private bool MatchAgainstDocText(string matchExpression, ScanPages scanPages, ref double matchFactorTotal, List<DocMatchingTextLoc> matchingTextLocs)
{
int curExpressionIdx = 0;
StringTok st = new StringTok(matchExpression);
return EvalMatch(matchExpression, st, scanPages, ref matchFactorTotal, ref curExpressionIdx, matchingTextLocs);
}
private bool EvalMatch(string matchExpression, StringTok st, ScanPages scanPages, ref double matchFactorTotal, ref int curExpressionIdx, List<DocMatchingTextLoc> matchingTextLocs)
{
bool result = false;
string token = "";
bool curOpIsOr = true;
bool opIsInverse = false;
DocRectangle docRectPercent = new DocRectangle(0, 0, 100, 100);
int docRectValIdx = 0;
double matchFactorForTerm = 0;
#if TEST_PERF_EVALMATCH
Stopwatch stopWatch1 = new Stopwatch();
stopWatch1.Start();
#endif
while((token = st.GetNextToken()) != null)
{
if (token.Trim() == "")
continue;
else if (token == ")")
return result;
else if (token == "(")
{
bool tmpRslt = EvalMatch(matchExpression, st, scanPages, ref matchFactorTotal, ref curExpressionIdx, matchingTextLocs);
if (opIsInverse)
tmpRslt = !tmpRslt;
if (curOpIsOr)
result |= tmpRslt;
else
result &= tmpRslt;
}
else if (token == "&")
curOpIsOr = false;
else if (token == "|")
curOpIsOr = true;
else if (token == "!")
opIsInverse = true;
else
{
// We've reached a terminal token (string to match to text in the document)
string stringToMatch = token;
// Check for matchFactor - must have some text before it
if (token == ":")
return result;
// See if there is a location defined by the next token
while ((st.PeekNextToken() != null) && (st.PeekNextToken() == ""))
st.GetNextToken();
if ((st.PeekNextToken() != null) && (st.PeekNextToken() == ":"))
{
matchFactorForTerm = 0;
st.GetNextToken();
while ((st.PeekNextToken() != null) && (st.PeekNextToken() == ""))
st.GetNextToken();
token = st.GetNextToken();
if (token != null)
Double.TryParse(token, out matchFactorForTerm);
}
// Check for location on empty string
if (token == "{")
return result;
// See if there is a location defined by the next token
while ((st.PeekNextToken() != null) && (st.PeekNextToken() == ""))
st.GetNextToken();
if ((st.PeekNextToken() != null) && (st.PeekNextToken() == "{"))
{
while ((token = st.GetNextToken()) != null)
{
if (token == "")
continue;
else if (token == "{")
docRectValIdx = 0;
else if (token == ",")
docRectValIdx++;
else if (token == "}")
break;
else
{
double rectVal = 0;
Double.TryParse(token, out rectVal);
docRectPercent.SetVal(docRectValIdx, rectVal);
}
}
}
// Process the match string using the location rectangle
// The check for curOpIsOr || result is to avoid unnecessary work if the expression is already false and we're doing a AND
if ((stringToMatch.Trim().Length >= 0) && (curOpIsOr || result))
{
bool tmpRslt = MatchString(stringToMatch, docRectPercent, scanPages, curExpressionIdx, matchingTextLocs);
if (opIsInverse)
tmpRslt = !tmpRslt;
if (curOpIsOr)
result |= tmpRslt;
else
result &= tmpRslt;
// Clear the inverse operator after 1 use
opIsInverse = false;
// Handle match factor
if (tmpRslt)
matchFactorTotal += matchFactorForTerm;
}
// Set the docRect to the entire page (ready for next term)
docRectPercent = new DocRectangle(0,0,100,100);
matchFactorForTerm = 0;
curExpressionIdx++;
}
}
#if TEST_PERF_EVALMATCH
stopWatch1.Stop();
logger.Info("EvalMatch : {0:0.00} uS, expr {1}", stopWatch1.ElapsedTicks * 1000000.0 / Stopwatch.Frequency, matchExpression);
#endif
return result;
}
