nom 2.2.1

//#![feature(trace_macros)]
#[macro_use]
extern crate nom;

use nom::{IResult,Needed,HexDisplay,space,digit,be_u16};
use std::str;

#[allow(dead_code)]
struct Range {
  start: char,
  end:   char
}

pub fn take_char(input: &[u8]) -> IResult<&[u8], char> {
  if input.len() > 0 {
    IResult::Done(&input[1..], input[0] as char)
  } else {
    IResult::Incomplete(Needed::Size(1))
  }
}

//trace_macros!(true);

#[allow(dead_code)]
named!(range<&[u8], Range>,
    alt!(
        do_parse!(
            start: take_char >>
            tag!("-")        >>
            end: take_char   >>
            (Range {
                start: start,
                end:   end,
            })
        ) |
        map!(
            take_char,
            |c| {
                Range {
                    start: c,
                    end:   c,
                }
            }
        )
    )
);


#[allow(dead_code)]
named!(literal<&[u8], Vec<char> >,
    map!(
        many1!(take_char),
        |cs| {
          cs
        }
    )
);

#[test]
fn issue_58() {
  range(&b"abcd"[..]);
  literal(&b"abcd"[..]);
}

//trace_macros!(false);

named!(parse_ints< Vec<i32> >, many0!(spaces_or_int));

fn spaces_or_int(input: &[u8]) -> IResult<&[u8], i32>{
  println!("{}", input.to_hex(8));
  do_parse!(input,
    opt!(complete!(space)) >>
    res: map!(complete!(digit),
    |x| {
      println!("x: {:?}", x);
      let result = str::from_utf8(x).unwrap();
      println!("Result: {}", result);
      println!("int is empty?: {}", x.is_empty());
      match result.parse(){
        Ok(i) => i,
        Err(_) =>  panic!("UH OH! NOT A DIGIT!")
      }
    }) >>
    (res)
  )
}

#[test]
fn issue_142(){
   let subject = parse_ints(&b"12 34 5689"[..]);
   let expected = IResult::Done(&b""[..], vec![12, 34, 5689]);
   assert_eq!(subject, expected);

   let subject = parse_ints(&b"12 34 5689 "[..]);
   let expected = IResult::Done(&b" "[..], vec![12, 34, 5689]);
   assert_eq!(subject, expected)
}

#[test]
fn usize_length_bytes_issue(){
  length_bytes!(b"012346", be_u16);
}

/*
 DOES NOT COMPILE
#[test]
fn issue_152() {
  named!(take4, take!(4));
  named!(xyz, tag!("XYZ"));
  named!(abc, tag!("abc"));


  named!(sw,
    switch!(take4,
      b"abcd" => xyz |
      b"efgh" => abc
    )
  );
}
*/

#[test]
fn take_till_issue() {
    named!(nothing,
        take_till!(call!(|_| true))
    );

    assert_eq!(nothing(b""), IResult::Done(&b""[..], &b""[..]));
    assert_eq!(nothing(b"abc"), IResult::Done(&b"abc"[..], &b""[..]));
}