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// 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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//! |
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//! Most string operations in Rust act on UTF-8 strings. However, at times it |
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//! makes more sense to only consider the ASCII character set for a specific |
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//! operation. |
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//! |
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//! The [`AsciiExt`] trait provides methods that allow for character |
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//! operations that only act on the ASCII subset and leave non-ASCII characters |
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//! alone. |
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//! |
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//! The [`escape_default`] function provides an iterator over the bytes of an |
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//! escaped version of the character given. |
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//! |
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//! [`AsciiExt`]: trait.AsciiExt.html |
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//! [`escape_default`]: fn.escape_default.html |
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#![stable(feature = "rust1", since = "1.0.0")] |
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#[stable(feature = "rust1", since = "1.0.0")] |
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pub use core::ascii::{EscapeDefault, escape_default}; |
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/// Extension methods for ASCII-subset only operations. |
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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!(AsciiExt::to_ascii_uppercase("café"), "CAFÉ"); |
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/// assert_eq!(AsciiExt::to_ascii_uppercase("café"), "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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#[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")] |
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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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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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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 value in its ASCII upper case equivalent. |
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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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/// To uppercase the value in-place, use [`make_ascii_uppercase`]. |
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/// |
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/// To uppercase ASCII characters in addition to non-ASCII characters, use |
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/// [`str::to_uppercase`]. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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/// |
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/// [`make_ascii_uppercase`]: #tymethod.make_ascii_uppercase |
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/// [`str::to_uppercase`]: ../primitive.str.html#method.to_uppercase |
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#[stable(feature = "rust1", since = "1.0.0")] |
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#[allow(deprecated)] |
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fn to_ascii_uppercase(&self) -> Self::Owned; |
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/// Makes a copy of the value in its ASCII lower case equivalent. |
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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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/// To lowercase the value in-place, use [`make_ascii_lowercase`]. |
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/// |
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/// To lowercase ASCII characters in addition to non-ASCII characters, use |
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/// [`str::to_lowercase`]. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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/// |
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/// [`make_ascii_lowercase`]: #tymethod.make_ascii_lowercase |
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/// [`str::to_lowercase`]: ../primitive.str.html#method.to_lowercase |
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#[stable(feature = "rust1", since = "1.0.0")] |
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#[allow(deprecated)] |
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fn to_ascii_lowercase(&self) -> Self::Owned; |
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/// Checks that two values 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 temporaries. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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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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/// 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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/// To return a new uppercased value without modifying the existing one, use |
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/// [`to_ascii_uppercase`]. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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/// |
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/// [`to_ascii_uppercase`]: #tymethod.to_ascii_uppercase |
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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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/// 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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/// To return a new lowercased value without modifying the existing one, use |
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/// [`to_ascii_lowercase`]. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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/// |
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/// [`to_ascii_lowercase`]: #tymethod.to_ascii_lowercase |
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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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/// Checks if the value is an ASCII alphabetic character: |
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/// U+0041 'A' ... U+005A 'Z' or U+0061 'a' ... U+007A 'z'. |
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/// For strings, true if all characters in the string are |
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/// ASCII alphabetic. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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#[unstable(feature = "ascii_ctype", issue = "39658")] |
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#[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")] |
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fn is_ascii_alphabetic(&self) -> bool { unimplemented!(); } |
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/// Checks if the value is an ASCII uppercase character: |
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/// U+0041 'A' ... U+005A 'Z'. |
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/// For strings, true if all characters in the string are |
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/// ASCII uppercase. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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#[unstable(feature = "ascii_ctype", issue = "39658")] |
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#[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")] |
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fn is_ascii_uppercase(&self) -> bool { unimplemented!(); } |
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/// Checks if the value is an ASCII lowercase character: |
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/// U+0061 'a' ... U+007A 'z'. |
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/// For strings, true if all characters in the string are |
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/// ASCII lowercase. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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#[unstable(feature = "ascii_ctype", issue = "39658")] |
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#[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")] |
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fn is_ascii_lowercase(&self) -> bool { unimplemented!(); } |
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/// Checks if the value is an ASCII alphanumeric character: |
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/// U+0041 'A' ... U+005A 'Z', U+0061 'a' ... U+007A 'z', or |
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/// U+0030 '0' ... U+0039 '9'. |
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/// For strings, true if all characters in the string are |
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/// ASCII alphanumeric. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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#[unstable(feature = "ascii_ctype", issue = "39658")] |
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#[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")] |
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fn is_ascii_alphanumeric(&self) -> bool { unimplemented!(); } |
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/// Checks if the value is an ASCII decimal digit: |
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/// U+0030 '0' ... U+0039 '9'. |
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/// For strings, true if all characters in the string are |
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/// ASCII digits. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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#[unstable(feature = "ascii_ctype", issue = "39658")] |
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#[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")] |
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fn is_ascii_digit(&self) -> bool { unimplemented!(); } |
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/// Checks if the value is an ASCII hexadecimal digit: |
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/// U+0030 '0' ... U+0039 '9', U+0041 'A' ... U+0046 'F', or |
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/// U+0061 'a' ... U+0066 'f'. |
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/// For strings, true if all characters in the string are |
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/// ASCII hex digits. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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#[unstable(feature = "ascii_ctype", issue = "39658")] |
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#[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")] |
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fn is_ascii_hexdigit(&self) -> bool { unimplemented!(); } |
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/// Checks if the value is an ASCII punctuation character: |
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/// |
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/// U+0021 ... U+002F `! " # $ % & ' ( ) * + , - . /` |
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/// U+003A ... U+0040 `: ; < = > ? @` |
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/// U+005B ... U+0060 ``[ \\ ] ^ _ ` `` |
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/// U+007B ... U+007E `{ | } ~` |
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/// |
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/// For strings, true if all characters in the string are |
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/// ASCII punctuation. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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#[unstable(feature = "ascii_ctype", issue = "39658")] |
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#[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")] |
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fn is_ascii_punctuation(&self) -> bool { unimplemented!(); } |
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/// Checks if the value is an ASCII graphic character: |
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/// U+0021 '!' ... U+007E '~'. |
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/// For strings, true if all characters in the string are |
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/// ASCII graphic characters. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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#[unstable(feature = "ascii_ctype", issue = "39658")] |
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#[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")] |
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fn is_ascii_graphic(&self) -> bool { unimplemented!(); } |
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/// Checks if the value is an ASCII whitespace character: |
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/// U+0020 SPACE, U+0009 HORIZONTAL TAB, U+000A LINE FEED, |
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/// U+000C FORM FEED, or U+000D CARRIAGE RETURN. |
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/// For strings, true if all characters in the string are |
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/// ASCII whitespace. |
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/// |
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/// Rust uses the WhatWG Infra Standard's [definition of ASCII |
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/// whitespace][infra-aw]. There are several other definitions in |
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/// wide use. For instance, [the POSIX locale][pct] includes |
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/// U+000B VERTICAL TAB as well as all the above characters, |
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/// but—from the very same specification—[the default rule for |
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/// "field splitting" in the Bourne shell][bfs] considers *only* |
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/// SPACE, HORIZONTAL TAB, and LINE FEED as whitespace. |
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/// |
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/// If you are writing a program that will process an existing |
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/// file format, check what that format's definition of whitespace is |
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/// before using this function. |
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/// |
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/// [infra-aw]: https://infra.spec.whatwg.org/#ascii-whitespace |
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/// [pct]: http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap07.html#tag_07_03_01 |
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/// [bfs]: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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#[unstable(feature = "ascii_ctype", issue = "39658")] |
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#[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")] |
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fn is_ascii_whitespace(&self) -> bool { unimplemented!(); } |
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/// Checks if the value is an ASCII control character: |
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/// U+0000 NUL ... U+001F UNIT SEPARATOR, or U+007F DELETE. |
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/// Note that most ASCII whitespace characters are control |
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/// characters, but SPACE is not. |
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/// |
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/// # Note |
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/// |
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/// This method will be deprecated in favor of the identically-named |
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/// inherent methods on `u8`, `char`, `[u8]` and `str`. |
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#[unstable(feature = "ascii_ctype", issue = "39658")] |
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#[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")] |
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fn is_ascii_control(&self) -> bool { unimplemented!(); } |
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} |
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macro_rules! delegating_ascii_methods { |
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() => { |
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#[inline] |
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fn is_ascii(&self) -> bool { self.is_ascii() } |
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#[inline] |
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fn to_ascii_uppercase(&self) -> Self::Owned { self.to_ascii_uppercase() } |
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#[inline] |
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fn to_ascii_lowercase(&self) -> Self::Owned { self.to_ascii_lowercase() } |
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#[inline] |
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fn eq_ignore_ascii_case(&self, o: &Self) -> bool { self.eq_ignore_ascii_case(o) } |
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#[inline] |
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fn make_ascii_uppercase(&mut self) { self.make_ascii_uppercase(); } |
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#[inline] |
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fn make_ascii_lowercase(&mut self) { self.make_ascii_lowercase(); } |
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} |
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} |
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macro_rules! delegating_ascii_ctype_methods { |
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() => { |
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#[inline] |
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fn is_ascii_alphabetic(&self) -> bool { self.is_ascii_alphabetic() } |
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#[inline] |
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fn is_ascii_uppercase(&self) -> bool { self.is_ascii_uppercase() } |
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#[inline] |
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fn is_ascii_lowercase(&self) -> bool { self.is_ascii_lowercase() } |
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#[inline] |
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fn is_ascii_alphanumeric(&self) -> bool { self.is_ascii_alphanumeric() } |
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#[inline] |
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fn is_ascii_digit(&self) -> bool { self.is_ascii_digit() } |
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#[inline] |
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fn is_ascii_hexdigit(&self) -> bool { self.is_ascii_hexdigit() } |
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#[inline] |
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fn is_ascii_punctuation(&self) -> bool { self.is_ascii_punctuation() } |
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#[inline] |
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fn is_ascii_graphic(&self) -> bool { self.is_ascii_graphic() } |
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#[inline] |
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fn is_ascii_whitespace(&self) -> bool { self.is_ascii_whitespace() } |
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#[inline] |
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fn is_ascii_control(&self) -> bool { self.is_ascii_control() } |
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} |
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} |
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#[stable(feature = "rust1", since = "1.0.0")] |
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#[allow(deprecated)] |
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impl AsciiExt for u8 { |
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type Owned = u8; |
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delegating_ascii_methods!(); |
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delegating_ascii_ctype_methods!(); |
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} |
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#[stable(feature = "rust1", since = "1.0.0")] |
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#[allow(deprecated)] |
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impl AsciiExt for char { |
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type Owned = char; |
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delegating_ascii_methods!(); |
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delegating_ascii_ctype_methods!(); |
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} |
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#[stable(feature = "rust1", since = "1.0.0")] |
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#[allow(deprecated)] |
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impl AsciiExt for [u8] { |
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type Owned = Vec<u8>; |
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delegating_ascii_methods!(); |
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#[inline] |
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fn is_ascii_alphabetic(&self) -> bool { |
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self.iter().all(|b| b.is_ascii_alphabetic()) |
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} |
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#[inline] |
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fn is_ascii_uppercase(&self) -> bool { |
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self.iter().all(|b| b.is_ascii_uppercase()) |
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} |
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#[inline] |
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fn is_ascii_lowercase(&self) -> bool { |
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self.iter().all(|b| b.is_ascii_lowercase()) |
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} |
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#[inline] |
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fn is_ascii_alphanumeric(&self) -> bool { |
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self.iter().all(|b| b.is_ascii_alphanumeric()) |
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} |
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#[inline] |
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fn is_ascii_digit(&self) -> bool { |
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self.iter().all(|b| b.is_ascii_digit()) |
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} |
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#[inline] |
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fn is_ascii_hexdigit(&self) -> bool { |
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self.iter().all(|b| b.is_ascii_hexdigit()) |
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} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_punctuation(&self) -> bool { |
|
|
self.iter().all(|b| b.is_ascii_punctuation()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_graphic(&self) -> bool { |
|
|
self.iter().all(|b| b.is_ascii_graphic()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_whitespace(&self) -> bool { |
|
|
self.iter().all(|b| b.is_ascii_whitespace()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_control(&self) -> bool { |
|
|
self.iter().all(|b| b.is_ascii_control()) |
|
|
} |
|
|
} |
|
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")] |
|
|
#[allow(deprecated)] |
|
|
impl AsciiExt for str { |
|
|
type Owned = String; |
|
|
|
|
|
delegating_ascii_methods!(); |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_alphabetic(&self) -> bool { |
|
|
self.bytes().all(|b| b.is_ascii_alphabetic()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_uppercase(&self) -> bool { |
|
|
self.bytes().all(|b| b.is_ascii_uppercase()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_lowercase(&self) -> bool { |
|
|
self.bytes().all(|b| b.is_ascii_lowercase()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_alphanumeric(&self) -> bool { |
|
|
self.bytes().all(|b| b.is_ascii_alphanumeric()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_digit(&self) -> bool { |
|
|
self.bytes().all(|b| b.is_ascii_digit()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_hexdigit(&self) -> bool { |
|
|
self.bytes().all(|b| b.is_ascii_hexdigit()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_punctuation(&self) -> bool { |
|
|
self.bytes().all(|b| b.is_ascii_punctuation()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_graphic(&self) -> bool { |
|
|
self.bytes().all(|b| b.is_ascii_graphic()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_whitespace(&self) -> bool { |
|
|
self.bytes().all(|b| b.is_ascii_whitespace()) |
|
|
} |
|
|
|
|
|
#[inline] |
|
|
fn is_ascii_control(&self) -> bool { |
|
|
self.bytes().all(|b| b.is_ascii_control()) |
|
|
} |
|
|
}
|
|
|
|
