private bool Match(SearchPattern2.Op op, string text, int ptr)
{
while (op != null)
{
switch (op.Code)
{
case SearchPattern2.OpCode.ExactString:
{
int length = op.Argument.Length;
if (ptr + length > text.Length)
{
return(false);
}
string text2 = text.Substring(ptr, length);
if (this.ignore)
{
text2 = text2.ToLower();
}
if (text2 != op.Argument)
{
return(false);
}
ptr += length;
break;
}
case SearchPattern2.OpCode.AnyChar:
if (++ptr > text.Length)
{
return(false);
}
break;
case SearchPattern2.OpCode.AnyString:
while (ptr <= text.Length)
{
if (this.Match(op.Next, text, ptr))
{
return(true);
}
ptr++;
}
return(false);
case SearchPattern2.OpCode.End:
return(ptr == text.Length);
case SearchPattern2.OpCode.True:
return(true);
}
op = op.Next;
}
return(true);
}
private void Compile(string pattern)
{
if (pattern == null || pattern.IndexOfAny(SearchPattern2.InvalidChars) >= 0)
{
throw new ArgumentException("Invalid search pattern: '" + pattern + "'");
}
if (pattern == "*")
{
this.ops = new SearchPattern2.Op(SearchPattern2.OpCode.True);
this.hasWildcard = true;
return;
}
this.ops = null;
int i = 0;
SearchPattern2.Op op = null;
while (i < pattern.Length)
{
char c = pattern[i];
SearchPattern2.Op op2;
if (c != '*')
{
if (c != '?')
{
op2 = new SearchPattern2.Op(SearchPattern2.OpCode.ExactString);
int num = pattern.IndexOfAny(SearchPattern2.WildcardChars, i);
if (num < 0)
{
num = pattern.Length;
}
op2.Argument = pattern.Substring(i, num - i);
if (this.ignore)
{
op2.Argument = op2.Argument.ToLower();
}
i = num;
}
else
{
op2 = new SearchPattern2.Op(SearchPattern2.OpCode.AnyChar);
i++;
this.hasWildcard = true;
}
}
else
{
op2 = new SearchPattern2.Op(SearchPattern2.OpCode.AnyString);
i++;
this.hasWildcard = true;
}
if (op == null)
{
this.ops = op2;
}
else
{
op.Next = op2;
}
op = op2;
}
if (op == null)
{
this.ops = new SearchPattern2.Op(SearchPattern2.OpCode.End);
}
else
{
op.Next = new SearchPattern2.Op(SearchPattern2.OpCode.End);
}
}
public Op(SearchPattern2.OpCode code)
{
this.Code = code;
this.Argument = null;
this.Next = null;
}