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LanguageClient: Merge adjacent change events

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This saves a lot of data going over the wire.

Change-Id: Iac1220c72797643ba09bf90b02f7b5155cda4b0f
Reviewed-by: David Schulz <david.schulz@qt.io>
This commit is contained in:
Christian Kandeler
2021-09-13 17:40:41 +02:00
parent 719f51445e
commit 268f4ac406
1 changed files with 35 additions and 16 deletions
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51
src/plugins/languageclient/client.cpp
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@@ -698,22 +698,41 @@ void Client::documentContentsChanged(TextEditor::TextDocument *document,
if (syncKind != TextDocumentSyncKind::None) {
if (syncKind == TextDocumentSyncKind::Incremental) {
DidChangeTextDocumentParams::TextDocumentContentChangeEvent change;
QTextDocument oldDoc(m_openedDocument[document]);
QTextCursor cursor(&oldDoc);
// Workaround https://bugreports.qt.io/browse/QTBUG-80662
// The contentsChanged gives a character count that can be wrong for QTextCursor
// when there are special characters removed/added (like formating characters).
// Also, characterCount return the number of characters + 1 because of the hidden
// paragraph separator character.
// This implementation is based on QWidgetTextControlPrivate::_q_contentsChanged.
// For charsAdded, textAt handles the case itself.
cursor.setPosition(qMin(oldDoc.characterCount() - 1, position + charsRemoved));
cursor.setPosition(position, QTextCursor::KeepAnchor);
change.setRange(Range(cursor));
change.setRangeLength(cursor.selectionEnd() - cursor.selectionStart());
change.setText(document->textAt(position, charsAdded));
m_documentsToUpdate[document] << change;
// If the new change is a pure insertion and its range is adjacent to the range of the
// previous change, we can trivially merge the two changes.
// For the typical case of the user typing a continuous sequence of characters,
// this will save a lot of TextDocumentContentChangeEvent elements in the data stream,
// as otherwise we'd send tons of single-character changes.
const QString &text = document->textAt(position, charsAdded);
auto &queue = m_documentsToUpdate[document];
bool append = true;
if (!queue.isEmpty() && charsRemoved == 0) {
auto &prev = queue.last();
const int prevStart = prev.range()->start()
.toPositionInDocument(document->document());
if (prevStart + prev.text().length() == position) {
prev.setText(prev.text() + text);
append = false;
}
}
if (append) {
QTextDocument oldDoc(m_openedDocument[document]);
QTextCursor cursor(&oldDoc);
// Workaround https://bugreports.qt.io/browse/QTBUG-80662
// The contentsChanged gives a character count that can be wrong for QTextCursor
// when there are special characters removed/added (like formating characters).
// Also, characterCount return the number of characters + 1 because of the hidden
// paragraph separator character.
// This implementation is based on QWidgetTextControlPrivate::_q_contentsChanged.
// For charsAdded, textAt handles the case itself.
cursor.setPosition(qMin(oldDoc.characterCount() - 1, position + charsRemoved));
cursor.setPosition(position, QTextCursor::KeepAnchor);
DidChangeTextDocumentParams::TextDocumentContentChangeEvent change;
change.setRange(Range(cursor));
change.setRangeLength(cursor.selectionEnd() - cursor.selectionStart());
change.setText(text);
queue << change;
}
} else {
m_documentsToUpdate[document] = {
DidChangeTextDocumentParams::TextDocumentContentChangeEvent(document->plainText())};