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Informations about the package lex
Lex
Lex is a library for lexical analysis in PHP. Currently, only simple regular expression lexers are available; but considering that you shouldn't be lexing anything complex in php, this should be fine :).
Installation
Usage
The following program would output
TokenStream
A token stream is a simple interface for consuming one token at a time. This is very useful for Recursive Decent Parsers
API
Lexers
Each lexer will accept a string input and then return an iterable of MatchedToken
lexer($token_map, $throw = true)
Main lexer which lexes the strings based off of the $token_map. $throw determines whether or not the lexer should throw an exception on unrecognized input.
skipLexer($lex, $tokens)
Lexer decorator which will skip any Matched Tokens in the set of the $tokens passed in.
tokenStreamLexer($lex)
Lexer decorator that will convert the output of the $lex into a TokenStream
mockLexer($tokens)
Returns $tokens as is.
class MatchedToken
$match
Returns the text that was matched.
$token
Returns the token name that was matched.
$offset
Returns the string offset at which the match started.
interface TokenStream extends \IteratorAggregate
getToken()
Returns the current token and advances the internal pointer up by one.
peek()
Returns the current token but does not advance the internal pointer
isEmpty()
returns true if the token stream is empty, false if not.
