1 files changed, 143 insertions, 0 deletions
diff --git a/includes/parser/ParserDiffTest.php b/includes/parser/ParserDiffTest.php
new file mode 100644
index 00000000..174c1d61
--- /dev/null
+++ b/includes/parser/ParserDiffTest.php
@@ -0,0 +1,143 @@
+<?php
+/**
+ * Fake parser that output the difference of two different parsers
+ *
+ * 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
+ * @ingroup Parser
+ */
+
+/**
+ * @ingroup Parser
+ */
+class ParserDiffTest
+{
+	public $parsers;
+	public $conf;
+	public $shortOutput = false;
+	public $dtUniqPrefix;
+
+	public function __construct( $conf ) {
+		if ( !isset( $conf['parsers'] ) ) {
+			throw new MWException( __METHOD__ . ': no parsers specified' );
+		}
+		$this->conf = $conf;
+	}
+
+	public function init() {
+		if ( !is_null( $this->parsers ) ) {
+			return;
+		}
+
+		global $wgHooks;
+		static $doneHook = false;
+		if ( !$doneHook ) {
+			$doneHook = true;
+			$wgHooks['ParserClearState'][] = array( $this, 'onClearState' );
+		}
+		if ( isset( $this->conf['shortOutput'] ) ) {
+			$this->shortOutput = $this->conf['shortOutput'];
+		}
+
+		foreach ( $this->conf['parsers'] as $i => $parserConf ) {
+			if ( !is_array( $parserConf ) ) {
+				$class = $parserConf;
+				$parserConf = array( 'class' => $parserConf );
+			} else {
+				$class = $parserConf['class'];
+			}
+			$this->parsers[$i] = new $class( $parserConf );
+		}
+	}
+
+	public function __call( $name, $args ) {
+		$this->init();
+		$results = array();
+		$mismatch = false;
+		$lastResult = null;
+		$first = true;
+		foreach ( $this->parsers as $i => $parser ) {
+			$currentResult = call_user_func_array( array( &$this->parsers[$i], $name ), $args );
+			if ( $first ) {
+				$first = false;
+			} else {
+				if ( is_object( $lastResult ) ) {
+					if ( $lastResult != $currentResult ) {
+						$mismatch = true;
+					}
+				} else {
+					if ( $lastResult !== $currentResult ) {
+						$mismatch = true;
+					}
+				}
+			}
+			$results[$i] = $currentResult;
+			$lastResult = $currentResult;
+		}
+		if ( $mismatch ) {
+			if ( count( $results ) == 2 ) {
+				$resultsList = array();
+				foreach ( $this->parsers as $i => $parser ) {
+					$resultsList[] = var_export( $results[$i], true );
+				}
+				$diff = wfDiff( $resultsList[0], $resultsList[1] );
+			} else {
+				$diff = '[too many parsers]';
+			}
+			$msg = "ParserDiffTest: results mismatch on call to $name\n";
+			if ( !$this->shortOutput ) {
+				$msg .= 'Arguments: ' . $this->formatArray( $args ) . "\n";
+			}
+			$msg .= 'Results: ' . $this->formatArray( $results ) . "\n" .
+				"Diff: $diff\n";
+			throw new MWException( $msg );
+		}
+		return $lastResult;
+	}
+
+	public function formatArray( $array ) {
+		if ( $this->shortOutput ) {
+			foreach ( $array as $key => $value ) {
+				if ( $value instanceof ParserOutput ) {
+					$array[$key] = "ParserOutput: {$value->getText()}";
+				}
+			}
+		}
+		return var_export( $array, true );
+	}
+
+	public function setFunctionHook( $id, $callback, $flags = 0 ) {
+		$this->init();
+		foreach ( $this->parsers as $parser ) {
+			$parser->setFunctionHook( $id, $callback, $flags );
+		}
+	}
+
+	/**
+	 * @param Parser $parser
+	 * @return bool
+	 */
+	public function onClearState( &$parser ) {
+		// hack marker prefixes to get identical output
+		if ( !isset( $this->dtUniqPrefix ) ) {
+			$this->dtUniqPrefix = $parser->uniqPrefix();
+		} else {
+			$parser->mUniqPrefix = $this->dtUniqPrefix;
+		}
+		return true;
+	}
+}