Markdown Highlighter: more speed

src/hgmarkdownhighlighter.cpp

@@ -34,8 +34,8 @@ HGMarkdownHighlighter::HGMarkdownHighlighter(const QVector<HighlightingStyle> &s
       m_codeBlockStyles(codeBlockStyles),
       m_numOfCodeBlockHighlightsToRecv(0),
       parsing(0),
+      m_blockHLResultReady(false),
       waitInterval(waitInterval),
-      m_firstParse(true),
       content(NULL),
       capacity(0),
       result(NULL)
@@ -65,7 +65,10 @@ HGMarkdownHighlighter::HGMarkdownHighlighter(const QVector<HighlightingStyle> &s
     timer = new QTimer(this);
     timer->setSingleShot(true);
     timer->setInterval(this->waitInterval);
-    connect(timer, &QTimer::timeout, this, &HGMarkdownHighlighter::timerTimeout);
+    connect(timer, &QTimer::timeout,
+            this, [this]() {
+                startParseAndHighlight(false);
+            });
 
     static const int completeWaitTime = 500;
     m_completeTimer = new QTimer(this);
@@ -111,7 +114,7 @@ void HGMarkdownHighlighter::updateBlockUserData(int p_blockNum, const QString &p
 void HGMarkdownHighlighter::highlightBlock(const QString &text)
 {
     int blockNum = currentBlock().blockNumber();
-    if (!parsing && blockHighlights.size() > blockNum) {
+    if (m_blockHLResultReady && blockHighlights.size() > blockNum) {
         const QVector<HLUnit> &units = blockHighlights[blockNum];
         for (int i = 0; i < units.size(); ++i) {
             // TODO: merge two format within the same range
@@ -456,7 +459,7 @@ void HGMarkdownHighlighter::highlightLinkWithSpacesInURL(const QString &p_text)
     }
 }
 
-void HGMarkdownHighlighter::parse()
+void HGMarkdownHighlighter::parse(bool p_fast)
 {
     if (!parsing.testAndSetRelaxed(0, 1)) {
         return;
@@ -467,16 +470,22 @@ void HGMarkdownHighlighter::parse()
     }
 
     {
+    m_blockHLResultReady = false;
+
     int nrBlocks = document->blockCount();
     parseInternal();
 
     initBlockHighlightFromResult(nrBlocks);
 
-    initHtmlCommentRegionsFromResult();
+    m_blockHLResultReady = true;
 
-    initImageRegionsFromResult();
+    if (!p_fast) {
+        initHtmlCommentRegionsFromResult();
 
-    initHeaderRegionsFromResult();
+        initImageRegionsFromResult();
+
+        initHeaderRegionsFromResult();
+    }
 
     if (result) {
         pmh_free_elements(result);
@@ -524,25 +533,32 @@ void HGMarkdownHighlighter::handleContentChange(int /* position */, int charsRem
     timer->start();
 }
 
-void HGMarkdownHighlighter::timerTimeout()
+void HGMarkdownHighlighter::startParseAndHighlight(bool p_fast)
 {
-    qDebug() << "HGMarkdownHighlighter start a new parse";
-    parse();
-    if (!updateCodeBlocks() || m_firstParse) {
+    qDebug() << "HGMarkdownHighlighter start a new parse (fast" << p_fast << ")";
+    parse(p_fast);
+
+    if (p_fast) {
         rehighlight();
-    }
+    } else {
+        if (!updateCodeBlocks()) {
+            rehighlight();
+        }
 
-    highlightChanged();
-
-    if (m_firstParse) {
-        m_firstParse = false;
+        highlightChanged();
     }
 }
 
 void HGMarkdownHighlighter::updateHighlight()
 {
     timer->stop();
-    timerTimeout();
+    startParseAndHighlight(false);
+}
+
+void HGMarkdownHighlighter::updateHighlightFast()
+{
+    timer->stop();
+    startParseAndHighlight(true);
 }
 
 bool HGMarkdownHighlighter::updateCodeBlocks()

src/hgmarkdownhighlighter.h

@@ -128,6 +128,9 @@ public:
 
     void clearPossiblePreviewBlocks(const QVector<int> &p_blocksToClear);
 
+    // Parse and only update the highlight results for rehighlight().
+    void updateHighlightFast();
+
 signals:
     void highlightCompleted();
 
@@ -144,11 +147,14 @@ protected:
     void highlightBlock(const QString &text) Q_DECL_OVERRIDE;
 
 public slots:
+    // Parse and rehighlight immediately.
     void updateHighlight();
 
 private slots:
     void handleContentChange(int position, int charsRemoved, int charsAdded);
-    void timerTimeout();
+
+    // @p_fast: if true, just parse and update styles.
+    void startParseAndHighlight(bool p_fast = false);
 
 private:
     QRegExp codeBlockStartExp;
@@ -186,12 +192,13 @@ private:
     QTimer *m_completeTimer;
 
     QAtomicInt parsing;
+
+    // Whether highlight results for blocks are ready.
+    bool m_blockHLResultReady;
+
     QTimer *timer;
     int waitInterval;
 
-    // Whether this is the first parse.
-    bool m_firstParse;
-
     // Block number of those blocks which possible contains previewed image.
     QSet<int> m_possiblePreviewBlocks;
 
@@ -209,7 +216,8 @@ private:
     // intended to complement this.
     void highlightLinkWithSpacesInURL(const QString &p_text);
 
-    void parse();
+    void parse(bool p_fast = false);
+
     void parseInternal();
 
     // Init highlight elements for all the blocks from parse results.

src/vcodeblockhighlighthelper.cpp

@@ -8,8 +8,11 @@
 VCodeBlockHighlightHelper::VCodeBlockHighlightHelper(HGMarkdownHighlighter *p_highlighter,
                                                      VDocument *p_vdoc,
                                                      MarkdownConverterType p_type)
-    : QObject(p_highlighter), m_highlighter(p_highlighter), m_vdocument(p_vdoc),
-      m_type(p_type), m_timeStamp(0)
+    : QObject(p_highlighter),
+      m_highlighter(p_highlighter),
+      m_vdocument(p_vdoc),
+      m_type(p_type),
+      m_timeStamp(0)
 {
     connect(m_highlighter, &HGMarkdownHighlighter::codeBlocksUpdated,
             this, &VCodeBlockHighlightHelper::handleCodeBlocksUpdated);
@@ -56,6 +59,16 @@ QString VCodeBlockHighlightHelper::unindentCodeBlock(const QString &p_text)
 
 void VCodeBlockHighlightHelper::handleCodeBlocksUpdated(const QVector<VCodeBlock> &p_codeBlocks)
 {
+    if (!m_vdocument->isReadyToHighlight()) {
+        // Immediately return empty results.
+        QVector<HLUnitPos> emptyRes;
+        for (int i = 0; i < p_codeBlocks.size(); ++i) {
+            updateHighlightResults(0, emptyRes);
+        }
+
+        return;
+    }
+
     int curStamp = m_timeStamp.fetchAndAddRelaxed(1) + 1;
     m_codeBlocks = p_codeBlocks;
     for (int i = 0; i < m_codeBlocks.size(); ++i) {

src/vdocument.cpp

@@ -3,7 +3,9 @@
 #include <QDebug>
 
 VDocument::VDocument(const VFile *v_file, QObject *p_parent)
-    : QObject(p_parent), m_file(v_file)
+    : QObject(p_parent),
+      m_file(v_file),
+      m_readyToHighlight(false)
 {
 }
 
@@ -77,6 +79,7 @@ void VDocument::highlightTextCB(const QString &p_html, int p_id, int p_timeStamp
 
 void VDocument::noticeReadyToHighlightText()
 {
+    m_readyToHighlight = true;
     emit readyToHighlightText();
 }
 

src/vdocument.h

@@ -31,6 +31,8 @@ public:
 
     void setFile(const VFile *p_file);
 
+    bool isReadyToHighlight() const;
+
 public slots:
     // Will be called in the HTML side
 
@@ -82,6 +84,13 @@ private:
     QString m_html;
 
     const VFile *m_file;
+
+    // Whether the web side is ready to handle highlight text request.
+    bool m_readyToHighlight;
 };
 
+inline bool VDocument::isReadyToHighlight() const
+{
+    return m_readyToHighlight;
+}
 #endif // VDOCUMENT_H

src/vmdeditor.cpp

@@ -46,6 +46,8 @@ VMdEditor::VMdEditor(VFile *p_file,
             });
     // End.
 
+    setReadOnly(true);
+
     m_mdHighlighter = new HGMarkdownHighlighter(g_config->getMdHighlightingStyles(),
                                                 g_config->getCodeBlockStyles(),
                                                 g_config->getMarkdownHighlightInterval(),
@@ -110,7 +112,11 @@ void VMdEditor::beginEdit()
 
     emit statusChanged();
 
-    updateHeaders(m_mdHighlighter->getHeaderRegions());
+    if (m_freshEdit) {
+        m_mdHighlighter->updateHighlight();
+    } else {
+        updateHeaders(m_mdHighlighter->getHeaderRegions());
+    }
 }
 
 void VMdEditor::endEdit()
@@ -133,10 +139,17 @@ void VMdEditor::saveFile()
 
 void VMdEditor::reloadFile()
 {
+    bool readonly = isReadOnly();
+    setReadOnly(true);
+
     const QString &content = m_file->getContent();
     setPlainText(content);
-
     setModified(false);
+    m_mdHighlighter->updateHighlightFast();
+
+    m_freshEdit = true;
+
+    setReadOnly(readonly);
 }
 
 bool VMdEditor::scrollToBlock(int p_blockNumber)