How to check the text assigned to a Variable

[micheus]

(02-08-2013 08:22 PM)oort Wrote:  Texname is the variable that gets assigned a name (w_default_Bronze_1 or w_default_Bronze_2). I need to check to see if I am working with w_default_Bronze_1 or if I am working with w_default_Bronze_2. I need to know this because they have to be handled differently when exporting them for YafaRay.

Probably someone could put a different code - it always possible use different ways - I'll left two that works.

This one will check for fail (but, I don't think you need to check if is number, since you have formated the string before):

Code:

Tokens=string:tokens(Texname,"_"),
    Num=lists:last(Tokens),
    case string:to_integer(Num) of
        {error, _} -> io:format("Conversion error\n",[]);
        {1, _} -> io:format("Item 1 selected\n",[]);
        {2, _} -> io:format("Item 2 selected\n",[])
    end,

For Texname="w_default_Bronze_2" tokens will return ["w","default","Bronze","2"].

This can crash Wings if you can get an invalid number to Num:

Code:

Tokens=string:tokens(Texname,"_"),
    Num=lists:last(Tokens),
    case list_to_integer(Num) of
        1 -> io:format("Item 1 selected\n",[]);
        2 -> io:format("Item 2 selected\n",[]);
        N -> io:format("Item ~p selected\n",[N])
    end,

Function references - check than to understand what each one do:

• string:tokens()
• string:to_integer()
• lists:last()
• list_to_integer()