33 lines
817 B
Factor
33 lines
817 B
Factor
USING: io kernel math math.functions math.parser parser
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namespaces sequences splitting combinators continuations
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sequences.lib ;
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IN: money
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: dollars/cents ( dollars -- dollars cents )
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100 * 100 /mod round ;
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: money. ( object -- )
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dollars/cents
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[
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"$" %
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swap number>string
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<reversed> 3 group "," join <reversed> %
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"." % number>string 2 CHAR: 0 pad-left %
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] "" make print ;
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TUPLE: not-a-decimal ;
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: not-a-decimal ( -- * )
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T{ not-a-decimal } throw ;
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: parse-decimal ( str -- ratio )
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"." split1
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>r dup "-" head? [ drop t "0" ] [ f swap ] if r>
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[ dup empty? [ drop "0" ] when ] 2apply
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dup length
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>r [ string>number dup [ not-a-decimal ] unless ] 2apply r>
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10 swap ^ / + swap [ neg ] when ;
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: DECIMAL:
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scan parse-decimal parsed ; parsing
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