public RegularExpressionTransformer(string regularExpression)
{
this.regularExpression = regularExpression;
RegularExpressionPart regularExpressionPart = new RegularExpressionPart()
{
RegularExpression = regularExpression,
RegularExpressionPosition = 0
};
}
public StateMaschine Match(string regularExpression)
{
RegularExpressionPart regularExpressionPart = new RegularExpressionPart()
{
RegularExpression = regularExpression,
RegularExpressionPosition = 0
};
StateMaschine stateMaschine = new StateMaschine();
var result = LoopMatch(regularExpressionPart, stateMaschine);
return(stateMaschine);
}
public StateMaschine LoopMatch(RegularExpressionPart regularExpressionPart, StateMaschine stateMaschine)
{
var length = regularExpressionPart.RegularExpression.ToArray().Length;
State previousState = null;
State jumpState = null;
var minLength = 0;
for (int i = 0; i < length; i++)
{
var actualIndex = i;
var character = regularExpressionPart.RegularExpression.ToArray()[i];
if (character == LexerItems.Point)
{
previousState = stateMaschine.AddState(actualIndex, character.ToString(), previousState);
minLength++;
jumpState = null;
}
else if (character == LexerItems.Star)
{
State tempPreviousState = previousState;
previousState = stateMaschine.AddState(actualIndex, character.ToString(), previousState);
if (jumpState != null)
{
previousState.StatusTransitions_.Add(new StatusTransition(jumpState));
}
else
{
previousState.StatusTransitions_.Add(new StatusTransition(tempPreviousState));
}
jumpState = null;
}
else if (character == LexerItems.QuestionMark)
{
previousState = stateMaschine.AddState(actualIndex, character.ToString(), previousState);
}
else if (character == LexerItems.OpenBracket)
{
State state = new State(actualIndex, character.ToString());
bracketOperations.Push(state);
previousState = stateMaschine.AddState(state, previousState);
}
else if (character == LexerItems.CloseBracket)
{
State state = new State(actualIndex, character.ToString());
previousState = stateMaschine.AddState(state, previousState);
var tempState = bracketOperations.Pop();
if (tempState.Value == LexerItems.Pipe.ToString())
{
tempState.StatusTransitions_.Add(new StatusTransition(state));
tempState = bracketOperations.Pop();
if (tempState.Value != LexerItems.Pipe.ToString())
{
jumpState = tempState;
}
}
else
{
jumpState = tempState;
}
}
else if (character == LexerItems.Pipe)
{
State state = new State(actualIndex, character.ToString());
State bracketOperation = bracketOperations.Peek();
bracketOperations.Push(state);
previousState = stateMaschine.AddState(state, previousState);
var previewCharacter = regularExpressionPart.RegularExpression.ToArray()[i + 1];
State nextCharacter = new State(actualIndex + 1, previewCharacter.ToString());
bracketOperation.StatusTransitions_.Add(new StatusTransition(nextCharacter));
if (nextCharacter.Value == LexerItems.OpenBracket.ToString())
{
bracketOperations.Push(nextCharacter);
}
stateMaschine.ActualState = nextCharacter;
previousState = nextCharacter;
i++;
jumpState = null;
minLength = 0;
}
else
{
previousState = stateMaschine.AddState(actualIndex, character.ToString(), previousState);
minLength++;
jumpState = null;
}
if (stateMaschine.MinLength < minLength)
{
stateMaschine.MinLength = minLength;
}
}
previousState.IsPreviewEndeState = true;
stateMaschine.AddState(length, "Ende", previousState);
return(stateMaschine);
}