public override void VisitLeave(LimitingRepetition expression)
{
Int32? max = expression.Max;
Int32? min = expression.Min;
IsMatchPredicate local = _matchStack.Pop();
_matchStack.Push(
delegate(IInputIterator iterator)
{
Int32 cnt = 0;
Int32 savePosition = iterator.Index;
Boolean result = false;
if (expression.VariableLengthExpression == null)
{
if (min != null)
{
if (max == null)
{
// has a minimum but no max cap
savePosition = iterator.Index;
while (local(iterator))
{
cnt++;
if (savePosition == iterator.Index)
{
//InfiniteLoopDetectedException
break;
}
savePosition = iterator.Index;
}
iterator.Index = savePosition;
result = (cnt >= min);
}
else
{
// has a minimum and a max specified
if (max < min)
{
throw new ArgumentException(
"A Max property must be larger than Min when using LimitingRepetition.");
}
savePosition = iterator.Index;
while (local(iterator))
{
cnt++;
savePosition = iterator.Index;
if (cnt >= max)
{
break;
}
}
iterator.Index = savePosition;
result = (cnt <= max && cnt >= min);
}
}
else // min == null
{
if (max == null)
{
throw new ArgumentException(
"A Min and/or Max must be specified when using LimitingRepetition.");
}
// zero or up to a max matches of e.
savePosition = iterator.Index;
while (local(iterator))
{
cnt++;
savePosition = iterator.Index;
if (cnt >= max)
{
break;
}
}
iterator.Index = savePosition;
result = (cnt <= max);
}
}
else
{
var variableValues = _sandbox.Peek().ToArray().SelectMany(x=>x.Children).ToList();
var varLengthBytes = Encoding.UTF8.GetBytes(expression.VariableLengthExpression);
var varLengthIterator = new ByteInputIterator(varLengthBytes);
var varLengthParser = new LimitingRepetitionVariableLengthExpressionParser();
var varLengthParseTree = varLengthParser.Parse(varLengthIterator);
var varLengthSolver = new LimitingRepetitionVariableLengthExpressionSolver(varLengthIterator, iterator, variableValues);
varLengthParseTree.Accept(varLengthSolver);
var value = (int)varLengthSolver.Result;
savePosition = iterator.Index;
while (value > cnt && local(iterator))
{
cnt++;
savePosition = iterator.Index;
if (cnt == value)
{
break;
}
}
iterator.Index = savePosition;
result = (cnt == value);
}
return result;
}
);
}
public override void VisitEnter(LimitingRepetition expression)
{
}
public override void VisitExecute(LimitingRepetition expression)
{
}
public override void VisitLeave(LimitingRepetition expression)
{
terminal.Peek().Append("){");
if (expression.Max == expression.Min)
{
if (expression.Min == null)
throw new ArgumentException("Min and Max should not be null.");
// exact count
terminal.Peek().Append(expression.Max.ToString());
}
else if (expression.Max == null)
{
// only min limit
terminal.Peek().Append(expression.Min.ToString());
terminal.Peek().Append(",");
}
else if (expression.Min == null)
{
// only max limit
terminal.Peek().Append(",");
terminal.Peek().Append(expression.Max.ToString());
}
else
{
// both min and max limit set
terminal.Peek().Append(expression.Min.ToString());
terminal.Peek().Append(",");
terminal.Peek().Append(expression.Max.ToString());
}
terminal.Peek().Append(@"}");
}
public override void VisitEnter(LimitingRepetition expression)
{
terminal.Peek().Append("(");
}
public abstract void VisitEnter(LimitingRepetition expression);
public abstract void VisitLeave(LimitingRepetition expression);
public abstract void VisitExecute(LimitingRepetition expression);
