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| <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> |
| <a name="spirit_repository.qi_components.directives.confix.description"></a><h6> |
| <a name="id761680"></a> |
| <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> |
| <a name="spirit_repository.qi_components.directives.confix.header"></a><h6> |
| <a name="id762520"></a> |
| <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> |
| <a name="spirit_repository.qi_components.directives.confix.synopsis"></a><h6> |
| <a name="id762608"></a> |
| <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> |
| <a name="spirit_repository.qi_components.directives.confix.parameters"></a><h6> |
| <a name="id762664"></a> |
| <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> |
| <a name="spirit_repository.qi_components.directives.confix.attribute"></a><h6> |
| <a name="id762814"></a> |
| <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> |
| <a name="spirit_repository.qi_components.directives.confix.example"></a><h6> |
| <a name="id763077"></a> |
| <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> |
| <a name="spirit_repository.qi_components.directives.confix.prerequisites"></a><h6> |
| <a name="id763116"></a> |
| <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> |
| <a name="spirit_repository.qi_components.directives.confix.parsing_different_comment_styles"></a><h6> |
| <a name="id763572"></a> |
| <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> |
| <a name="spirit_repository.qi_components.directives.confix.parsing_tagged_data"></a><h6> |
| <a name="id764198"></a> |
| <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> |
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| <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>) |
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