Enum std::path::Prefix

1.0.0 · source ·
pub enum Prefix<'a> {
    Verbatim(&'a OsStr),
    VerbatimUNC(&'a OsStr, &'a OsStr),
    VerbatimDisk(u8),
    DeviceNS(&'a OsStr),
    UNC(&'a OsStr, &'a OsStr),
    Disk(u8),
}
Expand description

Windows path prefixes, e.g., C: or \\server\share.

Windows uses a variety of path prefix styles, including references to drive volumes (like C:), network shared folders (like \\server\share), and others. In addition, some path prefixes are “verbatim” (i.e., prefixed with \\?\), in which case / is not treated as a separator and essentially no normalization is performed.

§Examples

use std::path::{Component, Path, Prefix};
use std::path::Prefix::*;
use std::ffi::OsStr;

fn get_path_prefix(s: &str) -> Prefix<'_> {
    let path = Path::new(s);
    match path.components().next().unwrap() {
        Component::Prefix(prefix_component) => prefix_component.kind(),
        _ => panic!(),
    }
}

assert_eq!(Verbatim(OsStr::new("pictures")),
           get_path_prefix(r"\\?\pictures\kittens"));
assert_eq!(VerbatimUNC(OsStr::new("server"), OsStr::new("share")),
           get_path_prefix(r"\\?\UNC\server\share"));
assert_eq!(VerbatimDisk(b'C'), get_path_prefix(r"\\?\c:\"));
assert_eq!(DeviceNS(OsStr::new("BrainInterface")),
           get_path_prefix(r"\\.\BrainInterface"));
assert_eq!(UNC(OsStr::new("server"), OsStr::new("share")),
           get_path_prefix(r"\\server\share"));
assert_eq!(Disk(b'C'), get_path_prefix(r"C:\Users\Rust\Pictures\Ferris"));
Run

Variants§

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Verbatim(&'a OsStr)

Verbatim prefix, e.g., \\?\cat_pics.

Verbatim prefixes consist of \\?\ immediately followed by the given component.

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VerbatimUNC(&'a OsStr, &'a OsStr)

Verbatim prefix using Windows’ Uniform Naming Convention, e.g., \\?\UNC\server\share.

Verbatim UNC prefixes consist of \\?\UNC\ immediately followed by the server’s hostname and a share name.

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VerbatimDisk(u8)

Verbatim disk prefix, e.g., \\?\C:.

Verbatim disk prefixes consist of \\?\ immediately followed by the drive letter and :.

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DeviceNS(&'a OsStr)

Device namespace prefix, e.g., \\.\COM42.

Device namespace prefixes consist of \\.\ (possibly using / instead of \), immediately followed by the device name.

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UNC(&'a OsStr, &'a OsStr)

Prefix using Windows’ Uniform Naming Convention, e.g. \\server\share.

UNC prefixes consist of the server’s hostname and a share name.

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Disk(u8)

Prefix C: for the given disk drive.

Implementations§

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impl<'a> Prefix<'a>

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pub fn is_verbatim(&self) -> bool

Determines if the prefix is verbatim, i.e., begins with \\?\.

§Examples
use std::path::Prefix::*;
use std::ffi::OsStr;

assert!(Verbatim(OsStr::new("pictures")).is_verbatim());
assert!(VerbatimUNC(OsStr::new("server"), OsStr::new("share")).is_verbatim());
assert!(VerbatimDisk(b'C').is_verbatim());
assert!(!DeviceNS(OsStr::new("BrainInterface")).is_verbatim());
assert!(!UNC(OsStr::new("server"), OsStr::new("share")).is_verbatim());
assert!(!Disk(b'C').is_verbatim());
Run

Trait Implementations§

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impl<'a> Clone for Prefix<'a>

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fn clone(&self) -> Prefix<'a>

Returns a copy 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<'a> Debug for Prefix<'a>

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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<'a> Hash for Prefix<'a>

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

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

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<'a> Ord for Prefix<'a>

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fn cmp(&self, other: &Prefix<'a>) -> Ordering

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

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

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

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

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

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

Restrict a value to a certain interval. Read more
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impl<'a> PartialEq for Prefix<'a>

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fn eq(&self, other: &Prefix<'a>) -> bool

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<'a> PartialOrd for Prefix<'a>

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fn partial_cmp(&self, other: &Prefix<'a>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<'a> Copy for Prefix<'a>

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impl<'a> Eq for Prefix<'a>

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impl<'a> StructuralPartialEq for Prefix<'a>

Auto Trait Implementations§

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impl<'a> RefUnwindSafe for Prefix<'a>

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impl<'a> Send for Prefix<'a>

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impl<'a> Sync for Prefix<'a>

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impl<'a> Unpin for Prefix<'a>

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impl<'a> UnwindSafe for Prefix<'a>

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> 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.