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package cc.spray.boilerplate
import util.parsing.combinator.RegexParsers
import java.lang.RuntimeException
sealed trait TemplateElement
case class Sequence(elements: Seq[TemplateElement]) extends TemplateElement
case class LiteralString(literal: String) extends TemplateElement
case class FixedString(literal: String) extends TemplateElement
case class Expand(inner: TemplateElement, separator: String) extends TemplateElement
object TemplateParser extends RegexParsers {
override type Elem = Char
type Tokens = TemplateElement
override val skipWhitespace = false
def elements: Parser[TemplateElement] = rep1(element) ^^ {
case one :: Nil => one
case several => Sequence(several)
}
def element: Parser[TemplateElement] = literal | fixed | expand
def literalChar: Parser[String] = """(?s:(?!\[#)(?!#[^\]]*\]).)""".r
def literalChars: Parser[String] = rep1(literalChar) ^^ { _.reduceLeft(_ + _) }
def literal: Parser[LiteralString] = literalChars ^^ LiteralString
def fixed: Parser[FixedString] = "##" ~> ".".r ^^ (new String(_)) ^^ FixedString
def expand: Parser[Expand] = "[#" ~> elements ~ "#" ~ separatorChars <~ "]" ^^ {
case els ~ x ~ sep => Expand(els, sep.getOrElse(", "))
}
def separatorChars: Parser[Option[String]] = rep("""[^\]]""".r) ^^ (_.reduceLeftOption(_ + _))
def parse(input:String): TemplateElement =
phrase(elements)(new scala.util.parsing.input.CharArrayReader(input.toCharArray)) match {
case Success(res,_) => res
case x:NoSuccess => throw new RuntimeException(x.msg)
}
}
object TestParser extends App {
def check(format: String) {
println(TemplateParser.parse(format))
}
check("[#abc ##1 # ++ ]")
}
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