28 lines
595 B
Forth
28 lines
595 B
Forth
# s:dedup
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String deduplication for RetroForth.
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(c) Arland Childers
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~~~
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'init s:keep fll:create 's:dedup.data var-n
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{{
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't1 var
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't2 var
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---reveal---
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:s:dedup.register (s-)
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s:keep @s:dedup.data swap &fll:append/value sip ;
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:s:dedup.defined? (s-f)
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!t1 #0 !t2
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@s:dedup.data [ @t1 s:eq? @t2 or !t2 ] fll:for-each @t2 ;
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:s:dedup.find (s-s)
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!t1 #0 !t2
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@s:dedup.data [ dup @t1 s:eq? [ !t2 ] [ drop ] choose ]
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fll:for-each @t2 ;
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:s:dedup (s-s)
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dup s:dedup.defined? [ s:dedup.find ] [ s:dedup.register ]
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choose ;
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:s:unique? (s-f) s:dedup.defined? ;
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}}
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~~~
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