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her an element of a given name is in the HTML special category. * * @since 6.4.0 * * @see https://html.spec.whatwg.org/#special * * @param WP_HTML_Token|string $tag_name Node to check, or only its name if in the HTML namespace. * @return bool Whether the element of the given name is in the special category. */ public static function is_special( $tag_name ): bool { if ( is_string( $tag_name ) ) { $tag_name = strtoupper( $tag_name ); } else { $tag_name = 'html' === $tag_name->namespace ? strtoupper( $tag_name->node_name ) : "{$tag_name->namespace} {$tag_name->node_name}"; } return ( 'ADDRESS' === $tag_name || 'APPLET' === $tag_name || 'AREA' === $tag_name || 'ARTICLE' === $tag_name || 'ASIDE' === $tag_name || 'BASE' === $tag_name || 'BASEFONT' === $tag_name || 'BGSOUND' === $tag_name || 'BLOCKQUOTE' === $tag_name || 'BODY' === $tag_name || 'BR' === $tag_name || 'BUTTON' === $tag_name || 'CAPTION' === $tag_name || 'CENTER' === $tag_name || 'COL' === $tag_name || 'COLGROUP' === $tag_name || 'DD' === $tag_name || 'DETAILS' === $tag_name || 'DIR' === $tag_name || 'DIV' === $tag_name || 'DL' === $tag_name || 'DT' === $tag_name || 'EMBED' === $tag_name || 'FIELDSET' === $tag_name || 'FIGCAPTION' === $tag_name || 'FIGURE' === $tag_name || 'FOOTER' === $tag_name || 'FORM' === $tag_name || 'FRAME' === $tag_name || 'FRAMESET' === $tag_name || 'H1' === $tag_name || 'H2' === $tag_name || 'H3' === $tag_name || 'H4' === $tag_name || 'H5' === $tag_name || 'H6' === $tag_name || 'HEAD' === $tag_name || 'HEADER' === $tag_name || 'HGROUP' === $tag_name || 'HR' === $tag_name || 'HTML' === $tag_name || 'IFRAME' === $tag_name || 'IMG' === $tag_name || 'INPUT' === $tag_name || 'KEYGEN' === $tag_name || 'LI' === $tag_name || 'LINK' === $tag_name || 'LISTING' === $tag_name || 'MAIN' === $tag_name || 'MARQUEE' === $tag_name || 'MENU' === $tag_name || 'META' === $tag_name || 'NAV' === $tag_name || 'NOEMBED' === $tag_name || 'NOFRAMES' === $tag_name || 'NOSCRIPT' === $tag_name || 'OBJECT' === $tag_name || 'OL' === $tag_name || 'P' === $tag_name || 'PARAM' === $tag_name || 'PLAINTEXT' === $tag_name || 'PRE' === $tag_name || 'SCRIPT' === $tag_name || 'SEARCH' === $tag_name || 'SECTION' === $tag_name || 'SELECT' === $tag_name || 'SOURCE' === $tag_name || 'STYLE' === $tag_name || 'SUMMARY' === $tag_name || 'TABLE' === $tag_name || 'TBODY' === $tag_name || 'TD' === $tag_name || 'TEMPLATE' === $tag_name || 'TEXTAREA' === $tag_name || 'TFOOT' === $tag_name || 'TH' === $tag_name || 'THEAD' === $tag_name || 'TITLE' === $tag_name || 'TR' === $tag_name || 'TRACK' === $tag_name || 'UL' === $tag_name || 'WBR' === $tag_name || 'XMP' === $tag_name || // MathML. 'math MI' === $tag_name || 'math MO' === $tag_name || 'math MN' === $tag_name || 'math MS' === $tag_name || 'math MTEXT' === $tag_name || 'math ANNOTATION-XML' === $tag_name || // SVG. 'svg DESC' === $tag_name || 'svg FOREIGNOBJECT' === $tag_name || 'svg TITLE' === $tag_name ); } /** * Returns whether a given element is an HTML Void Element * * > area, base, br, col, embed, hr, img, input, link, meta, source, track, wbr * * @since 6.4.0 * * @see https://html.spec.whatwg.org/#void-elements * * @param string $tag_name Name of HTML tag to check. * @return bool Whether the given tag is an HTML Void Element. */ public static function is_void( $tag_name ): bool { $tag_name = strtoupper( $tag_name ); return ( 'AREA' === $tag_name || 'BASE' === $tag_name || 'BASEFONT' === $tag_name || // Obsolete but still treated as void. 'BGSOUND' === $tag_name || // Obsolete but still treated as void. 'BR' === $tag_name || 'COL' === $tag_name || 'EMBED' === $tag_name || 'FRAME' === $tag_name || 'HR' === $tag_name || 'IMG' === $tag_name || 'INPUT' === $tag_name || 'KEYGEN' === $tag_name || // Obsolete but still treated as void. 'LINK' === $tag_name || 'META' === $tag_name || 'PARAM' === $tag_name || // Obsolete but still treated as void. 'SOURCE' === $tag_name || 'TRACK' === $tag_name || 'WBR' === $tag_name ); } /** * Gets an encoding from a given string. * * This is an algorithm defined in the WHAT-WG specification. * * Example: * * 'UTF-8' === self::get_encoding( 'utf8' ); * 'UTF-8' === self::get_encoding( " \tUTF-8 " ); * null === self::get_encoding( 'UTF-7' ); * null === self::get_encoding( 'utf8; charset=' ); * * @see https://encoding.spec.whatwg.org/#concept-encoding-get * * @todo As this parser only supports UTF-8, only the UTF-8 * encodings are detected. Add more as desired, but the * parser will bail on non-UTF-8 encodings. * * @since 6.7.0 * * @param string $label A string which may specify a known encoding. * @return string|null Known encoding if matched, otherwise null. */ protected static function get_encoding( string $label ): ?string { /* * > Remove any leading and trailing ASCII whitespace from label. */ $label = trim( $label, " \t\f\r\n" ); /* * > If label is an ASCII case-insensitive match for any of the labels listed in the * > table below, then return the corresponding encoding; otherwise return failure. */ switch ( strtolower( $label ) ) { case 'unicode-1-1-utf-8': case 'unicode11utf8': case 'unicode20utf8': case 'utf-8': case 'utf8': case 'x-unicode20utf8': return 'UTF-8'; default: return null; } } /* * Constants that would pollute the top of the class if they were found there. */ /** * Indicates that the next HTML token should be parsed and processed. * * @since 6.4.0 * * @var string */ const PROCESS_NEXT_NODE = 'process-next-node'; /** * Indicates that the current HTML token should be reprocessed in the newly-selected insertion mode. * * @since 6.4.0 * * @var string */ const REPROCESS_CURRENT_NODE = 'reprocess-current-node'; /** * Indicates that the current HTML token should be processed without advancing the parser. * * @since 6.5.0 * * @var string */ const PROCESS_CURRENT_NODE = 'process-current-node'; /** * Indicates that the parser encountered unsupported markup and has bailed. * * @since 6.4.0 * * @var string */ const ERROR_UNSUPPORTED = 'unsupported'; /** * Indicates that the parser encountered more HTML tokens than it * was able to process and has bailed. * * @since 6.4.0 * * @var string */ const ERROR_EXCEEDED_MAX_BOOKMARKS = 'exceeded-max-bookmarks'; /** * Unlock code that must be passed into the constructor to create this class. * * This class extends the WP_HTML_Tag_Processor, which has a public class * constructor. Therefore, it's not possible to have a private constructor here. * * This unlock code is used to ensure that anyone calling the constructor is * doing so with a full understanding that it's intended to be a private API. * * @access private */ const CONSTRUCTOR_UNLOCK_CODE = 'Use WP_HTML_Processor::create_fragment() instead of calling the class constructor directly.'; }