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- <title>Karma Confix Generator</title>
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- </div>
- <div class="section">
- <div class="titlepage"><div><div><h4 class="title">
- <a name="spirit_repository.karma_components.directives.karma_confix_generator"></a><a class="link" href="karma_confix_generator.html" title="Karma Confix Generator">Karma
- Confix Generator</a>
- </h4></div></div></div>
- <h6>
- <a name="spirit_repository.karma_components.directives.karma_confix_generator.h0"></a>
- <span class="phrase"><a name="spirit_repository.karma_components.directives.karma_confix_generator.description"></a></span><a class="link" href="karma_confix_generator.html#spirit_repository.karma_components.directives.karma_confix_generator.description">Description</a>
- </h6>
- <p>
- The <span class="emphasis"><em>Spirit.Karma</em></span> <code class="computeroutput"><span class="identifier">confix</span></code>
- generator is a generator directive component allowing to embed any generated
- ouput inside an opening (a prefix) and a closing (a suffix). A simple example
- is a C comment: <code class="computeroutput"><span class="comment">/* This is a C comment */</span></code>
- which can be generated using the <code class="computeroutput"><span class="identifier">confix</span></code>
- generator as: <code class="computeroutput"><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="string">"This is a C comment"</span><span class="special">]</span></code>.
- The general syntax for using the <code class="computeroutput"><span class="identifier">confix</span></code>
- is:
- </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>
- which results in generating a sequence equivalent to
- </p>
- <pre class="programlisting"><span class="identifier">prefix</span> <span class="special"><<</span> <span class="identifier">subject</span> <span class="special"><<</span> <span class="identifier">suffix</span>
- </pre>
- <p>
- Using the <code class="computeroutput"><span class="identifier">confix</span></code> component
- instead of the explicit sequence has the advantage of being able to encapsulate
- the prefix and the suffix into a separate generator construct. The following
- code snippet illustrates the idea:
- </p>
- <pre class="programlisting"><span class="comment">// Define a metafunction allowing to compute the type of the confix()</span>
- <span class="comment">// construct</span>
- <span class="keyword">namespace</span> <span class="identifier">traits</span>
- <span class="special">{</span>
- <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">;</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="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">repository</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="special">};</span>
- <span class="comment">// Define a helper function allowing to create a confix() construct from </span>
- <span class="comment">// arbitrary prefix and suffix generators</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="keyword">typename</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">confix_spec</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">type</span>
- <span class="identifier">confix_spec</span><span class="special">(</span><span class="identifier">Prefix</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">prefix</span><span class="special">,</span> <span class="identifier">Suffix</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">suffix</span><span class="special">)</span>
- <span class="special">{</span>
- <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">;</span>
- <span class="keyword">return</span> <span class="identifier">repository</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="comment">// Define a helper function to construct a HTML tag from the tag name</span>
- <span class="keyword">inline</span> <span class="keyword">typename</span> <span class="identifier">traits</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="identifier">tag</span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">tagname</span><span class="special">)</span>
- <span class="special">{</span>
- <span class="keyword">return</span> <span class="identifier">confix_spec</span><span class="special">(</span><span class="string">"<"</span> <span class="special">+</span> <span class="identifier">tagname</span> <span class="special">+</span> <span class="string">">"</span><span class="special">,</span> <span class="string">"</"</span> <span class="special">+</span> <span class="identifier">tagname</span> <span class="special">+</span> <span class="string">">"</span><span class="special">);</span>
- <span class="special">}</span>
- <span class="comment">// Define generators for different HTML tags the HTML tag</span>
- <span class="keyword">typedef</span> <span class="identifier">traits</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="identifier">ol</span> <span class="special">=</span> <span class="identifier">tag</span><span class="special">(</span><span class="string">"ol"</span><span class="special">);</span> <span class="comment">// <ol>...</ol> </span>
- <span class="keyword">typedef</span> <span class="identifier">traits</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="identifier">li</span> <span class="special">=</span> <span class="identifier">tag</span><span class="special">(</span><span class="string">"li"</span><span class="special">);</span> <span class="comment">// <li>...</li> </span>
- </pre>
- <p>
- Now, for instance, the above definitions allow to generate the HTML 'ol'
- tag using a simple: <code class="computeroutput"><span class="identifier">ol</span><span class="special">[</span><span class="string">"Some text"</span><span class="special">]</span></code> (which results in <code class="computeroutput"><span class="special"><</span><span class="identifier">ol</span><span class="special">></span><span class="identifier">Some</span> <span class="identifier">text</span><span class="special"></</span><span class="identifier">ol</span><span class="special">></span></code>).
- </p>
- <h6>
- <a name="spirit_repository.karma_components.directives.karma_confix_generator.h1"></a>
- <span class="phrase"><a name="spirit_repository.karma_components.directives.karma_confix_generator.header"></a></span><a class="link" href="karma_confix_generator.html#spirit_repository.karma_components.directives.karma_confix_generator.header">Header</a>
- </h6>
- <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/repository/home/karma/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">karma_confix</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
- </pre>
- <h6>
- <a name="spirit_repository.karma_components.directives.karma_confix_generator.h2"></a>
- <span class="phrase"><a name="spirit_repository.karma_components.directives.karma_confix_generator.synopsis"></a></span><a class="link" href="karma_confix_generator.html#spirit_repository.karma_components.directives.karma_confix_generator.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>
- <h6>
- <a name="spirit_repository.karma_components.directives.karma_confix_generator.h3"></a>
- <span class="phrase"><a name="spirit_repository.karma_components.directives.karma_confix_generator.parameters"></a></span><a class="link" href="karma_confix_generator.html#spirit_repository.karma_components.directives.karma_confix_generator.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 generator construct to use to format the opening (the prefix).
- The prefix is the part generated <span class="emphasis"><em>before</em></span>
- any output as generated by the <code class="computeroutput"><span class="identifier">subject</span></code>.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">suffix</span></code>
- </p>
- </td>
- <td>
- <p>
- The generator construct to use to format the ending (the suffix).
- The suffix is the part generated <span class="emphasis"><em>after</em></span> any
- output as generated by the <code class="computeroutput"><span class="identifier">subject</span></code>.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">subject</span></code>
- </p>
- </td>
- <td>
- <p>
- The generator construct to use to format the actual output in
- 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 arbitrary complex generators themselves.
- </p>
- <h6>
- <a name="spirit_repository.karma_components.directives.karma_confix_generator.h4"></a>
- <span class="phrase"><a name="spirit_repository.karma_components.directives.karma_confix_generator.attribute"></a></span><a class="link" href="karma_confix_generator.html#spirit_repository.karma_components.directives.karma_confix_generator.attribute">Attribute</a>
- </h6>
- <p>
- The <code class="computeroutput"><span class="identifier">confix</span></code> component 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">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> is generator,
- and <code class="computeroutput"><span class="identifier">A</span></code> is the type of
- the attribute of generator <code class="computeroutput"><span class="identifier">a</span></code>,
- 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>
- as well.
- </p></td></tr>
- </table></div>
- <h6>
- <a name="spirit_repository.karma_components.directives.karma_confix_generator.h5"></a>
- <span class="phrase"><a name="spirit_repository.karma_components.directives.karma_confix_generator.example"></a></span><a class="link" href="karma_confix_generator.html#spirit_repository.karma_components.directives.karma_confix_generator.example">Example</a>
- </h6>
- <p>
- The following example shows simple use cases of the <code class="computeroutput"><span class="identifier">confix</span></code>
- generator. We will illustrate its usage by generating different comment
- styles and a function prototype (for the full example code see here: <a href="../../../../../example/karma/confix.cpp" target="_top">confix.cpp</a>)
- </p>
- <h6>
- <a name="spirit_repository.karma_components.directives.karma_confix_generator.h6"></a>
- <span class="phrase"><a name="spirit_repository.karma_components.directives.karma_confix_generator.prerequisites"></a></span><a class="link" href="karma_confix_generator.html#spirit_repository.karma_components.directives.karma_confix_generator.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.Karma</em></span> we add the header file
- needed for the new <code class="computeroutput"><span class="identifier">confix</span></code>
- generator.
- </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">karma</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">karma_confix</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
- </pre>
- <p>
- </p>
- <p>
- To make all the code below more readable we introduce the following namespaces.
- </p>
- <p>
- </p>
- <pre class="programlisting"><span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">;</span>
- <span class="keyword">using</span> <span class="keyword">namespace</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="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>
- <h6>
- <a name="spirit_repository.karma_components.directives.karma_confix_generator.h7"></a>
- <span class="phrase"><a name="spirit_repository.karma_components.directives.karma_confix_generator.generating_different_comment_styles"></a></span><a class="link" href="karma_confix_generator.html#spirit_repository.karma_components.directives.karma_confix_generator.generating_different_comment_styles">Generating
- Different Comment Styles</a>
- </h6>
- <p>
- We will show how to generate different comment styles. First we will generate
- a C++ comment:
- </p>
- <p>
- </p>
- <pre class="programlisting"><span class="comment">// C++ comment</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span>
- <span class="identifier">karma</span><span class="special">::</span><span class="identifier">format_delimited</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">string</span><span class="special">],</span> <span class="comment">// format description</span>
- <span class="identifier">space</span><span class="special">,</span> <span class="comment">// delimiter</span>
- <span class="string">"This is a comment"</span> <span class="comment">// data</span>
- <span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
- </pre>
- <p>
- </p>
- <p>
- This code snippet will obviouly generate <code class="computeroutput"><span class="comment">//
- This is a comment \n </span></code>. Similarily generating a 'C'-style
- comment proves to be straightforward:
- </p>
- <p>
- </p>
- <pre class="programlisting"><span class="comment">// C comment</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span>
- <span class="identifier">karma</span><span class="special">::</span><span class="identifier">format_delimited</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">string</span><span class="special">],</span> <span class="comment">// format description</span>
- <span class="identifier">space</span><span class="special">,</span> <span class="comment">// delimiter</span>
- <span class="string">"This is a comment"</span> <span class="comment">// data</span>
- <span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
- </pre>
- <p>
- </p>
- <p>
- which again will generate <code class="computeroutput"><span class="comment">/* This is a comment
- */</span> </code>.
- </p>
- <h6>
- <a name="spirit_repository.karma_components.directives.karma_confix_generator.h8"></a>
- <span class="phrase"><a name="spirit_repository.karma_components.directives.karma_confix_generator.generating_a_function_prototype"></a></span><a class="link" href="karma_confix_generator.html#spirit_repository.karma_components.directives.karma_confix_generator.generating_a_function_prototype">Generating
- a Function Prototype</a>
- </h6>
- <p>
- Generating a function prototype given a function name a vector or parameter
- names is simple as well:
- </p>
- <p>
- </p>
- <pre class="programlisting"><span class="comment">// Generate a function call with an arbitrary parameter list</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</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">parameters</span><span class="special">;</span>
- <span class="identifier">parameters</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="string">"par1"</span><span class="special">);</span>
- <span class="identifier">parameters</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="string">"par2"</span><span class="special">);</span>
- <span class="identifier">parameters</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="string">"par3"</span><span class="special">);</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span>
- <span class="identifier">karma</span><span class="special">::</span><span class="identifier">format</span><span class="special">(</span>
- <span class="identifier">string</span> <span class="special"><<</span> <span class="identifier">confix</span><span class="special">(</span><span class="char">'('</span><span class="special">,</span> <span class="char">')'</span><span class="special">)[</span><span class="identifier">string</span> <span class="special">%</span> <span class="char">','</span><span class="special">],</span> <span class="comment">// format description</span>
- <span class="string">"func"</span><span class="special">,</span> <span class="comment">// function name</span>
- <span class="identifier">parameters</span> <span class="comment">// parameter names</span>
- <span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
- </pre>
- <p>
- </p>
- <p>
- which generates the expected output: <code class="computeroutput"><span class="identifier">func</span><span class="special">(</span><span class="identifier">par1</span><span class="special">,</span><span class="identifier">par2</span><span class="special">,</span><span class="identifier">par3</span><span class="special">)</span></code>.
- </p>
- </div>
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- <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>
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