45 lines
1.2 KiB
Forth
45 lines
1.2 KiB
Forth
# 99 Bottles
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Display the text for the *99 Bottles of Beer* song.
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For this, I'm using `s:evaluate` to construct words which
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display a string when called. This lets the majority of the
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code read nicely.
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~~~
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{ 'bottle 'bottles 'of 'beer 'on 'the 'wall 'no 'more
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'Take 'one 'down, 'pass 'it 'around }
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[ dup ':%s_'%s_s:put_sp_; s:format s:evaluate ] a:for-each
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~~~
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Handling of the exact text related to the number of bottles
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is done with a simple array of functions that get selected
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based on the number of bottles left. This is done with a
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very simple filter, where the number of bottles for the
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purpose of the text is in a set of 2 or more, 1, or none.
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~~~
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{ [ no more bottles ]
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[ #1 n:put sp bottle ]
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[ dup n:put sp bottles ]
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} 'BOTTLES const
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:number-bottles
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dup #2 n:min BOTTLES swap a:fetch call ;
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~~~
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Thanks to the programatically generated words for the
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verse text, the main code is nicely readable.
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~~~
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:display-verse
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number-bottles of beer on the wall nl
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number-bottles of beer nl
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n:dec Take one down, pass it around nl
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number-bottles of beer on the wall nl ;
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:verses (n-)
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repeat 0; nl display-verse again ;
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#99 verses
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~~~
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