[][src]Enum combine::error::Consumed

pub enum Consumed<T> {
    Consumed(T),
    Empty(T),
}

Enum used to indicate if a parser consumed any items of the stream it was given as an input.

This is used by parsers such as or and choice to determine if they should try to parse with another parser as they will only be able to provide good error reporting if the preceding parser did not consume any tokens.

Variants

Consumed(T)

Constructor indicating that the parser has consumed elements

Empty(T)

Constructor indicating that the parser did not consume any elements

Methods

impl<T> Consumed<T>[src]

pub fn is_empty(&self) -> bool[src]

Returns true if self is empty.

pub fn into_inner(self) -> T[src]

Extracts the contained value.

pub fn into_consumed(self) -> Consumed<T>[src]

Converts self into the Consumed state.

pub fn into_empty(self) -> Consumed<T>[src]

Converts self into the Empty state.

pub fn map<F, U>(self, f: F) -> Consumed<U> where
    F: FnOnce(T) -> U, 
[src]

Maps over the contained value without changing the consumed state.

pub fn merge(&self, current: Consumed<T>) -> Consumed<T>[src]

pub fn combine<F, U, E>(self, f: F) -> ParseResult2<U, E> where
    F: FnOnce(T) -> ParseResult2<U, E>, 
[src]

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(), "")));
}

pub fn combine_consumed<F, U, E>(self, f: F) -> FastResult<U, E> where
    F: FnOnce(T) -> FastResult<U, E>, 
[src]

Trait Implementations

impl<T> AsMut<T> for Consumed<T>[src]

impl<T: PartialEq> PartialEq<Consumed<T>> for Consumed<T>[src]

impl<T> AsRef<T> for Consumed<T>[src]

impl<T: Clone> Clone for Consumed<T>[src]

fn clone_from(&mut self, source: &Self)
1.0.0
[src]

Performs copy-assignment from source. Read more

impl<T: Copy> Copy for Consumed<T>[src]

impl<T: Debug> Debug for Consumed<T>[src]

Auto Trait Implementations

impl<T> Send for Consumed<T> where
    T: Send

impl<T> Sync for Consumed<T> where
    T: Sync

Blanket Implementations

impl<T> From for T[src]

impl<T, U> Into for T where
    U: From<T>, 
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

type Error = !

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized
[src]

impl<T> BorrowMut for T where
    T: ?Sized
[src]

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Any for T where
    T: 'static + ?Sized
[src]