><span class="special">[]</span></code> in conjunction with a symbol table 222 (see <a class="link" href="../string/symbols.html" title="Symbols Parser (symbols)"><code class="computeroutput"><span class="identifier">symbols</span><span class="special"><></span></code></a> 223 for more details): 224 </p> 225<p> 226</p> 227<pre class="programlisting"><span class="identifier">symbols</span><span class="special"><</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">int</span><span class="special">></span> <span class="identifier">sym</span><span class="special">;</span> 228 229<span class="identifier">sym</span><span class="special">.</span><span class="identifier">add</span> 230 <span class="special">(</span><span class="string">"apple"</span><span class="special">,</span> <span class="number">1</span><span class="special">)</span> <span class="comment">// symbol strings are added in lowercase...</span> 231 <span class="special">(</span><span class="string">"banana"</span><span class="special">,</span> <span class="number">2</span><span class="special">)</span> 232 <span class="special">(</span><span class="string">"orange"</span><span class="special">,</span> <span class="number">3</span><span class="special">)</span> 233<span class="special">;</span> 234 235<span class="keyword">int</span> <span class="identifier">i</span><span class="special">;</span> 236<span class="comment">// ...because sym is used for case-insensitive parsing</span> 237<span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"Apple"</span><span class="special">,</span> <span class="identifier">no_case</span><span class="special">[</span> <span class="identifier">sym</span> <span class="special">],</span> <span class="identifier">i</span><span class="special">);</span> 238<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">i</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> 239<span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"ORANGE"</span><span class="special">,</span> <span class="identifier">no_case</span><span class="special">[</span> <span class="identifier">sym</span> <span class="special">],</span> <span class="identifier">i</span><span class="special">);</span> 240<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">i</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> 241</pre> 242<p> 243 </p> 244</div> 245<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 246<td align="left"></td> 247<td align="right"><div class="copyright-footer">Copyright © 2001-2011 Joel de Guzman, Hartmut Kaiser<p> 248 Distributed under the Boost Software License, Version 1.0. (See accompanying 249 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>) 250 </p> 251</div></td> 252</tr></table> 253<hr> 254<div class="spirit-nav"> 255<a accesskey="p" href="no_skip.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../directive.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="omit.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 256</div> 257</body> 258</html> 259
