Bug? ToLowerCase does not work correctly for the Turkish language

alwaysbusy

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Licensed User
Longtime User
Searching for a bug in my BANano library, I discovered a bug in the .toLowerCase() for the letter I in the Turkish language.

In the Turkish locale, the Unicode LATIN CAPITAL LETTER I becomes a LATIN SMALL LETTER DOTLESS I. That’s not a lowercase “i”.

To test:
B4X: 
#VirtualMachineArgs: -Duser.language=tr

B4X: 
Dim s As String = "IF"
If s.toLowerCase = "if" Then '  the s.toLowerCase returns ıf (no dot on the i)
        Log("True")
Else
        Log("False")
End If

Result:
returns False

Possible solution, being able to add a Locale:
B4X: 
.toLowerCase2(Locale.ROOT)

Edit: the same goes for .toUpperCase()

Alwaysbusy
 
Last edited:

Erel

B4X founder
Staff member
Licensed User
Longtime User
You can call this method when the app starts to set the default locale to US.
B4X: 
Private Sub SetDefaultLocaleToUS
    Dim jo As JavaObject
    jo.InitializeStatic("java.util.Locale").RunMethod("setDefault", Array(jo.GetField("US")))
End Sub

If you want to keep using the native locale for date related methods then set the date format before calling this method.
 
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