Function consumeAUrlToken

lib/css/syntax.js:789–837

* Consume an unquoted url token. Caller has already eaten `url(` and * any leading whitespace. * @param {string} input input * @param {number} pos position at the first content code point * @param {number} fnStart byte offset of the `u` in `url(` * @param {MutableToken} out token to populate *

(input, pos, fnStart, out)

 * @returns {MutableToken | undefined} the resulting token, or undefined at EOF
 */
function consumeAUrlToken(input, pos, fnStart, out) {
	while (_isWhiteSpace(input.charCodeAt(pos))) pos++;
	const contentStart = pos;
	out.contentStart = contentStart;
	for (;;) {
		if (pos === input.length) {
			out.contentEnd = pos - 1;
			return fill(out, TT_URL, fnStart, pos);
		}
		const cc = input.charCodeAt(pos);
		pos++;
		if (cc === CC_RIGHT_PARENTHESIS) {
			out.contentEnd = pos - 1;
			return fill(out, TT_URL, fnStart, pos);
		}
		if (_isWhiteSpace(cc)) {
			const end = pos - 1;
			while (_isWhiteSpace(input.charCodeAt(pos))) pos++;
			if (pos === input.length) {
				out.contentEnd = end;
				return fill(out, TT_URL, fnStart, pos);
			}
			if (input.charCodeAt(pos) === CC_RIGHT_PARENTHESIS) {
				pos++;
				out.contentEnd = end;
				return fill(out, TT_URL, fnStart, pos);
			}
			pos = _consumeTheRemnantsOfABadUrl(input, pos);
			return fill(out, TT_BAD_URL_TOKEN, fnStart, pos);
		}
		if (
			cc === CC_QUOTATION_MARK ||
			cc === CC_APOSTROPHE ||
			cc === CC_LEFT_PARENTHESIS ||
			_isNonPrintableCodePoint(cc)
		) {
			pos = _consumeTheRemnantsOfABadUrl(input, pos);
			return fill(out, TT_BAD_URL_TOKEN, fnStart, pos);
		}
		if (cc === CC_REVERSE_SOLIDUS) {
			if (_ifTwoCodePointsAreValidEscape(input, pos)) {
				pos = _consumeAnEscapedCodePoint(input, pos);
			} else {
				pos = _consumeTheRemnantsOfABadUrl(input, pos);
				return fill(out, TT_BAD_URL_TOKEN, fnStart, pos);
			}
		}
	}
}

/**
 * Consume an ident-like token: ident / function / url / bad-url.