mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-31 13:04:42 +00:00
324 lines
10 KiB
Rust
324 lines
10 KiB
Rust
#![deny(warnings)]
|
|
|
|
use std::cell::RefCell;
|
|
use std::fmt::{self, Write};
|
|
|
|
#[test]
|
|
fn test_format() {
|
|
let s = fmt::format(format_args!("Hello, {}!", "world"));
|
|
assert_eq!(s, "Hello, world!");
|
|
}
|
|
|
|
struct A;
|
|
struct B;
|
|
struct C;
|
|
struct D;
|
|
|
|
impl fmt::LowerHex for A {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
f.write_str("aloha")
|
|
}
|
|
}
|
|
impl fmt::UpperHex for B {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
f.write_str("adios")
|
|
}
|
|
}
|
|
impl fmt::Display for C {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
f.pad_integral(true, "☃", "123")
|
|
}
|
|
}
|
|
impl fmt::Binary for D {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
f.write_str("aa")?;
|
|
f.write_char('☃')?;
|
|
f.write_str("bb")
|
|
}
|
|
}
|
|
|
|
macro_rules! t {
|
|
($a:expr, $b:expr) => {
|
|
assert_eq!($a, $b)
|
|
};
|
|
}
|
|
|
|
#[test]
|
|
fn test_format_macro_interface() {
|
|
// Various edge cases without formats
|
|
t!(format!(""), "");
|
|
t!(format!("hello"), "hello");
|
|
t!(format!("hello {{"), "hello {");
|
|
|
|
// default formatters should work
|
|
t!(format!("{}", 1.0f32), "1");
|
|
t!(format!("{}", 1.0f64), "1");
|
|
t!(format!("{}", "a"), "a");
|
|
t!(format!("{}", "a".to_string()), "a");
|
|
t!(format!("{}", false), "false");
|
|
t!(format!("{}", 'a'), "a");
|
|
|
|
// At least exercise all the formats
|
|
t!(format!("{}", true), "true");
|
|
t!(format!("{}", '☃'), "☃");
|
|
t!(format!("{}", 10), "10");
|
|
t!(format!("{}", 10_usize), "10");
|
|
t!(format!("{:?}", '☃'), "'☃'");
|
|
t!(format!("{:?}", 10), "10");
|
|
t!(format!("{:?}", 10_usize), "10");
|
|
t!(format!("{:?}", "true"), "\"true\"");
|
|
t!(format!("{:?}", "foo\nbar"), "\"foo\\nbar\"");
|
|
t!(format!("{:?}", "foo\n\"bar\"\r\n\'baz\'\t\\qux\\"), r#""foo\n\"bar\"\r\n'baz'\t\\qux\\""#);
|
|
t!(format!("{:?}", "foo\0bar\x01baz\u{7f}q\u{75}x"), r#""foo\0bar\u{1}baz\u{7f}qux""#);
|
|
t!(format!("{:o}", 10_usize), "12");
|
|
t!(format!("{:x}", 10_usize), "a");
|
|
t!(format!("{:X}", 10_usize), "A");
|
|
t!(format!("{}", "foo"), "foo");
|
|
t!(format!("{}", "foo".to_string()), "foo");
|
|
if cfg!(target_pointer_width = "32") {
|
|
t!(format!("{:#p}", 0x1234 as *const isize), "0x00001234");
|
|
t!(format!("{:#p}", 0x1234 as *mut isize), "0x00001234");
|
|
} else {
|
|
t!(format!("{:#p}", 0x1234 as *const isize), "0x0000000000001234");
|
|
t!(format!("{:#p}", 0x1234 as *mut isize), "0x0000000000001234");
|
|
}
|
|
t!(format!("{:p}", 0x1234 as *const isize), "0x1234");
|
|
t!(format!("{:p}", 0x1234 as *mut isize), "0x1234");
|
|
t!(format!("{A:x}"), "aloha");
|
|
t!(format!("{B:X}"), "adios");
|
|
t!(format!("foo {} ☃☃☃☃☃☃", "bar"), "foo bar ☃☃☃☃☃☃");
|
|
t!(format!("{1} {0}", 0, 1), "1 0");
|
|
t!(format!("{foo} {bar}", foo = 0, bar = 1), "0 1");
|
|
t!(format!("{foo} {1} {bar} {0}", 0, 1, foo = 2, bar = 3), "2 1 3 0");
|
|
t!(format!("{} {0}", "a"), "a a");
|
|
t!(format!("{_foo}", _foo = 6usize), "6");
|
|
t!(format!("{foo_bar}", foo_bar = 1), "1");
|
|
t!(format!("{}", 5 + 5), "10");
|
|
t!(format!("{C:#4}"), "☃123");
|
|
t!(format!("{D:b}"), "aa☃bb");
|
|
|
|
let a: &dyn fmt::Debug = &1;
|
|
t!(format!("{a:?}"), "1");
|
|
|
|
// Formatting strings and their arguments
|
|
t!(format!("{}", "a"), "a");
|
|
t!(format!("{:4}", "a"), "a ");
|
|
t!(format!("{:4}", "☃"), "☃ ");
|
|
t!(format!("{:>4}", "a"), " a");
|
|
t!(format!("{:<4}", "a"), "a ");
|
|
t!(format!("{:^5}", "a"), " a ");
|
|
t!(format!("{:^5}", "aa"), " aa ");
|
|
t!(format!("{:^4}", "a"), " a ");
|
|
t!(format!("{:^4}", "aa"), " aa ");
|
|
t!(format!("{:.4}", "a"), "a");
|
|
t!(format!("{:4.4}", "a"), "a ");
|
|
t!(format!("{:4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
|
|
t!(format!("{:<4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
|
|
t!(format!("{:>4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
|
|
t!(format!("{:^4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
|
|
t!(format!("{:>10.4}", "aaaaaaaaaaaaaaaaaa"), " aaaa");
|
|
t!(format!("{:2.4}", "aaaaa"), "aaaa");
|
|
t!(format!("{:2.4}", "aaaa"), "aaaa");
|
|
t!(format!("{:2.4}", "aaa"), "aaa");
|
|
t!(format!("{:2.4}", "aa"), "aa");
|
|
t!(format!("{:2.4}", "a"), "a ");
|
|
t!(format!("{:0>2}", "a"), "0a");
|
|
t!(format!("{:.*}", 4, "aaaaaaaaaaaaaaaaaa"), "aaaa");
|
|
t!(format!("{:.1$}", "aaaaaaaaaaaaaaaaaa", 4), "aaaa");
|
|
t!(format!("{:.a$}", "aaaaaaaaaaaaaaaaaa", a = 4), "aaaa");
|
|
t!(format!("{:._a$}", "aaaaaaaaaaaaaaaaaa", _a = 4), "aaaa");
|
|
t!(format!("{:1$}", "a", 4), "a ");
|
|
t!(format!("{1:0$}", 4, "a"), "a ");
|
|
t!(format!("{:a$}", "a", a = 4), "a ");
|
|
t!(format!("{:-#}", "a"), "a");
|
|
t!(format!("{:+#}", "a"), "a");
|
|
t!(format!("{:/^10.8}", "1234567890"), "/12345678/");
|
|
|
|
// Some float stuff
|
|
t!(format!("{:}", 1.0f32), "1");
|
|
t!(format!("{:}", 1.0f64), "1");
|
|
t!(format!("{:.3}", 1.0f64), "1.000");
|
|
t!(format!("{:10.3}", 1.0f64), " 1.000");
|
|
t!(format!("{:+10.3}", 1.0f64), " +1.000");
|
|
t!(format!("{:+10.3}", -1.0f64), " -1.000");
|
|
|
|
t!(format!("{:e}", 1.2345e6f32), "1.2345e6");
|
|
t!(format!("{:e}", 1.2345e6f64), "1.2345e6");
|
|
t!(format!("{:E}", 1.2345e6f64), "1.2345E6");
|
|
t!(format!("{:.3e}", 1.2345e6f64), "1.234e6");
|
|
t!(format!("{:10.3e}", 1.2345e6f64), " 1.234e6");
|
|
t!(format!("{:+10.3e}", 1.2345e6f64), " +1.234e6");
|
|
t!(format!("{:+10.3e}", -1.2345e6f64), " -1.234e6");
|
|
|
|
// Float edge cases
|
|
t!(format!("{}", -0.0), "-0");
|
|
t!(format!("{:?}", 0.0), "0.0");
|
|
|
|
// sign aware zero padding
|
|
t!(format!("{:<3}", 1), "1 ");
|
|
t!(format!("{:>3}", 1), " 1");
|
|
t!(format!("{:^3}", 1), " 1 ");
|
|
t!(format!("{:03}", 1), "001");
|
|
t!(format!("{:<03}", 1), "001");
|
|
t!(format!("{:>03}", 1), "001");
|
|
t!(format!("{:^03}", 1), "001");
|
|
t!(format!("{:+03}", 1), "+01");
|
|
t!(format!("{:<+03}", 1), "+01");
|
|
t!(format!("{:>+03}", 1), "+01");
|
|
t!(format!("{:^+03}", 1), "+01");
|
|
t!(format!("{:#05x}", 1), "0x001");
|
|
t!(format!("{:<#05x}", 1), "0x001");
|
|
t!(format!("{:>#05x}", 1), "0x001");
|
|
t!(format!("{:^#05x}", 1), "0x001");
|
|
t!(format!("{:05}", 1.2), "001.2");
|
|
t!(format!("{:<05}", 1.2), "001.2");
|
|
t!(format!("{:>05}", 1.2), "001.2");
|
|
t!(format!("{:^05}", 1.2), "001.2");
|
|
t!(format!("{:05}", -1.2), "-01.2");
|
|
t!(format!("{:<05}", -1.2), "-01.2");
|
|
t!(format!("{:>05}", -1.2), "-01.2");
|
|
t!(format!("{:^05}", -1.2), "-01.2");
|
|
t!(format!("{:+05}", 1.2), "+01.2");
|
|
t!(format!("{:<+05}", 1.2), "+01.2");
|
|
t!(format!("{:>+05}", 1.2), "+01.2");
|
|
t!(format!("{:^+05}", 1.2), "+01.2");
|
|
|
|
// Ergonomic format_args!
|
|
t!(format!("{0:x} {0:X}", 15), "f F");
|
|
t!(format!("{0:x} {0:X} {}", 15), "f F 15");
|
|
t!(format!("{:x}{0:X}{a:x}{:X}{1:x}{a:X}", 13, 14, a = 15), "dDfEeF");
|
|
t!(format!("{a:x} {a:X}", a = 15), "f F");
|
|
|
|
// And its edge cases
|
|
t!(
|
|
format!(
|
|
"{a:.0$} {b:.0$} {0:.0$}\n{a:.c$} {b:.c$} {c:.c$}",
|
|
4,
|
|
a = "abcdefg",
|
|
b = "hijklmn",
|
|
c = 3
|
|
),
|
|
"abcd hijk 4\nabc hij 3"
|
|
);
|
|
t!(format!("{a:.*} {0} {:.*}", 4, 3, "efgh", a = "abcdef"), "abcd 4 efg");
|
|
t!(format!("{:.a$} {a} {a:#x}", "aaaaaa", a = 2), "aa 2 0x2");
|
|
|
|
// Test that pointers don't get truncated.
|
|
{
|
|
let val = usize::MAX;
|
|
let exp = format!("{val:#x}");
|
|
t!(format!("{:p}", val as *const isize), exp);
|
|
}
|
|
|
|
// Escaping
|
|
t!(format!("{{"), "{");
|
|
t!(format!("}}"), "}");
|
|
|
|
// make sure that format! doesn't move out of local variables
|
|
let a = Box::new(3);
|
|
format!("{a}");
|
|
format!("{a}");
|
|
|
|
// make sure that format! doesn't cause spurious unused-unsafe warnings when
|
|
// it's inside of an outer unsafe block
|
|
unsafe {
|
|
let a: isize = ::std::mem::transmute(3_usize);
|
|
format!("{a}");
|
|
}
|
|
|
|
// test that trailing commas are acceptable
|
|
format!("{}", "test",);
|
|
format!("{foo}", foo = "test",);
|
|
}
|
|
|
|
// Basic test to make sure that we can invoke the `write!` macro with an
|
|
// fmt::Write instance.
|
|
#[test]
|
|
fn test_write() {
|
|
let mut buf = String::new();
|
|
let _ = write!(&mut buf, "{}", 3);
|
|
{
|
|
let w = &mut buf;
|
|
let _ = write!(w, "{foo}", foo = 4);
|
|
let _ = write!(w, "{}", "hello");
|
|
let _ = writeln!(w, "{}", "line");
|
|
let _ = writeln!(w, "{foo}", foo = "bar");
|
|
let _ = w.write_char('☃');
|
|
let _ = w.write_str("str");
|
|
}
|
|
|
|
t!(buf, "34helloline\nbar\n☃str");
|
|
}
|
|
|
|
// Just make sure that the macros are defined, there's not really a lot that we
|
|
// can do with them just yet (to test the output)
|
|
#[test]
|
|
fn test_print() {
|
|
print!("hi");
|
|
print!("{:?}", vec![0u8]);
|
|
println!("hello");
|
|
println!("this is a {}", "test");
|
|
println!("{foo}", foo = "bar");
|
|
}
|
|
|
|
// Just make sure that the macros are defined, there's not really a lot that we
|
|
// can do with them just yet (to test the output)
|
|
#[test]
|
|
fn test_format_args() {
|
|
let mut buf = String::new();
|
|
{
|
|
let w = &mut buf;
|
|
let _ = write!(w, "{}", format_args!("{}", 1));
|
|
let _ = write!(w, "{}", format_args!("test"));
|
|
let _ = write!(w, "{}", format_args!("{test}", test = 3));
|
|
}
|
|
let s = buf;
|
|
t!(s, "1test3");
|
|
|
|
let s = fmt::format(format_args!("hello {}", "world"));
|
|
t!(s, "hello world");
|
|
let s = format!("{}: {}", "args were", format_args!("hello {}", "world"));
|
|
t!(s, "args were: hello world");
|
|
}
|
|
|
|
#[test]
|
|
fn test_order() {
|
|
// Make sure format!() arguments are always evaluated in a left-to-right
|
|
// ordering
|
|
fn foo() -> isize {
|
|
static mut FOO: isize = 0;
|
|
unsafe {
|
|
FOO += 1;
|
|
FOO
|
|
}
|
|
}
|
|
assert_eq!(
|
|
format!("{} {} {a} {b} {} {c}", foo(), foo(), foo(), a = foo(), b = foo(), c = foo()),
|
|
"1 2 4 5 3 6".to_string()
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_once() {
|
|
// Make sure each argument are evaluated only once even though it may be
|
|
// formatted multiple times
|
|
fn foo() -> isize {
|
|
static mut FOO: isize = 0;
|
|
unsafe {
|
|
FOO += 1;
|
|
FOO
|
|
}
|
|
}
|
|
assert_eq!(format!("{0} {0} {0} {a} {a} {a}", foo(), a = foo()), "1 1 1 2 2 2".to_string());
|
|
}
|
|
|
|
#[test]
|
|
fn test_refcell() {
|
|
let refcell = RefCell::new(5);
|
|
assert_eq!(format!("{refcell:?}"), "RefCell { value: 5 }");
|
|
let borrow = refcell.borrow_mut();
|
|
assert_eq!(format!("{refcell:?}"), "RefCell { value: <borrowed> }");
|
|
drop(borrow);
|
|
assert_eq!(format!("{refcell:?}"), "RefCell { value: 5 }");
|
|
}
|