## RealFileName

# Struct RealFileName

Source

    pub struct RealFileName {
        pub(crate) local: Option<InnerRealFileName>,
        pub(crate) maybe_remapped: InnerRealFileName,
        pub(crate) scopes: RemapPathScopeComponents,
    }

Expand description

A self-contained “real” filename.

It is produced by `SourceMap::to_real_filename`.

`RealFileName` represents a filename that may have been (partly) remapped by `--remap-path-prefix` and `-Zremap-path-scope`.

It also contains an embedabble component which gives a working directory and a maybe-remapped maybe-aboslote name. This is useful for debuginfo where some formats and tools highly prefer absolute paths.

### §Consistency across compiler sessions

The type-system, const-eval and other parts of the compiler rely on `FileName` and by extension `RealFileName` to be consistent across compiler sessions.

Otherwise unsoudness (like rust-lang/rust#148328) may occur.

As such this type is self-sufficient and consistent in it’s output.

The `RealFileName::path` and `RealFileName::embeddable_name` methods are guaranteed to always return the same output across compiler sessions.

### §Usage

Creation of a `RealFileName` should be done using `FilePathMapping::to_real_filename`.

Retrieving a path can be done in two main ways:

- by using `RealFileName::path` with a given scope (should be preferred)
- or by using `RealFileName::embeddable_name` with a given scope

## Fields§

§`local: Option<InnerRealFileName>`

The local name (always present in the original crate)

§`maybe_remapped: InnerRealFileName`

The maybe remapped part. Correspond to `local` when no remapped happened.

§`scopes: RemapPathScopeComponents`

The remapped scopes. Any active scope MUST use `maybe_virtual`

## Implementations§

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### impl RealFileName

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#### pub fn path(&self, scope: RemapPathScopeComponents) -> &Path

Returns the associated path for the given remapping scope.

###### §Panic

Only one scope components can be given to this function.

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#### pub fn embeddable_name(&self, scope: RemapPathScopeComponents) -> (&Path, &Path)

Returns the working directory and embeddable path for the given remapping scope.

Useful for embedding a mostly abosolute path (modulo remapping) in the compiler outputs.

The embedabble path is not guaranteed to be an absolute path, nor is it garuenteed that the working directory part is always a prefix of embeddable path.

###### §Panic

Only one scope components can be given to this function.

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#### pub fn local_path(&self) -> Option<&Path>

Returns the path suitable for reading from the file system on the local host, if this information exists.

May not exists if the filename was imported from another crate.

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#### pub fn into_local_path(self) -> Option<PathBuf>

Returns the path suitable for reading from the file system on the local host, if this information exists.

May not exists if the filename was imported from another crate.

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#### pub(crate) fn was_remapped(&self) -> bool

Returns whenever the filename was remapped.

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#### pub fn empty() -> RealFileName

Returns an empty `RealFileName`

Useful as the working directory input to `SourceMap::to_real_filename`.

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#### pub fn from_virtual_path(path: &Path) -> RealFileName

Returns a `RealFileName` that is completely remapped without any local components.

Only exposed for the purpose of `-Zsimulate-remapped-rust-src-base`.

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#### pub fn update_for_crate_metadata(&mut self)

Update the filename for encoding in the crate metadata.

Currently it’s about removing the local part when the filename is fully remapped.

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#### pub(crate) fn to_string_lossy<'a>( &'a self, display_pref: FileNameDisplayPreference, ) -> Cow<'a, str>

Internal routine to display the filename.

Users should always use the `RealFileName::path` method or `FileName` methods instead.

## Trait Implementations§

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### impl Clone for RealFileName

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#### fn clone(&self) -> RealFileName

Returns a duplicate of the value. Read more
1.0.0§

#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl Debug for RealFileName

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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<__D: SpanDecoder> Decodable<__D> for RealFileName

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#### fn decode(__decoder: &mut __D) -> Self

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### impl<__E: SpanEncoder> Encodable<__E> for RealFileName

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#### fn encode(&self, __encoder: &mut __E)

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### impl Hash for RealFileName

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#### fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given `Hasher`. Read more
1.3.0§

#### fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given `Hasher`. Read more
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### impl Ord for RealFileName

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#### fn cmp(&self, other: &RealFileName) -> Ordering

This method returns an `Ordering` between `self` and `other`. Read more
1.21.0§

#### fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
1.21.0§

#### fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
1.50.0§

#### fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more
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### impl PartialEq for RealFileName

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#### fn eq(&self, other: &RealFileName) -> bool

Tests for `self` and `other` values to be equal, and is used by `==`.
1.0.0§

#### 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 PartialOrd for RealFileName

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#### fn partial_cmp(&self, other: &RealFileName) -> Option<Ordering>

This method returns an ordering between `self` and `other` values if one exists. Read more
1.0.0§

#### fn lt(&self, other: &Rhs) -> bool

Tests less than (for `self` and `other`) and is used by the `<` operator. Read more
1.0.0§

#### fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more
1.0.0§

#### fn gt(&self, other: &Rhs) -> bool

Tests greater than (for `self` and `other`) and is used by the `>` operator. Read more
1.0.0§

#### fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more
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### impl Eq for RealFileName

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### impl StructuralPartialEq for RealFileName

## Auto Trait Implementations§

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### impl DynSend for RealFileName

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### impl DynSync for RealFileName

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### impl Freeze for RealFileName

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### impl RefUnwindSafe for RealFileName

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### impl Send for RealFileName

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### impl Sync for RealFileName

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### impl Unpin for RealFileName

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### impl UnwindSafe for RealFileName

## Blanket Implementations§

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#### const ALIGN: Alignment

Alignment of `Self`.
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Gets the `TypeId` of `self`. Read more
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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<Q, K> Comparable<K> for Q
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#### fn compare(&self, key: &K) -> Ordering

Compare self to `key` and return their ordering.
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Checks if this value is equivalent to the given key. Read more
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Checks if this value is equivalent to the given key. Read more
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#### fn equivalent(&self, key: &K) -> bool

Compare self to `key` and return `true` if they are equal.
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Returns the argument unchanged.

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#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
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Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
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Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left` is `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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#### type Output = T

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#### type Owned = T

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## 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: 152 bytes