\ @(#) case.fth 98/01/26 1.2\ CASE Statement\\ This definition is based upon Wil Baden's assertion that\ >MARK >RESOLVE ?BRANCH etc. are not needed if one has IF ELSE THEN etc.\\ Author: Phil Burk\ Copyright 1994 3DO, Phil Burk, Larry Polansky, David Rosenboom\\ The pForth software code is dedicated to the public domain,\ and any third party may reproduce, distribute and modify\ the pForth software code or any derivative works thereof\ without any compensation or license.  The pForth software\ code is provided on an "as is" basis without any warranty\ of any kind, including, without limitation, the implied\ warranties of merchantability and fitness for a particular\ purpose and their equivalents under the laws of any jurisdiction.\\ MOD: PLB 6/24/91 Check for missing ENDOF\ MOD: PLB 8/7/91 Add ?OF and RANGEOF\ MOD: PLB 11/2/99 Fixed nesting of CASE. Needed to save of-depth on stack as well as case-depth. anew TASK-CASE variable CASE-DEPTHvariable OF-DEPTH : CASE  ( n -- , start case statement ) ( -c- case-depth )    ?comp    of-depth @   0 of-depth !   \ 11/2/99    case-depth @ 0 case-depth !  ( allow nesting ); IMMEDIATE : ?OF  ( n flag -- | n , doit if true ) ( -c- addr )    [compile] IF    compile drop    1 case-depth +!    1 of-depth +!; IMMEDIATE : OF  ( n t -- | n , doit if match ) ( -c- addr )    ?comp    compile over compile =    [compile] ?OF; IMMEDIATE : (RANGEOF?)  ( n lo hi -- | n  flag )    >r over ( n lo n ) <=    IF        dup r> ( n n hi ) <=    ELSE        rdrop false    THEN; : RANGEOF  ( n lo hi -- | n , doit if within ) ( -c- addr )    compile (rangeof?)    [compile] ?OF; IMMEDIATE : ENDOF  ( -- ) ( addr -c- addr' )    [compile] ELSE    -1 of-depth +!; IMMEDIATE : ENDCASE ( n -- )  ( old-case-depth addr' addr' ??? -- )    of-depth @    IF >newline ." Missing ENDOF in CASE!" cr abort    THEN\    compile drop    case-depth @ 0    ?DO [compile] THEN    LOOP    case-depth !    of-depth !; IMMEDIATE