private bool Statement()
{
Token tmp = lexer.Peek();
switch(tmp.Type)
{
case TokenType.Semicolon:
MatchExact(TokenType.Semicolon);
break;
case TokenType.LeftBrace:
Block();
break;
case TokenType.Identifier:
Assignment();
break;
case TokenType.If:
IF();
break;
case TokenType.While:
While();
break;
default:
return false;
}
return true;
}