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Allow for multiple patterns and a guard in assert_matches.

This commit is contained in:
Mara Bos 2021-03-04 18:07:26 +01:00
parent eb18746bc6
commit cfce60ea37
1 changed files with 23 additions and 23 deletions
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46
library/core/src/macros/mod.rs
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@ -110,7 +110,10 @@ macro_rules! assert_ne {
});
}
/// Asserts that an expression matches a pattern.
/// Asserts that an expression matches any of the given patterns.
///
/// Like in a `match` expression, the pattern can be optionally followed by `if`
/// and a guard expression that has access to names bound by the pattern.
///
/// On panic, this macro will print the value of the expression with its
/// debug representation.
@ -125,38 +128,35 @@ macro_rules! assert_ne {
/// let b = 1u32.checked_sub(2);
/// assert_matches!(a, Some(_));
/// assert_matches!(b, None);
///
/// let c = Ok("abc".to_string());
/// assert_matches!(a, Ok(x) | Err(x) if x.len() < 100);
/// ```
#[macro_export]
#[unstable(feature = "assert_matches", issue = "none")]
#[allow_internal_unstable(core_panic)]
macro_rules! assert_matches {
($left:expr, $right:pat $(,)?) => ({
match &$left {
($left:expr, $( $pattern:pat )|+ $( if $guard: expr )? $(,)?) => ({
match $left {
$( $pattern )|+ $( if $guard )? => {}
left_val => {
if let $right = left_val {
// OK
} else {
$crate::panicking::assert_matches_failed(
&*left_val,
$crate::stringify!($right),
$crate::option::Option::None
);
}
$crate::panicking::assert_matches_failed(
&left_val,
$crate::stringify!($($pattern)|+ $(if $guard)?),
$crate::option::Option::None
);
}
}
});
($left:expr, $right:expr, $($arg:tt)+) => ({
match &$left {
($left:expr, $( $pattern:pat )|+ $( if $guard: expr )?, $($arg:tt)+) => ({
match $left {
$( $pattern )|+ $( if $guard )? => {}
left_val => {
if let $right = left_val {
// OK
} else {
$crate::panicking::assert_matches_failed(
&*left_val,
$crate::stringify!($right),
$crate::option::Option::Some($crate::format_args!($($arg)+))
);
}
$crate::panicking::assert_matches_failed(
&left_val,
$crate::stringify!($($pattern)|+ $(if $guard)?),
$crate::option::Option::Some($crate::format_args!($($arg)+))
);
}
}
});