80 lines
2.6 KiB
Text
80 lines
2.6 KiB
Text
Forth systems often have a word that displays the names of all
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words in the dictionary. This can be helpful on occasion, but it
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doesn't provide very much information and can be quite daunting
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to newer users.
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In Retro, I want to do better. The first step towards this is to
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allow listing words in different ways. Retro includes two for
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doing this:
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word stack description
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================ ===== ===================================
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d:words - display all words in the dictionary
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d:words-with s- display words with the specified
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substring in their name
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In this, I propose two additional ones:
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word stack description
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================ ===== ===================================
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d:words-in-class a- display words with the specified
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class handler
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d:words-by-class - display all words, grouped by their
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class handler
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The first is pretty easy. Retro has a `d:for-each` combinator
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for iterating over the dictionary. With this I can pass a pointer
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to the class handler and compare this to each header, showing
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only the entries that match.
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I am using `reorder` to setup the stack. I could also have done
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this via `[ over ] dip swap` or `push over pop swap`. The use of
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`reorder` is simply done to make the stack alteration obvious.
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~~~
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:d:words-in-class (a-)
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[ dup d:class fetch
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'abc 'abca reorder
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eq? [ d:name s:put sp ] &drop choose ] d:for-each
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drop ;
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~~~
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The second one is a little more involved.
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First, all class handlers must be identified. I do this with the
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`d:for-each` combinator, looking for names that have a `class:`
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prefix. (This suffices as I keep all my class handlers in the
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`class:` namespace; it won't pick up ones with non-standard naming)
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I iterate over the dictionary and construct a set to hold a pointer
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to the header for each class I identify.
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The exposed word also uses `d:for-each`, iterating over the
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dictionary once for each class in the set. It displays the name of
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the class, and then uses `d:words-in-class` to display the words.
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Of note here, creating a set consumes space. I'm using the
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`v:preserve` combinator to preserve the location of `here` so that
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any used space is recovered.
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~~~
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{{
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:identify-classes (-a)
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here #0 ,
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[ dup d:name 'class: s:contains-string?
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&, &drop choose ] d:for-each
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here over - n:dec over store ;
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---reveal---
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:d:words-by-class
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&Heap [ identify-classes
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[ [ d:name s:put nl ]
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[ d:xt fetch d:words-in-class ] bi
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nl nl ] a:for-each ] v:preserve ;
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}}
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~~~
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```
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d:words-by-class
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```
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