<?php

namespace SilverStripe\i18n;

use SilverStripe\View\SSTemplateParser;

/**
 * Parser that scans through a template and extracts the parameters to the _t and <%t calls
 */
class i18nTextCollector_Parser extends SSTemplateParser
{

	private static $entities = array();

	private static $currentEntity = array();

	public function __construct($string)
	{
		parent::__construct();
		$this->string = $string;
		$this->pos = 0;
		$this->depth = 0;
		$this->regexps = array();
	}

	public function Translate__construct(&$res)
	{
		self::$currentEntity = array(null, null, null); //start with empty array
	}

	public function Translate_Entity(&$res, $sub)
	{
		self::$currentEntity[0] = $sub['text']; //entity
	}

	public function Translate_Default(&$res, $sub)
	{
		self::$currentEntity[1] = $sub['String']['text']; //value
	}

	public function Translate_Context(&$res, $sub)
	{
		self::$currentEntity[2] = $sub['String']['text']; //comment
	}

	public function Translate__finalise(&$res)
	{
		// set the entity name and the value (default), as well as the context (comment)
		// priority is no longer used, so that is blank
		self::$entities[self::$currentEntity[0]] = array(self::$currentEntity[1], null, self::$currentEntity[2]);
	}

	/**
	 * Parses a template and returns any translatable entities
	 */
	public static function GetTranslatables($template)
	{
		self::$entities = array();

		// Run the parser and throw away the result
		$parser = new i18nTextCollector_Parser($template);
		if (substr($template, 0, 3) == pack("CCC", 0xef, 0xbb, 0xbf)) {
			$parser->pos = 3;
		}
		$parser->match_TopTemplate();

		return self::$entities;
	}
}