forth: add words "[" and "]"

forth/core.fs

@@ -1,7 +1,8 @@
 : H@ HERE @ ;
 : -^ SWAP - ;
-: [LITN] LITN ; IMMEDIATE
-: LIT ROUTINE S [LITN] , ;
+: [ INTERPRET 1 FLAGS ! ; IMMEDIATE
+: ] R> DROP ;
+: LIT [ ROUTINE S LITN ] , ;
 : LITS LIT SCPY ;
 : LIT< WORD LITS ; IMMEDIATE
 : _err LIT< word-not-found (print) ABORT ;
@@ -48,9 +49,9 @@
 ; IMMEDIATE
 
 : CREATE
-    (entry)          ( empty header with name )
-    ROUTINE C [LITN] ( push cellWord addr )
-    ,                ( write it )
+    (entry)            ( empty header with name )
+    [ ROUTINE C LITN ] ( push cellWord addr )
+    ,                  ( write it )
 ;
 : VARIABLE CREATE 2 ALLOT ;
 : CONSTANT CREATE H@ ! DOES> @ ;
@@ -86,7 +87,7 @@
 
 : (sysv)
     (entry)
-    ROUTINE Y [LITN] ,
+    [ ROUTINE Y LITN ] ,
     SYSVNXT @ ,
     2 SYSVNXT +!
 ;

forth/dictionary.txt

@@ -52,7 +52,6 @@ DOES>       --              See description at top of file
 IMMED?      a -- f          Checks whether wordref at a is immediate.
 IMMEDIATE   --              Flag the latest defined word as immediate.
 LITN        n --            Write number n as a literal.
-[LITN]      n --            *I* Immediate version of LITN.
 ROUTINE x   -- a            Push the addr of the specified core routine
                             C=cellWord J=JUMPTBL V=nativeWord N=next S=LIT
                             M=NUMBER Y=sysvarWord D=doesWord
@@ -81,6 +80,10 @@ input stream is executed immediately. In this context, branching doesn't work.
                             atom's cell.
 (bbr)       --              Branches backward by the number specified in its
                             atom's cell.
+[           --              Begin interetative mode. In a definition, words
+                            between here and "]" will be executed instead of
+                            compiled.
+]           --              End interpretative mode.
 ABORT       --              Resets PS and RS and returns to interpreter
 ABORT" x"   --              *I* Compiles a ." followed by a ABORT.
 AGAIN       I:a --          *I* Jump backwards to preceeding BEGIN.

forth/z80a.fs

@@ -222,16 +222,16 @@
 0x10 OPJR DJNZe,
 
 ( Specials )
-: JPNEXT, ROUTINE N [LITN] JPnn, ;
+: JPNEXT, [ ROUTINE N LITN ] JPnn, ;
 
 : CODE
     ( same as CREATE, but with ROUTINE V )
     (entry)
-    ROUTINE V [LITN] ,
+    [ ROUTINE V LITN ] ,
 ;
 
 : ;CODE JPNEXT, ;
 
 
 ( Routines )
-: chkPS, ROUTINE P [LITN] CALLnn, ;
+: chkPS, [ ROUTINE P LITN ] CALLnn, ;