<?php
/*
	Class name: Themes
	Class autor: Victor De la Rocha http//mis-algoritmos.com/themes-class
	Email: vyk2rr [at] gmail [dot] com
*/
class themes{
	var $registry;
	var $path;
	var $l10n;

	var $output;
	var $vars=array(); //variable para apilar las variables que se asignan a la plantilla

	function themes(){
		#$this->l10n = l10n::getInstance();
	}

	function set($name, $value){
		$this->vars[$name] = $value;
		return true;
	}

	function remove($name) {
		unset($this->vars[$name]);
		return true;
	}

	//obtiene el contenido del tema ya con todos los valores sutituidos en las variables.
	function fetch($file){
		$this->exec($file);
		return $this->output;
	}

	//muestra el contenido del tema ya con todos los valroes sustituidos en las variables.
	function display($file){
		$this->exec($file);
		echo $this->output;
	}

	//corre el proceso de sustitucion de valores en las variables del theme y retorna todo en la variable $this->output para ser devuelto por: fetch o display
	function exec($file){
		$this->file = $file;
		$output = file_get_contents($file);
		$this->output = $output;
		$this->registrar_vars();
		$this->__();
		$this->eval_control_structures();

		//evaluate All as PHP code
		ob_start();eval($this->output);
		$this->output = ob_get_clean();
	}

	function eval_control_structures(){
		//finding IFs sentences and converting to php code
		$this->output = "echo \"".addslashes($this->output)."\";";
		$this->output = preg_replace_callback("/{if ([^}]+)}/",create_function('$arr','return "\";if(".stripslashes($arr[1])."){echo\"";'),$this->output);
		$this->output = preg_replace("/{else}/","\";}else{echo\"",$this->output);
		$this->output = preg_replace_callback("/{elseif ([^}]+)}/",create_function('$arr','return "\";}elseif(".stripslashes($arr[1])."){echo\"";'),$this->output);
		$this->output = preg_replace("/{\/if}/","\";} echo \"",$this->output);

		//finding FOREACHs or BLOCKs sentences and converting to php code
		$this->output = preg_replace_callback("/{block ([^}]+) as ([^}]+)=>[\$]([^}]+)}/",create_function('$arr','return "\";foreach(".stripslashes($arr[1])." as ".stripslashes($arr[2])."=>\$this->vars[\'".stripslashes($arr[3])."\']){echo\"";'),$this->output);
		$this->output = preg_replace_callback("/{block ([^}]+) as ([^}]+)}/",create_function('$arr','return "\";foreach(".stripslashes($arr[1])." as ".stripslashes($arr[2])."){echo\"";'),$this->output);
		$this->output = preg_replace("/{\/block}/","\";} echo \"",$this->output);

		//Converting the $this->vars[\'variable\'] format to {$this->vars['variable']}
		$this->output = preg_replace("/[\$]this->vars\[\\\'([^ \.\\\]+)\\\'\]\[\\\'([^ \.\\\]+)\\\'\]/","{\$this->vars['$1']['$2']}",$this->output);
		$this->output = preg_replace("/[\$]this->vars\[\\\'([^ \.\\\]+)\\\'\]/","{\$this->vars['$1']}",$this->output);

		//Converting the {__(\'word\')} format to {__('word')}
		#$this->output = preg_replace("/[\$]this->vars\[\\\'([^ \.\\\]+)\\\'\]/","{\$this->vars['$1']}",$this->output);
	}

	//sustituye las variables en el output del template
	function registrar_vars(){
		foreach($this->vars as $k=>$v){
			//pre($this->vars);
			if(is_array($v)){
				//Si es un arreglo, se intenta procesar un nivel mas adentro para sustituir en el theme por lo que tenga: nombredearreglo.dato
				foreach($v as $_k=>$_v)
					if(!is_array($_v))
						$this->output = str_replace('{'.$k.'.'.$_k.'}',$_v,$this->output);
			}else{
				// sustituimos directamente las variables {$variable}
				$this->output = str_replace('{'.$k.'}',$v,$this->output);
			}
		}

		//replacing {$key} format by $this->vars['key']
		//replacing  {$array.key} format by $this->vars['array']['key']
		$patrones = array(
			'/{\$([^ \.}]+)}/s',
			'/{\$([^ \.}]+)\.([^ \.}]+)}/s'
		);
		$reemplazos = array(
			"\$this->vars['$1']",
			"\$this->vars['$1']['$2']"
		);
		$this->output = preg_replace($patrones, $reemplazos, $this->output);
	}

	//Utiliza gettext
	function __(){
		$patron = "/{__\((?:'|\")([^\)]+?)(?:'|\")\)}/s";
		preg_match_all($patron,$this->output,$out);

		foreach($out[1] as $k=>$v){
				$this->output = str_replace("{__('$v')}",$this->l10n->__($v),$this->output);
			}
	}
}
?>