[pforth] / fth / locals.fth

\ @(#) $M$ 98/01/26 1.2
\ standard { v0 v1 ... vn | l0 l1 .. lm -- } syntax
\ based on ANSI basis words (LOCAL) and TO
\
\ Author: Phil Burk
\ Copyright 1994 3DO, Phil Burk, Larry Polansky, David Rosenboom
\
\ The pForth software code is dedicated to the public domain,
\ and any third party may reproduce, distribute and modify
\ the pForth software code or any derivative works thereof
\ without any compensation or license.  The pForth software
\ code is provided on an "as is" basis without any warranty
\ of any kind, including, without limitation, the implied
\ warranties of merchantability and fitness for a particular
\ purpose and their equivalents under the laws of any jurisdiction.

\ MOD: PLB 2/11/00 Allow EOL and \ between { }.

anew task-locals.fth

private{
variable loc-temp-mode    \ if true, declaring temporary variables
variable loc-comment-mode \ if true, in comment section
variable loc-done
}private

: { ( <local-declaration}> -- )
   loc-done off
   loc-temp-mode off
   loc-comment-mode off
   BEGIN
       bl word count
       dup 0>           \ make sure we are not at the end of a line
       IF
           over c@
           CASE
   \ handle special characters
           ascii }  OF  loc-done on          2drop  ENDOF
           ascii |  OF  loc-temp-mode on     2drop  ENDOF
           ascii -  OF  loc-comment-mode on  2drop  ENDOF
           ascii )  OF  ." { ... ) imbalance!" cr abort  ENDOF
           ascii \  OF  postpone \  2drop ENDOF   \ Forth comment

   \ process name
           >r  ( save char )
           ( addr len )
           loc-comment-mode @
           IF
               2drop
           ELSE
   \ if in temporary mode, assign local var = 0
               loc-temp-mode @
               IF compile false
               THEN
   \ otherwise take value from stack
               (local)
           THEN
           r>
           ENDCASE
       ELSE
           2drop refill 0= abort" End of input while defining local variables!"
       THEN
       loc-done @
   UNTIL
   0 0 (local)
; immediate

privatize

\ tests
: tlv1  { n -- }  n  dup n *  dup n *  ;

: tlv2 { v1 v2 | l1 l2 -- }
   v1 . v2 . cr
   v1 v2 + -> l1
   l1 . l2 . cr
;