1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Parser Directive Inhibiting Skipping Without Pre-skip (no_skip[])</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="lexeme.html" title="Parser Directive Inhibiting Skipping (lexeme[])"> 10<link rel="next" href="no_case.html" title="Parser Directive Inhibiting Case Sensitivity (no_case[])"> 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="lexeme.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="no_case.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_skip"></a><a class="link" href="no_skip.html" title="Parser Directive Inhibiting Skipping Without Pre-skip (no_skip[])">Parser Directive 28 Inhibiting Skipping Without Pre-skip (<code class="computeroutput"><span class="identifier">no_skip</span><span class="special">[]</span></code>)</a> 29</h5></div></div></div> 30<h6> 31<a name="spirit.qi.reference.directive.no_skip.h0"></a> 32 <span class="phrase"><a name="spirit.qi.reference.directive.no_skip.description"></a></span><a class="link" href="no_skip.html#spirit.qi.reference.directive.no_skip.description">Description</a> 33 </h6> 34<p> 35 The <code class="computeroutput"><span class="identifier">no_skip</span><span class="special">[]</span></code> 36 directive turns off white space skipping. The difference to <a class="link" href="lexeme.html" title="Parser Directive Inhibiting Skipping (lexeme[])"><code class="computeroutput"><span class="identifier">lexeme</span></code></a> is that it does not do 37 pre-skipping in any case. Otherwise it is completely equivalent to the 38 <a class="link" href="lexeme.html" title="Parser Directive Inhibiting Skipping (lexeme[])"><code class="computeroutput"><span class="identifier">lexeme</span></code></a> 39 directive. 40 </p> 41<h6> 42<a name="spirit.qi.reference.directive.no_skip.h1"></a> 43 <span class="phrase"><a name="spirit.qi.reference.directive.no_skip.header"></a></span><a class="link" href="no_skip.html#spirit.qi.reference.directive.no_skip.header">Header</a> 44 </h6> 45<pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/qi/directive/no_skip.hpp></span> 46<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_skip</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 47</pre> 48<p> 49 Also, see <a class="link" href="../../../structure/include.html" title="Include">Include Structure</a>. 50 </p> 51<h6> 52<a name="spirit.qi.reference.directive.no_skip.h2"></a> 53 <span class="phrase"><a name="spirit.qi.reference.directive.no_skip.namespace"></a></span><a class="link" href="no_skip.html#spirit.qi.reference.directive.no_skip.namespace">Namespace</a> 54 </h6> 55<div class="informaltable"><table class="table"> 56<colgroup><col></colgroup> 57<thead><tr><th> 58 <p> 59 Name 60 </p> 61 </th></tr></thead> 62<tbody><tr><td> 63 <p> 64 <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">no_skip</span> <span class="comment">// 65 alias: boost::spirit::qi::no_skip</span></code> 66 </p> 67 </td></tr></tbody> 68</table></div> 69<h6> 70<a name="spirit.qi.reference.directive.no_skip.h3"></a> 71 <span class="phrase"><a name="spirit.qi.reference.directive.no_skip.model_of"></a></span><a class="link" href="no_skip.html#spirit.qi.reference.directive.no_skip.model_of">Model 72 of</a> 73 </h6> 74<div class="blockquote"><blockquote class="blockquote"><p> 75 <a class="link" href="../parser_concepts/unaryparser.html" title="UnaryParser"><code class="computeroutput"><span class="identifier">UnaryParser</span></code></a> 76 </p></blockquote></div> 77<div class="variablelist"> 78<p class="title"><b>Notation</b></p> 79<dl class="variablelist"> 80<dt><span class="term"><code class="computeroutput"><span class="identifier">a</span></code></span></dt> 81<dd><p> 82 A <a class="link" href="../parser_concepts/parser.html" title="Parser"><code class="computeroutput"><span class="identifier">Parser</span></code></a>. 83 </p></dd> 84</dl> 85</div> 86<h6> 87<a name="spirit.qi.reference.directive.no_skip.h4"></a> 88 <span class="phrase"><a name="spirit.qi.reference.directive.no_skip.expression_semantics"></a></span><a class="link" href="no_skip.html#spirit.qi.reference.directive.no_skip.expression_semantics">Expression 89 Semantics</a> 90 </h6> 91<p> 92 Semantics of an expression is defined only where it differs from, or 93 is not defined in <a class="link" href="../parser_concepts/unaryparser.html" title="UnaryParser"><code class="computeroutput"><span class="identifier">UnaryParser</span></code></a>. 94 </p> 95<div class="informaltable"><table class="table"> 96<colgroup> 97<col> 98<col> 99</colgroup> 100<thead><tr> 101<th> 102 <p> 103 Expression 104 </p> 105 </th> 106<th> 107 <p> 108 Semantics 109 </p> 110 </th> 111</tr></thead> 112<tbody><tr> 113<td> 114 <p> 115 <code class="computeroutput"><span class="identifier">no_skip</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span></code> 116 </p> 117 </td> 118<td> 119 <p> 120 Turns off white space skipping for the subject parser, <code class="computeroutput"><span class="identifier">a</span></code> (and all its children). 121 This directive does not pre-skips. 122 </p> 123 </td> 124</tr></tbody> 125</table></div> 126<h6> 127<a name="spirit.qi.reference.directive.no_skip.h5"></a> 128 <span class="phrase"><a name="spirit.qi.reference.directive.no_skip.attributes"></a></span><a class="link" href="no_skip.html#spirit.qi.reference.directive.no_skip.attributes">Attributes</a> 129 </h6> 130<p> 131 See <a class="link" href="../../quick_reference/compound_attribute_rules.html#spirit.qi.quick_reference.compound_attribute_rules.notation">Compound 132 Attribute Notation</a>. 133 </p> 134<div class="informaltable"><table class="table"> 135<colgroup> 136<col> 137<col> 138</colgroup> 139<thead><tr> 140<th> 141 <p> 142 Expression 143 </p> 144 </th> 145<th> 146 <p> 147 Attribute 148 </p> 149 </th> 150</tr></thead> 151<tbody><tr> 152<td> 153 <p> 154 <code class="computeroutput"><span class="identifier">no_skip</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span></code> 155 </p> 156 </td> 157<td> 158 <p> 159</p> 160<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">no_skip</span><span class="special">[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">A</span> 161<span class="identifier">a</span><span class="special">:</span> <span class="identifier">Unused</span> <span class="special">--></span> <span class="identifier">no_skip</span><span class="special">[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">Unused</span></pre> 162<p> 163 </p> 164 </td> 165</tr></tbody> 166</table></div> 167<h6> 168<a name="spirit.qi.reference.directive.no_skip.h6"></a> 169 <span class="phrase"><a name="spirit.qi.reference.directive.no_skip.complexity"></a></span><a class="link" href="no_skip.html#spirit.qi.reference.directive.no_skip.complexity">Complexity</a> 170 </h6> 171<div class="blockquote"><blockquote class="blockquote"><p> 172 The complexity is defined by the complexity of the subject parser, 173 <code class="computeroutput"><span class="identifier">a</span></code> 174 </p></blockquote></div> 175<h6> 176<a name="spirit.qi.reference.directive.no_skip.h7"></a> 177 <span class="phrase"><a name="spirit.qi.reference.directive.no_skip.example"></a></span><a class="link" href="no_skip.html#spirit.qi.reference.directive.no_skip.example">Example</a> 178 </h6> 179<div class="note"><table border="0" summary="Note"> 180<tr> 181<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td> 182<th align="left">Note</th> 183</tr> 184<tr><td align="left" valign="top"><p> 185 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> 186 section. 187 </p></td></tr> 188</table></div> 189<p> 190 Some using declarations: 191 </p> 192<p> 193</p> 194<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">qi</span><span class="special">::</span><span class="identifier">no_skip</span><span class="special">;</span> 195<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">char_</span><span class="special">;</span> 196</pre> 197<p> 198 </p> 199<p> 200 Simple usage of <code class="computeroutput"><span class="identifier">no_skip</span><span class="special">[]</span></code>: 201 </p> 202<p> 203 The use of no_skip here will prevent skipping of whitespace in front 204 and in between the characters of the string <code class="computeroutput"><span class="char">' 205 abc '</span></code>. 206 </p> 207<p> 208</p> 209<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">str</span><span class="special">;</span> 210<span class="identifier">test_phrase_parser_attr</span><span class="special">(</span><span class="string">"' abc '"</span><span class="special">,</span> 211 <span class="char">'\''</span> <span class="special">>></span> <span class="identifier">no_skip</span><span class="special">[+~</span><span class="identifier">char_</span><span class="special">(</span><span class="char">'\''</span><span class="special">)]</span> <span class="special">>></span> <span class="char">'\''</span><span class="special">,</span> <span class="identifier">str</span><span class="special">);</span> 212<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">str</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> <span class="comment">// will output: > abc <</span> 213</pre> 214<p> 215 </p> 216</div> 217<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 218<td align="left"></td> 219<td align="right"><div class="copyright-footer">Copyright © 2001-2011 Joel de Guzman, Hartmut Kaiser<p> 220 Distributed under the Boost Software License, Version 1.0. (See accompanying 221 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>) 222 </p> 223</div></td> 224</tr></table> 225<hr> 226<div class="spirit-nav"> 227<a accesskey="p" href="lexeme.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="no_case.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 228</div> 229</body> 230</html> 231
