mirror of
https://github.com/rust-lang/rust.git
synced 2025-11-03 22:49:17 +00:00
325 lines
10 KiB
Rust
325 lines
10 KiB
Rust
#![deny(warnings)]
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use std::cell::RefCell;
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use std::fmt::{self, Write};
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use std::ptr;
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#[test]
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fn test_format() {
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let s = fmt::format(format_args!("Hello, {}!", "world"));
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assert_eq!(s, "Hello, world!");
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}
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struct A;
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struct B;
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struct C;
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struct D;
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impl fmt::LowerHex for A {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.write_str("aloha")
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}
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}
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impl fmt::UpperHex for B {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.write_str("adios")
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}
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}
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impl fmt::Display for C {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.pad_integral(true, "☃", "123")
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}
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}
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impl fmt::Binary for D {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.write_str("aa")?;
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f.write_char('☃')?;
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f.write_str("bb")
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}
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}
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macro_rules! t {
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($a:expr, $b:expr) => {
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assert_eq!($a, $b)
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};
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}
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#[test]
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fn test_format_macro_interface() {
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// Various edge cases without formats
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t!(format!(""), "");
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t!(format!("hello"), "hello");
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t!(format!("hello {{"), "hello {");
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// default formatters should work
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t!(format!("{}", 1.0f32), "1");
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t!(format!("{}", 1.0f64), "1");
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t!(format!("{}", "a"), "a");
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t!(format!("{}", "a".to_string()), "a");
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t!(format!("{}", false), "false");
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t!(format!("{}", 'a'), "a");
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// At least exercise all the formats
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t!(format!("{}", true), "true");
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t!(format!("{}", '☃'), "☃");
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t!(format!("{}", 10), "10");
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t!(format!("{}", 10_usize), "10");
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t!(format!("{:?}", '☃'), "'☃'");
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t!(format!("{:?}", 10), "10");
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t!(format!("{:?}", 10_usize), "10");
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t!(format!("{:?}", "true"), "\"true\"");
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t!(format!("{:?}", "foo\nbar"), "\"foo\\nbar\"");
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t!(format!("{:?}", "foo\n\"bar\"\r\n\'baz\'\t\\qux\\"), r#""foo\n\"bar\"\r\n'baz'\t\\qux\\""#);
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t!(format!("{:?}", "foo\0bar\x01baz\u{7f}q\u{75}x"), r#""foo\0bar\u{1}baz\u{7f}qux""#);
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t!(format!("{:o}", 10_usize), "12");
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t!(format!("{:x}", 10_usize), "a");
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t!(format!("{:X}", 10_usize), "A");
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t!(format!("{}", "foo"), "foo");
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t!(format!("{}", "foo".to_string()), "foo");
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if cfg!(target_pointer_width = "32") {
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t!(format!("{:#p}", ptr::invalid::<isize>(0x1234)), "0x00001234");
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t!(format!("{:#p}", ptr::invalid_mut::<isize>(0x1234)), "0x00001234");
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} else {
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t!(format!("{:#p}", ptr::invalid::<isize>(0x1234)), "0x0000000000001234");
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t!(format!("{:#p}", ptr::invalid_mut::<isize>(0x1234)), "0x0000000000001234");
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}
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t!(format!("{:p}", ptr::invalid::<isize>(0x1234)), "0x1234");
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t!(format!("{:p}", ptr::invalid_mut::<isize>(0x1234)), "0x1234");
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t!(format!("{A:x}"), "aloha");
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t!(format!("{B:X}"), "adios");
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t!(format!("foo {} ☃☃☃☃☃☃", "bar"), "foo bar ☃☃☃☃☃☃");
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t!(format!("{1} {0}", 0, 1), "1 0");
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t!(format!("{foo} {bar}", foo = 0, bar = 1), "0 1");
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t!(format!("{foo} {1} {bar} {0}", 0, 1, foo = 2, bar = 3), "2 1 3 0");
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t!(format!("{} {0}", "a"), "a a");
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t!(format!("{_foo}", _foo = 6usize), "6");
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t!(format!("{foo_bar}", foo_bar = 1), "1");
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t!(format!("{}", 5 + 5), "10");
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t!(format!("{C:#4}"), "☃123");
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t!(format!("{D:b}"), "aa☃bb");
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let a: &dyn fmt::Debug = &1;
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t!(format!("{a:?}"), "1");
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// Formatting strings and their arguments
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t!(format!("{}", "a"), "a");
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t!(format!("{:4}", "a"), "a ");
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t!(format!("{:4}", "☃"), "☃ ");
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t!(format!("{:>4}", "a"), " a");
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t!(format!("{:<4}", "a"), "a ");
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t!(format!("{:^5}", "a"), " a ");
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t!(format!("{:^5}", "aa"), " aa ");
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t!(format!("{:^4}", "a"), " a ");
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t!(format!("{:^4}", "aa"), " aa ");
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t!(format!("{:.4}", "a"), "a");
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t!(format!("{:4.4}", "a"), "a ");
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t!(format!("{:4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
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t!(format!("{:<4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
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t!(format!("{:>4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
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t!(format!("{:^4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
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t!(format!("{:>10.4}", "aaaaaaaaaaaaaaaaaa"), " aaaa");
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t!(format!("{:2.4}", "aaaaa"), "aaaa");
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t!(format!("{:2.4}", "aaaa"), "aaaa");
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t!(format!("{:2.4}", "aaa"), "aaa");
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t!(format!("{:2.4}", "aa"), "aa");
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t!(format!("{:2.4}", "a"), "a ");
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t!(format!("{:0>2}", "a"), "0a");
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t!(format!("{:.*}", 4, "aaaaaaaaaaaaaaaaaa"), "aaaa");
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t!(format!("{:.1$}", "aaaaaaaaaaaaaaaaaa", 4), "aaaa");
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t!(format!("{:.a$}", "aaaaaaaaaaaaaaaaaa", a = 4), "aaaa");
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t!(format!("{:._a$}", "aaaaaaaaaaaaaaaaaa", _a = 4), "aaaa");
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t!(format!("{:1$}", "a", 4), "a ");
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t!(format!("{1:0$}", 4, "a"), "a ");
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t!(format!("{:a$}", "a", a = 4), "a ");
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t!(format!("{:-#}", "a"), "a");
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t!(format!("{:+#}", "a"), "a");
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t!(format!("{:/^10.8}", "1234567890"), "/12345678/");
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// Some float stuff
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t!(format!("{:}", 1.0f32), "1");
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t!(format!("{:}", 1.0f64), "1");
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t!(format!("{:.3}", 1.0f64), "1.000");
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t!(format!("{:10.3}", 1.0f64), " 1.000");
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t!(format!("{:+10.3}", 1.0f64), " +1.000");
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t!(format!("{:+10.3}", -1.0f64), " -1.000");
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t!(format!("{:e}", 1.2345e6f32), "1.2345e6");
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t!(format!("{:e}", 1.2345e6f64), "1.2345e6");
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t!(format!("{:E}", 1.2345e6f64), "1.2345E6");
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t!(format!("{:.3e}", 1.2345e6f64), "1.234e6");
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t!(format!("{:10.3e}", 1.2345e6f64), " 1.234e6");
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t!(format!("{:+10.3e}", 1.2345e6f64), " +1.234e6");
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t!(format!("{:+10.3e}", -1.2345e6f64), " -1.234e6");
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// Float edge cases
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t!(format!("{}", -0.0), "-0");
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t!(format!("{:?}", 0.0), "0.0");
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// sign aware zero padding
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t!(format!("{:<3}", 1), "1 ");
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t!(format!("{:>3}", 1), " 1");
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t!(format!("{:^3}", 1), " 1 ");
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t!(format!("{:03}", 1), "001");
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t!(format!("{:<03}", 1), "001");
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t!(format!("{:>03}", 1), "001");
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t!(format!("{:^03}", 1), "001");
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t!(format!("{:+03}", 1), "+01");
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t!(format!("{:<+03}", 1), "+01");
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t!(format!("{:>+03}", 1), "+01");
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t!(format!("{:^+03}", 1), "+01");
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t!(format!("{:#05x}", 1), "0x001");
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t!(format!("{:<#05x}", 1), "0x001");
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t!(format!("{:>#05x}", 1), "0x001");
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t!(format!("{:^#05x}", 1), "0x001");
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t!(format!("{:05}", 1.2), "001.2");
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t!(format!("{:<05}", 1.2), "001.2");
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t!(format!("{:>05}", 1.2), "001.2");
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t!(format!("{:^05}", 1.2), "001.2");
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t!(format!("{:05}", -1.2), "-01.2");
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t!(format!("{:<05}", -1.2), "-01.2");
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t!(format!("{:>05}", -1.2), "-01.2");
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t!(format!("{:^05}", -1.2), "-01.2");
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t!(format!("{:+05}", 1.2), "+01.2");
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t!(format!("{:<+05}", 1.2), "+01.2");
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t!(format!("{:>+05}", 1.2), "+01.2");
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t!(format!("{:^+05}", 1.2), "+01.2");
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// Ergonomic format_args!
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t!(format!("{0:x} {0:X}", 15), "f F");
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t!(format!("{0:x} {0:X} {}", 15), "f F 15");
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t!(format!("{:x}{0:X}{a:x}{:X}{1:x}{a:X}", 13, 14, a = 15), "dDfEeF");
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t!(format!("{a:x} {a:X}", a = 15), "f F");
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// And its edge cases
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t!(
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format!(
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"{a:.0$} {b:.0$} {0:.0$}\n{a:.c$} {b:.c$} {c:.c$}",
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4,
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a = "abcdefg",
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b = "hijklmn",
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c = 3
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),
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"abcd hijk 4\nabc hij 3"
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);
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t!(format!("{a:.*} {0} {:.*}", 4, 3, "efgh", a = "abcdef"), "abcd 4 efg");
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t!(format!("{:.a$} {a} {a:#x}", "aaaaaa", a = 2), "aa 2 0x2");
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// Test that pointers don't get truncated.
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{
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let val = usize::MAX;
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let exp = format!("{val:#x}");
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t!(format!("{:p}", std::ptr::invalid::<isize>(val)), exp);
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}
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// Escaping
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t!(format!("{{"), "{");
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t!(format!("}}"), "}");
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// make sure that format! doesn't move out of local variables
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let a = Box::new(3);
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format!("{a}");
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format!("{a}");
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// make sure that format! doesn't cause spurious unused-unsafe warnings when
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// it's inside of an outer unsafe block
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unsafe {
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let a: isize = ::std::mem::transmute(3_usize);
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format!("{a}");
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}
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// test that trailing commas are acceptable
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format!("{}", "test",);
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format!("{foo}", foo = "test",);
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}
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// Basic test to make sure that we can invoke the `write!` macro with an
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// fmt::Write instance.
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#[test]
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fn test_write() {
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let mut buf = String::new();
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let _ = write!(&mut buf, "{}", 3);
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{
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let w = &mut buf;
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let _ = write!(w, "{foo}", foo = 4);
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let _ = write!(w, "{}", "hello");
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let _ = writeln!(w, "{}", "line");
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let _ = writeln!(w, "{foo}", foo = "bar");
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let _ = w.write_char('☃');
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let _ = w.write_str("str");
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}
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t!(buf, "34helloline\nbar\n☃str");
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}
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// Just make sure that the macros are defined, there's not really a lot that we
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// can do with them just yet (to test the output)
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#[test]
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fn test_print() {
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print!("hi");
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print!("{:?}", vec![0u8]);
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println!("hello");
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println!("this is a {}", "test");
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println!("{foo}", foo = "bar");
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}
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// Just make sure that the macros are defined, there's not really a lot that we
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// can do with them just yet (to test the output)
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#[test]
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fn test_format_args() {
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let mut buf = String::new();
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{
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let w = &mut buf;
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let _ = write!(w, "{}", format_args!("{}", 1));
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let _ = write!(w, "{}", format_args!("test"));
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let _ = write!(w, "{}", format_args!("{test}", test = 3));
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}
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let s = buf;
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t!(s, "1test3");
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let s = fmt::format(format_args!("hello {}", "world"));
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t!(s, "hello world");
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let s = format!("{}: {}", "args were", format_args!("hello {}", "world"));
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t!(s, "args were: hello world");
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}
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#[test]
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fn test_order() {
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// Make sure format!() arguments are always evaluated in a left-to-right
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// ordering
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fn foo() -> isize {
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static mut FOO: isize = 0;
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unsafe {
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FOO += 1;
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FOO
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}
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}
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assert_eq!(
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format!("{} {} {a} {b} {} {c}", foo(), foo(), foo(), a = foo(), b = foo(), c = foo()),
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"1 2 4 5 3 6".to_string()
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);
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}
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#[test]
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fn test_once() {
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// Make sure each argument are evaluated only once even though it may be
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// formatted multiple times
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fn foo() -> isize {
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static mut FOO: isize = 0;
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unsafe {
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FOO += 1;
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FOO
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}
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}
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assert_eq!(format!("{0} {0} {0} {a} {a} {a}", foo(), a = foo()), "1 1 1 2 2 2".to_string());
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}
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#[test]
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fn test_refcell() {
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let refcell = RefCell::new(5);
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assert_eq!(format!("{refcell:?}"), "RefCell { value: 5 }");
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let borrow = refcell.borrow_mut();
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assert_eq!(format!("{refcell:?}"), "RefCell { value: <borrowed> }");
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drop(borrow);
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assert_eq!(format!("{refcell:?}"), "RefCell { value: 5 }");
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}
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