Editors: Refactor auto-complete code out of the editors for better reusability.

Reviewed-by: Thorbjorn Lindeijer

src/plugins/cppeditor/cppautocompleter.cpp

+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#include "cppautocompleter.h"
+
+#include <Token.h>
+
+#include <cplusplus/SimpleLexer.h>
+#include <cplusplus/MatchingText.h>
+#include <cplusplus/BackwardsScanner.h>
+
+#include <QtCore/QLatin1Char>
+#include <QtGui/QTextCursor>
+
+using namespace CppEditor;
+using namespace Internal;
+using namespace CPlusPlus;
+
+CppAutoCompleter::CppAutoCompleter()
+{}
+
+CppAutoCompleter::~CppAutoCompleter()
+{}
+
+bool CppAutoCompleter::doContextAllowsAutoParentheses(const QTextCursor &cursor,
+                                                      const QString &textToInsert) const
+{
+    QChar ch;
+
+    if (! textToInsert.isEmpty())
+        ch = textToInsert.at(0);
+
+    if (! (MatchingText::shouldInsertMatchingText(cursor)
+           || ch == QLatin1Char('\'')
+           || ch == QLatin1Char('"')))
+        return false;
+    else if (isInComment(cursor))
+        return false;
+
+    return true;
+}
+
+bool CppAutoCompleter::doContextAllowsElectricCharacters(const QTextCursor &cursor) const
+{
+    const Token tk = SimpleLexer::tokenAt(cursor.block().text(), cursor.positionInBlock(),
+                                          BackwardsScanner::previousBlockState(cursor.block()));
+
+    // XXX Duplicated from CPPEditor::isInComment to avoid tokenizing twice
+    if (tk.isComment()) {
+        const unsigned pos = cursor.selectionEnd() - cursor.block().position();
+
+        if (pos == tk.end()) {
+            if (tk.is(T_CPP_COMMENT) || tk.is(T_CPP_DOXY_COMMENT))
+                return false;
+
+            const int state = cursor.block().userState() & 0xFF;
+            if (state > 0)
+                return false;
+        }
+
+        if (pos < tk.end())
+            return false;
+    }
+    else if (tk.is(T_STRING_LITERAL) || tk.is(T_WIDE_STRING_LITERAL)
+        || tk.is(T_CHAR_LITERAL) || tk.is(T_WIDE_CHAR_LITERAL)) {
+
+        const unsigned pos = cursor.selectionEnd() - cursor.block().position();
+        if (pos <= tk.end())
+            return false;
+    }
+
+    return true;
+}
+
+bool CppAutoCompleter::doIsInComment(const QTextCursor &cursor) const
+{
+    const Token tk = SimpleLexer::tokenAt(cursor.block().text(), cursor.positionInBlock(),
+                                          BackwardsScanner::previousBlockState(cursor.block()));
+
+    if (tk.isComment()) {
+        const unsigned pos = cursor.selectionEnd() - cursor.block().position();
+
+        if (pos == tk.end()) {
+            if (tk.is(T_CPP_COMMENT) || tk.is(T_CPP_DOXY_COMMENT))
+                return true;
+
+            const int state = cursor.block().userState() & 0xFF;
+            if (state > 0)
+                return true;
+        }
+
+        if (pos < tk.end())
+            return true;
+    }
+
+    return false;
+}
+
+QString CppAutoCompleter::doInsertMatchingBrace(const QTextCursor &cursor,
+                                                const QString &text,
+                                                QChar la,
+                                                int *skippedChars) const
+{
+    MatchingText m;
+    return m.insertMatchingBrace(cursor, text, la, skippedChars);
+}
+
+QString CppAutoCompleter::doInsertParagraphSeparator(const QTextCursor &cursor) const
+{
+    MatchingText m;
+    return m.insertParagraphSeparator(cursor);
+}

src/plugins/cppeditor/cppautocompleter.h

+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#ifndef CPPAUTOCOMPLETER_H
+#define CPPAUTOCOMPLETER_H
+
+#include <texteditor/autocompleter.h>
+
+namespace CppEditor {
+namespace Internal {
+
+class CppAutoCompleter : public TextEditor::AutoCompleter
+{
+public:
+    CppAutoCompleter();
+    virtual ~CppAutoCompleter();
+
+private:
+    virtual bool doContextAllowsAutoParentheses(const QTextCursor &cursor,
+                                                const QString &textToInsert = QString()) const;
+    virtual bool doContextAllowsElectricCharacters(const QTextCursor &cursor) const;
+    virtual bool doIsInComment(const QTextCursor &cursor) const;
+    virtual QString doInsertMatchingBrace(const QTextCursor &cursor,
+                                          const QString &text,
+                                          QChar la,
+                                          int *skippedChars) const;
+    virtual QString doInsertParagraphSeparator(const QTextCursor &cursor) const;
+};
+
+} // Internal
+} // CppEditor
+
+#endif // CPPAUTOCOMPLETER_H

src/plugins/cppeditor/cppeditor.cpp

@@ -36,6 +36,7 @@
 #include "cpplocalsymbols.h"
 #include "cppquickfixcollector.h"
 #include "cppqtstyleindenter.h"
+#include "cppautocompleter.h"
 
 #include <AST.h>
 #include <Control.h>
@@ -416,6 +417,7 @@ CPPEditor::CPPEditor(QWidget *parent)
     setCodeFoldingSupported(true);
     setCodeFoldingVisible(true);
     setIndenter(new CppQtStyleIndenter);
+    setAutoCompleter(new CppAutoCompleter);
     baseTextDocument()->setSyntaxHighlighter(new CppHighlighter);
 
     m_modelManager = CppTools::CppModelManagerInterface::instance();
@@ -1407,90 +1409,6 @@ QModelIndex CPPEditor::outlineModelIndex()
     return m_outlineModelIndex;
 }
 
-QString CPPEditor::insertMatchingBrace(const QTextCursor &tc, const QString &text,
-                                       QChar la, int *skippedChars) const
-{
-    MatchingText m;
-    return m.insertMatchingBrace(tc, text, la, skippedChars);
-}
-
-QString CPPEditor::insertParagraphSeparator(const QTextCursor &tc) const
-{
-    MatchingText m;
-    return m.insertParagraphSeparator(tc);
-}
-
-
-bool CPPEditor::contextAllowsAutoParentheses(const QTextCursor &cursor,
-                                             const QString &textToInsert) const
-{
-    QChar ch;
-
-    if (! textToInsert.isEmpty())
-        ch = textToInsert.at(0);
-
-    if (! (MatchingText::shouldInsertMatchingText(cursor) || ch == QLatin1Char('\'') || ch == QLatin1Char('"')))
-        return false;
-    else if (isInComment(cursor))
-        return false;
-
-    return true;
-}
-
-bool CPPEditor::contextAllowsElectricCharacters(const QTextCursor &cursor) const
-{
-    const Token tk = SimpleLexer::tokenAt(cursor.block().text(), cursor.positionInBlock(), BackwardsScanner::previousBlockState(cursor.block()));
-
-    // XXX Duplicated from CPPEditor::isInComment to avoid tokenizing twice
-    if (tk.isComment()) {
-        const unsigned pos = cursor.selectionEnd() - cursor.block().position();
-
-        if (pos == tk.end()) {
-            if (tk.is(T_CPP_COMMENT) || tk.is(T_CPP_DOXY_COMMENT))
-                return false;
-
-            const int state = cursor.block().userState() & 0xFF;
-            if (state > 0)
-                return false;
-        }
-
-        if (pos < tk.end())
-            return false;
-    }
-    else if (tk.is(T_STRING_LITERAL) || tk.is(T_WIDE_STRING_LITERAL)
-        || tk.is(T_CHAR_LITERAL) || tk.is(T_WIDE_CHAR_LITERAL)) {
-
-        const unsigned pos = cursor.selectionEnd() - cursor.block().position();
-        if (pos <= tk.end())
-            return false;
-    }
-
-    return true;
-}
-
-bool CPPEditor::isInComment(const QTextCursor &cursor) const
-{
-    const Token tk = SimpleLexer::tokenAt(cursor.block().text(), cursor.positionInBlock(), BackwardsScanner::previousBlockState(cursor.block()));
-
-    if (tk.isComment()) {
-        const unsigned pos = cursor.selectionEnd() - cursor.block().position();
-
-        if (pos == tk.end()) {
-            if (tk.is(T_CPP_COMMENT) || tk.is(T_CPP_DOXY_COMMENT))
-                return true;
-
-            const int state = cursor.block().userState() & 0xFF;
-            if (state > 0)
-                return true;
-        }
-
-        if (pos < tk.end())
-            return true;
-    }
-
-    return false;
-}
-
 bool CPPEditor::event(QEvent *e)
 {
     switch (e->type()) {

src/plugins/cppeditor/cppeditor.h

@@ -207,17 +207,6 @@ protected:
 
     TextEditor::BaseTextEditorEditable *createEditableInterface();
 
-    virtual QString insertMatchingBrace(const QTextCursor &tc, const QString &text,
-                                        QChar la, int *skippedChars) const;
-
-    virtual QString insertParagraphSeparator(const QTextCursor &tc) const;
-
-    virtual bool contextAllowsAutoParentheses(const QTextCursor &cursor,
-                                              const QString &textToInsert = QString()) const;
-    virtual bool contextAllowsElectricCharacters(const QTextCursor &cursor) const;
-
-    virtual bool isInComment(const QTextCursor &cursor) const;
-
     const CPlusPlus::Macro *findCanonicalMacro(const QTextCursor &cursor,
                                                CPlusPlus::Document::Ptr doc) const;
 

src/plugins/cppeditor/cppeditor.pro

@@ -23,7 +23,8 @@ HEADERS += cppplugin.h \
     cpptypehierarchy.h \
     cppelementevaluator.h \
     cppquickfixcollector.h \
-    cppqtstyleindenter.h
+    cppqtstyleindenter.h \
+    cppautocompleter.h
 SOURCES += cppplugin.cpp \
     cppeditor.cpp \
     cpphighlighter.cpp \
@@ -40,6 +41,7 @@ SOURCES += cppplugin.cpp \
     cpptypehierarchy.cpp \
     cppelementevaluator.cpp \
     cppquickfixcollector.cpp \
-    cppqtstyleindenter.cpp
+    cppqtstyleindenter.cpp \
+    cppautocompleter.cpp
 RESOURCES += cppeditor.qrc
 OTHER_FILES += CppEditor.mimetypes.xml

src/plugins/qmljseditor/qmljsautocompleter.cpp

+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#include "qmljsautocompleter.h"
+
+#include <qmljs/qmljsscanner.h>
+
+#include <QtCore/QChar>
+#include <QtCore/QLatin1Char>
+#include <QtGui/QTextDocument>
+#include <QtGui/QTextCursor>
+#include <QtGui/QTextBlock>
+
+using namespace QmlJSEditor;
+using namespace Internal;
+using namespace QmlJS;
+
+static int blockStartState(const QTextBlock &block)
+{
+    int state = block.userState();
+
+    if (state == -1)
+        return 0;
+    else
+        return state & 0xff;
+}
+
+static Token tokenUnderCursor(const QTextCursor &cursor)
+{
+    const QString blockText = cursor.block().text();
+    const int blockState = blockStartState(cursor.block());
+
+    Scanner tokenize;
+    const QList<Token> tokens = tokenize(blockText, blockState);
+    const int pos = cursor.positionInBlock();
+
+    int tokenIndex = 0;
+    for (; tokenIndex < tokens.size(); ++tokenIndex) {
+        const Token &token = tokens.at(tokenIndex);
+
+        if (token.is(Token::Comment) || token.is(Token::String)) {
+            if (pos > token.begin() && pos <= token.end())
+                break;
+        } else {
+            if (pos >= token.begin() && pos < token.end())
+                break;
+        }
+    }
+
+    if (tokenIndex != tokens.size())
+        return tokens.at(tokenIndex);
+
+    return Token();
+}
+
+static bool shouldInsertMatchingText(QChar lookAhead)
+{
+    switch (lookAhead.unicode()) {
+    case '{': case '}':
+    case ']': case ')':
+    case ';': case ',':
+    case '"': case '\'':
+        return true;
+
+    default:
+        if (lookAhead.isSpace())
+            return true;
+
+        return false;
+    } // switch
+}
+
+static bool shouldInsertMatchingText(const QTextCursor &tc)
+{
+    QTextDocument *doc = tc.document();
+    return shouldInsertMatchingText(doc->characterAt(tc.selectionEnd()));
+}
+
+static bool shouldInsertNewline(const QTextCursor &tc)
+{
+    QTextDocument *doc = tc.document();
+    int pos = tc.selectionEnd();
+
+    // count the number of empty lines.
+    int newlines = 0;
+    for (int e = doc->characterCount(); pos != e; ++pos) {
+        const QChar ch = doc->characterAt(pos);
+
+        if (! ch.isSpace())
+            break;
+        else if (ch == QChar::ParagraphSeparator)
+            ++newlines;
+    }
+
+    if (newlines <= 1 && doc->characterAt(pos) != QLatin1Char('}'))
+        return true;
+
+    return false;
+}
+
+static bool isCompleteStringLiteral(const QStringRef &text)
+{
+    if (text.length() < 2)
+        return false;
+
+    const QChar quote = text.at(0);
+
+    if (text.at(text.length() - 1) == quote)
+        return text.at(text.length() - 2) != QLatin1Char('\\'); // ### not exactly.
+
+    return false;
+}
+
+AutoCompleter::AutoCompleter()
+{}
+
+AutoCompleter::~AutoCompleter()
+{}
+
+bool AutoCompleter::doContextAllowsAutoParentheses(const QTextCursor &cursor,
+                                                   const QString &textToInsert) const
+{
+    QChar ch;
+
+    if (! textToInsert.isEmpty())
+        ch = textToInsert.at(0);
+
+    switch (ch.unicode()) {
+    case '\'':
+    case '"':
+
+    case '(':
+    case '[':
+    case '{':
+
+    case ')':
+    case ']':
+    case '}':
+
+    case ';':
+        break;
+
+    default:
+        if (ch.isNull())
+            break;
+
+        return false;
+    } // end of switch
+
+    const Token token = tokenUnderCursor(cursor);
+    switch (token.kind) {
+    case Token::Comment:
+        return false;
+
+    case Token::String: {
+        const QString blockText = cursor.block().text();
+        const QStringRef tokenText = blockText.midRef(token.offset, token.length);
+        const QChar quote = tokenText.at(0);
+
+        if (ch != quote || isCompleteStringLiteral(tokenText))
+            break;
+
+        return false;
+    }
+
+    default:
+        break;
+    } // end of switch
+
+    return true;
+}
+
+bool AutoCompleter::doContextAllowsElectricCharacters(const QTextCursor &cursor) const
+{
+    Token token = tokenUnderCursor(cursor);
+    switch (token.kind) {
+    case Token::Comment:
+    case Token::String:
+        return false;
+    default:
+        return true;
+    }
+}
+
+bool AutoCompleter::doIsInComment(const QTextCursor &cursor) const
+{
+    return tokenUnderCursor(cursor).is(Token::Comment);
+}
+
+QString AutoCompleter::doInsertMatchingBrace(const QTextCursor &cursor,
+                                             const QString &text,
+                                             QChar,
+                                             int *skippedChars) const
+{
+    if (text.length() != 1)
+        return QString();
+
+    if (! shouldInsertMatchingText(cursor))
+        return QString();
+
+    const QChar la = cursor.document()->characterAt(cursor.position());
+
+    const QChar ch = text.at(0);
+    switch (ch.unicode()) {
+    case '\'':
+        if (la != ch)
+            return QString(ch);
+        ++*skippedChars;
+        break;
+
+    case '"':
+        if (la != ch)
+            return QString(ch);
+        ++*skippedChars;
+        break;
+
+    case '(':
+        return QString(QLatin1Char(')'));
+
+    case '[':
+        return QString(QLatin1Char(']'));
+
+    case '{':
+        return QString(); // nothing to do.
+
+    case ')':
+    case ']':
+    case '}':
+    case ';':
+        if (la == ch)
+            ++*skippedChars;
+        break;
+