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| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="spirit.lex.reference.lexer_api"></a><a class="link" href="lexer_api.html" title="Lexer API">Lexer API</a> |
| </h4></div></div></div> |
| <a name="spirit.lex.reference.lexer_api.description"></a><h6> |
| <a name="id1148652"></a> |
| <a class="link" href="lexer_api.html#spirit.lex.reference.lexer_api.description">Description</a> |
| </h6> |
| <p> |
| The library provides a couple of free functions to make using the lexer |
| a snap. These functions have three forms. The first form, <code class="computeroutput"><span class="identifier">tokenize</span></code>, simplifies the usage of a stand |
| alone lexer (without parsing). The second form, <code class="computeroutput"><span class="identifier">tokenize_and_parse</span></code>, |
| combines a lexer step with parsing on the token level (without a skipper). |
| The third, <code class="computeroutput"><span class="identifier">tokenize_and_phrase_parse</span></code>, |
| works on the token level as well, but additionally employs a skip parser. |
| The latter two versions can take in attributes by reference that will hold |
| the parsed values on a successful parse. |
| </p> |
| <a name="spirit.lex.reference.lexer_api.header"></a><h6> |
| <a name="id1148690"></a> |
| <a class="link" href="lexer_api.html#spirit.lex.reference.lexer_api.header">Header</a> |
| </h6> |
| <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/lex/tokenize_and_parse.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">lex_tokenize_and_parse</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| <p> |
| For variadic attributes: |
| </p> |
| <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/lex/tokenize_and_parse_attr.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">lex_tokenize_and_parse_attr</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| <p> |
| The variadic attributes version of the API allows one or more attributes |
| to be passed into the API functions. The functions taking two or more attributes |
| are usable when the parser expression is a <a class="link" href="../../qi/reference/operator/sequence.html" title="Sequence (a >> b)">Sequence</a> |
| only. In this case each of the attributes passed have to match the corresponding |
| part of the sequence. |
| </p> |
| <p> |
| Also, see <a class="link" href="../../structure/include.html" title="Include">Include Structure</a>. |
| </p> |
| <a name="spirit.lex.reference.lexer_api.namespace"></a><h6> |
| <a name="id1148829"></a> |
| <a class="link" href="lexer_api.html#spirit.lex.reference.lexer_api.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">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">lex</span><span class="special">::</span><span class="identifier">tokenize</span></code> |
| </p> |
| </td></tr> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">lex</span><span class="special">::</span><span class="identifier">tokenize_and_parse</span></code> |
| </p> |
| </td></tr> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">lex</span><span class="special">::</span><span class="identifier">tokenize_and_phrase_parse</span></code> |
| </p> |
| </td></tr> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><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">skip_flag</span><span class="special">::</span><span class="identifier">postskip</span></code> |
| </p> |
| </td></tr> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><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">skip_flag</span><span class="special">::</span><span class="identifier">dont_postskip</span></code> |
| </p> |
| </td></tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.lex.reference.lexer_api.synopsis"></a><h6> |
| <a name="id1149083"></a> |
| <a class="link" href="lexer_api.html#spirit.lex.reference.lexer_api.synopsis">Synopsis</a> |
| </h6> |
| <p> |
| The <code class="computeroutput"><span class="identifier">tokenize</span></code> function is |
| one of the main lexer API functions. It simplifies using a lexer to tokenize |
| a given input sequence. It's main purpose is to use the lexer to tokenize |
| all the input. |
| </p> |
| <p> |
| Both functions take a pair of iterators spanning the underlying input stream |
| to scan, the lexer object (built from the token definitions), and an (optional) |
| functor being called for each of the generated tokens. If no function object |
| <code class="computeroutput"><span class="identifier">f</span></code> is given, the generated |
| tokens will be discarded. |
| </p> |
| <p> |
| The functions return <code class="computeroutput"><span class="keyword">true</span></code> |
| if the scanning of the input succeeded (the given input sequence has been |
| successfully matched by the given token definitions). |
| </p> |
| <p> |
| The argument <code class="computeroutput"><span class="identifier">f</span></code> is expected |
| to be a function (callable) object taking a single argument of the token |
| type and returning a bool, indicating whether the tokenization should be |
| canceled. If it returns <code class="computeroutput"><span class="keyword">false</span></code> |
| the function <code class="computeroutput"><span class="identifier">tokenize</span></code> will |
| return <code class="computeroutput"><span class="keyword">false</span></code> as well. |
| </p> |
| <p> |
| The <code class="computeroutput"><span class="identifier">initial_state</span></code> argument |
| forces lexing to start with the given lexer state. If this is omitted lexing |
| starts in the <code class="computeroutput"><span class="string">"INITIAL"</span></code> |
| state. |
| </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">typename</span> <span class="identifier">Lexer</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="keyword">bool</span> |
| <span class="identifier">tokenize</span><span class="special">(</span> |
| <span class="identifier">Iterator</span><span class="special">&</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">Lexer</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">lex</span> |
| <span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Lexer</span><span class="special">::</span><span class="identifier">char_type</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">initial_state</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span> |
| |
| <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">typename</span> <span class="identifier">Lexer</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">F</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="keyword">bool</span> |
| <span class="identifier">tokenize</span><span class="special">(</span> |
| <span class="identifier">Iterator</span><span class="special">&</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">Lexer</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">lex</span> |
| <span class="special">,</span> <span class="identifier">F</span> <span class="identifier">f</span> |
| <span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Lexer</span><span class="special">::</span><span class="identifier">char_type</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">initial_state</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span> |
| </pre> |
| <p> |
| The <code class="computeroutput"><span class="identifier">tokenize_and_parse</span></code> |
| function is one of the main lexer API functions. It simplifies using a |
| lexer as the underlying token source while parsing a given input sequence. |
| </p> |
| <p> |
| The functions take a pair of iterators spanning the underlying input stream |
| to parse, the lexer object (built from the token definitions) and a parser |
| object (built from the parser grammar definition). Additionally they may |
| take the attributes for the parser step. |
| </p> |
| <p> |
| The function returns <code class="computeroutput"><span class="keyword">true</span></code> |
| if the parsing succeeded (the given input sequence has been successfully |
| matched by the given grammar). |
| </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">typename</span> <span class="identifier">Lexer</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">ParserExpr</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="keyword">bool</span> |
| <span class="identifier">tokenize_and_parse</span><span class="special">(</span> |
| <span class="identifier">Iterator</span><span class="special">&</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">Lexer</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">lex</span> |
| <span class="special">,</span> <span class="identifier">ParserExpr</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">expr</span><span class="special">)</span> |
| |
| <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">typename</span> <span class="identifier">Lexer</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">ParserExpr</span> |
| <span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">AttrN</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="keyword">bool</span> |
| <span class="identifier">tokenize_and_parse</span><span class="special">(</span> |
| <span class="identifier">Iterator</span><span class="special">&</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">Lexer</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">lex</span> |
| <span class="special">,</span> <span class="identifier">ParserExpr</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">expr</span> |
| <span class="special">,</span> <span class="identifier">Attr1</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">attr1</span><span class="special">,</span> <span class="identifier">Attr2</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">AttrN</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">attrN</span><span class="special">);</span> |
| </pre> |
| <p> |
| The functions <code class="computeroutput"><span class="identifier">tokenize_and_phrase_parse</span></code> |
| take a pair of iterators spanning the underlying input stream to parse, |
| the lexer object (built from the token definitions) and a parser object |
| (built from the parser grammar definition). The additional skipper parameter |
| will be used as the skip parser during the parsing process. Additionally |
| they may take the attributes for the parser step. |
| </p> |
| <p> |
| The function returns <code class="computeroutput"><span class="keyword">true</span></code> |
| if the parsing succeeded (the given input sequence has been successfully |
| matched by the given grammar). |
| </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">typename</span> <span class="identifier">Lexer</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">ParserExpr</span> |
| <span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Skipper</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="keyword">bool</span> |
| <span class="identifier">tokenize_and_phrase_parse</span><span class="special">(</span> |
| <span class="identifier">Iterator</span><span class="special">&</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">Lexer</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">lex</span> |
| <span class="special">,</span> <span class="identifier">ParserExpr</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">expr</span> |
| <span class="special">,</span> <span class="identifier">Skipper</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">skipper</span> |
| <span class="special">,</span> <span class="identifier">BOOST_SCOPED_ENUM</span><span class="special">(</span><span class="identifier">skip_flag</span><span class="special">)</span> <span class="identifier">post_skip</span> <span class="special">=</span> <span class="identifier">skip_flag</span><span class="special">::</span><span class="identifier">postskip</span><span class="special">);</span> |
| |
| <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">typename</span> <span class="identifier">Lexer</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">ParserExpr</span> |
| <span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Skipper</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">AttrN</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="keyword">bool</span> |
| <span class="identifier">tokenize_and_phrase_parse</span><span class="special">(</span> |
| <span class="identifier">Iterator</span><span class="special">&</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">Lexer</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">lex</span> |
| <span class="special">,</span> <span class="identifier">ParserExpr</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">expr</span> |
| <span class="special">,</span> <span class="identifier">Skipper</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">skipper</span> |
| <span class="special">,</span> <span class="identifier">Attr1</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">attr1</span><span class="special">,</span> <span class="identifier">Attr2</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">AttrN</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">attrN</span><span class="special">);</span> |
| |
| <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">typename</span> <span class="identifier">Lexer</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">ParserExpr</span> |
| <span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Skipper</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">AttrN</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="keyword">bool</span> |
| <span class="identifier">tokenize_and_phrase_parse</span><span class="special">(</span> |
| <span class="identifier">Iterator</span><span class="special">&</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">Lexer</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">lex</span> |
| <span class="special">,</span> <span class="identifier">ParserExpr</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">expr</span> |
| <span class="special">,</span> <span class="identifier">Skipper</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">skipper</span> |
| <span class="special">,</span> <span class="identifier">BOOST_SCOPED_ENUM</span><span class="special">(</span><span class="identifier">skip_flag</span><span class="special">)</span> <span class="identifier">post_skip</span> |
| <span class="special">,</span> <span class="identifier">Attr1</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">attr1</span><span class="special">,</span> <span class="identifier">Attr2</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">AttrN</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">attrN</span><span class="special">);</span> |
| </pre> |
| <p> |
| The maximum number of supported arguments is limited by the preprocessor |
| constant <code class="computeroutput"><span class="identifier">SPIRIT_ARGUMENTS_LIMIT</span></code>. |
| This constant defaults to the value defined by the preprocessor constant |
| <code class="computeroutput"><span class="identifier">PHOENIX_LIMIT</span></code> (which in |
| turn defaults to <code class="computeroutput"><span class="number">10</span></code>). |
| </p> |
| <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 variadic function with two or more attributes internally combine |
| references to all passed attributes into a <code class="computeroutput"><span class="identifier">fusion</span><span class="special">::</span><span class="identifier">vector</span></code> |
| and forward this as a combined attribute to the corresponding one attribute |
| function. |
| </p></td></tr> |
| </table></div> |
| <p> |
| The <code class="computeroutput"><span class="identifier">tokenize_and_phrase_parse</span></code> |
| functions not taking an explicit <code class="computeroutput"><span class="identifier">skip_flag</span></code> |
| as one of their arguments invoke the passed skipper after a successful |
| match of the parser expression. This can be inhibited by using the other |
| versions of that function while passing <code class="computeroutput"><span class="identifier">skip_flag</span><span class="special">::</span><span class="identifier">dont_postskip</span></code> |
| to the corresponding argument. |
| </p> |
| <a name="spirit.lex.reference.lexer_api.template_parameters"></a><h6> |
| <a name="id1153077"></a> |
| <a class="link" href="lexer_api.html#spirit.lex.reference.lexer_api.template_parameters">Template |
| 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">Iterator</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <a href="http://www.sgi.com/tech/stl/ForwardIterator.html" target="_top"><code class="computeroutput"><span class="identifier">ForwardIterator</span></code></a> pointing |
| to the underlying input sequence to parse. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Lexer</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A lexer (token definition) object. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">F</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A function object called for each generated token. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ParserExpr</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| An expression that can be converted to a Qi parser. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Skipper</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Parser used to skip white spaces. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Attr1</span></code>, <code class="computeroutput"><span class="identifier">Attr2</span></code>, ..., <code class="computeroutput"><span class="identifier">AttrN</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| One or more attributes. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </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> |
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