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Annotation of gforth/search-order.fs, revision 1.2

1.1       anton       1: \ search order wordset                                 14may93py
                      2: 
                      3: $10 constant maxvp
                      4: Variable vp
                      5:   0 A, 0 A,  0 A, 0 A,   0 A, 0 A,   0 A, 0 A, 
                      6:   0 A, 0 A,  0 A, 0 A,   0 A, 0 A,   0 A, 0 A, 
                      7: 
                      8: : get-current  ( -- wid )  current @ ;
                      9: : set-current  ( wid -- )  current ! ;
                     10: 
                     11: : context ( -- addr )  vp dup @ cells + ;
                     12: : definitions  ( -- )  context @ current ! ;
                     13: 
                     14: \ wordlist Vocabulary also previous                    14may93py
                     15: 
                     16: AVariable voclink
                     17: 
                     18: : wordlist  ( -- wid )
                     19:   here  0 A, Forth-wordlist cell+ @ A, voclink @ A, 0 A,
                     20:   dup 2 cells + voclink ! ;
                     21: 
                     22: : Vocabulary ( -- ) Create wordlist drop  DOES> context ! ;
                     23: 
                     24: : also  ( -- )
                     25:   context @ vp @ 1+ dup maxvp > abort" Vocstack full"
                     26:   vp ! context ! ;
                     27: 
                     28: : previous ( -- )  vp @ 1- dup 0= abort" Vocstack empty" vp ! ;
                     29: 
                     30: \ vocabulary find                                      14may93py
                     31: 
1.2     ! anton      32: : (vocfind)  ( addr count nfa1 -- nfa2|false )
        !            33:     \ !! generalize this to be independent of vp
        !            34:     drop 1 vp @
        !            35:     DO  2dup vp I cells + @ (search-wordlist) dup
        !            36:        IF  nip nip
        !            37:            UNLOOP EXIT
        !            38:        THEN  drop
        !            39:     -1 +LOOP
        !            40:     2drop false ;
        !            41: 
        !            42: 0 value locals-wordlist
        !            43: 
        !            44: : (localsvocfind)  ( addr count nfa1 -- nfa2|false )
        !            45:     \ !! use generalized (vocfind)
        !            46:     drop locals-wordlist
        !            47:     IF 2dup locals-wordlist (search-wordlist) dup
        !            48:        IF nip nip
        !            49:            EXIT
        !            50:        THEN drop
        !            51:     THEN
        !            52:     0 (vocfind) ;
        !            53: 
        !            54: \ In the kernal the dictionary search works on only one wordlist.
        !            55: \ The following stuff builds a thing that looks to the kernal like one
        !            56: \ wordlist, but when searched it searches the whole search order
        !            57: \  (including locals)
1.1       anton      58: 
1.2     ! anton      59: \ this is the wordlist-map of the dictionary
        !            60: Create vocsearch       ' (localsvocfind) A, ' (reveal) A,
1.1       anton      61: 
                     62: \ Only root                                            14may93py
                     63: 
1.2     ! anton      64: wordlist \ the wordlist structure
        !            65: vocsearch over cell+ A! \ patch the map into it
1.1       anton      66: 
                     67: Vocabulary Forth
                     68: Vocabulary Root
                     69: 
                     70: : Only  vp off  also Root also definitions ;
                     71: 
                     72: \ set initial search order                             14may93py
                     73: 
                     74: Forth-wordlist @ ' Forth >body A!
                     75: 
                     76: Only Forth also definitions
                     77: 
1.2     ! anton      78: search A! \ our dictionary search order becomes the law
1.1       anton      79: 
                     80: \ get-order set-order                                  14may93py
                     81: 
                     82: : get-order  ( -- wid1 .. widn n )
                     83:   vp @ 0 ?DO  vp cell+ I cells + @  LOOP  vp @ ;
                     84: 
                     85: : set-order  ( wid1 .. widn n / -1 -- )
                     86:   dup -1 = IF  drop Only exit  THEN  dup vp !
                     87:   ?dup IF  1- FOR  vp cell+ I cells + !  NEXT  THEN ;
                     88: 
                     89: : seal ( -- )  context @ 1 set-order ;
                     90: 
                     91: \ words visible in roots                               14may93py
                     92: 
                     93: : .name ( name -- ) name>string type space ;
                     94: : words  cr 0 context @
                     95:   BEGIN  @ dup  WHILE  2dup cell+ c@ $1F and 2 + dup >r +
                     96:          &79 >  IF  cr nip 0 swap  THEN
                     97:          dup .name space r> rot + swap  REPEAT 2drop ;
                     98: 
                     99: : body> ( data -- cfa )  0 >body - ;
                    100: 
                    101: : .voc  body> >name .name ;
                    102: : order  1 vp @  DO  vp I cells + @ .voc  -1 +LOOP  2 spaces
                    103:   current @ .voc ;
                    104: : vocs   voclink  BEGIN  @ dup @  WHILE  dup 2 cells - .voc  REPEAT  drop ;
                    105: 
                    106: Root definitions
                    107: 
                    108: ' words Alias words
                    109: ' Forth Alias Forth
                    110: 
                    111: Forth definitions