Trait AsciiExt

trait AsciiExt

Extension methods for ASCII-subset only operations.

Be aware that operations on seemingly non-ASCII characters can sometimes have unexpected results. Consider this example:

use std::ascii::AsciiExt;

assert_eq!(AsciiExt::to_ascii_uppercase("café"), "CAFÉ");
assert_eq!(AsciiExt::to_ascii_uppercase("café"), "CAFé");

In the first example, the lowercased string is represented "cafe\u{301}" (the last character is an acute accent combining character). Unlike the other characters in the string, the combining character will not get mapped to an uppercase variant, resulting in "CAFE\u{301}". In the second example, the lowercased string is represented "caf\u{e9}" (the last character is a single Unicode character representing an 'e' with an acute accent). Since the last character is defined outside the scope of ASCII, it will not get mapped to an uppercase variant, resulting in "CAF\u{e9}".

Associated Types

type Owned

Container type for copied ASCII characters.

Required Methods

fn is_ascii(self: &Self) -> bool

Checks if the value is within the ASCII range.

Note

This method is deprecated in favor of the identically-named inherent methods on u8, char, [u8] and str.

fn to_ascii_uppercase(self: &Self) -> <Self as >::Owned

Makes a copy of the value in its ASCII upper case equivalent.

ASCII letters 'a' to 'z' are mapped to 'A' to 'Z', but non-ASCII letters are unchanged.

To uppercase the value in-place, use make_ascii_uppercase.

To uppercase ASCII characters in addition to non-ASCII characters, use str::to_uppercase.

Note

This method is deprecated in favor of the identically-named inherent methods on u8, char, [u8] and str.

fn to_ascii_lowercase(self: &Self) -> <Self as >::Owned

Makes a copy of the value in its ASCII lower case equivalent.

ASCII letters 'A' to 'Z' are mapped to 'a' to 'z', but non-ASCII letters are unchanged.

To lowercase the value in-place, use make_ascii_lowercase.

To lowercase ASCII characters in addition to non-ASCII characters, use str::to_lowercase.

Note

This method is deprecated in favor of the identically-named inherent methods on u8, char, [u8] and str.

fn eq_ignore_ascii_case(self: &Self, other: &Self) -> bool

Checks that two values are an ASCII case-insensitive match.

Same as to_ascii_lowercase(a) == to_ascii_lowercase(b), but without allocating and copying temporaries.

Note

This method is deprecated in favor of the identically-named inherent methods on u8, char, [u8] and str.

fn make_ascii_uppercase(self: &mut Self)

Converts this type to its ASCII upper case equivalent in-place.

ASCII letters 'a' to 'z' are mapped to 'A' to 'Z', but non-ASCII letters are unchanged.

To return a new uppercased value without modifying the existing one, use to_ascii_uppercase.

Note

This method is deprecated in favor of the identically-named inherent methods on u8, char, [u8] and str.

fn make_ascii_lowercase(self: &mut Self)

Converts this type to its ASCII lower case equivalent in-place.

ASCII letters 'A' to 'Z' are mapped to 'a' to 'z', but non-ASCII letters are unchanged.

To return a new lowercased value without modifying the existing one, use to_ascii_lowercase.

Note

This method is deprecated in favor of the identically-named inherent methods on u8, char, [u8] and str.

Implementors