60 lines
1.4 KiB
Forth
60 lines
1.4 KiB
Forth
\ **
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\ ** Prefix words for ficl
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\ ** submitted by Larry Hastings, larry@hastings.org
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\ **
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\ (jws) To make a prefix, simply create a new definition in the <prefixes>
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\ wordlist. start-prefixes and end-prefixes handle the bookkeeping
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\
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\ $FreeBSD$
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variable save-current
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: start-prefixes get-current save-current ! <prefixes> set-current ;
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: end-prefixes save-current @ set-current ;
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: show-prefixes <prefixes> >search words search> drop ;
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\ #if (FICL_EXTENDED_PREFIX)
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start-prefixes
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\ define " (double-quote) as an alias for s", and make it a prefix
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: " postpone s" ; immediate
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\ make .( a prefix (we just create an alias for it in the prefixes list)
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: .( postpone .( ; immediate
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\ make \ a prefix, and add // (same thing) as a prefix too
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\ (jws) "//" is precompiled to save aggravation with Perl
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\ : // postpone \ ; immediate
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\ ** add 0b, 0o, 0d, and 0x as prefixes
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\ ** these temporarily shift the base to 2, 8, 10, and 16 respectively
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\ ** and consume the next number in the input stream, pushing/compiling
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\ ** as normal
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\ (jws) __tempbase is precompiled, as are 0x and 0d - see prefix.c
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\
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\ : __tempbase { newbase | oldbase -- }
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\ base @ to oldbase
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\ newbase base !
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\ 0 0 parse-word >number 2drop drop
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\ oldbase base !
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\ ;
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: 0b 2 __tempbase ; immediate
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: 0o 8 __tempbase ; immediate
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\ : 0d 10 __tempbase ; immediate
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\ "0d" add-prefix
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\ : 0x 16 __tempbase ; immediate
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\ "0x" add-prefix
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end-prefixes
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\ #endif
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