Annotation of gforth/compat/anslocal.fs, revision 1.2

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: 
                     13: \ This program uses PARSE from the core ext and COMPARE from the
                     14: \ string wordsets
                     15: 
                     16: : local ( "name" -- )
                     17:     bl word count (local) ;
                     18: 
                     19: : {helper ( -- final-offset )
                     20:     >in @
1.2     ! anton      21:     bl word count
1.1       anton      22:     2dup s" --" compare 0= if
                     23:        2drop [char] } parse 2drop true
                     24:     else
                     25:        s" }" compare 0=
                     26:     then
                     27:     if
                     28:        drop >in @
                     29:     else
                     30:        recurse
                     31:        swap >in ! local
                     32:     then ;
                     33: 
                     34: : { ( -- )
                     35:     {helper >in ! 0 0 (local) ; immediate
                     36: 
                     37: \ : test-swap { a b -- b a } ." xxx"
                     38: \     b a ;
                     39: 
                     40: \ 1 2 test-swap . . .s cr

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