third_party_rust_nom/tests/issues.rs

//#![feature(trace_macros)]
#![allow(dead_code)]
#![cfg_attr(feature = "cargo-clippy", allow(redundant_closure))]

use nom::{error::ErrorKind, Err, IResult, Needed};

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

pub fn take_char(input: &[u8]) -> IResult<&[u8], char> {
  if !input.is_empty() {
    Ok((&input[1..], input[0] as char))
  } else {
    Err(Err::Incomplete(Needed::new(1)))
  }
}

#[cfg(feature = "std")]
mod parse_int {
  use nom::HexDisplay;
  use nom::{
    character::streaming::{digit1 as digit, space1 as space},
    IResult,
  };
  use std::str;

  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(e) => panic!("UH OH! NOT A DIGIT! {:?}", e),
          }
        })
        >> (res)
    )
  }

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

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

#[test]
fn usize_length_bytes_issue() {
  use nom::number::streaming::be_u16;
  let _: IResult<&[u8], &[u8], (&[u8], ErrorKind)> = length_data!(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""), Err(Err::Incomplete(Needed::new(1))));
  assert_eq!(nothing(b"abc"), Ok((&b"abc"[..], &b""[..])));
}

#[test]
fn issue_655() {
  use nom::character::streaming::{line_ending, not_line_ending};
  named!(twolines(&str) -> (&str, &str),
    do_parse!(
      l1 : not_line_ending >>
           line_ending >>
      l2 : not_line_ending >>
           line_ending >>
      ((l1, l2))
    )
  );

  assert_eq!(twolines("foo\nbar\n"), Ok(("", ("foo", "bar"))));
  assert_eq!(twolines("féo\nbar\n"), Ok(("", ("féo", "bar"))));
  assert_eq!(twolines("foé\nbar\n"), Ok(("", ("foé", "bar"))));
  assert_eq!(twolines("foé\r\nbar\n"), Ok(("", ("foé", "bar"))));
}

#[cfg(feature = "alloc")]
named!(issue_717<&[u8], Vec<&[u8]> >,
  separated_list0!(tag!([0x0]), is_not!([0x0u8]))
);

mod issue_647 {
  use nom::{error::Error, number::streaming::be_f64, Err};
  pub type Input<'a> = &'a [u8];

  #[derive(PartialEq, Debug, Clone)]
  struct Data {
    c: f64,
    v: Vec<f64>,
  }

  fn list<'a, 'b>(
    input: Input<'a>,
    _cs: &'b f64,
  ) -> Result<(Input<'a>, Vec<f64>), Err<Error<&'a [u8]>>> {
    separated_list0!(input, complete!(tag!(",")), complete!(be_f64))
  }

  named!(data<Input,Data>, map!(
      do_parse!(
          c: be_f64 >>
          tag!("\n") >>
          v: call!(list,&c) >>
          (c,v)
      ), |(c,v)| {
          Data {
              c: c,
              v: v
          }
      }
  ));
}

#[test]
fn issue_848_overflow_incomplete_bits_to_bytes() {
  named!(take, take!(0x2000000000000000));
  named!(parser<&[u8], &[u8]>, bits!(bytes!(take)));
  assert_eq!(
    parser(&b""[..]),
    Err(Err::Failure(error_position!(&b""[..], ErrorKind::TooLarge)))
  );
}

#[test]
fn issue_942() {
  use nom::error::{ContextError, ParseError};
  pub fn parser<'a, E: ParseError<&'a str> + ContextError<&'a str>>(
    i: &'a str,
  ) -> IResult<&'a str, usize, E> {
    use nom::{character::complete::char, error::context, multi::many0_count};
    many0_count(context("char_a", char('a')))(i)
  }
  assert_eq!(parser::<()>("aaa"), Ok(("", 3)));
}

#[test]
fn issue_many_m_n_with_zeros() {
  use nom::character::complete::char;
  use nom::multi::many_m_n;
  let mut parser = many_m_n::<_, _, (), _>(0, 0, char('a'));
  assert_eq!(parser("aaa"), Ok(("aaa", vec!())));
}

#[test]
fn issue_1027_convert_error_panic_nonempty() {
  use nom::character::complete::char;
  use nom::error::{convert_error, VerboseError};
  use nom::sequence::pair;

  let input = "a";

  let result: IResult<_, _, VerboseError<&str>> = pair(char('a'), char('b'))(input);
  let err = match result.unwrap_err() {
    Err::Error(e) => e,
    _ => unreachable!(),
  };

  let msg = convert_error(input, err);
  assert_eq!(
    msg,
    "0: at line 1:\na\n ^\nexpected \'b\', got end of input\n\n"
  );
}

#[test]
fn issue_1231_bits_expect_fn_closure() {
  use nom::bits::{bits, complete::take};
  use nom::error::Error;
  use nom::sequence::tuple;
  pub fn example(input: &[u8]) -> IResult<&[u8], (u8, u8)> {
    bits::<_, _, Error<_>, _, _>(tuple((take(1usize), take(1usize))))(input)
  }
  assert_eq!(example(&[0xff]), Ok((&b""[..], (1, 1))));
}