parser combinator: how to terminate repetition on keyword

北城余情 提交于 2019-11-30 23:33:51

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import scala.util.parsing.combinator.syntactical._

object CAQuery extends StandardTokenParsers {
    lexical.reserved += ("START", "END")
    lexical.delimiters += (" ")

    def query:Parser[Any]= "START" ~> rep1(ident) <~ "END"

    def parse(s:String) = {
       val tokens = new lexical.Scanner(s)
       phrase(query)(tokens)
   }   
}

println(CAQuery.parse("""START a END"""))       //List(a)
println(CAQuery.parse("""START a b c END"""))   //List(a, b, c)

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