Function parseReference

src/parser/syntaxes/expressions.ts:553–576

* ```abnf * Reference = IDENT *(":" IDENT) * ```

(s: ITokenStream)

 * ```
*/
function parseReference(s: ITokenStream): Ast.Identifier {
	const startPos = s.getPos();

	const segs: string[] = [];
	while (true) {
		if (segs.length > 0) {
			if (s.is(TokenKind.Colon)) {
				if (s.getToken().hasLeftSpacing) {
					throw new AiScriptSyntaxError('Cannot use spaces in a reference.', s.getPos());
				}
				s.next();
				if (s.getToken().hasLeftSpacing) {
					throw new AiScriptSyntaxError('Cannot use spaces in a reference.', s.getPos());
				}
			} else {
				break;
			}
		}
		s.expect(TokenKind.Identifier);
		segs.push(s.getTokenValue());
		s.next();
	}
	return NODE('identifier', { name: segs.join(':') }, startPos, s.getPos());
}

/**
 * ```abnf