Editor: reduce complexity of TextDocumentManipulator

Move implementations either to the TextEditorWidget, TextDocument, or to
the caller side. This makes the TextDocumentManipulator basically a
repeater so we can easily replace it with a TextEditorWidget in the
next step.

Change-Id: I04de3cb295b56fbaae99145f8e579fe405b065a5
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/clangcodemodel/clangdcompletion.cpp

@@ -288,7 +288,7 @@ void ClangdCompletionItem::apply(TextDocumentManipulator &manipulator,
     int cursorOffset = 0;
     bool setAutoCompleteSkipPos = false;
     int currentPos = manipulator.currentPosition();
-    const QTextDocument * const doc = manipulator.textCursorAt(currentPos).document();
+    const QTextDocument * const doc = manipulator.document();
     const Range range = edit->range();
     const int rangeStart = range.start().toPositionInDocument(doc);
     if (isFunctionLike && completionSettings.m_autoInsertBrackets) {
@@ -383,13 +383,14 @@ void ClangdCompletionItem::apply(TextDocumentManipulator &manipulator,
 
     textToBeInserted += extraCharacters;
     const int length = currentPos - rangeStart + extraLength;
-    const bool isReplaced = manipulator.replace(rangeStart, length, textToBeInserted);
+    const int oldRevision = manipulator.document()->revision();
+    manipulator.replace(rangeStart, length, textToBeInserted);
     manipulator.setCursorPosition(rangeStart + textToBeInserted.length());
-    if (isReplaced) {
+    if (manipulator.document()->revision() != oldRevision) {
         if (cursorOffset)
             manipulator.setCursorPosition(manipulator.currentPosition() + cursorOffset);
         if (setAutoCompleteSkipPos)
-            manipulator.setAutoCompleteSkipPosition(manipulator.currentPosition());
+            manipulator.addAutoCompleteSkipPosition();
     }
 
     if (auto additionalEdits = item.additionalTextEdits()) {

src/plugins/clangcodemodel/clangpreprocessorassistproposalitem.cpp

@@ -51,8 +51,9 @@ void ClangPreprocessorAssistProposalItem::apply(TextEditor::TextDocumentManipula
         extraCharacters += m_typedCharacter;
 
     // Avoid inserting characters that are already there
-    const int endsPosition = manipulator.positionAt(TextEditor::EndOfLinePosition);
-    const QString existingText = manipulator.textAt(manipulator.currentPosition(), endsPosition - manipulator.currentPosition());
+    QTextCursor c = manipulator.textCursor();
+    c.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
+    const QString existingText = c.selectedText();
     int existLength = 0;
     if (!existingText.isEmpty()) {
         // Calculate the exist length in front of the extra chars

src/plugins/clangcodemodel/test/clangdtests.cpp

@@ -1659,7 +1659,7 @@ void ClangdTestCompletion::testCompleteGlobals()
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(7), "   globalFunction() /* COMPLETE HERE */");
     QCOMPARE(manipulator.cursorPos(), Text::Position({7, 19}));
-    QCOMPARE(manipulator.skipPos(), -1);
+    QVERIFY(manipulator.editor()->autoCompleteHighlightPositions().isEmpty());
 }
 
 void ClangdTestCompletion::testCompleteMembers()
@@ -1679,7 +1679,7 @@ void ClangdTestCompletion::testCompleteMembers()
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(7), "    s.member /* COMPLETE HERE */");
     QCOMPARE(manipulator.cursorPos(), Text::Position({7, 12}));
-    QCOMPARE(manipulator.skipPos(), -1);
+    QVERIFY(manipulator.editor()->autoCompleteHighlightPositions().isEmpty());
 }
 
 void ClangdTestCompletion::testCompleteMembersFromInside()
@@ -1697,7 +1697,7 @@ void ClangdTestCompletion::testCompleteMembersFromInside()
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(4), "        privateFunc() /* COMPLETE HERE */");
     QCOMPARE(manipulator.cursorPos(), Text::Position({4, 21}));
-    QCOMPARE(manipulator.skipPos(), -1);
+    QVERIFY(manipulator.editor()->autoCompleteHighlightPositions().isEmpty());
 }
 
 void ClangdTestCompletion::testCompleteMembersFromOutside()
@@ -1715,7 +1715,7 @@ void ClangdTestCompletion::testCompleteMembersFromOutside()
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(13), "    c.publicFunc() /* COMPLETE HERE */");
     QCOMPARE(manipulator.cursorPos(), Text::Position({13, 18}));
-    QCOMPARE(manipulator.skipPos(), -1);
+    QVERIFY(manipulator.editor()->autoCompleteHighlightPositions().isEmpty());
 }
 
 void ClangdTestCompletion::testCompleteMembersFromFriend()
@@ -1733,7 +1733,7 @@ void ClangdTestCompletion::testCompleteMembersFromFriend()
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(14), "    C().privateFunc() /* COMPLETE HERE */");
     QCOMPARE(manipulator.cursorPos(), Text::Position({14, 21}));
-    QCOMPARE(manipulator.skipPos(), -1);
+    QVERIFY(manipulator.editor()->autoCompleteHighlightPositions().isEmpty());
 }
 
 void ClangdTestCompletion::testFunctionAddress()
@@ -1750,7 +1750,7 @@ void ClangdTestCompletion::testFunctionAddress()
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(7), "    const auto p = &S::memberFunc /* COMPLETE HERE */;");
     QCOMPARE(manipulator.cursorPos(), Text::Position({7, 33}));
-    QCOMPARE(manipulator.skipPos(), -1);
+    QVERIFY(manipulator.editor()->autoCompleteHighlightPositions().isEmpty());
 }
 
 void ClangdTestCompletion::testFunctionHints()
@@ -1814,7 +1814,7 @@ void ClangdTestCompletion::testCompleteClassAndConstructor()
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(7), "    Foo( /* COMPLETE HERE */");
     QCOMPARE(manipulator.cursorPos(), Text::Position({7, 8}));
-    QCOMPARE(manipulator.skipPos(), -1);
+    QVERIFY(manipulator.editor()->autoCompleteHighlightPositions().isEmpty());
 }
 
 void ClangdTestCompletion::testCompletePrivateFunctionDefinition()
@@ -1841,7 +1841,7 @@ void ClangdTestCompletion::testCompleteWithDotToArrowCorrection()
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(4), "    bar->member /* COMPLETE HERE */");
     QCOMPARE(manipulator.cursorPos(), Text::Position({4, 15}));
-    QCOMPARE(manipulator.skipPos(), -1);
+    QVERIFY(manipulator.editor()->autoCompleteHighlightPositions().isEmpty());
 }
 
 void ClangdTestCompletion::testDontCompleteWithDotToArrowCorrectionForFloats()
@@ -1872,7 +1872,7 @@ void ClangdTestCompletion::testCompleteCodeInGeneratedUiFile()
     item->apply(manipulator, cursorPos);
     QCOMPARE(manipulator.getLine(34), "    ui->setupUi( /* COMPLETE HERE */");
     QCOMPARE(manipulator.cursorPos(), Text::Position({34, 16}));
-    QCOMPARE(manipulator.skipPos(), -1);
+    QVERIFY(manipulator.editor()->autoCompleteHighlightPositions().isEmpty());
 }
 
 void ClangdTestCompletion::testSignalCompletion_data()

src/plugins/cppeditor/cppcompletionassist.cpp

@@ -322,7 +322,7 @@ void CppAssistProposalItem::applyContextualContent(TextDocumentManipulator &mani
     if (cursorOffset)
         manipulator.setCursorPosition(manipulator.currentPosition() + cursorOffset);
     if (setAutoCompleteSkipPos)
-        manipulator.setAutoCompleteSkipPosition(manipulator.currentPosition());
+        manipulator.addAutoCompleteSkipPosition();
 }
 
 // --------------------

src/plugins/languageclient/languageclientutils.cpp

@@ -105,7 +105,7 @@ void applyTextEdit(TextDocumentManipulator &manipulator,
                    bool newTextIsSnippet)
 {
     const Range range = edit.range();
-    const QTextDocument *doc = manipulator.textCursorAt(manipulator.currentPosition()).document();
+    const QTextDocument *doc = manipulator.document();
     const int start = Text::positionInText(doc, range.start().line() + 1, range.start().character() + 1);
     const int end = Text::positionInText(doc, range.end().line() + 1, range.end().character() + 1);
     if (newTextIsSnippet) {

src/plugins/qmljseditor/qmljscompletionassist.cpp

@@ -388,7 +388,7 @@ void QmlJSAssistProposalItem::applyContextualContent(TextEditor::TextDocumentMan
     manipulator.replace(basePosition, length, content);
     if (cursorOffset) {
         manipulator.setCursorPosition(manipulator.currentPosition() + cursorOffset);
-        manipulator.setAutoCompleteSkipPosition(manipulator.currentPosition());
+        manipulator.addAutoCompleteSkipPosition();
     }
 }
 

src/plugins/texteditor/circularclipboardassist.cpp

@@ -51,7 +51,7 @@ public:
                     TextEditorWidget::duplicateMimeData(m_mimeData.get()));
 
         //Paste
-        manipulator.paste();
+        manipulator.editor()->paste();
     }
 
 private:

src/plugins/texteditor/codeassist/assistproposalitem.cpp

@@ -113,7 +113,7 @@ void AssistProposalItem::apply(TextDocumentManipulator &manipulator, int basePos
         applyQuickFix(manipulator, basePosition);
     } else {
         applyContextualContent(manipulator, basePosition);
-        manipulator.encourageApply();
+        manipulator.editor()->encourageApply();
     }
 }
 

src/plugins/texteditor/codeassist/keywordscompletionassist.cpp

@@ -111,7 +111,7 @@ void KeywordsAssistProposalItem::applyContextualContent(TextDocumentManipulator
     if (cursorOffset)
         manipulator.setCursorPosition(manipulator.currentPosition() + cursorOffset);
     if (setAutoCompleteSkipPosition)
-        manipulator.setAutoCompleteSkipPosition(manipulator.currentPosition());
+        manipulator.addAutoCompleteSkipPosition();
 }
 
 // -------------------------

src/plugins/texteditor/codeassist/textdocumentmanipulator.cpp

@@ -18,11 +18,6 @@ int TextDocumentManipulator::currentPosition() const
     return m_textEditorWidget->position();
 }
 
-int TextDocumentManipulator::positionAt(TextPositionOperation textPositionOperation) const
-{
-    return m_textEditorWidget->position(textPositionOperation);
-}
-
 QChar TextDocumentManipulator::characterAt(int position) const
 {
     return m_textEditorWidget->characterAt(position);
@@ -33,12 +28,24 @@ QString TextDocumentManipulator::textAt(int position, int length) const
     return m_textEditorWidget->textAt(position, length);
 }
 
+QTextCursor TextDocumentManipulator::textCursor() const
+{
+    return m_textEditorWidget->textCursor();
+}
+
 QTextCursor TextDocumentManipulator::textCursorAt(int position) const
 {
-    auto cursor = m_textEditorWidget->textCursor();
-    cursor.setPosition(position);
+    return m_textEditorWidget->textCursorAt(position);
+}
 
-    return cursor;
+QTextDocument *TextDocumentManipulator::document() const
+{
+    return m_textEditorWidget->document();
+}
+
+TextEditorWidget *TextDocumentManipulator::editor() const
+{
+    return m_textEditorWidget;
 }
 
 void TextDocumentManipulator::setCursorPosition(int position)
@@ -46,101 +53,31 @@ void TextDocumentManipulator::setCursorPosition(int position)
     m_textEditorWidget->setCursorPosition(position);
 }
 
-void TextDocumentManipulator::setAutoCompleteSkipPosition(int position)
+void TextDocumentManipulator::addAutoCompleteSkipPosition()
 {
-    QTextCursor cursor = m_textEditorWidget->textCursor();
-    cursor.setPosition(position);
-    m_textEditorWidget->setAutoCompleteSkipPosition(cursor);
+    m_textEditorWidget->setAutoCompleteSkipPosition(m_textEditorWidget->textCursor());
 }
 
-bool TextDocumentManipulator::replace(int position, int length, const QString &text)
+void TextDocumentManipulator::replace(int position, int length, const QString &text)
 {
-    bool textWillBeReplaced = textIsDifferentAt(position, length, text);
-
-    if (textWillBeReplaced)
-        replaceWithoutCheck(position, length, text);
-
-    return textWillBeReplaced;
+    m_textEditorWidget->replace(position, length, text);
 }
 
 void TextDocumentManipulator::insertCodeSnippet(int position,
                                                 const QString &text,
                                                 const SnippetParser &parse)
 {
-    auto cursor = m_textEditorWidget->textCursor();
-    cursor.setPosition(position, QTextCursor::KeepAnchor);
-    m_textEditorWidget->insertCodeSnippet(cursor, text, parse);
-}
-
-void TextDocumentManipulator::paste()
-{
-    m_textEditorWidget->paste();
-}
-
-void TextDocumentManipulator::encourageApply()
-{
-    m_textEditorWidget->encourageApply();
-}
-
-namespace {
-
-bool hasOnlyBlanksBeforeCursorInLine(QTextCursor textCursor)
-{
-    textCursor.movePosition(QTextCursor::StartOfLine, QTextCursor::KeepAnchor);
-
-    const auto textBeforeCursor = textCursor.selectedText();
-
-    const auto nonSpace = std::find_if(textBeforeCursor.cbegin(),
-                                       textBeforeCursor.cend(),
-                                       [] (const QChar &signBeforeCursor) {
-        return !signBeforeCursor.isSpace();
-    });
-
-    return nonSpace == textBeforeCursor.cend();
-}
-
-}
-
-void TextDocumentManipulator::autoIndent(int position, int length)
-{
-    auto cursor = m_textEditorWidget->textCursor();
-    cursor.setPosition(position);
-    if (hasOnlyBlanksBeforeCursorInLine(cursor)) {
-        cursor.setPosition(position + length, QTextCursor::KeepAnchor);
-
-        m_textEditorWidget->textDocument()->autoIndent(cursor);
-    }
+    m_textEditorWidget->insertCodeSnippet(position, text, parse);
 }
 
 QString TextDocumentManipulator::getLine(int line) const
 {
-    return m_textEditorWidget->document()->findBlockByNumber(line - 1).text();
+    return m_textEditorWidget->textDocument()->blockText(line - 1);
 }
 
 Utils::Text::Position TextDocumentManipulator::cursorPos() const
 {
-    return Utils::Text::Position::fromCursor(m_textEditorWidget->textCursor());
-}
-
-int TextDocumentManipulator::skipPos() const
-{
-    const QList<QTextCursor> highlights = m_textEditorWidget->autoCompleteHighlightPositions();
-    return highlights.isEmpty() ? -1 : highlights.first().position();
-}
-
-bool TextDocumentManipulator::textIsDifferentAt(int position, int length, const QString &text) const
-{
-    const auto textToBeReplaced = m_textEditorWidget->textAt(position, length);
-
-    return text != textToBeReplaced;
-}
-
-void TextDocumentManipulator::replaceWithoutCheck(int position, int length, const QString &text)
-{
-    auto cursor = m_textEditorWidget->textCursor();
-    cursor.setPosition(position);
-    cursor.setPosition(position + length, QTextCursor::KeepAnchor);
-    cursor.insertText(text);
+    return m_textEditorWidget->lineColumn();
 }
 
 } // namespace TextEditor

src/plugins/texteditor/codeassist/textdocumentmanipulator.h

@@ -24,25 +24,22 @@ public:
     TextDocumentManipulator(TextEditorWidget *textEditorWidget);
 
     int currentPosition() const;
-    int positionAt(TextPositionOperation textPositionOperation) const;
     QChar characterAt(int position) const;
     QString textAt(int position, int length) const;
+    QTextCursor textCursor() const;
     QTextCursor textCursorAt(int position) const;
+    QTextDocument *document() const;
+    TextEditorWidget *editor() const;
 
     void setCursorPosition(int position);
-    void setAutoCompleteSkipPosition(int position);
-    bool replace(int position, int length, const QString &text);
+    void addAutoCompleteSkipPosition();
+    void replace(int position, int length, const QString &text);
     void insertCodeSnippet(int position, const QString &text, const SnippetParser &parse);
-    void paste();
-    void encourageApply();
-    void autoIndent(int position, int length);
 
     QString getLine(int line) const;
 
     Utils::Text::Position cursorPos() const;
 
-    int skipPos() const;
-
 private:
     bool textIsDifferentAt(int position, int length, const QString &text) const;
     void replaceWithoutCheck(int position, int length, const QString &text);

src/plugins/texteditor/textdocument.cpp

@@ -340,6 +340,11 @@ QChar TextDocument::characterAt(int pos) const
     return document()->characterAt(pos);
 }
 
+QString TextDocument::blockText(int blockNumber) const
+{
+    return document()->findBlockByNumber(blockNumber).text();
+}
+
 void TextDocument::setTypingSettings(const TypingSettings &typingSettings)
 {
     d->m_typingSettings = typingSettings;

src/plugins/texteditor/textdocument.h

@@ -59,6 +59,7 @@ public:
     virtual QString plainText() const;
     virtual QString textAt(int pos, int length) const;
     virtual QChar characterAt(int pos) const;
+    QString blockText(int blockNumber) const;
 
     void setTypingSettings(const TypingSettings &typingSettings);
     void setStorageSettings(const StorageSettings &storageSettings);

src/plugins/texteditor/texteditor.cpp

@@ -3226,7 +3226,7 @@ public:
     QTextCursor cursor;
 };
 
-void TextEditorWidget::insertCodeSnippet(const QTextCursor &cursor_arg,
+void TextEditorWidget::insertCodeSnippet(int basePosition,
                                          const QString &snippet,
                                          const SnippetParser &parse)
 {
@@ -3239,7 +3239,8 @@ void TextEditorWidget::insertCodeSnippet(const QTextCursor &cursor_arg,
     QTC_ASSERT(std::holds_alternative<ParsedSnippet>(result), return);
     ParsedSnippet data = std::get<ParsedSnippet>(result);
 
-    QTextCursor cursor = cursor_arg;
+    QTextCursor cursor = textCursor();
+    cursor.setPosition(basePosition, QTextCursor::KeepAnchor);
     cursor.beginEditBlock();
     cursor.removeSelectedText();
     const int startCursorPosition = cursor.position();
@@ -3433,6 +3434,18 @@ int TextEditorWidget::position(TextPositionOperation posOp, int at) const
     return -1;
 }
 
+QTextCursor TextEditorWidget::textCursorAt(int position) const
+{
+    QTextCursor c = textCursor();
+    c.setPosition(position);
+    return c;
+}
+
+Text::Position TextEditorWidget::lineColumn() const
+{
+    return Utils::Text::Position::fromCursor(textCursor());
+}
+
 QRect TextEditorWidget::cursorRect(int pos) const
 {
     QTextCursor tc = textCursor();
@@ -9583,6 +9596,22 @@ void TextEditorWidget::replace(int length, const QString &string)
     tc.insertText(string);
 }
 
+void TextEditorWidget::replace(int pos, int length, const QString &string)
+{
+    if (length == string.length()) {
+        bool different = false;
+        for (int i = 0; !different && pos < length; ++i)
+            different = document()->characterAt(pos) != string.at(i);
+        if (!different)
+            return;
+    }
+
+    QTextCursor tc = textCursor();
+    tc.setPosition(pos);
+    tc.setPosition(pos + length, QTextCursor::KeepAnchor);
+    tc.insertText(string);
+}
+
 void BaseTextEditor::setCursorPosition(int pos)
 {
     editorWidget()->setCursorPosition(pos);

src/plugins/texteditor/texteditor.h

@@ -18,6 +18,7 @@
 #include <utils/elidinglabel.h>
 #include <utils/link.h>
 #include <utils/multitextcursor.h>
+#include <utils/textutils.h>
 #include <utils/uncommentselection.h>
 
 #include <QPlainTextEdit>
@@ -196,6 +197,8 @@ public:
     void gotoLine(int line, int column = 0, bool centerLine = true, bool animate = false);
     int position(TextPositionOperation posOp = CurrentPosition,
          int at = -1) const;
+    QTextCursor textCursorAt(int position) const;
+    Utils::Text::Position lineColumn() const;
     void convertPosition(int pos, int *line, int *column) const;
     using QPlainTextEdit::cursorRect;
     QRect cursorRect(int pos) const;
@@ -268,7 +271,9 @@ public:
 
     void setReadOnly(bool b);
 
-    void insertCodeSnippet(const QTextCursor &cursor,
+    // replaces the text from the current cursor position to the base position with the snippet
+    // and starts the snippet replacement mode
+    void insertCodeSnippet(int basePosition,
                            const QString &snippet,
                            const SnippetParser &parse);
 
@@ -609,6 +614,7 @@ public:
 
     void remove(int length);
     void replace(int length, const QString &string);
+    void replace(int pos, int length, const QString &string);
     QChar characterAt(int pos) const;
     QString textAt(int from, int to) const;