Created
December 18, 2011 05:50
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漢数字パーサだよ
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| import scalaz._ | |
| import Scalaz._ | |
| import scala.util.parsing.combinator._ | |
| object KanjiNumberParser extends RegexParsers { | |
| def one = "一" ^^ { _ => 1L } | |
| def two = "二" ^^ { _ => 2L } | |
| def three = "三" ^^ { _ => 3L } | |
| def four = "四" ^^ { _ => 4L } | |
| def five = "五" ^^ { _ => 5L } | |
| def six = "六" ^^ { _ => 6L } | |
| def seven = "七" ^^ { _ => 7L } | |
| def eight = "八" ^^ { _ => 8L } | |
| def nine = "九" ^^ { _ => 9L } | |
| def oneDigit = | |
| one | two | three | four | five | six | seven | eight | nine | |
| def ju = opt(oneDigit) <~ "十" ^^ { n => (n | 1L) * 10L } | |
| def hyaku = opt(oneDigit) <~ "百" ^^ { n => (n | 1L) * 100L } | |
| def sen = opt(oneDigit) <~ "千" ^^ { n => (n | 1L) * 1000L } | |
| def threeDigits = opt(sen) ~ opt(hyaku) ~ opt(ju) ~ opt(oneDigit) ^^ { | |
| case a ~ b ~ c ~ d => ~ (a |+| b |+| c |+| d) | |
| } | |
| def man = opt(threeDigits) <~ "万" ^^ { n => (n | 1L) * 10000L } | |
| def oku = opt(threeDigits) <~ "億" ^^ { n => (n | 1L) * 10000L * 10000L } | |
| def cho = opt(threeDigits) <~ "兆" ^^ { n => (n | 1L) * 10000L * 10000L * 10000L } | |
| def kanjiNumber = opt(cho) ~ opt(oku) ~ opt(man) ~ opt(threeDigits) ^^ { | |
| case a ~ b ~ c ~ d => ~ (a |+| b |+| c |+| d) | |
| } | |
| def parse(in: String) = parseAll(kanjiNumber, in) | |
| } | |
| object Main extends App { | |
| println(KanjiNumberParser.parse("千五百兆二千二億三千五百十九万百一")) | |
| } | |
| /* | |
| [info] Running Main | |
| [1.18] parsed: 1500200235190101 | |
| */ | |
あと
case a ~ b ~ c ~ d => (a |+| b |+| c |+| d) | 0Lは
case a ~ b ~ c ~ d => ~ (a |+| b |+| c |+| d)って書けば、零元を明示的に書かなくて、短く書けて素敵！ってなるんじゃなイカ！？
https://github.com/scalaz/scalaz/blob/6.0.3/core/src/main/scala/scalaz/OptionW.scala#L80
短く書けて素敵！
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な、なんだってー！