Function decodeHtmlEntitiesWithMap

lib/html/syntax.js:3738–3769

(str, isAttribute)

 * @returns {{ text: string, map: number[] | undefined }} decoded text and offset map
 */
const decodeHtmlEntitiesWithMap = (str, isAttribute) => {
	/** @type {number[] | undefined} */
	let map;
	if (str.includes("&")) {
		CHARACTER_REFERENCE_REGEXP.lastIndex = 0;
		let text = "";
		let last = 0;
		/** @type {RegExpExecArray | null} */
		let m;
		while ((m = CHARACTER_REFERENCE_REGEXP.exec(str)) !== null) {
			const match = m[0];
			const decoded = decodeOneReference(
				match,
				str.charCodeAt(m.index + match.length),
				isAttribute
			);
			if (decoded === match) continue;
			if (map === undefined) map = [];
			for (let r = last; r < m.index; r++) map.push(r);
			text += str.slice(last, m.index);
			for (let i = 0; i < decoded.length; i++) map.push(m.index);
			text += decoded;
			last = m.index + match.length;
		}
		if (map !== undefined) {
			for (let r = last; r < str.length; r++) map.push(r);
			map.push(str.length);
			return { text: text + str.slice(last), map };
		}
	}
	return { text: str, map };
};

// cspell:ignore advasoft altglyph altglyphdef altglyphitem animatecolor animatemotion animatetransform arcrole aswedit attributename attributetype basefrequency baseprofile bgsound calcmode clippathunits definitionurl diffuseconstant fedropshadow filterunits glyphref gradienttransform gradientunits hotjava hotmetal kernelmatrix kernelunitlength keypoints keysplines keytimes limitingconeangle malignmark markerheight markerwidth maskcontentunits maskunits metrius mglyph mtext numoctaves pathlength patterncontentunits patterntransform patternunits pointsatx pointsaty pointsatz preservealpha primitiveunits refx refy repeatcount repeatdur requiredextensions requiredfeatures selectedcontent silmaril softquad specularconstant specularexponent startoffset stddeviation stitchtiles surfacescale systemlanguage tablevalues targetx targety textlength viewbox viewtarget webtechs xchannelselector ychannelselector megamorphic attributeless rowspan imagesizes novalidate maxlength