private void AddToIdnTable(ref string token, ref int i)
{
if (OutputTokenTable.Table.Count != 0 && Checker.IsType(OutputTokenTable.Table.Last().Name))
{
if (IdnTable.Contains(token))
{
throw new Exception($"Error on {i + 1} line!\tThe variable '{token}' is already declared.");
}
else
{
IdnTable.Add(token);
}
}
else if (OutputTokenTable.Table.Count != 0 && OutputTokenTable.Table.Last().Name == ",")
{
if (IdnTable.Contains(token))
{
throw new Exception($"Error on {i + 1} line!\tThe variable '{token}' is already declared.");
}
else
{
IdnTable.Add(token);
}
}
else if (!IdnTable.Contains(token) && !TokenTable.Contains(token))
{
throw new Exception($"Error on {i + 1} line!\tThe variable '{token}' wasn't declared.");
}
}
private void AddToInternalTable(ref string token, ref int i)
{
if (TokenTable.Contains(token) && Checker.IsType(token))
{
Checker.Type = token;
}
else if (Checker.IsDigit(token))
{
AddToConTable(ref token, ref i);
}
else if (!string.IsNullOrEmpty(token))
{
AddToIdnTable(ref token, ref i);
}
}
public bool Parse(string[] programCode)
{
try
{
string token = string.Empty;
for (int i = 0; i < programCode.Length; i++)
{
int j = 0;
foreach (char ch in programCode[i])
{
if (ch.Equals('$'))
{
OutputTokenTable.Add(numRow: i, ch.ToString());
j++;
continue;
}
if (Checker.IsConstant(ch) ||
Checker.IsLetter(ch) ||
(Checker.IsSign(ch) && !string.IsNullOrEmpty(token) && Checker.IsExponent(token.Last())))
{
token += ch;
}
else if (Checker.IsSingleCharacterSeparator(ch) || Checker.IsWhiteSeparator(ch) || Checker.IsPossibleDoubleSeparator(ch))
{
AddToInternalTable(ref token, ref i);
if (ConTable.Contains(token) ||
IdnTable.Contains(token) ||
(TokenTable.Contains(token) && !Checker.IsDoubleSeparator(token + ch)))
{
OutputTokenTable.Add(numRow: i + 1, token);
token = string.Empty;
}
if (Checker.IsPossibleDoubleSeparator(ch))
{
if (!Checker.IsDoubleSeparator(token) &&
Checker.IsDoubleSeparator(ch.ToString()
+ ((programCode[i].Length - 1 != j) ? programCode[i][j + 1].ToString() : string.Empty)))
{
token += ch;
j++;
continue;
}
else
{
OutputTokenTable.Add(numRow: i + 1, token + ch);
token = string.Empty;
}
}
else if (Checker.IsSingleCharacterSeparator(ch))
{
OutputTokenTable.Add(numRow: i + 1, token + ch);
}
}
else
{
throw new Exception($"Error on {i + 1} line!\tUndefined exeption.");
}
j++;
}
}
return(true);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Alert", MessageBoxButton.OK);
return(false);
}
}
