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1d9454ab JW |
1 | // { dg-options "-std=gnu++20" } |
2 | // { dg-do run { target c++20 } } | |
3 | ||
4 | #include <format> | |
5 | #include <string> | |
6 | #include <limits> | |
7 | #include <cstdint> | |
8 | #include <testsuite_hooks.h> | |
9 | ||
10 | void | |
11 | test_no_args() | |
12 | { | |
13 | std::string s; | |
14 | s = std::format("disco"); | |
15 | VERIFY( s == "disco" ); | |
16 | ||
17 | s = std::format("}} machine {{ funk }} specialists {{"); | |
18 | VERIFY( s == "} machine { funk } specialists {" ); | |
19 | ||
20 | s = std::format("128bpm }}"); | |
21 | VERIFY( s == "128bpm }" ); | |
22 | } | |
23 | ||
24 | void | |
25 | test_unescaped() | |
26 | { | |
27 | #ifdef __cpp_exceptions | |
28 | for (auto f : { "{", "}", "{{{", "{{}", "}{", "{{{{{" }) | |
29 | try { | |
30 | (void) std::vformat(f, std::make_format_args()); | |
31 | VERIFY( false ); | |
32 | } catch (const std::format_error& e) { | |
33 | std::string what = e.what(); | |
34 | VERIFY( what.find("unmatched") != what.npos ); | |
35 | } | |
36 | #endif | |
37 | } | |
38 | ||
39 | struct brit_punc : std::numpunct<char> | |
40 | { | |
41 | std::string do_grouping() const override { return "\3\3"; } | |
42 | char do_thousands_sep() const override { return ','; } | |
43 | std::string do_truename() const override { return "yes mate"; } | |
44 | std::string do_falsename() const override { return "nah bruv"; } | |
45 | }; | |
46 | ||
47 | void | |
48 | test_std_examples() | |
49 | { | |
50 | using namespace std; | |
51 | ||
52 | string s = format("{0}-{{", 8); // value of s is "8-{" | |
53 | VERIFY( s == "8-{" ); | |
54 | ||
55 | // align | |
56 | { | |
57 | char c = 120; | |
58 | string s0 = format("{:6}", 42); | |
59 | VERIFY(s0 == " 42"); | |
60 | string s1 = format("{:6}", 'x'); | |
61 | VERIFY(s1 == "x "); | |
62 | string s2 = format("{:*<6}", 'x'); | |
63 | VERIFY(s2 == "x*****"); | |
64 | string s3 = format("{:*>6}", 'x'); | |
65 | VERIFY(s3 == "*****x"); | |
66 | string s4 = format("{:*^6}", 'x'); | |
67 | VERIFY(s4 == "**x***"); | |
68 | string s5 = format("{:6d}", c); | |
69 | VERIFY(s5 == " 120"); | |
70 | string s6 = format("{:6}", true); | |
71 | VERIFY(s6 == "true "); | |
72 | } | |
73 | ||
74 | // sign | |
75 | { | |
76 | double inf = numeric_limits<double>::infinity(); | |
77 | double nan = numeric_limits<double>::quiet_NaN(); | |
78 | string s0 = format("{0:},{0:+},{0:-},{0: }", 1); | |
79 | VERIFY(s0 == "1,+1,1, 1"); | |
80 | string s1 = format("{0:},{0:+},{0:-},{0: }", -1); | |
81 | VERIFY(s1 == "-1,-1,-1,-1"); | |
82 | string s2 = format("{0:},{0:+},{0:-},{0: }", inf); | |
83 | VERIFY(s2 == "inf,+inf,inf, inf"); | |
84 | string s3 = format("{0:},{0:+},{0:-},{0: }", nan); | |
85 | VERIFY(s3 == "nan,+nan,nan, nan"); | |
86 | } | |
87 | ||
88 | // alternate form and zero fill | |
89 | { | |
90 | char c = 120; | |
91 | string s1 = format("{:+06d}", c); | |
92 | VERIFY(s1 == "+00120"); | |
93 | string s2 = format("{:#06x}", 0xa); | |
94 | VERIFY(s2 == "0x000a"); | |
95 | string s3 = format("{:<06}", -42); | |
96 | VERIFY(s3 == "-42 "); // 0 is ignored because of < alignment | |
97 | } | |
98 | ||
99 | // integer presentation types | |
100 | { | |
101 | // Change global locale so "{:L}" adds digit separators. | |
102 | std::locale::global(std::locale({}, new brit_punc)); | |
103 | ||
104 | string s0 = format("{}", 42); | |
105 | VERIFY(s0 == "42"); | |
106 | string s1 = format("{0:b} {0:d} {0:o} {0:x}", 42); | |
107 | VERIFY(s1 == "101010 42 52 2a"); | |
108 | string s2 = format("{0:#x} {0:#X}", 42); | |
109 | VERIFY(s2 == "0x2a 0X2A"); | |
110 | string s3 = format("{:L}", 1234); | |
111 | VERIFY(s3 == "1,234"); | |
112 | ||
113 | // Restore | |
114 | std::locale::global(std::locale::classic()); | |
115 | } | |
116 | } | |
117 | ||
118 | void | |
119 | test_alternate_forms() | |
120 | { | |
121 | std::string s; | |
122 | ||
123 | s = std::format("{0:#b} {0:+#B} {0:#o} {0:#x} {0:+#X} {0: #d}", 42); | |
124 | VERIFY( s == "0b101010 +0B101010 052 0x2a +0X2A 42" ); | |
125 | s = std::format("{0:#b} {0:+#B} {0:#o} {0:#x} {0:+#X} {0: #d}", 0); | |
126 | VERIFY( s == "0b0 +0B0 0 0x0 +0X0 0" ); | |
127 | ||
128 | s = std::format("{0:+#012g} {0:+#014g} {0:+#014g}", 1234.0); | |
129 | VERIFY( s == "+00001234.00 +0000001234.00 +0000001234.00" ); | |
130 | s = std::format("{0:+#0{1}g} {0:+#0{2}g} {0:+#0{2}g}", 1234.5, 12, 14); | |
131 | VERIFY( s == "+00001234.50 +0000001234.50 +0000001234.50" ); | |
132 | ||
133 | s = std::format("{:#.2g}", -0.0); | |
134 | VERIFY( s == "-0.0" ); | |
135 | } | |
136 | ||
137 | struct euro_punc : std::numpunct<char> | |
138 | { | |
139 | std::string do_grouping() const override { return "\3\3"; } | |
140 | char do_thousands_sep() const override { return '.'; } | |
141 | char do_decimal_point() const override { return ','; } | |
142 | }; | |
143 | ||
144 | void | |
145 | test_locale() | |
146 | { | |
147 | // The default C locale. | |
148 | std::locale cloc = std::locale::classic(); | |
149 | // A custom locale using comma digit separators. | |
150 | std::locale bloc(cloc, new brit_punc); | |
151 | // A custom locale using period digit separators. | |
152 | std::locale eloc(cloc, new euro_punc); | |
153 | ||
154 | std::string s; | |
155 | ||
156 | // Change the global locale: | |
157 | std::locale::global(bloc); | |
158 | // Format using the global locale: | |
159 | s = std::format("{0:L} {0:Lx} {0:Lb}", 12345); | |
160 | VERIFY( s == "12,345 3,039 11,000,000,111,001" ); | |
161 | s = std::format("{0:L} {0:.7Lg} {0:La}", 12345.6789); | |
162 | VERIFY( s == "12,345.6789 12,345.68 1.81cd6e631f8a1p+13" ); | |
163 | ||
164 | s = std::format("{0:s} {0:L} {1:Ls} {0:Ld}", true, false); | |
165 | VERIFY( s == "true yes mate nah bruv 1" ); | |
166 | ||
167 | // Format using a specific locale: | |
168 | s = std::format(eloc, "{0:L} {0:Lx} {0:Lb}", 12345); | |
169 | VERIFY( s == "12.345 3.039 11.000.000.111.001" ); | |
170 | s = std::format(eloc, "{0:L} {0:.7LG} {0:La}", 12345.6789); | |
171 | VERIFY( s == "12.345,6789 12.345,68 1,81cd6e631f8a1p+13" ); | |
172 | ||
173 | s = std::format(eloc, "{0:#Lg} {0:+#.3Lg} {0:#08.4Lg}", -1234.); | |
174 | VERIFY( s == "-1.234,00 -1,23e+03 -01.234," ); | |
175 | ||
176 | // Restore | |
177 | std::locale::global(cloc); | |
178 | } | |
179 | ||
180 | void | |
181 | test_width() | |
182 | { | |
183 | std::string s; | |
184 | ||
185 | s = std::format("{:4}", ""); | |
186 | VERIFY( s == " " ); | |
187 | s = std::format("{:{}}", "", 3); | |
188 | VERIFY( s == " " ); | |
189 | s = std::format("{1:{0}}", 2, ""); | |
190 | VERIFY( s == " " ); | |
191 | s = std::format("{:03}", 9); | |
192 | VERIFY( s == "009" ); | |
193 | ||
194 | s = std::format("DR {0:{1}}: allow width {1} from arg-id", 3721, 0); | |
195 | VERIFY( s == "DR 3721: allow width 0 from arg-id" ); | |
196 | ||
197 | try { | |
198 | s = std::format("Negative width is an error: {0:{1}}", 123, -1); | |
199 | VERIFY(false); | |
200 | } catch (const std::format_error&) { | |
201 | } | |
202 | ||
203 | try { | |
204 | auto args = std::make_format_args(false, true); | |
205 | s = std::vformat("DR 3720: restrict type of width arg-id {0:{1}}", args); | |
206 | VERIFY(false); | |
207 | } catch (const std::format_error&) { | |
208 | } | |
209 | ||
210 | try { | |
211 | auto args = std::make_format_args('?', '!'); | |
212 | s = std::vformat("DR 3720: restrict type of width arg-id {0:{1}}", args); | |
213 | VERIFY(false); | |
214 | } catch (const std::format_error&) { | |
215 | } | |
216 | } | |
217 | ||
218 | void | |
219 | test_wchar() | |
220 | { | |
221 | using namespace std::literals; | |
222 | std::wstring s; | |
223 | ||
224 | s = std::format(L"{} {} {} {} {} {}", L'0', 1, 2LL, 3.4, L"five", L"six"s); | |
225 | VERIFY( s == L"0 1 2 3.4 five six" ); | |
226 | ||
227 | std::locale loc; | |
228 | s = std::format(loc, L"{:L} {:.3s}{:Lc}", true, L"data"sv, '.'); | |
229 | VERIFY( s == L"true dat." ); | |
230 | } | |
231 | ||
232 | void | |
233 | test_minmax() | |
234 | { | |
235 | auto check = []<typename T>(T) { | |
236 | const int digits = std::numeric_limits<T>::digits; | |
237 | const std::string zeros(digits, '0'); | |
238 | const std::string ones(digits, '1'); | |
239 | auto s = std::format("{:b}" , std::numeric_limits<T>::min()); | |
240 | VERIFY( s == "-1" + zeros ); | |
241 | s = std::format("{:b}" , std::numeric_limits<T>::max()); | |
242 | VERIFY( s == ones ); | |
243 | using U = std::make_unsigned_t<T>; | |
244 | s = std::format("{:0{}b}" , std::numeric_limits<U>::min(), digits + 1); | |
245 | VERIFY( s == '0' + zeros ); | |
246 | s = std::format("{:b}" , std::numeric_limits<U>::max()); | |
247 | VERIFY( s == '1' + ones ); | |
248 | }; | |
249 | check(std::int8_t(0)); | |
250 | check(std::int16_t(0)); | |
251 | check(std::int32_t(0)); | |
252 | check(std::int64_t(0)); | |
253 | #ifdef __SIZEOF_INT128__ | |
254 | check(__int128(0)); | |
255 | #endif | |
256 | } | |
257 | ||
258 | void | |
259 | test_p1652r1() // printf corner cases in std::format | |
260 | { | |
261 | std::string s; | |
262 | ||
263 | // Problem 1: "#o" specification should not print 0 as "00" | |
264 | s = std::format("{:#o}", 0); | |
265 | VERIFY( s == "0" ); | |
266 | ||
267 | // Problem 2: 'c' should be able to print 65 as "A" (ASCII) | |
268 | int c = 'A'; | |
269 | s = std::format("{:c}", c); | |
270 | VERIFY( s == "A" ); | |
271 | ||
272 | // Problem 3: "-000nan" is not a floating point value | |
273 | double nan = std::numeric_limits<double>::quiet_NaN(); | |
274 | try { | |
275 | s = std::vformat("{:0=6}", std::make_format_args(nan)); | |
276 | VERIFY( false ); | |
277 | } catch (const std::format_error&) { | |
278 | } | |
279 | ||
280 | s = std::format("{:06}", nan); | |
281 | VERIFY( s == " nan" ); | |
282 | ||
283 | // Problem 4: bool needs a type format specifier | |
284 | s = std::format("{:s}", true); | |
285 | VERIFY( s == "true" ); | |
286 | ||
287 | // Problem 5: double does not roundtrip float | |
288 | s = std::format("{}", 3.31f); | |
289 | VERIFY( s == "3.31" ); | |
290 | } | |
291 | ||
292 | void | |
293 | test_float128() | |
294 | { | |
295 | #ifdef __SIZEOF_FLOAT128__ | |
296 | auto s = std::format("{:#} != {:<+7.3f}", (__float128)-0.0, (__float128)0.5); | |
297 | VERIFY( s == "-0. != +0.500 " ); | |
298 | #endif | |
299 | } | |
300 | ||
301 | int main() | |
302 | { | |
303 | test_no_args(); | |
304 | test_unescaped(); | |
305 | test_std_examples(); | |
306 | test_alternate_forms(); | |
307 | test_locale(); | |
308 | test_width(); | |
309 | test_wchar(); | |
310 | test_minmax(); | |
311 | test_p1652r1(); | |
312 | test_float128(); | |
313 | } |