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Informations about the package phlexy
Phlexy
This project is a followup to my post on fast lexing in PHP. It contains a few lexer implementations (both stateless and stateful) and related performance tests.
Usage
Lexers are created from a lexer definition using a factory class.
For example, if you want to create a MARK based stateless CSV lexer, you can use the following code:
Similarly a stateful lexer:
For an example of a stateful lexer definition, you can look the definition for lexing PHP source code.
Performance
A performance comparison for the different lexer implementations can be done using the performance testing script:
Stateless\Simple and Stateful\Simple are trivial lexer implementations (which loop through the regular expressions).
Stateless\WithoutCapturingGroups, Stateless\WithCapturingGroups and Stateful\UsingCompiledRegex use the compiled
regex approach described in the blog post mentioned above.
Stateless\UsingPregReplace is an extension of the compiled regex approach, where the looping through the regular
expression is done by (mis)using preg_replace_callback.
Stateless\UsingMarks and Stateful\UsingMark use the (*MARK) mechanism that was exposed in PHP 5.5.
As the above performance measurments show, the Simple approach is a good bit slower than using a compiled regex approach. Mark based implementation perform much better than group offset based ones. The benefits increase with lexer size: For the CSV lexer there is relatively little difference, while for the PHP lexer the mark based implementation is 25x faster than the naive one.
