smarty/libs/sysplugins/internal.compile_eval.php

<?php

/**
* Smarty Internal Plugin Compile Eval
*
* Compiles the {eval} tag 
* @package Smarty
* @subpackage Compiler
* @author Uwe Tews
*/
/**
* Smarty Internal Plugin Compile Eval Class
*/ 
class Smarty_Internal_Compile_Eval extends Smarty_Internal_CompileBase {
    /**
    * Compiles code for the {eval} tag
    * 
    * @param array $args array with attributes from parser
    * @param object $compiler compiler object
    * @return string compiled code
    */
    public function compile($args, $compiler)
    {
        $this->compiler = $compiler; 
        $this->required_attributes = array('var');
        $this->optional_attributes = array('assign'); 
        // check and get attributes
        $_attr = $this->_get_attributes($args); 
        if (isset($_attr['assign'])) {
              // output will be stored in a smarty variable instead of beind displayed
            $_assign = $_attr['assign'];
        }
  
        // create template object
        $_output = "\$_template = new Smarty_Template ('string:'.".$_attr['var'].", \$_smarty_tpl->smarty, \$_smarty_tpl);"; 
        //was there an assign attribute? 
        if (isset($_assign)) {
            $_output .= "\$_smarty_tpl->assign($_assign,\$_smarty_tpl->smarty->fetch(\$_template));";
        } else {
            $_output .= "echo \$_smarty_tpl->smarty->fetch(\$_template);";
        } 
        return "<?php $_output ?>";
    } 
} 

?>