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feat: add display UI with splash screen, dashboard, and RSSI sparkline

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Implement full SSD1306 OLED display support:
- Splash screen on boot (1.5s) with project name, version, board
- Dashboard showing radio state, config, counters, RSSI/SNR
- RSSI history sparkline (64-sample ring buffer, 2px-wide bars)
- DisplayOn/DisplayOff host commands routed via dedicated channel
- Pure render functions against generic DrawTarget (no hardware coupling)
- Display on/off control bypasses radio task entirely

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
swaitsandClaude Opus 4.6 committed 2026-03-29 20:42:54 -06:00
1 parent 7064110293
commit 3102fc747a
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+4564928 -38
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vendor/encode_unicode/src/utf16_char.rs
Vendored
+687
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@@ -0,0 +1,687 @@
/* Copyright 2016 The encode_unicode Developers
*
* Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
* http://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.
*/
use utf16_iterators::Utf16Iterator;
use traits::{CharExt, U16UtfExt};
use utf8_char::Utf8Char;
use errors::{InvalidUtf16Slice, InvalidUtf16Array, InvalidUtf16Tuple};
use errors::{NonBMPError, EmptyStrError, FromStrError};
extern crate core;
use self::core::{hash,fmt};
use self::core::cmp::Ordering;
use self::core::borrow::Borrow;
use self::core::ops::Deref;
use self::core::str::FromStr;
#[cfg(feature="std")]
use self::core::iter::FromIterator;
#[cfg(feature="std")]
#[allow(deprecated)]
use std::ascii::AsciiExt;
#[cfg(feature="ascii")]
use self::core::char;
#[cfg(feature="ascii")]
extern crate ascii;
#[cfg(feature="ascii")]
use self::ascii::{AsciiChar,ToAsciiChar,ToAsciiCharError};
// I don't think there is any good default value for char, but char does.
#[derive(Default)]
// char doesn't do anything more advanced than u32 for Eq/Ord, so we shouldn't either.
// When it's a single unit, the second is zero, so Eq works.
// #[derive(Ord)] however, breaks on surrogate pairs.
#[derive(PartialEq,Eq)]
#[derive(Clone,Copy)]
/// An unicode codepoint stored as UTF-16.
///
/// It can be borrowed as an `u16` slice, and has the same size as `char`.
pub struct Utf16Char {
units: [u16; 2],
}
/////////////////////
//conversion traits//
/////////////////////
impl FromStr for Utf16Char {
type Err = FromStrError;
/// Create an `Utf16Char` from a string slice.
/// The string must contain exactly one codepoint.
///
/// # Examples
///
/// ```
/// use encode_unicode::error::FromStrError::*;
/// use encode_unicode::Utf16Char;
/// use std::str::FromStr;
///
/// assert_eq!(Utf16Char::from_str("a"), Ok(Utf16Char::from('a')));
/// assert_eq!(Utf16Char::from_str("🂠"), Ok(Utf16Char::from('🂠')));
/// assert_eq!(Utf16Char::from_str(""), Err(Empty));
/// assert_eq!(Utf16Char::from_str("ab"), Err(MultipleCodepoints));
/// assert_eq!(Utf16Char::from_str("é"), Err(MultipleCodepoints));// 'e'+u301 combining mark
/// ```
fn from_str(s: &str) -> Result<Self, FromStrError> {
match Utf16Char::from_str_start(s) {
Ok((u16c,bytes)) if bytes == s.len() => Ok(u16c),
Ok((_,_)) => Err(FromStrError::MultipleCodepoints),
Err(EmptyStrError) => Err(FromStrError::Empty),
}
}
}
impl From<char> for Utf16Char {
fn from(c: char) -> Self {
let (first, second) = c.to_utf16_tuple();
Utf16Char{ units: [first, second.unwrap_or(0)] }
}
}
impl From<Utf8Char> for Utf16Char {
fn from(utf8: Utf8Char) -> Utf16Char {
let (b, utf8_len) = utf8.to_array();
match utf8_len {
1 => Utf16Char{ units: [b[0] as u16, 0] },
4 => {// need surrogate
let mut first = 0xd800 - (0x01_00_00u32 >> 10) as u16;
first += (b[0] as u16 & 0x07) << 8;
first += (b[1] as u16 & 0x3f) << 2;
first += (b[2] as u16 & 0x30) >> 4;
let mut second = 0xdc00;
second |= (b[2] as u16 & 0x0f) << 6;
second |= b[3] as u16 & 0x3f;
Utf16Char{ units: [first, second] }
},
_ => { // 2 or 3
let mut unit = ((b[0] as u16 & 0x1f) << 6) | (b[1] as u16 & 0x3f);
if utf8_len == 3 {
unit = (unit << 6) | (b[2] as u16 & 0x3f);
}
Utf16Char{ units: [unit, 0] }
},
}
}
}
impl From<Utf16Char> for char {
fn from(uc: Utf16Char) -> char {
char::from_utf16_array_unchecked(uc.to_array())
}
}
impl IntoIterator for Utf16Char {
type Item=u16;
type IntoIter=Utf16Iterator;
/// Iterate over the units.
fn into_iter(self) -> Utf16Iterator {
Utf16Iterator::from(self)
}
}
#[cfg(feature="std")]
impl Extend<Utf16Char> for Vec<u16> {
fn extend<I:IntoIterator<Item=Utf16Char>>(&mut self, iter: I) {
let iter = iter.into_iter();
self.reserve(iter.size_hint().0);
for u16c in iter {
self.push(u16c.units[0]);
if u16c.units[1] != 0 {
self.push(u16c.units[1]);
}
}
}
}
#[cfg(feature="std")]
impl<'a> Extend<&'a Utf16Char> for Vec<u16> {
fn extend<I:IntoIterator<Item=&'a Utf16Char>>(&mut self, iter: I) {
self.extend(iter.into_iter().cloned())
}
}
#[cfg(feature="std")]
impl FromIterator<Utf16Char> for Vec<u16> {
fn from_iter<I:IntoIterator<Item=Utf16Char>>(iter: I) -> Self {
let mut vec = Vec::new();
vec.extend(iter);
return vec;
}
}
#[cfg(feature="std")]
impl<'a> FromIterator<&'a Utf16Char> for Vec<u16> {
fn from_iter<I:IntoIterator<Item=&'a Utf16Char>>(iter: I) -> Self {
Self::from_iter(iter.into_iter().cloned())
}
}
#[cfg(feature="std")]
impl Extend<Utf16Char> for String {
fn extend<I:IntoIterator<Item=Utf16Char>>(&mut self, iter: I) {
self.extend(iter.into_iter().map(|u16c| Utf8Char::from(u16c) ));
}
}
#[cfg(feature="std")]
impl<'a> Extend<&'a Utf16Char> for String {
fn extend<I:IntoIterator<Item=&'a Utf16Char>>(&mut self, iter: I) {
self.extend(iter.into_iter().cloned());
}
}
#[cfg(feature="std")]
impl FromIterator<Utf16Char> for String {
fn from_iter<I:IntoIterator<Item=Utf16Char>>(iter: I) -> Self {
let mut s = String::new();
s.extend(iter);
return s;
}
}
#[cfg(feature="std")]
impl<'a> FromIterator<&'a Utf16Char> for String {
fn from_iter<I:IntoIterator<Item=&'a Utf16Char>>(iter: I) -> Self {
Self::from_iter(iter.into_iter().cloned())
}
}
/////////////////
//getter traits//
/////////////////
impl AsRef<[u16]> for Utf16Char {
#[inline]
fn as_ref(&self) -> &[u16] {
&self.units[..self.len()]
}
}
impl Borrow<[u16]> for Utf16Char {
#[inline]
fn borrow(&self) -> &[u16] {
self.as_ref()
}
}
impl Deref for Utf16Char {
type Target = [u16];
#[inline]
fn deref(&self) -> &[u16] {
self.as_ref()
}
}
////////////////
//ascii traits//
////////////////
#[cfg(feature="std")]
#[allow(deprecated)]
impl AsciiExt for Utf16Char {
type Owned = Self;
fn is_ascii(&self) -> bool {
self.units[0] < 128
}
fn eq_ignore_ascii_case(&self, other: &Self) -> bool {
self.to_ascii_lowercase() == other.to_ascii_lowercase()
}
fn to_ascii_uppercase(&self) -> Self {
let n = self.units[0].wrapping_sub(b'a' as u16);
if n < 26 {Utf16Char{ units: [n+b'A' as u16, 0] }}
else {*self}
}
fn to_ascii_lowercase(&self) -> Self {
let n = self.units[0].wrapping_sub(b'A' as u16);
if n < 26 {Utf16Char{ units: [n+b'a' as u16, 0] }}
else {*self}
}
fn make_ascii_uppercase(&mut self) {
*self = self.to_ascii_uppercase()
}
fn make_ascii_lowercase(&mut self) {
*self = self.to_ascii_lowercase();
}
}
#[cfg(feature="ascii")]
/// Requires the feature "ascii".
impl From<AsciiChar> for Utf16Char {
#[inline]
fn from(ac: AsciiChar) -> Self {
Utf16Char{ units: [ac.as_byte() as u16, 0] }
}
}
#[cfg(feature="ascii")]
/// Requires the feature "ascii".
impl ToAsciiChar for Utf16Char {
#[inline]
fn to_ascii_char(self) -> Result<AsciiChar, ToAsciiCharError> {
// ToAsciiCHar is not implemented for u16 in ascii 0.9.0
if self.is_ascii() {self.units[0] as u8} else {255}.to_ascii_char()
}
#[inline]
unsafe fn to_ascii_char_unchecked(self) -> AsciiChar {
(self.units[0] as u8).to_ascii_char_unchecked()
}
}
/////////////////////////////////////////////////////////
//Genaral traits that cannot be derived to emulate char//
/////////////////////////////////////////////////////////
impl hash::Hash for Utf16Char {
fn hash<H : hash::Hasher>(&self, state: &mut H) {
self.to_char().hash(state);
}
}
impl fmt::Debug for Utf16Char {
fn fmt(&self, fmtr: &mut fmt::Formatter) -> fmt::Result {
fmt::Debug::fmt(&self.to_char(), fmtr)
}
}
impl fmt::Display for Utf16Char {
fn fmt(&self, fmtr: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(&Utf8Char::from(*self), fmtr)
}
}
// Cannot derive these impls because two-unit characters must always compare
// greater than one-unit ones.
impl PartialOrd for Utf16Char {
#[inline]
fn partial_cmp(&self, rhs: &Self) -> Option<Ordering> {
Some(self.cmp(rhs))
}
}
impl Ord for Utf16Char {
#[inline]
fn cmp(&self, rhs: &Self) -> Ordering {
// Shift the first unit by 0xd if surrogate, and 0 otherwise.
// This ensures surrogates are always greater than 0xffff, and
// that the second unit only affect the result when the first are equal.
// Multiplying by a constant factor isn't enough because that factor
// would have to be greater than 1023 and smaller than 5.5.
// This transformation is less complicated than combine_surrogates().
let lhs = (self.units[0] as u32, self.units[1] as u32);
let rhs = (rhs.units[0] as u32, rhs.units[1] as u32);
let lhs = (lhs.0 << (lhs.1 >> 12)) + lhs.1;
let rhs = (rhs.0 << (rhs.1 >> 12)) + rhs.1;
lhs.cmp(&rhs)
}
}
////////////////////////////////
//Comparisons with other types//
////////////////////////////////
impl PartialEq<char> for Utf16Char {
fn eq(&self, u32c: &char) -> bool {
*self == Utf16Char::from(*u32c)
}
}
impl PartialEq<Utf16Char> for char {
fn eq(&self, u16c: &Utf16Char) -> bool {
Utf16Char::from(*self) == *u16c
}
}
impl PartialOrd<char> for Utf16Char {
fn partial_cmp(&self, u32c: &char) -> Option<Ordering> {
self.partial_cmp(&Utf16Char::from(*u32c))
}
}
impl PartialOrd<Utf16Char> for char {
fn partial_cmp(&self, u16c: &Utf16Char) -> Option<Ordering> {
Utf16Char::from(*self).partial_cmp(u16c)
}
}
impl PartialEq<Utf8Char> for Utf16Char {
fn eq(&self, u8c: &Utf8Char) -> bool {
*self == Utf16Char::from(*u8c)
}
}
impl PartialOrd<Utf8Char> for Utf16Char {
fn partial_cmp(&self, u8c: &Utf8Char) -> Option<Ordering> {
self.partial_cmp(&Utf16Char::from(*u8c))
}
}
// The other direction is implemented in utf8_char.rs
/// Only considers the unit equal if the codepoint of the `Utf16Char` is not
/// made up of a surrogate pair.
///
/// There is no impl in the opposite direction, as this should only be used to
/// compare `Utf16Char`s against constants.
///
/// # Examples
///
/// ```
/// # use encode_unicode::Utf16Char;
/// assert!(Utf16Char::from('6') == b'6' as u16);
/// assert!(Utf16Char::from('\u{FFFF}') == 0xffff_u16);
/// assert!(Utf16Char::from_tuple((0xd876, Some(0xdef9))).unwrap() != 0xd876_u16);
/// ```
impl PartialEq<u16> for Utf16Char {
fn eq(&self, unit: &u16) -> bool {
self.units[0] == *unit && self.units[1] == 0
}
}
/// Only considers the byte equal if the codepoint of the `Utf16Char` is <= U+FF.
///
/// # Examples
///
/// ```
/// # use encode_unicode::Utf16Char;
/// assert!(Utf16Char::from('6') == b'6');
/// assert!(Utf16Char::from('\u{00FF}') == b'\xff');
/// assert!(Utf16Char::from('\u{0100}') != b'\0');
/// ```
impl PartialEq<u8> for Utf16Char {
fn eq(&self, byte: &u8) -> bool {
self.units[0] == *byte as u16
}
}
#[cfg(feature = "ascii")]
/// `Utf16Char`s that are not ASCII never compare equal.
impl PartialEq<AsciiChar> for Utf16Char {
#[inline]
fn eq(&self, ascii: &AsciiChar) -> bool {
self.units[0] == *ascii as u16
}
}
#[cfg(feature = "ascii")]
/// `Utf16Char`s that are not ASCII never compare equal.
impl PartialEq<Utf16Char> for AsciiChar {
#[inline]
fn eq(&self, u16c: &Utf16Char) -> bool {
*self as u16 == u16c.units[0]
}
}
#[cfg(feature = "ascii")]
/// `Utf16Char`s that are not ASCII always compare greater.
impl PartialOrd<AsciiChar> for Utf16Char {
#[inline]
fn partial_cmp(&self, ascii: &AsciiChar) -> Option<Ordering> {
self.units[0].partial_cmp(&(*ascii as u16))
}
}
#[cfg(feature = "ascii")]
/// `Utf16Char`s that are not ASCII always compare greater.
impl PartialOrd<Utf16Char> for AsciiChar {
#[inline]
fn partial_cmp(&self, u16c: &Utf16Char) -> Option<Ordering> {
(*self as u16).partial_cmp(&u16c.units[0])
}
}
///////////////////////////////////////////////////////
//pub impls that should be together for nicer rustdoc//
///////////////////////////////////////////////////////
impl Utf16Char {
/// Create an `Utf16Char` from the first codepoint in a string slice,
/// converting from UTF-8 to UTF-16.
///
/// The returned `usize` is the number of UTF-8 bytes used from the str,
/// and not the number of UTF-16 units.
///
/// Returns an error if the `str` is empty.
///
/// # Examples
///
/// ```
/// use encode_unicode::Utf16Char;
///
/// assert_eq!(Utf16Char::from_str_start("a"), Ok((Utf16Char::from('a'),1)));
/// assert_eq!(Utf16Char::from_str_start("ab"), Ok((Utf16Char::from('a'),1)));
/// assert_eq!(Utf16Char::from_str_start("🂠 "), Ok((Utf16Char::from('🂠'),4)));
/// assert_eq!(Utf16Char::from_str_start("é"), Ok((Utf16Char::from('e'),1)));// 'e'+u301 combining mark
/// assert!(Utf16Char::from_str_start("").is_err());
/// ```
pub fn from_str_start(s: &str) -> Result<(Self,usize), EmptyStrError> {
if s.is_empty() {
return Err(EmptyStrError);
}
let b = s.as_bytes();
// Read the last byte first to reduce the number of unnecesary length checks.
match b[0] {
0...127 => {// 1 byte => 1 unit
let unit = b[0] as u16;// 0b0000_0000_0xxx_xxxx
Ok((Utf16Char{ units: [unit, 0] }, 1))
},
0b1000_0000...0b1101_1111 => {// 2 bytes => 1 unit
let unit = (((b[1] & 0x3f) as u16) << 0) // 0b0000_0000_00xx_xxxx
| (((b[0] & 0x1f) as u16) << 6);// 0b0000_0xxx_xx00_0000
Ok((Utf16Char{ units: [unit, 0] }, 2))
},
0b1110_0000...0b1110_1111 => {// 3 bytes => 1 unit
let unit = (((b[2] & 0x3f) as u16) << 0) // 0b0000_0000_00xx_xxxx
| (((b[1] & 0x3f) as u16) << 6) // 0b0000_xxxx_xx00_0000
| (((b[0] & 0x0f) as u16) << 12);// 0bxxxx_0000_0000_0000
Ok((Utf16Char{ units: [unit, 0] }, 3))
},
_ => {// 4 bytes => 2 units
let second = 0xdc00 // 0b1101_1100_0000_0000
| (((b[3] & 0x3f) as u16) << 0) // 0b0000_0000_00xx_xxxx
| (((b[2] & 0x0f) as u16) << 6);// 0b0000_00xx_xx00_0000
let first = 0xd800-(0x01_00_00u32>>10) as u16// 0b1101_0111_1100_0000
+ (((b[2] & 0x30) as u16) >> 4) // 0b0000_0000_0000_00xx
+ (((b[1] & 0x3f) as u16) << 2) // 0b0000_0000_xxxx_xx00
+ (((b[0] & 0x07) as u16) << 8); // 0b0000_0xxx_0000_0000
Ok((Utf16Char{ units: [first, second] }, 4))
}
}
}
/// Validate and store the first UTF-16 codepoint in the slice.
/// Also return how many units were needed.
pub fn from_slice_start(src: &[u16]) -> Result<(Self,usize), InvalidUtf16Slice> {
char::from_utf16_slice_start(src).map(|(_,len)| {
let second = if len==2 {src[1]} else {0};
(Utf16Char{ units: [src[0], second] }, len)
})
}
/// Store the first UTF-16 codepoint of the slice.
///
/// # Safety
///
/// The slice must be non-empty and start with a valid UTF-16 codepoint.
/// The length of the slice is never checked.
pub unsafe fn from_slice_start_unchecked(src: &[u16]) -> (Self,usize) {
let first = *src.get_unchecked(0);
if first.is_utf16_leading_surrogate() {
(Utf16Char{ units: [first, *src.get_unchecked(1)] }, 2)
} else {
(Utf16Char{ units: [first, 0] }, 1)
}
}
/// Validate and store an UTF-16 array as returned from `char.to_utf16_array()`.
///
/// # Examples
///
/// ```
/// use encode_unicode::Utf16Char;
/// use encode_unicode::error::InvalidUtf16Array;
///
/// assert_eq!(Utf16Char::from_array(['x' as u16, 'y' as u16]), Ok(Utf16Char::from('x')));
/// assert_eq!(Utf16Char::from_array(['睷' as u16, 0]), Ok(Utf16Char::from('睷')));
/// assert_eq!(Utf16Char::from_array([0xda6f, 0xdcde]), Ok(Utf16Char::from('\u{abcde}')));
/// assert_eq!(Utf16Char::from_array([0xf111, 0xdbad]), Ok(Utf16Char::from('\u{f111}')));
/// assert_eq!(Utf16Char::from_array([0xdaaf, 0xdaaf]), Err(InvalidUtf16Array::SecondIsNotTrailingSurrogate));
/// assert_eq!(Utf16Char::from_array([0xdcac, 0x9000]), Err(InvalidUtf16Array::FirstIsTrailingSurrogate));
/// ```
pub fn from_array(units: [u16; 2]) -> Result<Self,InvalidUtf16Array> {
if (units[0] & 0xf8_00) != 0xd8_00 {
Ok(Utf16Char { units: [units[0], 0] })
} else if units[0] < 0xdc_00 && (units[1] & 0xfc_00) == 0xdc_00 {
Ok(Utf16Char { units: units })
} else if units[0] < 0xdc_00 {
Err(InvalidUtf16Array::SecondIsNotTrailingSurrogate)
} else {
Err(InvalidUtf16Array::FirstIsTrailingSurrogate)
}
}
/// Create an `Utf16Char` from an array as returned from `char.to_utf16_array()`.
///
/// # Safety
///
/// The units must form a valid codepoint, and the second unit must be 0
/// when a surrogate pair is not required.
/// Violating this can easily lead to undefined behavior, although unlike
/// `char` bad `Utf16Char`s simply existing is not immediately UB.
pub unsafe fn from_array_unchecked(units: [u16; 2]) -> Self {
Utf16Char { units: units }
}
/// Validate and store a UTF-16 pair as returned from `char.to_utf16_tuple()`.
pub fn from_tuple(utf16: (u16,Option<u16>)) -> Result<Self,InvalidUtf16Tuple> {
unsafe {char::from_utf16_tuple(utf16).map(|_|
Self::from_tuple_unchecked(utf16)
)}
}
/// Create an `Utf16Char` from a tuple as returned from `char.to_utf16_tuple()`.
///
/// # Safety
///
/// The units must form a valid codepoint with the second being 0 when a
/// surrogate pair is not required.
/// Violating this can easily lead to undefined behavior.
pub unsafe fn from_tuple_unchecked(utf16: (u16,Option<u16>)) -> Self {
Utf16Char { units: [utf16.0, utf16.1.unwrap_or(0)] }
}
/// Create an `Utf16Char` from a single unit.
///
/// Codepoints < '\u{1_0000}' (which fit in a `u16`) are part of the basic
/// multilingual plane unless they are reserved for surrogate pairs.
///
/// # Errors
///
/// Returns `NonBMPError` if the unit is in the range `0xd800..0xe000`
/// (which means that it's part of a surrogat pair)
///
/// # Examples
///
/// ```
/// # use encode_unicode::Utf16Char;
/// assert_eq!(Utf16Char::from_bmp(0x40).unwrap(), '@');
/// assert_eq!(Utf16Char::from_bmp('ø' as u16).unwrap(), 'ø');
/// assert!(Utf16Char::from_bmp(0xdddd).is_err());
/// ```
pub fn from_bmp(bmp_codepoint: u16) -> Result<Self,NonBMPError> {
if bmp_codepoint & 0xf800 != 0xd800 {
Ok(Utf16Char{ units: [bmp_codepoint, 0] })
} else {
Err(NonBMPError)
}
}
/// Create an `Utf16Char` from a single unit without checking that it's a
/// valid codepoint on its own.
///
/// # Safety
///
/// The unit must be less than 0xd800 or greater than 0xdfff.
/// In other words, not part of a surrogate pair.
/// Violating this can easily lead to undefined behavior.
#[inline]
pub unsafe fn from_bmp_unchecked(bmp_codepoint: u16) -> Self {
Utf16Char{ units: [bmp_codepoint, 0] }
}
/// Checks that the codepoint is in the basic multilingual plane.
///
/// # Examples
/// ```
/// # use encode_unicode::Utf16Char;
/// assert_eq!(Utf16Char::from('e').is_bmp(), true);
/// assert_eq!(Utf16Char::from('€').is_bmp(), true);
/// assert_eq!(Utf16Char::from('𝔼').is_bmp(), false);
/// ```
#[inline]
pub fn is_bmp(&self) -> bool {
self.units[1] == 0
}
/// The number of units this character is made up of.
///
/// Is either 1 or 2 and identical to `.as_char().len_utf16()`
/// or `.as_ref().len()`.
#[inline]
pub fn len(self) -> usize {
1 + (self.units[1] as usize >> 15)
}
// There is no `.is_emty()` because it would always return false.
/// Checks that the codepoint is an ASCII character.
#[inline]
pub fn is_ascii(&self) -> bool {
self.units[0] <= 127
}
/// Checks that two characters are an ASCII case-insensitive match.
///
/// Is equivalent to `a.to_ascii_lowercase() == b.to_ascii_lowercase()`.
#[cfg(feature="std")]
pub fn eq_ignore_ascii_case(&self, other: &Self) -> bool {
self.to_ascii_lowercase() == other.to_ascii_lowercase()
}
/// Converts the character to its ASCII upper case equivalent.
///
/// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',
/// but non-ASCII letters are unchanged.
#[cfg(feature="std")]
pub fn to_ascii_uppercase(&self) -> Self {
let n = self.units[0].wrapping_sub(b'a' as u16);
if n < 26 {Utf16Char{ units: [n+b'A' as u16, 0] }}
else {*self}
}
/// Converts the character to its ASCII lower case equivalent.
///
/// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',
/// but non-ASCII letters are unchanged.
#[cfg(feature="std")]
pub fn to_ascii_lowercase(&self) -> Self {
let n = self.units[0].wrapping_sub(b'A' as u16);
if n < 26 {Utf16Char{ units: [n+b'a' as u16, 0] }}
else {*self}
}
/// Converts the character 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.
#[cfg(feature="std")]
pub fn make_ascii_uppercase(&mut self) {
*self = self.to_ascii_uppercase()
}
/// Converts the character 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.
#[cfg(feature="std")]
pub fn make_ascii_lowercase(&mut self) {
*self = self.to_ascii_lowercase();
}
/// Convert from UTF-16 to UTF-32
pub fn to_char(self) -> char {
self.into()
}
/// Write the internal representation to a slice,
/// and then returns the number of `u16`s written.
///
/// # Panics
/// Will panic the buffer is too small;
/// You can get the required length from `.len()`,
/// but a buffer of length two is always large enough.
pub fn to_slice(self, dst: &mut[u16]) -> usize {
// Write the last unit first to avoid repeated length checks.
let extra = self.units[1] as usize >> 15;
match dst.get_mut(extra) {
Some(first) => *first = self.units[extra],
None => panic!("The provided buffer is too small.")
}
if extra != 0 {dst[0] = self.units[0];}
extra+1
}
/// Get the character represented as an array of two units.
///
/// The second `u16` is zero for codepoints that fit in one unit.
#[inline]
pub fn to_array(self) -> [u16;2] {
self.units
}
/// The second `u16` is used for surrogate pairs.
#[inline]
pub fn to_tuple(self) -> (u16,Option<u16>) {
(self.units[0], if self.units[1]==0 {None} else {Some(self.units[1])})
}
}