Function consumeAnIdentLikeToken

lib/css/syntax.js:846–887

* Consume an ident-like token: ident / function / url / bad-url. * @param {string} input input * @param {number} pos position at the first ident-start code point * @param {MutableToken} out token to populate * @returns {MutableToken | undefined} the resulting token, or undefined at EOF

(input, pos, out)

 * @returns {MutableToken | undefined} the resulting token, or undefined at EOF
 */
function consumeAnIdentLikeToken(input, pos, out) {
	const start = pos;
	pos = _consumeAnIdentSequence(input, pos);
	// `url` case-insensitively (ASCII lower via `| 0x20`) without a
	// `slice().toLowerCase()` allocation per identifier; an escaped ident can't
	// be exactly 3 raw chars, so the length gate keeps this equivalent.
	if (
		pos - start === 3 &&
		(input.charCodeAt(start) | 0x20) === CC_LOWER_U &&
		(input.charCodeAt(start + 1) | 0x20) === CC_LOWER_R &&
		(input.charCodeAt(start + 2) | 0x20) === CC_LOWER_L &&
		input.charCodeAt(pos) === CC_LEFT_PARENTHESIS
	) {
		pos++;
		const end = pos;
		while (
			_isWhiteSpace(input.charCodeAt(pos)) &&
			_isWhiteSpace(input.charCodeAt(pos + 1))
		) {
			pos++;
		}
		if (
			input.charCodeAt(pos) === CC_QUOTATION_MARK ||
			input.charCodeAt(pos) === CC_APOSTROPHE ||
			(_isWhiteSpace(input.charCodeAt(pos)) &&
				(input.charCodeAt(pos + 1) === CC_QUOTATION_MARK ||
					input.charCodeAt(pos + 1) === CC_APOSTROPHE))
		) {
			// End at `end` (the `(`'s closer position), not `pos` — the
			// lookahead-eaten whitespace must be re-tokenized as a whitespace
			// token rather than swallowed silently. The reader resumes at
			// `token.end`, so returning `end` here does that.
			return fill(out, TT_FUNCTION, start, end);
		}
		return consumeAUrlToken(input, pos, start, out);
	}
	if (input.charCodeAt(pos) === CC_LEFT_PARENTHESIS) {
		pos++;
		return fill(out, TT_FUNCTION, start, pos);
	}
	return fill(out, TT_IDENTIFIER, start, pos);
}

/**
 * `<` — CDO or delim.