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Improve reify! syntax.

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This commit is contained in:
Stephen Chung
2022-12-09 16:41:01 +08:00
parent 3d5908480a
commit 30ff208104
9 changed files with 64 additions and 68 deletions
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30
src/reify.rs
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@@ -4,12 +4,12 @@
///
/// # Syntax
///
/// * `reify!(`_variable_ or _expression_`,|`_temp-variable_`: `_type_`|` _code_`,` `||` _fallback_ `)`
/// * `reify!(`_variable_ or _expression_`,|`_temp-variable_`: `_type_`|` _code_ `)`
/// * `reify!(`_variable_ or _expression_ `=>` `Option<`_type_`>` `)`
/// * `reify!(`_variable_ or _expression_ `=>` _type_ `)`
/// * `reify! { `_variable_ or _expression_` => |`_temp-variable_`: `_type_`|` _code_`,` `||` _fallback_ `)`
/// * `reify! { `_variable_ or _expression_` => |`_temp-variable_`: `_type_`|` _code_ `)`
/// * `reify! { `_variable_ or _expression_ `=>` `Option<`_type_`>` `)`
/// * `reify! { `_variable_ or _expression_ `=>` _type_ `)`
macro_rules! reify {
($old:ident, |$new:ident : $t:ty| $code:expr, || $fallback:expr) => {{
($old:ident => |$new:ident : $t:ty| $code:expr, || $fallback:expr) => {{
#[allow(clippy::redundant_else)]
if std::any::TypeId::of::<$t>() == std::any::Any::type_id(&$old) {
// SAFETY: This is safe because we already checked to make sure the two types
@@ -20,29 +20,29 @@ macro_rules! reify {
$fallback
}
}};
($old:expr, |$new:ident : $t:ty| $code:expr, || $fallback:expr) => {{
($old:expr => |$new:ident : $t:ty| $code:expr, || $fallback:expr) => {{
let old = $old;
reify!(old, |$new: $t| $code, || $fallback)
reify! { old => |$new: $t| $code, || $fallback }
}};
($old:ident, |$new:ident : $t:ty| $code:expr) => {
reify!($old, |$new: $t| $code, || ())
($old:ident => |$new:ident : $t:ty| $code:expr) => {
reify! { $old => |$new: $t| $code, || () }
};
($old:expr, |$new:ident : $t:ty| $code:expr) => {
reify!($old, |$new: $t| $code, || ())
($old:expr => |$new:ident : $t:ty| $code:expr) => {
reify! { $old => |$new: $t| $code, || () }
};
($old:ident => Option<$t:ty>) => {
reify!($old, |v: $t| Some(v), || None)
reify! { $old => |v: $t| Some(v), || None }
};
($old:expr => Option<$t:ty>) => {
reify!($old, |v: $t| Some(v), || None)
reify! { $old => |v: $t| Some(v), || None }
};
($old:ident => $t:ty) => {
reify!($old, |v: $t| v, || unreachable!())
reify! { $old => |v: $t| v, || unreachable!() }
};
($old:expr => $t:ty) => {
reify!($old, |v: $t| v, || unreachable!())
reify! { $old => |v: $t| v, || unreachable!() }
};
}