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| <div class="section"> |
| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="spirit.karma.reference.nonterminal.grammar"></a><a class="link" href="grammar.html" title="Grammar">Grammar</a> |
| </h5></div></div></div> |
| <a name="spirit.karma.reference.nonterminal.grammar.description"></a><h6> |
| <a name="id1060861"></a> |
| <a class="link" href="grammar.html#spirit.karma.reference.nonterminal.grammar.description">Description</a> |
| </h6> |
| <p> |
| The grammar encapsulates a set of <a class="link" href="rule.html" title="Rule">rules</a> |
| (as well as primitive generators (<a class="link" href="../generator_concepts/primitivegenerator.html" title="PrimitiveGenerator"><code class="computeroutput"><span class="identifier">PrimitiveGenerator</span></code></a>) and sub-grammars). |
| The grammar is the main mechanism for modularization and composition. |
| Grammars can be composed to form more complex grammars. |
| </p> |
| <a name="spirit.karma.reference.nonterminal.grammar.header"></a><h6> |
| <a name="id1060895"></a> |
| <a class="link" href="grammar.html#spirit.karma.reference.nonterminal.grammar.header">Header</a> |
| </h6> |
| <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/karma/nonterminal/grammar.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">karma_grammar</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.karma.reference.nonterminal.grammar.namespace"></a><h6> |
| <a name="id1061516"></a> |
| <a class="link" href="grammar.html#spirit.karma.reference.nonterminal.grammar.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">karma</span><span class="special">::</span><span class="identifier">grammar</span></code> |
| </p> |
| </td></tr></tbody> |
| </table></div> |
| <a name="spirit.karma.reference.nonterminal.grammar.synopsis"></a><h6> |
| <a name="id1061596"></a> |
| <a class="link" href="grammar.html#spirit.karma.reference.nonterminal.grammar.synopsis">Synopsis</a> |
| </h6> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A2</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A3</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">grammar</span><span class="special">;</span> |
| </pre> |
| <a name="spirit.karma.reference.nonterminal.grammar.template_parameters"></a><h6> |
| <a name="id1061690"></a> |
| <a class="link" href="grammar.html#spirit.karma.reference.nonterminal.grammar.template_parameters">Template |
| parameters</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Parameter |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| <th> |
| <p> |
| Default |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">OutputIterator</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The underlying output iterator type that the rule is expected |
| to work on. |
| </p> |
| </td> |
| <td> |
| <p> |
| none |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">A1</span></code>, <code class="computeroutput"><span class="identifier">A2</span></code>, <code class="computeroutput"><span class="identifier">A3</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Either <code class="computeroutput"><span class="identifier">Signature</span></code>, |
| <code class="computeroutput"><span class="identifier">Delimiter</span></code> or |
| <code class="computeroutput"><span class="identifier">Locals</span></code> in any |
| order. See table below. |
| </p> |
| </td> |
| <td> |
| <p> |
| See table below. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p> |
| Here is more information about the template parameters: |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Parameter |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| <th> |
| <p> |
| Default |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Signature</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Specifies the grammar's synthesized (return value) and inherited |
| attributes (arguments). More on this here: <a class="link" href="../generator_concepts/nonterminal.html" title="Nonterminal"><code class="computeroutput"><span class="identifier">Nonterminal</span></code></a>. |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">unused_type</span></code>. |
| When <code class="computeroutput"><span class="identifier">Signature</span></code> |
| defaults to <code class="computeroutput"><span class="identifier">unused_type</span></code>, |
| the effect is the same as specifying a signature of <code class="computeroutput"><span class="keyword">void</span><span class="special">()</span></code> |
| which is also equivalent to <code class="computeroutput"><span class="identifier">unused_type</span><span class="special">()</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Delimiter</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Specifies the grammar's delimiter generator. Specify this if |
| you want the grammar to delimit the generated output. |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">unused_type</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Locals</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Specifies the grammar's local variables. See <a class="link" href="../generator_concepts/nonterminal.html" title="Nonterminal"><code class="computeroutput"><span class="identifier">Nonterminal</span></code></a>. |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">unused_type</span></code> |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.karma.reference.nonterminal.grammar.model_of"></a><h6> |
| <a name="id1062069"></a> |
| <a class="link" href="grammar.html#spirit.karma.reference.nonterminal.grammar.model_of">Model |
| of</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| <a class="link" href="../generator_concepts/nonterminal.html" title="Nonterminal"><code class="computeroutput"><span class="identifier">Nonterminal</span></code></a> |
| </p></blockquote></div> |
| <div class="variablelist"> |
| <p class="title"><b>Notation</b></p> |
| <dl> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">g</span></code></span></dt> |
| <dd><p> |
| A grammar |
| </p></dd> |
| </dl> |
| </div> |
| <a name="spirit.karma.reference.nonterminal.grammar.expression_semantics"></a><h6> |
| <a name="id1062128"></a> |
| <a class="link" href="grammar.html#spirit.karma.reference.nonterminal.grammar.expression_semantics">Expression |
| Semantics</a> |
| </h6> |
| <p> |
| Semantics of an expression is defined only where it differs from, or |
| is not defined in <a class="link" href="../generator_concepts/nonterminal.html" title="Nonterminal"><code class="computeroutput"><span class="identifier">Nonterminal</span></code></a>. |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Expression |
| </p> |
| </th> |
| <th> |
| <p> |
| Semantics |
| </p> |
| </th> |
| </tr></thead> |
| <tbody><tr> |
| <td> |
| <p> |
| |
| </p> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">OutputIterator</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">my_grammar</span> <span class="special">:</span> <span class="identifier">grammar</span><span class="special"><</span><span class="identifier">OutputIterator</span><span class="special">,</span> <span class="identifier">A1</span><span class="special">,</span> <span class="identifier">A2</span><span class="special">,</span> <span class="identifier">A3</span><span class="special">></span> |
| <span class="special">{</span> |
| <span class="identifier">my_grammar</span><span class="special">()</span> <span class="special">:</span> <span class="identifier">my_grammar</span><span class="special">::</span><span class="identifier">base_type</span><span class="special">(</span><span class="identifier">start</span><span class="special">,</span> <span class="identifier">name</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="comment">// Rule definitions |
| </span> <span class="identifier">start</span> <span class="special">=</span> <span class="comment">/* ... */</span><span class="special">;</span> |
| <span class="special">}</span> |
| |
| <span class="identifier">rule</span><span class="special"><</span><span class="identifier">OutputIterator</span><span class="special">,</span> <span class="identifier">A1</span><span class="special">,</span> <span class="identifier">A2</span><span class="special">,</span> <span class="identifier">A3</span><span class="special">></span> <span class="identifier">start</span><span class="special">;</span> |
| <span class="comment">// more rule declarations... |
| </span><span class="special">};</span> |
| </pre> |
| <p> |
| </p> |
| </td> |
| <td> |
| <p> |
| Grammar definition. <code class="computeroutput"><span class="identifier">name</span></code> |
| is an optional string that gives the grammar its name, useful |
| for debugging. |
| </p> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <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 template parameters of a grammar and its start rule (the rule passed |
| to the grammar's base class constructor) must match, otherwise you |
| will see compilation errors. |
| </p></td></tr> |
| </table></div> |
| <a name="spirit.karma.reference.nonterminal.grammar.attributes"></a><h6> |
| <a name="id1062443"></a> |
| <a class="link" href="grammar.html#spirit.karma.reference.nonterminal.grammar.attributes">Attributes</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| The generator attribute of the grammar is <code class="computeroutput"><span class="identifier">RT</span></code>, |
| its consumed attribute. See <a class="link" href="../generator_concepts/nonterminal.html#spirit.karma.reference.generator_concepts.nonterminal.attributes"><code class="computeroutput"><span class="identifier">Attribute</span></code></a> |
| </p></blockquote></div> |
| <a name="spirit.karma.reference.nonterminal.grammar.complexity"></a><h6> |
| <a name="id1062482"></a> |
| <a class="link" href="grammar.html#spirit.karma.reference.nonterminal.grammar.complexity">Complexity</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| The complexity is defined by the complexity of the its definition. |
| </p></blockquote></div> |
| <a name="spirit.karma.reference.nonterminal.grammar.example"></a><h6> |
| <a name="id1062502"></a> |
| <a class="link" href="grammar.html#spirit.karma.reference.nonterminal.grammar.example">Example</a> |
| </h6> |
| <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 test harness for the example(s) below is presented in the <a class="link" href="../karma_basics.html#spirit.karma.reference.karma_basics.examples">Basics Examples</a> |
| section. |
| </p></td></tr> |
| </table></div> |
| <p> |
| Some using declarations: |
| </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">ascii</span><span class="special">::</span><span class="identifier">space_type</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">int_</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">karma</span><span class="special">::</span><span class="identifier">grammar</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">karma</span><span class="special">::</span><span class="identifier">rule</span><span class="special">;</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| Basic grammar usage: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">num_list</span> <span class="special">:</span> <span class="identifier">grammar</span><span class="special"><</span><span class="identifier">output_iterator_type</span><span class="special">,</span> <span class="identifier">space_type</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">>()></span> |
| <span class="special">{</span> |
| <span class="identifier">num_list</span><span class="special">()</span> <span class="special">:</span> <span class="identifier">base_type</span><span class="special">(</span><span class="identifier">start</span><span class="special">)</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">int_</span><span class="special">;</span> |
| <span class="identifier">num</span> <span class="special">=</span> <span class="identifier">int_</span><span class="special">;</span> |
| <span class="identifier">start</span> <span class="special">=</span> <span class="identifier">num</span> <span class="special"><<</span> <span class="special">*(</span><span class="char">','</span> <span class="special"><<</span> <span class="identifier">num</span><span class="special">);</span> |
| <span class="special">}</span> |
| |
| <span class="identifier">rule</span><span class="special"><</span><span class="identifier">output_iterator_type</span><span class="special">,</span> <span class="identifier">space_type</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">>()></span> <span class="identifier">start</span><span class="special">;</span> |
| <span class="identifier">rule</span><span class="special"><</span><span class="identifier">output_iterator_type</span><span class="special">,</span> <span class="identifier">space_type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">()></span> <span class="identifier">num</span><span class="special">;</span> |
| <span class="special">};</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| How to use the example grammar: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">num_list</span> <span class="identifier">nlist</span><span class="special">;</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">v</span><span class="special">;</span> |
| <span class="identifier">v</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="number">123</span><span class="special">);</span> |
| <span class="identifier">v</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="number">456</span><span class="special">);</span> |
| <span class="identifier">v</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="number">789</span><span class="special">);</span> |
| <span class="identifier">test_generator_attr_delim</span><span class="special">(</span><span class="string">"123 , 456 , 789"</span><span class="special">,</span> <span class="identifier">nlist</span><span class="special">,</span> <span class="identifier">space</span><span class="special">,</span> <span class="identifier">v</span><span class="special">);</span> |
| </pre> |
| <p> |
| </p> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2001-2010 Joel de Guzman, Hartmut Kaiser<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
| </p> |
| </div></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
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