105 lines
3.3 KiB
PHP
105 lines
3.3 KiB
PHP
<?php
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/**
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* System - PHP Framework
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*
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* PHP Version 5.6
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*
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* @copyright 2016 Ulf Gebhardt (http://www.webcraft-media.de)
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* @license http://www.opensource.org/licenses/mit-license.php MIT
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* @link https://github.com/webcraftmedia/system
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* @package SYSTEM\PAGE
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*/
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namespace SYSTEM\PAGE;
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/**
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* ParensParser Class provided by System to parse Statestring.
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*/
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class ParensParser
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{
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/** something to keep track of parens nesting */
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protected $stack = null;
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/** current level */
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protected $current = null;
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/** input string to parse */
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protected $string = null;
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/** current character offset in string */
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protected $position = null;
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/** start of text-buffer */
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protected $buffer_start = null;
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/**
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* Parse the given string and split by () brackets and |
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*
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* @param string $string String to be parsed
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* @return array Returns array with split strings.
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*/
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public function parse($string)
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{
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if (!$string) {
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// no string, no data
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return array();
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}
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if ($string[0] == '(') {
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// killer outer parens, as they're unnecessary
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$string = substr($string, 1, -1);
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}
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$this->current = array();
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$this->stack = array();
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$this->string = $string;
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$this->length = strlen($this->string);
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// look at each character
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for ($this->position=0; $this->position < $this->length; $this->position++) {
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switch ($this->string[$this->position]) {
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case '(':
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$this->push();
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// push current scope to the stack an begin a new scope
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array_push($this->stack, $this->current);
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$this->current = array();
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break;
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case ')':
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$this->push();
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// save current scope
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$t = $this->current;
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// get the last scope from stack
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$this->current = array_pop($this->stack);
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// add just saved scope to current scope
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$this->current[count($this->current)-1]['sub'] = $t;
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break;
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case '|':
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// make each word its own token
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$this->push();
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break;
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default:
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// remember the offset to do a string capture later
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// could've also done $buffer .= $string[$position]
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// but that would just be wasting resources…
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if ($this->buffer_start === null) {
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$this->buffer_start = $this->position;
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}
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}
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}
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$this->push();
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return $this->current;
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}
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/**
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* Internal Function to push onto the stack
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*
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* @return null Returns null.
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*/
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protected function push()
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{
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if ($this->buffer_start !== null) {
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// extract string from buffer start to current position
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$buffer = substr($this->string, $this->buffer_start, $this->position - $this->buffer_start);
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// clean buffer
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$this->buffer_start = null;
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// throw token into current scope
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$this->current[] = array('name' => $buffer);
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}
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}
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} |