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| <div class="section"> |
| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="spirit.qi.reference.directive.repeat"></a><a class="link" href="repeat.html" title="Repetition (repeat[])">Repetition |
| (<code class="computeroutput"><span class="identifier">repeat</span><span class="special">[]</span></code>)</a> |
| </h5></div></div></div> |
| <a name="spirit.qi.reference.directive.repeat.description"></a><h6> |
| <a name="id892172"></a> |
| <a class="link" href="repeat.html#spirit.qi.reference.directive.repeat.description">Description</a> |
| </h6> |
| <p> |
| The <code class="computeroutput"><span class="identifier">repeat</span><span class="special">[]</span></code> |
| provides a more powerful and flexible mechanism for repeating a parser. |
| There are grammars that are impractical and cumbersome, if not impossible, |
| for the basic EBNF iteration syntax (<a class="link" href="../operator/kleene.html" title="Kleene (*a)">Kleene</a> |
| and the <a class="link" href="../operator/plus.html" title="Plus (+a)">Plus</a>) |
| to specify. Examples: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| A file name may have a maximum of 255 characters only. |
| </li> |
| <li class="listitem"> |
| A specific bitmap file format has exactly 4096 RGB color information. |
| </li> |
| <li class="listitem"> |
| A 256 bit binary string (1..256 1s or 0s). |
| </li> |
| </ul></div> |
| <a name="spirit.qi.reference.directive.repeat.header"></a><h6> |
| <a name="id892235"></a> |
| <a class="link" href="repeat.html#spirit.qi.reference.directive.repeat.header">Header</a> |
| </h6> |
| <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/qi/directive/repeat.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_repeat</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.directive.repeat.namespace"></a><h6> |
| <a name="id893538"></a> |
| <a class="link" href="repeat.html#spirit.qi.reference.directive.repeat.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">repeat</span> <span class="comment">// |
| alias: boost::spirit::qi::repeat</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">inf</span> <span class="comment">// alias: |
| boost::spirit::qi::inf</span></code> |
| </p> |
| </td></tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.qi.reference.directive.repeat.model_of"></a><h6> |
| <a name="id893655"></a> |
| <a class="link" href="repeat.html#spirit.qi.reference.directive.repeat.model_of">Model of</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| <a class="link" href="../parser_concepts/unaryparser.html" title="UnaryParser"><code class="computeroutput"><span class="identifier">UnaryParser</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">a</span></code></span></dt> |
| <dd><p> |
| A <a class="link" href="../parser_concepts/parser.html" title="Parser"><code class="computeroutput"><span class="identifier">Parser</span></code></a>. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">n</span></code>, <code class="computeroutput"><span class="identifier">min</span></code>, <code class="computeroutput"><span class="identifier">max</span></code></span></dt> |
| <dd><p> |
| An <code class="computeroutput"><span class="keyword">int</span></code> anything that |
| can be converted to an <code class="computeroutput"><span class="keyword">int</span></code>, |
| or a <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy |
| Argument</a> that evaluates to anything that can be converted |
| to an <code class="computeroutput"><span class="keyword">int</span></code>. |
| </p></dd> |
| </dl> |
| </div> |
| <a name="spirit.qi.reference.directive.repeat.expression_semantics"></a><h6> |
| <a name="id893784"></a> |
| <a class="link" href="repeat.html#spirit.qi.reference.directive.repeat.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="../parser_concepts/unaryparser.html" title="UnaryParser"><code class="computeroutput"><span class="identifier">UnaryParser</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> |
| <code class="computeroutput"><span class="identifier">repeat</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Repeat <code class="computeroutput"><span class="identifier">a</span></code> zero |
| or more times. Same as <a class="link" href="../operator/kleene.html" title="Kleene (*a)">Kleene</a>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">repeat</span><span class="special">(</span><span class="identifier">n</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Repeat <code class="computeroutput"><span class="identifier">a</span></code> exactly |
| <code class="computeroutput"><span class="identifier">n</span></code> times. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">repeat</span><span class="special">(</span><span class="identifier">min</span><span class="special">,</span> |
| <span class="identifier">max</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Repeat <code class="computeroutput"><span class="identifier">a</span></code> at |
| least <code class="computeroutput"><span class="identifier">min</span></code> times |
| and at most <code class="computeroutput"><span class="identifier">max</span></code> |
| times. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">repeat</span><span class="special">(</span><span class="identifier">min</span><span class="special">,</span> |
| <span class="identifier">inf</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Repeat <code class="computeroutput"><span class="identifier">a</span></code> at |
| least <code class="computeroutput"><span class="identifier">min</span></code> or |
| more (continuing until <code class="computeroutput"><span class="identifier">a</span></code> |
| fails or the input is consumed). |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.qi.reference.directive.repeat.attributes"></a><h6> |
| <a name="id894100"></a> |
| <a class="link" href="repeat.html#spirit.qi.reference.directive.repeat.attributes">Attributes</a> |
| </h6> |
| <p> |
| See <a class="link" href="../../quick_reference/compound_attribute_rules.html#spirit.qi.quick_reference.compound_attribute_rules.notation">Compound |
| Attribute Notation</a>. |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Expression |
| </p> |
| </th> |
| <th> |
| <p> |
| Attribute |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">repeat</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| |
| </p> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">a</span><span class="special">:</span> <span class="identifier">A</span> <span class="special">--></span> <span class="identifier">repeat</span><span class="special">[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">vector</span><span class="special"><</span><span class="identifier">A</span><span class="special">></span> |
| <span class="identifier">a</span><span class="special">:</span> <span class="identifier">Unused</span> <span class="special">--></span> <span class="identifier">repeat</span><span class="special">[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">Unused</span></pre> |
| <p> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">repeat</span><span class="special">(</span><span class="identifier">n</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| |
| </p> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">a</span><span class="special">:</span> <span class="identifier">A</span> <span class="special">--></span> <span class="identifier">repeat</span><span class="special">(</span><span class="identifier">n</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">vector</span><span class="special"><</span><span class="identifier">A</span><span class="special">></span> |
| <span class="identifier">a</span><span class="special">:</span> <span class="identifier">Unused</span> <span class="special">--></span> <span class="identifier">repeat</span><span class="special">(</span><span class="identifier">n</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">Unused</span></pre> |
| <p> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">repeat</span><span class="special">(</span><span class="identifier">min</span><span class="special">,</span> |
| <span class="identifier">max</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| |
| </p> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">a</span><span class="special">:</span> <span class="identifier">A</span> <span class="special">--></span> <span class="identifier">repeat</span><span class="special">(</span><span class="identifier">min</span><span class="special">,</span> <span class="identifier">max</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">vector</span><span class="special"><</span><span class="identifier">A</span><span class="special">></span> |
| <span class="identifier">a</span><span class="special">:</span> <span class="identifier">Unused</span> <span class="special">--></span> <span class="identifier">repeat</span><span class="special">(</span><span class="identifier">min</span><span class="special">,</span> <span class="identifier">max</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">Unused</span></pre> |
| <p> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">repeat</span><span class="special">(</span><span class="identifier">min</span><span class="special">,</span> |
| <span class="identifier">inf</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| |
| </p> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">a</span><span class="special">:</span> <span class="identifier">A</span> <span class="special">--></span> <span class="identifier">repeat</span><span class="special">(</span><span class="identifier">min</span><span class="special">,</span> <span class="identifier">inf</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">vector</span><span class="special"><</span><span class="identifier">A</span><span class="special">></span> |
| <span class="identifier">a</span><span class="special">:</span> <span class="identifier">Unused</span> <span class="special">--></span> <span class="identifier">repeat</span><span class="special">(</span><span class="identifier">min</span><span class="special">,</span> <span class="identifier">inf</span><span class="special">)[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">Unused</span></pre> |
| <p> |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.qi.reference.directive.repeat.complexity"></a><h6> |
| <a name="id894778"></a> |
| <a class="link" href="repeat.html#spirit.qi.reference.directive.repeat.complexity">Complexity</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| The overall complexity is defined by the complexity of its subject |
| parser. The complexity of <code class="computeroutput"><span class="identifier">repeat</span></code> |
| itself is O(N), where N is the number of repetitions to execute. |
| </p></blockquote></div> |
| <a name="spirit.qi.reference.directive.repeat.example"></a><h6> |
| <a name="id894806"></a> |
| <a class="link" href="repeat.html#spirit.qi.reference.directive.repeat.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="../basics.html#spirit.qi.reference.basics.examples">Basics Examples</a> |
| section. |
| </p></td></tr> |
| </table></div> |
| <p> |
| Using the repeat directive, we can now write our examples above. |
| </p> |
| <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">qi</span><span class="special">::</span><span class="identifier">repeat</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">lit</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">uint_parser</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">_1</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">namespace</span> <span class="identifier">phx</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">;</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| A parser for a file name with a maximum of 255 characters: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">test_parser</span><span class="special">(</span><span class="string">"batman.jpeg"</span><span class="special">,</span> <span class="identifier">repeat</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">255</span><span class="special">)[</span><span class="identifier">char_</span><span class="special">(</span><span class="string">"a-zA-Z_./"</span><span class="special">)]);</span></pre> |
| <p> |
| </p> |
| <p> |
| A parser for a specific bitmap file format which has exactly 4096 RGB |
| color information. (for the purpose of this example, we will be testing |
| only 3 RGB color information.) |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">uint_parser</span><span class="special"><</span><span class="keyword">unsigned</span><span class="special">,</span> <span class="number">16</span><span class="special">,</span> <span class="number">6</span><span class="special">,</span> <span class="number">6</span><span class="special">></span> <span class="identifier">rgb</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">unsigned</span><span class="special">></span> <span class="identifier">colors</span><span class="special">;</span> |
| <span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"ffffff0000003f3f3f"</span><span class="special">,</span> <span class="identifier">repeat</span><span class="special">(</span><span class="number">3</span><span class="special">)[</span><span class="identifier">rgb</span><span class="special">],</span> <span class="identifier">colors</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">std</span><span class="special">::</span><span class="identifier">hex</span> |
| <span class="special"><<</span> <span class="identifier">colors</span><span class="special">[</span><span class="number">0</span><span class="special">]</span> <span class="special"><<</span> <span class="char">','</span> |
| <span class="special"><<</span> <span class="identifier">colors</span><span class="special">[</span><span class="number">1</span><span class="special">]</span> <span class="special"><<</span> <span class="char">','</span> |
| <span class="special"><<</span> <span class="identifier">colors</span><span class="special">[</span><span class="number">2</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> |
| A 256 bit binary string (1..256 1s or 0s). (For the purpose of this example, |
| we will be testing only 16 bits.) |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">test_parser</span><span class="special">(</span><span class="string">"1011101011110010"</span><span class="special">,</span> <span class="identifier">repeat</span><span class="special">(</span><span class="number">16</span><span class="special">)[</span><span class="identifier">lit</span><span class="special">(</span><span class="char">'1'</span><span class="special">)</span> <span class="special">|</span> <span class="char">'0'</span><span class="special">]);</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| The Loop parsers can be dynamic. Consider the parsing of a binary file |
| of Pascal-style length prefixed string, where the first byte determines |
| the length of the incoming string. Here's a sample input: |
| </p> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| <span class="inlinemediaobject"><img src="../../../.././images/pascal_string.png" alt="pascal_string"></span> |
| </p></blockquote></div> |
| <p> |
| This trivial example cannot be practically defined in traditional EBNF. |
| Although some EBNF variants allow more powerful repetition constructs |
| other than the Kleene Star, we are still limited to parsing fixed strings. |
| The nature of EBNF forces the repetition factor to be a constant. On |
| the other hand, Spirit allows the repetition factor to be variable at |
| run time. We could write a grammar that accepts the input string above. |
| Example using phoenix: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">str</span><span class="special">;</span> |
| <span class="keyword">int</span> <span class="identifier">n</span><span class="special">;</span> |
| <span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"\x0bHello World"</span><span class="special">,</span> |
| <span class="identifier">char_</span><span class="special">[</span><span class="identifier">phx</span><span class="special">::</span><span class="identifier">ref</span><span class="special">(</span><span class="identifier">n</span><span class="special">)</span> <span class="special">=</span> <span class="identifier">_1</span><span class="special">]</span> <span class="special">>></span> <span class="identifier">repeat</span><span class="special">(</span><span class="identifier">phx</span><span class="special">::</span><span class="identifier">ref</span><span class="special">(</span><span class="identifier">n</span><span class="special">))[</span><span class="identifier">char_</span><span class="special">],</span> <span class="identifier">str</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">n</span> <span class="special"><<</span> <span class="char">','</span> <span class="special"><<</span> <span class="identifier">str</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> <span class="comment">// will print "11,Hello World" |
| </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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