Annotation of gforth/hash.fs, revision 1.4
1.1 pazsan 1: \ Hashed dictionaries 15jul94py
2:
1.4 ! pazsan 3: 9 value hashbits
1.2 anton 4: 1 hashbits lshift Value Hashlen
1.1 pazsan 5:
6: Variable insRule insRule on
1.4 ! pazsan 7: Variable revealed
1.1 pazsan 8:
1.4 ! pazsan 9: \ Memory handling 10oct94py
1.1 pazsan 10:
11: Variable HashPointer
1.4 ! pazsan 12: Variable HashTable
! 13: Variable HashIndex
1.1 pazsan 14:
1.4 ! pazsan 15: \ DelFix and NewFix are from bigFORTH 15jul94py
1.1 pazsan 16:
17: : DelFix ( addr root -- ) dup @ 2 pick ! ! ;
18: : NewFix ( root len # -- addr )
19: BEGIN 2 pick @ ?dup 0= WHILE 2dup * allocate throw
20: over 0 ?DO dup 4 pick DelFix 2 pick + LOOP drop
21: REPEAT >r drop r@ @ rot ! r@ swap erase r> ;
22:
23: \ compute hash key 15jul94py
24:
1.2 anton 25: : hash ( addr len -- key )
26: hashbits (hashkey1) ;
27: \ (hashkey)
28: \ Hashlen 1- and ;
1.1 pazsan 29:
1.2 anton 30:
31: : hash-find ( addr len wordlist -- nfa / false )
32: $C + @ >r
1.4 ! pazsan 33: 2dup hash r> xor cells HashTable @ + @ (hashfind) ;
1.1 pazsan 34:
35: \ hash vocabularies 16jul94py
36:
37: : lastlink! ( addr link -- )
38: BEGIN dup @ dup WHILE nip REPEAT drop ! ;
39:
40: : (reveal ( addr voc -- ) $C + dup @ 0< IF 2drop EXIT THEN
1.4 ! pazsan 41: @ over cell+ count $1F and Hash xor cells >r
1.1 pazsan 42: HashPointer 8 $400 NewFix
1.4 ! pazsan 43: tuck cell+ ! r> HashTable @ + insRule @
! 44: IF dup @ 2 pick ! ! ELSE lastlink! THEN revealed on ;
1.1 pazsan 45:
46: : hash-reveal ( -- ) (reveal) last? IF
47: current @ (reveal THEN ;
48:
1.4 ! pazsan 49: : addall ( -- )
! 50: voclink
! 51: BEGIN @ dup @ WHILE dup 'initvoc REPEAT drop ;
! 52:
! 53: : clearhash ( -- )
! 54: HashTable @ Hashlen cells bounds
! 55: DO I @
! 56: BEGIN dup WHILE
! 57: dup @ swap HashPointer DelFix
! 58: REPEAT I !
! 59: cell +LOOP HashIndex off ;
! 60:
! 61: : rehash clearhash addall ;
! 62: : (rehash) ( addr -- )
! 63: drop revealed @ IF rehash revealed off THEN ;
! 64:
! 65: Create hashsearch ' hash-find A, ' hash-reveal A, ' (rehash) A,
! 66:
! 67: \ hash allocate and vocabulary initialization 10oct94py
! 68:
! 69: : hash-alloc ( addr -- addr ) HashTable @ 0= IF
! 70: Hashlen cells allocate throw HashTable !
! 71: HashTable @ Hashlen cells erase THEN
! 72: HashIndex @ over ! 1 HashIndex +!
! 73: HashIndex @ Hashlen >=
! 74: IF clearhash
! 75: 1 hashbits 1+ dup to hashbits lshift to hashlen
! 76: HashTable @ free
! 77: addall
! 78: THEN ;
1.1 pazsan 79:
1.4 ! pazsan 80: : (initvoc) ( addr -- )
1.2 anton 81: cell+ dup @ 0< IF drop EXIT THEN
82: insRule @ >r insRule off hash-alloc
83: 3 cells - hashsearch over cell+ ! dup
84: BEGIN @ dup WHILE 2dup swap (reveal REPEAT
85: 2drop r> insRule ! ;
1.1 pazsan 86:
1.4 ! pazsan 87: ' (initvoc) IS 'initvoc
1.1 pazsan 88:
89: \ Hash-Find 01jan93py
90:
91: addall \ Baum aufbauen
92: \ Baumsuche ist installiert.
93:
94: : .words ( -- )
1.4 ! pazsan 95: base @ >r hex HashTable @ Hashlen 0
! 96: DO cr i 2 .r ." : " dup i cells +
1.1 pazsan 97: BEGIN @ dup WHILE
98: dup cell+ @ .name REPEAT drop
99: LOOP drop r> base ! ;
100:
1.2 anton 101: \ \ this stuff is for evaluating the hash function
102: \ : square dup * ;
103:
104: \ : countwl ( -- sum sumsq )
1.4 ! pazsan 105: \ \ gives the number of words in the current wordlist
! 106: \ \ and the sum of squares for the sublist lengths
1.2 anton 107: \ 0 0
1.4 ! pazsan 108: \ hashtable @ Hashlen cells bounds DO
! 109: \ 0 i BEGIN
! 110: \ @ dup WHILE
! 111: \ swap 1+ swap
! 112: \ REPEAT
! 113: \ drop
! 114: \ swap over square +
! 115: \ >r + r>
! 116: \ 1 cells
! 117: \ +LOOP ;
1.2 anton 118:
119: \ : chisq ( -- n )
1.4 ! pazsan 120: \ \ n should have about the same size as Hashlen
! 121: \ countwl Hashlen 2 pick */ swap - ;
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