public FSMLexerBuilder <N> End(N nodeValue)
{
if (Fsm.HasState(CurrentState))
{
FSMNode <N> node = Fsm.GetNode(CurrentState);
node.IsEnd = true;
node.Value = nodeValue;
}
return(this);
}
private FSMNode <N> Move(FSMNode <N> from, char token, ReadOnlyMemory <char> value)
{
if (from != null && Transitions.TryGetValue(from.Id, out var transitions))
{
// Do NOT use Linq, increases allocations AND running time
for (var i = 0; i < transitions.Count; ++i)
{
var transition = transitions[i];
if (transition.Match(token, value))
{
return(Nodes[transition.ToNode]);
}
}
}
return(null);
}
public FSMMatch <N> Run(string source, int start)
{
string value = "";
var result = new FSMMatch <N>(false);
var successes = new Stack <FSMMatch <N> >();
CurrentPosition = start;
FSMNode <N> currentNode = Nodes[0];
int lastNode = 0;
TokenPosition position = null;
bool tokenStarted = false;
if (CurrentPosition < source.Length)
{
char currentToken = source[CurrentPosition];
while (CurrentPosition < source.Length && currentNode != null)
{
currentToken = source[CurrentPosition];
bool consumeSkipped = true;
while (consumeSkipped && !tokenStarted && CurrentPosition < source.Length)
{
currentToken = source[CurrentPosition];
if (IgnoreWhiteSpace && WhiteSpaces.Contains(currentToken))
{
if (successes.Any())
{
currentNode = null;
}
else
{
currentNode = Nodes[0];
}
CurrentPosition++;
CurrentColumn++;
}
else
{
var eol = EOLManager.IsEndOfLine(source, CurrentPosition);
if (IgnoreEOL && eol != EOLType.No)
{
if (successes.Any())
{
currentNode = null;
}
else
{
currentNode = Nodes[0];
}
CurrentPosition += (eol == EOLType.Windows ? 2 : 1);
CurrentColumn = 0;
CurrentLine++;
}
else
{
consumeSkipped = false;
}
}
}
currentNode = Move(currentNode, currentToken, value);
if (currentNode != null)
{
lastNode = currentNode.Id;
value += currentToken;
if (!tokenStarted)
{
tokenStarted = true;
position = new TokenPosition(CurrentPosition, CurrentLine, CurrentColumn);
}
if (currentNode.IsEnd)
{
var resultInter = new FSMMatch <N>(true, currentNode.Value, value, position);
successes.Push(resultInter);
}
if (HasAction(currentNode.Id))
{
value = Actions[currentNode.Id](value);
}
CurrentPosition++;
CurrentColumn++;
}
else
{
if (lastNode == 0 && !tokenStarted && !successes.Any() && CurrentPosition < source.Length)
{
throw new LexerException(new LexicalError(CurrentLine, CurrentColumn, source[CurrentPosition]));
}
;
}
}
}
if (successes.Any())
{
result = successes.Pop();
if (HasCallback(lastNode))
{
result = Callbacks[lastNode](result);
}
}
return(result);
}
