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| <div class="section"> |
| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="spirit.qi.reference.parse_api.stream_api"></a><a class="link" href="stream_api.html" title="Stream Based Parser API">Stream |
| Based Parser API</a> |
| </h5></div></div></div> |
| <a name="spirit.qi.reference.parse_api.stream_api.description"></a><h6> |
| <a name="id852457"></a> |
| <a class="link" href="stream_api.html#spirit.qi.reference.parse_api.stream_api.description">Description</a> |
| </h6> |
| <p> |
| The library provides a couple of Standard IO <a href="http://www.cppreference.com/wiki/io/io_flags#manipulators" target="_top">Manipulators</a> |
| allowing to integrate <span class="emphasis"><em>Spirit.Qi</em></span> input parsing facilities |
| with Standard input streams. These parser manipulators have two forms. |
| The first form, <code class="computeroutput"><span class="identifier">match</span></code>, |
| works on the character level. The second <code class="computeroutput"><span class="identifier">phrase_match</span></code> |
| works on the phrase level and requires a skip parser. Both versions can |
| take in attributes by reference that will hold the parsed values on a |
| successful parse. |
| </p> |
| <a name="spirit.qi.reference.parse_api.stream_api.header"></a><h6> |
| <a name="id852499"></a> |
| <a class="link" href="stream_api.html#spirit.qi.reference.parse_api.stream_api.header">Header</a> |
| </h6> |
| <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/qi/stream/match_manip.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_match</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/qi/stream/match_manip_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">qi_match_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 parse manipulators. The manipulators taking two |
| or more attributes are usable when the parser expression is a <a class="link" href="../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> |
| For the API functions deducing the correct (matching) parser type from |
| the supplied attribute type: |
| </p> |
| <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/qi/match_auto.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_match_auto</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.parse_api.stream_api.namespace"></a><h6> |
| <a name="id852695"></a> |
| <a class="link" href="stream_api.html#spirit.qi.reference.parse_api.stream_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">qi</span><span class="special">::</span><span class="identifier">match</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">phrase_match</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.qi.reference.parse_api.stream_api.synopsis"></a><h6> |
| <a name="id852908"></a> |
| <a class="link" href="stream_api.html#spirit.qi.reference.parse_api.stream_api.synopsis">Synopsis</a> |
| </h6> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">spirit</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">qi</span> |
| <span class="special">{</span> |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Expr</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="special"><</span><span class="identifier">unspecified</span><span class="special">></span> |
| <span class="identifier">match</span><span class="special">(</span> |
| <span class="identifier">Expr</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">xpr</span><span class="special">);</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Expr</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="special"><</span><span class="identifier">unspecified</span><span class="special">></span> |
| <span class="identifier">match</span><span class="special">(</span> |
| <span class="identifier">Expr</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">xpr</span> |
| <span class="special">,</span> <span class="identifier">Attr1</span><span class="special">&</span> <span class="identifier">attr1</span><span class="special">,</span> <span class="identifier">Attr2</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="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">Expr</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="special"><</span><span class="identifier">unspecified</span><span class="special">></span> |
| <span class="identifier">phrase_match</span><span class="special">(</span> |
| <span class="identifier">Expr</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">s</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">Expr</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="special"><</span><span class="identifier">unspecified</span><span class="special">></span> |
| <span class="identifier">phrase_match</span><span class="special">(</span> |
| <span class="identifier">Expr</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">s</span> |
| <span class="special">,</span> <span class="identifier">Attr1</span><span class="special">&</span> <span class="identifier">attr1</span><span class="special">,</span> <span class="identifier">Attr2</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="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">Expr</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="special"><</span><span class="identifier">unspecified</span><span class="special">></span> |
| <span class="identifier">phrase_match</span><span class="special">(</span> |
| <span class="identifier">Expr</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">s</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="special">&</span> <span class="identifier">attr1</span><span class="special">,</span> <span class="identifier">Attr2</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="special">&</span> <span class="identifier">attrN</span><span class="special">);</span> |
| <span class="special">}}}</span> |
| </pre> |
| <p> |
| <span class="emphasis"><em>Spirit.Qi</em></span> parser API functions based on the automatic |
| creation of the matching parser type: |
| </p> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">spirit</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">qi</span> |
| <span class="special">{</span> |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Attr</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="special"><</span><span class="identifier">unspecified</span><span class="special">></span> |
| <span class="identifier">match</span><span class="special">(</span> |
| <span class="identifier">Attr</span><span class="special">&</span> <span class="identifier">attr</span><span class="special">);</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Attr</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="special"><</span><span class="identifier">unspecified</span><span class="special">></span> |
| <span class="identifier">phrase_match</span><span class="special">(</span> |
| <span class="identifier">Attr</span><span class="special">&</span> <span class="identifier">attr</span> |
| <span class="special">,</span> <span class="identifier">Skipper</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">s</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="special">}}}</span> |
| </pre> |
| <p> |
| All functions above return a standard IO stream manipulator instance |
| (see <a href="http://www.cppreference.com/wiki/io/io_flags#manipulators" target="_top">Manipulators</a>), |
| which when streamed from an input stream will result in parsing the input |
| using the embedded <span class="emphasis"><em>Spirit.Qi</em></span> parser expression. |
| Any error (or failed parse) occurring during the invocation of the <span class="emphasis"><em>Spirit.Qi</em></span> |
| parsers will be reflected in the streams status flag (<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code> |
| will be set). |
| </p> |
| <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 manipulators 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 manipulator |
| taking one attribute. |
| </p></td></tr> |
| </table></div> |
| <p> |
| The <code class="computeroutput"><span class="identifier">phrase_match</span></code> manipulators |
| 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 manipulator 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.qi.reference.parse_api.stream_api.template_parameters"></a><h6> |
| <a name="id854322"></a> |
| <a class="link" href="stream_api.html#spirit.qi.reference.parse_api.stream_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">Expr</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">Attr</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| An attribute type utilized to create the corresponding parser |
| type from. |
| </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> |
| <hr> |
| <div class="spirit-nav"> |
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