- Fehler in mehrzeiligen Kommentaren behoben

- Klammerpaare werden farblich hervorgehoben
- Beim einrücken oder ausrücken eines markierten Blocks wird die Zeile, in der der Coursor steht, nicht mehr mitgerückt
- Beim eintippen von Variablen wird eine Liste mit bereits deklarierten Variablen angezeigt

src/editor/VariableCompleter.cpp

@@ -0,0 +1,243 @@
+#include "VariableCompleter.h"
+#include "CodeEditor.h"
+
+#include <QTextCursor>
+#include <QTextBlock>
+#include <QKeyEvent>
+#include <QListWidgetItem>
+#include <QAbstractItemView>
+#include <QScrollBar>
+#include <QApplication>
+#include <QScreen>
+
+VariableCompleter::VariableCompleter(CodeEditor *editor)
+    : QObject(editor)
+    , m_editor(editor)
+{
+    // Popup als eigenständiges, rahmenloses Werkzeugfenster
+    m_popup = new QListWidget(nullptr);
+    m_popup->setWindowFlags(Qt::Tool | Qt::FramelessWindowHint |
+                             Qt::WindowStaysOnTopHint);
+    m_popup->setAttribute(Qt::WA_ShowWithoutActivating);
+    m_popup->setFocusPolicy(Qt::NoFocus);
+    m_popup->setMaximumHeight(200);
+    m_popup->setMinimumWidth(180);
+    m_popup->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    m_popup->setStyleSheet(
+        "QListWidget {"
+        "  border: 1px solid palette(mid);"
+        "  background: palette(toolTipBase);"
+        "  color: palette(toolTipText);"
+        "  font-family: Monospace;"
+        "}"
+        "QListWidget::item:selected {"
+        "  background: palette(highlight);"
+        "  color: palette(highlightedText);"
+        "}"
+    );
+
+    connect(m_popup, &QListWidget::itemActivated,
+            this, &VariableCompleter::onItemActivated);
+}
+
+// ---------------------------------------------------------------------------
+// Nach jedem Tastendruck aufrufen
+// ---------------------------------------------------------------------------
+void VariableCompleter::handleKeyPress(QKeyEvent *event)
+{
+    // Popup-Navigation
+    if (m_popup->isVisible())
+    {
+        if (event->key() == Qt::Key_Escape)
+        {
+            hidePopup();
+            return;
+        }
+        if (event->key() == Qt::Key_Return || event->key() == Qt::Key_Enter)
+        {
+            if (m_popup->currentItem())
+            {
+                onItemActivated(m_popup->currentItem());
+            }
+            hidePopup();
+            return;
+        }
+        if (event->key() == Qt::Key_Down)
+        {
+            const int next = qMin(m_popup->currentRow() + 1,
+                                  m_popup->count() - 1);
+            m_popup->setCurrentRow(next);
+            return;
+        }
+        if (event->key() == Qt::Key_Up)
+        {
+            const int prev = qMax(m_popup->currentRow() - 1, 0);
+            m_popup->setCurrentRow(prev);
+            return;
+        }
+    }
+
+    // Nach dem normalen Tastendruck Popup aktualisieren
+    // (der Event wurde bereits an QPlainTextEdit weitergegeben)
+    updatePopup();
+}
+
+// ---------------------------------------------------------------------------
+// Popup aktualisieren
+// ---------------------------------------------------------------------------
+void VariableCompleter::updatePopup()
+{
+    const QString prefix = currentPrefix();
+
+    // Nur bei $ und mindestens einem weiteren Zeichen anzeigen
+    if (prefix.length() < 2 || !prefix.startsWith('$'))
+    {
+        hidePopup();
+        return;
+    }
+
+    const QStringList allVars = collectVariables();
+    const QString     filter  = prefix.toLower();
+
+    QStringList matches;
+    for (const QString &var : allVars)
+    {
+        if (var.toLower().startsWith(filter) && var != prefix)
+        {
+            matches.append(var);
+        }
+    }
+
+    if (matches.isEmpty())
+    {
+        hidePopup();
+        return;
+    }
+
+    // Popup befüllen
+    m_popup->clear();
+    for (const QString &var : matches)
+    {
+        m_popup->addItem(var);
+    }
+    m_popup->setCurrentRow(0);
+
+    // Größe anpassen
+    const int itemHeight = m_popup->sizeHintForRow(0) + 2;
+    const int height     = qMin(matches.size() * itemHeight + 4, 200);
+    m_popup->setFixedHeight(height);
+
+    // Position unter dem Cursor
+    const QRect cursorRect = m_editor->cursorRect();
+    QPoint pos = m_editor->viewport()->mapToGlobal(
+        QPoint(cursorRect.left(), cursorRect.bottom() + 2)
+    );
+
+    // Nicht aus dem Bildschirm herausragen
+    const QRect screen = QApplication::primaryScreen()->availableGeometry();
+    if (pos.x() + m_popup->width() > screen.right())
+    {
+        pos.setX(screen.right() - m_popup->width());
+    }
+    if (pos.y() + height > screen.bottom())
+    {
+        pos.setY(cursorRect.top() - height - 2);
+    }
+
+    m_popup->move(pos);
+    m_popup->show();
+    m_popup->raise();
+}
+
+void VariableCompleter::hidePopup()
+{
+    m_popup->hide();
+    m_popup->clear();
+}
+
+// ---------------------------------------------------------------------------
+// Variablen im aktuellen Dokument sammeln
+// ---------------------------------------------------------------------------
+QStringList VariableCompleter::collectVariables() const
+{
+    static const QRegularExpression varRegex(R"(\$[a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)");
+
+    QSet<QString> seen;
+    QStringList   result;
+
+    const QString text = m_editor->toPlainText();
+    QRegularExpressionMatchIterator it = varRegex.globalMatch(text);
+
+    while (it.hasNext())
+    {
+        const QString var = it.next().captured(0);
+        if (!seen.contains(var))
+        {
+            seen.insert(var);
+            result.append(var);
+        }
+    }
+
+    result.sort(Qt::CaseInsensitive);
+    return result;
+}
+
+// ---------------------------------------------------------------------------
+// Text links vom Cursor — das angefangene $variable
+// ---------------------------------------------------------------------------
+QString VariableCompleter::currentPrefix() const
+{
+    const QTextCursor cursor = m_editor->textCursor();
+    const QString     line   = cursor.block().text();
+    const int         col    = cursor.columnNumber();
+
+    if (col == 0)
+    {
+        return QString();
+    }
+
+    // Rückwärts gehen bis zum $ oder einem Nicht-Bezeichner-Zeichen
+    int start = col - 1;
+    while (start > 0)
+    {
+        const QChar c = line[start - 1];
+        if (!c.isLetterOrNumber() && c != '_' && c != '$')
+        {
+            break;
+        }
+        --start;
+    }
+
+    const QString token = line.mid(start, col - start);
+    return token.startsWith('$') ? token : QString();
+}
+
+// ---------------------------------------------------------------------------
+// Klick oder Enter — Variable einfügen
+// ---------------------------------------------------------------------------
+void VariableCompleter::onItemActivated(QListWidgetItem *item)
+{
+    if (!item)
+    {
+        return;
+    }
+
+    const QString selected = item->text();
+    const QString prefix   = currentPrefix();
+
+    if (prefix.isEmpty())
+    {
+        hidePopup();
+        return;
+    }
+
+    // Prefix durch den vollständigen Variablennamen ersetzen
+    QTextCursor cursor = m_editor->textCursor();
+    cursor.movePosition(QTextCursor::Left,
+                        QTextCursor::KeepAnchor,
+                        prefix.length());
+    cursor.insertText(selected);
+
+    m_editor->setTextCursor(cursor);
+    hidePopup();
+}