Clang: Provide all overloads for function definition completion

When we complete a function definition with the parameter list
it is important to have multiple entries to select.

Change-Id: I25e94b58cfe4831387d66eecdec74712addb7ec5
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

1 files changed, 38 insertions, 0 deletions

diff --git a/src/libs/utils/textutils.h b/src/libs/utils/textutils.h
index 0f848417f9..c03e7ce2ce 100644
--- a/src/libs/utils/textutils.h
+++ b/src/libs/utils/textutils.h
@@ -29,6 +29,7 @@
 #include "utils_global.h"
 
 #include <QString>
+#include <QTextCursor>
 
 QT_FORWARD_DECLARE_CLASS(QTextDocument)
 QT_FORWARD_DECLARE_CLASS(QTextCursor)
@@ -54,5 +55,42 @@ QTCREATOR_UTILS_EXPORT QTextCursor flippedCursor(const QTextCursor &cursor);
 
 QTCREATOR_UTILS_EXPORT QTextCursor wordStartCursor(const QTextCursor &cursor);
 
+template <class CharacterProvider>
+void moveToPrevChar(CharacterProvider &provider, QTextCursor &cursor)
+{
+    cursor.movePosition(QTextCursor::PreviousCharacter);
+    while (provider.characterAt(cursor.position()).isSpace())
+        cursor.movePosition(QTextCursor::PreviousCharacter);
+}
+
+template <class CharacterProvider>
+bool matchPreviousWord(CharacterProvider &provider, QTextCursor cursor, QString pattern)
+{
+    cursor.movePosition(QTextCursor::PreviousWord);
+    while (provider.characterAt(cursor.position()) == ':')
+        cursor.movePosition(QTextCursor::PreviousWord, QTextCursor::MoveAnchor, 2);
+
+    int previousWordStart = cursor.position();
+    cursor.movePosition(QTextCursor::NextWord);
+    moveToPrevChar(provider, cursor);
+    QString toMatch = provider.textAt(previousWordStart, cursor.position() - previousWordStart + 1);
+
+    pattern = pattern.simplified();
+    while (!pattern.isEmpty() && pattern.endsWith(toMatch)) {
+        pattern.chop(toMatch.length());
+        if (pattern.endsWith(' '))
+            pattern.chop(1);
+        if (!pattern.isEmpty()) {
+            cursor.movePosition(QTextCursor::StartOfWord);
+            cursor.movePosition(QTextCursor::PreviousWord);
+            previousWordStart = cursor.position();
+            cursor.movePosition(QTextCursor::NextWord);
+            moveToPrevChar(provider, cursor);
+            toMatch = provider.textAt(previousWordStart, cursor.position() - previousWordStart + 1);
+        }
+    }
+    return pattern.isEmpty();
+}
+
 } // Text
 } // Utils