--- /dev/null
+<?php
+/**
+ * @file
+ * @ingroup Testing
+ */
+
+class ParserTestResultNormalizer {
+ protected $doc, $xpath, $invalid;
+
+ public static function normalize( $text, $funcs ) {
+ $norm = new self( $text );
+ if ( $norm->invalid ) {
+ return $text;
+ }
+ foreach ( $funcs as $func ) {
+ $norm->$func();
+ }
+ return $norm->serialize();
+ }
+
+ protected function __construct( $text ) {
+ $this->doc = new DOMDocument( '1.0', 'utf-8' );
+
+ // Note: parsing a supposedly XHTML document with an XML parser is not
+ // guaranteed to give accurate results. For example, it may introduce
+ // differences in the number of line breaks in <pre> tags.
+
+ MediaWiki\suppressWarnings();
+ if ( !$this->doc->loadXML( '<html><body>' . $text . '</body></html>' ) ) {
+ $this->invalid = true;
+ }
+ MediaWiki\restoreWarnings();
+ $this->xpath = new DOMXPath( $this->doc );
+ $this->body = $this->xpath->query( '//body' )->item( 0 );
+ }
+
+ protected function removeTbody() {
+ foreach ( $this->xpath->query( '//tbody' ) as $tbody ) {
+ while ( $tbody->firstChild ) {
+ $child = $tbody->firstChild;
+ $tbody->removeChild( $child );
+ $tbody->parentNode->insertBefore( $child, $tbody );
+ }
+ $tbody->parentNode->removeChild( $tbody );
+ }
+ }
+
+ /**
+ * The point of this function is to produce a normalized DOM in which
+ * Tidy's output matches the output of html5depurate. Tidy both trims
+ * and pretty-prints, so this requires fairly aggressive treatment.
+ *
+ * In particular, note that Tidy converts <pre>x</pre> to <pre>\nx\n</pre>,
+ * which theoretically affects display since the second line break is not
+ * ignored by compliant HTML parsers.
+ *
+ * This function also removes empty elements, as does Tidy.
+ */
+ protected function trimWhitespace() {
+ foreach ( $this->xpath->query( '//text()' ) as $child ) {
+ if ( strtolower( $child->parentNode->nodeName ) === 'pre' ) {
+ // Just trim one line break from the start and end
+ if ( substr_compare( $child->data, "\n", 0 ) === 0 ) {
+ $child->data = substr( $child->data, 1 );
+ }
+ if ( substr_compare( $child->data, "\n", -1 ) === 0 ) {
+ $child->data = substr( $child->data, 0, -1 );
+ }
+ } else {
+ // Trim all whitespace
+ $child->data = trim( $child->data );
+ }
+ if ( $child->data === '' ) {
+ $child->parentNode->removeChild( $child );
+ }
+ }
+ }
+
+ /**
+ * Serialize the XML DOM for comparison purposes. This does not generate HTML.
+ * @return string
+ */
+ protected function serialize() {
+ return strtr( $this->doc->saveXML( $this->body ),
+ [ '<body>' => '', '</body>' => '' ] );
+ }
+}
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