Trait combine::Parser [] [src]

pub trait Parser {
    type Input: Stream;
    type Output;
    type PartialState: Default;
    fn easy_parse<I>(
        &mut self,
        input: I
    ) -> Result<(Self::Output, I), ParseError<I>>
    where
        I: Stream,
        Stream<I>: StreamOnce<Item = I::Item, Range = I::Range, Error = ParseError<Stream<I>>, Position = I::Position>,
        I::Position: Default,
        Self: Sized + Parser<Input = Stream<I>>
, { ... }
fn parse(
        &mut self,
        input: Self::Input
    ) -> Result<(Self::Output, Self::Input), <Self::Input as StreamOnce>::Error> { ... }
fn parse_with_state(
        &mut self,
        input: &mut Self::Input,
        state: &mut Self::PartialState
    ) -> Result<Self::Output, <Self::Input as StreamOnce>::Error> { ... }
fn parse_stream(
        &mut self,
        input: &mut Self::Input
    ) -> ParseResult<Self::Output, Self::Input> { ... }
fn parse_stream_consumed(
        &mut self,
        input: &mut Self::Input
    ) -> ConsumedResult<Self::Output, Self::Input> { ... }
fn parse_stream_consumed_partial(
        &mut self,
        input: &mut Self::Input,
        state: &mut Self::PartialState
    ) -> ConsumedResult<Self::Output, Self::Input> { ... }
fn parse_lazy(
        &mut self,
        input: &mut Self::Input
    ) -> ConsumedResult<Self::Output, Self::Input> { ... }
fn parse_first(
        &mut self,
        input: &mut Self::Input,
        state: &mut Self::PartialState
    ) -> ConsumedResult<Self::Output, Self::Input> { ... }
fn parse_partial(
        &mut self,
        input: &mut Self::Input,
        state: &mut Self::PartialState
    ) -> ConsumedResult<Self::Output, Self::Input> { ... }
fn add_error(
        &mut self,
        _error: &mut Tracked<<Self::Input as StreamOnce>::Error>
    ) { ... }
fn by_ref(&mut self) -> &mut Self
    where
        Self: Sized
, { ... }
fn with<P2>(self, p: P2) -> With<Self, P2>
    where
        Self: Sized,
        P2: Parser<Input = Self::Input>
, { ... }
fn skip<P2>(self, p: P2) -> Skip<Self, P2>
    where
        Self: Sized,
        P2: Parser<Input = Self::Input>
, { ... }
fn and<P2>(self, p: P2) -> (Self, P2)
    where
        Self: Sized,
        P2: Parser<Input = Self::Input>
, { ... }
fn or<P2>(self, p: P2) -> Or<Self, P2>
    where
        Self: Sized,
        P2: Parser<Input = Self::Input, Output = Self::Output>
, { ... }
fn then<N, F>(self, f: F) -> Then<Self, F>
    where
        Self: Sized,
        F: FnMut(Self::Output) -> N,
        N: Parser<Input = Self::Input>
, { ... }
fn then_partial<N, F>(self, f: F) -> ThenPartial<Self, F>
    where
        Self: Sized,
        F: FnMut(&mut Self::Output) -> N,
        N: Parser<Input = Self::Input>
, { ... }
fn map<F, B>(self, f: F) -> Map<Self, F>
    where
        Self: Sized,
        F: FnMut(Self::Output) -> B
, { ... }
fn flat_map<F, B>(self, f: F) -> FlatMap<Self, F>
    where
        Self: Sized,
        F: FnMut(Self::Output) -> Result<B, <Self::Input as StreamOnce>::Error>
, { ... }
fn message<S>(self, msg: S) -> Message<Self>
    where
        Self: Sized,
        S: Into<Info<<Self::Input as StreamOnce>::Item, <Self::Input as StreamOnce>::Range>>
, { ... }
fn expected<S>(self, msg: S) -> Expected<Self>
    where
        Self: Sized,
        S: Into<Info<<Self::Input as StreamOnce>::Item, <Self::Input as StreamOnce>::Range>>
, { ... }
fn and_then<F, O, E, I>(self, f: F) -> AndThen<Self, F>
    where
        Self: Parser<Input = I> + Sized,
        F: FnMut(Self::Output) -> Result<O, E>,
        I: Stream,
        E: Into<<I::Error as ParseError<I::Item, I::Range, I::Position>>::StreamError>
, { ... }
fn iter<'a>(
        self,
        input: &'a mut Self::Input
    ) -> Iter<'a, Self, Self::PartialState, FirstMode>
    where
        Self: Parser + Sized
, { ... }
fn partial_iter<'a, 's, M>(
        self,
        mode: M,
        input: &'a mut Self::Input,
        partial_state: &'s mut Self::PartialState
    ) -> Iter<'a, Self, &'s mut Self::PartialState, M>
    where
        Self: Parser + Sized,
        M: ParseMode
, { ... }
fn boxed<'a>(
        self
    ) -> Box<Parser<Input = Self::Input, Output = Self::Output, PartialState = Self::PartialState> + 'a>
    where
        Self: Sized + 'a
, { ... }
fn left<R>(self) -> Either<Self, R>
    where
        Self: Sized,
        R: Parser<Input = Self::Input, Output = Self::Output>
, { ... }
fn right<L>(self) -> Either<L, Self>
    where
        Self: Sized,
        L: Parser<Input = Self::Input, Output = Self::Output>
, { ... } }

By implementing the Parser trait a type says that it can be used to parse an input stream into the type Output.

All methods have a default implementation but there needs to be at least an implementation of parse_stream, parse_stream_consumed, or parse_lazy. If the last is implemented, an implementation of add_error may also be required. See the documentation for parse_lazy for details.

Associated Types

The type which is taken as input for the parser. The type must implement the Stream trait which allows the parser to read items from the type.

The type which is returned if the parser is successful.

Provided Methods

Entry point of the parser. Takes some input and tries to parse it.

Returns the parsed result and the remaining input if the parser succeeds, or a This function wraps requires Self::Input == easy::Stream<I> which makes it return return easy::Errors if an error occurs.

ParseError otherwise.

Entry point of the parser. Takes some input and tries to parse it.

Returns the parsed result and the remaining input if the parser succeeds, or a error otherwise.

Entry point of the parser when using partial parsing. Takes some input and tries to parse it.

Returns the parsed result and the remaining input if the parser succeeds, or a error otherwise.

Parses using the stream input by calling Stream::uncons one or more times.

On success returns Ok((value, new_state)), and on failure returns Err(error). Furthermore new_state and error are wrapped in Consumed, providing information on whether this parser consumed any input data or not.

Parses using the stream input by calling Stream::uncons one or more times.

Semantically equivalent to parse_stream, except this method returns a flattened result type, combining Result and Consumed into a single FastResult.

Parses using the stream input by calling Stream::uncons one or more times.

Specialized version of parse_stream_consumed which permits error value creation to be skipped in the common case.

When this parser returns EmptyErr, this method is allowed to return an empty Error. The error value that would have been returned can instead be obtained by calling add_error. This allows a parent parser such as choice to skip the creation of an unnecessary error value, if an alternative parser succeeds.

External callers should never have to call this function directly.

Parsers should seek to implement this function instead of the above two if errors can be encountered before consuming input. The default implementation always returns all errors, with add_error being a no-op.

Parses using the stream input and allows itself to be resumed at a later point using parse_partial by storing the necessary intermediate state in state.

Unlike parse_partial function this is allowed to assume that there is no partial state to resume.

Parses using the stream input and allows itself to be resumed at a later point using parse_partial by storing the necessary intermediate state in state

Adds the first error that would normally be returned by this parser if it failed with an EmptyErr result.

See parse_lazy for details.

Borrows a parser instead of consuming it.

Used to apply parser combinators on self without losing ownership.

fn test(input: &mut &'static str) -> ParseResult<(char, char), &'static str> {
    let mut p = digit();
    let ((d, _), consumed) = try!((p.by_ref(), letter()).parse_stream(input));
    let (d2, consumed) = try!(consumed.combine(|_| p.parse_stream(input)));
    Ok(((d, d2), consumed))
}

fn main() {
    let mut input = "1a23";
    assert_eq!(
        test(&mut input).map(|(t, c)| (t, c.map(|_| input))),
        Ok((('1', '2'), Consumed::Consumed("3")))
    );
}

Discards the value of the self parser and returns the value of p. Fails if any of the parsers fails.

let result = digit()
    .with(token('i'))
    .parse("9i")
    .map(|x| x.0);
assert_eq!(result, Ok('i'));

Discards the value of the p parser and returns the value of self. Fails if any of the parsers fails.

let result = digit()
    .skip(token('i'))
    .parse("9i")
    .map(|x| x.0);
assert_eq!(result, Ok('9'));

Parses with self followed by p. Succeeds if both parsers succeed, otherwise fails. Returns a tuple with both values on success.

let result = digit()
    .and(token('i'))
    .parse("9i")
    .map(|x| x.0);
assert_eq!(result, Ok(('9', 'i')));

Returns a parser which attempts to parse using self. If self fails without consuming any input it tries to consume the same input using p.

If you are looking to chain 3 or more parsers using or you may consider using the choice! macro instead, which can be clearer and may result in a faster parser.

let mut parser = string("let")
    .or(digit().map(|_| "digit"))
    .or(string("led"));
assert_eq!(parser.parse("let"), Ok(("let", "")));
assert_eq!(parser.parse("1"), Ok(("digit", "")));
assert!(parser.parse("led").is_err());

let mut parser2 = string("two").or(string("three"));
// Fails as the parser for "two" consumes the first 't' before failing
assert!(parser2.parse("three").is_err());

// Use 'try' to make failing parsers always act as if they have not consumed any input
let mut parser3 = try(string("two")).or(try(string("three")));
assert_eq!(parser3.parse("three"), Ok(("three", "")));

Parses using self and then passes the value to f which returns a parser used to parse the rest of the input.

Since the parser returned from f must have a single type it can be useful to use the left and right methods to merge parsers of differing types into one.

If you are using partial parsing you may want to use partial_then instead.

let result = digit()
    .then(|d| {
        if d == '9' {
            value(9).left()
        }
        else {
            unexpected(d).map(|_| 0).message("Not a nine").right()
        }
    })
    .easy_parse("9");
assert_eq!(result, Ok((9, "")));

Variant of then which parses using self and then passes the value to f as a &mut reference.

Useful when doing partial parsing since it does not need to store the parser returned by f in the partial state. Instead it will call f each to request a new parser each time parsing resumes and that parser is needed.

Since the parser returned from f must have a single type it can be useful to use the left and right methods to merge parsers of differing types into one.

let result = digit()
    .then_partial(|d| {
        if *d == '9' {
            value(9).left()
        }
        else {
            unexpected(*d).map(|_| 0).message("Not a nine").right()
        }
    })
    .easy_parse("9");
assert_eq!(result, Ok((9, "")));

Uses f to map over the parsed value.

let result = digit()
    .map(|c| c == '9')
    .parse("9")
    .map(|x| x.0);
assert_eq!(result, Ok(true));

Uses f to map over the output of self. If f returns an error the parser fails.

let result = take(4)
    .flat_map(|bs| many(digit()).parse(bs).map(|t| t.0))
    .parse("12abcd");
assert_eq!(result, Ok((String::from("12"), "cd")));

Parses with self and if it fails, adds the message msg to the error.

let result = token('9')
    .message("Not a nine")
    .easy_parse(State::new("8"));
assert_eq!(result, Err(easy::Errors {
    position: SourcePosition::default(),
    errors: vec![
        easy::Error::Unexpected('8'.into()),
        easy::Error::Expected('9'.into()),
        easy::Error::Message("Not a nine".into())
    ]
}));

Parses with self and if it fails without consuming any input any expected errors are replaced by msg. msg is then used in error messages as "Expected msg".

let result = token('9')
    .expected("nine")
    .easy_parse(State::new("8"));
assert_eq!(result, Err(easy::Errors {
    position: SourcePosition::default(),
    errors: vec![
        easy::Error::Unexpected('8'.into()),
        easy::Error::Expected("nine".into())
    ]
}));

Parses with self and applies f on the result if self parses successfully. f may optionally fail with an error which is automatically converted to a ParseError.

let mut parser = many1(digit())
    .and_then(|s: String| s.parse::<i32>());
let result = parser.easy_parse(State::new("1234")).map(|(x, state)| (x, state.input));
assert_eq!(result, Ok((1234, "")));
let result = parser.easy_parse(State::new("999999999999999999999999"));
assert!(result.is_err());
// Errors are report as if they occured at the start of the parse
assert_eq!(result.unwrap_err().position, SourcePosition { line: 1, column: 1 });

Creates an iterator from a parser and a state. Can be used as an alternative to many when collecting directly into a Extend type is not desirable.

let mut buffer = String::new();
let number = parser(|input| {
    buffer.clear();
    let mut iter = digit().iter(input);
    buffer.extend(&mut iter);
    let i = buffer.parse::<i32>().unwrap();
    iter.into_result(i)
});
let result = sep_by(number, char(','))
    .parse("123,45,6");
assert_eq!(result, Ok((vec![123, 45, 6], "")));

Creates an iterator from a parser and a state. Can be used as an alternative to many when collecting directly into a Extend type is not desirable.

let mut buffer = String::new();
let number = parser(|input| {
    buffer.clear();
    let mut iter = digit().iter(input);
    buffer.extend(&mut iter);
    let i = buffer.parse::<i32>().unwrap();
    iter.into_result(i)
});
let result = sep_by(number, char(','))
    .parse("123,45,6");
assert_eq!(result, Ok((vec![123, 45, 6], "")));

Turns the parser into a trait object by putting it in a Box. Can be used to easily return parsers from functions without naming the type.

fn test<'input, F>(
    c: char,
    f: F)
    -> Box<Parser<Input = &'input str, Output = (char, char), PartialState = ()>>
    where F: FnMut(char) -> bool + 'static
{
    ::combine::combinator::no_partial((token(c), satisfy(f))).boxed()
}
let result = test('a', |c| c >= 'a' && c <= 'f')
    .parse("ac");
assert_eq!(result, Ok((('a', 'c'), "")));

Wraps the parser into the Either enum which allows combinators such as then to return multiple different parser types (merging them to one)

let mut parser = any().then(|c|
    if c == '#' {
        skip_many(satisfy(|c| c != '\n'))
            .with(value("".to_string()))
            .left()
    } else {
        many1(letter())
            .map(move |mut s: String| { s.insert(0, c); s })
            .right()
    });

let result = parser.parse("ac2");
assert_eq!(result, Ok(("ac".to_string(), "2")));

let result = parser.parse("# ac2");
assert_eq!(result, Ok(("".to_string(), "")));

Wraps the parser into the Either enum which allows combinators such as then to return multiple different parser types (merging them to one)

let mut parser = any().then(|c|
    if c == '#' {
        skip_many(satisfy(|c| c != '\n'))
            .with(value("".to_string()))
            .left()
    } else {
        many1(letter())
            .map(move |mut s: String| { s.insert(0, c); s })
            .right()
    });

let result = parser.parse("ac2");
assert_eq!(result, Ok(("ac".to_string(), "2")));

let result = parser.parse("# ac2");
assert_eq!(result, Ok(("".to_string(), "")));

Implementations on Foreign Types

impl<'a, I: Stream, O> Parser for FnMut(&mut I) -> ParseResult<O, I> + 'a
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impl<I, O> Parser for fn(_: &mut I) -> ParseResult<O, I> where
    I: Stream
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impl<L, R> Parser for Either<L, R> where
    L: Parser,
    R: Parser<Input = L::Input, Output = L::Output>, 
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impl<Input: Stream, A, B> Parser for (A, B) where
    Input: Stream,
    Input::Error: ParseError<Input::Item, Input::Range, Input::Position>,
    A: Parser<Input = Input>,
    B: Parser<Input = Input>, 
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impl<Input: Stream, A, B, C> Parser for (A, B, C) where
    Input: Stream,
    Input::Error: ParseError<Input::Item, Input::Range, Input::Position>,
    A: Parser<Input = Input>,
    B: Parser<Input = Input>,
    C: Parser<Input = Input>, 
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impl<Input: Stream, A, B, C, D> Parser for (A, B, C, D) where
    Input: Stream,
    Input::Error: ParseError<Input::Item, Input::Range, Input::Position>,
    A: Parser<Input = Input>,
    B: Parser<Input = Input>,
    C: Parser<Input = Input>,
    D: Parser<Input = Input>, 
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impl<Input: Stream, A, B, C, D, E> Parser for (A, B, C, D, E) where
    Input: Stream,
    Input::Error: ParseError<Input::Item, Input::Range, Input::Position>,
    A: Parser<Input = Input>,
    B: Parser<Input = Input>,
    C: Parser<Input = Input>,
    D: Parser<Input = Input>,
    E: Parser<Input = Input>, 
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impl<Input: Stream, A, B, C, D, E, F> Parser for (A, B, C, D, E, F) where
    Input: Stream,
    Input::Error: ParseError<Input::Item, Input::Range, Input::Position>,
    A: Parser<Input = Input>,
    B: Parser<Input = Input>,
    C: Parser<Input = Input>,
    D: Parser<Input = Input>,
    E: Parser<Input = Input>,
    F: Parser<Input = Input>, 
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impl<Input: Stream, A, B, C, D, E, F, G> Parser for (A, B, C, D, E, F, G) where
    Input: Stream,
    Input::Error: ParseError<Input::Item, Input::Range, Input::Position>,
    A: Parser<Input = Input>,
    B: Parser<Input = Input>,
    C: Parser<Input = Input>,
    D: Parser<Input = Input>,
    E: Parser<Input = Input>,
    F: Parser<Input = Input>,
    G: Parser<Input = Input>, 
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impl<Input: Stream, A, B, C, D, E, F, G, H> Parser for (A, B, C, D, E, F, G, H) where
    Input: Stream,
    Input::Error: ParseError<Input::Item, Input::Range, Input::Position>,
    A: Parser<Input = Input>,
    B: Parser<Input = Input>,
    C: Parser<Input = Input>,
    D: Parser<Input = Input>,
    E: Parser<Input = Input>,
    F: Parser<Input = Input>,
    G: Parser<Input = Input>,
    H: Parser<Input = Input>, 
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impl<Input: Stream, A, B, C, D, E, F, G, H, I> Parser for (A, B, C, D, E, F, G, H, I) where
    Input: Stream,
    Input::Error: ParseError<Input::Item, Input::Range, Input::Position>,
    A: Parser<Input = Input>,
    B: Parser<Input = Input>,
    C: Parser<Input = Input>,
    D: Parser<Input = Input>,
    E: Parser<Input = Input>,
    F: Parser<Input = Input>,
    G: Parser<Input = Input>,
    H: Parser<Input = Input>,
    I: Parser<Input = Input>, 
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impl<Input: Stream, A, B, C, D, E, F, G, H, I, J> Parser for (A, B, C, D, E, F, G, H, I, J) where
    Input: Stream,
    Input::Error: ParseError<Input::Item, Input::Range, Input::Position>,
    A: Parser<Input = Input>,
    B: Parser<Input = Input>,
    C: Parser<Input = Input>,
    D: Parser<Input = Input>,
    E: Parser<Input = Input>,
    F: Parser<Input = Input>,
    G: Parser<Input = Input>,
    H: Parser<Input = Input>,
    I: Parser<Input = Input>,
    J: Parser<Input = Input>, 
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impl<Input: Stream, A, B, C, D, E, F, G, H, I, J, K> Parser for (A, B, C, D, E, F, G, H, I, J, K) where
    Input: Stream,
    Input::Error: ParseError<Input::Item, Input::Range, Input::Position>,
    A: Parser<Input = Input>,
    B: Parser<Input = Input>,
    C: Parser<Input = Input>,
    D: Parser<Input = Input>,
    E: Parser<Input = Input>,
    F: Parser<Input = Input>,
    G: Parser<Input = Input>,
    H: Parser<Input = Input>,
    I: Parser<Input = Input>,
    J: Parser<Input = Input>,
    K: Parser<Input = Input>, 
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impl<Input: Stream, A, B, C, D, E, F, G, H, I, J, K, L> Parser for (A, B, C, D, E, F, G, H, I, J, K, L) where
    Input: Stream,
    Input::Error: ParseError<Input::Item, Input::Range, Input::Position>,
    A: Parser<Input = Input>,
    B: Parser<Input = Input>,
    C: Parser<Input = Input>,
    D: Parser<Input = Input>,
    E: Parser<Input = Input>,
    F: Parser<Input = Input>,
    G: Parser<Input = Input>,
    H: Parser<Input = Input>,
    I: Parser<Input = Input>,
    J: Parser<Input = Input>,
    K: Parser<Input = Input>,
    L: Parser<Input = Input>, 
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impl<'a, I, O, P: ?Sized> Parser for &'a mut P where
    I: Stream,
    P: Parser<Input = I, Output = O>, 
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impl<P: ?Sized> Parser for Box<P> where
    P: Parser
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Implementors