string_list(?String, ?List)

?String

String or variable.

?List

List of integers (in the range 0 to 255) and/or variables, or else a variable.

Description

If String is instantiated, unifies List with the list whose elements are the ASCII codes for the elements of the string.

If List is instantiated, unifies String with the string corresponding to this list of ASCII codes.

Fail Conditions

Resatisfiable

Exceptions

(5) type error

String is neither a string nor a variable.

(5) type error

List is neither a list nor a variable.

(6) out of range

One (or more) elements of List are not integers in the range 0 to 255.

(4) instantiation fault

Neither String or List are ground (non-coroutine mode only).

Examples

   Success:
   string_list(S,[65,98,99]).          (gives S="Abc").
   string_list("abc",L).               (gives L=[97,98,99]).
   string_list("abc",[97,A,99]).       (gives A=98).
   string_list(S,[127]).               (gives S="").
   string_list("abc",[97|A]).          (gives A=[98,99]).
   Fail:
   string_list("abc",[98,99,100]).
   Error:
   string_list(S,[A|[128]]).           (Error 4).
   string_list(S,[1|A]).               (Error 4).
   string_list('string',L).            (Error 5).
   string_list(S,"list").              (Error 5).
   string_list('string',[128]).        (Error 5).
   string_list(S,["B"]).               (Error 5).
   string_list(S,[256]).               (Error 6).

See Also