123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333 |
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
- <title>Qi Confix Parser Directive</title>
- <link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css">
- <meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
- <link rel="home" href="../../../index.html" title="Spirit Repository 0.2">
- <link rel="up" href="../directives.html" title="Qi Parser Directives">
- <link rel="prev" href="../directives.html" title="Qi Parser Directives">
- <link rel="next" href="distinct.html" title="Qi Distinct Parser 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="../directives.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../directives.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="distinct.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h4 class="title">
- <a name="spirit_repository.qi_components.directives.confix"></a><a class="link" href="confix.html" title="Qi Confix Parser Directive">Qi
- Confix Parser Directive</a>
- </h4></div></div></div>
- <h6>
- <a name="spirit_repository.qi_components.directives.confix.h0"></a>
- <span class="phrase"><a name="spirit_repository.qi_components.directives.confix.description"></a></span><a class="link" href="confix.html#spirit_repository.qi_components.directives.confix.description">Description</a>
- </h6>
- <p>
- The <span class="emphasis"><em>Spirit.Qi</em></span> <code class="computeroutput"><span class="identifier">confix</span></code>
- directive is a unary parser component allowing to embed a parser (the subject)
- inside an opening (the prefix) and a closing (the suffix):
- </p>
- <pre class="programlisting"><span class="identifier">confix</span><span class="special">(</span><span class="identifier">prefix</span><span class="special">,</span> <span class="identifier">suffix</span><span class="special">)[</span><span class="identifier">subject</span><span class="special">]</span>
- </pre>
- <p>
- This results in a parser that is equivalent to the sequence
- </p>
- <pre class="programlisting"><span class="identifier">omit</span><span class="special">[</span><span class="identifier">prefix</span><span class="special">]</span> <span class="special">>></span> <span class="identifier">subject</span> <span class="special">>></span> <span class="identifier">omit</span><span class="special">[</span><span class="identifier">suffix</span><span class="special">]</span>
- </pre>
- <p>
- A simple example is a parser for non-nested comments which can now be written
- as:
- </p>
- <pre class="programlisting"><span class="identifier">confix</span><span class="special">(</span><span class="string">"/*"</span><span class="special">,</span> <span class="string">"*/"</span><span class="special">)[*(</span><span class="identifier">char_</span> <span class="special">-</span> <span class="string">"*/"</span><span class="special">)]</span> <span class="comment">// C style comment</span>
- <span class="identifier">confix</span><span class="special">(</span><span class="string">"//"</span><span class="special">,</span> <span class="identifier">eol</span><span class="special">)[*(</span><span class="identifier">char_</span> <span class="special">-</span> <span class="identifier">eol</span><span class="special">)]</span> <span class="comment">// C++ style comment</span>
- </pre>
- <p>
- Using the <code class="computeroutput"><span class="identifier">confix</span></code> directive
- instead of the explicit sequence has the advantage of being able to encapsulate
- the prefix and the suffix into a separate construct. The following code
- snippet illustrates the idea:
- </p>
- <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">spirit</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="keyword">namespace</span> <span class="identifier">repo</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">repository</span><span class="special">;</span>
- <span class="comment">// Define a metafunction allowing to compute the type</span>
- <span class="comment">// of the confix() construct</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Prefix</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Suffix</span> <span class="special">=</span> <span class="identifier">Prefix</span><span class="special">></span>
- <span class="keyword">struct</span> <span class="identifier">confix_spec</span>
- <span class="special">{</span>
- <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">spirit</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">terminal</span><span class="special"><</span>
- <span class="identifier">repo</span><span class="special">::</span><span class="identifier">tag</span><span class="special">::</span><span class="identifier">confix</span><span class="special">(</span><span class="identifier">Prefix</span><span class="special">,</span> <span class="identifier">Suffix</span><span class="special">)</span>
- <span class="special">>::</span><span class="identifier">type</span> <span class="identifier">type</span><span class="special">;</span>
- <span class="special">};</span>
- <span class="identifier">confix_spec</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">>::</span><span class="identifier">type</span> <span class="keyword">const</span> <span class="identifier">c_comment</span> <span class="special">=</span> <span class="identifier">repo</span><span class="special">::</span><span class="identifier">confix</span><span class="special">(</span><span class="string">"/*"</span><span class="special">,</span> <span class="string">"*/"</span><span class="special">);</span>
- <span class="identifier">confix_spec</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">>::</span><span class="identifier">type</span> <span class="keyword">const</span> <span class="identifier">cpp_comment</span> <span class="special">=</span> <span class="identifier">repo</span><span class="special">::</span><span class="identifier">confix</span><span class="special">(</span><span class="string">"//"</span><span class="special">,</span> <span class="string">"\n"</span><span class="special">);</span>
- </pre>
- <p>
- Now, the comment parsers can be written as
- </p>
- <pre class="programlisting"><span class="identifier">c_comment</span><span class="special">[*(</span><span class="identifier">char_</span> <span class="special">-</span> <span class="string">"*/"</span><span class="special">)]</span> <span class="comment">// C style comment</span>
- <span class="identifier">cpp_comment</span><span class="special">[*(</span><span class="identifier">char_</span> <span class="special">-</span> <span class="identifier">eol</span><span class="special">)]</span> <span class="comment">// C++ style comment</span>
- </pre>
- <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>
- While the <code class="computeroutput"><span class="identifier">confix_p</span><span class="special">(</span><span class="identifier">prefix</span><span class="special">,</span> <span class="identifier">subject</span><span class="special">,</span>
- <span class="identifier">suffix</span><span class="special">)</span></code>
- parser in <span class="emphasis"><em>Spirit.Classic</em></span> was equivalent to the sequence
- <code class="computeroutput"><span class="identifier">prefix</span> <span class="special">>></span>
- <span class="special">*(</span><span class="identifier">subject</span>
- <span class="special">-</span> <span class="identifier">suffix</span><span class="special">)</span> <span class="special">>></span> <span class="identifier">suffix</span><span class="special">,</span> <span class="identifier">the</span> <span class="emphasis"><em>Spirit.Qi</em></span> </code>confix`
- directive will not perform this refactoring any more. This simplifies
- the code and makes things more explicit.
- </p></td></tr>
- </table></div>
- <h6>
- <a name="spirit_repository.qi_components.directives.confix.h1"></a>
- <span class="phrase"><a name="spirit_repository.qi_components.directives.confix.header"></a></span><a class="link" href="confix.html#spirit_repository.qi_components.directives.confix.header">Header</a>
- </h6>
- <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/repository/home/qi/directive/confix.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">repository</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">qi_confix</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
- </pre>
- <h6>
- <a name="spirit_repository.qi_components.directives.confix.h2"></a>
- <span class="phrase"><a name="spirit_repository.qi_components.directives.confix.synopsis"></a></span><a class="link" href="confix.html#spirit_repository.qi_components.directives.confix.synopsis">Synopsis</a>
- </h6>
- <pre class="programlisting"><span class="identifier">confix</span><span class="special">(</span><span class="identifier">prefix</span><span class="special">,</span> <span class="identifier">suffix</span><span class="special">)[</span><span class="identifier">subject</span><span class="special">]</span>
- </pre>
- <h6>
- <a name="spirit_repository.qi_components.directives.confix.h3"></a>
- <span class="phrase"><a name="spirit_repository.qi_components.directives.confix.parameters"></a></span><a class="link" href="confix.html#spirit_repository.qi_components.directives.confix.parameters">Parameters</a>
- </h6>
- <div class="informaltable"><table class="table">
- <colgroup>
- <col>
- <col>
- </colgroup>
- <thead><tr>
- <th>
- <p>
- Parameter
- </p>
- </th>
- <th>
- <p>
- Description
- </p>
- </th>
- </tr></thead>
- <tbody>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">prefix</span></code>
- </p>
- </td>
- <td>
- <p>
- The parser for the opening (the prefix).
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">suffix</span></code>
- </p>
- </td>
- <td>
- <p>
- The parser for the ending (the suffix).
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">subject</span></code>
- </p>
- </td>
- <td>
- <p>
- The parser for the input sequence between the <code class="computeroutput"><span class="identifier">prefix</span></code>
- and <code class="computeroutput"><span class="identifier">suffix</span></code> parts.
- </p>
- </td>
- </tr>
- </tbody>
- </table></div>
- <p>
- All three parameters can be arbitrarily complex parsers themselves.
- </p>
- <h6>
- <a name="spirit_repository.qi_components.directives.confix.h4"></a>
- <span class="phrase"><a name="spirit_repository.qi_components.directives.confix.attribute"></a></span><a class="link" href="confix.html#spirit_repository.qi_components.directives.confix.attribute">Attribute</a>
- </h6>
- <p>
- The <code class="computeroutput"><span class="identifier">confix</span></code> directive exposes
- the attribute type of its subject as its own attribute type. If the <code class="computeroutput"><span class="identifier">subject</span></code> does not expose any attribute
- (the type is <code class="computeroutput"><span class="identifier">unused_type</span></code>),
- then the <code class="computeroutput"><span class="identifier">confix</span></code> does not
- expose any attribute either.
- </p>
- <pre class="programlisting"><span class="identifier">a</span><span class="special">:</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">p</span><span class="special">:</span> <span class="identifier">P</span><span class="special">,</span> <span class="identifier">s</span><span class="special">:</span> <span class="identifier">S</span><span class="special">:</span> <span class="special">--></span> <span class="identifier">confix</span><span class="special">(</span><span class="identifier">p</span><span class="special">,</span> <span class="identifier">s</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">A</span>
- </pre>
- <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>
- This notation is used all over the Spirit documentation and reads as:
- Given, <code class="computeroutput"><span class="identifier">a</span></code>, <code class="computeroutput"><span class="identifier">p</span></code>, and <code class="computeroutput"><span class="identifier">s</span></code>
- are parsers, and <code class="computeroutput"><span class="identifier">A</span></code>,
- <code class="computeroutput"><span class="identifier">P</span></code>, and <code class="computeroutput"><span class="identifier">S</span></code> are the types of their attributes,
- then the type of the attribute exposed by <code class="computeroutput"><span class="identifier">confix</span><span class="special">(</span><span class="identifier">p</span><span class="special">,</span> <span class="identifier">s</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]</span></code> will be <code class="computeroutput"><span class="identifier">A</span></code>.
- </p></td></tr>
- </table></div>
- <h6>
- <a name="spirit_repository.qi_components.directives.confix.h5"></a>
- <span class="phrase"><a name="spirit_repository.qi_components.directives.confix.example"></a></span><a class="link" href="confix.html#spirit_repository.qi_components.directives.confix.example">Example</a>
- </h6>
- <p>
- The following example shows simple use cases of the <code class="computeroutput"><span class="identifier">confix</span></code>
- directive. We will illustrate its usage by generating parsers for different
- comment styles and for some simple tagged data (for the full example code
- see <a href="../../../../../example/qi/confix.cpp" target="_top">confix.cpp</a>)
- </p>
- <h6>
- <a name="spirit_repository.qi_components.directives.confix.h6"></a>
- <span class="phrase"><a name="spirit_repository.qi_components.directives.confix.prerequisites"></a></span><a class="link" href="confix.html#spirit_repository.qi_components.directives.confix.prerequisites">Prerequisites</a>
- </h6>
- <p>
- In addition to the main header file needed to include the core components
- implemented in <span class="emphasis"><em>Spirit.Qi</em></span> we add the header file needed
- for the new <code class="computeroutput"><span class="identifier">confix</span></code> directive.
- </p>
- <p>
- </p>
- <pre class="programlisting"><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</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></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">repository</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">qi_confix</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
- </pre>
- <p>
- </p>
- <p>
- In order to make the examples below more readable we import a number of
- elements into the current namespace:
- </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">eol</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">lexeme</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">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">char_</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">space</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">qi</span><span class="special">::</span><span class="identifier">parse</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">qi</span><span class="special">::</span><span class="identifier">phrase_parse</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">repository</span><span class="special">::</span><span class="identifier">confix</span><span class="special">;</span>
- </pre>
- <p>
- </p>
- <h6>
- <a name="spirit_repository.qi_components.directives.confix.h7"></a>
- <span class="phrase"><a name="spirit_repository.qi_components.directives.confix.parsing_different_comment_styles"></a></span><a class="link" href="confix.html#spirit_repository.qi_components.directives.confix.parsing_different_comment_styles">Parsing
- Different Comment Styles</a>
- </h6>
- <p>
- We will show how to parse different comment styles. First we will parse
- a C++ comment:
- </p>
- <p>
- </p>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">></span>
- <span class="keyword">bool</span> <span class="identifier">parse_cpp_comment</span><span class="special">(</span><span class="identifier">Iterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">Iterator</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">attr</span><span class="special">)</span>
- <span class="special">{</span>
- <span class="keyword">bool</span> <span class="identifier">r</span> <span class="special">=</span> <span class="identifier">parse</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span>
- <span class="identifier">confix</span><span class="special">(</span><span class="string">"//"</span><span class="special">,</span> <span class="identifier">eol</span><span class="special">)[*(</span><span class="identifier">char_</span> <span class="special">-</span> <span class="identifier">eol</span><span class="special">)],</span> <span class="comment">// grammar</span>
- <span class="identifier">attr</span><span class="special">);</span> <span class="comment">// attribute</span>
- <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">r</span> <span class="special">||</span> <span class="identifier">first</span> <span class="special">!=</span> <span class="identifier">last</span><span class="special">)</span> <span class="comment">// fail if we did not get a full match</span>
- <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span>
- <span class="keyword">return</span> <span class="identifier">r</span><span class="special">;</span>
- <span class="special">}</span>
- </pre>
- <p>
- </p>
- <p>
- This function will obviously parse input such as "<code class="computeroutput"><span class="comment">//
- This is a comment \n </span></code>". Similarily parsing a 'C'-style
- comment proves to be straightforward:
- </p>
- <p>
- </p>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">></span>
- <span class="keyword">bool</span> <span class="identifier">parse_c_comment</span><span class="special">(</span><span class="identifier">Iterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">Iterator</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">attr</span><span class="special">)</span>
- <span class="special">{</span>
- <span class="keyword">bool</span> <span class="identifier">r</span> <span class="special">=</span> <span class="identifier">parse</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span>
- <span class="identifier">confix</span><span class="special">(</span><span class="string">"/*"</span><span class="special">,</span> <span class="string">"*/"</span><span class="special">)[*(</span><span class="identifier">char_</span> <span class="special">-</span> <span class="string">"*/"</span><span class="special">)],</span> <span class="comment">// grammar</span>
- <span class="identifier">attr</span><span class="special">);</span> <span class="comment">// attribute</span>
- <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">r</span> <span class="special">||</span> <span class="identifier">first</span> <span class="special">!=</span> <span class="identifier">last</span><span class="special">)</span> <span class="comment">// fail if we did not get a full match</span>
- <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span>
- <span class="keyword">return</span> <span class="identifier">r</span><span class="special">;</span>
- <span class="special">}</span>
- </pre>
- <p>
- </p>
- <p>
- which again will be able to parse e.g. "<code class="computeroutput"><span class="comment">/*
- This is a comment */</span> </code>".
- </p>
- <h6>
- <a name="spirit_repository.qi_components.directives.confix.h8"></a>
- <span class="phrase"><a name="spirit_repository.qi_components.directives.confix.parsing_tagged_data"></a></span><a class="link" href="confix.html#spirit_repository.qi_components.directives.confix.parsing_tagged_data">Parsing
- Tagged Data</a>
- </h6>
- <p>
- Generating a parser that extracts the body from the HTML snippet "<code class="computeroutput"><span class="special"><</span><span class="identifier">b</span><span class="special">></span><span class="identifier">The</span> <span class="identifier">Body</span><span class="special"></</span><span class="identifier">b</span><span class="special">></span></code>"
- is not very hard, either:
- </p>
- <p>
- </p>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">></span>
- <span class="keyword">bool</span> <span class="identifier">parse_tagged</span><span class="special">(</span><span class="identifier">Iterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">Iterator</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">attr</span><span class="special">)</span>
- <span class="special">{</span>
- <span class="keyword">bool</span> <span class="identifier">r</span> <span class="special">=</span> <span class="identifier">phrase_parse</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span>
- <span class="identifier">confix</span><span class="special">(</span><span class="string">"<b>"</span><span class="special">,</span> <span class="string">"</b>"</span><span class="special">)[</span><span class="identifier">lexeme</span><span class="special">[*(</span><span class="identifier">char_</span> <span class="special">-</span> <span class="char">'<'</span><span class="special">)]],</span> <span class="comment">// grammar</span>
- <span class="identifier">space</span><span class="special">,</span> <span class="comment">// skip</span>
- <span class="identifier">attr</span><span class="special">);</span> <span class="comment">// attribute</span>
- <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">r</span> <span class="special">||</span> <span class="identifier">first</span> <span class="special">!=</span> <span class="identifier">last</span><span class="special">)</span> <span class="comment">// fail if we did not get a full match</span>
- <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span>
- <span class="keyword">return</span> <span class="identifier">r</span><span class="special">;</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 © 2001-2011 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="../directives.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../directives.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="distinct.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a>
- </div>
- </body>
- </html>
|