22 lines
626 B
Factor
22 lines
626 B
Factor
! Copyright (C) 2010 John Benediktsson
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! See http://factorcode.org/license.txt for BSD license
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USING: fry kernel lexer macros math math.parser peg.ebnf random
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sequences ;
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IN: dice
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EBNF: parse-roll
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number = ([0-9])+ => [[ string>number ]]
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dice = "d" number => [[ second '[ _ random ] ]]
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roll = number dice => [[ first2 '[ 0 _ [ @ + 1 + ] times ] ]]
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added = "+" number => [[ second '[ _ + ] ]]
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total = roll added? => [[ first2 [ append ] when* ]]
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error = .* => [[ "unknown dice" throw ]]
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rolls = total | error
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;EBNF
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MACRO: roll ( string -- ) parse-roll ;
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SYNTAX: ROLL: scan-token parse-roll append! ;
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