use std::convert::TryFrom; use std::str::FromStr; use std::{char, str}; #[test] fn test_convert() { assert_eq!(u32::from('a'), 0x61); assert_eq!(u64::from('b'), 0x62); assert_eq!(u128::from('c'), 0x63); assert_eq!(char::from(b'\0'), '\0'); assert_eq!(char::from(b'a'), 'a'); assert_eq!(char::from(b'\xFF'), '\u{FF}'); assert_eq!(char::try_from(0_u32), Ok('\0')); assert_eq!(char::try_from(0x61_u32), Ok('a')); assert_eq!(char::try_from(0xD7FF_u32), Ok('\u{D7FF}')); assert!(char::try_from(0xD800_u32).is_err()); assert!(char::try_from(0xDFFF_u32).is_err()); assert_eq!(char::try_from(0xE000_u32), Ok('\u{E000}')); assert_eq!(char::try_from(0x10FFFF_u32), Ok('\u{10FFFF}')); assert!(char::try_from(0x110000_u32).is_err()); assert!(char::try_from(0xFFFF_FFFF_u32).is_err()); } #[test] const fn test_convert_const() { assert!(u32::from('a') == 0x61); assert!(u64::from('b') == 0x62); assert!(u128::from('c') == 0x63); assert!(char::from(b'\0') == '\0'); assert!(char::from(b'a') == 'a'); assert!(char::from(b'\xFF') == '\u{FF}'); } #[test] fn test_from_str() { assert_eq!(char::from_str("a").unwrap(), 'a'); assert_eq!(char::from_str("\0").unwrap(), '\0'); assert_eq!(char::from_str("\u{D7FF}").unwrap(), '\u{d7FF}'); assert!(char::from_str("").is_err()); assert!(char::from_str("abc").is_err()); } #[test] fn test_is_lowercase() { assert!('a'.is_lowercase()); assert!('ö'.is_lowercase()); assert!('ß'.is_lowercase()); assert!(!'Ü'.is_lowercase()); assert!(!'P'.is_lowercase()); } #[test] fn test_is_uppercase() { assert!(!'h'.is_uppercase()); assert!(!'ä'.is_uppercase()); assert!(!'ß'.is_uppercase()); assert!('Ö'.is_uppercase()); assert!('T'.is_uppercase()); } #[test] fn test_is_whitespace() { assert!(' '.is_whitespace()); assert!('\u{2007}'.is_whitespace()); assert!('\t'.is_whitespace()); assert!('\n'.is_whitespace()); assert!(!'a'.is_whitespace()); assert!(!'_'.is_whitespace()); assert!(!'\u{0}'.is_whitespace()); } #[test] fn test_to_digit() { assert_eq!('0'.to_digit(10), Some(0)); assert_eq!('1'.to_digit(2), Some(1)); assert_eq!('2'.to_digit(3), Some(2)); assert_eq!('9'.to_digit(10), Some(9)); assert_eq!('a'.to_digit(16), Some(10)); assert_eq!('A'.to_digit(16), Some(10)); assert_eq!('b'.to_digit(16), Some(11)); assert_eq!('B'.to_digit(16), Some(11)); assert_eq!('A'.to_digit(36), Some(10)); assert_eq!('z'.to_digit(36), Some(35)); assert_eq!('Z'.to_digit(36), Some(35)); assert_eq!('['.to_digit(36), None); assert_eq!('`'.to_digit(36), None); assert_eq!('{'.to_digit(36), None); assert_eq!('$'.to_digit(36), None); assert_eq!('@'.to_digit(16), None); assert_eq!('G'.to_digit(16), None); assert_eq!('g'.to_digit(16), None); assert_eq!(' '.to_digit(10), None); assert_eq!('/'.to_digit(10), None); assert_eq!(':'.to_digit(10), None); assert_eq!(':'.to_digit(11), None); } #[test] fn test_to_lowercase() { fn lower(c: char) -> String { let to_lowercase = c.to_lowercase(); assert_eq!(to_lowercase.len(), to_lowercase.count()); let iter: String = c.to_lowercase().collect(); let disp: String = c.to_lowercase().to_string(); assert_eq!(iter, disp); let iter_rev: String = c.to_lowercase().rev().collect(); let disp_rev: String = disp.chars().rev().collect(); assert_eq!(iter_rev, disp_rev); iter } assert_eq!(lower('A'), "a"); assert_eq!(lower('Ö'), "ö"); assert_eq!(lower('ß'), "ß"); assert_eq!(lower('Ü'), "ü"); assert_eq!(lower('💩'), "💩"); assert_eq!(lower('Σ'), "σ"); assert_eq!(lower('Τ'), "τ"); assert_eq!(lower('Ι'), "ι"); assert_eq!(lower('Γ'), "γ"); assert_eq!(lower('Μ'), "μ"); assert_eq!(lower('Α'), "α"); assert_eq!(lower('Σ'), "σ"); assert_eq!(lower('Dž'), "dž"); assert_eq!(lower('fi'), "fi"); assert_eq!(lower('İ'), "i\u{307}"); } #[test] fn test_to_uppercase() { fn upper(c: char) -> String { let to_uppercase = c.to_uppercase(); assert_eq!(to_uppercase.len(), to_uppercase.count()); let iter: String = c.to_uppercase().collect(); let disp: String = c.to_uppercase().to_string(); assert_eq!(iter, disp); let iter_rev: String = c.to_uppercase().rev().collect(); let disp_rev: String = disp.chars().rev().collect(); assert_eq!(iter_rev, disp_rev); iter } assert_eq!(upper('a'), "A"); assert_eq!(upper('ö'), "Ö"); assert_eq!(upper('ß'), "SS"); // not ẞ: Latin capital letter sharp s assert_eq!(upper('ü'), "Ü"); assert_eq!(upper('💩'), "💩"); assert_eq!(upper('σ'), "Σ"); assert_eq!(upper('τ'), "Τ"); assert_eq!(upper('ι'), "Ι"); assert_eq!(upper('γ'), "Γ"); assert_eq!(upper('μ'), "Μ"); assert_eq!(upper('α'), "Α"); assert_eq!(upper('ς'), "Σ"); assert_eq!(upper('Dž'), "DŽ"); assert_eq!(upper('fi'), "FI"); assert_eq!(upper('ᾀ'), "ἈΙ"); } #[test] fn test_is_control() { assert!('\u{0}'.is_control()); assert!('\u{3}'.is_control()); assert!('\u{6}'.is_control()); assert!('\u{9}'.is_control()); assert!('\u{7f}'.is_control()); assert!('\u{92}'.is_control()); assert!(!'\u{20}'.is_control()); assert!(!'\u{55}'.is_control()); assert!(!'\u{68}'.is_control()); } #[test] fn test_is_numeric() { assert!('2'.is_numeric()); assert!('7'.is_numeric()); assert!('¾'.is_numeric()); assert!(!'c'.is_numeric()); assert!(!'i'.is_numeric()); assert!(!'z'.is_numeric()); assert!(!'Q'.is_numeric()); } #[test] fn test_escape_debug() { fn string(c: char) -> String { let iter: String = c.escape_debug().collect(); let disp: String = c.escape_debug().to_string(); assert_eq!(iter, disp); iter } assert_eq!(string('\n'), "\\n"); assert_eq!(string('\r'), "\\r"); assert_eq!(string('\''), "\\'"); assert_eq!(string('"'), "\\\""); assert_eq!(string(' '), " "); assert_eq!(string('a'), "a"); assert_eq!(string('~'), "~"); assert_eq!(string('é'), "é"); assert_eq!(string('文'), "文"); assert_eq!(string('\x00'), "\\0"); assert_eq!(string('\x1f'), "\\u{1f}"); assert_eq!(string('\x7f'), "\\u{7f}"); assert_eq!(string('\u{80}'), "\\u{80}"); assert_eq!(string('\u{ff}'), "\u{ff}"); assert_eq!(string('\u{11b}'), "\u{11b}"); assert_eq!(string('\u{1d4b6}'), "\u{1d4b6}"); assert_eq!(string('\u{301}'), "\\u{301}"); // combining character assert_eq!(string('\u{200b}'), "\\u{200b}"); // zero width space assert_eq!(string('\u{e000}'), "\\u{e000}"); // private use 1 assert_eq!(string('\u{100000}'), "\\u{100000}"); // private use 2 } #[test] fn test_escape_default() { fn string(c: char) -> String { let iter: String = c.escape_default().collect(); let disp: String = c.escape_default().to_string(); assert_eq!(iter, disp); iter } assert_eq!(string('\n'), "\\n"); assert_eq!(string('\r'), "\\r"); assert_eq!(string('\''), "\\'"); assert_eq!(string('"'), "\\\""); assert_eq!(string(' '), " "); assert_eq!(string('a'), "a"); assert_eq!(string('~'), "~"); assert_eq!(string('é'), "\\u{e9}"); assert_eq!(string('\x00'), "\\u{0}"); assert_eq!(string('\x1f'), "\\u{1f}"); assert_eq!(string('\x7f'), "\\u{7f}"); assert_eq!(string('\u{80}'), "\\u{80}"); assert_eq!(string('\u{ff}'), "\\u{ff}"); assert_eq!(string('\u{11b}'), "\\u{11b}"); assert_eq!(string('\u{1d4b6}'), "\\u{1d4b6}"); assert_eq!(string('\u{200b}'), "\\u{200b}"); // zero width space assert_eq!(string('\u{e000}'), "\\u{e000}"); // private use 1 assert_eq!(string('\u{100000}'), "\\u{100000}"); // private use 2 } #[test] fn test_escape_unicode() { fn string(c: char) -> String { let iter: String = c.escape_unicode().collect(); let disp: String = c.escape_unicode().to_string(); assert_eq!(iter, disp); iter } assert_eq!(string('\x00'), "\\u{0}"); assert_eq!(string('\n'), "\\u{a}"); assert_eq!(string(' '), "\\u{20}"); assert_eq!(string('a'), "\\u{61}"); assert_eq!(string('\u{11b}'), "\\u{11b}"); assert_eq!(string('\u{1d4b6}'), "\\u{1d4b6}"); } #[test] fn test_encode_utf8() { fn check(input: char, expect: &[u8]) { let mut buf = [0; 4]; let ptr = buf.as_ptr(); let s = input.encode_utf8(&mut buf); assert_eq!(s.as_ptr() as usize, ptr as usize); assert!(str::from_utf8(s.as_bytes()).is_ok()); assert_eq!(s.as_bytes(), expect); } check('x', &[0x78]); check('\u{e9}', &[0xc3, 0xa9]); check('\u{a66e}', &[0xea, 0x99, 0xae]); check('\u{1f4a9}', &[0xf0, 0x9f, 0x92, 0xa9]); } #[test] fn test_encode_utf16() { fn check(input: char, expect: &[u16]) { let mut buf = [0; 2]; let ptr = buf.as_mut_ptr(); let b = input.encode_utf16(&mut buf); assert_eq!(b.as_mut_ptr() as usize, ptr as usize); assert_eq!(b, expect); } check('x', &[0x0078]); check('\u{e9}', &[0x00e9]); check('\u{a66e}', &[0xa66e]); check('\u{1f4a9}', &[0xd83d, 0xdca9]); } #[test] fn test_len_utf16() { assert!('x'.len_utf16() == 1); assert!('\u{e9}'.len_utf16() == 1); assert!('\u{a66e}'.len_utf16() == 1); assert!('\u{1f4a9}'.len_utf16() == 2); } #[test] fn test_decode_utf16() { fn check(s: &[u16], expected: &[Result]) { let v = char::decode_utf16(s.iter().cloned()) .map(|r| r.map_err(|e| e.unpaired_surrogate())) .collect::>(); assert_eq!(v, expected); } check(&[0xD800, 0x41, 0x42], &[Err(0xD800), Ok('A'), Ok('B')]); check(&[0xD800, 0], &[Err(0xD800), Ok('\0')]); check(&[0xD800], &[Err(0xD800)]); check(&[0xD840, 0xDC00], &[Ok('\u{20000}')]); check(&[0xD840, 0xD840, 0xDC00], &[Err(0xD840), Ok('\u{20000}')]); check(&[0xDC00, 0xD840], &[Err(0xDC00), Err(0xD840)]); } #[test] fn test_decode_utf16_size_hint() { fn check(s: &[u16]) { let mut iter = char::decode_utf16(s.iter().cloned()); loop { let count = iter.clone().count(); let (lower, upper) = iter.size_hint(); assert!( lower <= count && count <= upper.unwrap(), "lower = {lower}, count = {count}, upper = {upper:?}" ); if let None = iter.next() { break; } } } check(&[0xD800, 0xD800, 0xDC00]); check(&[0xD800, 0xD800, 0x0]); check(&[0xD800, 0x41, 0x42]); check(&[0xD800, 0]); check(&[0xD834, 0x006d]); } #[test] fn ed_iterator_specializations() { // Check counting assert_eq!('\n'.escape_default().count(), 2); assert_eq!('c'.escape_default().count(), 1); assert_eq!(' '.escape_default().count(), 1); assert_eq!('\\'.escape_default().count(), 2); assert_eq!('\''.escape_default().count(), 2); // Check nth // Check that OoB is handled correctly assert_eq!('\n'.escape_default().nth(2), None); assert_eq!('c'.escape_default().nth(1), None); assert_eq!(' '.escape_default().nth(1), None); assert_eq!('\\'.escape_default().nth(2), None); assert_eq!('\''.escape_default().nth(2), None); // Check the first char assert_eq!('\n'.escape_default().nth(0), Some('\\')); assert_eq!('c'.escape_default().nth(0), Some('c')); assert_eq!(' '.escape_default().nth(0), Some(' ')); assert_eq!('\\'.escape_default().nth(0), Some('\\')); assert_eq!('\''.escape_default().nth(0), Some('\\')); // Check the second char assert_eq!('\n'.escape_default().nth(1), Some('n')); assert_eq!('\\'.escape_default().nth(1), Some('\\')); assert_eq!('\''.escape_default().nth(1), Some('\'')); // Check the last char assert_eq!('\n'.escape_default().last(), Some('n')); assert_eq!('c'.escape_default().last(), Some('c')); assert_eq!(' '.escape_default().last(), Some(' ')); assert_eq!('\\'.escape_default().last(), Some('\\')); assert_eq!('\''.escape_default().last(), Some('\'')); } #[test] fn eu_iterator_specializations() { fn check(c: char) { let len = c.escape_unicode().count(); // Check OoB assert_eq!(c.escape_unicode().nth(len), None); // For all possible in-bound offsets let mut iter = c.escape_unicode(); for offset in 0..len { // Check last assert_eq!(iter.clone().last(), Some('}')); // Check len assert_eq!(iter.len(), len - offset); // Check size_hint (= len in ExactSizeIterator) assert_eq!(iter.size_hint(), (iter.len(), Some(iter.len()))); // Check counting assert_eq!(iter.clone().count(), len - offset); // Check nth assert_eq!(c.escape_unicode().nth(offset), iter.next()); } // Check post-last assert_eq!(iter.clone().last(), None); assert_eq!(iter.clone().count(), 0); } check('\u{0}'); check('\u{1}'); check('\u{12}'); check('\u{123}'); check('\u{1234}'); check('\u{12340}'); check('\u{10FFFF}'); }