Enum combine::error::Consumed[−][src]

Returns true if self is empty.

Extracts the contained value.

Converts self into the Consumed state.

Converts self into the Empty state.

Maps over the contained value without changing the consumed state.

Combines the Consumed flags from self and the result of f.

Empty    <> Empty    -> Empty
Consumed <> Empty    -> Consumed
Empty    <> Consumed -> Consumed
Consumed <> Consumed -> Consumed

//Parses a character of string literal and handles the escaped characters \\ and \" as \
//and " respectively
fn char<I>(input: &mut I) -> ParseResult<char, I>
    where I: Stream<Item = char>,
          I::Error: ParseError<I::Item, I::Range, I::Position>,
{
    let (c, consumed) = try!(satisfy(|c| c != '"').parse_stream(input));
    match c {
        //Since the `char` parser has already consumed some of the input `combine` is used
        //propagate the consumed state to the next part of the parser
        '\\' => consumed.combine(|_| {
            satisfy(|c| c == '"' || c == '\\')
                .map(|c| {
                    match c {
                        '"' => '"',
                        '\\' => '\\',
                        c => c
                    }
                })
                .parse_stream(input)
            }),
        _ => Ok((c, consumed))
    }
}
let result = many(parser(char))
    .easy_parse(r#"abc\"\\"#);
assert_eq!(result, Ok((r#"abc"\"#.to_string(), "")));
}