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authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
commita990de90fe41456a23e58bd087d2f107d321f3a1 (patch)
tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/cfg-if/src/lib.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.zip
Deleted vendor folder
Diffstat (limited to 'vendor/cfg-if/src/lib.rs')
-rw-r--r--vendor/cfg-if/src/lib.rs176
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diff --git a/vendor/cfg-if/src/lib.rs b/vendor/cfg-if/src/lib.rs
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--- a/vendor/cfg-if/src/lib.rs
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-//! A macro for defining `#[cfg]` if-else statements.
-//!
-//! The macro provided by this crate, `cfg_if`, is similar to the `if/elif` C
-//! preprocessor macro by allowing definition of a cascade of `#[cfg]` cases,
-//! emitting the implementation which matches first.
-//!
-//! This allows you to conveniently provide a long list `#[cfg]`'d blocks of code
-//! without having to rewrite each clause multiple times.
-//!
-//! # Example
-//!
-//! ```
-//! cfg_if::cfg_if! {
-//! if #[cfg(unix)] {
-//! fn foo() { /* unix specific functionality */ }
-//! } else if #[cfg(target_pointer_width = "32")] {
-//! fn foo() { /* non-unix, 32-bit functionality */ }
-//! } else {
-//! fn foo() { /* fallback implementation */ }
-//! }
-//! }
-//!
-//! # fn main() {}
-//! ```
-
-#![no_std]
-#![doc(html_root_url = "https://docs.rs/cfg-if")]
-#![deny(missing_docs)]
-#![cfg_attr(test, deny(warnings))]
-
-/// The main macro provided by this crate. See crate documentation for more
-/// information.
-#[macro_export]
-macro_rules! cfg_if {
- // match if/else chains with a final `else`
- ($(
- if #[cfg($meta:meta)] { $($tokens:tt)* }
- ) else * else {
- $($tokens2:tt)*
- }) => {
- $crate::cfg_if! {
- @__items
- () ;
- $( ( ($meta) ($($tokens)*) ), )*
- ( () ($($tokens2)*) ),
- }
- };
-
- // match if/else chains lacking a final `else`
- (
- if #[cfg($i_met:meta)] { $($i_tokens:tt)* }
- $(
- else if #[cfg($e_met:meta)] { $($e_tokens:tt)* }
- )*
- ) => {
- $crate::cfg_if! {
- @__items
- () ;
- ( ($i_met) ($($i_tokens)*) ),
- $( ( ($e_met) ($($e_tokens)*) ), )*
- ( () () ),
- }
- };
-
- // Internal and recursive macro to emit all the items
- //
- // Collects all the negated cfgs in a list at the beginning and after the
- // semicolon is all the remaining items
- (@__items ($($not:meta,)*) ; ) => {};
- (@__items ($($not:meta,)*) ; ( ($($m:meta),*) ($($tokens:tt)*) ), $($rest:tt)*) => {
- // Emit all items within one block, applying an appropriate #[cfg]. The
- // #[cfg] will require all `$m` matchers specified and must also negate
- // all previous matchers.
- #[cfg(all($($m,)* not(any($($not),*))))] $crate::cfg_if! { @__identity $($tokens)* }
-
- // Recurse to emit all other items in `$rest`, and when we do so add all
- // our `$m` matchers to the list of `$not` matchers as future emissions
- // will have to negate everything we just matched as well.
- $crate::cfg_if! { @__items ($($not,)* $($m,)*) ; $($rest)* }
- };
-
- // Internal macro to make __apply work out right for different match types,
- // because of how macros matching/expand stuff.
- (@__identity $($tokens:tt)*) => {
- $($tokens)*
- };
-}
-
-#[cfg(test)]
-mod tests {
- cfg_if! {
- if #[cfg(test)] {
- use core::option::Option as Option2;
- fn works1() -> Option2<u32> { Some(1) }
- } else {
- fn works1() -> Option<u32> { None }
- }
- }
-
- cfg_if! {
- if #[cfg(foo)] {
- fn works2() -> bool { false }
- } else if #[cfg(test)] {
- fn works2() -> bool { true }
- } else {
- fn works2() -> bool { false }
- }
- }
-
- cfg_if! {
- if #[cfg(foo)] {
- fn works3() -> bool { false }
- } else {
- fn works3() -> bool { true }
- }
- }
-
- cfg_if! {
- if #[cfg(test)] {
- use core::option::Option as Option3;
- fn works4() -> Option3<u32> { Some(1) }
- }
- }
-
- cfg_if! {
- if #[cfg(foo)] {
- fn works5() -> bool { false }
- } else if #[cfg(test)] {
- fn works5() -> bool { true }
- }
- }
-
- #[test]
- fn it_works() {
- assert!(works1().is_some());
- assert!(works2());
- assert!(works3());
- assert!(works4().is_some());
- assert!(works5());
- }
-
- #[test]
- #[allow(clippy::assertions_on_constants)]
- fn test_usage_within_a_function() {
- cfg_if! {if #[cfg(debug_assertions)] {
- // we want to put more than one thing here to make sure that they
- // all get configured properly.
- assert!(cfg!(debug_assertions));
- assert_eq!(4, 2+2);
- } else {
- assert!(works1().is_some());
- assert_eq!(10, 5+5);
- }}
- }
-
- trait Trait {
- fn blah(&self);
- }
-
- #[allow(dead_code)]
- struct Struct;
-
- impl Trait for Struct {
- cfg_if! {
- if #[cfg(feature = "blah")] {
- fn blah(&self) {
- unimplemented!();
- }
- } else {
- fn blah(&self) {
- unimplemented!();
- }
- }
- }
- }
-}