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import java.nio.file._ | |
object mail_header { | |
def read_file(path: String): Option[String] = { | |
val p = Paths.get(path) | |
if (Files.exists(p)) Some(new String(Files.readAllBytes(p))) else None | |
} | |
def split_header_body(text: String): Option[(String, String)] = { | |
text.split("\r\n\r\n", 2) match { | |
case Array(header, body) => Some(header, body) | |
case _ => None | |
} | |
} | |
def unfold_header(header: String): String = | |
header.replaceAll("\r\n[ \t]+", " ") | |
def split_field(line: String): Option[(String, String)] = { | |
val pat = """(\S+): *(.+)?""".r | |
pat.findFirstMatchIn(line) match { | |
case Some(m) => Some(m.group(1), Option(m.group(2)).getOrElse("")) | |
case None => None | |
} | |
} | |
def parse_header(header: String): List[(String, String)] = | |
header.lines.flatMap(split_field).toList | |
def tuple_to_hash(header: List[(String, String)]): Map[String, List[String]] = | |
header.groupBy(_._1).map { case (k, v) => (k.toLowerCase(), v.map(_._2)) } | |
def main(args: Array[String]): Unit = { | |
val text = read_file("data.txt").getOrElse(sys.error("File not found")) | |
val (header, _) = split_header_body(text).getOrElse(sys.error("Invalid mail-header")) | |
val unfolded_header = unfold_header(header) | |
val tupled_header = parse_header(unfolded_header) | |
val mail_header = tuple_to_hash(tupled_header) | |
println(mail_header) | |
} | |
} |
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