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Diff for /gforth/hash.fs between versions 1.3 and 1.17

version 1.3, 1994/09/12 19:00:31 version 1.17, 1996/11/15 21:19:29
Line 1 Line 1
 \ Hashed dictionaries                                  15jul94py  \ Hashed dictionaries                                  15jul94py
   
 7 value hashbits  \ Copyright (C) 1995 Free Software Foundation, Inc.
   
   \ This file is part of Gforth.
   
   \ Gforth is free software; you can redistribute it and/or
   \ modify it under the terms of the GNU General Public License
   \ as published by the Free Software Foundation; either version 2
   \ of the License, or (at your option) any later version.
   
   \ This program is distributed in the hope that it will be useful,
   \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   \ GNU General Public License for more details.
   
   \ You should have received a copy of the GNU General Public License
   \ along with this program; if not, write to the Free Software
   \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   
   11 value hashbits
 1 hashbits lshift Value Hashlen  1 hashbits lshift Value Hashlen
   
 Variable insRule        insRule on  Variable insRule        insRule on
   Variable revealed
   
 \ Memory handling                                      15jul94py  \ Memory handling                                      10oct94py
   
 Variable HashPointer  Variable HashPointer
   Variable HashIndex
   0 Value HashTable
   
 : hash-alloc ( addr -- addr )  dup @ 0= IF  \ DelFix and NewFix are from bigFORTH                  15jul94py
   Hashlen cells allocate throw over !  
   dup @ Hashlen cells erase THEN ;  
   
 \ DelFix and NewFix is from bigFORTH                   15jul94py  
   
 : DelFix ( addr root -- ) dup @ 2 pick ! ! ;  : DelFix ( addr root -- ) dup @ 2 pick ! ! ;
 : NewFix  ( root len # -- addr )  : NewFix  ( root len # -- addr )
Line 28  Variable HashPointer Line 45  Variable HashPointer
 \   (hashkey)  \   (hashkey)
 \   Hashlen 1- and ;  \   Hashlen 1- and ;
   
   : bucket ( addr len wordlist -- bucket-addr )
       \ @var{bucket-addr} is the address of a cell that points to the first
       \ element in the list of the bucket for the string @var{addr len}
       wordlist-extend @ -rot hash xor ( bucket# )
       cells HashTable + ;
   
 : hash-find ( addr len wordlist -- nfa / false )  : hash-find ( addr len wordlist -- nfa / false )
     $C + @ >r      >r 2dup r> bucket @ (hashfind) ;
     2dup hash cells r> + @ (hashfind) ;  
   
 \ hash vocabularies                                    16jul94py  \ hash vocabularies                                    16jul94py
   
 : lastlink! ( addr link -- )  : lastlink! ( addr link -- )
   BEGIN  dup @ dup  WHILE  nip  REPEAT  drop ! ;    BEGIN  dup @ dup  WHILE  nip  REPEAT  drop ! ;
   
 : (reveal ( addr voc -- )  $C + dup @ 0< IF  2drop EXIT  THEN  : (reveal ( nfa wid -- )
   hash-alloc @ over cell+ count $1F and Hash cells + >r      dup wordlist-extend @ 0<
   HashPointer 8 $400 NewFix      IF
   tuck cell+ ! r> insRule @          2drop EXIT
   IF  dup @ 2 pick ! !  ELSE  lastlink!  THEN ;      THEN
       over name>string rot bucket >r
 : hash-reveal ( -- )  (reveal) last?  IF      HashPointer 2 Cells $400 NewFix
   current @ (reveal  THEN ;      tuck cell+ ! r> insRule @
       IF
 Create hashsearch  ' hash-find A,  ' hash-reveal A,  ' drop A,          dup @ 2 pick ! !
       ELSE
 : (initvoc ( addr -- )          lastlink!
     cell+ dup @ 0< IF  drop EXIT  THEN      THEN
     insRule @ >r  insRule off  hash-alloc      revealed on ;
     3 cells - hashsearch over cell+ ! dup  
     BEGIN  @ dup  WHILE  2dup swap (reveal  REPEAT  
     2drop  r> insRule ! ;  
   
 ' (initvoc IS 'initvoc  : hash-reveal ( nfa wid -- )
       2dup (reveal) (reveal ;
   
 : addall  ( -- )  : addall  ( -- )
     voclink      voclink
     BEGIN  @ dup @  WHILE  dup (initvoc  REPEAT  drop ;      BEGIN  @ dup @  WHILE  dup 'initvoc  REPEAT  drop ;
   
   : clearhash  ( -- )
       HashTable Hashlen cells bounds
       DO  I @
           BEGIN  dup  WHILE
                  dup @ swap HashPointer DelFix
           REPEAT  I !
       cell +LOOP  HashIndex off ;
   
   : re-hash  clearhash addall ;
   : (rehash) ( addr -- )
     drop revealed @ IF  re-hash revealed off  THEN ;
   
   Create hashsearch-map ( -- wordlist-map )
       ' hash-find A, ' hash-reveal A, ' (rehash) A,
   
   \ hash allocate and vocabulary initialization          10oct94py
   
   : hash-alloc ( addr -- addr )  HashTable 0= IF
     Hashlen cells allocate throw TO HashTable
     HashTable Hashlen cells erase THEN
     HashIndex @ over !  1 HashIndex +!
     HashIndex @ Hashlen >=
     IF  HashTable >r clearhash
         1 hashbits 1+ dup  to hashbits  lshift  to hashlen
         r> free >r  0 to HashTable
         addall r> throw
     THEN ;
   
   : (initvoc) ( addr -- )
       cell+ dup @  0< IF  drop EXIT  THEN
       dup 2 cells - @ hashsearch-map <> IF  drop EXIT  THEN
       insRule @ >r  insRule off  hash-alloc 3 cells - dup
       BEGIN  @ dup  WHILE  2dup swap (reveal  REPEAT
       2drop  r> insRule ! ;
   
   ' (initvoc) IS 'initvoc
   
 \ Hash-Find                                            01jan93py  \ Hash-Find                                            01jan93py
   
 addall          \ Baum aufbauen  : make-hash
 \ Baumsuche ist installiert.    Root   hashsearch-map context @ cell+ !
     Forth  hashsearch-map context @ cell+ !
     addall          \ Baum aufbauen
   ;
   
   make-hash  \ Baumsuche ist installiert.
   
   : hash-cold  ( -- ) Defers 'cold
     HashPointer off  0 TO HashTable  HashIndex off
     voclink
     BEGIN  @ dup @  WHILE
            dup cell - @ >r
            dup 'initvoc
            r> over cell - !
     REPEAT  drop ;
   ' hash-cold ' 'cold >body !
   
 : .words  ( -- )  : .words  ( -- )
   base @ >r hex context @ 3 cells +  HashLen 0    base @ >r hex HashTable  Hashlen 0
   DO  cr  i 2 .r ." : " dup @ i cells +    DO  cr  i 2 .r ." : " dup i cells +
       BEGIN  @ dup  WHILE        BEGIN  @ dup  WHILE
              dup cell+ @ .name  REPEAT  drop               dup cell+ @ .name  REPEAT  drop
   LOOP  drop r> base ! ;    LOOP  drop r> base ! ;
Line 78  addall          \ Baum aufbauen Line 149  addall          \ Baum aufbauen
 \ : square dup * ;  \ : square dup * ;
   
 \ : countwl  ( -- sum sumsq )  \ : countwl  ( -- sum sumsq )
 \     \ gives the number of words in the current wordlist and the sum of  \     \ gives the number of words in the current wordlist
 \     \ squares for the sublist lengths  \     \ and the sum of squares for the sublist lengths
 \     0 0  \     0 0
 \     context @ 3 cells + @ hashlen cells over + swap DO  \     hashtable Hashlen cells bounds DO
 \       0 i BEGIN  \        0 i BEGIN
 \           @ dup WHILE  \            @ dup WHILE
 \           swap 1+ swap  \            swap 1+ swap
 \       REPEAT  \        REPEAT
 \       drop  \        drop
 \       swap over square +  \        swap over square +
 \       >r + r>  \        >r + r>
 \       1 cells  \        1 cells
 \     +LOOP ;  \    +LOOP ;
   
 \ : chisq ( -- n )  \ : chisq ( -- n )
 \     \ n should have about the same size as hashlen  \     \ n should have about the same size as Hashlen
 \     countwl hashlen 2 pick */ swap - ;  \     countwl Hashlen 2 pick */ swap - ;
Removed from v.1.3  
changed lines
  Added in v.1.17

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