bool HistorySearch::search(int startColumn, int startLine, int endColumn, int endLine) {
qDebug() << "search from" << startColumn << "," << startLine
<< "to" << endColumn << "," << endLine;
int linesRead = 0;
int linesToRead = endLine - startLine + 1;
qDebug() << "linesToRead:" << linesToRead;
// We read process history from (and including) startLine to (and including) endLine in
// blocks of at most 10K lines so that we do not use unhealthy amounts of memory
int blockSize;
while ((blockSize = std::min(10000, linesToRead - linesRead)) > 0) {
QString string;
QTextStream searchStream(&string);
PlainTextDecoder decoder;
decoder.begin(&searchStream);
decoder.setRecordLinePositions(true);
// Calculate lines to read and read them
int blockStartLine = m_forwards ? startLine + linesRead : endLine - linesRead - blockSize + 1;
int chunkEndLine = blockStartLine + blockSize - 1;
m_emulation->writeToStream(&decoder, blockStartLine, chunkEndLine);
// We search between startColumn in the first line of the string and endColumn in the last
// line of the string. First we calculate the position (in the string) of endColumn in the
// last line of the string
int endPosition;
// The String that Emulator.writeToStream produces has a newline at the end, and so ends with an
// empty line - we ignore that.
int numberOfLinesInString = decoder.linePositions().size() - 1;
if (numberOfLinesInString > 0 && endColumn > -1 )
{
endPosition = decoder.linePositions().at(numberOfLinesInString - 1) + endColumn;
}
else
{
endPosition = string.size();
}
// So now we can log for m_regExp in the string between startColumn and endPosition
int matchStart;
if (m_forwards)
{
matchStart = string.indexOf(m_regExp, startColumn);
if (matchStart >= endPosition)
matchStart = -1;
}
else
{
matchStart = string.lastIndexOf(m_regExp, endPosition - 1);
if (matchStart < startColumn)
matchStart = -1;
}
if (matchStart > -1)
{
int matchEnd = matchStart + m_regExp.matchedLength() - 1;
qDebug() << "Found in string from" << matchStart << "to" << matchEnd;
// Translate startPos and endPos to startColum, startLine, endColumn and endLine in history.
int startLineNumberInString = findLineNumberInString(decoder.linePositions(), matchStart);
m_foundStartColumn = matchStart - decoder.linePositions().at(startLineNumberInString);
m_foundStartLine = startLineNumberInString + startLine + linesRead;
int endLineNumberInString = findLineNumberInString(decoder.linePositions(), matchEnd);
m_foundEndColumn = matchEnd - decoder.linePositions().at(endLineNumberInString);
m_foundEndLine = endLineNumberInString + startLine + linesRead;
qDebug() << "m_foundStartColumn" << m_foundStartColumn
<< "m_foundStartLine" << m_foundEndLine
<< "m_foundEndColumn" << m_foundEndColumn
<< "m_foundEndLine" << m_foundEndLine;
return true;
}
linesRead += blockSize;
}
qDebug() << "Not found";
return false;
}
vector<Page*>* QueryProcessor::process(int structure, string search)
{
bool is_not = false;
int not_pos = 0;
unsigned long length = 0;
vector<Page*> hold;
unordered_set<string>::const_iterator probe;
istringstream searchStream(search);
vector<string> tokens{istream_iterator<string>{searchStream},
istream_iterator<string>{}};
//Clear Results(reusable funct.)
processedResults->clear();
rawResults->clear();
//Remove Stop Words
for (int i = 0; i < tokens.size(); ++i)
{
probe = stopWords->find(tokens[i]);
if(probe != stopWords->end())
{
tokens.erase(tokens.begin()+i);
}
}
//Checking for NOT, Lowercase, & Stem
for (int i = 0; i < tokens.size(); ++i)
{
//cout << tokens[i] << endl;
if (tokens[i] == "NOT")
{
is_not = true;
not_pos = i;
}
transform(tokens[i].begin(), tokens[i].end(),
tokens[i].begin(), ::tolower);
Porter2Stemmer::stem(tokens[i]);
}
//Length of Search Terms
if(is_not)
{
length = tokens.size() - (tokens.size()-not_pos) - 1;
}
else if (tokens.size() > 1)
{
length = tokens.size()-1;
}
else if (tokens.size() == 1)
{
length = 0;
rawResults->push_back(index->getListOfPages(structure, tokens[0]));
}
//Length > 0, add to results
for(int i = 0; i < length; ++i)
{
rawResults->push_back(index->getListOfPages(structure, tokens[i+1]));
}
//Single Search Term
if(length == 0)
{
rawResults->push_back(index->getListOfPages(structure, tokens[0]));
length = 1;
}
//AND...
if( (tokens[0].compare("AND") == 0 || tokens[0].compare("and") == 0)
&& length >= 2 )
{
size_t size = 0;
vector<Page*> temp;
set_intersection(rawResults->operator[](0).begin(), rawResults->operator[](0).end(),
rawResults->operator[](1).begin(), rawResults->operator[](1).end(),
back_inserter(temp));
if(length > 2)
{
for (int i = 2; i < length; ++i)
{
size = temp.size();
set_intersection(temp.begin(), temp.end(),
rawResults->operator[](i).begin(), rawResults->operator[](i).end(),
back_inserter(temp));
vector<Page*> vec(temp.begin()+size, temp.begin()+temp.size());
sort(temp.begin(), temp.end());
*processedResults = vec;
}
}
else if(length == 2)
{
*processedResults = temp;
}
}
//OR...
else if(( tokens[0].compare("OR") == 0 || tokens[0].compare("or") == 0 ) && length >= 2)
{
vector<Page*> temp = rawResults->operator[](0);
for (int i = 1; i < length; ++i)
{
temp = merge_copy(temp, rawResults->operator[](i));
sort( temp.begin(), temp.end() );
temp.erase( unique( temp.begin(), temp.end() ), temp.end() );
}
*processedResults = temp;
}
//Single Term
else
{
*processedResults = rawResults->operator[](0);
}
//NOT...
if(is_not && tokens.size() >= 3)
{
size_t size = 0;
int notLength = 0;
vector<Page*> temp;
for(int i = not_pos + 1; i < tokens.size(); ++i, ++notLength)
{
rawResults->push_back(index->getListOfPages(structure, tokens[i]));
}
set_difference(processedResults->begin(), processedResults->end(),
rawResults->operator[](length).begin(),
rawResults->operator[](length).end(),
back_inserter(temp) );
if(notLength > 1)
{
for (int i = 1; i < notLength; ++i)
{
size = (size_t)temp.size();
set_difference(temp.begin(), temp.end(),
rawResults->operator[](length+i).begin(),
rawResults->operator[](length+i).end(),
back_inserter(temp));
vector<Page*> vec(temp.begin()+size, temp.begin()+temp.size());
temp = vec;
sort(temp.begin(), temp.end());
*processedResults = vec;
}
}
else
{
*processedResults = temp;
}
}
//Calculate Relevancy
relevancy->clear();
relevancy->reserve(processedResults->size());
for(int i = 0; i < processedResults->size(); ++i)
{
int temp = 0;
if(tokens[0] == "and" || tokens[0] == "or")
{
for (int j = 0; j < length ; ++j)
{
temp += processedResults->operator[](i)->getCount(tokens[j+1]);
}
}
else
{
temp += processedResults->operator[](i)->getCount(tokens[0]);
}
relevancy->operator[](i) = temp;
}
//Sorting Results(relevancy)
int pos_min,temp;
Page* temp2;
if (processedResults->size() > 1)
{
//Selection Sort: http://cforbeginners.com/ssort.html
for (int i=0; i < processedResults->size()-1; i++)
{
pos_min = i;//set pos_min to the current index of array
for (int j=i+1; j < processedResults->size(); j++)
{
if (relevancy->operator[](j) > relevancy->operator[](pos_min))
pos_min=j;
//pos_min will keep track of the index that min is in, this is needed when a swap happens
}
//if pos_min no longer equals i than a smaller value must have been found, so a swap must occur
if (pos_min != i)
{
temp = relevancy->operator[](i);
temp2 = processedResults->operator[](i);
relevancy->operator[](i) = relevancy->operator[](pos_min);
processedResults->operator[](i) = processedResults->operator[](pos_min);
relevancy->operator[](pos_min) = temp;
processedResults->operator[](pos_min) = temp2;
}
}
}
return processedResults;
}
