183 lines
6.7 KiB
Rust
183 lines
6.7 KiB
Rust
/* Copyright 2018 The encode_unicode Developers
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*
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* Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
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* http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
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* http://opensource.org/licenses/MIT>, at your option. This file may not be
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* copied, modified, or distributed except according to those terms.
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*/
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//! Iterator tests
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#![cfg(feature="std")]
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extern crate encode_unicode;
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use encode_unicode::{IterExt, SliceExt, CharExt};
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use encode_unicode::iterator::Utf8CharSplitter;
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use encode_unicode::error::InvalidUtf8Slice::*;
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use encode_unicode::error::InvalidUtf8::*;
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use encode_unicode::error::InvalidUtf8FirstByte::*;
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use encode_unicode::error::InvalidCodepoint::*;
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use encode_unicode::error::Utf16PairError::*;
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use std::io::Read;
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use std::cmp::min;
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#[test] fn utf8charmerger() {
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let slice = b"\xf0\xa1\x92X\xcc\xbb";
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let mut iter = slice.iter().to_utf8chars();
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assert_eq!(iter.size_hint(), (1, Some(6)));
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assert_eq!(format!("{:?}", &iter),
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format!("Utf8CharMerger {{ buffered: [], inner: {:?} }}", slice.iter()));
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assert_eq!(iter.next(), Some(Err(Utf8(NotAContinuationByte(3)))));
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assert_eq!(iter.size_hint(), (0, Some(5)));
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assert_eq!(
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format!("{:?}", &iter),
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format!("Utf8CharMerger {{ buffered: [161, 146, 88], inner: {:?} }}", slice[4..].iter())
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);
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assert_eq!(iter.next(), Some(Err(Utf8(FirstByte(ContinuationByte)))));
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assert_eq!(iter.into_inner().next(), Some(&b'\xcc'));
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}
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#[test] fn utf8chardecoder() {
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let slice = b"\xf4\xbf\x80\x80XY\xcc\xbbZ_";
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let mut iter = slice.utf8char_indices();
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assert_eq!(iter.size_hint(), (2, Some(10)));
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assert_eq!(
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format!("{:?}", &iter),
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format!("Utf8CharDecoder {{ bytes[0..]: {:?} }}", &slice)
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);
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assert_eq!(iter.next(), Some((0, Err(Codepoint(TooHigh)), 1)));
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assert_eq!(
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format!("{:?}", &iter),
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format!("Utf8CharDecoder {{ bytes[1..]: {:?} }}", &slice[1..])
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);
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assert_eq!(iter.size_hint(), (2, Some(9)));
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assert_eq!(iter.count(), 8);
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}
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#[test] fn utf16charmerger() {
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let slice = [0xd800, 'x' as u16, 0xd900, 0xdfff, 'λ' as u16];
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let mut iter = slice.iter().to_utf16chars();
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assert_eq!(iter.size_hint(), (2, Some(5)));
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assert_eq!(format!("{:?}", &iter),
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format!("Utf16CharMerger {{ buffered: None, inner: {:?} }}", slice.iter()));
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assert_eq!(iter.next(), Some(Err(UnmatchedLeadingSurrogate)));
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assert_eq!(iter.size_hint(), (1, Some(4)));
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assert_eq!(
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format!("{:?}", &iter),
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format!("Utf16CharMerger {{ buffered: Some(120), inner: {:?} }}", slice[2..].iter())
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);
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assert_eq!(iter.into_inner().next(), Some(&0xd900));
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}
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#[test] fn utf16chardecoder() {
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let slice = [0xd800, 'x' as u16, 0xd900, 0xdfff, 'λ' as u16];
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let mut iter = slice.utf16char_indices();
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assert_eq!(iter.size_hint(), (2, Some(5)));
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assert_eq!(
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format!("{:?}", &iter),
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format!("Utf16CharDecoder {{ units[0..]: {:?} }}", &slice)
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);
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assert_eq!(iter.next(), Some((0, Err(UnmatchedLeadingSurrogate), 1)));
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assert_eq!(
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format!("{:?}", &iter),
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format!("Utf16CharDecoder {{ units[1..]: {:?} }}", &slice[1..])
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);
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assert_eq!(iter.size_hint(), (2, Some(4)));
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assert_eq!(iter.count(), 3);
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}
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/// Tests for ensuring that iterators which also implement Read support
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/// interleaving calls of `read()` and `next()`, and that they implement Read
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/// correctly (support any buffer size at any time).
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#[test] fn read_single_ascii() {
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let uc = 'a'.to_utf8();
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assert_eq!(uc.len(), 1);
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for chunk in 1..5 {
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let mut buf = [b'E'; 6];
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let mut iter = uc.into_iter();
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let mut written = 0;
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for _ in 0..4 {
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assert_eq!(iter.read(&mut buf[..0]).unwrap(), 0);
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let wrote = iter.read(&mut buf[written..written+chunk]).unwrap();
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assert_eq!(wrote, min(1-written, chunk));
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written += wrote;
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for &b in &buf[written..] {assert_eq!(b, b'E');}
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assert_eq!(buf[..written], AsRef::<[u8]>::as_ref(&uc)[..written]);
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}
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assert_eq!(written, 1);
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}
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}
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#[test] fn read_single_nonascii() {
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let uc = 'ä'.to_utf8();
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assert_eq!(uc.len(), 2);
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for chunk in 1..5 {
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let mut buf = [b'E'; 6];
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let mut iter = uc.into_iter();
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let mut written = 0;
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for _ in 0..4 {
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assert_eq!(iter.read(&mut buf[..0]).unwrap(), 0);
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let wrote = iter.read(&mut buf[written..written+chunk]).unwrap();
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assert_eq!(wrote, min(2-written, chunk));
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written += wrote;
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for &b in &buf[written..] {assert_eq!(b, b'E');}
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assert_eq!(buf[..written], AsRef::<[u8]>::as_ref(&uc)[..written]);
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}
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assert_eq!(written, 2);
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}
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}
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#[test] fn utf8charsplitter_read_all_sizes() {
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let s = "1111\u{104444}\u{222}1\u{833}1111\u{100004}";
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assert!(s.len()%3 == 1);
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let mut buf = vec![b'E'; s.len()+6];
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for size in 2..6 {//s.len()+4 {
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let mut reader = Utf8CharSplitter::from(s.chars().map(|c| c.to_utf8() ));
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for (offset, part) in s.as_bytes().chunks(size).enumerate() {
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let read_to = if part.len() == size {(offset+1)*size} else {buf.len()};
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assert_eq!(reader.read(&mut buf[offset*size..read_to]).unwrap(), part.len());
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assert_eq!(&buf[..offset*size+part.len()], &s.as_bytes()[..offset*size+part.len()]);
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}
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assert_eq!(reader.read(&mut buf[..]).unwrap(), 0);
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assert!(buf[s.len()..].iter().all(|&b| b==b'E' ));
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}
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}
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#[test] fn utf8charsplitter_alternate_iter_read() {
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let s = "1111\u{104444}\u{222}1\u{833}1111\u{100004}";
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let mut buf = [b'0'; 10];
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for n in 0..2 {
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// need to collect to test size_hint()
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// because chars().size_hint() returns ((bytes+3)/4, Some(bytes))
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let u8chars = s.chars().map(|c| c.to_utf8() ).collect::<Vec<_>>();
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let mut iter: Utf8CharSplitter<_,_> = u8chars.into_iter().into();
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for (i, byte) in s.bytes().enumerate() {
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let until_next = s.as_bytes()[i..].iter().take_while(|&b| (b>>6)==0b10u8 ).count();
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let remaining_chars = s[i+until_next..].chars().count();
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println!("{}. run: byte {:02} of {}, remaining: {:02}+{}: 0b{:08b} = {:?}",
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n, i, s.len(), remaining_chars, until_next, byte, byte as char);
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assert_eq!(iter.read(&mut[][..]).unwrap(), 0);
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if i % 2 == n {
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assert_eq!(iter.next(), Some(byte));
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} else {
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assert_eq!(iter.read(&mut buf[..1]).unwrap(), 1);
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assert_eq!(buf[0], byte);
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}
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}
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assert_eq!(iter.size_hint(), (0, Some(0)));
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assert_eq!(iter.next(), None);
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assert_eq!(iter.read(&mut buf[..]).unwrap(), 0);
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}
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}
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