protected Boolean ZeroOrMore(IsMatchPredicate expression, String grammarExpression)
{
Int32 savePosition = iterator.Index;
while (expression())
{
if (savePosition == iterator.Index)
{
Exception ex = new InfiniteLoopDetectedException();
ex.Data.Add("Iterator Index", iterator.Index);
ex.Data.Add("Grammar Expression", grammarExpression);
throw ex;
}
savePosition = iterator.Index;
}
iterator.Index = savePosition;
return(true);
}
protected Boolean LimitingRepetition(IsMatchPredicate expression, Int32?min, Int32?max, String grammarExpression)
{
Int32 cnt = 0;
Int32 savePosition = iterator.Index;
Boolean result = false;
if (min != null)
{
if (max == null)
{
// has a minimum but no max cap
savePosition = iterator.Index;
while (expression())
{
if (savePosition == iterator.Index)
{
Exception ex = new InfiniteLoopDetectedException();
ex.Data.Add("Iterator Index", iterator.Index);
ex.Data.Add("Grammar Expression", grammarExpression);
throw ex;
}
cnt++;
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 (expression())
{
cnt++;
savePosition = iterator.Index;
if (cnt >= max)
{
break;
}
}
iterator.Index = savePosition;
result = (cnt <= max && cnt >= min);
}
}
else
{
if (max == null)
{
throw new ArgumentException("A Min and/or Max must be specified when using LimitingRepetition.");
}
else
{
// zero or up to a max matches of e.
savePosition = iterator.Index;
while (expression())
{
cnt++;
savePosition = iterator.Index;
if (cnt >= max)
{
break;
}
}
iterator.Index = savePosition;
result = (cnt <= max);
}
}
return(result);
}
protected Boolean LimitingRepetition(IsMatchPredicate expression, Int32? min, Int32? max, String grammarExpression)
{
Int32 cnt = 0;
Int32 savePosition = iterator.Index;
Boolean result = false;
if (min != null)
{
if (max == null)
{
// has a minimum but no max cap
savePosition = iterator.Index;
while (expression())
{
if (savePosition == iterator.Index)
{
Exception ex = new InfiniteLoopDetectedException();
ex.Data.Add("Iterator Index", iterator.Index);
ex.Data.Add("Grammar Expression", grammarExpression);
throw ex;
}
cnt++;
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 (expression())
{
cnt++;
savePosition = iterator.Index;
if (cnt >= max)
{
break;
}
}
iterator.Index = savePosition;
result = (cnt <= max && cnt >= min);
}
}
else
{
if (max == null)
{
throw new ArgumentException("A Min and/or Max must be specified when using LimitingRepetition.");
}
else
{
// zero or up to a max matches of e.
savePosition = iterator.Index;
while (expression())
{
cnt++;
savePosition = iterator.Index;
if (cnt >= max)
{
break;
}
}
iterator.Index = savePosition;
result = (cnt <= max);
}
}
return result;
}
protected Boolean OneOrMore(IsMatchPredicate expression, String grammarExpression)
{
Int32 cnt = 0;
Int32 savePosition = iterator.Index;
while (expression())
{
if (savePosition == iterator.Index)
{
Exception ex = new InfiniteLoopDetectedException();
ex.Data.Add("Iterator Index", iterator.Index);
ex.Data.Add("Grammar Expression", grammarExpression);
throw ex;
}
savePosition = iterator.Index;
cnt++;
}
iterator.Index = savePosition;
return (cnt > 0);
}