Albert S
bb1e653690
It was possible the text was getting too big. The GUI was lagging for previews of some text files. The first assumption was that we would only have a couple of hits, which is unreasonable for large .txt files and common words. We only ever see a handful of previews, it makes no sense to get all snippets. So just allow 7 snippets, that's it. Also, just cut after 1000 chars no matter what.
91 lines
2.1 KiB
C++
91 lines
2.1 KiB
C++
#include <QTextStream>
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#include "previewgeneratorplaintext.h"
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#include "previewresultplaintext.h"
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QSharedPointer<PreviewResult> PreviewGeneratorPlainText::generate(RenderConfig config, QString documentPath,
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unsigned int page)
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{
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PreviewResultPlainText *result = new PreviewResultPlainText(documentPath, page);
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QFile file(documentPath);
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if(!file.open(QFile::ReadOnly | QFile::Text))
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{
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return QSharedPointer<PreviewResultPlainText>(result);
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}
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QTextStream in(&file);
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QString resulText = "";
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QString content = in.readAll();
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QMap<int, QString> snippet;
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int coveredRange = 0;
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int lastWordPos = 0;
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QHash<QString, int> countmap;
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const unsigned int maxSnippets = 7;
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unsigned int currentSnippets = 0;
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for(QString &word : config.wordsToHighlight)
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{
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int lastPos = 0;
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int index = content.indexOf(word, lastPos, Qt::CaseInsensitive);
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while(index != -1 && currentSnippets < maxSnippets)
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{
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countmap[word] = countmap.value(word, 0) + 1;
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if(index >= lastWordPos && index <= coveredRange)
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{
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break;
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}
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int begin = index - 50;
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if(begin < 0)
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{
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begin = 0;
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}
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int after = index + 50;
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if(after > content.size())
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{
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after = content.size();
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}
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snippet[index] = "...<br>" + content.mid(begin, after) + "...<br>";
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coveredRange = after;
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lastPos = index;
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index = content.indexOf(word, lastPos + 1, Qt::CaseInsensitive);
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++currentSnippets;
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}
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lastWordPos = lastPos;
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}
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auto i = snippet.constBegin();
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while(i != snippet.constEnd())
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{
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resulText.append(i.value());
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++i;
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}
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for(QString &word : config.wordsToHighlight)
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{
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resulText.replace(word, "<span style=\"background-color: yellow;\">" + word + "</span>", Qt::CaseInsensitive);
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}
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QFileInfo info{documentPath};
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QString header = "<b>" + info.fileName() + "</b> ";
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for(QString &word : config.wordsToHighlight)
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{
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header += word + ": " + QString::number(countmap[word]) + " ";
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}
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if(currentSnippets == maxSnippets)
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{
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header += "(truncated)";
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}
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header += "<hr>";
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result->setText(header + resulText.replace("\n", "<br>").mid(0, 1000));
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return QSharedPointer<PreviewResultPlainText>(result);
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}
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