library/core/tests/char.rs

   1 use std::convert::TryFrom;
   2 use std::str::FromStr;
   3 use std::{char, str};
   4
   5 #[test]
   6 fn test_convert() {
   7     assert_eq!(u32::from('a'), 0x61);
   8     assert_eq!(char::from(b'\0'), '\0');
   9     assert_eq!(char::from(b'a'), 'a');
  10     assert_eq!(char::from(b'\xFF'), '\u{FF}');
  11     assert_eq!(char::try_from(0_u32), Ok('\0'));
  12     assert_eq!(char::try_from(0x61_u32), Ok('a'));
  13     assert_eq!(char::try_from(0xD7FF_u32), Ok('\u{D7FF}'));
  14     assert!(char::try_from(0xD800_u32).is_err());
  15     assert!(char::try_from(0xDFFF_u32).is_err());
  16     assert_eq!(char::try_from(0xE000_u32), Ok('\u{E000}'));
  17     assert_eq!(char::try_from(0x10FFFF_u32), Ok('\u{10FFFF}'));
  18     assert!(char::try_from(0x110000_u32).is_err());
  19     assert!(char::try_from(0xFFFF_FFFF_u32).is_err());
  20 }
  21
  22 #[test]
  23 fn test_from_str() {
  24     assert_eq!(char::from_str("a").unwrap(), 'a');
  25     assert_eq!(char::from_str("\0").unwrap(), '\0');
  26     assert_eq!(char::from_str("\u{D7FF}").unwrap(), '\u{d7FF}');
  27     assert!(char::from_str("").is_err());
  28     assert!(char::from_str("abc").is_err());
  29 }
  30
  31 #[test]
  32 fn test_is_lowercase() {
  33     assert!('a'.is_lowercase());
  34     assert!('ö'.is_lowercase());
  35     assert!('ß'.is_lowercase());
  36     assert!(!'Ü'.is_lowercase());
  37     assert!(!'P'.is_lowercase());
  38 }
  39
  40 #[test]
  41 fn test_is_uppercase() {
  42     assert!(!'h'.is_uppercase());
  43     assert!(!'ä'.is_uppercase());
  44     assert!(!'ß'.is_uppercase());
  45     assert!('Ö'.is_uppercase());
  46     assert!('T'.is_uppercase());
  47 }
  48
  49 #[test]
  50 fn test_is_whitespace() {
  51     assert!(' '.is_whitespace());
  52     assert!('\u{2007}'.is_whitespace());
  53     assert!('\t'.is_whitespace());
  54     assert!('\n'.is_whitespace());
  55     assert!(!'a'.is_whitespace());
  56     assert!(!'_'.is_whitespace());
  57     assert!(!'\u{0}'.is_whitespace());
  58 }
  59
  60 #[test]
  61 fn test_to_digit() {
  62     assert_eq!('0'.to_digit(10), Some(0));
  63     assert_eq!('1'.to_digit(2), Some(1));
  64     assert_eq!('2'.to_digit(3), Some(2));
  65     assert_eq!('9'.to_digit(10), Some(9));
  66     assert_eq!('a'.to_digit(16), Some(10));
  67     assert_eq!('A'.to_digit(16), Some(10));
  68     assert_eq!('b'.to_digit(16), Some(11));
  69     assert_eq!('B'.to_digit(16), Some(11));
  70     assert_eq!('A'.to_digit(36), Some(10));
  71     assert_eq!('z'.to_digit(36), Some(35));
  72     assert_eq!('Z'.to_digit(36), Some(35));
  73     assert_eq!('['.to_digit(36), None);
  74     assert_eq!('`'.to_digit(36), None);
  75     assert_eq!('{'.to_digit(36), None);
  76     assert_eq!('$'.to_digit(36), None);
  77     assert_eq!('@'.to_digit(16), None);
  78     assert_eq!('G'.to_digit(16), None);
  79     assert_eq!('g'.to_digit(16), None);
  80     assert_eq!(' '.to_digit(10), None);
  81     assert_eq!('/'.to_digit(10), None);
  82     assert_eq!(':'.to_digit(10), None);
  83     assert_eq!(':'.to_digit(11), None);
  84 }
  85
  86 #[test]
  87 fn test_to_lowercase() {
  88     fn lower(c: char) -> String {
  89         let to_lowercase = c.to_lowercase();
  90         assert_eq!(to_lowercase.len(), to_lowercase.count());
  91         let iter: String = c.to_lowercase().collect();
  92         let disp: String = c.to_lowercase().to_string();
  93         assert_eq!(iter, disp);
  94         iter
  95     }
  96     assert_eq!(lower('A'), "a");
  97     assert_eq!(lower('Ö'), "ö");
  98     assert_eq!(lower('ß'), "ß");
  99     assert_eq!(lower('Ü'), "ü");
 100     assert_eq!(lower('💩'), "💩");
 101     assert_eq!(lower('Σ'), "σ");
 102     assert_eq!(lower('Τ'), "τ");
 103     assert_eq!(lower('Ι'), "ι");
 104     assert_eq!(lower('Γ'), "γ");
 105     assert_eq!(lower('Μ'), "μ");
 106     assert_eq!(lower('Α'), "α");
 107     assert_eq!(lower('Σ'), "σ");
 108     assert_eq!(lower('ǅ'), "ǆ");
 109     assert_eq!(lower('ﬁ'), "ﬁ");
 110     assert_eq!(lower('İ'), "i\u{307}");
 111 }
 112
 113 #[test]
 114 fn test_to_uppercase() {
 115     fn upper(c: char) -> String {
 116         let to_uppercase = c.to_uppercase();
 117         assert_eq!(to_uppercase.len(), to_uppercase.count());
 118         let iter: String = c.to_uppercase().collect();
 119         let disp: String = c.to_uppercase().to_string();
 120         assert_eq!(iter, disp);
 121         iter
 122     }
 123     assert_eq!(upper('a'), "A");
 124     assert_eq!(upper('ö'), "Ö");
 125     assert_eq!(upper('ß'), "SS"); // not ẞ: Latin capital letter sharp s
 126     assert_eq!(upper('ü'), "Ü");
 127     assert_eq!(upper('💩'), "💩");
 128
 129     assert_eq!(upper('σ'), "Σ");
 130     assert_eq!(upper('τ'), "Τ");
 131     assert_eq!(upper('ι'), "Ι");
 132     assert_eq!(upper('γ'), "Γ");
 133     assert_eq!(upper('μ'), "Μ");
 134     assert_eq!(upper('α'), "Α");
 135     assert_eq!(upper('ς'), "Σ");
 136     assert_eq!(upper('ǅ'), "Ǆ");
 137     assert_eq!(upper('ﬁ'), "FI");
 138     assert_eq!(upper('ᾀ'), "ἈΙ");
 139 }
 140
 141 #[test]
 142 fn test_is_control() {
 143     assert!('\u{0}'.is_control());
 144     assert!('\u{3}'.is_control());
 145     assert!('\u{6}'.is_control());
 146     assert!('\u{9}'.is_control());
 147     assert!('\u{7f}'.is_control());
 148     assert!('\u{92}'.is_control());
 149     assert!(!'\u{20}'.is_control());
 150     assert!(!'\u{55}'.is_control());
 151     assert!(!'\u{68}'.is_control());
 152 }
 153
 154 #[test]
 155 fn test_is_numeric() {
 156     assert!('2'.is_numeric());
 157     assert!('7'.is_numeric());
 158     assert!('¾'.is_numeric());
 159     assert!(!'c'.is_numeric());
 160     assert!(!'i'.is_numeric());
 161     assert!(!'z'.is_numeric());
 162     assert!(!'Q'.is_numeric());
 163 }
 164
 165 #[test]
 166 fn test_escape_debug() {
 167     fn string(c: char) -> String {
 168         let iter: String = c.escape_debug().collect();
 169         let disp: String = c.escape_debug().to_string();
 170         assert_eq!(iter, disp);
 171         iter
 172     }
 173     assert_eq!(string('\n'), "\\n");
 174     assert_eq!(string('\r'), "\\r");
 175     assert_eq!(string('\''), "\\'");
 176     assert_eq!(string('"'), "\\\"");
 177     assert_eq!(string(' '), " ");
 178     assert_eq!(string('a'), "a");
 179     assert_eq!(string('~'), "~");
 180     assert_eq!(string('é'), "é");
 181     assert_eq!(string('文'), "文");
 182     assert_eq!(string('\x00'), "\\u{0}");
 183     assert_eq!(string('\x1f'), "\\u{1f}");
 184     assert_eq!(string('\x7f'), "\\u{7f}");
 185     assert_eq!(string('\u{80}'), "\\u{80}");
 186     assert_eq!(string('\u{ff}'), "\u{ff}");
 187     assert_eq!(string('\u{11b}'), "\u{11b}");
 188     assert_eq!(string('\u{1d4b6}'), "\u{1d4b6}");
 189     assert_eq!(string('\u{301}'), "\\u{301}"); // combining character
 190     assert_eq!(string('\u{200b}'), "\\u{200b}"); // zero width space
 191     assert_eq!(string('\u{e000}'), "\\u{e000}"); // private use 1
 192     assert_eq!(string('\u{100000}'), "\\u{100000}"); // private use 2
 193 }
 194
 195 #[test]
 196 fn test_escape_default() {
 197     fn string(c: char) -> String {
 198         let iter: String = c.escape_default().collect();
 199         let disp: String = c.escape_default().to_string();
 200         assert_eq!(iter, disp);
 201         iter
 202     }
 203     assert_eq!(string('\n'), "\\n");
 204     assert_eq!(string('\r'), "\\r");
 205     assert_eq!(string('\''), "\\'");
 206     assert_eq!(string('"'), "\\\"");
 207     assert_eq!(string(' '), " ");
 208     assert_eq!(string('a'), "a");
 209     assert_eq!(string('~'), "~");
 210     assert_eq!(string('é'), "\\u{e9}");
 211     assert_eq!(string('\x00'), "\\u{0}");
 212     assert_eq!(string('\x1f'), "\\u{1f}");
 213     assert_eq!(string('\x7f'), "\\u{7f}");
 214     assert_eq!(string('\u{80}'), "\\u{80}");
 215     assert_eq!(string('\u{ff}'), "\\u{ff}");
 216     assert_eq!(string('\u{11b}'), "\\u{11b}");
 217     assert_eq!(string('\u{1d4b6}'), "\\u{1d4b6}");
 218     assert_eq!(string('\u{200b}'), "\\u{200b}"); // zero width space
 219     assert_eq!(string('\u{e000}'), "\\u{e000}"); // private use 1
 220     assert_eq!(string('\u{100000}'), "\\u{100000}"); // private use 2
 221 }
 222
 223 #[test]
 224 fn test_escape_unicode() {
 225     fn string(c: char) -> String {
 226         let iter: String = c.escape_unicode().collect();
 227         let disp: String = c.escape_unicode().to_string();
 228         assert_eq!(iter, disp);
 229         iter
 230     }
 231
 232     assert_eq!(string('\x00'), "\\u{0}");
 233     assert_eq!(string('\n'), "\\u{a}");
 234     assert_eq!(string(' '), "\\u{20}");
 235     assert_eq!(string('a'), "\\u{61}");
 236     assert_eq!(string('\u{11b}'), "\\u{11b}");
 237     assert_eq!(string('\u{1d4b6}'), "\\u{1d4b6}");
 238 }
 239
 240 #[test]
 241 fn test_encode_utf8() {
 242     fn check(input: char, expect: &[u8]) {
 243         let mut buf = [0; 4];
 244         let ptr = buf.as_ptr();
 245         let s = input.encode_utf8(&mut buf);
 246         assert_eq!(s.as_ptr() as usize, ptr as usize);
 247         assert!(str::from_utf8(s.as_bytes()).is_ok());
 248         assert_eq!(s.as_bytes(), expect);
 249     }
 250
 251     check('x', &[0x78]);
 252     check('\u{e9}', &[0xc3, 0xa9]);
 253     check('\u{a66e}', &[0xea, 0x99, 0xae]);
 254     check('\u{1f4a9}', &[0xf0, 0x9f, 0x92, 0xa9]);
 255 }
 256
 257 #[test]
 258 fn test_encode_utf16() {
 259     fn check(input: char, expect: &[u16]) {
 260         let mut buf = [0; 2];
 261         let ptr = buf.as_mut_ptr();
 262         let b = input.encode_utf16(&mut buf);
 263         assert_eq!(b.as_mut_ptr() as usize, ptr as usize);
 264         assert_eq!(b, expect);
 265     }
 266
 267     check('x', &[0x0078]);
 268     check('\u{e9}', &[0x00e9]);
 269     check('\u{a66e}', &[0xa66e]);
 270     check('\u{1f4a9}', &[0xd83d, 0xdca9]);
 271 }
 272
 273 #[test]
 274 fn test_len_utf16() {
 275     assert!('x'.len_utf16() == 1);
 276     assert!('\u{e9}'.len_utf16() == 1);
 277     assert!('\u{a66e}'.len_utf16() == 1);
 278     assert!('\u{1f4a9}'.len_utf16() == 2);
 279 }
 280
 281 #[test]
 282 fn test_decode_utf16() {
 283     fn check(s: &[u16], expected: &[Result<char, u16>]) {
 284         let v = char::decode_utf16(s.iter().cloned())
 285             .map(|r| r.map_err(|e| e.unpaired_surrogate()))
 286             .collect::<Vec<_>>();
 287         assert_eq!(v, expected);
 288     }
 289     check(&[0xD800, 0x41, 0x42], &[Err(0xD800), Ok('A'), Ok('B')]);
 290     check(&[0xD800, 0], &[Err(0xD800), Ok('\0')]);
 291 }
 292
 293 #[test]
 294 fn ed_iterator_specializations() {
 295     // Check counting
 296     assert_eq!('\n'.escape_default().count(), 2);
 297     assert_eq!('c'.escape_default().count(), 1);
 298     assert_eq!(' '.escape_default().count(), 1);
 299     assert_eq!('\\'.escape_default().count(), 2);
 300     assert_eq!('\''.escape_default().count(), 2);
 301
 302     // Check nth
 303
 304     // Check that OoB is handled correctly
 305     assert_eq!('\n'.escape_default().nth(2), None);
 306     assert_eq!('c'.escape_default().nth(1), None);
 307     assert_eq!(' '.escape_default().nth(1), None);
 308     assert_eq!('\\'.escape_default().nth(2), None);
 309     assert_eq!('\''.escape_default().nth(2), None);
 310
 311     // Check the first char
 312     assert_eq!('\n'.escape_default().nth(0), Some('\\'));
 313     assert_eq!('c'.escape_default().nth(0), Some('c'));
 314     assert_eq!(' '.escape_default().nth(0), Some(' '));
 315     assert_eq!('\\'.escape_default().nth(0), Some('\\'));
 316     assert_eq!('\''.escape_default().nth(0), Some('\\'));
 317
 318     // Check the second char
 319     assert_eq!('\n'.escape_default().nth(1), Some('n'));
 320     assert_eq!('\\'.escape_default().nth(1), Some('\\'));
 321     assert_eq!('\''.escape_default().nth(1), Some('\''));
 322
 323     // Check the last char
 324     assert_eq!('\n'.escape_default().last(), Some('n'));
 325     assert_eq!('c'.escape_default().last(), Some('c'));
 326     assert_eq!(' '.escape_default().last(), Some(' '));
 327     assert_eq!('\\'.escape_default().last(), Some('\\'));
 328     assert_eq!('\''.escape_default().last(), Some('\''));
 329 }
 330
 331 #[test]
 332 fn eu_iterator_specializations() {
 333     fn check(c: char) {
 334         let len = c.escape_unicode().count();
 335
 336         // Check OoB
 337         assert_eq!(c.escape_unicode().nth(len), None);
 338
 339         // For all possible in-bound offsets
 340         let mut iter = c.escape_unicode();
 341         for offset in 0..len {
 342             // Check last
 343             assert_eq!(iter.clone().last(), Some('}'));
 344
 345             // Check len
 346             assert_eq!(iter.len(), len - offset);
 347
 348             // Check size_hint (= len in ExactSizeIterator)
 349             assert_eq!(iter.size_hint(), (iter.len(), Some(iter.len())));
 350
 351             // Check counting
 352             assert_eq!(iter.clone().count(), len - offset);
 353
 354             // Check nth
 355             assert_eq!(c.escape_unicode().nth(offset), iter.next());
 356         }
 357
 358         // Check post-last
 359         assert_eq!(iter.clone().last(), None);
 360         assert_eq!(iter.clone().count(), 0);
 361     }
 362
 363     check('\u{0}');
 364     check('\u{1}');
 365     check('\u{12}');
 366     check('\u{123}');
 367     check('\u{1234}');
 368     check('\u{12340}');
 369     check('\u{10FFFF}');
 370 }