vendor/topthink/framework/src/think/responseView.php

<?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\response;

use think\Cookie;
use think\Response;
use think\View as BaseView;

/**
 * View Response
 */
class View extends Response
{
    /**
     * 输出参数
     * @var array
     */
    protected $options = [];

    /**
     * 输出变量
     * @var array
     */
    protected $vars = [];

    /**
     * 输出过滤
     * @var mixed
     */
    protected $filter;

    /**
     * 输出type
     * @var string
     */
    protected $contentType = 'text/html';

    /**
     * View对象
     * @var BaseView
     */
    protected $view;

    /**
     * 是否内容渲染
     * @var bool
     */
    protected $isContent = false;

    public function __construct(Cookie $cookie, BaseView $view, $data = '', int $code = 200)
    {
        $this->init($data, $code);

        $this->cookie = $cookie;
        $this->view   = $view;
    }

    /**
     * 设置是否为内容渲染
     * @access public
     * @param  bool $content
     * @return $this
     */
    public function isContent(bool $content = true)
    {
        $this->isContent = $content;
        return $this;
    }

    /**
     * 处理数据
     * @access protected
     * @param  mixed $data 要处理的数据
     * @return string
     */
    protected function output($data): string
    {
        // 渲染模板输出
        return $this->view->filter($this->filter)
            ->fetch($data, $this->vars, $this->isContent);
    }

    /**
     * 获取视图变量
     * @access public
     * @param  string $name 模板变量
     * @return mixed
     */
    public function getVars(string $name = null)
    {
        if (is_null($name)) {
            return $this->vars;
        } else {
            return $this->vars[$name] ?? null;
        }
    }

    /**
     * 模板变量赋值
     * @access public
     * @param  string|array $name  模板变量
     * @param  mixed        $value 变量值
     * @return $this
     */
    public function assign($name, $value = null)
    {
        if (is_array($name)) {
            $this->vars = array_merge($this->vars, $name);
        } else {
            $this->vars[$name] = $value;
        }

        return $this;
    }

    /**
     * 视图内容过滤
     * @access public
     * @param callable $filter
     * @return $this
     */
    public function filter(callable $filter = null)
    {
        $this->filter = $filter;
        return $this;
    }

    /**
     * 检查模板是否存在
     * @access public
     * @param  string  $name 模板名
     * @return bool
     */
    public function exists(string $name): bool
    {
        return $this->view->exists($name);
    }

}