c85a43561e
Reformat existing documentation to match the format Change-Id: I190b54b5e962f17bab6502dd1b3c02f11dc926d2
120 lines
2.9 KiB
PHP
120 lines
2.9 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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/**
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* An iterator which works exactly like:
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*
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* foreach ( explode( $delim, $s ) as $element ) {
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* ...
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* }
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*
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* Except it doesn't use 193 byte per element
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*/
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class ExplodeIterator implements Iterator {
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/** @var string The subject string */
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private $subject;
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/** @var int The subject string length */
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private $subjectLength;
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/** @var string The delimiter */
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private $delim;
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/** @var int The delimiter string length */
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private $delimLength;
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/** @var int The position of the start of the line */
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private $curPos;
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/** @var int The position after the end of the next delimiter */
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private $endPos;
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/** @var string|false The current token */
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private $current;
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/**
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* Construct a DelimIterator
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* @param string $delim
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* @param string $subject
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*/
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public function __construct( $delim, $subject ) {
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$this->subject = $subject;
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$this->delim = $delim;
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// Micro-optimisation (theoretical)
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$this->subjectLength = strlen( $subject );
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$this->delimLength = strlen( $delim );
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$this->rewind();
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}
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public function rewind() {
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$this->curPos = 0;
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$this->endPos = strpos( $this->subject, $this->delim );
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$this->refreshCurrent();
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}
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public function refreshCurrent() {
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if ( $this->curPos === false ) {
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$this->current = false;
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} elseif ( $this->curPos >= $this->subjectLength ) {
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$this->current = '';
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} elseif ( $this->endPos === false ) {
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$this->current = substr( $this->subject, $this->curPos );
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} else {
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$this->current = substr( $this->subject, $this->curPos, $this->endPos - $this->curPos );
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}
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}
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public function current() {
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return $this->current;
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}
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/**
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* @return int|bool Current position or boolean false if invalid
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*/
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public function key() {
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return $this->curPos;
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}
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/**
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* @return void
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*/
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public function next() {
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if ( $this->endPos === false ) {
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$this->curPos = false;
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} else {
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$this->curPos = $this->endPos + $this->delimLength;
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if ( $this->curPos >= $this->subjectLength ) {
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$this->endPos = false;
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} else {
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$this->endPos = strpos( $this->subject, $this->delim, $this->curPos );
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}
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}
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$this->refreshCurrent();
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}
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/**
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* @return bool
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*/
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public function valid() {
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return $this->curPos !== false;
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}
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}
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