Parle\RLexer::push
(PECL parle >= 0.5.1)
Parle\RLexer::push — Add a lexer rule
Description
$regex
, int $id
) : void$state
, string $regex
, int $id
, string $newState
) : void$state
, string $regex
, string $newState
) : voidPush a pattern for lexeme recognition.
A 'start state' and 'exit state' can be specified by using a suitable signature.
Parameters
-
regex -
Regular expression used for token matching.
-
id -
Token id. If the lexer instance is meant to be used standalone, this can be an arbitrary number. If the lexer instance is going to be passed to the parser, it has to be an id returned by Parle\RParser::tokenid().
-
state -
State name. If '*' is used as start state, then the rule is applied to all lexer states.
-
newState -
New state name, after the rule was applied.
If '.' is specified as the exit state, then the lexer state is unchanged when that rule matches. An exit state with '>' before the name means push. Use the signature without id for either continuation or to start matching, when a continuation or recursion is required.
If '<' is specified as exit state, it means pop. In that case, the signature containing the id can be used to identify the match. Note that even in the case an id is specified, the rule will finish first when all the previous pushes popped.
English translation
You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.
Thank you in advance.
Document created the 30/01/2003, last modified the 26/10/2018
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References
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