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InForeignContent.php
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InForeignContent.php
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<?php
namespace Wikimedia\RemexHtml\TreeBuilder;
use Wikimedia\RemexHtml\HTMLData;
use Wikimedia\RemexHtml\Tokenizer\Attributes;
/**
* The rules for parsing tokens in foreign content.
*
* This is not referred to as an insertion mode in the spec, but is
* sufficiently similar to one that we can inherit from InsertionMode here.
*/
class InForeignContent extends InsertionMode {
/**
* The list of tag names which unconditionally generate a parse error when
* seen in foreign content.
* @var array<string,bool>
*/
private static $notAllowed = [
'b' => true,
'big' => true,
'blockquote' => true,
'body' => true,
'br' => true,
'center' => true,
'code' => true,
'dd' => true,
'div' => true,
'dl' => true,
'dt' => true,
'em' => true,
'embed' => true,
'h1' => true,
'h2' => true,
'h3' => true,
'h4' => true,
'h5' => true,
'h6' => true,
'head' => true,
'hr' => true,
'i' => true,
'img' => true,
'li' => true,
'listing' => true,
'menu' => true,
'meta' => true,
'nobr' => true,
'ol' => true,
'p' => true,
'pre' => true,
'ruby' => true,
's' => true,
'small' => true,
'span' => true,
'strong' => true,
'strike' => true,
'sub' => true,
'sup' => true,
'table' => true,
'tt' => true,
'u' => true,
'ul' => true,
'var' => true,
];
/**
* The table for correcting the tag names of SVG elements, given in the
* "Any other start tag" section of the spec.
* @var array<string,string>
*/
private static $svgElementCase = [
'altglyph' => 'altGlyph',
'altglyphdef' => 'altGlyphDef',
'altglyphitem' => 'altGlyphItem',
'animatecolor' => 'animateColor',
'animatemotion' => 'animateMotion',
'animatetransform' => 'animateTransform',
'clippath' => 'clipPath',
'feblend' => 'feBlend',
'fecolormatrix' => 'feColorMatrix',
'fecomponenttransfer' => 'feComponentTransfer',
'fecomposite' => 'feComposite',
'feconvolvematrix' => 'feConvolveMatrix',
'fediffuselighting' => 'feDiffuseLighting',
'fedisplacementmap' => 'feDisplacementMap',
'fedistantlight' => 'feDistantLight',
'fedropshadow' => 'feDropShadow',
'feflood' => 'feFlood',
'fefunca' => 'feFuncA',
'fefuncb' => 'feFuncB',
'fefuncg' => 'feFuncG',
'fefuncr' => 'feFuncR',
'fegaussianblur' => 'feGaussianBlur',
'feimage' => 'feImage',
'femerge' => 'feMerge',
'femergenode' => 'feMergeNode',
'femorphology' => 'feMorphology',
'feoffset' => 'feOffset',
'fepointlight' => 'fePointLight',
'fespecularlighting' => 'feSpecularLighting',
'fespotlight' => 'feSpotLight',
'fetile' => 'feTile',
'feturbulence' => 'feTurbulence',
'foreignobject' => 'foreignObject',
'glyphref' => 'glyphRef',
'lineargradient' => 'linearGradient',
'radialgradient' => 'radialGradient',
'textpath' => 'textPath',
];
public function characters( $text, $start, $length, $sourceStart, $sourceLength ) {
$builder = $this->builder;
while ( $length ) {
$normalLength = strcspn( $text, "\0\t\n\f\r ", $start, $length );
if ( $normalLength ) {
$builder->framesetOK = false;
$builder->insertCharacters( $text, $start, $normalLength,
$sourceStart, $sourceLength );
}
$start += $normalLength;
$length -= $normalLength;
$sourceStart += $normalLength;
$sourceLength -= $normalLength;
if ( !$length ) {
break;
}
$char = $text[$start];
if ( $char === "\0" ) {
$builder->error( "replaced null character", $sourceStart );
$builder->insertCharacters( "\xef\xbf\xbd", 0, 3, $sourceStart, $sourceLength );
$start++;
$length--;
$sourceStart++;
$sourceLength--;
} else {
// Whitespace
$wsLength = strspn( $text, "\t\n\f\r ", $start, $length );
$builder->insertCharacters( $text, $start, $wsLength, $sourceStart, $wsLength );
$start += $wsLength;
$length -= $wsLength;
$sourceStart += $wsLength;
$sourceLength -= $wsLength;
}
}
}
private function isIntegrationPoint( Element $element ) {
return $element->namespace === HTMLData::NS_HTML
|| $element->isMathmlTextIntegration()
|| $element->isHtmlIntegration();
}
public function startTag( $name, Attributes $attrs, $selfClose, $sourceStart, $sourceLength ) {
$builder = $this->builder;
$stack = $builder->stack;
$dispatcher = $this->dispatcher;
if ( isset( self::$notAllowed[$name] ) ) {
$allowed = false;
} elseif ( $name === 'font' && (
isset( $attrs['color'] ) || isset( $attrs['face'] ) || isset( $attrs['size'] ) )
) {
$allowed = false;
} else {
$allowed = true;
}
if ( !$allowed ) {
$builder->error( "unexpected <$name> tag in foreign content", $sourceStart );
if ( !$builder->isFragment ) {
do {
$builder->pop( $sourceStart, 0 );
} while ( $stack->current && !$this->isIntegrationPoint( $stack->current ) );
$dispatcher->startTag( $name, $attrs, $selfClose, $sourceStart, $sourceLength );
return;
}
}
$acnNs = $builder->adjustedCurrentNode()->namespace;
if ( $acnNs === HTMLData::NS_MATHML ) {
$attrs = new ForeignAttributes( $attrs, 'math' );
} elseif ( $acnNs === HTMLData::NS_SVG ) {
$attrs = new ForeignAttributes( $attrs, 'svg' );
$name = self::$svgElementCase[$name] ?? $name;
} else {
$attrs = new ForeignAttributes( $attrs, 'other' );
}
$dispatcher->ack = true;
$builder->insertForeign( $acnNs, $name, $attrs, $selfClose, $sourceStart, $sourceLength );
}
public function endTag( $name, $sourceStart, $sourceLength ) {
$builder = $this->builder;
$stack = $builder->stack;
$dispatcher = $this->dispatcher;
$node = $stack->current;
if ( strcasecmp( $node->name, $name ) !== 0 ) {
$builder->error( "mismatched end tag in foreign content", $sourceStart );
}
for ( $idx = $stack->length() - 1; $idx > 0; $idx-- ) {
if ( strcasecmp( $node->name, $name ) === 0 ) {
$builder->popAllUpToElement( $node, $sourceStart, $sourceLength );
break;
}
$node = $stack->item( $idx - 1 );
if ( $node->namespace === HTMLData::NS_HTML ) {
$dispatcher->getHandler()->endTag( $name, $sourceStart, $sourceLength );
break;
}
}
}
public function endDocument( $pos ) {
// @phan-suppress-previous-line PhanPluginNeverReturnMethod
throw new TreeBuilderError( "unspecified, presumed unreachable" );
}
}

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Expires
Sat, Oct 3, 10:59 (1 w, 1 d ago)
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InForeignContent.php (6 KB)

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