private void analyze()
{
_elements = new List<PatternElement>();
char c;
bool escaped = false;
bool inCommentLine = false;
PatternComment commentLine = null;
bool inCommentGroup = false;
bool inCharClass = false;
int groupDepth = -1;
var groupStack = new List<PatternGroup>();
for (int i = 0; i < _pattern.Length; i++)
{
if (!escaped)
{
c = _pattern[i];
switch (c)
{
case '(':
if (!inCharClass)
{
groupDepth++;
var group = new PatternGroup { StartIndex = i };
switch (_pattern.Substring(i + 1, 2))
{
case "?<":
group.Type = PatterGroupType.NamedCapture;
break;
case"?:":
group.Type = PatterGroupType.Noncapture;
break;
case "?>":
group.Type = PatterGroupType.Atomic;
break;
case "?=":
case "?!":
group.Type = PatterGroupType.LookAround;
break;
case "?#":
group.Type = PatterGroupType.Comment;
inCommentGroup = true;
break;
}
groupStack.Add(group);
_elements.Add(group);
}
break;
case ')':
if (!inCharClass && !inCommentLine)
{
groupStack[groupDepth].EndIndex = i;
groupDepth--;
}
break;
case '#':
if (!inCharClass)
{
inCommentLine = true;
commentLine = new PatternComment { StartIndex = i };
_elements.Add(commentLine);
}
break;
case '\n':
if (inCommentLine)
{
inCommentLine = false;
commentLine.EndIndex = i;
}
break;
}
}
else
{
escaped = false;
}
}
if (inCommentLine)
{
inCommentLine = false;
commentLine.EndIndex = _pattern.Length - 1;
}
}
public virtual void Exit(PatternComment patternComment)
{
}
public virtual UstNode Visit(PatternComment patternComment)
{
return(VisitChildren(patternComment));
}
public virtual void Enter(PatternComment patternComment)
{
}