<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace Behavior;

/**
 * 系统行为扩展：模板内容输出替换
 */
class ContentReplaceBehavior
{

    // 行为扩展的执行入口必须是run
    public function run(&$content)
    {
        $content = $this->templateContentReplace($content);
    }

    /**
     * 模板内容替换
     * @access protected
     * @param string $content 模板内容
     * @return string
     */
    protected function templateContentReplace($content)
    {
        // 系统默认的特殊变量替换
        $replace = array(
            '__ROOT__'       => __ROOT__, // 当前网站地址
            '__APP__'        => __APP__, // 当前应用地址
            '__MODULE__'     => __MODULE__,
            '__ACTION__'     => __ACTION__, // 当前操作地址
            '__SELF__'       => htmlentities(__SELF__), // 当前页面地址
            '__CONTROLLER__' => __CONTROLLER__,
            '__URL__'        => __CONTROLLER__,
            '__PUBLIC__'     => __ROOT__ . '/Public', // 站点公共目录
        );
        // 允许用户自定义模板的字符串替换
        if (is_array(C('TMPL_PARSE_STRING'))) {
            $replace = array_merge($replace, C('TMPL_PARSE_STRING'));
        }

        $content = str_replace(array_keys($replace), array_values($replace), $content);
        return $content;
    }

}
