Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1227 insertions, 0 deletions

diff --git a/third_party/rust/nom/src/character/complete.rs b/third_party/rust/nom/src/character/complete.rs
new file mode 100644
index 0000000000..7cb760a683
--- /dev/null
+++ b/third_party/rust/nom/src/character/complete.rs
@@ -0,0 +1,1227 @@
+//! Character specific parsers and combinators, complete input version.
+//!
+//! Functions recognizing specific characters.
+
+use crate::branch::alt;
+use crate::combinator::opt;
+use crate::error::ErrorKind;
+use crate::error::ParseError;
+use crate::internal::{Err, IResult};
+use crate::lib::std::ops::{Range, RangeFrom, RangeTo};
+use crate::traits::{
+  AsChar, FindToken, InputIter, InputLength, InputTake, InputTakeAtPosition, Slice,
+};
+use crate::traits::{Compare, CompareResult};
+
+/// Recognizes one character.
+///
+/// *Complete version*: Will return an error if there's not enough input data.
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{ErrorKind, Error}, IResult};
+/// # use nom::character::complete::char;
+/// fn parser(i: &str) -> IResult<&str, char> {
+///     char('a')(i)
+/// }
+/// assert_eq!(parser("abc"), Ok(("bc", 'a')));
+/// assert_eq!(parser(" abc"), Err(Err::Error(Error::new(" abc", ErrorKind::Char))));
+/// assert_eq!(parser("bc"), Err(Err::Error(Error::new("bc", ErrorKind::Char))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Char))));
+/// ```
+pub fn char<I, Error: ParseError<I>>(c: char) -> impl Fn(I) -> IResult<I, char, Error>
+where
+  I: Slice<RangeFrom<usize>> + InputIter,
+  <I as InputIter>::Item: AsChar,
+{
+  move |i: I| match (i).iter_elements().next().map(|t| {
+    let b = t.as_char() == c;
+    (&c, b)
+  }) {
+    Some((c, true)) => Ok((i.slice(c.len()..), c.as_char())),
+    _ => Err(Err::Error(Error::from_char(i, c))),
+  }
+}
+
+/// Recognizes one character and checks that it satisfies a predicate
+///
+/// *Complete version*: Will return an error if there's not enough input data.
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{ErrorKind, Error}, Needed, IResult};
+/// # use nom::character::complete::satisfy;
+/// fn parser(i: &str) -> IResult<&str, char> {
+///     satisfy(|c| c == 'a' || c == 'b')(i)
+/// }
+/// assert_eq!(parser("abc"), Ok(("bc", 'a')));
+/// assert_eq!(parser("cd"), Err(Err::Error(Error::new("cd", ErrorKind::Satisfy))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Satisfy))));
+/// ```
+pub fn satisfy<F, I, Error: ParseError<I>>(cond: F) -> impl Fn(I) -> IResult<I, char, Error>
+where
+  I: Slice<RangeFrom<usize>> + InputIter,
+  <I as InputIter>::Item: AsChar,
+  F: Fn(char) -> bool,
+{
+  move |i: I| match (i).iter_elements().next().map(|t| {
+    let c = t.as_char();
+    let b = cond(c);
+    (c, b)
+  }) {
+    Some((c, true)) => Ok((i.slice(c.len()..), c)),
+    _ => Err(Err::Error(Error::from_error_kind(i, ErrorKind::Satisfy))),
+  }
+}
+
+/// Recognizes one of the provided characters.
+///
+/// *Complete version*: Will return an error if there's not enough input data.
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::ErrorKind};
+/// # use nom::character::complete::one_of;
+/// assert_eq!(one_of::<_, _, (&str, ErrorKind)>("abc")("b"), Ok(("", 'b')));
+/// assert_eq!(one_of::<_, _, (&str, ErrorKind)>("a")("bc"), Err(Err::Error(("bc", ErrorKind::OneOf))));
+/// assert_eq!(one_of::<_, _, (&str, ErrorKind)>("a")(""), Err(Err::Error(("", ErrorKind::OneOf))));
+/// ```
+pub fn one_of<I, T, Error: ParseError<I>>(list: T) -> impl Fn(I) -> IResult<I, char, Error>
+where
+  I: Slice<RangeFrom<usize>> + InputIter,
+  <I as InputIter>::Item: AsChar + Copy,
+  T: FindToken<<I as InputIter>::Item>,
+{
+  move |i: I| match (i).iter_elements().next().map(|c| (c, list.find_token(c))) {
+    Some((c, true)) => Ok((i.slice(c.len()..), c.as_char())),
+    _ => Err(Err::Error(Error::from_error_kind(i, ErrorKind::OneOf))),
+  }
+}
+
+/// Recognizes a character that is not in the provided characters.
+///
+/// *Complete version*: Will return an error if there's not enough input data.
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::ErrorKind};
+/// # use nom::character::complete::none_of;
+/// assert_eq!(none_of::<_, _, (&str, ErrorKind)>("abc")("z"), Ok(("", 'z')));
+/// assert_eq!(none_of::<_, _, (&str, ErrorKind)>("ab")("a"), Err(Err::Error(("a", ErrorKind::NoneOf))));
+/// assert_eq!(none_of::<_, _, (&str, ErrorKind)>("a")(""), Err(Err::Error(("", ErrorKind::NoneOf))));
+/// ```
+pub fn none_of<I, T, Error: ParseError<I>>(list: T) -> impl Fn(I) -> IResult<I, char, Error>
+where
+  I: Slice<RangeFrom<usize>> + InputIter,
+  <I as InputIter>::Item: AsChar + Copy,
+  T: FindToken<<I as InputIter>::Item>,
+{
+  move |i: I| match (i).iter_elements().next().map(|c| (c, !list.find_token(c))) {
+    Some((c, true)) => Ok((i.slice(c.len()..), c.as_char())),
+    _ => Err(Err::Error(Error::from_error_kind(i, ErrorKind::NoneOf))),
+  }
+}
+
+/// Recognizes the string "\r\n".
+///
+/// *Complete version*: Will return an error if there's not enough input data.
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult};
+/// # use nom::character::complete::crlf;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     crlf(input)
+/// }
+///
+/// assert_eq!(parser("\r\nc"), Ok(("c", "\r\n")));
+/// assert_eq!(parser("ab\r\nc"), Err(Err::Error(Error::new("ab\r\nc", ErrorKind::CrLf))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::CrLf))));
+/// ```
+pub fn crlf<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: Slice<Range<usize>> + Slice<RangeFrom<usize>>,
+  T: InputIter,
+  T: Compare<&'static str>,
+{
+  match input.compare("\r\n") {
+    //FIXME: is this the right index?
+    CompareResult::Ok => Ok((input.slice(2..), input.slice(0..2))),
+    _ => {
+      let e: ErrorKind = ErrorKind::CrLf;
+      Err(Err::Error(E::from_error_kind(input, e)))
+    }
+  }
+}
+
+//FIXME: there's still an incomplete
+/// Recognizes a string of any char except '\r\n' or '\n'.
+///
+/// *Complete version*: Will return an error if there's not enough input data.
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::character::complete::not_line_ending;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     not_line_ending(input)
+/// }
+///
+/// assert_eq!(parser("ab\r\nc"), Ok(("\r\nc", "ab")));
+/// assert_eq!(parser("ab\nc"), Ok(("\nc", "ab")));
+/// assert_eq!(parser("abc"), Ok(("", "abc")));
+/// assert_eq!(parser(""), Ok(("", "")));
+/// assert_eq!(parser("a\rb\nc"), Err(Err::Error(Error { input: "a\rb\nc", code: ErrorKind::Tag })));
+/// assert_eq!(parser("a\rbc"), Err(Err::Error(Error { input: "a\rbc", code: ErrorKind::Tag })));
+/// ```
+pub fn not_line_ending<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: Slice<Range<usize>> + Slice<RangeFrom<usize>> + Slice<RangeTo<usize>>,
+  T: InputIter + InputLength,
+  T: Compare<&'static str>,
+  <T as InputIter>::Item: AsChar,
+  <T as InputIter>::Item: AsChar,
+{
+  match input.position(|item| {
+    let c = item.as_char();
+    c == '\r' || c == '\n'
+  }) {
+    None => Ok((input.slice(input.input_len()..), input)),
+    Some(index) => {
+      let mut it = input.slice(index..).iter_elements();
+      let nth = it.next().unwrap().as_char();
+      if nth == '\r' {
+        let sliced = input.slice(index..);
+        let comp = sliced.compare("\r\n");
+        match comp {
+          //FIXME: calculate the right index
+          CompareResult::Ok => Ok((input.slice(index..), input.slice(..index))),
+          _ => {
+            let e: ErrorKind = ErrorKind::Tag;
+            Err(Err::Error(E::from_error_kind(input, e)))
+          }
+        }
+      } else {
+        Ok((input.slice(index..), input.slice(..index)))
+      }
+    }
+  }
+}
+
+/// Recognizes an end of line (both '\n' and '\r\n').
+///
+/// *Complete version*: Will return an error if there's not enough input data.
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::character::complete::line_ending;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     line_ending(input)
+/// }
+///
+/// assert_eq!(parser("\r\nc"), Ok(("c", "\r\n")));
+/// assert_eq!(parser("ab\r\nc"), Err(Err::Error(Error::new("ab\r\nc", ErrorKind::CrLf))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::CrLf))));
+/// ```
+pub fn line_ending<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: Slice<Range<usize>> + Slice<RangeFrom<usize>> + Slice<RangeTo<usize>>,
+  T: InputIter + InputLength,
+  T: Compare<&'static str>,
+{
+  match input.compare("\n") {
+    CompareResult::Ok => Ok((input.slice(1..), input.slice(0..1))),
+    CompareResult::Incomplete => Err(Err::Error(E::from_error_kind(input, ErrorKind::CrLf))),
+    CompareResult::Error => {
+      match input.compare("\r\n") {
+        //FIXME: is this the right index?
+        CompareResult::Ok => Ok((input.slice(2..), input.slice(0..2))),
+        _ => Err(Err::Error(E::from_error_kind(input, ErrorKind::CrLf))),
+      }
+    }
+  }
+}
+
+/// Matches a newline character '\n'.
+///
+/// *Complete version*: Will return an error if there's not enough input data.
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::character::complete::newline;
+/// fn parser(input: &str) -> IResult<&str, char> {
+///     newline(input)
+/// }
+///
+/// assert_eq!(parser("\nc"), Ok(("c", '\n')));
+/// assert_eq!(parser("\r\nc"), Err(Err::Error(Error::new("\r\nc", ErrorKind::Char))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Char))));
+/// ```
+pub fn newline<I, Error: ParseError<I>>(input: I) -> IResult<I, char, Error>
+where
+  I: Slice<RangeFrom<usize>> + InputIter,
+  <I as InputIter>::Item: AsChar,
+{
+  char('\n')(input)
+}
+
+/// Matches a tab character '\t'.
+///
+/// *Complete version*: Will return an error if there's not enough input data.
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::character::complete::tab;
+/// fn parser(input: &str) -> IResult<&str, char> {
+///     tab(input)
+/// }
+///
+/// assert_eq!(parser("\tc"), Ok(("c", '\t')));
+/// assert_eq!(parser("\r\nc"), Err(Err::Error(Error::new("\r\nc", ErrorKind::Char))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Char))));
+/// ```
+pub fn tab<I, Error: ParseError<I>>(input: I) -> IResult<I, char, Error>
+where
+  I: Slice<RangeFrom<usize>> + InputIter,
+  <I as InputIter>::Item: AsChar,
+{
+  char('\t')(input)
+}
+
+/// Matches one byte as a character. Note that the input type will
+/// accept a `str`, but not a `&[u8]`, unlike many other nom parsers.
+///
+/// *Complete version*: Will return an error if there's not enough input data.
+/// # Example
+///
+/// ```
+/// # use nom::{character::complete::anychar, Err, error::{Error, ErrorKind}, IResult};
+/// fn parser(input: &str) -> IResult<&str, char> {
+///     anychar(input)
+/// }
+///
+/// assert_eq!(parser("abc"), Ok(("bc",'a')));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Eof))));
+/// ```
+pub fn anychar<T, E: ParseError<T>>(input: T) -> IResult<T, char, E>
+where
+  T: InputIter + InputLength + Slice<RangeFrom<usize>>,
+  <T as InputIter>::Item: AsChar,
+{
+  let mut it = input.iter_indices();
+  match it.next() {
+    None => Err(Err::Error(E::from_error_kind(input, ErrorKind::Eof))),
+    Some((_, c)) => match it.next() {
+      None => Ok((input.slice(input.input_len()..), c.as_char())),
+      Some((idx, _)) => Ok((input.slice(idx..), c.as_char())),
+    },
+  }
+}
+
+/// Recognizes zero or more lowercase and uppercase ASCII alphabetic characters: a-z, A-Z
+///
+/// *Complete version*: Will return the whole input if no terminating token is found (a non
+/// alphabetic character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::ErrorKind, IResult, Needed};
+/// # use nom::character::complete::alpha0;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     alpha0(input)
+/// }
+///
+/// assert_eq!(parser("ab1c"), Ok(("1c", "ab")));
+/// assert_eq!(parser("1c"), Ok(("1c", "")));
+/// assert_eq!(parser(""), Ok(("", "")));
+/// ```
+pub fn alpha0<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar,
+{
+  input.split_at_position_complete(|item| !item.is_alpha())
+}
+
+/// Recognizes one or more lowercase and uppercase ASCII alphabetic characters: a-z, A-Z
+///
+/// *Complete version*: Will return an error if there's not enough input data,
+/// or the whole input if no terminating token is found  (a non alphabetic character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::character::complete::alpha1;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     alpha1(input)
+/// }
+///
+/// assert_eq!(parser("aB1c"), Ok(("1c", "aB")));
+/// assert_eq!(parser("1c"), Err(Err::Error(Error::new("1c", ErrorKind::Alpha))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Alpha))));
+/// ```
+pub fn alpha1<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar,
+{
+  input.split_at_position1_complete(|item| !item.is_alpha(), ErrorKind::Alpha)
+}
+
+/// Recognizes zero or more ASCII numerical characters: 0-9
+///
+/// *Complete version*: Will return an error if there's not enough input data,
+/// or the whole input if no terminating token is found (a non digit character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::ErrorKind, IResult, Needed};
+/// # use nom::character::complete::digit0;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     digit0(input)
+/// }
+///
+/// assert_eq!(parser("21c"), Ok(("c", "21")));
+/// assert_eq!(parser("21"), Ok(("", "21")));
+/// assert_eq!(parser("a21c"), Ok(("a21c", "")));
+/// assert_eq!(parser(""), Ok(("", "")));
+/// ```
+pub fn digit0<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar,
+{
+  input.split_at_position_complete(|item| !item.is_dec_digit())
+}
+
+/// Recognizes one or more ASCII numerical characters: 0-9
+///
+/// *Complete version*: Will return an error if there's not enough input data,
+/// or the whole input if no terminating token is found (a non digit character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::character::complete::digit1;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     digit1(input)
+/// }
+///
+/// assert_eq!(parser("21c"), Ok(("c", "21")));
+/// assert_eq!(parser("c1"), Err(Err::Error(Error::new("c1", ErrorKind::Digit))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Digit))));
+/// ```
+///
+/// ## Parsing an integer
+/// You can use `digit1` in combination with [`map_res`] to parse an integer:
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::combinator::map_res;
+/// # use nom::character::complete::digit1;
+/// fn parser(input: &str) -> IResult<&str, u32> {
+///   map_res(digit1, str::parse)(input)
+/// }
+///
+/// assert_eq!(parser("416"), Ok(("", 416)));
+/// assert_eq!(parser("12b"), Ok(("b", 12)));
+/// assert!(parser("b").is_err());
+/// ```
+///
+/// [`map_res`]: crate::combinator::map_res
+pub fn digit1<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar,
+{
+  input.split_at_position1_complete(|item| !item.is_dec_digit(), ErrorKind::Digit)
+}
+
+/// Recognizes zero or more ASCII hexadecimal numerical characters: 0-9, A-F, a-f
+///
+/// *Complete version*: Will return the whole input if no terminating token is found (a non hexadecimal digit character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::ErrorKind, IResult, Needed};
+/// # use nom::character::complete::hex_digit0;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     hex_digit0(input)
+/// }
+///
+/// assert_eq!(parser("21cZ"), Ok(("Z", "21c")));
+/// assert_eq!(parser("Z21c"), Ok(("Z21c", "")));
+/// assert_eq!(parser(""), Ok(("", "")));
+/// ```
+pub fn hex_digit0<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar,
+{
+  input.split_at_position_complete(|item| !item.is_hex_digit())
+}
+/// Recognizes one or more ASCII hexadecimal numerical characters: 0-9, A-F, a-f
+///
+/// *Complete version*: Will return an error if there's not enough input data,
+/// or the whole input if no terminating token is found (a non hexadecimal digit character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::character::complete::hex_digit1;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     hex_digit1(input)
+/// }
+///
+/// assert_eq!(parser("21cZ"), Ok(("Z", "21c")));
+/// assert_eq!(parser("H2"), Err(Err::Error(Error::new("H2", ErrorKind::HexDigit))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::HexDigit))));
+/// ```
+pub fn hex_digit1<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar,
+{
+  input.split_at_position1_complete(|item| !item.is_hex_digit(), ErrorKind::HexDigit)
+}
+
+/// Recognizes zero or more octal characters: 0-7
+///
+/// *Complete version*: Will return the whole input if no terminating token is found (a non octal
+/// digit character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::ErrorKind, IResult, Needed};
+/// # use nom::character::complete::oct_digit0;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     oct_digit0(input)
+/// }
+///
+/// assert_eq!(parser("21cZ"), Ok(("cZ", "21")));
+/// assert_eq!(parser("Z21c"), Ok(("Z21c", "")));
+/// assert_eq!(parser(""), Ok(("", "")));
+/// ```
+pub fn oct_digit0<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar,
+{
+  input.split_at_position_complete(|item| !item.is_oct_digit())
+}
+
+/// Recognizes one or more octal characters: 0-7
+///
+/// *Complete version*: Will return an error if there's not enough input data,
+/// or the whole input if no terminating token is found (a non octal digit character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::character::complete::oct_digit1;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     oct_digit1(input)
+/// }
+///
+/// assert_eq!(parser("21cZ"), Ok(("cZ", "21")));
+/// assert_eq!(parser("H2"), Err(Err::Error(Error::new("H2", ErrorKind::OctDigit))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::OctDigit))));
+/// ```
+pub fn oct_digit1<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar,
+{
+  input.split_at_position1_complete(|item| !item.is_oct_digit(), ErrorKind::OctDigit)
+}
+
+/// Recognizes zero or more ASCII numerical and alphabetic characters: 0-9, a-z, A-Z
+///
+/// *Complete version*: Will return the whole input if no terminating token is found (a non
+/// alphanumerical character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::ErrorKind, IResult, Needed};
+/// # use nom::character::complete::alphanumeric0;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     alphanumeric0(input)
+/// }
+///
+/// assert_eq!(parser("21cZ%1"), Ok(("%1", "21cZ")));
+/// assert_eq!(parser("&Z21c"), Ok(("&Z21c", "")));
+/// assert_eq!(parser(""), Ok(("", "")));
+/// ```
+pub fn alphanumeric0<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar,
+{
+  input.split_at_position_complete(|item| !item.is_alphanum())
+}
+
+/// Recognizes one or more ASCII numerical and alphabetic characters: 0-9, a-z, A-Z
+///
+/// *Complete version*: Will return an error if there's not enough input data,
+/// or the whole input if no terminating token is found (a non alphanumerical character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::character::complete::alphanumeric1;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     alphanumeric1(input)
+/// }
+///
+/// assert_eq!(parser("21cZ%1"), Ok(("%1", "21cZ")));
+/// assert_eq!(parser("&H2"), Err(Err::Error(Error::new("&H2", ErrorKind::AlphaNumeric))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::AlphaNumeric))));
+/// ```
+pub fn alphanumeric1<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar,
+{
+  input.split_at_position1_complete(|item| !item.is_alphanum(), ErrorKind::AlphaNumeric)
+}
+
+/// Recognizes zero or more spaces and tabs.
+///
+/// *Complete version*: Will return the whole input if no terminating token is found (a non space
+/// character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::ErrorKind, IResult, Needed};
+/// # use nom::character::complete::space0;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     space0(input)
+/// }
+///
+/// assert_eq!(parser(" \t21c"), Ok(("21c", " \t")));
+/// assert_eq!(parser("Z21c"), Ok(("Z21c", "")));
+/// assert_eq!(parser(""), Ok(("", "")));
+/// ```
+pub fn space0<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar + Clone,
+{
+  input.split_at_position_complete(|item| {
+    let c = item.as_char();
+    !(c == ' ' || c == '\t')
+  })
+}
+
+/// Recognizes one or more spaces and tabs.
+///
+/// *Complete version*: Will return an error if there's not enough input data,
+/// or the whole input if no terminating token is found (a non space character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::character::complete::space1;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     space1(input)
+/// }
+///
+/// assert_eq!(parser(" \t21c"), Ok(("21c", " \t")));
+/// assert_eq!(parser("H2"), Err(Err::Error(Error::new("H2", ErrorKind::Space))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Space))));
+/// ```
+pub fn space1<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar + Clone,
+{
+  input.split_at_position1_complete(
+    |item| {
+      let c = item.as_char();
+      !(c == ' ' || c == '\t')
+    },
+    ErrorKind::Space,
+  )
+}
+
+/// Recognizes zero or more spaces, tabs, carriage returns and line feeds.
+///
+/// *Complete version*: will return the whole input if no terminating token is found (a non space
+/// character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::ErrorKind, IResult, Needed};
+/// # use nom::character::complete::multispace0;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     multispace0(input)
+/// }
+///
+/// assert_eq!(parser(" \t\n\r21c"), Ok(("21c", " \t\n\r")));
+/// assert_eq!(parser("Z21c"), Ok(("Z21c", "")));
+/// assert_eq!(parser(""), Ok(("", "")));
+/// ```
+pub fn multispace0<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar + Clone,
+{
+  input.split_at_position_complete(|item| {
+    let c = item.as_char();
+    !(c == ' ' || c == '\t' || c == '\r' || c == '\n')
+  })
+}
+
+/// Recognizes one or more spaces, tabs, carriage returns and line feeds.
+///
+/// *Complete version*: will return an error if there's not enough input data,
+/// or the whole input if no terminating token is found (a non space character).
+/// # Example
+///
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::character::complete::multispace1;
+/// fn parser(input: &str) -> IResult<&str, &str> {
+///     multispace1(input)
+/// }
+///
+/// assert_eq!(parser(" \t\n\r21c"), Ok(("21c", " \t\n\r")));
+/// assert_eq!(parser("H2"), Err(Err::Error(Error::new("H2", ErrorKind::MultiSpace))));
+/// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::MultiSpace))));
+/// ```
+pub fn multispace1<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
+where
+  T: InputTakeAtPosition,
+  <T as InputTakeAtPosition>::Item: AsChar + Clone,
+{
+  input.split_at_position1_complete(
+    |item| {
+      let c = item.as_char();
+      !(c == ' ' || c == '\t' || c == '\r' || c == '\n')
+    },
+    ErrorKind::MultiSpace,
+  )
+}
+
+pub(crate) fn sign<T, E: ParseError<T>>(input: T) -> IResult<T, bool, E>
+where
+  T: Clone + InputTake,
+  T: for<'a> Compare<&'a [u8]>,
+{
+  use crate::bytes::complete::tag;
+  use crate::combinator::value;
+
+  let (i, opt_sign) = opt(alt((
+    value(false, tag(&b"-"[..])),
+    value(true, tag(&b"+"[..])),
+  )))(input)?;
+  let sign = opt_sign.unwrap_or(true);
+
+  Ok((i, sign))
+}
+
+#[doc(hidden)]
+macro_rules! ints {
+    ($($t:tt)+) => {
+        $(
+        /// will parse a number in text form to a number
+        ///
+        /// *Complete version*: can parse until the end of input.
+        pub fn $t<T, E: ParseError<T>>(input: T) -> IResult<T, $t, E>
+            where
+            T: InputIter + Slice<RangeFrom<usize>> + InputLength + InputTake + Clone,
+            <T as InputIter>::Item: AsChar,
+            T: for <'a> Compare<&'a[u8]>,
+            {
+                let (i, sign) = sign(input.clone())?;
+
+                if i.input_len() == 0 {
+                    return Err(Err::Error(E::from_error_kind(input, ErrorKind::Digit)));
+                }
+
+                let mut value: $t = 0;
+                if sign {
+                    for (pos, c) in i.iter_indices() {
+                        match c.as_char().to_digit(10) {
+                            None => {
+                                if pos == 0 {
+                                    return Err(Err::Error(E::from_error_kind(input, ErrorKind::Digit)));
+                                } else {
+                                    return Ok((i.slice(pos..), value));
+                                }
+                            },
+                            Some(d) => match value.checked_mul(10).and_then(|v| v.checked_add(d as $t)) {
+                                None => return Err(Err::Error(E::from_error_kind(input, ErrorKind::Digit))),
+                                Some(v) => value = v,
+                            }
+                        }
+                    }
+                } else {
+                    for (pos, c) in i.iter_indices() {
+                        match c.as_char().to_digit(10) {
+                            None => {
+                                if pos == 0 {
+                                    return Err(Err::Error(E::from_error_kind(input, ErrorKind::Digit)));
+                                } else {
+                                    return Ok((i.slice(pos..), value));
+                                }
+                            },
+                            Some(d) => match value.checked_mul(10).and_then(|v| v.checked_sub(d as $t)) {
+                                None => return Err(Err::Error(E::from_error_kind(input, ErrorKind::Digit))),
+                                Some(v) => value = v,
+                            }
+                        }
+                    }
+                }
+
+                Ok((i.slice(i.input_len()..), value))
+            }
+        )+
+    }
+}
+
+ints! { i8 i16 i32 i64 i128 }
+
+#[doc(hidden)]
+macro_rules! uints {
+    ($($t:tt)+) => {
+        $(
+        /// will parse a number in text form to a number
+        ///
+        /// *Complete version*: can parse until the end of input.
+        pub fn $t<T, E: ParseError<T>>(input: T) -> IResult<T, $t, E>
+            where
+            T: InputIter + Slice<RangeFrom<usize>> + InputLength,
+            <T as InputIter>::Item: AsChar,
+            {
+                let i = input;
+
+                if i.input_len() == 0 {
+                    return Err(Err::Error(E::from_error_kind(i, ErrorKind::Digit)));
+                }
+
+                let mut value: $t = 0;
+                for (pos, c) in i.iter_indices() {
+                    match c.as_char().to_digit(10) {
+                        None => {
+                            if pos == 0 {
+                                return Err(Err::Error(E::from_error_kind(i, ErrorKind::Digit)));
+                            } else {
+                                return Ok((i.slice(pos..), value));
+                            }
+                        },
+                        Some(d) => match value.checked_mul(10).and_then(|v| v.checked_add(d as $t)) {
+                            None => return Err(Err::Error(E::from_error_kind(i, ErrorKind::Digit))),
+                            Some(v) => value = v,
+                        }
+                    }
+                }
+
+                Ok((i.slice(i.input_len()..), value))
+            }
+        )+
+    }
+}
+
+uints! { u8 u16 u32 u64 u128 }
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+  use crate::internal::Err;
+  use crate::traits::ParseTo;
+  use proptest::prelude::*;
+
+  macro_rules! assert_parse(
+    ($left: expr, $right: expr) => {
+      let res: $crate::IResult<_, _, (_, ErrorKind)> = $left;
+      assert_eq!(res, $right);
+    };
+  );
+
+  #[test]
+  fn character() {
+    let empty: &[u8] = b"";
+    let a: &[u8] = b"abcd";
+    let b: &[u8] = b"1234";
+    let c: &[u8] = b"a123";
+    let d: &[u8] = "azé12".as_bytes();
+    let e: &[u8] = b" ";
+    let f: &[u8] = b" ;";
+    //assert_eq!(alpha1::<_, (_, ErrorKind)>(a), Err(Err::Incomplete(Needed::Size(1))));
+    assert_parse!(alpha1(a), Ok((empty, a)));
+    assert_eq!(alpha1(b), Err(Err::Error((b, ErrorKind::Alpha))));
+    assert_eq!(alpha1::<_, (_, ErrorKind)>(c), Ok((&c[1..], &b"a"[..])));
+    assert_eq!(
+      alpha1::<_, (_, ErrorKind)>(d),
+      Ok(("é12".as_bytes(), &b"az"[..]))
+    );
+    assert_eq!(digit1(a), Err(Err::Error((a, ErrorKind::Digit))));
+    assert_eq!(digit1::<_, (_, ErrorKind)>(b), Ok((empty, b)));
+    assert_eq!(digit1(c), Err(Err::Error((c, ErrorKind::Digit))));
+    assert_eq!(digit1(d), Err(Err::Error((d, ErrorKind::Digit))));
+    assert_eq!(hex_digit1::<_, (_, ErrorKind)>(a), Ok((empty, a)));
+    assert_eq!(hex_digit1::<_, (_, ErrorKind)>(b), Ok((empty, b)));
+    assert_eq!(hex_digit1::<_, (_, ErrorKind)>(c), Ok((empty, c)));
+    assert_eq!(
+      hex_digit1::<_, (_, ErrorKind)>(d),
+      Ok(("zé12".as_bytes(), &b"a"[..]))
+    );
+    assert_eq!(hex_digit1(e), Err(Err::Error((e, ErrorKind::HexDigit))));
+    assert_eq!(oct_digit1(a), Err(Err::Error((a, ErrorKind::OctDigit))));
+    assert_eq!(oct_digit1::<_, (_, ErrorKind)>(b), Ok((empty, b)));
+    assert_eq!(oct_digit1(c), Err(Err::Error((c, ErrorKind::OctDigit))));
+    assert_eq!(oct_digit1(d), Err(Err::Error((d, ErrorKind::OctDigit))));
+    assert_eq!(alphanumeric1::<_, (_, ErrorKind)>(a), Ok((empty, a)));
+    //assert_eq!(fix_error!(b,(), alphanumeric), Ok((empty, b)));
+    assert_eq!(alphanumeric1::<_, (_, ErrorKind)>(c), Ok((empty, c)));
+    assert_eq!(
+      alphanumeric1::<_, (_, ErrorKind)>(d),
+      Ok(("é12".as_bytes(), &b"az"[..]))
+    );
+    assert_eq!(space1::<_, (_, ErrorKind)>(e), Ok((empty, e)));
+    assert_eq!(space1::<_, (_, ErrorKind)>(f), Ok((&b";"[..], &b" "[..])));
+  }
+
+  #[cfg(feature = "alloc")]
+  #[test]
+  fn character_s() {
+    let empty = "";
+    let a = "abcd";
+    let b = "1234";
+    let c = "a123";
+    let d = "azé12";
+    let e = " ";
+    assert_eq!(alpha1::<_, (_, ErrorKind)>(a), Ok((empty, a)));
+    assert_eq!(alpha1(b), Err(Err::Error((b, ErrorKind::Alpha))));
+    assert_eq!(alpha1::<_, (_, ErrorKind)>(c), Ok((&c[1..], &"a"[..])));
+    assert_eq!(alpha1::<_, (_, ErrorKind)>(d), Ok(("é12", &"az"[..])));
+    assert_eq!(digit1(a), Err(Err::Error((a, ErrorKind::Digit))));
+    assert_eq!(digit1::<_, (_, ErrorKind)>(b), Ok((empty, b)));
+    assert_eq!(digit1(c), Err(Err::Error((c, ErrorKind::Digit))));
+    assert_eq!(digit1(d), Err(Err::Error((d, ErrorKind::Digit))));
+    assert_eq!(hex_digit1::<_, (_, ErrorKind)>(a), Ok((empty, a)));
+    assert_eq!(hex_digit1::<_, (_, ErrorKind)>(b), Ok((empty, b)));
+    assert_eq!(hex_digit1::<_, (_, ErrorKind)>(c), Ok((empty, c)));
+    assert_eq!(hex_digit1::<_, (_, ErrorKind)>(d), Ok(("zé12", &"a"[..])));
+    assert_eq!(hex_digit1(e), Err(Err::Error((e, ErrorKind::HexDigit))));
+    assert_eq!(oct_digit1(a), Err(Err::Error((a, ErrorKind::OctDigit))));
+    assert_eq!(oct_digit1::<_, (_, ErrorKind)>(b), Ok((empty, b)));
+    assert_eq!(oct_digit1(c), Err(Err::Error((c, ErrorKind::OctDigit))));
+    assert_eq!(oct_digit1(d), Err(Err::Error((d, ErrorKind::OctDigit))));
+    assert_eq!(alphanumeric1::<_, (_, ErrorKind)>(a), Ok((empty, a)));
+    //assert_eq!(fix_error!(b,(), alphanumeric), Ok((empty, b)));
+    assert_eq!(alphanumeric1::<_, (_, ErrorKind)>(c), Ok((empty, c)));
+    assert_eq!(alphanumeric1::<_, (_, ErrorKind)>(d), Ok(("é12", "az")));
+    assert_eq!(space1::<_, (_, ErrorKind)>(e), Ok((empty, e)));
+  }
+
+  use crate::traits::Offset;
+  #[test]
+  fn offset() {
+    let a = &b"abcd;"[..];
+    let b = &b"1234;"[..];
+    let c = &b"a123;"[..];
+    let d = &b" \t;"[..];
+    let e = &b" \t\r\n;"[..];
+    let f = &b"123abcDEF;"[..];
+
+    match alpha1::<_, (_, ErrorKind)>(a) {
+      Ok((i, _)) => {
+        assert_eq!(a.offset(i) + i.len(), a.len());
+      }
+      _ => panic!("wrong return type in offset test for alpha"),
+    }
+    match digit1::<_, (_, ErrorKind)>(b) {
+      Ok((i, _)) => {
+        assert_eq!(b.offset(i) + i.len(), b.len());
+      }
+      _ => panic!("wrong return type in offset test for digit"),
+    }
+    match alphanumeric1::<_, (_, ErrorKind)>(c) {
+      Ok((i, _)) => {
+        assert_eq!(c.offset(i) + i.len(), c.len());
+      }
+      _ => panic!("wrong return type in offset test for alphanumeric"),
+    }
+    match space1::<_, (_, ErrorKind)>(d) {
+      Ok((i, _)) => {
+        assert_eq!(d.offset(i) + i.len(), d.len());
+      }
+      _ => panic!("wrong return type in offset test for space"),
+    }
+    match multispace1::<_, (_, ErrorKind)>(e) {
+      Ok((i, _)) => {
+        assert_eq!(e.offset(i) + i.len(), e.len());
+      }
+      _ => panic!("wrong return type in offset test for multispace"),
+    }
+    match hex_digit1::<_, (_, ErrorKind)>(f) {
+      Ok((i, _)) => {
+        assert_eq!(f.offset(i) + i.len(), f.len());
+      }
+      _ => panic!("wrong return type in offset test for hex_digit"),
+    }
+    match oct_digit1::<_, (_, ErrorKind)>(f) {
+      Ok((i, _)) => {
+        assert_eq!(f.offset(i) + i.len(), f.len());
+      }
+      _ => panic!("wrong return type in offset test for oct_digit"),
+    }
+  }
+
+  #[test]
+  fn is_not_line_ending_bytes() {
+    let a: &[u8] = b"ab12cd\nefgh";
+    assert_eq!(
+      not_line_ending::<_, (_, ErrorKind)>(a),
+      Ok((&b"\nefgh"[..], &b"ab12cd"[..]))
+    );
+
+    let b: &[u8] = b"ab12cd\nefgh\nijkl";
+    assert_eq!(
+      not_line_ending::<_, (_, ErrorKind)>(b),
+      Ok((&b"\nefgh\nijkl"[..], &b"ab12cd"[..]))
+    );
+
+    let c: &[u8] = b"ab12cd\r\nefgh\nijkl";
+    assert_eq!(
+      not_line_ending::<_, (_, ErrorKind)>(c),
+      Ok((&b"\r\nefgh\nijkl"[..], &b"ab12cd"[..]))
+    );
+
+    let d: &[u8] = b"ab12cd";
+    assert_eq!(
+      not_line_ending::<_, (_, ErrorKind)>(d),
+      Ok((&[][..], &d[..]))
+    );
+  }
+
+  #[test]
+  fn is_not_line_ending_str() {
+    /*
+    let a: &str = "ab12cd\nefgh";
+    assert_eq!(not_line_ending(a), Ok((&"\nefgh"[..], &"ab12cd"[..])));
+
+    let b: &str = "ab12cd\nefgh\nijkl";
+    assert_eq!(not_line_ending(b), Ok((&"\nefgh\nijkl"[..], &"ab12cd"[..])));
+
+    let c: &str = "ab12cd\r\nefgh\nijkl";
+    assert_eq!(not_line_ending(c), Ok((&"\r\nefgh\nijkl"[..], &"ab12cd"[..])));
+
+    let d = "βèƒôřè\nÂßÇáƒƭèř";
+    assert_eq!(not_line_ending(d), Ok((&"\nÂßÇáƒƭèř"[..], &"βèƒôřè"[..])));
+
+    let e = "βèƒôřè\r\nÂßÇáƒƭèř";
+    assert_eq!(not_line_ending(e), Ok((&"\r\nÂßÇáƒƭèř"[..], &"βèƒôřè"[..])));
+    */
+
+    let f = "βèƒôřè\rÂßÇáƒƭèř";
+    assert_eq!(not_line_ending(f), Err(Err::Error((f, ErrorKind::Tag))));
+
+    let g2: &str = "ab12cd";
+    assert_eq!(not_line_ending::<_, (_, ErrorKind)>(g2), Ok(("", g2)));
+  }
+
+  #[test]
+  fn hex_digit_test() {
+    let i = &b"0123456789abcdefABCDEF;"[..];
+    assert_parse!(hex_digit1(i), Ok((&b";"[..], &i[..i.len() - 1])));
+
+    let i = &b"g"[..];
+    assert_parse!(
+      hex_digit1(i),
+      Err(Err::Error(error_position!(i, ErrorKind::HexDigit)))
+    );
+
+    let i = &b"G"[..];
+    assert_parse!(
+      hex_digit1(i),
+      Err(Err::Error(error_position!(i, ErrorKind::HexDigit)))
+    );
+
+    assert!(crate::character::is_hex_digit(b'0'));
+    assert!(crate::character::is_hex_digit(b'9'));
+    assert!(crate::character::is_hex_digit(b'a'));
+    assert!(crate::character::is_hex_digit(b'f'));
+    assert!(crate::character::is_hex_digit(b'A'));
+    assert!(crate::character::is_hex_digit(b'F'));
+    assert!(!crate::character::is_hex_digit(b'g'));
+    assert!(!crate::character::is_hex_digit(b'G'));
+    assert!(!crate::character::is_hex_digit(b'/'));
+    assert!(!crate::character::is_hex_digit(b':'));
+    assert!(!crate::character::is_hex_digit(b'@'));
+    assert!(!crate::character::is_hex_digit(b'\x60'));
+  }
+
+  #[test]
+  fn oct_digit_test() {
+    let i = &b"01234567;"[..];
+    assert_parse!(oct_digit1(i), Ok((&b";"[..], &i[..i.len() - 1])));
+
+    let i = &b"8"[..];
+    assert_parse!(
+      oct_digit1(i),
+      Err(Err::Error(error_position!(i, ErrorKind::OctDigit)))
+    );
+
+    assert!(crate::character::is_oct_digit(b'0'));
+    assert!(crate::character::is_oct_digit(b'7'));
+    assert!(!crate::character::is_oct_digit(b'8'));
+    assert!(!crate::character::is_oct_digit(b'9'));
+    assert!(!crate::character::is_oct_digit(b'a'));
+    assert!(!crate::character::is_oct_digit(b'A'));
+    assert!(!crate::character::is_oct_digit(b'/'));
+    assert!(!crate::character::is_oct_digit(b':'));
+    assert!(!crate::character::is_oct_digit(b'@'));
+    assert!(!crate::character::is_oct_digit(b'\x60'));
+  }
+
+  #[test]
+  fn full_line_windows() {
+    use crate::sequence::pair;
+    fn take_full_line(i: &[u8]) -> IResult<&[u8], (&[u8], &[u8])> {
+      pair(not_line_ending, line_ending)(i)
+    }
+    let input = b"abc\r\n";
+    let output = take_full_line(input);
+    assert_eq!(output, Ok((&b""[..], (&b"abc"[..], &b"\r\n"[..]))));
+  }
+
+  #[test]
+  fn full_line_unix() {
+    use crate::sequence::pair;
+    fn take_full_line(i: &[u8]) -> IResult<&[u8], (&[u8], &[u8])> {
+      pair(not_line_ending, line_ending)(i)
+    }
+    let input = b"abc\n";
+    let output = take_full_line(input);
+    assert_eq!(output, Ok((&b""[..], (&b"abc"[..], &b"\n"[..]))));
+  }
+
+  #[test]
+  fn check_windows_lineending() {
+    let input = b"\r\n";
+    let output = line_ending(&input[..]);
+    assert_parse!(output, Ok((&b""[..], &b"\r\n"[..])));
+  }
+
+  #[test]
+  fn check_unix_lineending() {
+    let input = b"\n";
+    let output = line_ending(&input[..]);
+    assert_parse!(output, Ok((&b""[..], &b"\n"[..])));
+  }
+
+  #[test]
+  fn cr_lf() {
+    assert_parse!(crlf(&b"\r\na"[..]), Ok((&b"a"[..], &b"\r\n"[..])));
+    assert_parse!(
+      crlf(&b"\r"[..]),
+      Err(Err::Error(error_position!(&b"\r"[..], ErrorKind::CrLf)))
+    );
+    assert_parse!(
+      crlf(&b"\ra"[..]),
+      Err(Err::Error(error_position!(&b"\ra"[..], ErrorKind::CrLf)))
+    );
+
+    assert_parse!(crlf("\r\na"), Ok(("a", "\r\n")));
+    assert_parse!(
+      crlf("\r"),
+      Err(Err::Error(error_position!(&"\r"[..], ErrorKind::CrLf)))
+    );
+    assert_parse!(
+      crlf("\ra"),
+      Err(Err::Error(error_position!("\ra", ErrorKind::CrLf)))
+    );
+  }
+
+  #[test]
+  fn end_of_line() {
+    assert_parse!(line_ending(&b"\na"[..]), Ok((&b"a"[..], &b"\n"[..])));
+    assert_parse!(line_ending(&b"\r\na"[..]), Ok((&b"a"[..], &b"\r\n"[..])));
+    assert_parse!(
+      line_ending(&b"\r"[..]),
+      Err(Err::Error(error_position!(&b"\r"[..], ErrorKind::CrLf)))
+    );
+    assert_parse!(
+      line_ending(&b"\ra"[..]),
+      Err(Err::Error(error_position!(&b"\ra"[..], ErrorKind::CrLf)))
+    );
+
+    assert_parse!(line_ending("\na"), Ok(("a", "\n")));
+    assert_parse!(line_ending("\r\na"), Ok(("a", "\r\n")));
+    assert_parse!(
+      line_ending("\r"),
+      Err(Err::Error(error_position!(&"\r"[..], ErrorKind::CrLf)))
+    );
+    assert_parse!(
+      line_ending("\ra"),
+      Err(Err::Error(error_position!("\ra", ErrorKind::CrLf)))
+    );
+  }
+
+  fn digit_to_i16(input: &str) -> IResult<&str, i16> {
+    let i = input;
+    let (i, opt_sign) = opt(alt((char('+'), char('-'))))(i)?;
+    let sign = match opt_sign {
+      Some('+') => true,
+      Some('-') => false,
+      _ => true,
+    };
+
+    let (i, s) = match digit1::<_, crate::error::Error<_>>(i) {
+      Ok((i, s)) => (i, s),
+      Err(_) => {
+        return Err(Err::Error(crate::error::Error::from_error_kind(
+          input,
+          ErrorKind::Digit,
+        )))
+      }
+    };
+
+    match s.parse_to() {
+      Some(n) => {
+        if sign {
+          Ok((i, n))
+        } else {
+          Ok((i, -n))
+        }
+      }
+      None => Err(Err::Error(crate::error::Error::from_error_kind(
+        i,
+        ErrorKind::Digit,
+      ))),
+    }
+  }
+
+  fn digit_to_u32(i: &str) -> IResult<&str, u32> {
+    let (i, s) = digit1(i)?;
+    match s.parse_to() {
+      Some(n) => Ok((i, n)),
+      None => Err(Err::Error(crate::error::Error::from_error_kind(
+        i,
+        ErrorKind::Digit,
+      ))),
+    }
+  }
+
+  proptest! {
+    #[test]
+    fn ints(s in "\\PC*") {
+        let res1 = digit_to_i16(&s);
+        let res2 = i16(s.as_str());
+        assert_eq!(res1, res2);
+    }
+
+    #[test]
+    fn uints(s in "\\PC*") {
+        let res1 = digit_to_u32(&s);
+        let res2 = u32(s.as_str());
+        assert_eq!(res1, res2);
+    }
+  }
+}