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<div class="titlepage"><div><div><h5 class="title">
<a name="spirit.qi.reference.parse_api.iterator_api"></a><a class="link" href="iterator_api.html" title="Iterator Based Parser API"> Iterator
Based Parser API</a>
</h5></div></div></div>
<a name="spirit.qi.reference.parse_api.iterator_api.description"></a><h6>
<a name="id892987"></a>
<a class="link" href="iterator_api.html#spirit.qi.reference.parse_api.iterator_api.description">Description</a>
</h6>
<p>
The library provides a couple of free functions to make parsing a snap.
These parser functions have two forms. The first form <code class="computeroutput"><span class="identifier">parse</span></code>
works on the character level. The second <code class="computeroutput"><span class="identifier">phrase_parse</span></code>
works on the phrase level and requires 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.iterator_api.header"></a><h6>
<a name="id893018"></a>
<a class="link" href="iterator_api.html#spirit.qi.reference.parse_api.iterator_api.header">Header</a>
</h6>
<pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/qi/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">qi_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/qi/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">qi_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 parse functions. The functions taking two or more
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/detail/parse_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_parse_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.iterator_api.namespace"></a><h6>
<a name="id893214"></a>
<a class="link" href="iterator_api.html#spirit.qi.reference.parse_api.iterator_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">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">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.qi.reference.parse_api.iterator_api.synopsis"></a><h6>
<a name="id893428"></a>
<a class="link" href="iterator_api.html#spirit.qi.reference.parse_api.iterator_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">Iterator</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="keyword">bool</span>
<span class="identifier">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">Expr</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">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="keyword">bool</span>
<span class="identifier">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">Expr</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="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">Iterator</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="keyword">bool</span>
<span class="identifier">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">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">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">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="keyword">bool</span>
<span class="identifier">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">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">skipper</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">Iterator</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="keyword">bool</span>
<span class="identifier">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">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">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="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">Iterator</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="keyword">bool</span>
<span class="identifier">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">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">Iterator</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="keyword">bool</span>
<span class="identifier">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">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">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="special">}}}</span>
</pre>
<p>
All functions above return <code class="computeroutput"><span class="keyword">true</span></code>
if none of the involved parser components failed, and <code class="computeroutput"><span class="keyword">false</span></code>
otherwise.
</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 functions 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">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 inhbited 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>
<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 source to parse.
</p>
</td>
</tr>
<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>
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