Annotation of gforth/compat/anslocal.fs, revision 1.3
1.1 anton 1: \ This implements a subset of the gforth locals syntax in pure ANS Forth
2:
3: \ This file is in the public domain. NO WARRANTY.
4:
5: \ This implementation technique has been described by John Hayes in
6: \ the SigForth Newsletter 4(2), Fall '92. He did not do the complete
7: \ job, but left some more mundane parts as an exercise to the reader.
8:
9: \ I don't implement the "|" part, because 1) gforth does not implement
10: \ it and 2) it's unnecessary; just put a 0 before the "{" for every
11: \ additional local you want to declare.
12:
1.3 ! anton 13: \ The program uses the following words
! 14: \ from CORE :
! 15: \ : bl word count ; >in @ 2dup 0= IF 2drop [char] ELSE THEN drop
! 16: \ recurse swap ! immediate
! 17: \ from CORE-EXT :
! 18: \ parse true
! 19: \ from BLOCK-EXT :
! 20: \ \
! 21: \ from FILE :
! 22: \ ( S"
! 23: \ from LOCAL :
! 24: \ (local)
! 25: \ from STRING :
! 26: \ compare
1.1 anton 27:
28: : local ( "name" -- )
29: bl word count (local) ;
30:
31: : {helper ( -- final-offset )
32: >in @
1.2 anton 33: bl word count
1.1 anton 34: 2dup s" --" compare 0= if
35: 2drop [char] } parse 2drop true
36: else
37: s" }" compare 0=
38: then
39: if
40: drop >in @
41: else
42: recurse
43: swap >in ! local
44: then ;
45:
46: : { ( -- )
47: {helper >in ! 0 0 (local) ; immediate
48:
49: \ : test-swap { a b -- b a } ." xxx"
50: \ b a ;
51:
52: \ 1 2 test-swap . . .s cr
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