gistfile1.scala

def parseQuote = "%{" ~> Parser { input_ =>
    var (input, brackets, text) = (input_, 1, "")
    while (brackets > 0) {
        val char = input.first
        input = input.rest
        if (char == '{') {
            brackets += 1
        } else if (char == '}') {
            brackets -= 1
        }
        if (brackets > 0) {
            text += char
        }
    }
    Success(text, input)
}