iOS: refactor removeMnemonics(const QString &) to QPlatformTheme

This function is needed across several OS', so refactor it out to
a common place.

Change-Id: I35b957029c965672739d03cd2db3e87f5bd0acdf
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>

2 files changed, 36 insertions, 0 deletions

diff --git a/src/gui/kernel/qplatformtheme.cpp b/src/gui/kernel/qplatformtheme.cpp
index ce8548f628..61dacfa076 100644
--- a/src/gui/kernel/qplatformtheme.cpp
+++ b/src/gui/kernel/qplatformtheme.cpp
@@ -682,6 +682,41 @@ QString QPlatformTheme::defaultStandardButtonText(int button)
     return QString();
 }
 
+QString QPlatformTheme::removeMnemonics(const QString &original)
+{
+    QString returnText(original.size(), 0);
+    int finalDest = 0;
+    int currPos = 0;
+    int l = original.length();
+    while (l) {
+        if (original.at(currPos) == QLatin1Char('&')
+            && (l == 1 || original.at(currPos + 1) != QLatin1Char('&'))) {
+            ++currPos;
+            --l;
+            if (l == 0)
+                break;
+        } else if (original.at(currPos) == QLatin1Char('(') && l >= 4 &&
+                   original.at(currPos + 1) == QLatin1Char('&') &&
+                   original.at(currPos + 2) != QLatin1Char('&') &&
+                   original.at(currPos + 3) == QLatin1Char(')')) {
+            /* remove mnemonics its format is "\s*(&X)" */
+            int n = 0;
+            while (finalDest > n && returnText.at(finalDest - n - 1).isSpace())
+                ++n;
+            finalDest -= n;
+            currPos += 4;
+            l -= 4;
+            continue;
+        }
+        returnText[finalDest] = original.at(currPos);
+        ++currPos;
+        ++finalDest;
+        --l;
+    }
+    returnText.truncate(finalDest);
+    return returnText;
+}
+
 unsigned QPlatformThemePrivate::currentKeyPlatforms()
 {
     const uint keyboardScheme = QGuiApplicationPrivate::platformTheme()->themeHint(QPlatformTheme::KeyboardScheme).toInt();
diff --git a/src/gui/kernel/qplatformtheme.h b/src/gui/kernel/qplatformtheme.h
index 69cc2f90af..9355e83491 100644
--- a/src/gui/kernel/qplatformtheme.h
+++ b/src/gui/kernel/qplatformtheme.h
@@ -301,6 +301,7 @@ public:
 
     static QVariant defaultThemeHint(ThemeHint hint);
     static QString defaultStandardButtonText(int button);
+    static QString removeMnemonics(const QString &original);
 
 protected:
     explicit QPlatformTheme(QPlatformThemePrivate *priv);