private static ExpressionNode ParseValue(Parser.State state)
{
state.Save();
var token = state.GetTokenAndMoveNe();
if (token.Is(TokenType.Number))
{
state.Drop();
return(new NumberNode(
value: token.Value,
isDecimal: token.Is(TokenSubType.Decimal)
));
}
else if (token.Is(TokenType.Identifier))
{
state.Drop();
return(new VariableNode(token.Value));
}
else if (token.Is(TokenType.String))
{
state.Drop();
return(new StringNode(token.Value));
}
else if (token.Is(TokenSubType.BraceRoundLeft))
{
state.Drop();
var node = Parse(state);
if (state.IsErrorOccured())
{
return(node);
}
if (!state.GetToken().Is(TokenSubType.BraceRoundRight))
{
state.ErrorCode = (uint)ErrorCodes.P_ClosingBraceRequired;
state.ErrorMessage =
"Expected <BraceRoundRight>, " +
$"but <{state.GetToken().SubType}> was given";
return(node);
}
state.GetNextNeToken();
return(node);
}
state.Restore();
return(null);
}
public static void ParseParametersList(Parser.State state, FunctionNode function)
{
if (state.GetToken().Is(TokenType.EOF))
{
state.ErrorCode = (uint)ErrorCodes.T_UnexpectedEndOfFile;
state.ErrorMessage = "Required <Identifier> as a function parameter";
return;
}
state.Save();
var token = state.GetTokenAndMoveNe();
if (!token.Is(TokenType.Identifier))
{
state.Restore();
state.ErrorCode = (uint)ErrorCodes.P_IdentifierExpected;
state.ErrorMessage = "Required <Identifier> as a function parameter";
return;
}
state.Drop();
function.Parameter = new VariableNode(token.Value);
if (!state.GetToken().Is(TokenSubType.BraceSquareRight))
{
state.ErrorCode = (uint)ErrorCodes.P_ClosingBraceRequired;
state.ErrorMessage = "Required <BraceSquareRight> at the end of the function parameters list";
return;
}
state.GetNextNeToken();
}