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Example code of nathanntg/lite-lexer

Informations about the package lite-lexer

lite-lexer

A light-weight PHP-based string lexer. By defining parser blocks, a simple syntax can be defined. The parser will then build a tree representing the parsed string. This can then be interpreted for other uses.

I created this for a simple query language to read custom data from a model system, but it can easily be adapted to other syntaxes. It has relatively low overhead, and based on my testing performed fast (enough so for my application).

Installation

This package is available via composer and can be added to a project using the command:

Usage

The recommended usage is to subclass LiteLexer\Parser to define your own syntax blocks (see the example implementation). Then you can run your parser as follows:

Example Implementation

The example folder contains a QueryParser class that implements the parser needed to read a basic query language. Specifically, given an input string like the following:

It will produce the following parse tree:

Testing

You can run the PHPUnit tests using the following command (assuming installed via composer, and includes the developer requirements):

All versions of lite-lexer with dependencies

PHP Build Version
Package Version
Requires php Version >=5.3.0
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