Case with String

Ltech

I try to get my stuff compact.

In try to change

elseif STR.startsWithCharacters(STR.tokenizeCharacters(@filename[0]), String("INITIAL")) == TRUE
     do x

elseif STR.startsWithCharacters(STR.tokenizeCharacters(@filename[0]), String("LEFT")) == TRUE
     do y

......

It works try to cleanup with "case" statement

Like

case    STR.tokenizeCharacters(@filename[0])

                              string("INITIAL") :  do x

                              string("LEFT")    :   do y

And it will not do it

Somebody an direction ?

Thanks

Duane Degn

You'll likely need to do a string compare algorithm.

The line "string("INITIAL")" produces an address where "INITIAL" is stored in RAM. Each string statement will produce a new address so you can't compare this way.

Here's one way I've used. This technique will only compare the first four characters so you need to make sure the first four characters of each string are unique.

PUB ExecuteCmd(stringPtr)

  bytemove(@result, stringPtr, 4)

  case result
    initTxt: 
      ' do stuff to initialize
    leftTxt:
      ' do left stuff

DAT
initTxt       long
              byte "INITIAL", 0
leftTxt       long
              byte "LEFT" , 0

By defining the strings as longs before listing the characters in the string, the first four characters of the string can be treated as an independent long value.

Again, the limit of doing it this way is only the first four bytes of the string are tested. If a string has fewer than four characters, it should be padded with zeros at the end so it makes up a full long (though I'm not positive this is needed).

The above is an unconventional way to testing strings. For a more conventional way you can see how it's done in the Eddie firmware.

https://github.com/ddegn/EddieFirmware

The file "Eddie.spin" should show how this is done. If you want a complete program, download one of the archives.

Here's a section showing how "strcmp" is used.

  if strcomp(@InputBuffer, string("ACC"))
    ' do ACC stuff
  elseif strcomp(@InputBuffer, string("ADC"))         
    ' do ADC stuff

The string being compared needs to be the correct case and stored in the buffer named "InputBuffer."