1 use std::convert::TryFrom;
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());
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());
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());
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());
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());
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!('z'.to_digit(36), Some(35));
71 assert_eq!('Z'.to_digit(36), Some(35));
72 assert_eq!(' '.to_digit(10), None);
73 assert_eq!('$'.to_digit(36), None);
77 fn test_to_lowercase() {
78 fn lower(c: char) -> String {
79 let to_lowercase = c.to_lowercase();
80 assert_eq!(to_lowercase.len(), to_lowercase.count());
81 let iter: String = c.to_lowercase().collect();
82 let disp: String = c.to_lowercase().to_string();
83 assert_eq!(iter, disp);
86 assert_eq!(lower('A'), "a");
87 assert_eq!(lower('Ö'), "ö");
88 assert_eq!(lower('ß'), "ß");
89 assert_eq!(lower('Ü'), "ü");
90 assert_eq!(lower('💩'), "💩");
91 assert_eq!(lower('Σ'), "σ");
92 assert_eq!(lower('Τ'), "τ");
93 assert_eq!(lower('Ι'), "ι");
94 assert_eq!(lower('Γ'), "γ");
95 assert_eq!(lower('Μ'), "μ");
96 assert_eq!(lower('Α'), "α");
97 assert_eq!(lower('Σ'), "σ");
98 assert_eq!(lower('Dž'), "dž");
99 assert_eq!(lower('fi'), "fi");
100 assert_eq!(lower('İ'), "i\u{307}");
104 fn test_to_uppercase() {
105 fn upper(c: char) -> String {
106 let to_uppercase = c.to_uppercase();
107 assert_eq!(to_uppercase.len(), to_uppercase.count());
108 let iter: String = c.to_uppercase().collect();
109 let disp: String = c.to_uppercase().to_string();
110 assert_eq!(iter, disp);
113 assert_eq!(upper('a'), "A");
114 assert_eq!(upper('ö'), "Ö");
115 assert_eq!(upper('ß'), "SS"); // not ẞ: Latin capital letter sharp s
116 assert_eq!(upper('ü'), "Ü");
117 assert_eq!(upper('💩'), "💩");
119 assert_eq!(upper('σ'), "Σ");
120 assert_eq!(upper('τ'), "Τ");
121 assert_eq!(upper('ι'), "Ι");
122 assert_eq!(upper('γ'), "Γ");
123 assert_eq!(upper('μ'), "Μ");
124 assert_eq!(upper('α'), "Α");
125 assert_eq!(upper('ς'), "Σ");
126 assert_eq!(upper('Dž'), "DŽ");
127 assert_eq!(upper('fi'), "FI");
128 assert_eq!(upper('ᾀ'), "ἈΙ");
132 fn test_is_control() {
133 assert!('\u{0}'.is_control());
134 assert!('\u{3}'.is_control());
135 assert!('\u{6}'.is_control());
136 assert!('\u{9}'.is_control());
137 assert!('\u{7f}'.is_control());
138 assert!('\u{92}'.is_control());
139 assert!(!'\u{20}'.is_control());
140 assert!(!'\u{55}'.is_control());
141 assert!(!'\u{68}'.is_control());
145 fn test_is_numeric() {
146 assert!('2'.is_numeric());
147 assert!('7'.is_numeric());
148 assert!('¾'.is_numeric());
149 assert!(!'c'.is_numeric());
150 assert!(!'i'.is_numeric());
151 assert!(!'z'.is_numeric());
152 assert!(!'Q'.is_numeric());
156 fn test_escape_debug() {
157 fn string(c: char) -> String {
158 let iter: String = c.escape_debug().collect();
159 let disp: String = c.escape_debug().to_string();
160 assert_eq!(iter, disp);
163 assert_eq!(string('\n'), "\\n");
164 assert_eq!(string('\r'), "\\r");
165 assert_eq!(string('\''), "\\'");
166 assert_eq!(string('"'), "\\\"");
167 assert_eq!(string(' '), " ");
168 assert_eq!(string('a'), "a");
169 assert_eq!(string('~'), "~");
170 assert_eq!(string('é'), "é");
171 assert_eq!(string('文'), "文");
172 assert_eq!(string('\x00'), "\\u{0}");
173 assert_eq!(string('\x1f'), "\\u{1f}");
174 assert_eq!(string('\x7f'), "\\u{7f}");
175 assert_eq!(string('\u{80}'), "\\u{80}");
176 assert_eq!(string('\u{ff}'), "\u{ff}");
177 assert_eq!(string('\u{11b}'), "\u{11b}");
178 assert_eq!(string('\u{1d4b6}'), "\u{1d4b6}");
179 assert_eq!(string('\u{301}'), "\\u{301}"); // combining character
180 assert_eq!(string('\u{200b}'), "\\u{200b}"); // zero width space
181 assert_eq!(string('\u{e000}'), "\\u{e000}"); // private use 1
182 assert_eq!(string('\u{100000}'), "\\u{100000}"); // private use 2
186 fn test_escape_default() {
187 fn string(c: char) -> String {
188 let iter: String = c.escape_default().collect();
189 let disp: String = c.escape_default().to_string();
190 assert_eq!(iter, disp);
193 assert_eq!(string('\n'), "\\n");
194 assert_eq!(string('\r'), "\\r");
195 assert_eq!(string('\''), "\\'");
196 assert_eq!(string('"'), "\\\"");
197 assert_eq!(string(' '), " ");
198 assert_eq!(string('a'), "a");
199 assert_eq!(string('~'), "~");
200 assert_eq!(string('é'), "\\u{e9}");
201 assert_eq!(string('\x00'), "\\u{0}");
202 assert_eq!(string('\x1f'), "\\u{1f}");
203 assert_eq!(string('\x7f'), "\\u{7f}");
204 assert_eq!(string('\u{80}'), "\\u{80}");
205 assert_eq!(string('\u{ff}'), "\\u{ff}");
206 assert_eq!(string('\u{11b}'), "\\u{11b}");
207 assert_eq!(string('\u{1d4b6}'), "\\u{1d4b6}");
208 assert_eq!(string('\u{200b}'), "\\u{200b}"); // zero width space
209 assert_eq!(string('\u{e000}'), "\\u{e000}"); // private use 1
210 assert_eq!(string('\u{100000}'), "\\u{100000}"); // private use 2
214 fn test_escape_unicode() {
215 fn string(c: char) -> String {
216 let iter: String = c.escape_unicode().collect();
217 let disp: String = c.escape_unicode().to_string();
218 assert_eq!(iter, disp);
222 assert_eq!(string('\x00'), "\\u{0}");
223 assert_eq!(string('\n'), "\\u{a}");
224 assert_eq!(string(' '), "\\u{20}");
225 assert_eq!(string('a'), "\\u{61}");
226 assert_eq!(string('\u{11b}'), "\\u{11b}");
227 assert_eq!(string('\u{1d4b6}'), "\\u{1d4b6}");
231 fn test_encode_utf8() {
232 fn check(input: char, expect: &[u8]) {
233 let mut buf = [0; 4];
234 let ptr = buf.as_ptr();
235 let s = input.encode_utf8(&mut buf);
236 assert_eq!(s.as_ptr() as usize, ptr as usize);
237 assert!(str::from_utf8(s.as_bytes()).is_ok());
238 assert_eq!(s.as_bytes(), expect);
242 check('\u{e9}', &[0xc3, 0xa9]);
243 check('\u{a66e}', &[0xea, 0x99, 0xae]);
244 check('\u{1f4a9}', &[0xf0, 0x9f, 0x92, 0xa9]);
248 fn test_encode_utf16() {
249 fn check(input: char, expect: &[u16]) {
250 let mut buf = [0; 2];
251 let ptr = buf.as_mut_ptr();
252 let b = input.encode_utf16(&mut buf);
253 assert_eq!(b.as_mut_ptr() as usize, ptr as usize);
254 assert_eq!(b, expect);
257 check('x', &[0x0078]);
258 check('\u{e9}', &[0x00e9]);
259 check('\u{a66e}', &[0xa66e]);
260 check('\u{1f4a9}', &[0xd83d, 0xdca9]);
264 fn test_len_utf16() {
265 assert!('x'.len_utf16() == 1);
266 assert!('\u{e9}'.len_utf16() == 1);
267 assert!('\u{a66e}'.len_utf16() == 1);
268 assert!('\u{1f4a9}'.len_utf16() == 2);
272 fn test_decode_utf16() {
273 fn check(s: &[u16], expected: &[Result<char, u16>]) {
274 let v = char::decode_utf16(s.iter().cloned())
275 .map(|r| r.map_err(|e| e.unpaired_surrogate()))
276 .collect::<Vec<_>>();
277 assert_eq!(v, expected);
279 check(&[0xD800, 0x41, 0x42], &[Err(0xD800), Ok('A'), Ok('B')]);
280 check(&[0xD800, 0], &[Err(0xD800), Ok('\0')]);
284 fn ed_iterator_specializations() {
286 assert_eq!('\n'.escape_default().count(), 2);
287 assert_eq!('c'.escape_default().count(), 1);
288 assert_eq!(' '.escape_default().count(), 1);
289 assert_eq!('\\'.escape_default().count(), 2);
290 assert_eq!('\''.escape_default().count(), 2);
294 // Check that OoB is handled correctly
295 assert_eq!('\n'.escape_default().nth(2), None);
296 assert_eq!('c'.escape_default().nth(1), None);
297 assert_eq!(' '.escape_default().nth(1), None);
298 assert_eq!('\\'.escape_default().nth(2), None);
299 assert_eq!('\''.escape_default().nth(2), None);
301 // Check the first char
302 assert_eq!('\n'.escape_default().nth(0), Some('\\'));
303 assert_eq!('c'.escape_default().nth(0), Some('c'));
304 assert_eq!(' '.escape_default().nth(0), Some(' '));
305 assert_eq!('\\'.escape_default().nth(0), Some('\\'));
306 assert_eq!('\''.escape_default().nth(0), Some('\\'));
308 // Check the second char
309 assert_eq!('\n'.escape_default().nth(1), Some('n'));
310 assert_eq!('\\'.escape_default().nth(1), Some('\\'));
311 assert_eq!('\''.escape_default().nth(1), Some('\''));
313 // Check the last char
314 assert_eq!('\n'.escape_default().last(), Some('n'));
315 assert_eq!('c'.escape_default().last(), Some('c'));
316 assert_eq!(' '.escape_default().last(), Some(' '));
317 assert_eq!('\\'.escape_default().last(), Some('\\'));
318 assert_eq!('\''.escape_default().last(), Some('\''));
322 fn eu_iterator_specializations() {
324 let len = c.escape_unicode().count();
327 assert_eq!(c.escape_unicode().nth(len), None);
329 // For all possible in-bound offsets
330 let mut iter = c.escape_unicode();
331 for offset in 0..len {
333 assert_eq!(iter.clone().last(), Some('}'));
336 assert_eq!(iter.len(), len - offset);
338 // Check size_hint (= len in ExactSizeIterator)
339 assert_eq!(iter.size_hint(), (iter.len(), Some(iter.len())));
342 assert_eq!(iter.clone().count(), len - offset);
345 assert_eq!(c.escape_unicode().nth(offset), iter.next());
349 assert_eq!(iter.clone().last(), None);
350 assert_eq!(iter.clone().count(), 0);