/// <summary>
/// Compare the source against the pattern and if successfull returns a StringMatch
///
/// There match is done against the source which can contain the wildcard '*'
/// </summary>
private StringMatch buildWithWildcards(string source)
{
StringMatch res = new StringMatch
{
Text = source,
Segments = new List <string>(),
StartsOnMatch = false,
};
string pattern = (string)m_pattern;
string lsource = source.ToLower();
int iP = 0, iS = 0, icP = -1, icS = -1;
int ioS1 = -1, ioS2 = -1;
int NP = pattern.Length, NS = source.Length;
// skip all the starting characters untils we either don't match or reach a '*'
while ((iP != NP) && (iS != NS) && (pattern[iP] != '*'))
{
if (lsource[iS] != pattern[iP])
{
// mismatch
return(null);
}
iS++;
iP++;
}
if (iS != 0)
{
addChunkToStringMatch(res, source.Substring(0, iS), true);
}
if (iP != NP)
{
// we have not finished parsing
// now we start from a '*'
// we try to get a sequence of matches to ('*', non '*'s), ('*', non '*'s), ....
while (iS != NS)
{
if (pattern[iP] == '*')
{
// we have reached a new '*', we will now compare against the next pattern character
iP++;
if (iP == NP)
{
//we have matched all the pattern
break; // while
}
if (icP != iP)
{
// this is the 1st time we try to process this '*'
if (icP >= 0)
{
// not the first run
// so we have successfully processed the previous '*'
if (ioS1 != ioS2)
{
addChunkToStringMatch(res, source.Substring(ioS1, ioS2 - ioS1), false);
}
if (ioS2 != iS)
{
addChunkToStringMatch(res, source.Substring(ioS2, iS - ioS2), true);
}
}
ioS1 = iS;
ioS2 = -1;
}
// we save the current position in case the '*' needs to match more characters
icP = iP;
icS = iS + 1;
}
else if (lsource[iS] == pattern[iP])
{
// if we were processing a '*', we now have a successfull match
// we are still matching sucessfully the pattern
if (ioS2 == -1)
{
ioS2 = iS;
}
iS++;
iP++;
}
else
{
// we have a mismatch
// let's try again with '*' matching one more character
iP = icP;
iS = icS++;
}
if (iP == NP)
{
//we have matched all the pattern
break; // while
}
}
// we have processed either the whole source or either the whole pattern
// let's process any remaining '*' which here matches the empty string
while ((iP != NP) && (pattern[iP] == '*'))
{
iP++;
}
}
if (iP == NP)
{
// we have a match!
if (icP != iP)
{
if (ioS1 != -1)
{
if (ioS2 == -1)
{
addChunkToStringMatch(res, source.Substring(ioS1, iS - ioS1), false);
}
else
{
if (ioS2 != ioS1)
{
addChunkToStringMatch(res, source.Substring(ioS1, ioS2 - ioS1), false);
}
if (ioS2 != iS)
{
addChunkToStringMatch(res, source.Substring(ioS2, iS - ioS2), true);
}
}
}
}
if (iS != NS)
{
addChunkToStringMatch(res, source.Substring(iS, NS - iS), false);
}
return(res);
}
return(null);
}