refactor: move MMCStrings -> StringUtils

General utilities can go in here >:)

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/StringUtils.cpp

@@ -0,0 +1,76 @@
+#include "StringUtils.h"
+
+/// TAKEN FROM Qt, because it doesn't expose it intelligently
+static inline QChar getNextChar(const QString &s, int location)
+{
+    return (location < s.length()) ? s.at(location) : QChar();
+}
+
+/// TAKEN FROM Qt, because it doesn't expose it intelligently
+int StringUtils::naturalCompare(const QString &s1, const QString &s2, Qt::CaseSensitivity cs)
+{
+    for (int l1 = 0, l2 = 0; l1 <= s1.count() && l2 <= s2.count(); ++l1, ++l2)
+    {
+        // skip spaces, tabs and 0's
+        QChar c1 = getNextChar(s1, l1);
+        while (c1.isSpace())
+            c1 = getNextChar(s1, ++l1);
+        QChar c2 = getNextChar(s2, l2);
+        while (c2.isSpace())
+            c2 = getNextChar(s2, ++l2);
+
+        if (c1.isDigit() && c2.isDigit())
+        {
+            while (c1.digitValue() == 0)
+                c1 = getNextChar(s1, ++l1);
+            while (c2.digitValue() == 0)
+                c2 = getNextChar(s2, ++l2);
+
+            int lookAheadLocation1 = l1;
+            int lookAheadLocation2 = l2;
+            int currentReturnValue = 0;
+            // find the last digit, setting currentReturnValue as we go if it isn't equal
+            for (QChar lookAhead1 = c1, lookAhead2 = c2;
+                 (lookAheadLocation1 <= s1.length() && lookAheadLocation2 <= s2.length());
+                 lookAhead1 = getNextChar(s1, ++lookAheadLocation1),
+                       lookAhead2 = getNextChar(s2, ++lookAheadLocation2))
+            {
+                bool is1ADigit = !lookAhead1.isNull() && lookAhead1.isDigit();
+                bool is2ADigit = !lookAhead2.isNull() && lookAhead2.isDigit();
+                if (!is1ADigit && !is2ADigit)
+                    break;
+                if (!is1ADigit)
+                    return -1;
+                if (!is2ADigit)
+                    return 1;
+                if (currentReturnValue == 0)
+                {
+                    if (lookAhead1 < lookAhead2)
+                    {
+                        currentReturnValue = -1;
+                    }
+                    else if (lookAhead1 > lookAhead2)
+                    {
+                        currentReturnValue = 1;
+                    }
+                }
+            }
+            if (currentReturnValue != 0)
+                return currentReturnValue;
+        }
+        if (cs == Qt::CaseInsensitive)
+        {
+            if (!c1.isLower())
+                c1 = c1.toLower();
+            if (!c2.isLower())
+                c2 = c2.toLower();
+        }
+        int r = QString::localeAwareCompare(c1, c2);
+        if (r < 0)
+            return -1;
+        if (r > 0)
+            return 1;
+    }
+    // The two strings are the same (02 == 2) so fall back to the normal sort
+    return QString::compare(s1, s2, cs);
+}