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//! Convenience macros.
use std::{
fmt, mem, panic,
sync::atomic::{AtomicUsize, Ordering::SeqCst},
};
#[macro_export]
macro_rules! eprintln {
($($tt:tt)*) => {{
if $crate::is_ci() {
panic!("Forgot to remove debug-print?")
}
std::eprintln!($($tt)*)
}}
}
/// Appends formatted string to a `String`.
#[macro_export]
macro_rules! format_to {
($buf:expr) => ();
($buf:expr, $lit:literal $($arg:tt)*) => {
{ use ::std::fmt::Write as _; let _ = ::std::write!($buf, $lit $($arg)*); }
};
}
/// Generates `From` impls for `Enum E { Foo(Foo), Bar(Bar) }` enums
///
/// # Example
///
/// ```rust
/// impl_from!(Struct, Union, Enum for Adt);
/// ```
#[macro_export]
macro_rules! impl_from {
($($variant:ident $(($($sub_variant:ident),*))?),* for $enum:ident) => {
$(
impl From<$variant> for $enum {
fn from(it: $variant) -> $enum {
$enum::$variant(it)
}
}
$($(
impl From<$sub_variant> for $enum {
fn from(it: $sub_variant) -> $enum {
$enum::$variant($variant::$sub_variant(it))
}
}
)*)?
)*
}
}
/// A version of `assert!` macro which allows to handle an assertion failure.
///
/// In release mode, it returns the condition and logs an error.
///
/// ```
/// if assert_never!(impossible) {
/// // Heh, this shouldn't have happened, but lets try to soldier on...
/// return None;
/// }
/// ```
///
/// Rust analyzer is a long-running process, and crashing really isn't an option.
///
/// Shamelessly stolen from: https://www.sqlite.org/assert.html
#[macro_export]
macro_rules! assert_never {
($cond:expr) => { $crate::assert_always!($cond, "") };
($cond:expr, $($fmt:tt)*) => {{
let value = $cond;
if value {
$crate::on_assert_failure(
format_args!($($fmt)*)
);
}
value
}};
}
type AssertHook = fn(&panic::Location<'_>, fmt::Arguments<'_>);
static HOOK: AtomicUsize = AtomicUsize::new(0);
pub fn set_assert_hook(hook: AssertHook) {
HOOK.store(hook as usize, SeqCst);
}
#[cold]
#[track_caller]
pub fn on_assert_failure(args: fmt::Arguments) {
let hook: usize = HOOK.load(SeqCst);
if hook == 0 {
panic!("\n assertion failed: {}\n", args);
}
let hook: AssertHook = unsafe { mem::transmute::<usize, AssertHook>(hook) };
hook(panic::Location::caller(), args)
}
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