refactor iterator definitions to define a "blank" iterator, which is then

modified by subsequent definitions.

iter.jrt

@@ -57,6 +57,7 @@ nexttop :drop nextdrop
 nexttop :ndrop n-nextdrop
 
 : iterdrop ( n-next -- ) n-nextdrop idrop ;
+: 1-iterdrop nextdrop idrop ; 
 
 { : :push ( pixp -- )
 :ASM >r
@@ -134,6 +135,9 @@ nexttop :push >next
 : iterate 0 nextpeek @ execute ;
 : cancel 0 nextpeek cell + @ execute ;
 
+: finished ( -- 0 ) cancel 0 ;
+: finish? ( f -- f ) if 1 else finished then ;
+
 : EACH_ <r iterate if cell + else @ then >r ;
 
 { ( Because we dereference pointers on the return stack, we must run this 
@@ -146,42 +150,48 @@ nexttop :push >next
   : CONTINUE t, GOTO_ i cell - w>t ;
   :timm continue CONTINUE ;
   :timm next CONTINUE <i patch!t ;
-  : iter, ( xt-iter xt-cancel -- iter ) target >i swap w>t w>t ; 
-  :timm >iter <i compilenum t, >next ; }
+  : blankiter, t' finished w>t t' 1-iterdrop w>t ; }
 
-: finished ( -- 0 ) cancel 0 ;
-: finish? ( f -- f ) if 1 else finished then ;
+{ : defiter CREATE blankiter, DOES} >next ;
+{ : :iter CREATE blankiter, startcolon DOES} 
+  >r r@ [ 2 cells lit ] + execute <r >next ;
 
-( n ) ' finished ( c ) :noname nextdrop cancel ; iter, : >cancel >iter ;
+{ : iter! ( val off -- ) cells latest entry>tcp + !t ;
+  : next! 2 iter! ;                 : cancel! 3 iter! ;
+  : :next target next! startcolon ; : :cancel target cancel! startcolon ; }
+
+defiter >cancel 
+:cancel nextdrop cancel ;
 
 { : break ' >cancel , ['] continue ; immediate
   :timm break t, >cancel CONTINUE ; }
 
-( n ) ' 0 ( c ) ' nextdrop iter, 
-: nothing >iter ;
+defiter nothing
+' nextdrop cancel!
 
-: 1cancel idrop nextdrop ; 
+defiter >single-done
+:iter single >i ;
+:next nextdrop 1 >single-done ;
 
-( n ) ' finished ( c ) ' 1cancel iter, 
-( n ) :noname nextdrop 1 >iter ; ( c ) ' 1cancel iter, 
-: single >i >iter ;
+:iter times ( n -- ) >i ;
+:next <i dup 1- >i finish? ;
 
-( n ) :noname <i dup 1- >i finish? ; ( c ) ' 1cancel iter,
-: times ( n -- ) >i >iter ;
-
-( n ) :noname <i @ dup >i finish? ; ( c ) ' 1cancel iter,
-: links ( p -- ) dup if >i >iter else nothing then ;
+defiter >links
+:next <i @ dup >i finish? ;
+: links ( p -- ) dup if >i >links else nothing then ;
 
 : +for? ( n -- f ) <i + dup >i 1 nextpeek != finish? ;
 
-( n ) :noname 1 +for? ; ( c ) :noname 2 iterdrop ; iter,
-: for ( start lim -- ) >next 1- >i >iter ;
+:iter for ( start lim -- ) >next 1- >i ;
+:next 1 +for? ;
+:cancel 2 iterdrop ;
 
-( n ) :noname 2 nextpeek +for? ; ( c ) :noname 3 iterdrop ; iter,
-: for+ ( start lim inc -- ) >next >next 1 nextpeek - >i >iter ;
+:iter for+ ( start lim inc -- ) >next >next 1 nextpeek - >i ;
+:next 2 nextpeek +for? ;
+:cancel 3 iterdrop ;
 
-( n ) :noname <i 1+ dup >i b@ finish? ; ( c ) ' 1cancel iter, 
-: pchars ( st -- ) 1- >i >iter ;
+:iter pchars ( st -- ) 1- >i ;
+:next <i 1+ dup >i b@ finish? ;
 
 : nth ( i -- v ) 0 each 2dup = if drop i break then 1+ next swap drop ;
 : count 0 each 1+ next ;
@@ -228,8 +238,10 @@ nexttop :push >next
   rswap _suspend>args n->next 2r>next 1 ;
 : _cancel _resume>args n-nextdrop rdrop ;
 
-( n ) :noname _resume>args n-<next ; ( c ) ' _cancel iter,
-: GENSTART_ <r >next >iter ;
+defiter >genstart
+:next _resume>args n-<next ;
+' _cancel cancel!
+: GENSTART_ <r >next >genstart ;
 
 ( yielding from a generator has three moving parts:
   suspend: run immediately when the generator yields. takes care of updating

zipoff.jrt

@@ -129,7 +129,8 @@ s" coredefs.jrt" loadfile
 
 dbg" CREATE"
 : CREATE DEF t& $DOCREATE w>t 0 w>t ;
-: FINISHCREATE ' latest ' tdict with-dict codepointer cell + @ cell + !t ;
+: entry>tcp codepointer cell + @ ;
+: FINISHCREATE ' latest ' tdict with-dict entry>tcp cell + !t ;
 : DOES} target lit ' FINISHCREATE , ' return , } ; immediate
 
 ( s" blah.jrt" loadfile doesn't work in target mode because s" writes