xref: /freebsd-9.3-release/sys/boot/ficl/softwords/prefix.fr

\ ** 
\ ** Prefix words for ficl
\ ** submitted by Larry Hastings, larry@hastings.org
\ **
\ (jws) To make a prefix, simply create a new definition in the <prefixes> 
\ wordlist. start-prefixes and end-prefixes handle the bookkeeping
\
\ $FreeBSD$

variable save-current

: start-prefixes   get-current save-current ! <prefixes> set-current ;
: end-prefixes     save-current @ set-current ;
: show-prefixes    <prefixes> >search  words  search> drop ;

\ #if (FICL_EXTENDED_PREFIX)

start-prefixes

\ define " (double-quote) as an alias for s", and make it a prefix
: " postpone s" ; immediate


\ make .( a prefix (we just create an alias for it in the prefixes list)
: .( postpone .( ; immediate


\ make \ a prefix, and add // (same thing) as a prefix too
\ (jws) "//" is precompiled to save aggravation with Perl
\ : // postpone \ ; immediate


\ ** add 0b, 0o, 0d, and 0x as prefixes 
\ ** these temporarily shift the base to 2, 8, 10, and 16 respectively
\ ** and consume the next number in the input stream, pushing/compiling
\ ** as normal

\ (jws) __tempbase is precompiled, as are 0x and 0d - see prefix.c
\
\ : __tempbase  { newbase | oldbase -- }
\   base @ to oldbase 
\   newbase base !
\   0 0 parse-word >number 2drop drop
\   oldbase base !
\   ;

: 0b  2 __tempbase ; immediate

: 0o  8 __tempbase ; immediate

\ : 0d 10 __tempbase ; immediate
\ "0d" add-prefix

\ : 0x 16 __tempbase ; immediate
\ "0x" add-prefix

end-prefixes

\ #endif