<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think\template\driver;

use think\Exception;

class File
{
    // 写入编译缓存
    public function write($cacheFile, $content)
    {
        // 检测模板目录
        $dir = dirname($cacheFile);
        if (!is_dir($dir)) {
            mkdir($dir, 0777, true);
        }
        // 生成模板缓存文件
        if (false === file_put_contents($cacheFile, $content)) {
            throw new Exception('cache write error :' . $cacheFile, 11602);
        }
    }

    // 读取编译编译
    public function read($cacheFile, $vars)
    {
        // 模板阵列变量分解成为独立变量
        extract($vars, EXTR_OVERWRITE);
        //载入模版缓存文件
        include $cacheFile;
    }

    // 检查编译缓存是否有效
    public function check($template, $cacheFile, $cacheTime)
    {
        if (!is_file($cacheFile) || (is_file($template) && filemtime($template) > filemtime($cacheFile))) {
            // 模板文件如果有更新则缓存需要更新
            return false;
        } elseif (0 != $cacheTime && time() > filemtime($cacheFile) + $cacheTime) {
            // 缓存是否在有效期
            return false;
        }
        return true;
    }
}