<?php

require_once 'PintCompiler/Generator/Function.php';
/**
 * Stack manager for classes / and functions
 *
 *
 * 
 */
 
$GLOBALS['_PintCompiler_Generator'] = array(
    'functions' => array(),
    'active'    => 0,
    'activeClass' => null,
    'classes' => array(),
);
 
class PintCompiler_Generator
{
     
    
    /**
    * add a function to the stack
    *
    * @param   object  PintCompiler_Generator_function 
    *
    * @return   int         id in stack
    * @access   public
    */
  
    function addFunction($func) {
        // we copy (not reference here)
        
        $id = count($GLOBALS['_PintCompiler_Generator']['functions']);
        $func->id = $id;
        $GLOBALS['_PintCompiler_Generator']['functions'][$id] = $func;
        return $id;
    }
    
    /**
    * retreive a function from the stack..
    *
    * @param   int    id in stack
    *
    * @return  object  PintCompiler_Generator_function 
    * @access   public
    */
     
    function &getFunction($id=false) {
       
        if ($id === false) {
            return $GLOBALS['_PintCompiler_Generator']['functions'][
               $GLOBALS['_PintCompiler_Generator']['active']  
            ];
        }
        return $GLOBALS['_PintCompiler_Generator']['functions'][$id];
    }
    /**
    * retreive a function from using the name
    *
    * @param   string name of function.
    *
    * @return   PintCompiler_Generator_function | false  
    * @access   public
    */
     
    function &getFunctionByName($name) {
        foreach(array_keys($GLOBALS['_PintCompiler_Generator']['functions']) as $i) {
            if ($GLOBALS['_PintCompiler_Generator']['functions'][$i]->name == $name) {
                return $GLOBALS['_PintCompiler_Generator']['functions'][$i];
            }
        }
        $f = false;
        return $f;
    
    }
    /**
    * set the active Function
    *
    * @param   int    id in stack
    *
    
    * @access   public
    */
     
    function  setActiveFunction($id=0) {
       
        $GLOBALS['_PintCompiler_Generator']['active'] = $id;
    }
     /**
    * set the active class
    *
    * @param   object
    * @return int id of the class in the stack.
    * @access   public
    */
     
    function  addClass($class) 
    {
        $id = count($GLOBALS['_PintCompiler_Generator']['classes']);
        $class->id = $id;
        $GLOBALS['_PintCompiler_Generator']['classes'][$id] = $class;
        $GLOBALS['_PintCompiler_Generator']['activeClass'] = $id;
        return $id;
    }
    
    function  &getActiveClass() 
    {
        $id = $GLOBALS['_PintCompiler_Generator']['activeClass'];
        return $GLOBALS['_PintCompiler_Generator']['classes'][$id];
    }
    
    
      /**
    * retreive number of functions on stack
    *
    *
    * @return  int   number in stack..
    * @access   public
    */
     
    function countFunctions() {
        return count($GLOBALS['_PintCompiler_Generator']['functions']);
    }
    
    
    function nodeFactory($name, $args=array()) {
        //echo "NODE::$name ".serialize($args)."\n";
        $class = 'PintCompiler_Node_' . $name;
        if (strtolower($name) == 'function' ) { 
            $class = 'PintCompiler_Generator_Function';
        }
        if (!class_exists($class)) {
            require_once implode('/',explode('_',$class)).'.php';
            
        }
        if (!class_exists($class)) {
            trigger_error("Unable to create Class $class",E_USER_ERROR);
        }
        $r = new $class();
        $vars = array_keys(get_class_vars($class));
        foreach($args as $k => $v) {
            if (!in_array($k,$vars)) {
                trigger_error("Variable $class::$k does not exist",E_USER_ERROR);
            }
            $r->$k = $v;
        }
        return $r;
    
    }
    
}