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Scala のパーサコンビネータ (RegexParsers) を使った郵便番号のパーサ
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name := "PostalCodeParser" | |
version := "1.0" | |
scalaVersion := "2.12.2" | |
// Parser Combinator は外部ライブラリになりました | |
libraryDependencies += "org.scala-lang.modules" %% "scala-parser-combinators" % "1.0.6" |
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import scala.util.parsing.combinator._ | |
// パーサ | |
class PostalCodeParser extends RegexParsers { | |
// 地域番号 ( "-" より前の 3 桁) | |
def regionCode: Parser[Int] = """[0-9]{3}""".r ^^ { _.toInt } | |
// "-" よりあとの 4 けた | |
def detailCode: Parser[Int] = """[0-9]{4}""".r ^^ { _.toInt } | |
// 区切り ("-") | |
def separator: Parser[String] = """-""".r ^^ { _.toString } | |
// 郵便番号 | |
def postalCode: Parser[PostalCode] = regionCode ~ separator ~ detailCode ^^ { case r ~ s ~ d => PostalCode(r, d) } | |
} | |
// 郵便番号をあらわす case class | |
case class PostalCode(region: Int, detail: Int) { | |
override def toString = s"${"%03d".format(region)}-${"%04d".format(detail)}" | |
} | |
// テスト用に 123-4567 をパースします | |
object TestPostalCodeParser extends PostalCodeParser { | |
def main(args: Array[String]) = { | |
parse(postalCode, "123-4567") match { | |
case Success(matched, _) => println(matched.toString) | |
case Failure(msg, _) => println("FAILURE: " + msg) | |
case Error(msg, _) => println("ERROR: " + msg) | |
} | |
} | |
} |
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