68 lines
1.7 KiB
Forth
68 lines
1.7 KiB
Forth
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# Forget
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This is an alternative to `mark`.
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As a byproduct you get `hide` which hides a word from later
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dictionary search.
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~~~
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:d:exists? d:lookup n:zero? ;
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'abort d:exists? [ 'example/Abort.forth include ] if
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's:(evaluate) d:exists? [ 'example/EvaluateString.forth include ] if
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~~~
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## EOC (end-of-code)
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~~~
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:d:size (-) #0 [ d:name drop #1 + ] d:for-each ;
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:d:words.last (n-)
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&Dictionary swap [ fetch dup d:name s:put sp d:link ] times drop ;
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:EOC (-) 'EOC_(end-of-code) s:shout
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d:size '%n_words_defined s:format s:put nl
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#4 [ '%n_last_defined_words: s:format s:put sp ] sip d:words.last listen ;
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~~~
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## d:hide
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~~~
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{{
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'This 'Newer [ var ] bi@
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:names-match? (a-f) d:name here s:eq? ;
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:word-exists?continue (s-s) [ dup d:lookup ] assert ;
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:d:newer-older (s-aa)_newer_older word-exists?continue
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here s:copy d:last #0 !Newer [ dup names-match?
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[ @Newer TRUE ] [ dup !Newer d:link fetch FALSE ] choose
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] until (this_newer) swap d:link fetch (older) ;
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:exist?continue (aa-aa) [ dup-pair [ n:-zero? ] bi@ and ] assert ;
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---reveal---
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:d:newer (s-a) d:newer-older drop ;
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:d:hide (s-) d:newer-older exist?continue swap d:link store ;
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}}
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~~~
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```
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:a ; :b ; :c ;
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'b d:hide
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'#5_d:words.last s:(evaluate)
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```
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# Forget
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~~~
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:d:forget.a (a-) dup n:-zero? [ dup !Heap d:link fetch !Dictionary ]
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[ drop 'tried_to_d:forget_a_word_that_doesn't_exist. s:shout ] choose ;
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:d:forget (s-) d:lookup d:forget.a ;
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:f:reset (-|float:?-) f:depth [ f:drop ] times ;
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:reset.nf (?-|float:?-) reset f:reset ;
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:d:wipe (-) reset.nf '---wipe--- d:newer d:forget.a ;
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~~~
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```
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:---wipe--- ;
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:a ; :b ; :c ; nl
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'#5_d:words.last s:(evaluate)
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d:wipe nl
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'#5_d:words.last s:(evaluate) nl
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```
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