61 lines
1.3 KiB
PHP
61 lines
1.3 KiB
PHP
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<?php
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/**
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* Lexer adapted from Simple Test: http://sourceforge.net/projects/simpletest/
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* For an intro to the Lexer see:
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* https://web.archive.org/web/20120125041816/http://www.phppatterns.com/docs/develop/simple_test_lexer_notes
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*
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* @author Marcus Baker http://www.lastcraft.com
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*/
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namespace dokuwiki\Parsing\Lexer;
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/**
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* States for a stack machine.
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*/
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class StateStack
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{
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protected $stack;
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/**
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* Constructor. Starts in named state.
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* @param string $start Starting state name.
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*/
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public function __construct($start)
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{
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$this->stack = array($start);
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}
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/**
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* Accessor for current state.
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* @return string State.
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*/
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public function getCurrent()
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{
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return $this->stack[count($this->stack) - 1];
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}
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/**
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* Adds a state to the stack and sets it to be the current state.
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*
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* @param string $state New state.
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*/
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public function enter($state)
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{
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array_push($this->stack, $state);
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}
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/**
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* Leaves the current state and reverts
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* to the previous one.
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* @return boolean false if we attempt to drop off the bottom of the list.
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*/
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public function leave()
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{
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if (count($this->stack) == 1) {
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return false;
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}
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array_pop($this->stack);
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return true;
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}
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}
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