<?php

/**

 * Smarty Internal Plugin Compile Assign

 * Compiles the {assign} tag

 *

 * @package    Smarty

 * @subpackage Compiler

 * @author     Uwe Tews

 */

/**

 * Smarty Internal Plugin Compile Assign Class

 *

 * @package    Smarty

 * @subpackage Compiler

 */

class Smarty_Internal_Compile_Assign extends Smarty_Internal_CompileBase {

    /**

     * Compiles code for the {assign} tag

     *

     * @param  array $args array with attributes from parser

     * @param  object $compiler compiler object

     * @param  array $parameter array with compilation parameter

     *

     * @return string compiled code

     */

    public function compile($args, $compiler, $parameter) {

        // the following must be assigned at runtime because it will be overwritten in Smarty_Internal_Compile_Append

        $this->required_attributes = array('var', 'value');

        $this->shorttag_order = array('var', 'value');

        $this->optional_attributes = array('scope');

        $_nocache = 'null';

        $_scope = Smarty::SCOPE_LOCAL;

        // check and get attributes

        $_attr = $this->getAttributes($compiler, $args);

        // nocache ?

        if ($compiler->tag_nocache || $compiler->nocache) {

            $_nocache = 'true';

            // create nocache var to make it know for further compiling

            if (isset($compiler->template->tpl_vars[trim($_attr['var'], "'")])) {

                $compiler->template->tpl_vars[trim($_attr['var'], "'")]->nocache = true;

            } else {

                $compiler->template->tpl_vars[trim($_attr['var'], "'")] = new Smarty_Variable(null, true);

            }

        }

        // scope setup

        if (isset($_attr['scope'])) {

            $_attr['scope'] = trim($_attr['scope'], "'\"");

            if ($_attr['scope'] == 'parent') {

                $_scope = Smarty::SCOPE_PARENT;

            } elseif ($_attr['scope'] == 'root') {

                $_scope = Smarty::SCOPE_ROOT;

            } elseif ($_attr['scope'] == 'global') {

                $_scope = Smarty::SCOPE_GLOBAL;

            } else {

                $compiler->trigger_template_error('illegal value for "scope" attribute', $compiler->lex->taglineno);

            }

        }

        // compiled output

        if (isset($parameter['smarty_internal_index'])) {

            $output = "<?php \$_smarty_tpl->createLocalArrayVariable($_attr[var], $_nocache, $_scope);\n\$_smarty_tpl->tpl_vars[$_attr[var]]->value$parameter[smarty_internal_index] = $_attr[value];";

        } else {

            // implement Smarty2's behaviour of variables assigned by reference

            if ($compiler->template->smarty instanceof SmartyBC) {

                $output = "<?php if (isset(\$_smarty_tpl->tpl_vars[$_attr[var]])) {\$_smarty_tpl->tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]];";

                $output .= "\n\$_smarty_tpl->tpl_vars[$_attr[var]]->value = $_attr[value]; \$_smarty_tpl->tpl_vars[$_attr[var]]->nocache = $_nocache; \$_smarty_tpl->tpl_vars[$_attr[var]]->scope = $_scope;";

                $output .= "\n} else \$_smarty_tpl->tpl_vars[$_attr[var]] = new Smarty_Variable($_attr[value], $_nocache, $_scope);";

            } else {

                $output = "<?php \$_smarty_tpl->tpl_vars[$_attr[var]] = new Smarty_Variable($_attr[value], $_nocache, $_scope);";

            }

        }

        if ($_scope == Smarty::SCOPE_PARENT) {

            $output .= "\nif (\$_smarty_tpl->parent != null) \$_smarty_tpl->parent->tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]];";

        } elseif ($_scope == Smarty::SCOPE_ROOT || $_scope == Smarty::SCOPE_GLOBAL) {

            $output .= "\n\$_ptr = \$_smarty_tpl->parent; while (\$_ptr != null) {\$_ptr->tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]]; \$_ptr = \$_ptr->parent; }";

        }

        if ($_scope == Smarty::SCOPE_GLOBAL) {

            $output .= "\nSmarty::\$global_tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]];";

        }

        $output .= '?>';

        return $output;

    }

}