/// <summary>
/// Reg expression 3 testData
/// </summary>
public TestRegExp()
{
a = new RegExpression("a");
b = new RegExpression("b");
// expr1: "baa"
expr1 = new RegExpression("baa");
// expr2: "bb"
expr2 = new RegExpression("bb");
// expr3: "baa | baa"
expr3 = expr1.Or(expr2);
// all: "(a|b)*"
all = (a.Or(b)).Star();
// expr4: "(baa | baa)+"
expr4 = expr3.Plus();
// expr5: "(baa | baa)+ (a|b)*"
expr5 = expr4.Dot(all);
}
/// <summary>
/// Converts a string to a regExpressionObject.
/// </summary>
/// <param name="regexString">The regex string.</param>
/// <returns></returns>
public RegExpression StringToRegExpression(RegExpression regex, string regexString)
{
// Remove spaces
regexString = regexString.Replace(" ", String.Empty);
// Seperate all terminals
char[] seperators = { '+', '*', '|', '(', ')' };
List <string> terminalParts = regexString.Split(seperators).ToList();
terminalParts.RemoveAll(x => x == String.Empty);
int terminalIndex = 0;
int maxTerminals = terminalParts.Count();
int i = 0;
while (i < regexString.Length)
{
char currentChar = regexString[i];
// For everything between ( )
if (currentChar == '(')
{
int closingBracketPosition = -1;
int bracketCount = 0;
for (int j = i + 1; i < regexString.Length; j++)
{
if (regexString[j] == '(')
{
bracketCount++;
}
// We found the matching closing bracket
if (regexString[j] == ')' && bracketCount == 0)
{
closingBracketPosition = j;
break;
}
if (regexString[j] == ')' && bracketCount != 0)
{
bracketCount--;
}
}
// Get the regex for the part between ()
string between = regexString.Substring(i + 1, closingBracketPosition - 1 - i);
RegExpression regExpression = StringToRegExpression(new RegExpression(), between);
// Look for the part after closing bracket
if (closingBracketPosition + 1 < regexString.Length)
{
i = closingBracketPosition + 1;
currentChar = regexString[i];
if (currentChar == '+')
{
regExpression = regExpression.Plus();
}
else if (currentChar == '*')
{
regExpression = regExpression.Star();
}
}
if (regex.terminals == "" && regex.o == Operator.ONE)
{
regex = regExpression;
}
else
{
regex = regex.Dot(regExpression);
}
}
// For all the operators not related to ()
else if (currentChar == '+')
{
regex = regex.Plus();
}
else if (currentChar == '*')
{
regex = regex.Star();
}
else if (currentChar == '|')
{
regex = regex.Or(new RegExpression(terminalParts[terminalIndex].ToString()));
terminalIndex++;
i++;
}
else
{
if (regex.terminals == "" && regex.o == Operator.ONE)
{
regex.terminals = terminalParts[terminalIndex];
// Skip rest of the terminal part in the loop
int num = regex.terminals.Count();
i += terminalParts[terminalIndex].Length - 1;
terminalIndex++;
}
else
{
//regex = regex.Dot(new RegExpression(currentChar.ToString()));
}
}
i++;
}
//for (int i = 0; i < regexString.Length; i++)
//{
// char currentChar = regexString[i];
// // For everything between ( )
// if (currentChar == '(')
// {
// int closingBracketPosition = -1;
// int bracketCount = 0;
// for (int j = i + 1; i < regexString.Length; j++)
// {
// if (regexString[j] == '(') bracketCount++;
// // We found the matching closing bracket
// if (regexString[j] == ')' && bracketCount == 0)
// {
// closingBracketPosition = j;
// break;
// }
// if (regexString[j] == ')' && bracketCount != 0)
// {
// bracketCount--;
// }
// }
// // Get the regex for the part between ()
// string between = regexString.Substring(i + 1, closingBracketPosition - 1 - i);
// RegExpression regExpression = StringToRegExpression(new RegExpression(), between);
// // Look for the part after closing bracket
// if (closingBracketPosition + 1 < regexString.Length)
// {
// i = closingBracketPosition + 1;
// currentChar = regexString[i];
// if (currentChar == '+')
// {
// regExpression = regExpression.Plus();
// }
// else if (currentChar == '*')
// {
// regExpression = regExpression.Star();
// }
// }
// if (regex.terminals == "" && regex.o == Operator.ONE)
// {
// regex = regExpression;
// }
// else
// {
// regex = regex.Dot(regExpression);
// }
// }
// // For all the operators not related to ()
// else if (currentChar == '+')
// {
// regex = regex.Plus();
// }
// else if (currentChar == '*')
// {
// regex = regex.Star();
// }
// else if (currentChar == '|')
// {
// regex = regex.Or(new RegExpression(terminalParts[terminalIndex].ToString()));
// terminalIndex++;
// i++;
// }
// else
// {
// if (regex.terminals == "" && regex.o == Operator.ONE)
// {
// regex.terminals = terminalParts[terminalIndex];
// // Skip rest of the terminal part in the loop
// int num = regex.terminals.Count();
// i += terminalParts[terminalIndex].Length - 1;
// terminalIndex++;
// }
// else
// {
// //regex = regex.Dot(new RegExpression(currentChar.ToString()));
// }
// }
//}
return(regex);
}
