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