b4d4daf007
references. For collections whose keys are integers, we take both references and by-value.
1322 lines
43 KiB
Rust
1322 lines
43 KiB
Rust
// Copyright 2015 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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//! Implementation of [the WTF-8 encoding](https://simonsapin.github.io/wtf-8/).
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//!
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//! This library uses Rust’s type system to maintain
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//! [well-formedness](https://simonsapin.github.io/wtf-8/#well-formed),
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//! like the `String` and `&str` types do for UTF-8.
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//!
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//! Since [WTF-8 must not be used
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//! for interchange](https://simonsapin.github.io/wtf-8/#intended-audience),
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//! this library deliberately does not provide access to the underlying bytes
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//! of WTF-8 strings,
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//! nor can it decode WTF-8 from arbitrary bytes.
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//! WTF-8 strings can be obtained from UTF-8, UTF-16, or code points.
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// this module is imported from @SimonSapin's repo and has tons of dead code on
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// unix (it's mostly used on windows), so don't worry about dead code here.
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#![allow(dead_code)]
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use core::prelude::*;
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use core::char::{encode_utf8_raw, encode_utf16_raw};
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use core::str::{char_range_at_raw, next_code_point};
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use ascii::*;
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use borrow::Cow;
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use cmp;
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use fmt;
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use hash::{Hash, Hasher};
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use iter::{FromIterator, IntoIterator};
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use mem;
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use num::Int;
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use ops;
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use slice;
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use str;
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use string::String;
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use sys_common::AsInner;
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use unicode::str::{Utf16Item, utf16_items};
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use vec::Vec;
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const UTF8_REPLACEMENT_CHARACTER: &'static [u8] = b"\xEF\xBF\xBD";
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/// A Unicode code point: from U+0000 to U+10FFFF.
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///
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/// Compare with the `char` type,
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/// which represents a Unicode scalar value:
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/// a code point that is not a surrogate (U+D800 to U+DFFF).
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#[derive(Eq, PartialEq, Ord, PartialOrd, Clone, Copy)]
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pub struct CodePoint {
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value: u32
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}
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/// Format the code point as `U+` followed by four to six hexadecimal digits.
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/// Example: `U+1F4A9`
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impl fmt::Debug for CodePoint {
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#[inline]
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fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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write!(formatter, "U+{:04X}", self.value)
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}
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}
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impl CodePoint {
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/// Unsafely create a new `CodePoint` without checking the value.
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///
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/// Only use when `value` is known to be less than or equal to 0x10FFFF.
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#[inline]
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pub unsafe fn from_u32_unchecked(value: u32) -> CodePoint {
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CodePoint { value: value }
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}
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/// Create a new `CodePoint` if the value is a valid code point.
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///
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/// Return `None` if `value` is above 0x10FFFF.
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#[inline]
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pub fn from_u32(value: u32) -> Option<CodePoint> {
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match value {
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0 ... 0x10FFFF => Some(CodePoint { value: value }),
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_ => None
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}
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}
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/// Create a new `CodePoint` from a `char`.
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///
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/// Since all Unicode scalar values are code points, this always succeeds.
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#[inline]
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pub fn from_char(value: char) -> CodePoint {
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CodePoint { value: value as u32 }
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}
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/// Return the numeric value of the code point.
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#[inline]
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pub fn to_u32(&self) -> u32 {
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self.value
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}
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/// Optionally return a Unicode scalar value for the code point.
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///
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/// Return `None` if the code point is a surrogate (from U+D800 to U+DFFF).
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#[inline]
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pub fn to_char(&self) -> Option<char> {
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match self.value {
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0xD800 ... 0xDFFF => None,
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_ => Some(unsafe { mem::transmute(self.value) })
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}
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}
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/// Return a Unicode scalar value for the code point.
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///
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/// Return `'\u{FFFD}'` (the replacement character “<>”)
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/// if the code point is a surrogate (from U+D800 to U+DFFF).
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#[inline]
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pub fn to_char_lossy(&self) -> char {
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self.to_char().unwrap_or('\u{FFFD}')
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}
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}
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/// An owned, growable string of well-formed WTF-8 data.
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///
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/// Similar to `String`, but can additionally contain surrogate code points
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/// if they’re not in a surrogate pair.
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#[derive(Eq, PartialEq, Ord, PartialOrd, Clone)]
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pub struct Wtf8Buf {
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bytes: Vec<u8>
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}
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impl ops::Deref for Wtf8Buf {
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type Target = Wtf8;
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fn deref(&self) -> &Wtf8 {
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self.as_slice()
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}
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}
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/// Format the string with double quotes,
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/// and surrogates as `\u` followed by four hexadecimal digits.
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/// Example: `"a\u{D800}"` for a string with code points [U+0061, U+D800]
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impl fmt::Debug for Wtf8Buf {
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#[inline]
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fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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fmt::Debug::fmt(&**self, formatter)
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}
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}
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impl Wtf8Buf {
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/// Create an new, empty WTF-8 string.
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#[inline]
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pub fn new() -> Wtf8Buf {
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Wtf8Buf { bytes: Vec::new() }
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}
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/// Create an new, empty WTF-8 string with pre-allocated capacity for `n` bytes.
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#[inline]
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pub fn with_capacity(n: uint) -> Wtf8Buf {
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Wtf8Buf { bytes: Vec::with_capacity(n) }
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}
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/// Create a WTF-8 string from an UTF-8 `String`.
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///
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/// This takes ownership of the `String` and does not copy.
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///
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/// Since WTF-8 is a superset of UTF-8, this always succeeds.
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#[inline]
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pub fn from_string(string: String) -> Wtf8Buf {
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Wtf8Buf { bytes: string.into_bytes() }
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}
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/// Create a WTF-8 string from an UTF-8 `&str` slice.
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///
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/// This copies the content of the slice.
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///
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/// Since WTF-8 is a superset of UTF-8, this always succeeds.
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#[inline]
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pub fn from_str(str: &str) -> Wtf8Buf {
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Wtf8Buf { bytes: <[_]>::to_vec(str.as_bytes()) }
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}
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/// Create a WTF-8 string from a potentially ill-formed UTF-16 slice of 16-bit code units.
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///
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/// This is lossless: calling `.encode_wide()` on the resulting string
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/// will always return the original code units.
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pub fn from_wide(v: &[u16]) -> Wtf8Buf {
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let mut string = Wtf8Buf::with_capacity(v.len());
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for item in utf16_items(v) {
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match item {
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Utf16Item::ScalarValue(c) => string.push_char(c),
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Utf16Item::LoneSurrogate(s) => {
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// Surrogates are known to be in the code point range.
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let code_point = unsafe { CodePoint::from_u32_unchecked(s as u32) };
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// Skip the WTF-8 concatenation check,
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// surrogate pairs are already decoded by utf16_items
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string.push_code_point_unchecked(code_point)
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}
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}
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}
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string
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}
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/// Copied from String::push
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/// This does **not** include the WTF-8 concatenation check.
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fn push_code_point_unchecked(&mut self, code_point: CodePoint) {
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let cur_len = self.len();
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// This may use up to 4 bytes.
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self.reserve(4);
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unsafe {
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// Attempt to not use an intermediate buffer by just pushing bytes
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// directly onto this string.
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let slice = slice::from_raw_parts_mut(
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self.bytes.as_mut_ptr().offset(cur_len as int),
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4
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);
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let used = encode_utf8_raw(code_point.value, mem::transmute(slice))
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.unwrap_or(0);
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self.bytes.set_len(cur_len + used);
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}
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}
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#[inline]
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pub fn as_slice(&self) -> &Wtf8 {
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unsafe { mem::transmute(&*self.bytes) }
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}
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/// Reserves capacity for at least `additional` more bytes to be inserted
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/// in the given `Wtf8Buf`.
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/// The collection may reserve more space to avoid frequent reallocations.
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///
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/// # Panics
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///
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/// Panics if the new capacity overflows `uint`.
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#[inline]
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pub fn reserve(&mut self, additional: uint) {
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self.bytes.reserve(additional)
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}
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/// Returns the number of bytes that this string buffer can hold without reallocating.
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#[inline]
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pub fn capacity(&self) -> uint {
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self.bytes.capacity()
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}
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/// Append an UTF-8 slice at the end of the string.
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#[inline]
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pub fn push_str(&mut self, other: &str) {
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self.bytes.push_all(other.as_bytes())
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}
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/// Append a WTF-8 slice at the end of the string.
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///
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/// This replaces newly paired surrogates at the boundary
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/// with a supplementary code point,
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/// like concatenating ill-formed UTF-16 strings effectively would.
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#[inline]
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pub fn push_wtf8(&mut self, other: &Wtf8) {
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match ((&*self).final_lead_surrogate(), other.initial_trail_surrogate()) {
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// Replace newly paired surrogates by a supplementary code point.
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(Some(lead), Some(trail)) => {
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let len_without_lead_surrogate = self.len() - 3;
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self.bytes.truncate(len_without_lead_surrogate);
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let other_without_trail_surrogate = &other.bytes[3..];
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// 4 bytes for the supplementary code point
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self.bytes.reserve(4 + other_without_trail_surrogate.len());
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self.push_char(decode_surrogate_pair(lead, trail));
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self.bytes.push_all(other_without_trail_surrogate);
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}
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_ => self.bytes.push_all(&other.bytes)
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}
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}
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/// Append a Unicode scalar value at the end of the string.
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#[inline]
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pub fn push_char(&mut self, c: char) {
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self.push_code_point_unchecked(CodePoint::from_char(c))
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}
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/// Append a code point at the end of the string.
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///
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/// This replaces newly paired surrogates at the boundary
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/// with a supplementary code point,
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/// like concatenating ill-formed UTF-16 strings effectively would.
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#[inline]
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pub fn push(&mut self, code_point: CodePoint) {
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match code_point.to_u32() {
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trail @ 0xDC00...0xDFFF => {
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match (&*self).final_lead_surrogate() {
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Some(lead) => {
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let len_without_lead_surrogate = self.len() - 3;
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self.bytes.truncate(len_without_lead_surrogate);
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self.push_char(decode_surrogate_pair(lead, trail as u16));
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return
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}
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_ => {}
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}
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}
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_ => {}
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}
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// No newly paired surrogates at the boundary.
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self.push_code_point_unchecked(code_point)
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}
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/// Shortens a string to the specified length.
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///
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/// # Panics
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///
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/// Panics if `new_len` > current length,
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/// or if `new_len` is not a code point boundary.
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#[inline]
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pub fn truncate(&mut self, new_len: uint) {
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assert!(is_code_point_boundary(self, new_len));
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self.bytes.truncate(new_len)
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}
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/// Consume the WTF-8 string and try to convert it to UTF-8.
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///
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/// This does not copy the data.
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///
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/// If the contents are not well-formed UTF-8
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/// (that is, if the string contains surrogates),
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/// the original WTF-8 string is returned instead.
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pub fn into_string(self) -> Result<String, Wtf8Buf> {
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match self.next_surrogate(0) {
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None => Ok(unsafe { String::from_utf8_unchecked(self.bytes) }),
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Some(_) => Err(self),
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}
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}
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/// Consume the WTF-8 string and convert it lossily to UTF-8.
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///
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/// This does not copy the data (but may overwrite parts of it in place).
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///
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/// Surrogates are replaced with `"\u{FFFD}"` (the replacement character “<>”)
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pub fn into_string_lossy(mut self) -> String {
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let mut pos = 0;
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loop {
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match self.next_surrogate(pos) {
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Some((surrogate_pos, _)) => {
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pos = surrogate_pos + 3;
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slice::bytes::copy_memory(
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&mut self.bytes[surrogate_pos .. pos],
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UTF8_REPLACEMENT_CHARACTER
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);
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},
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None => return unsafe { String::from_utf8_unchecked(self.bytes) }
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}
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}
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}
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}
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/// Create a new WTF-8 string from an iterator of code points.
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///
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/// This replaces surrogate code point pairs with supplementary code points,
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/// like concatenating ill-formed UTF-16 strings effectively would.
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impl FromIterator<CodePoint> for Wtf8Buf {
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fn from_iter<T: IntoIterator<Item=CodePoint>>(iter: T) -> Wtf8Buf {
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let mut string = Wtf8Buf::new();
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string.extend(iter);
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string
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}
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}
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/// Append code points from an iterator to the string.
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///
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/// This replaces surrogate code point pairs with supplementary code points,
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/// like concatenating ill-formed UTF-16 strings effectively would.
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impl Extend<CodePoint> for Wtf8Buf {
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fn extend<T: IntoIterator<Item=CodePoint>>(&mut self, iterable: T) {
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let iterator = iterable.into_iter();
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let (low, _high) = iterator.size_hint();
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// Lower bound of one byte per code point (ASCII only)
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self.bytes.reserve(low);
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for code_point in iterator {
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self.push(code_point);
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}
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}
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}
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/// A borrowed slice of well-formed WTF-8 data.
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///
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/// Similar to `&str`, but can additionally contain surrogate code points
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/// if they’re not in a surrogate pair.
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pub struct Wtf8 {
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bytes: [u8]
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}
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impl AsInner<[u8]> for Wtf8 {
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fn as_inner(&self) -> &[u8] { &self.bytes }
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}
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// FIXME: https://github.com/rust-lang/rust/issues/18805
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impl PartialEq for Wtf8 {
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fn eq(&self, other: &Wtf8) -> bool { self.bytes.eq(&other.bytes) }
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}
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// FIXME: https://github.com/rust-lang/rust/issues/18805
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impl Eq for Wtf8 {}
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|
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// FIXME: https://github.com/rust-lang/rust/issues/18738
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impl PartialOrd for Wtf8 {
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#[inline]
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fn partial_cmp(&self, other: &Wtf8) -> Option<cmp::Ordering> {
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self.bytes.partial_cmp(&other.bytes)
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}
|
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#[inline]
|
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fn lt(&self, other: &Wtf8) -> bool { self.bytes.lt(&other.bytes) }
|
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#[inline]
|
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fn le(&self, other: &Wtf8) -> bool { self.bytes.le(&other.bytes) }
|
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#[inline]
|
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fn gt(&self, other: &Wtf8) -> bool { self.bytes.gt(&other.bytes) }
|
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#[inline]
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fn ge(&self, other: &Wtf8) -> bool { self.bytes.ge(&other.bytes) }
|
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}
|
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|
||
// FIXME: https://github.com/rust-lang/rust/issues/18738
|
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impl Ord for Wtf8 {
|
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#[inline]
|
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fn cmp(&self, other: &Wtf8) -> cmp::Ordering { self.bytes.cmp(&other.bytes) }
|
||
}
|
||
|
||
/// Format the slice with double quotes,
|
||
/// and surrogates as `\u` followed by four hexadecimal digits.
|
||
/// Example: `"a\u{D800}"` for a slice with code points [U+0061, U+D800]
|
||
impl fmt::Debug for Wtf8 {
|
||
fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
|
||
try!(formatter.write_str("\""));
|
||
let mut pos = 0;
|
||
loop {
|
||
match self.next_surrogate(pos) {
|
||
None => break,
|
||
Some((surrogate_pos, surrogate)) => {
|
||
try!(formatter.write_str(unsafe {
|
||
// the data in this slice is valid UTF-8, transmute to &str
|
||
mem::transmute(&self.bytes[pos .. surrogate_pos])
|
||
}));
|
||
try!(write!(formatter, "\\u{{{:X}}}", surrogate));
|
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pos = surrogate_pos + 3;
|
||
}
|
||
}
|
||
}
|
||
try!(formatter.write_str(unsafe {
|
||
// the data in this slice is valid UTF-8, transmute to &str
|
||
mem::transmute(&self.bytes[pos..])
|
||
}));
|
||
formatter.write_str("\"")
|
||
}
|
||
}
|
||
|
||
impl Wtf8 {
|
||
/// Create a WTF-8 slice from a UTF-8 `&str` slice.
|
||
///
|
||
/// Since WTF-8 is a superset of UTF-8, this always succeeds.
|
||
#[inline]
|
||
pub fn from_str(value: &str) -> &Wtf8 {
|
||
unsafe { mem::transmute(value.as_bytes()) }
|
||
}
|
||
|
||
/// Return the length, in WTF-8 bytes.
|
||
#[inline]
|
||
pub fn len(&self) -> uint {
|
||
self.bytes.len()
|
||
}
|
||
|
||
/// Return the code point at `position` if it is in the ASCII range,
|
||
/// or `b'\xFF' otherwise.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics if `position` is beyond the end of the string.
|
||
#[inline]
|
||
pub fn ascii_byte_at(&self, position: uint) -> u8 {
|
||
match self.bytes[position] {
|
||
ascii_byte @ 0x00 ... 0x7F => ascii_byte,
|
||
_ => 0xFF
|
||
}
|
||
}
|
||
|
||
/// Return the code point at `position`.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics if `position` is not at a code point boundary,
|
||
/// or is beyond the end of the string.
|
||
#[inline]
|
||
pub fn code_point_at(&self, position: uint) -> CodePoint {
|
||
let (code_point, _) = self.code_point_range_at(position);
|
||
code_point
|
||
}
|
||
|
||
/// Return the code point at `position`
|
||
/// and the position of the next code point.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics if `position` is not at a code point boundary,
|
||
/// or is beyond the end of the string.
|
||
#[inline]
|
||
pub fn code_point_range_at(&self, position: uint) -> (CodePoint, uint) {
|
||
let (c, n) = char_range_at_raw(&self.bytes, position);
|
||
(CodePoint { value: c }, n)
|
||
}
|
||
|
||
/// Return an iterator for the string’s code points.
|
||
#[inline]
|
||
pub fn code_points(&self) -> Wtf8CodePoints {
|
||
Wtf8CodePoints { bytes: self.bytes.iter() }
|
||
}
|
||
|
||
/// Try to convert the string to UTF-8 and return a `&str` slice.
|
||
///
|
||
/// Return `None` if the string contains surrogates.
|
||
///
|
||
/// This does not copy the data.
|
||
#[inline]
|
||
pub fn as_str(&self) -> Option<&str> {
|
||
// Well-formed WTF-8 is also well-formed UTF-8
|
||
// if and only if it contains no surrogate.
|
||
match self.next_surrogate(0) {
|
||
None => Some(unsafe { str::from_utf8_unchecked(&self.bytes) }),
|
||
Some(_) => None,
|
||
}
|
||
}
|
||
|
||
/// Lossily convert the string to UTF-8.
|
||
/// Return an UTF-8 `&str` slice if the contents are well-formed in UTF-8.
|
||
///
|
||
/// Surrogates are replaced with `"\u{FFFD}"` (the replacement character “<>”).
|
||
///
|
||
/// This only copies the data if necessary (if it contains any surrogate).
|
||
pub fn to_string_lossy(&self) -> Cow<str> {
|
||
let surrogate_pos = match self.next_surrogate(0) {
|
||
None => return Cow::Borrowed(unsafe { str::from_utf8_unchecked(&self.bytes) }),
|
||
Some((pos, _)) => pos,
|
||
};
|
||
let wtf8_bytes = &self.bytes;
|
||
let mut utf8_bytes = Vec::with_capacity(self.len());
|
||
utf8_bytes.push_all(&wtf8_bytes[..surrogate_pos]);
|
||
utf8_bytes.push_all(UTF8_REPLACEMENT_CHARACTER);
|
||
let mut pos = surrogate_pos + 3;
|
||
loop {
|
||
match self.next_surrogate(pos) {
|
||
Some((surrogate_pos, _)) => {
|
||
utf8_bytes.push_all(&wtf8_bytes[pos .. surrogate_pos]);
|
||
utf8_bytes.push_all(UTF8_REPLACEMENT_CHARACTER);
|
||
pos = surrogate_pos + 3;
|
||
},
|
||
None => {
|
||
utf8_bytes.push_all(&wtf8_bytes[pos..]);
|
||
return Cow::Owned(unsafe { String::from_utf8_unchecked(utf8_bytes) })
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Convert the WTF-8 string to potentially ill-formed UTF-16
|
||
/// and return an iterator of 16-bit code units.
|
||
///
|
||
/// This is lossless:
|
||
/// calling `Wtf8Buf::from_ill_formed_utf16` on the resulting code units
|
||
/// would always return the original WTF-8 string.
|
||
#[inline]
|
||
pub fn encode_wide(&self) -> EncodeWide {
|
||
EncodeWide { code_points: self.code_points(), extra: 0 }
|
||
}
|
||
|
||
#[inline]
|
||
fn next_surrogate(&self, mut pos: uint) -> Option<(uint, u16)> {
|
||
let mut iter = self.bytes[pos..].iter();
|
||
loop {
|
||
let b = match iter.next() {
|
||
None => return None,
|
||
Some(&b) => b,
|
||
};
|
||
if b < 0x80 {
|
||
pos += 1;
|
||
} else if b < 0xE0 {
|
||
iter.next();
|
||
pos += 2;
|
||
} else if b == 0xED {
|
||
match (iter.next(), iter.next()) {
|
||
(Some(&b2), Some(&b3)) if b2 >= 0xA0 => {
|
||
return Some((pos, decode_surrogate(b2, b3)))
|
||
}
|
||
_ => pos += 3
|
||
}
|
||
} else if b < 0xF0 {
|
||
iter.next();
|
||
iter.next();
|
||
pos += 3;
|
||
} else {
|
||
iter.next();
|
||
iter.next();
|
||
iter.next();
|
||
pos += 4;
|
||
}
|
||
}
|
||
}
|
||
|
||
#[inline]
|
||
fn final_lead_surrogate(&self) -> Option<u16> {
|
||
let len = self.len();
|
||
if len < 3 {
|
||
return None
|
||
}
|
||
match &self.bytes[(len - 3)..] {
|
||
[0xED, b2 @ 0xA0...0xAF, b3] => Some(decode_surrogate(b2, b3)),
|
||
_ => None
|
||
}
|
||
}
|
||
|
||
#[inline]
|
||
fn initial_trail_surrogate(&self) -> Option<u16> {
|
||
let len = self.len();
|
||
if len < 3 {
|
||
return None
|
||
}
|
||
match &self.bytes[..3] {
|
||
[0xED, b2 @ 0xB0...0xBF, b3] => Some(decode_surrogate(b2, b3)),
|
||
_ => None
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
/// Return a slice of the given string for the byte range [`begin`..`end`).
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics when `begin` and `end` do not point to code point boundaries,
|
||
/// or point beyond the end of the string.
|
||
#[cfg(stage0)]
|
||
impl ops::Index<ops::Range<usize>> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, range: &ops::Range<usize>) -> &Wtf8 {
|
||
// is_code_point_boundary checks that the index is in [0, .len()]
|
||
if range.start <= range.end &&
|
||
is_code_point_boundary(self, range.start) &&
|
||
is_code_point_boundary(self, range.end) {
|
||
unsafe { slice_unchecked(self, range.start, range.end) }
|
||
} else {
|
||
slice_error_fail(self, range.start, range.end)
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Return a slice of the given string for the byte range [`begin`..`end`).
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics when `begin` and `end` do not point to code point boundaries,
|
||
/// or point beyond the end of the string.
|
||
#[cfg(not(stage0))]
|
||
impl ops::Index<ops::Range<usize>> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, range: ops::Range<usize>) -> &Wtf8 {
|
||
// is_code_point_boundary checks that the index is in [0, .len()]
|
||
if range.start <= range.end &&
|
||
is_code_point_boundary(self, range.start) &&
|
||
is_code_point_boundary(self, range.end) {
|
||
unsafe { slice_unchecked(self, range.start, range.end) }
|
||
} else {
|
||
slice_error_fail(self, range.start, range.end)
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Return a slice of the given string from byte `begin` to its end.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics when `begin` is not at a code point boundary,
|
||
/// or is beyond the end of the string.
|
||
#[cfg(stage0)]
|
||
impl ops::Index<ops::RangeFrom<usize>> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, range: &ops::RangeFrom<usize>) -> &Wtf8 {
|
||
// is_code_point_boundary checks that the index is in [0, .len()]
|
||
if is_code_point_boundary(self, range.start) {
|
||
unsafe { slice_unchecked(self, range.start, self.len()) }
|
||
} else {
|
||
slice_error_fail(self, range.start, self.len())
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Return a slice of the given string from byte `begin` to its end.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics when `begin` is not at a code point boundary,
|
||
/// or is beyond the end of the string.
|
||
#[cfg(not(stage0))]
|
||
impl ops::Index<ops::RangeFrom<usize>> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, range: ops::RangeFrom<usize>) -> &Wtf8 {
|
||
// is_code_point_boundary checks that the index is in [0, .len()]
|
||
if is_code_point_boundary(self, range.start) {
|
||
unsafe { slice_unchecked(self, range.start, self.len()) }
|
||
} else {
|
||
slice_error_fail(self, range.start, self.len())
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Return a slice of the given string from its beginning to byte `end`.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics when `end` is not at a code point boundary,
|
||
/// or is beyond the end of the string.
|
||
#[cfg(stage0)]
|
||
impl ops::Index<ops::RangeTo<usize>> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, range: &ops::RangeTo<usize>) -> &Wtf8 {
|
||
// is_code_point_boundary checks that the index is in [0, .len()]
|
||
if is_code_point_boundary(self, range.end) {
|
||
unsafe { slice_unchecked(self, 0, range.end) }
|
||
} else {
|
||
slice_error_fail(self, 0, range.end)
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Return a slice of the given string from its beginning to byte `end`.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics when `end` is not at a code point boundary,
|
||
/// or is beyond the end of the string.
|
||
#[cfg(not(stage0))]
|
||
impl ops::Index<ops::RangeTo<usize>> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, range: ops::RangeTo<usize>) -> &Wtf8 {
|
||
// is_code_point_boundary checks that the index is in [0, .len()]
|
||
if is_code_point_boundary(self, range.end) {
|
||
unsafe { slice_unchecked(self, 0, range.end) }
|
||
} else {
|
||
slice_error_fail(self, 0, range.end)
|
||
}
|
||
}
|
||
}
|
||
|
||
#[cfg(stage0)]
|
||
impl ops::Index<ops::RangeFull> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, _range: &ops::RangeFull) -> &Wtf8 {
|
||
self
|
||
}
|
||
}
|
||
|
||
#[cfg(not(stage0))]
|
||
impl ops::Index<ops::RangeFull> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, _range: ops::RangeFull) -> &Wtf8 {
|
||
self
|
||
}
|
||
}
|
||
|
||
#[inline]
|
||
fn decode_surrogate(second_byte: u8, third_byte: u8) -> u16 {
|
||
// The first byte is assumed to be 0xED
|
||
0xD800 | (second_byte as u16 & 0x3F) << 6 | third_byte as u16 & 0x3F
|
||
}
|
||
|
||
#[inline]
|
||
fn decode_surrogate_pair(lead: u16, trail: u16) -> char {
|
||
let code_point = 0x10000 + ((((lead - 0xD800) as u32) << 10) | (trail - 0xDC00) as u32);
|
||
unsafe { mem::transmute(code_point) }
|
||
}
|
||
|
||
/// Copied from core::str::StrPrelude::is_char_boundary
|
||
#[inline]
|
||
pub fn is_code_point_boundary(slice: &Wtf8, index: uint) -> bool {
|
||
if index == slice.len() { return true; }
|
||
match slice.bytes.get(index) {
|
||
None => false,
|
||
Some(&b) => b < 128 || b >= 192,
|
||
}
|
||
}
|
||
|
||
/// Copied from core::str::raw::slice_unchecked
|
||
#[inline]
|
||
pub unsafe fn slice_unchecked(s: &Wtf8, begin: uint, end: uint) -> &Wtf8 {
|
||
// memory layout of an &[u8] and &Wtf8 are the same
|
||
mem::transmute(slice::from_raw_parts(
|
||
s.bytes.as_ptr().offset(begin as int),
|
||
end - begin
|
||
))
|
||
}
|
||
|
||
/// Copied from core::str::raw::slice_error_fail
|
||
#[inline(never)]
|
||
pub fn slice_error_fail(s: &Wtf8, begin: uint, end: uint) -> ! {
|
||
assert!(begin <= end);
|
||
panic!("index {} and/or {} in `{:?}` do not lie on character boundary",
|
||
begin, end, s);
|
||
}
|
||
|
||
/// Iterator for the code points of a WTF-8 string.
|
||
///
|
||
/// Created with the method `.code_points()`.
|
||
#[derive(Clone)]
|
||
pub struct Wtf8CodePoints<'a> {
|
||
bytes: slice::Iter<'a, u8>
|
||
}
|
||
|
||
impl<'a> Iterator for Wtf8CodePoints<'a> {
|
||
type Item = CodePoint;
|
||
|
||
#[inline]
|
||
fn next(&mut self) -> Option<CodePoint> {
|
||
next_code_point(&mut self.bytes).map(|c| CodePoint { value: c })
|
||
}
|
||
|
||
#[inline]
|
||
fn size_hint(&self) -> (uint, Option<uint>) {
|
||
let (len, _) = self.bytes.size_hint();
|
||
(len.saturating_add(3) / 4, Some(len))
|
||
}
|
||
}
|
||
|
||
#[derive(Clone)]
|
||
pub struct EncodeWide<'a> {
|
||
code_points: Wtf8CodePoints<'a>,
|
||
extra: u16
|
||
}
|
||
|
||
// Copied from libunicode/u_str.rs
|
||
impl<'a> Iterator for EncodeWide<'a> {
|
||
type Item = u16;
|
||
|
||
#[inline]
|
||
fn next(&mut self) -> Option<u16> {
|
||
if self.extra != 0 {
|
||
let tmp = self.extra;
|
||
self.extra = 0;
|
||
return Some(tmp);
|
||
}
|
||
|
||
let mut buf = [0; 2];
|
||
self.code_points.next().map(|code_point| {
|
||
let n = encode_utf16_raw(code_point.value, &mut buf)
|
||
.unwrap_or(0);
|
||
if n == 2 { self.extra = buf[1]; }
|
||
buf[0]
|
||
})
|
||
}
|
||
|
||
#[inline]
|
||
fn size_hint(&self) -> (uint, Option<uint>) {
|
||
let (low, high) = self.code_points.size_hint();
|
||
// every code point gets either one u16 or two u16,
|
||
// so this iterator is between 1 or 2 times as
|
||
// long as the underlying iterator.
|
||
(low, high.and_then(|n| n.checked_mul(2)))
|
||
}
|
||
}
|
||
|
||
impl Hash for CodePoint {
|
||
#[inline]
|
||
fn hash<H: Hasher>(&self, state: &mut H) {
|
||
self.value.hash(state)
|
||
}
|
||
}
|
||
|
||
impl Hash for Wtf8Buf {
|
||
#[inline]
|
||
fn hash<H: Hasher>(&self, state: &mut H) {
|
||
state.write(&self.bytes);
|
||
0xfeu8.hash(state)
|
||
}
|
||
}
|
||
|
||
impl Hash for Wtf8 {
|
||
#[inline]
|
||
fn hash<H: Hasher>(&self, state: &mut H) {
|
||
state.write(&self.bytes);
|
||
0xfeu8.hash(state)
|
||
}
|
||
}
|
||
|
||
impl AsciiExt for Wtf8 {
|
||
type Owned = Wtf8Buf;
|
||
|
||
fn is_ascii(&self) -> bool {
|
||
self.bytes.is_ascii()
|
||
}
|
||
fn to_ascii_uppercase(&self) -> Wtf8Buf {
|
||
Wtf8Buf { bytes: self.bytes.to_ascii_uppercase() }
|
||
}
|
||
fn to_ascii_lowercase(&self) -> Wtf8Buf {
|
||
Wtf8Buf { bytes: self.bytes.to_ascii_lowercase() }
|
||
}
|
||
fn eq_ignore_ascii_case(&self, other: &Wtf8) -> bool {
|
||
self.bytes.eq_ignore_ascii_case(&other.bytes)
|
||
}
|
||
|
||
fn make_ascii_uppercase(&mut self) { self.bytes.make_ascii_uppercase() }
|
||
fn make_ascii_lowercase(&mut self) { self.bytes.make_ascii_lowercase() }
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod tests {
|
||
use prelude::v1::*;
|
||
use borrow::Cow;
|
||
use super::*;
|
||
use mem::transmute;
|
||
|
||
#[test]
|
||
fn code_point_from_u32() {
|
||
assert!(CodePoint::from_u32(0).is_some());
|
||
assert!(CodePoint::from_u32(0xD800).is_some());
|
||
assert!(CodePoint::from_u32(0x10FFFF).is_some());
|
||
assert!(CodePoint::from_u32(0x110000).is_none());
|
||
}
|
||
|
||
#[test]
|
||
fn code_point_to_u32() {
|
||
fn c(value: u32) -> CodePoint { CodePoint::from_u32(value).unwrap() }
|
||
assert_eq!(c(0).to_u32(), 0);
|
||
assert_eq!(c(0xD800).to_u32(), 0xD800);
|
||
assert_eq!(c(0x10FFFF).to_u32(), 0x10FFFF);
|
||
}
|
||
|
||
#[test]
|
||
fn code_point_from_char() {
|
||
assert_eq!(CodePoint::from_char('a').to_u32(), 0x61);
|
||
assert_eq!(CodePoint::from_char('💩').to_u32(), 0x1F4A9);
|
||
}
|
||
|
||
#[test]
|
||
fn code_point_to_string() {
|
||
assert_eq!(format!("{:?}", CodePoint::from_char('a')), "U+0061");
|
||
assert_eq!(format!("{:?}", CodePoint::from_char('💩')), "U+1F4A9");
|
||
}
|
||
|
||
#[test]
|
||
fn code_point_to_char() {
|
||
fn c(value: u32) -> CodePoint { CodePoint::from_u32(value).unwrap() }
|
||
assert_eq!(c(0x61).to_char(), Some('a'));
|
||
assert_eq!(c(0x1F4A9).to_char(), Some('💩'));
|
||
assert_eq!(c(0xD800).to_char(), None);
|
||
}
|
||
|
||
#[test]
|
||
fn code_point_to_char_lossy() {
|
||
fn c(value: u32) -> CodePoint { CodePoint::from_u32(value).unwrap() }
|
||
assert_eq!(c(0x61).to_char_lossy(), 'a');
|
||
assert_eq!(c(0x1F4A9).to_char_lossy(), '💩');
|
||
assert_eq!(c(0xD800).to_char_lossy(), '\u{FFFD}');
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_new() {
|
||
assert_eq!(Wtf8Buf::new().bytes, b"");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_from_str() {
|
||
assert_eq!(Wtf8Buf::from_str("").bytes, b"");
|
||
assert_eq!(Wtf8Buf::from_str("aé 💩").bytes,
|
||
b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_from_string() {
|
||
assert_eq!(Wtf8Buf::from_string(String::from_str("")).bytes, b"");
|
||
assert_eq!(Wtf8Buf::from_string(String::from_str("aé 💩")).bytes,
|
||
b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_from_wide() {
|
||
assert_eq!(Wtf8Buf::from_wide(&[]).bytes, b"");
|
||
assert_eq!(Wtf8Buf::from_wide(
|
||
&[0x61, 0xE9, 0x20, 0xD83D, 0xD83D, 0xDCA9]).bytes,
|
||
b"a\xC3\xA9 \xED\xA0\xBD\xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_push_str() {
|
||
let mut string = Wtf8Buf::new();
|
||
assert_eq!(string.bytes, b"");
|
||
string.push_str("aé 💩");
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_push_char() {
|
||
let mut string = Wtf8Buf::from_str("aé ");
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 ");
|
||
string.push_char('💩');
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_push() {
|
||
let mut string = Wtf8Buf::from_str("aé ");
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 ");
|
||
string.push(CodePoint::from_char('💩'));
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
|
||
fn c(value: u32) -> CodePoint { CodePoint::from_u32(value).unwrap() }
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xD83D)); // lead
|
||
string.push(c(0xDCA9)); // trail
|
||
assert_eq!(string.bytes, b"\xF0\x9F\x92\xA9"); // Magic!
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xD83D)); // lead
|
||
string.push(c(0x20)); // not surrogate
|
||
string.push(c(0xDCA9)); // trail
|
||
assert_eq!(string.bytes, b"\xED\xA0\xBD \xED\xB2\xA9");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xD800)); // lead
|
||
string.push(c(0xDBFF)); // lead
|
||
assert_eq!(string.bytes, b"\xED\xA0\x80\xED\xAF\xBF");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xD800)); // lead
|
||
string.push(c(0xE000)); // not surrogate
|
||
assert_eq!(string.bytes, b"\xED\xA0\x80\xEE\x80\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xD7FF)); // not surrogate
|
||
string.push(c(0xDC00)); // trail
|
||
assert_eq!(string.bytes, b"\xED\x9F\xBF\xED\xB0\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0x61)); // not surrogate, < 3 bytes
|
||
string.push(c(0xDC00)); // trail
|
||
assert_eq!(string.bytes, b"\x61\xED\xB0\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xDC00)); // trail
|
||
assert_eq!(string.bytes, b"\xED\xB0\x80");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_push_wtf8() {
|
||
let mut string = Wtf8Buf::from_str("aé");
|
||
assert_eq!(string.bytes, b"a\xC3\xA9");
|
||
string.push_wtf8(Wtf8::from_str(" 💩"));
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
|
||
fn w(value: &[u8]) -> &Wtf8 { unsafe { transmute(value) } }
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\xA0\xBD")); // lead
|
||
string.push_wtf8(w(b"\xED\xB2\xA9")); // trail
|
||
assert_eq!(string.bytes, b"\xF0\x9F\x92\xA9"); // Magic!
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\xA0\xBD")); // lead
|
||
string.push_wtf8(w(b" ")); // not surrogate
|
||
string.push_wtf8(w(b"\xED\xB2\xA9")); // trail
|
||
assert_eq!(string.bytes, b"\xED\xA0\xBD \xED\xB2\xA9");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\xA0\x80")); // lead
|
||
string.push_wtf8(w(b"\xED\xAF\xBF")); // lead
|
||
assert_eq!(string.bytes, b"\xED\xA0\x80\xED\xAF\xBF");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\xA0\x80")); // lead
|
||
string.push_wtf8(w(b"\xEE\x80\x80")); // not surrogate
|
||
assert_eq!(string.bytes, b"\xED\xA0\x80\xEE\x80\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\x9F\xBF")); // not surrogate
|
||
string.push_wtf8(w(b"\xED\xB0\x80")); // trail
|
||
assert_eq!(string.bytes, b"\xED\x9F\xBF\xED\xB0\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"a")); // not surrogate, < 3 bytes
|
||
string.push_wtf8(w(b"\xED\xB0\x80")); // trail
|
||
assert_eq!(string.bytes, b"\x61\xED\xB0\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\xB0\x80")); // trail
|
||
assert_eq!(string.bytes, b"\xED\xB0\x80");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_truncate() {
|
||
let mut string = Wtf8Buf::from_str("aé");
|
||
string.truncate(1);
|
||
assert_eq!(string.bytes, b"a");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn wtf8buf_truncate_fail_code_point_boundary() {
|
||
let mut string = Wtf8Buf::from_str("aé");
|
||
string.truncate(2);
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn wtf8buf_truncate_fail_longer() {
|
||
let mut string = Wtf8Buf::from_str("aé");
|
||
string.truncate(4);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_into_string() {
|
||
let mut string = Wtf8Buf::from_str("aé 💩");
|
||
assert_eq!(string.clone().into_string(), Ok(String::from_str("aé 💩")));
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
assert_eq!(string.clone().into_string(), Err(string));
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_into_string_lossy() {
|
||
let mut string = Wtf8Buf::from_str("aé 💩");
|
||
assert_eq!(string.clone().into_string_lossy(), String::from_str("aé 💩"));
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
assert_eq!(string.clone().into_string_lossy(), String::from_str("aé 💩<>"));
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_from_iterator() {
|
||
fn f(values: &[u32]) -> Wtf8Buf {
|
||
values.iter().map(|&c| CodePoint::from_u32(c).unwrap()).collect::<Wtf8Buf>()
|
||
};
|
||
assert_eq!(f(&[0x61, 0xE9, 0x20, 0x1F4A9]).bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
|
||
assert_eq!(f(&[0xD83D, 0xDCA9]).bytes, b"\xF0\x9F\x92\xA9"); // Magic!
|
||
assert_eq!(f(&[0xD83D, 0x20, 0xDCA9]).bytes, b"\xED\xA0\xBD \xED\xB2\xA9");
|
||
assert_eq!(f(&[0xD800, 0xDBFF]).bytes, b"\xED\xA0\x80\xED\xAF\xBF");
|
||
assert_eq!(f(&[0xD800, 0xE000]).bytes, b"\xED\xA0\x80\xEE\x80\x80");
|
||
assert_eq!(f(&[0xD7FF, 0xDC00]).bytes, b"\xED\x9F\xBF\xED\xB0\x80");
|
||
assert_eq!(f(&[0x61, 0xDC00]).bytes, b"\x61\xED\xB0\x80");
|
||
assert_eq!(f(&[0xDC00]).bytes, b"\xED\xB0\x80");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_extend() {
|
||
fn e(initial: &[u32], extended: &[u32]) -> Wtf8Buf {
|
||
fn c(value: &u32) -> CodePoint { CodePoint::from_u32(*value).unwrap() }
|
||
let mut string = initial.iter().map(c).collect::<Wtf8Buf>();
|
||
string.extend(extended.iter().map(c));
|
||
string
|
||
};
|
||
|
||
assert_eq!(e(&[0x61, 0xE9], &[0x20, 0x1F4A9]).bytes,
|
||
b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
|
||
assert_eq!(e(&[0xD83D], &[0xDCA9]).bytes, b"\xF0\x9F\x92\xA9"); // Magic!
|
||
assert_eq!(e(&[0xD83D, 0x20], &[0xDCA9]).bytes, b"\xED\xA0\xBD \xED\xB2\xA9");
|
||
assert_eq!(e(&[0xD800], &[0xDBFF]).bytes, b"\xED\xA0\x80\xED\xAF\xBF");
|
||
assert_eq!(e(&[0xD800], &[0xE000]).bytes, b"\xED\xA0\x80\xEE\x80\x80");
|
||
assert_eq!(e(&[0xD7FF], &[0xDC00]).bytes, b"\xED\x9F\xBF\xED\xB0\x80");
|
||
assert_eq!(e(&[0x61], &[0xDC00]).bytes, b"\x61\xED\xB0\x80");
|
||
assert_eq!(e(&[], &[0xDC00]).bytes, b"\xED\xB0\x80");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_show() {
|
||
let mut string = Wtf8Buf::from_str("aé 💩");
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
assert_eq!(format!("{:?}", string), r#""aé 💩\u{D800}""#);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_as_slice() {
|
||
assert_eq!(Wtf8Buf::from_str("aé").as_slice(), Wtf8::from_str("aé"));
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_show() {
|
||
let mut string = Wtf8Buf::from_str("aé 💩");
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
assert_eq!(format!("{:?}", string), r#""aé 💩\u{D800}""#);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_from_str() {
|
||
assert_eq!(&Wtf8::from_str("").bytes, b"");
|
||
assert_eq!(&Wtf8::from_str("aé 💩").bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_len() {
|
||
assert_eq!(Wtf8::from_str("").len(), 0);
|
||
assert_eq!(Wtf8::from_str("aé 💩").len(), 8);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_slice() {
|
||
assert_eq!(&Wtf8::from_str("aé 💩")[1.. 4].bytes, b"\xC3\xA9 ");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn wtf8_slice_not_code_point_boundary() {
|
||
&Wtf8::from_str("aé 💩")[2.. 4];
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_slice_from() {
|
||
assert_eq!(&Wtf8::from_str("aé 💩")[1..].bytes, b"\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn wtf8_slice_from_not_code_point_boundary() {
|
||
&Wtf8::from_str("aé 💩")[2..];
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_slice_to() {
|
||
assert_eq!(&Wtf8::from_str("aé 💩")[..4].bytes, b"a\xC3\xA9 ");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn wtf8_slice_to_not_code_point_boundary() {
|
||
&Wtf8::from_str("aé 💩")[5..];
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_ascii_byte_at() {
|
||
let slice = Wtf8::from_str("aé 💩");
|
||
assert_eq!(slice.ascii_byte_at(0), b'a');
|
||
assert_eq!(slice.ascii_byte_at(1), b'\xFF');
|
||
assert_eq!(slice.ascii_byte_at(2), b'\xFF');
|
||
assert_eq!(slice.ascii_byte_at(3), b' ');
|
||
assert_eq!(slice.ascii_byte_at(4), b'\xFF');
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_code_point_at() {
|
||
let mut string = Wtf8Buf::from_str("aé ");
|
||
string.push(CodePoint::from_u32(0xD83D).unwrap());
|
||
string.push_char('💩');
|
||
assert_eq!(string.code_point_at(0), CodePoint::from_char('a'));
|
||
assert_eq!(string.code_point_at(1), CodePoint::from_char('é'));
|
||
assert_eq!(string.code_point_at(3), CodePoint::from_char(' '));
|
||
assert_eq!(string.code_point_at(4), CodePoint::from_u32(0xD83D).unwrap());
|
||
assert_eq!(string.code_point_at(7), CodePoint::from_char('💩'));
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_code_point_range_at() {
|
||
let mut string = Wtf8Buf::from_str("aé ");
|
||
string.push(CodePoint::from_u32(0xD83D).unwrap());
|
||
string.push_char('💩');
|
||
assert_eq!(string.code_point_range_at(0), (CodePoint::from_char('a'), 1));
|
||
assert_eq!(string.code_point_range_at(1), (CodePoint::from_char('é'), 3));
|
||
assert_eq!(string.code_point_range_at(3), (CodePoint::from_char(' '), 4));
|
||
assert_eq!(string.code_point_range_at(4), (CodePoint::from_u32(0xD83D).unwrap(), 7));
|
||
assert_eq!(string.code_point_range_at(7), (CodePoint::from_char('💩'), 11));
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_code_points() {
|
||
fn c(value: u32) -> CodePoint { CodePoint::from_u32(value).unwrap() }
|
||
fn cp(string: &Wtf8Buf) -> Vec<Option<char>> {
|
||
string.code_points().map(|c| c.to_char()).collect::<Vec<_>>()
|
||
}
|
||
let mut string = Wtf8Buf::from_str("é ");
|
||
assert_eq!(cp(&string), [Some('é'), Some(' ')]);
|
||
string.push(c(0xD83D));
|
||
assert_eq!(cp(&string), [Some('é'), Some(' '), None]);
|
||
string.push(c(0xDCA9));
|
||
assert_eq!(cp(&string), [Some('é'), Some(' '), Some('💩')]);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_as_str() {
|
||
assert_eq!(Wtf8::from_str("").as_str(), Some(""));
|
||
assert_eq!(Wtf8::from_str("aé 💩").as_str(), Some("aé 💩"));
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
assert_eq!(string.as_str(), None);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_to_string_lossy() {
|
||
assert_eq!(Wtf8::from_str("").to_string_lossy(), Cow::Borrowed(""));
|
||
assert_eq!(Wtf8::from_str("aé 💩").to_string_lossy(), Cow::Borrowed("aé 💩"));
|
||
let mut string = Wtf8Buf::from_str("aé 💩");
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
let expected: Cow<str> = Cow::Owned(String::from_str("aé 💩<>"));
|
||
assert_eq!(string.to_string_lossy(), expected);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_encode_wide() {
|
||
let mut string = Wtf8Buf::from_str("aé ");
|
||
string.push(CodePoint::from_u32(0xD83D).unwrap());
|
||
string.push_char('💩');
|
||
assert_eq!(string.encode_wide().collect::<Vec<_>>(),
|
||
vec![0x61, 0xE9, 0x20, 0xD83D, 0xD83D, 0xDCA9]);
|
||
}
|
||
}
|