574 lines
18 KiB
Rust
574 lines
18 KiB
Rust
// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Operations on ASCII strings and characters.
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#![stable(feature = "rust1", since = "1.0.0")]
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use mem;
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use ops::Range;
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use iter::FusedIterator;
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/// Extension methods for ASCII-subset only operations on string slices.
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///
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/// Be aware that operations on seemingly non-ASCII characters can sometimes
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/// have unexpected results. Consider this example:
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///
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/// ```
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/// use std::ascii::AsciiExt;
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///
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/// assert_eq!("café".to_ascii_uppercase(), "CAFÉ");
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/// assert_eq!("café".to_ascii_uppercase(), "CAFé");
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/// ```
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///
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/// In the first example, the lowercased string is represented `"cafe\u{301}"`
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/// (the last character is an acute accent [combining character]). Unlike the
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/// other characters in the string, the combining character will not get mapped
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/// to an uppercase variant, resulting in `"CAFE\u{301}"`. In the second
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/// example, the lowercased string is represented `"caf\u{e9}"` (the last
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/// character is a single Unicode character representing an 'e' with an acute
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/// accent). Since the last character is defined outside the scope of ASCII,
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/// it will not get mapped to an uppercase variant, resulting in `"CAF\u{e9}"`.
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///
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/// [combining character]: https://en.wikipedia.org/wiki/Combining_character
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#[stable(feature = "rust1", since = "1.0.0")]
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pub trait AsciiExt {
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/// Container type for copied ASCII characters.
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#[stable(feature = "rust1", since = "1.0.0")]
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type Owned;
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/// Checks if the value is within the ASCII range.
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///
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/// # Examples
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///
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/// ```
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/// use std::ascii::AsciiExt;
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///
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/// let ascii = 'a';
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/// let utf8 = '❤';
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///
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/// assert!(ascii.is_ascii());
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/// assert!(!utf8.is_ascii());
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn is_ascii(&self) -> bool;
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/// Makes a copy of the string in ASCII upper case.
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///
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/// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',
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/// but non-ASCII letters are unchanged.
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///
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/// # Examples
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///
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/// ```
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/// use std::ascii::AsciiExt;
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///
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/// let ascii = 'a';
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/// let utf8 = '❤';
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///
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/// assert_eq!('A', ascii.to_ascii_uppercase());
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/// assert_eq!('❤', utf8.to_ascii_uppercase());
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn to_ascii_uppercase(&self) -> Self::Owned;
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/// Makes a copy of the string in ASCII lower case.
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///
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/// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',
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/// but non-ASCII letters are unchanged.
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///
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/// # Examples
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///
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/// ```
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/// use std::ascii::AsciiExt;
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///
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/// let ascii = 'A';
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/// let utf8 = '❤';
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///
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/// assert_eq!('a', ascii.to_ascii_lowercase());
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/// assert_eq!('❤', utf8.to_ascii_lowercase());
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn to_ascii_lowercase(&self) -> Self::Owned;
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/// Checks that two strings are an ASCII case-insensitive match.
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///
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/// Same as `to_ascii_lowercase(a) == to_ascii_lowercase(b)`,
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/// but without allocating and copying temporary strings.
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///
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/// # Examples
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///
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/// ```
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/// use std::ascii::AsciiExt;
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///
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/// let ascii1 = 'A';
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/// let ascii2 = 'a';
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/// let ascii3 = 'A';
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/// let ascii4 = 'z';
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///
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/// assert!(ascii1.eq_ignore_ascii_case(&ascii2));
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/// assert!(ascii1.eq_ignore_ascii_case(&ascii3));
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/// assert!(!ascii1.eq_ignore_ascii_case(&ascii4));
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn eq_ignore_ascii_case(&self, other: &Self) -> bool;
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/// Converts this type to its ASCII upper case equivalent in-place.
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///
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/// See `to_ascii_uppercase` for more information.
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///
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/// # Examples
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///
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/// ```
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/// use std::ascii::AsciiExt;
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///
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/// let mut ascii = 'a';
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///
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/// ascii.make_ascii_uppercase();
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///
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/// assert_eq!('A', ascii);
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/// ```
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#[stable(feature = "ascii", since = "1.9.0")]
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fn make_ascii_uppercase(&mut self);
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/// Converts this type to its ASCII lower case equivalent in-place.
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///
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/// See `to_ascii_lowercase` for more information.
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///
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/// # Examples
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///
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/// ```
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/// use std::ascii::AsciiExt;
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///
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/// let mut ascii = 'A';
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///
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/// ascii.make_ascii_lowercase();
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///
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/// assert_eq!('a', ascii);
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/// ```
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#[stable(feature = "ascii", since = "1.9.0")]
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fn make_ascii_lowercase(&mut self);
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}
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#[stable(feature = "rust1", since = "1.0.0")]
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impl AsciiExt for str {
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type Owned = String;
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#[inline]
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fn is_ascii(&self) -> bool {
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self.bytes().all(|b| b.is_ascii())
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}
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#[inline]
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fn to_ascii_uppercase(&self) -> String {
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let mut bytes = self.as_bytes().to_vec();
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bytes.make_ascii_uppercase();
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// make_ascii_uppercase() preserves the UTF-8 invariant.
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unsafe { String::from_utf8_unchecked(bytes) }
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}
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#[inline]
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fn to_ascii_lowercase(&self) -> String {
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let mut bytes = self.as_bytes().to_vec();
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bytes.make_ascii_lowercase();
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// make_ascii_uppercase() preserves the UTF-8 invariant.
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unsafe { String::from_utf8_unchecked(bytes) }
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}
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#[inline]
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fn eq_ignore_ascii_case(&self, other: &str) -> bool {
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self.as_bytes().eq_ignore_ascii_case(other.as_bytes())
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}
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fn make_ascii_uppercase(&mut self) {
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let me: &mut [u8] = unsafe { mem::transmute(self) };
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me.make_ascii_uppercase()
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}
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fn make_ascii_lowercase(&mut self) {
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let me: &mut [u8] = unsafe { mem::transmute(self) };
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me.make_ascii_lowercase()
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}
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}
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#[stable(feature = "rust1", since = "1.0.0")]
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impl AsciiExt for [u8] {
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type Owned = Vec<u8>;
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#[inline]
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fn is_ascii(&self) -> bool {
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self.iter().all(|b| b.is_ascii())
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}
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#[inline]
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fn to_ascii_uppercase(&self) -> Vec<u8> {
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let mut me = self.to_vec();
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me.make_ascii_uppercase();
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return me
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}
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#[inline]
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fn to_ascii_lowercase(&self) -> Vec<u8> {
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let mut me = self.to_vec();
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me.make_ascii_lowercase();
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return me
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}
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#[inline]
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fn eq_ignore_ascii_case(&self, other: &[u8]) -> bool {
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self.len() == other.len() &&
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self.iter().zip(other).all(|(a, b)| {
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a.eq_ignore_ascii_case(b)
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})
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}
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fn make_ascii_uppercase(&mut self) {
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for byte in self {
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byte.make_ascii_uppercase();
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}
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}
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fn make_ascii_lowercase(&mut self) {
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for byte in self {
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byte.make_ascii_lowercase();
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}
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}
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}
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#[stable(feature = "rust1", since = "1.0.0")]
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impl AsciiExt for u8 {
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type Owned = u8;
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#[inline]
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fn is_ascii(&self) -> bool { *self & 128 == 0 }
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#[inline]
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fn to_ascii_uppercase(&self) -> u8 { ASCII_UPPERCASE_MAP[*self as usize] }
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#[inline]
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fn to_ascii_lowercase(&self) -> u8 { ASCII_LOWERCASE_MAP[*self as usize] }
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#[inline]
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fn eq_ignore_ascii_case(&self, other: &u8) -> bool {
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self.to_ascii_lowercase() == other.to_ascii_lowercase()
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}
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#[inline]
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fn make_ascii_uppercase(&mut self) { *self = self.to_ascii_uppercase(); }
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#[inline]
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fn make_ascii_lowercase(&mut self) { *self = self.to_ascii_lowercase(); }
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}
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#[stable(feature = "rust1", since = "1.0.0")]
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impl AsciiExt for char {
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type Owned = char;
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#[inline]
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fn is_ascii(&self) -> bool {
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*self as u32 <= 0x7F
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}
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#[inline]
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fn to_ascii_uppercase(&self) -> char {
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if self.is_ascii() {
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(*self as u8).to_ascii_uppercase() as char
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} else {
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*self
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}
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}
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#[inline]
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fn to_ascii_lowercase(&self) -> char {
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if self.is_ascii() {
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(*self as u8).to_ascii_lowercase() as char
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} else {
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*self
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}
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}
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#[inline]
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fn eq_ignore_ascii_case(&self, other: &char) -> bool {
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self.to_ascii_lowercase() == other.to_ascii_lowercase()
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}
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#[inline]
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fn make_ascii_uppercase(&mut self) { *self = self.to_ascii_uppercase(); }
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#[inline]
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fn make_ascii_lowercase(&mut self) { *self = self.to_ascii_lowercase(); }
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}
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/// An iterator over the escaped version of a byte, constructed via
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/// `std::ascii::escape_default`.
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#[stable(feature = "rust1", since = "1.0.0")]
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pub struct EscapeDefault {
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range: Range<usize>,
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data: [u8; 4],
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}
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/// Returns an iterator that produces an escaped version of a `u8`.
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///
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/// The default is chosen with a bias toward producing literals that are
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/// legal in a variety of languages, including C++11 and similar C-family
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/// languages. The exact rules are:
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///
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/// - Tab, CR and LF are escaped as '\t', '\r' and '\n' respectively.
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/// - Single-quote, double-quote and backslash chars are backslash-escaped.
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/// - Any other chars in the range [0x20,0x7e] are not escaped.
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/// - Any other chars are given hex escapes of the form '\xNN'.
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/// - Unicode escapes are never generated by this function.
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///
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/// # Examples
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///
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/// ```
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/// use std::ascii;
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///
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/// let escaped = ascii::escape_default(b'0').next().unwrap();
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/// assert_eq!(b'0', escaped);
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///
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/// let mut escaped = ascii::escape_default(b'\t');
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///
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/// assert_eq!(b'\\', escaped.next().unwrap());
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/// assert_eq!(b't', escaped.next().unwrap());
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn escape_default(c: u8) -> EscapeDefault {
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let (data, len) = match c {
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b'\t' => ([b'\\', b't', 0, 0], 2),
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b'\r' => ([b'\\', b'r', 0, 0], 2),
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b'\n' => ([b'\\', b'n', 0, 0], 2),
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b'\\' => ([b'\\', b'\\', 0, 0], 2),
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b'\'' => ([b'\\', b'\'', 0, 0], 2),
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b'"' => ([b'\\', b'"', 0, 0], 2),
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b'\x20' ... b'\x7e' => ([c, 0, 0, 0], 1),
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_ => ([b'\\', b'x', hexify(c >> 4), hexify(c & 0xf)], 4),
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};
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return EscapeDefault { range: (0.. len), data: data };
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fn hexify(b: u8) -> u8 {
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match b {
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0 ... 9 => b'0' + b,
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_ => b'a' + b - 10,
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}
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}
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}
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#[stable(feature = "rust1", since = "1.0.0")]
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impl Iterator for EscapeDefault {
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type Item = u8;
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fn next(&mut self) -> Option<u8> { self.range.next().map(|i| self.data[i]) }
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fn size_hint(&self) -> (usize, Option<usize>) { self.range.size_hint() }
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}
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#[stable(feature = "rust1", since = "1.0.0")]
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impl DoubleEndedIterator for EscapeDefault {
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fn next_back(&mut self) -> Option<u8> {
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self.range.next_back().map(|i| self.data[i])
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}
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}
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#[stable(feature = "rust1", since = "1.0.0")]
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impl ExactSizeIterator for EscapeDefault {}
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#[unstable(feature = "fused", issue = "35602")]
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impl FusedIterator for EscapeDefault {}
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static ASCII_LOWERCASE_MAP: [u8; 256] = [
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
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b' ', b'!', b'"', b'#', b'$', b'%', b'&', b'\'',
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b'(', b')', b'*', b'+', b',', b'-', b'.', b'/',
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b'0', b'1', b'2', b'3', b'4', b'5', b'6', b'7',
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b'8', b'9', b':', b';', b'<', b'=', b'>', b'?',
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b'@',
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b'a', b'b', b'c', b'd', b'e', b'f', b'g',
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b'h', b'i', b'j', b'k', b'l', b'm', b'n', b'o',
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b'p', b'q', b'r', b's', b't', b'u', b'v', b'w',
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b'x', b'y', b'z',
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b'[', b'\\', b']', b'^', b'_',
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b'`', b'a', b'b', b'c', b'd', b'e', b'f', b'g',
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b'h', b'i', b'j', b'k', b'l', b'm', b'n', b'o',
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b'p', b'q', b'r', b's', b't', b'u', b'v', b'w',
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b'x', b'y', b'z', b'{', b'|', b'}', b'~', 0x7f,
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0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
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0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
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0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
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0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
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0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
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0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
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0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
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0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
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0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
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0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
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0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
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0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
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0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
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0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
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0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
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];
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static ASCII_UPPERCASE_MAP: [u8; 256] = [
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
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b' ', b'!', b'"', b'#', b'$', b'%', b'&', b'\'',
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b'(', b')', b'*', b'+', b',', b'-', b'.', b'/',
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b'0', b'1', b'2', b'3', b'4', b'5', b'6', b'7',
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b'8', b'9', b':', b';', b'<', b'=', b'>', b'?',
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b'@', b'A', b'B', b'C', b'D', b'E', b'F', b'G',
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b'H', b'I', b'J', b'K', b'L', b'M', b'N', b'O',
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b'P', b'Q', b'R', b'S', b'T', b'U', b'V', b'W',
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b'X', b'Y', b'Z', b'[', b'\\', b']', b'^', b'_',
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b'`',
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b'A', b'B', b'C', b'D', b'E', b'F', b'G',
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b'H', b'I', b'J', b'K', b'L', b'M', b'N', b'O',
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b'P', b'Q', b'R', b'S', b'T', b'U', b'V', b'W',
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b'X', b'Y', b'Z',
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b'{', b'|', b'}', b'~', 0x7f,
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0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
|
||
0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
|
||
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
|
||
0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
|
||
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
|
||
0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
|
||
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
|
||
0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
|
||
0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
|
||
0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
|
||
0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
|
||
0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
|
||
0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
|
||
0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
|
||
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
|
||
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
|
||
];
|
||
|
||
|
||
#[cfg(test)]
|
||
mod tests {
|
||
use super::*;
|
||
use char::from_u32;
|
||
|
||
#[test]
|
||
fn test_is_ascii() {
|
||
assert!(b"".is_ascii());
|
||
assert!(b"banana\0\x7F".is_ascii());
|
||
assert!(b"banana\0\x7F".iter().all(|b| b.is_ascii()));
|
||
assert!(!b"Vi\xe1\xbb\x87t Nam".is_ascii());
|
||
assert!(!b"Vi\xe1\xbb\x87t Nam".iter().all(|b| b.is_ascii()));
|
||
assert!(!b"\xe1\xbb\x87".iter().any(|b| b.is_ascii()));
|
||
|
||
assert!("".is_ascii());
|
||
assert!("banana\0\u{7F}".is_ascii());
|
||
assert!("banana\0\u{7F}".chars().all(|c| c.is_ascii()));
|
||
assert!(!"ประเทศไทย中华Việt Nam".chars().all(|c| c.is_ascii()));
|
||
assert!(!"ประเทศไทย中华ệ ".chars().any(|c| c.is_ascii()));
|
||
}
|
||
|
||
#[test]
|
||
fn test_to_ascii_uppercase() {
|
||
assert_eq!("url()URL()uRl()ürl".to_ascii_uppercase(), "URL()URL()URL()üRL");
|
||
assert_eq!("hıKß".to_ascii_uppercase(), "HıKß");
|
||
|
||
for i in 0..501 {
|
||
let upper = if 'a' as u32 <= i && i <= 'z' as u32 { i + 'A' as u32 - 'a' as u32 }
|
||
else { i };
|
||
assert_eq!((from_u32(i).unwrap()).to_string().to_ascii_uppercase(),
|
||
(from_u32(upper).unwrap()).to_string());
|
||
}
|
||
}
|
||
|
||
#[test]
|
||
fn test_to_ascii_lowercase() {
|
||
assert_eq!("url()URL()uRl()Ürl".to_ascii_lowercase(), "url()url()url()Ürl");
|
||
// Dotted capital I, Kelvin sign, Sharp S.
|
||
assert_eq!("HİKß".to_ascii_lowercase(), "hİKß");
|
||
|
||
for i in 0..501 {
|
||
let lower = if 'A' as u32 <= i && i <= 'Z' as u32 { i + 'a' as u32 - 'A' as u32 }
|
||
else { i };
|
||
assert_eq!((from_u32(i).unwrap()).to_string().to_ascii_lowercase(),
|
||
(from_u32(lower).unwrap()).to_string());
|
||
}
|
||
}
|
||
|
||
#[test]
|
||
fn test_make_ascii_lower_case() {
|
||
macro_rules! test {
|
||
($from: expr, $to: expr) => {
|
||
{
|
||
let mut x = $from;
|
||
x.make_ascii_lowercase();
|
||
assert_eq!(x, $to);
|
||
}
|
||
}
|
||
}
|
||
test!(b'A', b'a');
|
||
test!(b'a', b'a');
|
||
test!(b'!', b'!');
|
||
test!('A', 'a');
|
||
test!('À', 'À');
|
||
test!('a', 'a');
|
||
test!('!', '!');
|
||
test!(b"H\xc3\x89".to_vec(), b"h\xc3\x89");
|
||
test!("HİKß".to_string(), "hİKß");
|
||
}
|
||
|
||
|
||
#[test]
|
||
fn test_make_ascii_upper_case() {
|
||
macro_rules! test {
|
||
($from: expr, $to: expr) => {
|
||
{
|
||
let mut x = $from;
|
||
x.make_ascii_uppercase();
|
||
assert_eq!(x, $to);
|
||
}
|
||
}
|
||
}
|
||
test!(b'a', b'A');
|
||
test!(b'A', b'A');
|
||
test!(b'!', b'!');
|
||
test!('a', 'A');
|
||
test!('à', 'à');
|
||
test!('A', 'A');
|
||
test!('!', '!');
|
||
test!(b"h\xc3\xa9".to_vec(), b"H\xc3\xa9");
|
||
test!("hıKß".to_string(), "HıKß");
|
||
|
||
let mut x = "Hello".to_string();
|
||
x[..3].make_ascii_uppercase(); // Test IndexMut on String.
|
||
assert_eq!(x, "HELlo")
|
||
}
|
||
|
||
#[test]
|
||
fn test_eq_ignore_ascii_case() {
|
||
assert!("url()URL()uRl()Ürl".eq_ignore_ascii_case("url()url()url()Ürl"));
|
||
assert!(!"Ürl".eq_ignore_ascii_case("ürl"));
|
||
// Dotted capital I, Kelvin sign, Sharp S.
|
||
assert!("HİKß".eq_ignore_ascii_case("hİKß"));
|
||
assert!(!"İ".eq_ignore_ascii_case("i"));
|
||
assert!(!"K".eq_ignore_ascii_case("k"));
|
||
assert!(!"ß".eq_ignore_ascii_case("s"));
|
||
|
||
for i in 0..501 {
|
||
let lower = if 'A' as u32 <= i && i <= 'Z' as u32 { i + 'a' as u32 - 'A' as u32 }
|
||
else { i };
|
||
assert!((from_u32(i).unwrap()).to_string().eq_ignore_ascii_case(
|
||
&from_u32(lower).unwrap().to_string()));
|
||
}
|
||
}
|
||
|
||
#[test]
|
||
fn inference_works() {
|
||
let x = "a".to_string();
|
||
x.eq_ignore_ascii_case("A");
|
||
}
|
||
}
|