4af3494bb0
This commit applies the stabilization of std::fmt as outlined in [RFC 380][rfc]. There are a number of breaking changes as a part of this commit which will need to be handled to migrated old code: * A number of formatting traits have been removed: String, Bool, Char, Unsigned, Signed, and Float. It is recommended to instead use Show wherever possible or to use adaptor structs to implement other methods of formatting. * The format specifier for Boolean has changed from `t` to `b`. * The enum `FormatError` has been renamed to `Error` as well as becoming a unit struct instead of an enum. The `WriteError` variant no longer exists. * The `format_args_method!` macro has been removed with no replacement. Alter code to use the `format_args!` macro instead. * The public fields of a `Formatter` have become read-only with no replacement. Use a new formatting string to alter the formatting flags in combination with the `write!` macro. The fields can be accessed through accessor methods on the `Formatter` structure. Other than these breaking changes, the contents of std::fmt should now also all contain stability markers. Most of them are still #[unstable] or #[experimental] [rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0380-stabilize-std-fmt.md [breaking-change] Closes #18904
127 lines
3.8 KiB
Rust
127 lines
3.8 KiB
Rust
// Copyright 2014 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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#![macro_escape]
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/// Entry point of task panic, for details, see std::macros
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#[macro_export]
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macro_rules! panic(
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() => (
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panic!("{}", "explicit panic")
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);
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($msg:expr) => ({
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static _MSG_FILE_LINE: (&'static str, &'static str, uint) = ($msg, file!(), line!());
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::core::panicking::panic(&_MSG_FILE_LINE)
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});
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($fmt:expr, $($arg:tt)*) => ({
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// a closure can't have return type !, so we need a full
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// function to pass to format_args!, *and* we need the
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// file and line numbers right here; so an inner bare fn
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// is our only choice.
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//
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// LLVM doesn't tend to inline this, presumably because begin_unwind_fmt
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// is #[cold] and #[inline(never)] and because this is flagged as cold
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// as returning !. We really do want this to be inlined, however,
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// because it's just a tiny wrapper. Small wins (156K to 149K in size)
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// were seen when forcing this to be inlined, and that number just goes
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// up with the number of calls to panic!()
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//
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// The leading _'s are to avoid dead code warnings if this is
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// used inside a dead function. Just `#[allow(dead_code)]` is
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// insufficient, since the user may have
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// `#[forbid(dead_code)]` and which cannot be overridden.
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#[inline(always)]
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fn _run_fmt(fmt: &::std::fmt::Arguments) -> ! {
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static _FILE_LINE: (&'static str, uint) = (file!(), line!());
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::core::panicking::panic_fmt(fmt, &_FILE_LINE)
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}
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format_args!(_run_fmt, $fmt, $($arg)*)
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});
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)
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/// Runtime assertion, for details see std::macros
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#[macro_export]
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macro_rules! assert(
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($cond:expr) => (
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if !$cond {
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panic!(concat!("assertion failed: ", stringify!($cond)))
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}
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);
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($cond:expr, $($arg:tt)*) => (
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if !$cond {
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panic!($($arg)*)
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}
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);
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)
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/// Runtime assertion, only without `--cfg ndebug`
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#[macro_export]
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macro_rules! debug_assert(
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($(a:tt)*) => ({
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if cfg!(not(ndebug)) {
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assert!($($a)*);
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}
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})
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)
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/// Runtime assertion for equality, for details see std::macros
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#[macro_export]
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macro_rules! assert_eq(
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($cond1:expr, $cond2:expr) => ({
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let c1 = $cond1;
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let c2 = $cond2;
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if c1 != c2 || c2 != c1 {
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panic!("expressions not equal, left: {}, right: {}", c1, c2);
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}
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})
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)
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/// Runtime assertion for equality, only without `--cfg ndebug`
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#[macro_export]
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macro_rules! debug_assert_eq(
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($($a:tt)*) => ({
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if cfg!(not(ndebug)) {
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assert_eq!($($a)*);
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}
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})
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)
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/// Runtime assertion, disableable at compile time
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#[macro_export]
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macro_rules! debug_assert(
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($($arg:tt)*) => (if cfg!(not(ndebug)) { assert!($($arg)*); })
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)
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/// Short circuiting evaluation on Err
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#[macro_export]
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macro_rules! try(
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($e:expr) => (match $e { Ok(e) => e, Err(e) => return Err(e) })
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)
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/// Writing a formatted string into a writer
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#[macro_export]
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macro_rules! write(
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($dst:expr, $($arg:tt)*) => ({
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let dst = &mut *$dst;
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format_args!(|args| { dst.write_fmt(args) }, $($arg)*)
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})
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)
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/// Writing a formatted string plus a newline into a writer
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#[macro_export]
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macro_rules! writeln(
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($dst:expr, $fmt:expr $($arg:tt)*) => (
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write!($dst, concat!($fmt, "\n") $($arg)*)
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)
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)
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#[macro_export]
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macro_rules! unreachable( () => (panic!("unreachable code")) )
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