Twig Context Parser

This small script uses the internal Twig tokenize/parser/compiler to obtain a template variable out of its rendering context.

If you are building a flat file Twig CMS based, it might be very useful to work using parsed flat file variable. There are many uses.

This parser basically return all your variables set in Twig using the block set as complex as it might be:

{% set foo = [
    {"bar":"baz"},
    "bar",
    range(0, 12, 2),
    ["yux", {
        "baz":"yea",
        "bar":"foo",
        "range":range(0, 100)
    }]
] %}

Will output:

array(1) {
  'foo' =>
  array(4) {
    [0] =>
    array(1) {
      'bar' =>
      string(3) "baz"
    }
    [1] =>
    string(3) "bar"
    [2] =>
    array(7) {
      [0] =>
      int(0)
      [1] =>
      int(2)
      ...
      [6] =>
      int(12)
    }
    [3] =>
    array(2) {
      [0] =>
      string(3) "yux"
      [1] =>
      array(3) {
        'baz' =>
        string(3) "yea"
        'bar' =>
        string(3) "foo"
        'range' =>
        array(101) {
          [0] =>
          int(0)
          [1] =>
          int(1)
          ...
          [99] =>
          int(99)
          [100] =>
          int(100)
        }
      }
    }
  }
}

Installation

Supposing you are using composer, add to your composer.json:

{
    "require": {
        "eexit/twig-context-parser": "0.1.*"
    }
}

Usage

use Eexit\Twig\ContextParser\ContextParser;

$loader = new \Twig_Loader_String();
$twig = new \Twig_Environment($loader);

$template = $twig->parse($twig->tokenize('{% set foo = "bar" %}{% set baz = "yux" %}'));

$context = new ContextParser($twig);

var_dump($context->parse($template)->getContext());

/*
array(2) {
    'foo' =>
    string(3) "bar"
    'baz' =>
    string(3) "yux"
}
*/

The ContextParser::getParser() will return the node context once. Once you called the method, calling it again will return nothing. This allows to use the same ContextParser instance to parse several template in a row.