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authorPierre Schmitz <pierre@archlinux.de>2015-06-04 07:31:04 +0200
committerPierre Schmitz <pierre@archlinux.de>2015-06-04 07:58:39 +0200
commitf6d65e533c62f6deb21342d4901ece24497b433e (patch)
treef28adf0362d14bcd448f7b65a7aaf38650f923aa /includes/libs/ExplodeIterator.php
parentc27b2e832fe25651ef2410fae85b41072aae7519 (diff)
Update to MediaWiki 1.25.1
Diffstat (limited to 'includes/libs/ExplodeIterator.php')
-rw-r--r--includes/libs/ExplodeIterator.php116
1 files changed, 116 insertions, 0 deletions
diff --git a/includes/libs/ExplodeIterator.php b/includes/libs/ExplodeIterator.php
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+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * An iterator which works exactly like:
+ *
+ * foreach ( explode( $delim, $s ) as $element ) {
+ * ...
+ * }
+ *
+ * Except it doesn't use 193 byte per element
+ */
+class ExplodeIterator implements Iterator {
+ // The subject string
+ private $subject, $subjectLength;
+
+ // The delimiter
+ private $delim, $delimLength;
+
+ // The position of the start of the line
+ private $curPos;
+
+ // The position after the end of the next delimiter
+ private $endPos;
+
+ // The current token
+ private $current;
+
+ /**
+ * Construct a DelimIterator
+ * @param string $delim
+ * @param string $subject
+ */
+ public function __construct( $delim, $subject ) {
+ $this->subject = $subject;
+ $this->delim = $delim;
+
+ // Micro-optimisation (theoretical)
+ $this->subjectLength = strlen( $subject );
+ $this->delimLength = strlen( $delim );
+
+ $this->rewind();
+ }
+
+ public function rewind() {
+ $this->curPos = 0;
+ $this->endPos = strpos( $this->subject, $this->delim );
+ $this->refreshCurrent();
+ }
+
+ public function refreshCurrent() {
+ if ( $this->curPos === false ) {
+ $this->current = false;
+ } elseif ( $this->curPos >= $this->subjectLength ) {
+ $this->current = '';
+ } elseif ( $this->endPos === false ) {
+ $this->current = substr( $this->subject, $this->curPos );
+ } else {
+ $this->current = substr( $this->subject, $this->curPos, $this->endPos - $this->curPos );
+ }
+ }
+
+ public function current() {
+ return $this->current;
+ }
+
+ /**
+ * @return int|bool Current position or boolean false if invalid
+ */
+ public function key() {
+ return $this->curPos;
+ }
+
+ /**
+ * @return string
+ */
+ public function next() {
+ if ( $this->endPos === false ) {
+ $this->curPos = false;
+ } else {
+ $this->curPos = $this->endPos + $this->delimLength;
+ if ( $this->curPos >= $this->subjectLength ) {
+ $this->endPos = false;
+ } else {
+ $this->endPos = strpos( $this->subject, $this->delim, $this->curPos );
+ }
+ }
+ $this->refreshCurrent();
+
+ return $this->current;
+ }
+
+ /**
+ * @return bool
+ */
+ public function valid() {
+ return $this->curPos !== false;
+ }
+}