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/*
* sbt-boilerplate is distributed under the 2-Clause BSD license. See the LICENSE file in the root
* of the repository.
*
* Copyright (c) 2012 Johannes Rudolph
*/
package 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] = "##" ~> """\d+""".r ^^ (new String(_)) ^^ FixedString
def outsideTemplate: Parser[FixedString]= """(?s).*?(?=(\[#)|(\z))""".r ^^ (FixedString(_))
def expand: Parser[Expand] = "[#" ~> elements ~ "#" ~ separatorChars <~ "]" ^^ {
case els ~ x ~ sep => Expand(els, sep.getOrElse(", "))
}
def embeddedTemplate:Parser[TemplateElement] = opt(outsideTemplate)~expand~opt(outsideTemplate) ^^ {
case before~ex~after => Sequence(Seq(before,Some(ex),after).flatten)
}
def separatorChars: Parser[Option[String]] = rep("""[^\]]""".r) ^^ (_.reduceLeftOption(_ + _))
def parse(input:String): TemplateElement =
phrase(embeddedTemplate)(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))
println("Template:\n"+format+"\n")
println("Generated Code:\n"+Generator.generateFromTemplate(format,5))
println("-----End-----\n")
}
check("""This text
|should not be parsed
|Tuple1
|
[#Tuple1#]
|
|Product 1""".stripMargin)
check("[#abc ##1 # ++ ]")
check("[#abc Tuple##22 #]")
check("[#abc Tuple1 #]")
}
|
