FormatSpec in rustc_parse_format - Rust
Description: Specification for the formatting of an argument in the format string.

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## FormatSpec

# Struct FormatSpec

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    pub struct FormatSpec<'input> {Show 13 fields
        pub fill: Option<char>,
        pub fill_span: Option<Range<usize>>,
        pub align: Alignment,
        pub sign: Option<Sign>,
        pub alternate: bool,
        pub zero_pad: bool,
        pub debug_hex: Option<DebugHex>,
        pub precision: Count<'input>,
        pub precision_span: Option<Range<usize>>,
        pub width: Count<'input>,
        pub width_span: Option<Range<usize>>,
        pub ty: &'input str,
        pub ty_span: Option<Range<usize>>,
    }

Expand description

Specification for the formatting of an argument in the format string.

## Fields§

§`fill: Option<char>`

Optionally specified character to fill alignment with.

§`fill_span: Option<Range<usize>>`

Span of the optionally specified fill character.

§`align: Alignment`

Optionally specified alignment.

§`sign: Option<Sign>`

The `+` or `-` flag.

§`alternate: bool`

The `#` flag.

§`zero_pad: bool`

The `0` flag.

§`debug_hex: Option<DebugHex>`

The `x` or `X` flag. (Only for `Debug`.)

§`precision: Count<'input>`

The integer precision to use.

§`precision_span: Option<Range<usize>>`

The span of the precision formatting flag (for diagnostics).

§`width: Count<'input>`

The string width requested for the resulting format.

§`width_span: Option<Range<usize>>`

The span of the width formatting flag (for diagnostics).

§`ty: &'input str`

The descriptor string representing the name of the format desired for this argument, this can be empty or any number of characters, although it is required to be one word.

§`ty_span: Option<Range<usize>>`

The span of the descriptor string (for diagnostics).

## Trait Implementations§

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### impl<'input> Clone for FormatSpec<'input>

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#### fn clone(&self) -> FormatSpec<'input>

Returns a duplicate of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl<'input> Debug for FormatSpec<'input>

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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### impl<'input> Default for FormatSpec<'input>

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#### fn default() -> FormatSpec<'input>

Returns the “default value” for a type. Read more
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### impl<'input> PartialEq for FormatSpec<'input>

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#### fn eq(&self, other: &FormatSpec<'input>) -> bool

Tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

Tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl<'input> StructuralPartialEq for FormatSpec<'input>

## Auto Trait Implementations§

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### impl<'input> Freeze for FormatSpec<'input>

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### impl<'input> RefUnwindSafe for FormatSpec<'input>

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### impl<'input> Send for FormatSpec<'input>

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### impl<'input> Sync for FormatSpec<'input>

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### impl<'input> Unpin for FormatSpec<'input>

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### impl<'input> UnsafeUnpin for FormatSpec<'input>

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### impl<'input> UnwindSafe for FormatSpec<'input>

## Blanket Implementations§

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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> CloneToUninit for T
where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 208 bytes