Multi-User Forth - Programming language

Multi-User Forth, aka Multi-User Forth, is a programming language created in 1995.

#1555on PLDB

29Years Old

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TinyMUCK or, more broadly, a MUCK, is a type of user-extendable online text-based role-playing game, designed for role playing and social interaction. Backronyms like "Multi-User Chat/Created/Computer/Character/Carnal Kingdom" and "Multi-User Construction Kit" are sometimes cited, but are not the actual origin of the term; "muck" is simply a play on the term MUD.. Read more on Wikipedia...

Tags: programming language
There are at least 0 Multi-User Forth repos on GitHub
Early development of Multi-User Forth happened in University of California Berkeley
Explore Multi-User Forth snippets on Rosetta Code
See also: (2 related languages) Multi-User Forth, Forth

Example from the web:

$include $lib/strings
$include $lib/match
lvar check-obj-addr
   
: check-next-loop (d -- )
   dup not if pop exit then
   dup exit? over thing? or
   me @ 3 pick .controls and if
      dup check-obj-addr @ execute
   then
   next check-next-loop
;
   
: check-contents (d -- )
   contents check-next-loop
;
   
: check-exits (d -- )
   exits check-next-loop
;
   
: exec-err (d mtypestr warnstr -- )
   "On " 4 rotate unparseobj strcat
   ", in it's " strcat rot strcat
   ", " strcat swap strcat .tell
;
   
: can-linkto? (player object -- i)
   dup "link_ok" flag? if pop pop 1 exit then
   .controls
;
   
: check-exec (d mtype execstr -- )
   dup "@" 1 strncmp if pop pop pop exit then
   1 strcut swap pop
   " " .split pop
   dup "TEMPLATEquot; 1 strncmp not if
      dup match ok? not if
         " is not a known registered program." strcat
         exec-err exit
      then
      dup match program? not if
         " is not a program." strcat
         exec-err exit
      then
      3 pick owner over match can-linkto? not if
         " is not Link_OK." strcat
         exec-err exit
      then
   else
      dup number? not if
         " is not a program dbref." strcat
         "@" swap strcat exec-err exit
      then
      dup atoi dbref ok? not if
         " is not a valid program reference." strcat
         "@" swap strcat exec-err exit
      then
      dup atoi dbref program? not if
         " is not a valid program reference." strcat
         "@" swap strcat exec-err exit
      then
      3 pick owner over atoi dbref can-linkto? not if
         " is not Link_OK." strcat
         "@" swap strcat exec-err exit
      then
   then
   pop pop pop
;
   
   
: missing-err ( d s -- )
   swap unparseobj
   " is missing an "
   strcat swap strcat
   " message." strcat .tell
;
   
: colon-err ( d s -- )
   swap unparseobj
   " has an unnecesary ':' at the start of its "
   strcat swap strcat
   " message." strcat .tell
;
   
: check-desc (d -- )
   dup desc not if
      "@description" missing-err
   else
      "@description" over
      desc check-exec
   then
;
   
: check-succ (d -- )
   dup succ not if
      "@success" missing-err
   else
      "@success" over
      succ check-exec
   then
;
   
: check-fail (d -- )
   dup fail not if
      "@fail" missing-err
   else
      "@fail" over
      fail check-exec
   then
;
   
: check-drop (d -- )
   dup drop not if
      "@drop" missing-err
   else
      "@drop" over
      drop check-exec
   then
;
   
: check-osucc (d -- )
   dup osucc not if
      "@osuccess" missing-err
   else
      dup osucc ":" 1 strncmp not if
         "@osuccess" colon-err
      else pop
      then
   then
;
   
: check-ofail (d -- )
   dup ofail not if
      "@ofail" missing-err
   else
      dup ofail ":" 1 strncmp not if
         "@ofail" colon-err
      else pop
      then
   then
;
   
: check-odrop (d -- )
   dup odrop not if
      "@odrop" missing-err
   else
      dup odrop ":" 1 strncmp not if
         "@odrop" colon-err
      else pop
      then
   then
;
   
   
$define islocked? (d -- i) getlockstr "*UNLOCKED*" stringcmp $enddef
   
: islocked_always? (d -- i)
   getlockstr dup "#0" stringcmp not if pop 1 exit then
   dup "#" STRsplit swap pop atoi
   "#" swap intostr strcat
   (lockstr "#dbref")
   dup "&!" over strcat strcat
   3 pick stringcmp not if pop pop 1 exit then
   "&" over strcat strcat "!" swap strcat
   stringcmp not if 1 exit then
   0
;
   
: check-link ( d -- )
   dup getlink not if
      dup unparseobj " is unlinked." strcat .tell
   else
      dup getlink over location dbcmp if
         dup islocked? not if
            dup unparseobj
            " is linked to it's location, but is unlocked."
            strcat .tell
         then
      else (is not linked to it's location)
         dup getlink program? if
            dup dup owner swap getlink can-linkto? not if
               dup unparseobj
               " is linked to a program which is not Link_OK."
               strcat .tell
            then
         then
      then
   then
   pop
;
         
: check-room (d -- )
   dup check-desc
   dup islocked? if
      dup islocked_always? not if
         dup check-succ
      then
      dup check-fail
   then
   dup getlink if
      dup check-drop
      dup check-odrop
   then
   dup check-contents
   check-exits
;
   
: check-exit ( d -- )
   dup check-link
   dup check-desc
   dup getlink dup ok? if
      program? not if
         dup islocked_always? not if
            dup check-succ
            dup check-osucc
            dup check-odrop
         then
         dup islocked? if
            dup check-fail
            dup check-ofail
         then
      then
   else pop
   then
   pop
;
   
: check-thing ( d -- )
   dup check-desc
   dup islocked_always? not if
      dup check-succ
      dup check-osucc
   then
   dup islocked? if
      dup check-fail
      dup check-ofail
   then
   dup check-drop
   dup check-odrop
   check-exits
;
   
: check-player ( d -- )
   dup check-desc
   dup islocked_always? not if
      dup check-succ
      dup check-osucc
   then
   dup islocked? if
      dup check-fail
      dup check-ofail
   then
   dup check-contents
   check-exits
;
   
: check-program ( d -- )
   check-desc
;
   
: check-obj (d -- )
   dup room?   if check-room   exit then
   dup exit?   if check-exit   exit then
   dup thing?  if check-thing  exit then
   dup player? if check-player exit then
   check-program
;
   
: main
   'check-obj check-obj-addr !
   .strip dup not if pop "here" then
   .match_controlled
   dup #-3 dbcmp if pop me @ getlink then
   dup ok? not if pop exit then
   check-obj
   me @ "Check done." notify
;

Example from hello-world:

: main
    me @ "Hello World" notify
;

Language features

Feature	Supported	Example	Token
Strings	✓	"Hello world"	"