// the code is split up here to improve execution speed for cases where
// the `radix` is constant and 10 or smaller
- let val = if radix <= 10 {
+ let val = if radix <= 10 {
match self {
- '0' ..= '9' => self as u32 - '0' as u32,
+ '0'..='9' => self as u32 - '0' as u32,
_ => return None,
}
} else {
}
};
- if val < radix { Some(val) }
- else { None }
+ if val < radix {
+ Some(val)
+ } else {
+ None
+ }
}
/// Returns an iterator that yields the hexadecimal Unicode escape of a
'\r' => EscapeDefaultState::Backslash('r'),
'\n' => EscapeDefaultState::Backslash('n'),
'\\' | '\'' | '"' => EscapeDefaultState::Backslash(self),
- '\x20' ..= '\x7e' => EscapeDefaultState::Char(self),
- _ => EscapeDefaultState::Unicode(self.escape_unicode())
+ '\x20'..='\x7e' => EscapeDefaultState::Char(self),
+ _ => EscapeDefaultState::Unicode(self.escape_unicode()),
};
EscapeDefault { state: init_state }
}
pub fn encode_utf8(self, dst: &mut [u8]) -> &mut str {
let code = self as u32;
unsafe {
- let len =
- if code < MAX_ONE_B && !dst.is_empty() {
+ let len = if code < MAX_ONE_B && !dst.is_empty() {
*dst.get_unchecked_mut(0) = code as u8;
1
} else if code < MAX_TWO_B && dst.len() >= 2 {
*dst.get_unchecked_mut(0) = (code >> 6 & 0x1F) as u8 | TAG_TWO_B;
*dst.get_unchecked_mut(1) = (code & 0x3F) as u8 | TAG_CONT;
2
- } else if code < MAX_THREE_B && dst.len() >= 3 {
+ } else if code < MAX_THREE_B && dst.len() >= 3 {
*dst.get_unchecked_mut(0) = (code >> 12 & 0x0F) as u8 | TAG_THREE_B;
- *dst.get_unchecked_mut(1) = (code >> 6 & 0x3F) as u8 | TAG_CONT;
+ *dst.get_unchecked_mut(1) = (code >> 6 & 0x3F) as u8 | TAG_CONT;
*dst.get_unchecked_mut(2) = (code & 0x3F) as u8 | TAG_CONT;
3
} else if dst.len() >= 4 {
*dst.get_unchecked_mut(0) = (code >> 18 & 0x07) as u8 | TAG_FOUR_B;
*dst.get_unchecked_mut(1) = (code >> 12 & 0x3F) as u8 | TAG_CONT;
- *dst.get_unchecked_mut(2) = (code >> 6 & 0x3F) as u8 | TAG_CONT;
+ *dst.get_unchecked_mut(2) = (code >> 6 & 0x3F) as u8 | TAG_CONT;
*dst.get_unchecked_mut(3) = (code & 0x3F) as u8 | TAG_CONT;
4
} else {
- panic!("encode_utf8: need {} bytes to encode U+{:X}, but the buffer has {}",
+ panic!(
+ "encode_utf8: need {} bytes to encode U+{:X}, but the buffer has {}",
from_u32_unchecked(code).len_utf8(),
code,
- dst.len())
+ dst.len(),
+ )
};
from_utf8_unchecked_mut(dst.get_unchecked_mut(..len))
}
*dst.get_unchecked_mut(1) = 0xDC00 | ((code as u16) & 0x3FF);
slice::from_raw_parts_mut(dst.as_mut_ptr(), 2)
} else {
- panic!("encode_utf16: need {} units to encode U+{:X}, but the buffer has {}",
+ panic!(
+ "encode_utf16: need {} units to encode U+{:X}, but the buffer has {}",
from_u32_unchecked(code).len_utf16(),
code,
- dst.len())
+ dst.len(),
+ )
}
}
}
- /// Returns `true` if this `char` is an alphabetic code point, and false if not.
+ /// Returns `true` if this `char` has the `Alphabetic` property.
+ ///
+ /// `Alphabetic` is described in Chapter 4 (Character Properties) of the [Unicode Standard] and
+ /// specified in the [Unicode Character Database][ucd] [`DerivedCoreProperties.txt`].
+ ///
+ /// [Unicode Standard]: https://www.unicode.org/versions/latest/
+ /// [ucd]: https://www.unicode.org/reports/tr44/
+ /// [`DerivedCoreProperties.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/DerivedCoreProperties.txt
///
/// # Examples
///
}
}
- /// Returns `true` if this `char` is lowercase.
+ /// Returns `true` if this `char` has the `Lowercase` property.
///
- /// 'Lowercase' is defined according to the terms of the Unicode Derived Core
- /// Property `Lowercase`.
+ /// `Lowercase` is described in Chapter 4 (Character Properties) of the [Unicode Standard] and
+ /// specified in the [Unicode Character Database][ucd] [`DerivedCoreProperties.txt`].
+ ///
+ /// [Unicode Standard]: https://www.unicode.org/versions/latest/
+ /// [ucd]: https://www.unicode.org/reports/tr44/
+ /// [`DerivedCoreProperties.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/DerivedCoreProperties.txt
///
/// # Examples
///
}
}
- /// Returns `true` if this `char` is uppercase.
+ /// Returns `true` if this `char` has the `Uppercase` property.
+ ///
+ /// `Uppercase` is described in Chapter 4 (Character Properties) of the [Unicode Standard] and
+ /// specified in the [Unicode Character Database][ucd] [`DerivedCoreProperties.txt`].
///
- /// 'Uppercase' is defined according to the terms of the Unicode Derived Core
- /// Property `Uppercase`.
+ /// [Unicode Standard]: https://www.unicode.org/versions/latest/
+ /// [ucd]: https://www.unicode.org/reports/tr44/
+ /// [`DerivedCoreProperties.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/DerivedCoreProperties.txt
///
/// # Examples
///
}
}
- /// Returns `true` if this `char` is whitespace.
+ /// Returns `true` if this `char` has the `White_Space` property.
///
- /// 'Whitespace' is defined according to the terms of the Unicode Derived Core
- /// Property `White_Space`.
+ /// `White_Space` is specified in the [Unicode Character Database][ucd] [`PropList.txt`].
+ ///
+ /// [ucd]: https://www.unicode.org/reports/tr44/
+ /// [`PropList.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/PropList.txt
///
/// # Examples
///
}
}
- /// Returns `true` if this `char` is alphanumeric.
+ /// Returns `true` if this `char` satisfies either [`is_alphabetic()`] or [`is_numeric()`].
///
- /// 'Alphanumeric'-ness is defined in terms of the Unicode General Categories
- /// `Nd`, `Nl`, `No` and the Derived Core Property `Alphabetic`.
+ /// [`is_alphabetic()`]: #method.is_alphabetic
+ /// [`is_numeric()`]: #method.is_numeric
///
/// # Examples
///
self.is_alphabetic() || self.is_numeric()
}
- /// Returns `true` if this `char` is a control code point.
+ /// Returns `true` if this `char` has the general category for control codes.
+ ///
+ /// Control codes (code points with the general category of `Cc`) are described in Chapter 4
+ /// (Character Properties) of the [Unicode Standard] and specified in the [Unicode Character
+ /// Database][ucd] [`UnicodeData.txt`].
///
- /// 'Control code point' is defined in terms of the Unicode General
- /// Category `Cc`.
+ /// [Unicode Standard]: https://www.unicode.org/versions/latest/
+ /// [ucd]: https://www.unicode.org/reports/tr44/
+ /// [`UnicodeData.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt
///
/// # Examples
///
general_category::Cc(self)
}
- /// Returns `true` if this `char` is an extended grapheme character.
+ /// Returns `true` if this `char` has the `Grapheme_Extend` property.
///
- /// 'Extended grapheme character' is defined in terms of the Unicode Shaping and Rendering
- /// Category `Grapheme_Extend`.
+ /// `Grapheme_Extend` is described in [Unicode Standard Annex #29 (Unicode Text
+ /// Segmentation)][uax29] and specified in the [Unicode Character Database][ucd]
+ /// [`DerivedCoreProperties.txt`].
+ ///
+ /// [uax29]: https://www.unicode.org/reports/tr29/
+ /// [ucd]: https://www.unicode.org/reports/tr44/
+ /// [`DerivedCoreProperties.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/DerivedCoreProperties.txt
#[inline]
pub(crate) fn is_grapheme_extended(self) -> bool {
derived_property::Grapheme_Extend(self)
}
- /// Returns `true` if this `char` is numeric.
+ /// Returns `true` if this `char` has one of the general categories for numbers.
+ ///
+ /// The general categories for numbers (`Nd` for decimal digits, `Nl` for letter-like numeric
+ /// characters, and `No` for other numeric characters) are specified in the [Unicode Character
+ /// Database][ucd] [`UnicodeData.txt`].
///
- /// 'Numeric'-ness is defined in terms of the Unicode General Categories
- /// `Nd`, `Nl`, `No`.
+ /// [Unicode Standard]: https://www.unicode.org/versions/latest/
+ /// [ucd]: https://www.unicode.org/reports/tr44/
+ /// [`UnicodeData.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt
///
/// # Examples
///
}
}
- /// Returns an iterator that yields the lowercase equivalent of a `char`
- /// as one or more `char`s.
+ /// Returns an iterator that yields the lowercase mapping of this `char` as one or more
+ /// `char`s.
///
- /// If a character does not have a lowercase equivalent, the same character
- /// will be returned back by the iterator.
+ /// If this `char` does not have a lowercase mapping, the iterator yields the same `char`.
///
- /// This performs complex unconditional mappings with no tailoring: it maps
- /// one Unicode character to its lowercase equivalent according to the
- /// [Unicode database] and the additional complex mappings
- /// [`SpecialCasing.txt`]. Conditional mappings (based on context or
- /// language) are not considered here.
+ /// If this `char` has a one-to-one lowercase mapping given by the [Unicode Character
+ /// Database][ucd] [`UnicodeData.txt`], the iterator yields that `char`.
///
- /// For a full reference, see [here][reference].
+ /// [ucd]: https://www.unicode.org/reports/tr44/
+ /// [`UnicodeData.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt
///
- /// [Unicode database]: ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt
+ /// If this `char` requires special considerations (e.g. multiple `char`s) the iterator yields
+ /// the `char`(s) given by [`SpecialCasing.txt`].
///
- /// [`SpecialCasing.txt`]: ftp://ftp.unicode.org/Public/UNIDATA/SpecialCasing.txt
+ /// [`SpecialCasing.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/SpecialCasing.txt
///
- /// [reference]: http://www.unicode.org/versions/Unicode7.0.0/ch03.pdf#G33992
+ /// This operation performs an unconditional mapping without tailoring. That is, the conversion
+ /// is independent of context and language.
+ ///
+ /// In the [Unicode Standard], Chapter 4 (Character Properties) discusses case mapping in
+ /// general and Chapter 3 (Conformance) discusses the default algorithm for case conversion.
+ ///
+ /// [Unicode Standard]: https://www.unicode.org/versions/latest/
///
/// # Examples
///
ToLowercase(CaseMappingIter::new(conversions::to_lower(self)))
}
- /// Returns an iterator that yields the uppercase equivalent of a `char`
- /// as one or more `char`s.
+ /// Returns an iterator that yields the uppercase mapping of this `char` as one or more
+ /// `char`s.
+ ///
+ /// If this `char` does not have a uppercase mapping, the iterator yields the same `char`.
+ ///
+ /// If this `char` has a one-to-one uppercase mapping given by the [Unicode Character
+ /// Database][ucd] [`UnicodeData.txt`], the iterator yields that `char`.
///
- /// If a character does not have an uppercase equivalent, the same character
- /// will be returned back by the iterator.
+ /// [ucd]: https://www.unicode.org/reports/tr44/
+ /// [`UnicodeData.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt
///
- /// This performs complex unconditional mappings with no tailoring: it maps
- /// one Unicode character to its uppercase equivalent according to the
- /// [Unicode database] and the additional complex mappings
- /// [`SpecialCasing.txt`]. Conditional mappings (based on context or
- /// language) are not considered here.
+ /// If this `char` requires special considerations (e.g. multiple `char`s) the iterator yields
+ /// the `char`(s) given by [`SpecialCasing.txt`].
///
- /// For a full reference, see [here][reference].
+ /// [`SpecialCasing.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/SpecialCasing.txt
///
- /// [Unicode database]: ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt
+ /// This operation performs an unconditional mapping without tailoring. That is, the conversion
+ /// is independent of context and language.
///
- /// [`SpecialCasing.txt`]: ftp://ftp.unicode.org/Public/UNIDATA/SpecialCasing.txt
+ /// In the [Unicode Standard], Chapter 4 (Character Properties) discusses case mapping in
+ /// general and Chapter 3 (Conformance) discusses the default algorithm for case conversion.
///
- /// [reference]: http://www.unicode.org/versions/Unicode7.0.0/ch03.pdf#G33992
+ /// [Unicode Standard]: https://www.unicode.org/versions/latest/
///
/// # Examples
///
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