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/*
Copyright 2013 Christian Surlykke
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
*/
#include <QApplication>
#include <QTextStream>
#include <QDebug>
#include "TerminalCharacterDecoder.h"
#include "Emulation.h"
#include "HistorySearch.h"
HistorySearch::HistorySearch(EmulationPtr emulation, const QRegExp& regExp,
bool forwards, int startColumn, int startLine,
QObject* parent) :
QObject(parent),
m_emulation(emulation),
m_regExp(regExp),
m_forwards(forwards),
m_startColumn(startColumn),
m_startLine(startLine) {
}
HistorySearch::~HistorySearch() {
}
void HistorySearch::search() {
bool found = false;
if (! m_regExp.isEmpty())
{
if (m_forwards) {
found = search(m_startColumn, m_startLine, -1, m_emulation->lineCount()) || search(0, 0, m_startColumn, m_startLine);
} else {
found = search(0, 0, m_startColumn, m_startLine) || search(m_startColumn, m_startLine, -1, m_emulation->lineCount());
}
if (found) {
emit matchFound(m_foundStartColumn, m_foundStartLine, m_foundEndColumn, m_foundEndLine);
}
else {
emit noMatchFound();
}
}
deleteLater();
}
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 = qMin(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;
}
int HistorySearch::findLineNumberInString(QList<int> linePositions, int position) {
int lineNum = 0;
while (lineNum + 1 < linePositions.size() && linePositions[lineNum + 1] <= position)
lineNum++;
return lineNum;
}
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