qt/tonalutils: Add support for parsing lower value "reserved" Tonal digits (0-8)

Author: luke-jr

src/qt/tonalutils.cpp

@@ -38,7 +38,7 @@ bool TonalUtils::Supported()
     return false;
 }
 
-#define RE_TONAL_DIGIT "[\\d\\xe8e9-\\xe8ef\\xe9d9-\\xe9df]"
+#define RE_TONAL_DIGIT "[\\d\\xe8e0-\\xe8ef\\xe9d0-\\xe9df]"
 static QRegExpValidator tv(QRegExp("-?(?:" RE_TONAL_DIGIT "+\\.?|" RE_TONAL_DIGIT "*\\." RE_TONAL_DIGIT "*)"), nullptr);
 
 QValidator::State TonalUtils::validate(QString&input, int&pos)
@@ -67,15 +67,15 @@ void TonalUtils::ConvertToHex(QString&str)
     for (int i = 0; i < str.size(); ++i)
     {
         ushort c = str[i].unicode();
-        if (c == 0xe9d9 || c == 0xe8e9) {
-            str[i] = '9';
-        }
-        else
         if (c == '9')
             str[i] = 'a';
         else
-        if (c >= 0xe8ea && c <= 0xe8ef) {
+        if (c >= 0xe8e0 && c <= 0xe8e9) {  // UCSUR 0-9
+            str[i] = c - (0xe8e0 - '0');
+        } else if (c >= 0xe8ea && c <= 0xe8ef) {  // UCSUR a-f
             str[i] = c - (0xe8ea - 'a');
+        } else if (c >= 0xe9d0 && c <= 0xe9d9) {
+            str[i] = c - (0xe9d0 - '0');
         } else
         if (c >= 0xe9da && c <= 0xe9df)
             str[i] = c - 0xe999;