[][src]Struct fmt_macros::Parser

pub struct Parser<'a> {
    input: &'a str,
    cur: Peekable<CharIndices<'a>>,
    pub errors: Vec<ParseError>,
    curarg: usize,
    style: Option<usize>,
    seen_newlines: usize,
    pub arg_places: Vec<(usize, usize)>,
}
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The parser structure for interpreting the input format string. This is modeled as an iterator over Piece structures to form a stream of tokens being output.

This is a recursive-descent parser for the sake of simplicity, and if necessary there's probably lots of room for improvement performance-wise.

Fields

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

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

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Error messages accumulated during parsing

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Current position of implicit positional argument pointer

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Some(raw count) when the string is "raw", used to position spans correctly

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How many newlines have been seen in the string so far, to adjust the error spans

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Start and end byte offset of every successfully parsed argument

Methods

impl<'a> Parser<'a>
[src]

Important traits for Parser<'a>

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

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Creates a new parser for the given format string

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Notifies of an error. The message doesn't actually need to be of type String, but I think it does when this eventually uses conditions so it might as well start using it now.

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Notifies of an error. The message doesn't actually need to be of type String, but I think it does when this eventually uses conditions so it might as well start using it now.

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Optionally consumes the specified character. If the character is not at the current position, then the current iterator isn't moved and false is returned, otherwise the character is consumed and true is returned.

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Forces consumption of the specified character. If the character is not found, an error is emitted.

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Consumes all whitespace characters until the first non-whitespace character

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Parses all of a string which is to be considered a "raw literal" in a format string. This is everything outside of the braces.

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Parses an Argument structure, or what's contained within braces inside the format string

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Parses a positional argument for a format. This could either be an integer index of an argument, a named argument, or a blank string. Returns Some(parsed_position) if the position is not implicitly consuming a macro argument, None if it's the case.

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Parses a format specifier at the current position, returning all of the relevant information in the FormatSpec struct.

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Parses a Count parameter at the current position. This does not check for 'CountIsNextParam' because that is only used in precision, not width.

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Parses a word starting at the current position. A word is considered to be an alphabetic character followed by any number of alphanumeric characters.

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Optionally parses an integer at the current position. This doesn't deal with overflow at all, it's just accumulating digits.

Trait Implementations

impl<'a> Iterator for Parser<'a>
[src]

The type of the elements being iterated over.

Advances the iterator and returns the next value. Read more

Returns the bounds on the remaining length of the iterator. Read more

Consumes the iterator, counting the number of iterations and returning it. Read more

Consumes the iterator, returning the last element. Read more

Returns the nth element of the iterator. Read more

Creates an iterator starting at the same point, but stepping by the given amount at each iteration. Read more

Takes two iterators and creates a new iterator over both in sequence. Read more

'Zips up' two iterators into a single iterator of pairs. Read more

Takes a closure and creates an iterator which calls that closure on each element. Read more

Calls a closure on each element of an iterator. Read more

Creates an iterator which uses a closure to determine if an element should be yielded. Read more

Creates an iterator that both filters and maps. Read more

Creates an iterator which gives the current iteration count as well as the next value. Read more

Creates an iterator which can use peek to look at the next element of the iterator without consuming it. Read more

Creates an iterator that [skip]s elements based on a predicate. Read more

Creates an iterator that yields elements based on a predicate. Read more

Creates an iterator that skips the first n elements. Read more

Creates an iterator that yields its first n elements. Read more

An iterator adaptor similar to [fold] that holds internal state and produces a new iterator. Read more

Creates an iterator that works like map, but flattens nested structure. Read more

Creates an iterator that flattens nested structure. Read more

Creates an iterator which ends after the first [None]. Read more

Do something with each element of an iterator, passing the value on. Read more

Borrows an iterator, rather than consuming it. Read more

Transforms an iterator into a collection. Read more

Consumes an iterator, creating two collections from it. Read more

An iterator method that applies a function as long as it returns successfully, producing a single, final value. Read more

An iterator method that applies a fallible function to each item in the iterator, stopping at the first error and returning that error. Read more

An iterator method that applies a function, producing a single, final value. Read more

Tests if every element of the iterator matches a predicate. Read more

Tests if any element of the iterator matches a predicate. Read more

Searches for an element of an iterator that satisfies a predicate. Read more

Applies function to the elements of iterator and returns the first non-none result. Read more

Searches for an element in an iterator, returning its index. Read more

Searches for an element in an iterator from the right, returning its index. Read more

Returns the maximum element of an iterator. Read more

Returns the minimum element of an iterator. Read more

Returns the element that gives the maximum value from the specified function. Read more

Returns the element that gives the maximum value with respect to the specified comparison function. Read more

Returns the element that gives the minimum value from the specified function. Read more

Returns the element that gives the minimum value with respect to the specified comparison function. Read more

Reverses an iterator's direction. Read more

Converts an iterator of pairs into a pair of containers. Read more

Creates an iterator which [clone]s all of its elements. Read more

Repeats an iterator endlessly. Read more

Sums the elements of an iterator. Read more

Iterates over the entire iterator, multiplying all the elements Read more

Lexicographically compares the elements of this Iterator with those of another. Read more

Lexicographically compares the elements of this Iterator with those of another. Read more

Determines if the elements of this Iterator are equal to those of another. Read more

Determines if the elements of this Iterator are unequal to those of another. Read more

Determines if the elements of this Iterator are lexicographically less than those of another. Read more

Determines if the elements of this Iterator are lexicographically less or equal to those of another. Read more

Determines if the elements of this Iterator are lexicographically greater than those of another. Read more

Determines if the elements of this Iterator are lexicographically greater than or equal to those of another. Read more

Auto Trait Implementations

impl<'a> Send for Parser<'a>

impl<'a> Sync for Parser<'a>

Blanket Implementations

impl<T> From for T
[src]

Performs the conversion.

impl<I> IntoIterator for I where
    I: Iterator
[src]

The type of the elements being iterated over.

Which kind of iterator are we turning this into?

Creates an iterator from a value. Read more

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

Performs the conversion.

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

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

The type returned in the event of a conversion error.

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

Performs the conversion.

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

Immutably borrows from an owned value. Read more

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

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

The type returned in the event of a conversion error.

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

Performs the conversion.

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

Mutably borrows from an owned value. Read more

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

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

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more