private Rule ParseString(string str, int idx)
{
Regex stateReg = new Regex(@"<\$[n,t,o]\$[^$]*>");
Regex stateTypeReg = new Regex(@"\$(n|t|o)\$");
Regex nameReg = new Regex(@"\$[^\$]*>");
Rule Rule = new Rule();
MatchCollection matches = stateReg.Matches(str);
string str_match = matches[0].ToString();
string type = stateTypeReg.Match(str_match).ToString();
type = type.Substring(1, type.Length - 2);
if (type == "n")
{
string name = nameReg.Match(str_match).ToString();
name = name.Substring(1, name.Length - 4);
NonTerminal nonterm = new NonTerminal(name);
Rule.LeftPart = nonterm;
LoadedNonTerminals.Add(nonterm);
}
else
{
throw new Exception("terminal cannot spawn rules");
}
for (int j = 1; j < matches.Count; j++)
{
type = stateTypeReg.Match(matches[j].ToString()).ToString();
type = type.Substring(1, type.Length - 2);
str_match = matches[j].ToString();
string name = nameReg.Match(str_match).ToString();
name = name.Substring(1, name.Length - 2);
switch (type)
{
case "n":
NonTerminal nonterm = new NonTerminal(name);
LoadedNonTerminals.Add(nonterm);
Rule.RightPart.Add(nonterm);
break;
case "t":
Terminal term = new Terminal(name);
LoadedTerminals.Add(term);
Rule.RightPart.Add(term);
break;
case "o":
Operation operation = new Operation(name);
Rule.RightPart.Add(operation);
break;
default:
throw new Exception(string.Format("In {0} line type of state is not valid", idx + 1));
}
;
}
return(Rule);
}
public void Load(string filepath)
{
IList <string> text = new List <string>();
using (StreamReader sr = new StreamReader(filepath))
{
while (!sr.EndOfStream)
{
text.Add(sr.ReadLine());
}
}
if (text.Count > 0)
{
for (int i = 0; i < text.Count; i++)
{
Rule newRule = ParseString(text[i], i);
LoadedNonTerminals.Add(newRule.LeftPart);
foreach (IState state in newRule.RightPart)
{
if (state is NonTerminal)
{
LoadedNonTerminals.Add(state as NonTerminal);
}
else if (state is Terminal)
{
LoadedTerminals.Add(state as Terminal);
}
}
LoadedRules.Add(newRule);
}
LoadedNonTerminals = LoadedNonTerminals.DistinctBy(x => x.Name).ToList();
LoadedTerminals = LoadedTerminals.DistinctBy(x => x.Name).ToList();
//CreateRecognizeTable();
}
else
{
throw new Exception("Empty file");
}
}