Completion: Don't propose when there's a "good" candidate

This also generalizes some code previously specific to C++.

Change-Id: I5774d04a45f28a4e276a0ef282ce0aa5a2f2e552
Reviewed-on: http://codereview.qt.nokia.com/48
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

src/plugins/cpptools/cppcompletionassist.cpp

@@ -698,28 +698,6 @@ IAssistProposal * CppCompletionAssistProcessor::perform(const IAssistInterface *
         if (m_hintProposal)
             return m_hintProposal;
 
-        if (interface->reason() == IdleEditor) {
-            const int pos = m_interface->position();
-            const QChar ch = m_interface->characterAt(pos);
-            if (! (ch.isLetterOrNumber() || ch == QLatin1Char('_'))) {
-                for (int i = pos - 1;; --i) {
-                    const QChar ch = m_interface->characterAt(i);
-                    if (ch.isLetterOrNumber() || ch == QLatin1Char('_')) {
-                        const QString wordUnderCursor = m_interface->textAt(i, pos - i);
-                        if (wordUnderCursor.at(0).isLetter() || wordUnderCursor.at(0) == QLatin1Char('_')) {
-                            foreach (const BasicProposalItem *item, m_completions) {
-                                if (item->text() == wordUnderCursor)
-                                    return 0;
-                            }
-                        } else {
-                            return 0;
-                        }
-                    } else
-                        break;
-                }
-            }
-        }
-
         if (m_model->m_completionOperator != T_EOF_SYMBOL)
             m_model->m_sortable = true;
         else

src/plugins/texteditor/codeassist/basicproposalitemlistmodel.cpp

@@ -241,14 +241,6 @@ QString BasicProposalItemListModel::proposalPrefix() const
 
     // Compute common prefix
     QString firstKey = m_currentItems.first()->text();
-    int ignore = 0;
-    for (int i = firstKey.length() - 1; i >= 0; --i, ++ignore) {
-        const QChar &c = firstKey.at(i);
-        if (c.isLetterOrNumber() || c == QLatin1Char('_'))
-            break;
-    }
-    if (ignore)
-        firstKey.chop(ignore);
     QString lastKey = m_currentItems.last()->text();
     const int length = qMin(firstKey.length(), lastKey.length());
     firstKey.truncate(length);

src/plugins/texteditor/codeassist/genericproposalwidget.cpp

@@ -57,8 +57,53 @@
 #include <QtGui/QDesktopWidget>
 #include <QtGui/QLabel>
 
+
 namespace TextEditor {
 
+namespace {
+
+QString cleanText(const QString &original)
+{
+    QString clean = original;
+    int ignore = 0;
+    for (int i = clean.length() - 1; i >= 0; --i, ++ignore) {
+        const QChar &c = clean.at(i);
+        if (c.isLetterOrNumber() || c == QLatin1Char('_'))
+            break;
+    }
+    if (ignore)
+        clean.chop(ignore);
+    return clean;
+}
+
+bool hasMatch(const QString &prefix, const IGenericProposalModel *model)
+{
+    if (prefix.isEmpty())
+        return false;
+
+    for (int i = 0; i < model->size(); ++i) {
+        const QString &current = cleanText(model->text(i));
+        if (!current.isEmpty()) {
+            TextEditor::CaseSensitivity cs =
+                TextEditor::TextEditorSettings::instance()->completionSettings().m_caseSensitivity;
+            if (cs == TextEditor::CaseSensitive) {
+                if (prefix == current)
+                    return true;
+            } else if (cs == TextEditor::CaseInsensitive) {
+                if (prefix.compare(current, Qt::CaseInsensitive) == 0)
+                    return true;
+            } else if (cs == TextEditor::FirstLetterCaseSensitive) {
+                if (prefix.at(0) == current.at(0)
+                        && prefix.midRef(1).compare(current.midRef(1), Qt::CaseInsensitive) == 0)
+                    return true;
+            }
+        }
+    }
+    return false;
+}
+
+}
+
 // ------------
 // ModelAdapter
 // ------------
@@ -380,7 +425,7 @@ bool GenericProposalWidget::updateAndCheck(const QString &prefix)
     if (!prefix.isEmpty())
         m_d->m_model->filter(prefix);
     if (m_d->m_model->size() == 0
-            || (m_d->m_model->size() == 1 && prefix == m_d->m_model->proposalPrefix())) {
+            || (m_d->m_reason == IdleEditor && hasMatch(prefix, m_d->m_model))) {
         abort();
         return false;
     }