public override (bool success, int offset) IsMatch(string text, int startOffset = 0)
{
int offset = startOffset;
bool success = true;
int subOffset;
PatternMatcher subPattern = _subPattern;
if (subPattern != null)
{
while (success)
{
(success, subOffset) = subPattern.IsMatch(text, offset);
offset += subOffset;
}
}
return(true, offset - startOffset);
}
public override (bool success, int offset) IsMatch(string text, int startOffset = 0)
{
int upperBounds = _upperBounds;
int offset = startOffset;
bool subSuccess = true;
int subOffset;
PatternMatcher subPattern = _subPattern;
int matches = 0;
for (; matches < upperBounds && subSuccess; matches++)
{
(subSuccess, subOffset) = subPattern.IsMatch(text, offset);
offset += subOffset;
}
bool success = subSuccess || matches >= _lowerBounds;
return(success ? (true, offset - startOffset) : (false, 0));
}
private PatternMatcher AsOrGroupPatternMatcher(string pattern)
{
List <PatternMatcher> matchers = new List <PatternMatcher>();
PatternMatcher lastMatcher = null;
bool terminate = false;
while (Offset < pattern.Length && !terminate)
{
switch (pattern[Offset++])
{
case '\\':
lastMatcher = AsSpecialMatcher(pattern);
matchers.Add(lastMatcher);
break;
case '.':
lastMatcher = new AnyPatternMatcher();
matchers.Add(lastMatcher);
break;
case '(':
lastMatcher = AsGroupMatcher(pattern);
matchers.Add(lastMatcher);
break;
case '[':
lastMatcher = AsCharBoundsMatcher(pattern);
matchers.Add(lastMatcher);
break;
case '*':
lastMatcher = new WildcardPatternMatcher(lastMatcher);
matchers.SetLast(lastMatcher);
break;
case '+':
lastMatcher = new OneOrMorePatternMatcher(lastMatcher);
matchers.SetLast(lastMatcher);
break;
case '?':
lastMatcher = new OptionalPatternMatcher(lastMatcher);
matchers.SetLast(lastMatcher);
break;
case '|':
terminate = true;
break;
case ')':
Offset--;
terminate = true;
break;
case '{':
lastMatcher = AsCountBoundsMatcher(pattern, lastMatcher);
matchers.SetLast(lastMatcher);
break;
default:
Offset--;
lastMatcher = AsLiteralMatcher(pattern);
matchers.Add(lastMatcher);
break;
}
}
return(matchers.Count == 1 ? matchers[0] : new GroupPatternMatcher(matchers));
}