Peast is PHP library that generates AST for JavaScript code





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v1.16.2 2024-03-05 09:16 UTC


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Peast (PHP ECMAScript Abstract Syntax Tree) is a PHP 5.4+ library that parses JavaScript code, according to ECMAScript specification, and generates an abstract syntax tree following the ESTree standard.


Include the following requirement to your composer.json:

	"require": {
		"mck89/peast": "dev-master"

Run composer install to install the package.

Then in your script include the autoloader and you can start using Peast:

require_once "vendor/autoload.php";

$source = "var a = 1"; // Your JavaScript code
$ast = Peast\Peast::latest($source, $options)->parse(); // Parse it!

Known issues

When Xdebug is enabled and Peast is used to scan code that contains deeply nested functions, this fatal error can appear:

PHP Fatal error:  Maximum function nesting level of '512' reached, aborting!


PHP Warning:  Uncaught Error: Xdebug has detected a possible infinite loop, and aborted your script with a stack depth of '256' frames

To prevent this you can set xdebug.max_nesting_level to a higher value, such as 512.


Read the documentation for more examples and explanations:

  1. AST generation and tokenization
  2. Tree Traversing
  3. Querying By Selector
  4. Rendering