<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006~2015 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: yunwuxin <448901948@qq.com>
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// +----------------------------------------------------------------------
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namespace think\console\output\formatter;
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class Stack
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{
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/**
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* @var Style[]
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*/
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private $styles;
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/**
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* @var Style
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*/
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private $emptyStyle;
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/**
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* 构造方法
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* @param Style|null $emptyStyle
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*/
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public function __construct(Style $emptyStyle = null)
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{
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$this->emptyStyle = $emptyStyle ?: new Style();
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$this->reset();
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}
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/**
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* 重置堆栈
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*/
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public function reset()
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{
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$this->styles = [];
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}
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/**
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* 推一个样式进入堆栈
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* @param Style $style
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*/
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public function push(Style $style)
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{
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$this->styles[] = $style;
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}
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/**
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* 从堆栈中弹出一个样式
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* @param Style|null $style
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* @return Style
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* @throws \InvalidArgumentException
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*/
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public function pop(Style $style = null)
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{
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if (empty($this->styles)) {
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return $this->emptyStyle;
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}
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if (null === $style) {
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return array_pop($this->styles);
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}
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/**
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* @var int $index
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* @var Style $stackedStyle
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*/
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foreach (array_reverse($this->styles, true) as $index => $stackedStyle) {
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if ($style->apply('') === $stackedStyle->apply('')) {
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$this->styles = array_slice($this->styles, 0, $index);
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return $stackedStyle;
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}
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}
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throw new \InvalidArgumentException('Incorrectly nested style tag found.');
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}
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/**
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* 计算堆栈的当前样式。
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* @return Style
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*/
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public function getCurrent()
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{
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if (empty($this->styles)) {
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return $this->emptyStyle;
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}
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return $this->styles[count($this->styles) - 1];
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}
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/**
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* @param Style $emptyStyle
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* @return Stack
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*/
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public function setEmptyStyle(Style $emptyStyle)
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{
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$this->emptyStyle = $emptyStyle;
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return $this;
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}
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/**
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* @return Style
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*/
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public function getEmptyStyle()
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{
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return $this->emptyStyle;
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}
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}
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