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<html>
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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>
<h6>
<a name="spirit.qi.reference.parse_api.stream_api.h0"></a>
<span><a name="spirit.qi.reference.parse_api.stream_api.description"></a></span><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>
<h6>
<a name="spirit.qi.reference.parse_api.stream_api.h1"></a>
<span><a name="spirit.qi.reference.parse_api.stream_api.header"></a></span><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 Parser (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>
<h6>
<a name="spirit.qi.reference.parse_api.stream_api.h2"></a>
<span><a name="spirit.qi.reference.parse_api.stream_api.namespace"></a></span><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>
<h6>
<a name="spirit.qi.reference.parse_api.stream_api.h3"></a>
<span><a name="spirit.qi.reference.parse_api.stream_api.synopsis"></a></span><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>
<h6>
<a name="spirit.qi.reference.parse_api.stream_api.h4"></a>
<span><a name="spirit.qi.reference.parse_api.stream_api.template_parameters"></a></span><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 © 2001-2011 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>
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