Enum tracing_core::stdlib::path::Prefix

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

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"));

Variants

Verbatim(&'a OsStr)

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

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

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.

VerbatimDisk(u8)

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

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

DeviceNS(&'a OsStr)

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

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

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.

Disk(u8)

Prefix C: for the given disk drive.

Implementations

impl<'a> Prefix<'a>

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());

Trait Implementations

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

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Prefix<'a>

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

Formats the value using the given formatter.

impl<'a> Hash for Prefix<'a>

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

where __H: Hasher,

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a> Ord for Prefix<'a>

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

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

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

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl<'a> PartialEq for Prefix<'a>

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

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

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> PartialOrd for Prefix<'a>

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

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'a> Copy for Prefix<'a>

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

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