1 // Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 #![allow(unused_must_use)]
13 #![allow(unused_features)]
14 #![feature(box_syntax)]
16 use std::fmt::{self, Write};
24 impl fmt::LowerHex for A {
25 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
29 impl fmt::UpperHex for B {
30 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
34 impl fmt::Display for C {
35 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
36 f.pad_integral(true, "☃", "123")
39 impl fmt::Binary for D {
40 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
48 ($a:expr, $b:expr) => { assert_eq!($a, $b) }
52 // Various edge cases without formats
54 t!(format!("hello"), "hello");
55 t!(format!("hello {{"), "hello {");
57 // default formatters should work
58 t!(format!("{}", 1.0f32), "1");
59 t!(format!("{}", 1.0f64), "1");
60 t!(format!("{}", "a"), "a");
61 t!(format!("{}", "a".to_string()), "a");
62 t!(format!("{}", false), "false");
63 t!(format!("{}", 'a'), "a");
65 // At least exercise all the formats
66 t!(format!("{}", true), "true");
67 t!(format!("{}", '☃'), "☃");
68 t!(format!("{}", 10), "10");
69 t!(format!("{}", 10_usize), "10");
70 t!(format!("{:?}", '☃'), "'☃'");
71 t!(format!("{:?}", 10), "10");
72 t!(format!("{:?}", 10_usize), "10");
73 t!(format!("{:?}", "true"), "\"true\"");
74 t!(format!("{:?}", "foo\nbar"), "\"foo\\nbar\"");
75 t!(format!("{:?}", "foo\n\"bar\"\r\n\'baz\'\t\\qux\\"),
76 r#""foo\n\"bar\"\r\n\'baz\'\t\\qux\\""#);
77 t!(format!("{:?}", "foo\0bar\x01baz\u{7f}q\u{75}x"),
78 r#""foo\u{0}bar\u{1}baz\u{7f}qux""#);
79 t!(format!("{:o}", 10_usize), "12");
80 t!(format!("{:x}", 10_usize), "a");
81 t!(format!("{:X}", 10_usize), "A");
82 t!(format!("{}", "foo"), "foo");
83 t!(format!("{}", "foo".to_string()), "foo");
84 if cfg!(target_pointer_width = "32") {
85 t!(format!("{:#p}", 0x1234 as *const isize), "0x00001234");
86 t!(format!("{:#p}", 0x1234 as *mut isize), "0x00001234");
88 t!(format!("{:#p}", 0x1234 as *const isize), "0x0000000000001234");
89 t!(format!("{:#p}", 0x1234 as *mut isize), "0x0000000000001234");
91 t!(format!("{:p}", 0x1234 as *const isize), "0x1234");
92 t!(format!("{:p}", 0x1234 as *mut isize), "0x1234");
93 t!(format!("{:x}", A), "aloha");
94 t!(format!("{:X}", B), "adios");
95 t!(format!("foo {} ☃☃☃☃☃☃", "bar"), "foo bar ☃☃☃☃☃☃");
96 t!(format!("{1} {0}", 0, 1), "1 0");
97 t!(format!("{foo} {bar}", foo=0, bar=1), "0 1");
98 t!(format!("{foo} {1} {bar} {0}", 0, 1, foo=2, bar=3), "2 1 3 0");
99 t!(format!("{} {0}", "a"), "a a");
100 t!(format!("{foo_bar}", foo_bar=1), "1");
101 t!(format!("{}", 5 + 5), "10");
102 t!(format!("{:#4}", C), "☃123");
103 t!(format!("{:b}", D), "aa☃bb");
105 let a: &fmt::Debug = &1;
106 t!(format!("{:?}", a), "1");
109 // Formatting strings and their arguments
110 t!(format!("{}", "a"), "a");
111 t!(format!("{:4}", "a"), "a ");
112 t!(format!("{:4}", "☃"), "☃ ");
113 t!(format!("{:>4}", "a"), " a");
114 t!(format!("{:<4}", "a"), "a ");
115 t!(format!("{:^5}", "a"), " a ");
116 t!(format!("{:^5}", "aa"), " aa ");
117 t!(format!("{:^4}", "a"), " a ");
118 t!(format!("{:^4}", "aa"), " aa ");
119 t!(format!("{:.4}", "a"), "a");
120 t!(format!("{:4.4}", "a"), "a ");
121 t!(format!("{:4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
122 t!(format!("{:<4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
123 t!(format!("{:>4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
124 t!(format!("{:^4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
125 t!(format!("{:>10.4}", "aaaaaaaaaaaaaaaaaa"), " aaaa");
126 t!(format!("{:2.4}", "aaaaa"), "aaaa");
127 t!(format!("{:2.4}", "aaaa"), "aaaa");
128 t!(format!("{:2.4}", "aaa"), "aaa");
129 t!(format!("{:2.4}", "aa"), "aa");
130 t!(format!("{:2.4}", "a"), "a ");
131 t!(format!("{:0>2}", "a"), "0a");
132 t!(format!("{:.*}", 4, "aaaaaaaaaaaaaaaaaa"), "aaaa");
133 t!(format!("{:.1$}", "aaaaaaaaaaaaaaaaaa", 4), "aaaa");
134 t!(format!("{:.a$}", "aaaaaaaaaaaaaaaaaa", a=4), "aaaa");
135 t!(format!("{:1$}", "a", 4), "a ");
136 t!(format!("{1:0$}", 4, "a"), "a ");
137 t!(format!("{:a$}", "a", a=4), "a ");
138 t!(format!("{:-#}", "a"), "a");
139 t!(format!("{:+#}", "a"), "a");
140 t!(format!("{:/^10.8}", "1234567890"), "/12345678/");
143 t!(format!("{:}", 1.0f32), "1");
144 t!(format!("{:}", 1.0f64), "1");
145 t!(format!("{:.3}", 1.0f64), "1.000");
146 t!(format!("{:10.3}", 1.0f64), " 1.000");
147 t!(format!("{:+10.3}", 1.0f64), " +1.000");
148 t!(format!("{:+10.3}", -1.0f64), " -1.000");
150 t!(format!("{:e}", 1.2345e6f32), "1.2345e6");
151 t!(format!("{:e}", 1.2345e6f64), "1.2345e6");
152 t!(format!("{:E}", 1.2345e6f64), "1.2345E6");
153 t!(format!("{:.3e}", 1.2345e6f64), "1.234e6");
154 t!(format!("{:10.3e}", 1.2345e6f64), " 1.234e6");
155 t!(format!("{:+10.3e}", 1.2345e6f64), " +1.234e6");
156 t!(format!("{:+10.3e}", -1.2345e6f64), " -1.234e6");
159 t!(format!("{}", -0.0), "0");
160 t!(format!("{:?}", -0.0), "-0");
161 t!(format!("{:?}", 0.0), "0");
164 // Ergonomic format_args!
165 t!(format!("{0:x} {0:X}", 15), "f F");
166 t!(format!("{0:x} {0:X} {}", 15), "f F 15");
167 // NOTE: For now the longer test cases must not be followed immediately by
168 // >1 empty lines, or the pretty printer will break. Since no one wants to
169 // touch the current pretty printer (#751), we have no choice but to work
170 // around it. Some of the following test cases are also affected.
171 t!(format!("{:x}{0:X}{a:x}{:X}{1:x}{a:X}", 13, 14, a=15), "dDfEeF");
172 t!(format!("{a:x} {a:X}", a=15), "f F");
174 // And its edge cases
175 t!(format!("{a:.0$} {b:.0$} {0:.0$}\n{a:.c$} {b:.c$} {c:.c$}",
176 4, a="abcdefg", b="hijklmn", c=3),
177 "abcd hijk 4\nabc hij 3");
178 t!(format!("{a:.*} {0} {:.*}", 4, 3, "efgh", a="abcdef"), "abcd 4 efg");
179 t!(format!("{:.a$} {a} {a:#x}", "aaaaaa", a=2), "aa 2 0x2");
182 // Test that pointers don't get truncated.
184 let val = usize::MAX;
185 let exp = format!("{:#x}", val);
186 t!(format!("{:p}", val as *const isize), exp);
190 t!(format!("{{"), "{");
191 t!(format!("}}"), "}");
198 // make sure that format! doesn't move out of local variables
199 let a: Box<_> = box 3;
203 // make sure that format! doesn't cause spurious unused-unsafe warnings when
204 // it's inside of an outer unsafe block
206 let a: isize = ::std::mem::transmute(3_usize);
212 // test that trailing commas are acceptable
213 format!("{}", "test",);
214 format!("{foo}", foo="test",);
217 // Basic test to make sure that we can invoke the `write!` macro with an
218 // fmt::Write instance.
221 let mut buf = String::new();
222 write!(&mut buf, "{}", 3);
225 write!(w, "{foo}", foo=4);
226 write!(w, "{}", "hello");
227 writeln!(w, "{}", "line");
228 writeln!(w, "{foo}", foo="bar");
233 t!(buf, "34helloline\nbar\n☃str");
236 // Just make sure that the macros are defined, there's not really a lot that we
237 // can do with them just yet (to test the output)
240 print!("{:?}", vec![0u8]);
242 println!("this is a {}", "test");
243 println!("{foo}", foo="bar");
246 // Just make sure that the macros are defined, there's not really a lot that we
247 // can do with them just yet (to test the output)
248 fn test_format_args() {
250 let mut buf = String::new();
253 write!(w, "{}", format_args!("{}", 1));
254 write!(w, "{}", format_args!("test"));
255 write!(w, "{}", format_args!("{test}", test=3));
260 let s = fmt::format(format_args!("hello {}", "world"));
261 t!(s, "hello world");
262 let s = format!("{}: {}", "args were", format_args!("hello {}", "world"));
263 t!(s, "args were: hello world");
267 // Make sure format!() arguments are always evaluated in a left-to-right
270 static mut FOO: isize = 0;
276 assert_eq!(format!("{} {} {a} {b} {} {c}",
277 foo(), foo(), foo(), a=foo(), b=foo(), c=foo()),
278 "1 2 4 5 3 6".to_string());
282 // Make sure each argument are evaluted only once even though it may be
283 // formatted multiple times
285 static mut FOO: isize = 0;
291 assert_eq!(format!("{0} {0} {0} {a} {a} {a}", foo(), a=foo()),
292 "1 1 1 2 2 2".to_string());