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Source: ryangjchandler.co.uk
Write a Lexer in PHP with Lexical
I recently released a new PHP package called "Lexical". It provides a set of attributes and objects to build regular expression based lexers in PHP.
As somebody who enjoys experimenting with parsers and text processing, writing lexers has become a somewhat regular task for me.
Lexical provides a set of attributes that can be added to each case in the enumeration: Regex - accepts a single regular expression.
enum TokenType { #[Regex("[0-9]+")] case Number; #[Literal("+")] case Add; #[Literal("-")] case Subtract; #[Literal("*")] case Multiply; #[Literal("/")] case Divide; }
As somebody who enjoys experimenting with parsers and text processing, writing lexers has become a somewhat regular task for me.
Lexical provides a set of attributes that can be added to each case in the enumeration: Regex - accepts a single regular expression.
enum TokenType { #[Regex("[0-9]+")] case Number; #[Literal("+")] case Add; #[Literal("-")] case Subtract; #[Literal("*")] case Multiply; #[Literal("/")] case Divide; }
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