6.2.0873
CASE
 
CORE EXT
Interpretation:
Interpretation semantics for this word are undefined.

Compilation:
( C: -- case-sys )

Mark the start of the CASE...OF...ENDOF...ENDCASE structure. Append the run-time semantics given below to the current definition.

Run-time:
( -- )

Continue execution.

See:
6.2.1342 ENDCASE, 6.2.1343 ENDOF, 6.2.1950 OF, A.6.2.0873 CASE.

Rationale:
Typical use:
: X ...
   CASE
   test1 OF ... ENDOF
   testn OF ... ENDOF
   ... ( default )
   ENDCASE ...
;
Testing:
: cs1 CASE 1 OF 111 ENDOF
   2 OF 222 ENDOF
   3 OF 333 ENDOF
   >R 999 R>
   ENDCASE
;

T{ 1 cs1 -> 111 }T
T{ 2 cs1 -> 222 }T
T{ 3 cs1 -> 333 }T
T{ 4 cs1 -> 999 }T
: cs2 >R CASE
   -1 OF CASE R@ 1 OF 100 ENDOF
                2 OF 200 ENDOF
                >R -300 R>
        ENDCASE
     ENDOF
   -2 OF CASE R@ 1 OF -99 ENDOF
                >R -199 R>
        ENDCASE
     ENDOF
     >R 299 R>
   ENDCASE R> DROP ;

T{ -1 1 cs2 ->  100 }T
T{ -1 2 cs2 ->  200 }T
T{ -1 3 cs2 -> -300 }T
T{ -2 1 cs2 ->  -99 }T
T{ -2 2 cs2 -> -199 }T
T{  0 2 cs2 ->  299 }T