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File:  [gforth] / gforth / compat / anslocal.fs
Revision 1.3: download - view: text, annotated - select for diffs
Fri Jun 6 17:28:12 1997 UTC (25 years ago) by anton
Branches: MAIN
CVS tags: v0-7-0, v0-6-2, v0-6-1, v0-6-0, v0-5-0, v0-4-0, HEAD
Environmental query "gforth" now returns the version-string
dictionary-end and unused moved into the kernel/basics.fs
Minor gforth.el bug fixes
Major rewrite of objects.fs (not yet done)
fixed -trailing bug (with test in test/other.fs)
optimization of fields with offset 0 in struct.fs and compat/struct.fs
other changes in compat/struct.fs (not yet done)
added ansreports to compat/*.fs
documentation changes
allot now checks for dict overflow
named [IS] (compilation semantics of IS).
minor changes

    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: 
   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 
   27: 
   28: : local ( "name" -- )
   29:     bl word count (local) ;
   30: 
   31: : {helper ( -- final-offset )
   32:     >in @
   33:     bl word count
   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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