gistfile1.txt

import scala.util.parsing.combinator._

class HeaderPsvRegexParser extends HeaderCharacterRegexParser("|") {}
class HeaderCsvRegexParser extends HeaderCharacterRegexParser(",") {}

class HeaderCharacterRegexParser(delimiterCharacter:String) extends RegexParsers
{
	// 2012-Jul-20 - The parser was removing splaces.
	// 2015-Jul-07 - This override is required so that internal spaces remain.
  override protected val whiteSpace = """[\t]""".r

//	def COMMA   = ","
  def COMMA = delimiterCharacter
	def DQUOTE  = "\""
	def DQUOTE2 = "\"\"" ^^ { case _ => "\"" }
	def CR      = "\r"
	def LF      = "\n"
	def CRLF    = "\r\n"
	def TXT     = ("[^\""+COMMA+"\r\n]").r
  def TXT_NON_GREEDY = ("[^\""+COMMA+"\r\n]+").r

  // 2015-Jun-09 Brockman - Attentiveness to whitespace in file
  def WS_OPTION = "\\s*".r

	def file: Parser[List[List[String]]] = repsep(record, CRLF) <~ opt(CRLF)
	def record: Parser[List[String]] = rep1sep(field, COMMA)
	def field: Parser[String] = (escaped|nonescaped)
	def escaped: Parser[String] = WS_OPTION~>(DQUOTE~>((TXT|COMMA|CR|LF|DQUOTE2)*)<~DQUOTE)<~WS_OPTION ^^ { case ls => ls.mkString("")}
	def nonescaped: Parser[String] = WS_OPTION~>(TXT*)<~WS_OPTION ^^ {
      case ls => ls.mkString("").trim  // 2015- Only trim space content around non escaped terms. Example:  Spacey , -> "Spacey"
  }

	def parse(s: String) = parseAll(file, s) match {
		case Success(res, _) => res
		case _ => List[List[String]]()
	}
}