vendor/topthink/think-view/src/Think.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace think\view\driver;

use think\App;
use think\helper\Str;
use think\Template;
use think\template\exception\TemplateNotFoundException;

class Think
{
    // 模板引擎实例
    private $template;
    private $app;

    // 模板引擎参数
    protected $config = [
        // 默认模板渲染规则 1 解析为小写+下划线 2 全部转换小写 3 保持操作方法
        'auto_rule'     => 1,
        // 视图目录名
        'view_dir_name' => 'view',
        // 模板起始路径
        'view_path'     => '',
        // 模板文件后缀
        'view_suffix'   => 'html',
        // 模板文件名分隔符
        'view_depr'     => DIRECTORY_SEPARATOR,
        // 是否开启模板编译缓存,设为false则每次都会重新编译
        'tpl_cache'     => true,
    ];

    public function __construct(App $app, array $config = [])
    {
        $this->app = $app;

        $this->config = array_merge($this->config, (array) $config);

        if (empty($this->config['cache_path'])) {
            $this->config['cache_path'] = $app->getRuntimePath() . 'temp' . DIRECTORY_SEPARATOR;
        }

        $this->template = new Template($this->config);
        $this->template->setCache($app->cache);
        $this->template->extend('$Think', function (array $vars) {
            $type  = strtoupper(trim(array_shift($vars)));
            $param = implode('.', $vars);

            switch ($type) {
                case 'CONST':
                    $parseStr = strtoupper($param);