obp/obp/fm/lib/th.fth

\ ========== Copyright Header Begin ==========================================
\
\ Hypervisor Software File: th.fth
\
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\ ========== Copyright Header End ============================================
\ id: @(#)th.fth 2.6 96/06/04
\ Copyright 1985-1990 Bradley Forthware
\ Modified by  M.Milendorf
\ and again by Tayfun.
\ Copied over by Dave Redman from Tayfun's tree.
\
\ Temporary hex, and temporary decimal.  "h#" interprets the next word
\ as though the base were hex, regardless of what the base happens to be.
\ "d#" interprets the next word as though the base were decimal.
\ "o#" interprets the next word as though the base were octal.
\ "b#" interprets the next word as though the base were binary.

\  Also, words to stash and set, and retrieve, the base during execution
\     of a word in which they're used.  The words of the form  push-<base>
\     (where <base> is hex, decimal, etcetera) does the equivalent of
\     base @ >r <base>     The word  pop-base  recovers the old base...

decimal
: #:  \ name  ( base -- )  \ Define a temporary-numeric-mode word
   create c, immediate
   does>
      base @ >r  c@ base !
      parse-word
      2dup 2>r  $handle-literal?  0=  if
         2r@  $compile
      then
      2r> 2drop
      r> base !
;

\ The old names; use h# and d# instead
10 #: td
16 #: th

: push-base:  \ name   ( base -- )  \  Define a base stash-and-set word
   create c,
   does>  r> base @ >r >r c@ base !
;

\ Stash the old base on the return stack and set the base to ...
10 push-base:  push-decimal
16 push-base:  push-hex

 2 push-base:  push-binary
 8 push-base:  push-octal

\ Retrieve the old base from the return stack
: pop-base ( -- )  r> r> base ! >r ;

headers

 2 #: b#        \ Binary number
 8 #: o#        \ Octal number
10 #: d#        \ Decimal number
16 #: h#        \ Hex number

headers