Function parseCssUrls

lib/html/HtmlParser.js:223–261

(input)

 * @returns {ParsedSource[]} url references
 */
const parseCssUrls = (input) => {
	const ts = new TokenStream(input);
	/** @type {ParsedSource[]} */
	const result = [];
	for (;;) {
		const t = ts.consume();
		if (t.type === TT_EOF) break;
		if (t.type === TT_URL) {
			if (t.contentEnd > t.contentStart) {
				result.push([
					input.slice(t.contentStart, t.contentEnd),
					t.contentStart,
					t.contentEnd
				]);
			}
		} else if (
			t.type === TT_FUNCTION &&
			equalsLowerCase(input.slice(t.start, t.end - 1), "url")
		) {
			let s = ts.consume();
			while (s.type === TT_WHITESPACE) s = ts.consume();
			if (s.type === TT_STRING) {
				const quote = input.charCodeAt(s.start);
				const innerStart = s.start + 1;
				// Drop the closing quote, unless the string is unterminated at EOF.
				const innerEnd =
					input.charCodeAt(s.end - 1) === quote ? s.end - 1 : s.end;
				if (innerEnd > innerStart) {
					result.push([
						input.slice(innerStart, innerEnd),
						innerStart,
						innerEnd
					]);
				}
			}
		}
	}
	return result;
};

/**
 * @param {Map<string, string>} attributes attributes