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<?php declare( strict_types = 1 ); namespace Wikimedia\Parsoid\Language; use Wikimedia\Assert\Assert; use Wikimedia\LangConv\ReplacementMachine; use Wikimedia\Parsoid\Config\Env; use Wikimedia\Parsoid\DOM\DocumentFragment; use Wikimedia\Parsoid\DOM\Element; use Wikimedia\Parsoid\DOM\Node; use Wikimedia\Parsoid\DOM\Text; use Wikimedia\Parsoid\Utils\DOMCompat; use Wikimedia\Parsoid\Utils\DOMDataUtils; use Wikimedia\Parsoid\Utils\DOMTraverser; use Wikimedia\Parsoid\Utils\DOMUtils; use Wikimedia\Parsoid\Utils\Utils; class ConversionTraverser extends DOMTraverser { /** @var string / private $toLang; /* @var string / private $fromLang; /* @var LanguageGuesser / private $guesser; /* @var ReplacementMachine / private $machine; /* * @param string $toLang target language for conversion * @param LanguageGuesser $guesser oracle to determine "original language" for round-tripping * @param ReplacementMachine $machine machine to do actual conversion / public function __construct( string $toLang, LanguageGuesser $guesser, ReplacementMachine $machine ) { parent::__construct(); $this->toLang = $toLang; $this->guesser = $guesser; $this->machine = $machine; // No conversion inside <code>, <script>, <pre>, <cite> // (See adhoc regexps inside LanguageConverter.php::autoConvert) // XXX: <cite> ought to probably be handled more generically // as extension output, not special-cased as a HTML tag. foreach ( [ 'code', 'script', 'pre', 'cite' ] as $el ) { $this->addHandler( $el, function ( ...$args ) { return $this->noConvertHandler( ...$args ); } ); } // Setting/saving the language context $this->addHandler( null, function ( ...$args ) { return $this->anyHandler( ...$args ); } ); $this->addHandler( 'p', function ( ...$args ) { return $this->langContextHandler( ...$args ); } ); $this->addHandler( 'body', function ( ...$args ) { return $this->langContextHandler( ...$args ); } ); // Converting #text, <a> nodes, and title/alt attributes $this->addHandler( '#text', function ( ...$args ) { return $this->textHandler( ...$args ); } ); $this->addHandler( 'a', function ( ...$args ) { return $this->aHandler( ...$args ); } ); $this->addHandler( null, function ( ...$args ) { return $this->attrHandler( ...$args ); } ); // LanguageConverter markup foreach ( [ 'meta', 'div', 'span' ] as $el ) { $this->addHandler( $el, function ( ...$args ) { return $this->lcHandler( ...$args ); } ); } } /* * @param Element $el * @param Env $env * @return ?Node\|bool / private function noConvertHandler( Element $el, Env $env ) { // Don't touch the inside of this node! return $el->nextSibling; } /* * @param Node $node * @param Env $env * @return ?Node\|bool / private function anyHandler( Node $node, Env $env ) { / Look for `lang` attributes / if ( $node instanceof Element ) { if ( $node->hasAttribute( 'lang' ) ) { $lang = $node->getAttribute( 'lang' ) ?? ''; // XXX validate lang! override fromLang? // $this->>fromLang = $lang; } } return true; // Continue with other handlers } /* * @param Element $el * @param Env $env * @return ?Node\|bool / private function langContextHandler( Element $el, Env $env ) { $this->fromLang = $this->guesser->guessLang( $el ); $el->setAttribute( 'data-mw-variant-lang', $this->fromLang ); return true; // Continue with other handlers } /* * @param Node $node * @param Env $env * @return ?Node\|bool / private function textHandler( Node $node, Env $env ) { Assert::invariant( $this->fromLang !== null, 'Text w/o a context' ); // @phan-suppress-next-line PhanTypeMismatchArgument,PhanTypeMismatchReturn both declared as DOMNode return $this->machine->replace( $node, $this->toLang, $this->fromLang ); } /* * @param Element $el * @param Env $env * @return ?Node\|bool / private function aHandler( Element $el, Env $env ) { // Is this a wikilink? If so, extract title & convert it if ( DOMUtils::hasRel( $el, 'mw:WikiLink' ) ) { $href = preg_replace( '#^(\.\.?/)+#', '', $el->getAttribute( 'href' ) ?? '', 1 ); $fromPage = Utils::decodeURI( $href ); $toPageFrag = $this->machine->convert( $el->ownerDocument, $fromPage, $this->toLang, $this->fromLang ); '@phan-var DocumentFragment $toPageFrag'; // @var DocumentFragment $toPageFrag $toPage = $this->docFragToString( $toPageFrag ); if ( $toPage === null ) { // Non-reversible transform (sigh); mark this for rt. $el->setAttribute( 'data-mw-variant-orig', $fromPage ); $toPage = $this->docFragToString( $toPageFrag, true/ force / ); } if ( $el->hasAttribute( 'title' ) ) { $el->setAttribute( 'title', str_replace( '_', ' ', $toPage ) ); } $el->setAttribute( 'href', "./{$toPage}" ); } elseif ( DOMUtils::hasRel( $el, 'mw:WikiLink/Interwiki' ) ) { // Don't convert title or children of interwiki links return $el->nextSibling; } elseif ( DOMUtils::hasRel( $el, 'mw:ExtLink' ) ) { // WTUtils.usesURLLinkSyntax uses data-parsoid, so don't use it, // but syntactic free links should also have class="external free" if ( DOMCompat::getClassList( $el )->contains( 'free' ) ) { // Don't convert children of syntactic "free links" return $el->nextSibling; } // Other external link text is protected from conversion iff // (a) it doesn't starts/end with -{ ... }- if ( $el->firstChild && DOMUtils::hasTypeOf( $el->firstChild, 'mw:LanguageVariant' ) ) { return true; } // (b) it looks like a URL (protocol-relative links excluded) $linkText = $el->textContent; // XXX: this could be expensive if ( Utils::isProtocolValid( $linkText, $env ) && substr( $linkText, 0, 2 ) !== '//' ) { return $el->nextSibling; } } return true; } /* * @param Node $node * @param Env $env * @return ?Node\|bool / private function attrHandler( Node $node, Env $env ) { // Convert `alt` and `title` attributes on elements // (Called before aHandler, so the `title` might get overwritten there) if ( !( $node instanceof Element ) ) { return true; } DOMUtils::assertElt( $node ); foreach ( [ 'title', 'alt' ] as $attr ) { if ( !$node->hasAttribute( $attr ) ) { continue; } if ( $attr === 'title' && DOMUtils::hasRel( $node, 'mw:WikiLink' ) ) { // We've already converted the title in aHandler above. continue; } $orig = $node->getAttribute( $attr ); if ( str_contains( $orig, '://' ) ) { continue; / Don't convert URLs / } $toFrag = $this->machine->convert( $node->ownerDocument, $orig, $this->toLang, $this->fromLang ); '@phan-var DocumentFragment $toFrag'; // @var DocumentFragment $toFrag $to = $this->docFragToString( $toFrag ); if ( $to === null ) { // Non-reversible transform (sigh); mark for rt. $node->setAttribute( "data-mw-variant-{$attr}", $orig ); $to = $this->docFragToString( $toFrag, true/ force / ); } $node->setAttribute( $attr, $to ); } return true; } /* * Handler for LanguageConverter markup * * @param Element $el * @param Env $env * @return ?Node\|bool / private function lcHandler( Element $el, Env $env ) { if ( !DOMUtils::hasTypeOf( $el, 'mw:LanguageVariant' ) ) { return true; / not language converter markup / } $dmv = DOMDataUtils::getJSONAttribute( $el, 'data-mw-variant', [] ); if ( isset( $dmv->disabled ) ) { DOMCompat::setInnerHTML( $el, $dmv->disabled->t ); // XXX check handling of embedded data-parsoid // XXX check handling of nested constructs return $el->nextSibling; } elseif ( isset( $dmv->twoway ) ) { // FIXME } elseif ( isset( $dmv->oneway ) ) { // FIXME } elseif ( isset( $dmv->name ) ) { // FIXME } elseif ( isset( $dmv->filter ) ) { // FIXME } elseif ( isset( $dmv->describe ) ) { // FIXME } return true; } /* * @param DocumentFragment $docFrag * @param bool $force * @return ?string / private function docFragToString( DocumentFragment $docFrag, bool $force = false ): ?string { if ( !$force ) { for ( $child = $docFrag->firstChild; $child; $child = $child->nextSibling ) { if ( !( $child instanceof Text ) ) { return null; / unsafe */ } } } return $docFrag->textContent; } }

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