TemplateModeStack.php
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TemplateModeStack.php
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	<?php

	namespace Wikimedia\RemexHtml\TreeBuilder;

	/**
	* The stack of template insertion modes. We use a storage model optimised for
	* access to the element at the top of the stack, which is stored separately
	* from the rest of the stack.
	*/
	class TemplateModeStack {
	/**
	* The insertion mode at the top of the stack. This is public for
	* performance reasons but should be treated as read-only.
	* @var int\|null
	*/
	public $current;

	/**
	* The remainder of the stack
	*
	* @var array
	*/
	private $nonCurrentModes = [];

	/**
	* Push a mode on to the stack
	* @param int $mode
	*/
	public function push( $mode ) {
	$this->nonCurrentModes[] = $this->current;
	$this->current = $mode;
	}

	/**
	* Pop a mode from the stack
	*/
	public function pop() {
	$this->current = array_pop( $this->nonCurrentModes );
	}

	/**
	* Return true if the stack is empty, false otherwise
	* @return bool
	*/
	public function isEmpty() {
	return $this->current === null;
	}
	}