Function parseBreak

src/parser/syntaxes/statements.ts:506–525

* ```abnf * Break = "break" ["#" IDENT [Expr]] * ```

(s: ITokenStream)

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

	s.expect(TokenKind.BreakKeyword);
	s.next();

	let label: string | undefined;
	let expr: Ast.Expression | undefined;
	if (s.is(TokenKind.Sharp)) {
		label = parseLabel(s);

		if (s.is(TokenKind.Colon)) {
			throw new AiScriptSyntaxError('cannot omit label from break if expression is given', startPos);
		} else if (!isStatementTerminator(s)) {
			expr = parseExpr(s, false);
		}
	}

	return NODE('break', { label, expr }, startPos, s.getPos());
}

/**
 * ```abnf