CMake: Indentation and matching brace insertion for the CMake editor

Adds the following improvements to the CMake editor:
* Indentation support (both through Ctrl+I and when pressing enter)
* Insertion of matching paranthesis and quotes (pressing '(' inserts ')')

Change-Id: If9a63b08b3e0897989e4d8ac69e3acc072b0b825
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>

src/plugins/cmakeprojectmanager/cmakeautocompleter.cpp

@@ -0,0 +1,135 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 Jan Dalheimer <jan@dalheimer.de>
+** Contact: http://www.qt.io/licensing
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company.  For licensing terms and
+** conditions see http://www.qt.io/terms-conditions.  For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** 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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, The Qt Company gives you certain additional
+** rights.  These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "cmakeautocompleter.h"
+
+#include <QTextCursor>
+#include <QTextBlock>
+#include <QDebug>
+
+#include <texteditor/tabsettings.h>
+
+namespace CMakeProjectManager {
+namespace Internal {
+
+CMakeAutoCompleter::CMakeAutoCompleter()
+{
+    setAutoParenthesesEnabled(true);
+}
+
+bool CMakeAutoCompleter::isInComment(const QTextCursor &cursor) const
+{
+    // NOTE: This doesn't handle '#' inside quotes, nor multi-line comments
+    QTextCursor moved = cursor;
+    moved.movePosition(QTextCursor::StartOfLine, QTextCursor::KeepAnchor);
+    if (moved.selectedText().contains(QLatin1Char('#')))
+        return true;
+    else
+        return false;
+}
+
+bool CMakeAutoCompleter::isInString(const QTextCursor &cursor) const
+{
+    // NOTE: multiline strings are currently not supported, since they rarely, if ever, seem to be used
+    QTextCursor moved = cursor;
+    moved.movePosition(QTextCursor::StartOfLine);
+    const int positionInLine = cursor.position() - moved.position();
+    moved.movePosition(QTextCursor::EndOfLine, QTextCursor::KeepAnchor);
+    const QString line = moved.selectedText();
+
+    bool isEscaped = false;
+    bool inString = false;
+    for (int i = 0; i < positionInLine; ++i) {
+        const QChar c = line.at(i);
+        if (c == QLatin1Char('\\') && !isEscaped)
+            isEscaped = true;
+        else if (c == QLatin1Char('"') && !isEscaped)
+            inString = !inString;
+        else
+            isEscaped = false;
+    }
+    return inString;
+}
+
+QString CMakeAutoCompleter::insertMatchingBrace(const QTextCursor &cursor, const QString &text, QChar la, int *skippedChars) const
+{
+    Q_UNUSED(cursor)
+    Q_UNUSED(skippedChars);
+    if (text.isEmpty())
+        return QString();
+    const QChar current = text.at(0);
+    switch (current.unicode()) {
+    case '"':
+        if (la != current)
+            return QStringLiteral("\"");
+        ++*skippedChars;
+        break;
+
+    case '(':
+        return QStringLiteral(")");
+
+    case ')':
+        if (current == la)
+            ++*skippedChars;
+        break;
+
+    default:
+        break;
+    }
+
+    return QString();
+}
+
+int CMakeAutoCompleter::paragraphSeparatorAboutToBeInserted(QTextCursor &cursor, const TextEditor::TabSettings &tabSettings)
+{
+    const QString line = cursor.block().text().trimmed();
+    if (line.contains(QRegExp(QStringLiteral("^(endfunction|endmacro|endif|endforeach|endwhile)\\w*\("))))
+        tabSettings.indentLine(cursor.block(), tabSettings.indentationColumn(cursor.block().text()));
+    return 0;
+}
+
+bool CMakeAutoCompleter::contextAllowsAutoParentheses(const QTextCursor &cursor, const QString &textToInsert) const
+{
+    if (textToInsert.isEmpty())
+        return false;
+
+    const QChar c = textToInsert.at(0);
+    if (c == QLatin1Char('"') || c == QLatin1Char('(') || c == QLatin1Char(')'))
+        return !isInComment(cursor);
+    return false;
+}
+
+bool CMakeAutoCompleter::contextAllowsElectricCharacters(const QTextCursor &cursor) const
+{
+    return !isInComment(cursor) && !isInString(cursor);
+}
+
+} // namespace Internal
+} // namespace CMakeProjectManager