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| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="spirit.lex.abstracts.lexer_semantic_actions"></a><a class="link" href="lexer_semantic_actions.html" title="Lexer Semantic Actions">Lexer |
| Semantic Actions</a> |
| </h4></div></div></div> |
| <p> |
| The main task of a lexer normally is to recognize tokens in the input. |
| Traditionally this has been complemented with the possibility to execute |
| arbitrary code whenever a certain token has been detected. <span class="emphasis"><em>Spirit.Lex</em></span> |
| has been designed to support this mode of operation as well. We borrow |
| from the concept of semantic actions for parsers (<span class="emphasis"><em>Spirit.Qi</em></span>) |
| and generators (<span class="emphasis"><em>Spirit.Karma</em></span>). Lexer semantic actions |
| may be attached to any token definition. These are C++ functions or function |
| objects that are called whenever a token definition successfully recognizes |
| a portion of the input. Say you have a token definition <code class="computeroutput"><span class="identifier">D</span></code>, |
| and a C++ function <code class="computeroutput"><span class="identifier">f</span></code>, you |
| can make the lexer call <code class="computeroutput"><span class="identifier">f</span></code> |
| whenever it matches an input by attaching <code class="computeroutput"><span class="identifier">f</span></code>: |
| </p> |
| <pre class="programlisting"><span class="identifier">D</span><span class="special">[</span><span class="identifier">f</span><span class="special">]</span> |
| </pre> |
| <p> |
| The expression above links <code class="computeroutput"><span class="identifier">f</span></code> |
| to the token definition, <code class="computeroutput"><span class="identifier">D</span></code>. |
| The required prototype of <code class="computeroutput"><span class="identifier">f</span></code> |
| is: |
| </p> |
| <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">f</span> <span class="special">(</span><span class="identifier">Iterator</span><span class="special">&</span> <span class="identifier">start</span><span class="special">,</span> <span class="identifier">Iterator</span><span class="special">&</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">pass_flag</span><span class="special">&</span> <span class="identifier">matched</span><span class="special">,</span> <span class="identifier">Idtype</span><span class="special">&</span> <span class="identifier">id</span><span class="special">,</span> <span class="identifier">Context</span><span class="special">&</span> <span class="identifier">ctx</span><span class="special">);</span> |
| </pre> |
| <div class="variablelist"> |
| <p class="title"><b>where:</b></p> |
| <dl> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">Iterator</span><span class="special">&</span> |
| <span class="identifier">start</span></code></span></dt> |
| <dd><p> |
| This is the iterator pointing to the begin of the matched range in |
| the underlying input sequence. The type of the iterator is the same |
| as specified while defining the type of the <code class="computeroutput"><span class="identifier">lexertl</span><span class="special">::</span><span class="identifier">actor_lexer</span><span class="special"><...></span></code> (its first template parameter). |
| The semantic action is allowed to change the value of this iterator |
| influencing, the matched input sequence. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">Iterator</span><span class="special">&</span> |
| <span class="identifier">end</span></code></span></dt> |
| <dd><p> |
| This is the iterator pointing to the end of the matched range in |
| the underlying input sequence. The type of the iterator is the same |
| as specified while defining the type of the <code class="computeroutput"><span class="identifier">lexertl</span><span class="special">::</span><span class="identifier">actor_lexer</span><span class="special"><...></span></code> (its first template parameter). |
| The semantic action is allowed to change the value of this iterator |
| influencing, the matched input sequence. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">pass_flag</span><span class="special">&</span> |
| <span class="identifier">matched</span></code></span></dt> |
| <dd><p> |
| This value is pre/initialized to <code class="computeroutput"><span class="identifier">pass_normal</span></code>. |
| If the semantic action sets it to <code class="computeroutput"><span class="identifier">pass_fail</span></code> |
| this behaves as if the token has not been matched in the first place. |
| If the semantic action sets this to <code class="computeroutput"><span class="identifier">pass_ignore</span></code> |
| the lexer ignores the current token and tries to match a next token |
| from the input. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">Idtype</span><span class="special">&</span> |
| <span class="identifier">id</span></code></span></dt> |
| <dd><p> |
| This is the token id of the type Idtype (most of the time this will |
| be a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span></code>) for the matched token. |
| The semantic action is allowed to change the value of this token |
| id, influencing the if of the created token. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">Context</span><span class="special">&</span> |
| <span class="identifier">ctx</span></code></span></dt> |
| <dd><p> |
| This is a reference to a lexer specific, unspecified type, providing |
| the context for the current lexer state. It can be used to access |
| different internal data items and is needed for lexer state control |
| from inside a semantic action. |
| </p></dd> |
| </dl> |
| </div> |
| <p> |
| When using a C++ function as the semantic action the following prototypes |
| are allowed as well: |
| </p> |
| <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">f</span> <span class="special">(</span><span class="identifier">Iterator</span><span class="special">&</span> <span class="identifier">start</span><span class="special">,</span> <span class="identifier">Iterator</span><span class="special">&</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">pass_flag</span><span class="special">&</span> <span class="identifier">matched</span><span class="special">,</span> <span class="identifier">Idtype</span><span class="special">&</span> <span class="identifier">id</span><span class="special">);</span> |
| <span class="keyword">void</span> <span class="identifier">f</span> <span class="special">(</span><span class="identifier">Iterator</span><span class="special">&</span> <span class="identifier">start</span><span class="special">,</span> <span class="identifier">Iterator</span><span class="special">&</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">pass_flag</span><span class="special">&</span> <span class="identifier">matched</span><span class="special">);</span> |
| <span class="keyword">void</span> <span class="identifier">f</span> <span class="special">(</span><span class="identifier">Iterator</span><span class="special">&</span> <span class="identifier">start</span><span class="special">,</span> <span class="identifier">Iterator</span><span class="special">&</span> <span class="identifier">end</span><span class="special">);</span> |
| <span class="keyword">void</span> <span class="identifier">f</span> <span class="special">();</span> |
| </pre> |
| <div class="important"><table border="0" summary="Important"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="../../../images/important.png"></td> |
| <th align="left">Important</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| In order to use lexer semantic actions you need to use type <code class="computeroutput"><span class="identifier">lexertl</span><span class="special">::</span><span class="identifier">actor_lexer</span><span class="special"><></span></code> |
| as your lexer class (instead of the type <code class="computeroutput"><span class="identifier">lexertl</span><span class="special">::</span><span class="identifier">lexer</span><span class="special"><></span></code> as described in earlier examples). |
| </p></td></tr> |
| </table></div> |
| <a name="spirit.lex.abstracts.lexer_semantic_actions.the_context_of_a_lexer_semantic_action"></a><h6> |
| <a name="id1135322"></a> |
| <a class="link" href="lexer_semantic_actions.html#spirit.lex.abstracts.lexer_semantic_actions.the_context_of_a_lexer_semantic_action">The |
| context of a lexer semantic action</a> |
| </h6> |
| <p> |
| The last parameter passed to any lexer semantic action is a reference to |
| an unspecified type (see the <code class="computeroutput"><span class="identifier">Context</span></code> |
| type in the table above). This type is unspecified because it depends on |
| the token type returned by the lexer. It is implemented in the internals |
| of the iterator type exposed by the lexer. Nevertheless, any context type |
| is expected to expose a couple of functions allowing to influence the behavior |
| of the lexer. The following table gives an overview and a short description |
| of the available functionality. |
| </p> |
| <div class="table"> |
| <a name="id1135343"></a><p class="title"><b>Table 8. Functions exposed by any context passed to a lexer semantic action</b></p> |
| <div class="table-contents"><table class="table" summary="Functions exposed by any context passed to a lexer semantic action"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Name |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Iterator</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">get_eoi</span><span class="special">()</span> <span class="keyword">const</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The function <code class="computeroutput"><span class="identifier">get_eoi</span><span class="special">()</span></code> may be used by to access the |
| end iterator of the input stream the lexer has been initialized |
| with |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">void</span> <span class="identifier">more</span><span class="special">()</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The function <code class="computeroutput"><span class="identifier">more</span><span class="special">()</span></code> tells the lexer that the next |
| time it matches a rule, the corresponding token should be appended |
| onto the current token value rather than replacing it. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Iterator</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">less</span><span class="special">(</span><span class="identifier">Iterator</span> |
| <span class="keyword">const</span><span class="special">&</span> |
| <span class="identifier">it</span><span class="special">,</span> |
| <span class="keyword">int</span> <span class="identifier">n</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The function <code class="computeroutput"><span class="identifier">less</span><span class="special">()</span></code> returns an iterator positioned |
| to the nth input character beyond the current token start iterator |
| (i.e. by passing the return value to the parameter <code class="computeroutput"><span class="identifier">end</span></code> it is possible to return |
| all but the first n characters of the current token back to the |
| input stream. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">bool</span> <span class="identifier">lookahead</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> |
| <span class="identifier">id</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The function <code class="computeroutput"><span class="identifier">lookahead</span><span class="special">()</span></code> can be used to implement lookahead |
| for lexer engines not supporting constructs like flex' <code class="computeroutput"><span class="identifier">a</span><span class="special">/</span><span class="identifier">b</span></code> (match <code class="computeroutput"><span class="identifier">a</span></code>, |
| but only when followed by <code class="computeroutput"><span class="identifier">b</span></code>). |
| It invokes the lexer on the input following the current token |
| without actually moving forward in the input stream. The function |
| returns whether the lexer was able to match a token with the |
| given token-id <code class="computeroutput"><span class="identifier">id</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">get_state</span><span class="special">()</span> <span class="keyword">const</span></code> |
| and <code class="computeroutput"><span class="keyword">void</span> <span class="identifier">set_state</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> |
| <span class="identifier">state</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The functions <code class="computeroutput"><span class="identifier">get_state</span><span class="special">()</span></code> and <code class="computeroutput"><span class="identifier">set_state</span><span class="special">()</span></code> may be used to introspect and |
| change the current lexer state. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">token_value_type</span> <span class="identifier">get_value</span><span class="special">()</span> |
| <span class="keyword">const</span></code> and <code class="computeroutput"><span class="keyword">void</span> <span class="identifier">set_value</span><span class="special">(</span><span class="identifier">Value</span> |
| <span class="keyword">const</span><span class="special">&)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The functions <code class="computeroutput"><span class="identifier">get_value</span><span class="special">()</span></code> and <code class="computeroutput"><span class="identifier">set_value</span><span class="special">()</span></code> may be used to introspect and |
| change the current token value. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <br class="table-break"><a name="spirit.lex.abstracts.lexer_semantic_actions.lexer_semantic_actions_using_phoenix"></a><h6> |
| <a name="id1135869"></a> |
| <a class="link" href="lexer_semantic_actions.html#spirit.lex.abstracts.lexer_semantic_actions.lexer_semantic_actions_using_phoenix">Lexer |
| Semantic Actions Using Phoenix</a> |
| </h6> |
| <p> |
| Even if it is possible to write your own function object implementations |
| (i.e. using Boost.Lambda or Boost.Bind), the preferred way of defining |
| lexer semantic actions is to use <a href="../../../../../phoenix/doc/html/index.html" target="_top">Boost.Phoenix</a>. |
| In this case you can access the parameters described above by using the |
| predefined <a href="http://boost-spirit.com" target="_top">Spirit</a> placeholders: |
| </p> |
| <div class="table"> |
| <a name="id1135892"></a><p class="title"><b>Table 9. Predefined Phoenix placeholders for lexer semantic actions</b></p> |
| <div class="table-contents"><table class="table" summary="Predefined Phoenix placeholders for lexer semantic actions"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Placeholder |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">_start</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Refers to the iterator pointing to the beginning of the matched |
| input sequence. Any modifications to this iterator value will |
| be reflected in the generated token. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">_end</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Refers to the iterator pointing past the end of the matched input |
| sequence. Any modifications to this iterator value will be reflected |
| in the generated token. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">_pass</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| References the value signaling the outcome of the semantic action. |
| This is pre-initialized to <code class="computeroutput"><span class="identifier">lex</span><span class="special">::</span><span class="identifier">pass_flags</span><span class="special">::</span><span class="identifier">pass_normal</span></code>. |
| If this is set to <code class="computeroutput"><span class="identifier">lex</span><span class="special">::</span><span class="identifier">pass_flags</span><span class="special">::</span><span class="identifier">pass_fail</span></code>, |
| the lexer will behave as if no token has been matched, if is |
| set to <code class="computeroutput"><span class="identifier">lex</span><span class="special">::</span><span class="identifier">pass_flags</span><span class="special">::</span><span class="identifier">pass_ignore</span></code>, the lexer will |
| ignore the current match and proceed trying to match tokens from |
| the input. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">_tokenid</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Refers to the token id of the token to be generated. Any modifications |
| to this value will be reflected in the generated token. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">_val</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Refers to the value the next token will be initialized from. |
| Any modifications to this value will be reflected in the generated |
| token. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">_state</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Refers to the lexer state the input has been match in. Any modifications |
| to this value will be reflected in the lexer itself (the next |
| match will start in the new state). The currently generated token |
| is not affected by changes to this variable. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">_eoi</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| References the end iterator of the overall lexer input. This |
| value cannot be changed. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <br class="table-break"><p> |
| The context object passed as the last parameter to any lexer semantic action |
| is not directly accessible while using <a href="../../../../../phoenix/doc/html/index.html" target="_top">Boost.Phoenix</a> |
| expressions. We rather provide predefined Phoenix functions allowing to |
| invoke the different support functions as mentioned above. The following |
| table lists the available support functions and describes their functionality: |
| </p> |
| <div class="table"> |
| <a name="id1137419"></a><p class="title"><b>Table 10. Support functions usable from Phoenix expressions inside lexer semantic |
| actions</b></p> |
| <div class="table-contents"><table class="table" summary="Support functions usable from Phoenix expressions inside lexer semantic |
| actions"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Plain function |
| </p> |
| </th> |
| <th> |
| <p> |
| Phoenix function |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ctx</span><span class="special">.</span><span class="identifier">more</span><span class="special">()</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">more</span><span class="special">()</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The function <code class="computeroutput"><span class="identifier">more</span><span class="special">()</span></code> tells the lexer that the next |
| time it matches a rule, the corresponding token should be appended |
| onto the current token value rather than replacing it. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ctx</span><span class="special">.</span><span class="identifier">less</span><span class="special">()</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">less</span><span class="special">(</span><span class="identifier">n</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The function <code class="computeroutput"><span class="identifier">less</span><span class="special">()</span></code> takes a single integer parameter |
| <code class="computeroutput"><span class="identifier">n</span></code> and returns |
| an iterator positioned to the nth input character beyond the |
| current token start iterator (i.e. by assigning the return value |
| to the placeholder <code class="computeroutput"><span class="identifier">_end</span></code> |
| it is possible to return all but the first <code class="computeroutput"><span class="identifier">n</span></code> |
| characters of the current token back to the input stream. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ctx</span><span class="special">.</span><span class="identifier">lookahead</span><span class="special">()</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">lookahead</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)</span></code> |
| or <code class="computeroutput"><span class="identifier">lookahead</span><span class="special">(</span><span class="identifier">token_def</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The function <code class="computeroutput"><span class="identifier">lookahead</span><span class="special">()</span></code> takes a single parameter specifying |
| the token to match in the input. The function can be used for |
| instance to implement lookahead for lexer engines not supporting |
| constructs like flex' <code class="computeroutput"><span class="identifier">a</span><span class="special">/</span><span class="identifier">b</span></code> |
| (match <code class="computeroutput"><span class="identifier">a</span></code>, but |
| only when followed by <code class="computeroutput"><span class="identifier">b</span></code>). |
| It invokes the lexer on the input following the current token |
| without actually moving forward in the input stream. The function |
| returns whether the lexer was able to match the specified token. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></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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