249 lines
7.8 KiB
Rust
249 lines
7.8 KiB
Rust
// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// no-pretty-expanded unnecessary unsafe block generated
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#![deny(warnings)]
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#![allow(unused_must_use)]
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#![allow(unknown_features)]
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#![feature(box_syntax)]
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use std::fmt;
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use std::usize;
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struct A;
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struct B;
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struct C;
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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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macro_rules! t {
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($a:expr, $b:expr) => { assert_eq!($a, $b) }
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}
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pub fn main() {
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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!("{:?}", '☃'), "'\\u{2603}'");
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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!("{: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}", 0x1234 as *const isize), "0x00001234");
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t!(format!("{:#p}", 0x1234 as *mut isize), "0x00001234");
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} else {
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t!(format!("{:#p}", 0x1234 as *const isize), "0x0000000000001234");
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t!(format!("{:#p}", 0x1234 as *mut isize), "0x0000000000001234");
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}
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t!(format!("{:p}", 0x1234 as *const isize), "0x1234");
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t!(format!("{:p}", 0x1234 as *mut isize), "0x1234");
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t!(format!("{:x}", A), "aloha");
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t!(format!("{:X}", B), "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_bar}", foo_bar=1), "1");
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t!(format!("{}", 5 + 5), "10");
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t!(format!("{:#4}", C), "☃123");
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let a: &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$}", "aaaaaaaaaaaaaaaaaa", a=4), "aaaa");
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t!(format!("{:1$}", "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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// 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");
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t!(format!("{:?}", 0.0), "0");
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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!("{:#x}", val);
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t!(format!("{:p}", val as *const isize), 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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test_write();
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test_print();
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test_order();
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// make sure that format! doesn't move out of local variables
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let a: Box<_> = box 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_format_args();
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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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fn test_write() {
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use std::fmt::Write;
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let mut buf = String::new();
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write!(&mut buf, "{}", 3);
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{
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let w = &mut buf;
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write!(w, "{foo}", foo=4);
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write!(w, "{}", "hello");
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writeln!(w, "{}", "line");
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writeln!(w, "{foo}", foo="bar");
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w.write_char('☃');
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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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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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fn test_format_args() {
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use std::fmt::Write;
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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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write!(w, "{}", format_args!("{}", 1));
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write!(w, "{}", format_args!("test"));
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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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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!(format!("{} {} {a} {b} {} {c}",
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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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