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    // Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! Operations on ASCII strings and characters.
    //!
    //! Most string operations in Rust act on UTF-8 strings. However, at times it
    //! makes more sense to only consider the ASCII character set for a specific
    //! operation.
    //!
    //! The [`AsciiExt`] trait provides methods that allow for character
    //! operations that only act on the ASCII subset and leave non-ASCII characters
    //! alone.
    //!
    //! The [`escape_default`] function provides an iterator over the bytes of an
    //! escaped version of the character given.
    //!
    //! [`AsciiExt`]: trait.AsciiExt.html
    //! [`escape_default`]: fn.escape_default.html

    #![stable(feature = "rust1", since = "1.0.0")]

    #[stable(feature = "rust1", since = "1.0.0")]
    pub use core::ascii::{EscapeDefault, escape_default};

    /// 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}"`.
    ///
    /// [combining character]: https://en.wikipedia.org/wiki/Combining_character
    #[stable(feature = "rust1", since = "1.0.0")]
    #[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")]
    pub trait AsciiExt {
        /// Container type for copied ASCII characters.
        #[stable(feature = "rust1", since = "1.0.0")]
        type Owned;

        /// Checks if the value is within the ASCII range.
        ///
        /// # Note
        ///
        /// This method will be deprecated in favor of the identically-named
        /// inherent methods on `u8`, `char`, `[u8]` and `str`.
        #[stable(feature = "rust1", since = "1.0.0")]
        fn is_ascii(&self) -> bool;

        /// 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 will be deprecated in favor of the identically-named
        /// inherent methods on `u8`, `char`, `[u8]` and `str`.
        ///
        /// [`make_ascii_uppercase`]: #tymethod.make_ascii_uppercase
        /// [`str::to_uppercase`]: ../primitive.str.html#method.to_uppercase
        #[stable(feature = "rust1", since = "1.0.0")]
        #[allow(deprecated)]
        fn to_ascii_uppercase(&self) -> Self::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 will be deprecated in favor of the identically-named
        /// inherent methods on `u8`, `char`, `[u8]` and `str`.
        ///
        /// [`make_ascii_lowercase`]: #tymethod.make_ascii_lowercase
        /// [`str::to_lowercase`]: ../primitive.str.html#method.to_lowercase
        #[stable(feature = "rust1", since = "1.0.0")]
        #[allow(deprecated)]
        fn to_ascii_lowercase(&self) -> Self::Owned;

        /// 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 will be deprecated in favor of the identically-named
        /// inherent methods on `u8`, `char`, `[u8]` and `str`.
        #[stable(feature = "rust1", since = "1.0.0")]
        fn eq_ignore_ascii_case(&self, other: &Self) -> bool;

        /// 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 will be deprecated in favor of the identically-named
        /// inherent methods on `u8`, `char`, `[u8]` and `str`.
        ///
        /// [`to_ascii_uppercase`]: #tymethod.to_ascii_uppercase
        #[stable(feature = "ascii", since = "1.9.0")]
        fn make_ascii_uppercase(&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 will be deprecated in favor of the identically-named
        /// inherent methods on `u8`, `char`, `[u8]` and `str`.
        ///
        /// [`to_ascii_lowercase`]: #tymethod.to_ascii_lowercase
        #[stable(feature = "ascii", since = "1.9.0")]
        fn make_ascii_lowercase(&mut self);

        /// Checks if the value is an ASCII alphabetic character:
        /// U+0041 'A' ... U+005A 'Z' or U+0061 'a' ... U+007A 'z'.
        /// For strings, true if all characters in the string are
        /// ASCII alphabetic.
        ///
        /// # Note
        ///
        /// This method will be deprecated in favor of the identically-named
        /// inherent methods on `u8` and `char`.
        /// For `[u8]` use `.iter().all(u8::is_ascii_alphabetic)`.
        /// For `str` use `.bytes().all(u8::is_ascii_alphabetic)`.
        #[unstable(feature = "ascii_ctype", issue = "39658")]
        #[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")]
        fn is_ascii_alphabetic(&self) -> bool { unimplemented!(); }

        /// Checks if the value is an ASCII uppercase character:
        /// U+0041 'A' ... U+005A 'Z'.
        /// For strings, true if all characters in the string are
        /// ASCII uppercase.
        ///
        /// # Note
        ///
        /// This method will be deprecated in favor of the identically-named
        /// inherent methods on `u8` and `char`.
        /// For `[u8]` use `.iter().all(u8::is_ascii_uppercase)`.
        /// For `str` use `.bytes().all(u8::is_ascii_uppercase)`.
        #[unstable(feature = "ascii_ctype", issue = "39658")]
        #[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")]
        fn is_ascii_uppercase(&self) -> bool { unimplemented!(); }

        /// Checks if the value is an ASCII lowercase character:
        /// U+0061 'a' ... U+007A 'z'.
        /// For strings, true if all characters in the string are
        /// ASCII lowercase.
        ///
        /// # Note
        ///
        /// This method will be deprecated in favor of the identically-named
        /// inherent methods on `u8` and `char`.
        /// For `[u8]` use `.iter().all(u8::is_ascii_lowercase)`.
        /// For `str` use `.bytes().all(u8::is_ascii_lowercase)`.
        #[unstable(feature = "ascii_ctype", issue = "39658")]
        #[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")]
        fn is_ascii_lowercase(&self) -> bool { unimplemented!(); }

        /// Checks if the value is an ASCII alphanumeric character:
        /// U+0041 'A' ... U+005A 'Z', U+0061 'a' ... U+007A 'z', or
        /// U+0030 '0' ... U+0039 '9'.
        /// For strings, true if all characters in the string are
        /// ASCII alphanumeric.
        ///
        /// # Note
        ///
        /// This method will be deprecated in favor of the identically-named
        /// inherent methods on `u8` and `char`.
        /// For `[u8]` use `.iter().all(u8::is_ascii_alphanumeric)`.
        /// For `str` use `.bytes().all(u8::is_ascii_alphanumeric)`.
        #[unstable(feature = "ascii_ctype", issue = "39658")]
        #[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")]
        fn is_ascii_alphanumeric(&self) -> bool { unimplemented!(); }

        /// Checks if the value is an ASCII decimal digit:
        /// U+0030 '0' ... U+0039 '9'.
        /// For strings, true if all characters in the string are
        /// ASCII digits.
        ///
        /// # Note
        ///
        /// This method will be deprecated in favor of the identically-named
        /// inherent methods on `u8` and `char`.
        /// For `[u8]` use `.iter().all(u8::is_ascii_digit)`.
        /// For `str` use `.bytes().all(u8::is_ascii_digit)`.
        #[unstable(feature = "ascii_ctype", issue = "39658")]
        #[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")]
        fn is_ascii_digit(&self) -> bool { unimplemented!(); }

        /// Checks if the value is an ASCII hexadecimal digit:
        /// U+0030 '0' ... U+0039 '9', U+0041 'A' ... U+0046 'F', or
        /// U+0061 'a' ... U+0066 'f'.
        /// For strings, true if all characters in the string are
        /// ASCII hex digits.
        ///
        /// # Note
        ///
        /// This method will be deprecated in favor of the identically-named
        /// inherent methods on `u8` and `char`.
        /// For `[u8]` use `.iter().all(u8::is_ascii_hexdigit)`.
        /// For `str` use `.bytes().all(u8::is_ascii_hexdigit)`.
        #[unstable(feature = "ascii_ctype", issue = "39658")]
        #[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")]
        fn is_ascii_hexdigit(&self) -> bool { unimplemented!(); }

        /// Checks if the value is an ASCII punctuation character:
        ///
        /// U+0021 ... U+002F `! " # $ % & ' ( ) * + , - . /`
        /// U+003A ... U+0040 `: ; < = > ? @`
        /// U+005B ... U+0060 ``[ \\ ] ^ _ ` ``
        /// U+007B ... U+007E `{ | } ~`
        ///
        /// For strings, true if all characters in the string are
        /// ASCII punctuation.
        ///
        /// # Note
        ///
        /// This method will be deprecated in favor of the identically-named
        /// inherent methods on `u8` and `char`.
        /// For `[u8]` use `.iter().all(u8::is_ascii_punctuation)`.
        /// For `str` use `.bytes().all(u8::is_ascii_punctuation)`.
        #[unstable(feature = "ascii_ctype", issue = "39658")]
        #[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")]
        fn is_ascii_punctuation(&self) -> bool { unimplemented!(); }

        /// Checks if the value is an ASCII graphic character:
        /// U+0021 '!' ... U+007E '~'.
        /// For strings, true if all characters in the string are
        /// ASCII graphic characters.
        ///
        /// # Note
        ///
        /// This method will be deprecated in favor of the identically-named
        /// inherent methods on `u8` and `char`.
        /// For `[u8]` use `.iter().all(u8::is_ascii_graphic)`.
        /// For `str` use `.bytes().all(u8::is_ascii_graphic)`.
        #[unstable(feature = "ascii_ctype", issue = "39658")]
        #[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")]
        fn is_ascii_graphic(&self) -> bool { unimplemented!(); }

        /// Checks if the value is an ASCII whitespace character:
        /// U+0020 SPACE, U+0009 HORIZONTAL TAB, U+000A LINE FEED,
        /// U+000C FORM FEED, or U+000D CARRIAGE RETURN.
        /// For strings, true if all characters in the string are
        /// ASCII whitespace.
        ///
        /// Rust uses the WhatWG Infra Standard's [definition of ASCII
        /// whitespace][infra-aw].  There are several other definitions in
        /// wide use.  For instance, [the POSIX locale][pct] includes
        /// U+000B VERTICAL TAB as well as all the above characters,
        /// but—from the very same specification—[the default rule for
        /// "field splitting" in the Bourne shell][bfs] considers *only*
        /// SPACE, HORIZONTAL TAB, and LINE FEED as whitespace.
        ///
        /// If you are writing a program that will process an existing
        /// file format, check what that format's definition of whitespace is
        /// before using this function.
        ///
        /// [infra-aw]: https://infra.spec.whatwg.org/#ascii-whitespace
        /// [pct]: http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap07.html#tag_07_03_01
        /// [bfs]: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05
        ///
        /// # Note
        ///
        /// This method will be deprecated in favor of the identically-named
        /// inherent methods on `u8` and `char`.
        /// For `[u8]` use `.iter().all(u8::is_ascii_whitespace)`.
        /// For `str` use `.bytes().all(u8::is_ascii_whitespace)`.
        #[unstable(feature = "ascii_ctype", issue = "39658")]
        #[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")]
        fn is_ascii_whitespace(&self) -> bool { unimplemented!(); }

        /// Checks if the value is an ASCII control character:
        /// U+0000 NUL ... U+001F UNIT SEPARATOR, or U+007F DELETE.
        /// Note that most ASCII whitespace characters are control
        /// characters, but SPACE is not.
        ///
        /// # Note
        ///
        /// This method will be deprecated in favor of the identically-named
        /// inherent methods on `u8` and `char`.
        /// For `[u8]` use `.iter().all(u8::is_ascii_control)`.
        /// For `str` use `.bytes().all(u8::is_ascii_control)`.
        #[unstable(feature = "ascii_ctype", issue = "39658")]
        #[rustc_deprecated(since = "1.26.0", reason = "use inherent methods instead")]
        fn is_ascii_control(&self) -> bool { unimplemented!(); }
    }

    macro_rules! delegating_ascii_methods {
        () => {
            #[inline]
            fn is_ascii(&self) -> bool { self.is_ascii() }

            #[inline]
            fn to_ascii_uppercase(&self) -> Self::Owned { self.to_ascii_uppercase() }

            #[inline]
            fn to_ascii_lowercase(&self) -> Self::Owned { self.to_ascii_lowercase() }

            #[inline]
            fn eq_ignore_ascii_case(&self, o: &Self) -> bool { self.eq_ignore_ascii_case(o) }

            #[inline]
            fn make_ascii_uppercase(&mut self) { self.make_ascii_uppercase(); }

            #[inline]
            fn make_ascii_lowercase(&mut self) { self.make_ascii_lowercase(); }
        }
    }

    macro_rules! delegating_ascii_ctype_methods {
        () => {
            #[inline]
            fn is_ascii_alphabetic(&self) -> bool { self.is_ascii_alphabetic() }

            #[inline]
            fn is_ascii_uppercase(&self) -> bool { self.is_ascii_uppercase() }

            #[inline]
            fn is_ascii_lowercase(&self) -> bool { self.is_ascii_lowercase() }

            #[inline]
            fn is_ascii_alphanumeric(&self) -> bool { self.is_ascii_alphanumeric() }

            #[inline]
            fn is_ascii_digit(&self) -> bool { self.is_ascii_digit() }

            #[inline]
            fn is_ascii_hexdigit(&self) -> bool { self.is_ascii_hexdigit() }

            #[inline]
            fn is_ascii_punctuation(&self) -> bool { self.is_ascii_punctuation() }

            #[inline]
            fn is_ascii_graphic(&self) -> bool { self.is_ascii_graphic() }

            #[inline]
            fn is_ascii_whitespace(&self) -> bool { self.is_ascii_whitespace() }

            #[inline]
            fn is_ascii_control(&self) -> bool { self.is_ascii_control() }
        }
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    #[allow(deprecated)]
    impl AsciiExt for u8 {
        type Owned = u8;

        delegating_ascii_methods!();
        delegating_ascii_ctype_methods!();
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    #[allow(deprecated)]
    impl AsciiExt for char {
        type Owned = char;

        delegating_ascii_methods!();
        delegating_ascii_ctype_methods!();
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    #[allow(deprecated)]
    impl AsciiExt for [u8] {
        type Owned = Vec<u8>;

        delegating_ascii_methods!();

        #[inline]
        fn is_ascii_alphabetic(&self) -> bool {
            self.iter().all(|b| b.is_ascii_alphabetic())
        }

        #[inline]
        fn is_ascii_uppercase(&self) -> bool {
            self.iter().all(|b| b.is_ascii_uppercase())
        }

        #[inline]
        fn is_ascii_lowercase(&self) -> bool {
            self.iter().all(|b| b.is_ascii_lowercase())
        }

        #[inline]
        fn is_ascii_alphanumeric(&self) -> bool {
            self.iter().all(|b| b.is_ascii_alphanumeric())
        }

        #[inline]
        fn is_ascii_digit(&self) -> bool {
            self.iter().all(|b| b.is_ascii_digit())
        }

        #[inline]
        fn is_ascii_hexdigit(&self) -> bool {
            self.iter().all(|b| b.is_ascii_hexdigit())
        }

        #[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())
        }
    }

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