| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>NaryLexer</title> |
| <link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css"> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.75.0"> |
| <link rel="home" href="../../../../index.html" title="Spirit 2.4.1"> |
| <link rel="up" href="../lexer_concepts.html" title="Lexer Concepts"> |
| <link rel="prev" href="unarylexer.html" title="UnaryLexer"> |
| <link rel="next" href="../lex_basics.html" title="Basics"> |
| </head> |
| <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> |
| <table cellpadding="2" width="100%"><tr> |
| <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td> |
| <td align="center"><a href="../../../../../../../../index.html">Home</a></td> |
| <td align="center"><a href="../../../../../../../../libs/libraries.htm">Libraries</a></td> |
| <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> |
| <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> |
| <td align="center"><a href="../../../../../../../../more/index.htm">More</a></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="unarylexer.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../lexer_concepts.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../lex_basics.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="spirit.lex.reference.lexer_concepts.narylexer"></a><a class="link" href="narylexer.html" title="NaryLexer">NaryLexer</a> |
| </h5></div></div></div> |
| <a name="spirit.lex.reference.lexer_concepts.narylexer.description"></a><h6> |
| <a name="id1147650"></a> |
| <a class="link" href="narylexer.html#spirit.lex.reference.lexer_concepts.narylexer.description">Description</a> |
| </h6> |
| <p> |
| <span class="emphasis"><em>NaryLexer</em></span> is a composite lexer component that has |
| one or more subjects. The NaryLexer allows its subjects to be treated |
| in the same way as a single instance of a <a class="link" href="lexer.html" title="Lexer"><code class="computeroutput"><span class="identifier">Lexer</span></code></a> following the Composite |
| Design Pattern. |
| </p> |
| <a name="spirit.lex.reference.lexer_concepts.narylexer.refinement_of"></a><h6> |
| <a name="id1147686"></a> |
| <a class="link" href="narylexer.html#spirit.lex.reference.lexer_concepts.narylexer.refinement_of">Refinement |
| of</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| <a class="link" href="lexer.html" title="Lexer"><code class="computeroutput"><span class="identifier">Lexer</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">l</span></code></span></dt> |
| <dd><p> |
| A NaryLexer. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">L</span></code></span></dt> |
| <dd><p> |
| A NaryLexer type. |
| </p></dd> |
| </dl> |
| </div> |
| <a name="spirit.lex.reference.lexer_concepts.narylexer.valid_expressions"></a><h6> |
| <a name="id1147766"></a> |
| <a class="link" href="narylexer.html#spirit.lex.reference.lexer_concepts.narylexer.valid_expressions">Valid |
| Expressions</a> |
| </h6> |
| <p> |
| In addition to the requirements defined in <a class="link" href="lexer.html" title="Lexer"><code class="computeroutput"><span class="identifier">Lexer</span></code></a>, for any NaryLexer the |
| following must be met: |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Expression |
| </p> |
| </th> |
| <th> |
| <p> |
| Semantics |
| </p> |
| </th> |
| <th> |
| <p> |
| Return type |
| </p> |
| </th> |
| </tr></thead> |
| <tbody><tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">l</span><span class="special">.</span><span class="identifier">elements</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The tuple of elements. |
| </p> |
| </td> |
| <td> |
| <p> |
| A <a href="../../../../../../../../libs/fusion/doc/html/index.html" target="_top">Boost.Fusion</a> |
| Sequence of <a class="link" href="lexer.html" title="Lexer"><code class="computeroutput"><span class="identifier">Lexer</span></code></a> types. |
| </p> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <a name="spirit.lex.reference.lexer_concepts.narylexer.type_expressions"></a><h6> |
| <a name="id1147894"></a> |
| <a class="link" href="narylexer.html#spirit.lex.reference.lexer_concepts.narylexer.type_expressions">Type |
| Expressions</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Expression |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">l</span><span class="special">.</span><span class="identifier">elements_type</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Elements tuple type. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_nary_lexer</span><span class="special"><</span><span class="identifier">L</span><span class="special">>::</span><span class="identifier">type</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Metafunction that evaluates to <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code> |
| if a certain type, <code class="computeroutput"><span class="identifier">L</span></code> |
| is a NaryLexer, <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></code> |
| otherwise (See <a href="../../../../../../../../libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL |
| Boolean Constant</a>). |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.lex.reference.lexer_concepts.narylexer.invariants"></a><h6> |
| <a name="id1148205"></a> |
| <a class="link" href="narylexer.html#spirit.lex.reference.lexer_concepts.narylexer.invariants">Invariants</a> |
| </h6> |
| <p> |
| For each element, <code class="computeroutput"><span class="identifier">E</span></code>, |
| in any NaryLexer, <code class="computeroutput"><span class="identifier">L</span></code>, |
| the following invariant always holds: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| <code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_lexer</span><span class="special"><</span><span class="identifier">E</span><span class="special">>::</span><span class="identifier">type</span></code> evaluates to <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code> |
| </li></ul></div> |
| <a name="spirit.lex.reference.lexer_concepts.narylexer.models"></a><h6> |
| <a name="id1148294"></a> |
| <a class="link" href="narylexer.html#spirit.lex.reference.lexer_concepts.narylexer.models">Models</a> |
| </h6> |
| <p> |
| The following lexer components conform to this model: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| lexer sequence component |
| </li></ul></div> |
| <p> |
| <span class="bold"><strong>FIXME</strong></span> Add more links to models of NaryLexer |
| concept |
| </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"> |
| <a accesskey="p" href="unarylexer.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../lexer_concepts.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../lex_basics.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |
