18b8972029
With relative import of the bitflags crate, the macros would try to fetch nonexistent paths, preventing tests form compiling.
1351 lines
39 KiB
Rust
1351 lines
39 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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// Adapted from the bitflags crate revision 4e762d0
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//! A typesafe bitmask flag generator useful for sets of C-style bitmask flags.
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//! It can be used for creating typesafe wrappers around C APIs.
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//!
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//! The `bitflags!` macro generates a `struct` that manages a set of flags. The
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//! flags should only be defined for integer types, otherwise unexpected type
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//! errors may occur at compile time.
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//!
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//! # Example
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//!
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//! ```
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//! #[macro_use]
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//! extern crate bitflags;
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//!
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//! bitflags! {
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//! struct Flags: u32 {
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//! const A = 0b00000001;
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//! const B = 0b00000010;
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//! const C = 0b00000100;
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//! const ABC = Self::A.bits | Self::B.bits | Self::C.bits;
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//! }
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//! }
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//!
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//! fn main() {
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//! let e1 = Flags::A | Flags::C;
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//! let e2 = Flags::B | Flags::C;
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//! assert_eq!((e1 | e2), Flags::ABC); // union
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//! assert_eq!((e1 & e2), Flags::C); // intersection
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//! assert_eq!((e1 - e2), Flags::A); // set difference
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//! assert_eq!(!e2, Flags::A); // set complement
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//! }
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//! ```
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//!
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//! See [`example_generated::Flags`](./example_generated/struct.Flags.html) for documentation of code
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//! generated by the above `bitflags!` expansion.
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//!
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//! The generated `struct`s can also be extended with type and trait
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//! implementations:
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//!
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//! ```
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//! #[macro_use]
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//! extern crate bitflags;
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//!
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//! use std::fmt;
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//!
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//! bitflags! {
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//! struct Flags: u32 {
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//! const A = 0b00000001;
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//! const B = 0b00000010;
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//! }
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//! }
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//!
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//! impl Flags {
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//! pub fn clear(&mut self) {
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//! self.bits = 0; // The `bits` field can be accessed from within the
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//! // same module where the `bitflags!` macro was invoked.
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//! }
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//! }
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//!
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//! impl fmt::Display for Flags {
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//! fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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//! write!(f, "hi!")
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//! }
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//! }
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//!
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//! fn main() {
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//! let mut flags = Flags::A | Flags::B;
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//! flags.clear();
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//! assert!(flags.is_empty());
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//! assert_eq!(format!("{}", flags), "hi!");
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//! assert_eq!(format!("{:?}", Flags::A | Flags::B), "A | B");
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//! assert_eq!(format!("{:?}", Flags::B), "B");
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//! }
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//! ```
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//!
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//! # Visibility
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//!
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//! The generated struct and its associated flag constants are not exported
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//! out of the current module by default. A definition can be exported out of
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//! the current module by adding `pub` before `flags`:
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//!
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//! ```
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//! #[macro_use]
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//! extern crate bitflags;
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//!
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//! mod example {
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//! bitflags! {
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//! pub struct Flags1: u32 {
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//! const A = 0b00000001;
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//! }
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//! }
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//! bitflags! {
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//! # pub
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//! struct Flags2: u32 {
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//! const B = 0b00000010;
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//! }
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//! }
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//! }
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//!
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//! fn main() {
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//! let flag1 = example::Flags1::A;
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//! let flag2 = example::Flags2::B; // error: const `B` is private
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//! }
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//! ```
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//!
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//! # Attributes
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//!
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//! Attributes can be attached to the generated `struct` by placing them
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//! before the `flags` keyword.
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//!
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//! # Trait implementations
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//!
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//! The `Copy`, `Clone`, `PartialEq`, `Eq`, `PartialOrd`, `Ord` and `Hash`
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//! traits automatically derived for the `struct` using the `derive` attribute.
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//! Additional traits can be derived by providing an explicit `derive`
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//! attribute on `flags`.
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//!
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//! The `Extend` and `FromIterator` traits are implemented for the `struct`,
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//! too: `Extend` adds the union of the instances of the `struct` iterated over,
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//! while `FromIterator` calculates the union.
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//!
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//! The `Binary`, `Debug`, `LowerHex`, `Octal` and `UpperHex` trait is also
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//! implemented by displaying the bits value of the internal struct.
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//!
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//! ## Operators
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//!
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//! The following operator traits are implemented for the generated `struct`:
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//!
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//! - `BitOr` and `BitOrAssign`: union
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//! - `BitAnd` and `BitAndAssign`: intersection
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//! - `BitXor` and `BitXorAssign`: toggle
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//! - `Sub` and `SubAssign`: set difference
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//! - `Not`: set complement
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//!
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//! # Methods
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//!
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//! The following methods are defined for the generated `struct`:
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//!
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//! - `empty`: an empty set of flags
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//! - `all`: the set of all flags
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//! - `bits`: the raw value of the flags currently stored
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//! - `from_bits`: convert from underlying bit representation, unless that
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//! representation contains bits that do not correspond to a flag
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//! - `from_bits_truncate`: convert from underlying bit representation, dropping
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//! any bits that do not correspond to flags
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//! - `is_empty`: `true` if no flags are currently stored
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//! - `is_all`: `true` if all flags are currently set
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//! - `intersects`: `true` if there are flags common to both `self` and `other`
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//! - `contains`: `true` all of the flags in `other` are contained within `self`
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//! - `insert`: inserts the specified flags in-place
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//! - `remove`: removes the specified flags in-place
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//! - `toggle`: the specified flags will be inserted if not present, and removed
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//! if they are.
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//! - `set`: inserts or removes the specified flags depending on the passed value
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//!
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//! ## Default
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//!
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//! The `Default` trait is not automatically implemented for the generated struct.
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//!
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//! If your default value is equal to `0` (which is the same value as calling `empty()`
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//! on the generated struct), you can simply derive `Default`:
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//!
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//! ```
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//! #[macro_use]
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//! extern crate bitflags;
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//!
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//! bitflags! {
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//! // Results in default value with bits: 0
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//! #[derive(Default)]
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//! struct Flags: u32 {
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//! const A = 0b00000001;
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//! const B = 0b00000010;
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//! const C = 0b00000100;
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//! }
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//! }
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//!
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//! fn main() {
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//! let derived_default: Flags = Default::default();
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//! assert_eq!(derived_default.bits(), 0);
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//! }
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//! ```
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//!
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//! If your default value is not equal to `0` you need to implement `Default` yourself:
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//!
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//! ```
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//! #[macro_use]
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//! extern crate bitflags;
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//!
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//! bitflags! {
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//! struct Flags: u32 {
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//! const A = 0b00000001;
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//! const B = 0b00000010;
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//! const C = 0b00000100;
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//! }
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//! }
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//!
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//! // explicit `Default` implementation
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//! impl Default for Flags {
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//! fn default() -> Flags {
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//! Flags::A | Flags::C
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//! }
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//! }
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//!
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//! fn main() {
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//! let implemented_default: Flags = Default::default();
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//! assert_eq!(implemented_default, (Flags::A | Flags::C));
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//! }
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//! ```
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//!
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//! # Zero Flags
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//!
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//! Flags with a value equal to zero will have some strange behavior that one should be aware of.
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//!
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//! ```
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//! #[macro_use]
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//! extern crate bitflags;
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//!
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//! bitflags! {
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//! struct Flags: u32 {
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//! const NONE = 0b00000000;
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//! const SOME = 0b00000001;
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//! }
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//! }
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//!
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//! fn main() {
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//! let empty = Flags::empty();
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//! let none = Flags::NONE;
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//! let some = Flags::SOME;
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//!
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//! // Zero flags are treated as always present
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//! assert!(empty.contains(Flags::NONE));
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//! assert!(none.contains(Flags::NONE));
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//! assert!(some.contains(Flags::NONE));
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//!
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//! // Zero flags will be ignored when testing for emptiness
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//! assert!(none.is_empty());
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//! }
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//! ```
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#![doc(html_root_url = "https://docs.rs/bitflags/1.1.0")]
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// Re-export libcore using an alias so that the macros can work without
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// requiring `extern crate core` downstream.
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#[doc(hidden)]
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pub extern crate core as _core;
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/// The macro used to generate the flag structure.
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///
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/// See the [crate level docs](../bitflags/index.html) for complete documentation.
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///
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/// # Example
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///
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/// ```
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/// #[macro_use]
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/// extern crate bitflags;
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///
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/// bitflags! {
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/// struct Flags: u32 {
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/// const A = 0b00000001;
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/// const B = 0b00000010;
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/// const C = 0b00000100;
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/// const ABC = Self::A.bits | Self::B.bits | Self::C.bits;
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/// }
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/// }
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///
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/// fn main() {
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/// let e1 = Flags::A | Flags::C;
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/// let e2 = Flags::B | Flags::C;
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/// assert_eq!((e1 | e2), Flags::ABC); // union
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/// assert_eq!((e1 & e2), Flags::C); // intersection
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/// assert_eq!((e1 - e2), Flags::A); // set difference
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/// assert_eq!(!e2, Flags::A); // set complement
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/// }
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/// ```
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///
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/// The generated `struct`s can also be extended with type and trait
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/// implementations:
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///
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/// ```
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/// #[macro_use]
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/// extern crate bitflags;
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///
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/// use std::fmt;
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///
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/// bitflags! {
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/// struct Flags: u32 {
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/// const A = 0b00000001;
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/// const B = 0b00000010;
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/// }
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/// }
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///
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/// impl Flags {
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/// pub fn clear(&mut self) {
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/// self.bits = 0; // The `bits` field can be accessed from within the
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/// // same module where the `bitflags!` macro was invoked.
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/// }
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/// }
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///
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/// impl fmt::Display for Flags {
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/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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/// write!(f, "hi!")
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/// }
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/// }
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///
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/// fn main() {
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/// let mut flags = Flags::A | Flags::B;
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/// flags.clear();
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/// assert!(flags.is_empty());
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/// assert_eq!(format!("{}", flags), "hi!");
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/// assert_eq!(format!("{:?}", Flags::A | Flags::B), "A | B");
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/// assert_eq!(format!("{:?}", Flags::B), "B");
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/// }
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/// ```
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#[macro_export(local_inner_macros)]
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macro_rules! bitflags {
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(
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$(#[$outer:meta])*
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pub struct $BitFlags:ident: $T:ty {
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$(
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$(#[$inner:ident $($args:tt)*])*
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const $Flag:ident = $value:expr;
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)+
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}
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) => {
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__bitflags! {
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$(#[$outer])*
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(pub) $BitFlags: $T {
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$(
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$(#[$inner $($args)*])*
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$Flag = $value;
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)+
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}
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}
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};
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(
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$(#[$outer:meta])*
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struct $BitFlags:ident: $T:ty {
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$(
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$(#[$inner:ident $($args:tt)*])*
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const $Flag:ident = $value:expr;
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)+
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}
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) => {
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__bitflags! {
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$(#[$outer])*
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() $BitFlags: $T {
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$(
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$(#[$inner $($args)*])*
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$Flag = $value;
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)+
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}
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}
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};
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(
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$(#[$outer:meta])*
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pub ($($vis:tt)+) struct $BitFlags:ident: $T:ty {
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$(
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$(#[$inner:ident $($args:tt)*])*
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const $Flag:ident = $value:expr;
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)+
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}
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) => {
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__bitflags! {
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$(#[$outer])*
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(pub ($($vis)+)) $BitFlags: $T {
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$(
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$(#[$inner $($args)*])*
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$Flag = $value;
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)+
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}
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}
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};
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}
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#[macro_export(local_inner_macros)]
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#[doc(hidden)]
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macro_rules! __bitflags {
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(
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$(#[$outer:meta])*
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($($vis:tt)*) $BitFlags:ident: $T:ty {
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$(
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$(#[$inner:ident $($args:tt)*])*
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$Flag:ident = $value:expr;
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)+
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}
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) => {
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$(#[$outer])*
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#[derive(Copy, PartialEq, Eq, Clone, PartialOrd, Ord, Hash)]
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$($vis)* struct $BitFlags {
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bits: $T,
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}
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__impl_bitflags! {
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$BitFlags: $T {
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$(
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$(#[$inner $($args)*])*
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$Flag = $value;
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)+
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}
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}
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};
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}
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#[macro_export(local_inner_macros)]
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#[doc(hidden)]
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#[cfg(bitflags_const_fn)]
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macro_rules! __fn_bitflags {
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(
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$(# $attr_args:tt)*
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const fn $($item:tt)*
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) => {
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$(# $attr_args)*
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const fn $($item)*
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};
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(
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$(# $attr_args:tt)*
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pub const fn $($item:tt)*
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) => {
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$(# $attr_args)*
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pub const fn $($item)*
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};
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}
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#[macro_export(local_inner_macros)]
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#[doc(hidden)]
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#[cfg(not(bitflags_const_fn))]
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macro_rules! __fn_bitflags {
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|
(
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$(# $attr_args:tt)*
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const fn $($item:tt)*
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) => {
|
|
$(# $attr_args)*
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|
fn $($item)*
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|
};
|
|
(
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|
$(# $attr_args:tt)*
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|
pub const fn $($item:tt)*
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|
) => {
|
|
$(# $attr_args)*
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pub fn $($item)*
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};
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}
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|
|
|
#[macro_export(local_inner_macros)]
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#[doc(hidden)]
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macro_rules! __impl_bitflags {
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(
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$BitFlags:ident: $T:ty {
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$(
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$(#[$attr:ident $($args:tt)*])*
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$Flag:ident = $value:expr;
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)+
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}
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) => {
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impl crate::bitflags::_core::fmt::Debug for $BitFlags {
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fn fmt(&self, f: &mut crate::bitflags::_core::fmt::Formatter) -> crate::bitflags::_core::fmt::Result {
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|
// This convoluted approach is to handle #[cfg]-based flag
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|
// omission correctly. For example it needs to support:
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//
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// #[cfg(unix)] const A: Flag = /* ... */;
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// #[cfg(windows)] const B: Flag = /* ... */;
|
|
|
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// Unconditionally define a check for every flag, even disabled
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// ones.
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#[allow(non_snake_case)]
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trait __BitFlags {
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|
$(
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#[inline]
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fn $Flag(&self) -> bool { false }
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)+
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}
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|
|
|
// Conditionally override the check for just those flags that
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// are not #[cfg]ed away.
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impl __BitFlags for $BitFlags {
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|
$(
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__impl_bitflags! {
|
|
#[allow(deprecated)]
|
|
#[inline]
|
|
$(? #[$attr $($args)*])*
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|
fn $Flag(&self) -> bool {
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|
if Self::$Flag.bits == 0 && self.bits != 0 {
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false
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} else {
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self.bits & Self::$Flag.bits == Self::$Flag.bits
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}
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}
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}
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)+
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}
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|
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let mut first = true;
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$(
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if <$BitFlags as __BitFlags>::$Flag(self) {
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if !first {
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f.write_str(" | ")?;
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}
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first = false;
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f.write_str(__bitflags_stringify!($Flag))?;
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}
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)+
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if first {
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f.write_str("(empty)")?;
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}
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Ok(())
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}
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}
|
|
impl crate::bitflags::_core::fmt::Binary for $BitFlags {
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fn fmt(&self, f: &mut crate::bitflags::_core::fmt::Formatter) -> crate::bitflags::_core::fmt::Result {
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crate::bitflags::_core::fmt::Binary::fmt(&self.bits, f)
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}
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}
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impl crate::bitflags::_core::fmt::Octal for $BitFlags {
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fn fmt(&self, f: &mut crate::bitflags::_core::fmt::Formatter) -> crate::bitflags::_core::fmt::Result {
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crate::bitflags::_core::fmt::Octal::fmt(&self.bits, f)
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}
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}
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impl crate::bitflags::_core::fmt::LowerHex for $BitFlags {
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fn fmt(&self, f: &mut crate::bitflags::_core::fmt::Formatter) -> crate::bitflags::_core::fmt::Result {
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crate::bitflags::_core::fmt::LowerHex::fmt(&self.bits, f)
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}
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}
|
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impl crate::bitflags::_core::fmt::UpperHex for $BitFlags {
|
|
fn fmt(&self, f: &mut crate::bitflags::_core::fmt::Formatter) -> crate::bitflags::_core::fmt::Result {
|
|
crate::bitflags::_core::fmt::UpperHex::fmt(&self.bits, f)
|
|
}
|
|
}
|
|
|
|
#[allow(dead_code)]
|
|
impl $BitFlags {
|
|
$(
|
|
$(#[$attr $($args)*])*
|
|
pub const $Flag: $BitFlags = $BitFlags { bits: $value };
|
|
)+
|
|
|
|
__fn_bitflags! {
|
|
/// Returns an empty set of flags
|
|
#[inline]
|
|
pub const fn empty() -> $BitFlags {
|
|
$BitFlags { bits: 0 }
|
|
}
|
|
}
|
|
|
|
__fn_bitflags! {
|
|
/// Returns the set containing all flags.
|
|
#[inline]
|
|
pub const fn all() -> $BitFlags {
|
|
// See `Debug::fmt` for why this approach is taken.
|
|
#[allow(non_snake_case)]
|
|
trait __BitFlags {
|
|
$(
|
|
#[inline]
|
|
const $Flag: $T = 0;
|
|
)+
|
|
}
|
|
impl __BitFlags for $BitFlags {
|
|
$(
|
|
__impl_bitflags! {
|
|
#[allow(deprecated)]
|
|
#[inline]
|
|
$(? #[$attr $($args)*])*
|
|
const $Flag: $T = Self::$Flag.bits;
|
|
}
|
|
)+
|
|
}
|
|
$BitFlags { bits: $(<$BitFlags as __BitFlags>::$Flag)|+ }
|
|
}
|
|
}
|
|
|
|
__fn_bitflags! {
|
|
/// Returns the raw value of the flags currently stored.
|
|
#[inline]
|
|
pub const fn bits(&self) -> $T {
|
|
self.bits
|
|
}
|
|
}
|
|
|
|
/// Convert from underlying bit representation, unless that
|
|
/// representation contains bits that do not correspond to a flag.
|
|
#[inline]
|
|
pub fn from_bits(bits: $T) -> crate::bitflags::_core::option::Option<$BitFlags> {
|
|
if (bits & !$BitFlags::all().bits()) == 0 {
|
|
crate::bitflags::_core::option::Option::Some($BitFlags { bits })
|
|
} else {
|
|
crate::bitflags::_core::option::Option::None
|
|
}
|
|
}
|
|
|
|
__fn_bitflags! {
|
|
/// Convert from underlying bit representation, dropping any bits
|
|
/// that do not correspond to flags.
|
|
#[inline]
|
|
pub const fn from_bits_truncate(bits: $T) -> $BitFlags {
|
|
$BitFlags { bits: bits & $BitFlags::all().bits }
|
|
}
|
|
}
|
|
|
|
__fn_bitflags! {
|
|
/// Returns `true` if no flags are currently stored.
|
|
#[inline]
|
|
pub const fn is_empty(&self) -> bool {
|
|
self.bits() == $BitFlags::empty().bits()
|
|
}
|
|
}
|
|
|
|
__fn_bitflags! {
|
|
/// Returns `true` if all flags are currently set.
|
|
#[inline]
|
|
pub const fn is_all(&self) -> bool {
|
|
self.bits == $BitFlags::all().bits
|
|
}
|
|
}
|
|
|
|
__fn_bitflags! {
|
|
/// Returns `true` if there are flags common to both `self` and `other`.
|
|
#[inline]
|
|
pub const fn intersects(&self, other: $BitFlags) -> bool {
|
|
!$BitFlags{ bits: self.bits & other.bits}.is_empty()
|
|
}
|
|
}
|
|
|
|
__fn_bitflags! {
|
|
/// Returns `true` all of the flags in `other` are contained within `self`.
|
|
#[inline]
|
|
pub const fn contains(&self, other: $BitFlags) -> bool {
|
|
(self.bits & other.bits) == other.bits
|
|
}
|
|
}
|
|
|
|
/// Inserts the specified flags in-place.
|
|
#[inline]
|
|
pub fn insert(&mut self, other: $BitFlags) {
|
|
self.bits |= other.bits;
|
|
}
|
|
|
|
/// Removes the specified flags in-place.
|
|
#[inline]
|
|
pub fn remove(&mut self, other: $BitFlags) {
|
|
self.bits &= !other.bits;
|
|
}
|
|
|
|
/// Toggles the specified flags in-place.
|
|
#[inline]
|
|
pub fn toggle(&mut self, other: $BitFlags) {
|
|
self.bits ^= other.bits;
|
|
}
|
|
|
|
/// Inserts or removes the specified flags depending on the passed value.
|
|
#[inline]
|
|
pub fn set(&mut self, other: $BitFlags, value: bool) {
|
|
if value {
|
|
self.insert(other);
|
|
} else {
|
|
self.remove(other);
|
|
}
|
|
}
|
|
}
|
|
|
|
impl crate::bitflags::_core::ops::BitOr for $BitFlags {
|
|
type Output = $BitFlags;
|
|
|
|
/// Returns the union of the two sets of flags.
|
|
#[inline]
|
|
fn bitor(self, other: $BitFlags) -> $BitFlags {
|
|
$BitFlags { bits: self.bits | other.bits }
|
|
}
|
|
}
|
|
|
|
impl crate::bitflags::_core::ops::BitOrAssign for $BitFlags {
|
|
|
|
/// Adds the set of flags.
|
|
#[inline]
|
|
fn bitor_assign(&mut self, other: $BitFlags) {
|
|
self.bits |= other.bits;
|
|
}
|
|
}
|
|
|
|
impl crate::bitflags::_core::ops::BitXor for $BitFlags {
|
|
type Output = $BitFlags;
|
|
|
|
/// Returns the left flags, but with all the right flags toggled.
|
|
#[inline]
|
|
fn bitxor(self, other: $BitFlags) -> $BitFlags {
|
|
$BitFlags { bits: self.bits ^ other.bits }
|
|
}
|
|
}
|
|
|
|
impl crate::bitflags::_core::ops::BitXorAssign for $BitFlags {
|
|
|
|
/// Toggles the set of flags.
|
|
#[inline]
|
|
fn bitxor_assign(&mut self, other: $BitFlags) {
|
|
self.bits ^= other.bits;
|
|
}
|
|
}
|
|
|
|
impl crate::bitflags::_core::ops::BitAnd for $BitFlags {
|
|
type Output = $BitFlags;
|
|
|
|
/// Returns the intersection between the two sets of flags.
|
|
#[inline]
|
|
fn bitand(self, other: $BitFlags) -> $BitFlags {
|
|
$BitFlags { bits: self.bits & other.bits }
|
|
}
|
|
}
|
|
|
|
impl crate::bitflags::_core::ops::BitAndAssign for $BitFlags {
|
|
|
|
/// Disables all flags disabled in the set.
|
|
#[inline]
|
|
fn bitand_assign(&mut self, other: $BitFlags) {
|
|
self.bits &= other.bits;
|
|
}
|
|
}
|
|
|
|
impl crate::bitflags::_core::ops::Sub for $BitFlags {
|
|
type Output = $BitFlags;
|
|
|
|
/// Returns the set difference of the two sets of flags.
|
|
#[inline]
|
|
fn sub(self, other: $BitFlags) -> $BitFlags {
|
|
$BitFlags { bits: self.bits & !other.bits }
|
|
}
|
|
}
|
|
|
|
impl crate::bitflags::_core::ops::SubAssign for $BitFlags {
|
|
|
|
/// Disables all flags enabled in the set.
|
|
#[inline]
|
|
fn sub_assign(&mut self, other: $BitFlags) {
|
|
self.bits &= !other.bits;
|
|
}
|
|
}
|
|
|
|
impl crate::bitflags::_core::ops::Not for $BitFlags {
|
|
type Output = $BitFlags;
|
|
|
|
/// Returns the complement of this set of flags.
|
|
#[inline]
|
|
fn not(self) -> $BitFlags {
|
|
$BitFlags { bits: !self.bits } & $BitFlags::all()
|
|
}
|
|
}
|
|
|
|
impl crate::bitflags::_core::iter::Extend<$BitFlags> for $BitFlags {
|
|
fn extend<T: crate::bitflags::_core::iter::IntoIterator<Item=$BitFlags>>(&mut self, iterator: T) {
|
|
for item in iterator {
|
|
self.insert(item)
|
|
}
|
|
}
|
|
}
|
|
|
|
impl crate::bitflags::_core::iter::FromIterator<$BitFlags> for $BitFlags {
|
|
fn from_iter<T: crate::bitflags::_core::iter::IntoIterator<Item=$BitFlags>>(iterator: T) -> $BitFlags {
|
|
let mut result = Self::empty();
|
|
result.extend(iterator);
|
|
result
|
|
}
|
|
}
|
|
};
|
|
|
|
// Every attribute that the user writes on a const is applied to the
|
|
// corresponding const that we generate, but within the implementation of
|
|
// Debug and all() we want to ignore everything but #[cfg] attributes. In
|
|
// particular, including a #[deprecated] attribute on those items would fail
|
|
// to compile.
|
|
// https://github.com/bitflags/bitflags/issues/109
|
|
//
|
|
// Input:
|
|
//
|
|
// ? #[cfg(feature = "advanced")]
|
|
// ? #[deprecated(note = "Use somthing else.")]
|
|
// ? #[doc = r"High quality documentation."]
|
|
// fn f() -> i32 { /* ... */ }
|
|
//
|
|
// Output:
|
|
//
|
|
// #[cfg(feature = "advanced")]
|
|
// fn f() -> i32 { /* ... */ }
|
|
(
|
|
$(#[$filtered:meta])*
|
|
? #[cfg $($cfgargs:tt)*]
|
|
$(? #[$rest:ident $($restargs:tt)*])*
|
|
fn $($item:tt)*
|
|
) => {
|
|
__impl_bitflags! {
|
|
$(#[$filtered])*
|
|
#[cfg $($cfgargs)*]
|
|
$(? #[$rest $($restargs)*])*
|
|
fn $($item)*
|
|
}
|
|
};
|
|
(
|
|
$(#[$filtered:meta])*
|
|
// $next != `cfg`
|
|
? #[$next:ident $($nextargs:tt)*]
|
|
$(? #[$rest:ident $($restargs:tt)*])*
|
|
fn $($item:tt)*
|
|
) => {
|
|
__impl_bitflags! {
|
|
$(#[$filtered])*
|
|
// $next filtered out
|
|
$(? #[$rest $($restargs)*])*
|
|
fn $($item)*
|
|
}
|
|
};
|
|
(
|
|
$(#[$filtered:meta])*
|
|
fn $($item:tt)*
|
|
) => {
|
|
$(#[$filtered])*
|
|
fn $($item)*
|
|
};
|
|
|
|
// Every attribute that the user writes on a const is applied to the
|
|
// corresponding const that we generate, but within the implementation of
|
|
// Debug and all() we want to ignore everything but #[cfg] attributes. In
|
|
// particular, including a #[deprecated] attribute on those items would fail
|
|
// to compile.
|
|
// https://github.com/bitflags/bitflags/issues/109
|
|
//
|
|
// const version
|
|
//
|
|
// Input:
|
|
//
|
|
// ? #[cfg(feature = "advanced")]
|
|
// ? #[deprecated(note = "Use somthing else.")]
|
|
// ? #[doc = r"High quality documentation."]
|
|
// const f: i32 { /* ... */ }
|
|
//
|
|
// Output:
|
|
//
|
|
// #[cfg(feature = "advanced")]
|
|
// const f: i32 { /* ... */ }
|
|
(
|
|
$(#[$filtered:meta])*
|
|
? #[cfg $($cfgargs:tt)*]
|
|
$(? #[$rest:ident $($restargs:tt)*])*
|
|
const $($item:tt)*
|
|
) => {
|
|
__impl_bitflags! {
|
|
$(#[$filtered])*
|
|
#[cfg $($cfgargs)*]
|
|
$(? #[$rest $($restargs)*])*
|
|
const $($item)*
|
|
}
|
|
};
|
|
(
|
|
$(#[$filtered:meta])*
|
|
// $next != `cfg`
|
|
? #[$next:ident $($nextargs:tt)*]
|
|
$(? #[$rest:ident $($restargs:tt)*])*
|
|
const $($item:tt)*
|
|
) => {
|
|
__impl_bitflags! {
|
|
$(#[$filtered])*
|
|
// $next filtered out
|
|
$(? #[$rest $($restargs)*])*
|
|
const $($item)*
|
|
}
|
|
};
|
|
(
|
|
$(#[$filtered:meta])*
|
|
const $($item:tt)*
|
|
) => {
|
|
$(#[$filtered])*
|
|
const $($item)*
|
|
};
|
|
}
|
|
|
|
// Same as std::stringify but callable from __impl_bitflags, which needs to use
|
|
// local_inner_macros so can only directly call macros from this crate.
|
|
#[macro_export]
|
|
#[doc(hidden)]
|
|
macro_rules! __bitflags_stringify {
|
|
($s:ident) => {
|
|
stringify!($s)
|
|
};
|
|
}
|
|
|
|
#[cfg(feature = "example_generated")]
|
|
pub mod example_generated;
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use std::collections::hash_map::DefaultHasher;
|
|
use std::hash::{Hash, Hasher};
|
|
|
|
bitflags! {
|
|
#[doc = "> The first principle is that you must not fool yourself — and"]
|
|
#[doc = "> you are the easiest person to fool."]
|
|
#[doc = "> "]
|
|
#[doc = "> - Richard Feynman"]
|
|
struct Flags: u32 {
|
|
const A = 0b00000001;
|
|
#[doc = "<pcwalton> macros are way better at generating code than trans is"]
|
|
const B = 0b00000010;
|
|
const C = 0b00000100;
|
|
#[doc = "* cmr bed"]
|
|
#[doc = "* strcat table"]
|
|
#[doc = "<strcat> wait what?"]
|
|
const ABC = Self::A.bits | Self::B.bits | Self::C.bits;
|
|
}
|
|
}
|
|
|
|
bitflags! {
|
|
struct _CfgFlags: u32 {
|
|
#[cfg(unix)]
|
|
const _CFG_A = 0b01;
|
|
#[cfg(windows)]
|
|
const _CFG_B = 0b01;
|
|
#[cfg(unix)]
|
|
const _CFG_C = Self::_CFG_A.bits | 0b10;
|
|
}
|
|
}
|
|
|
|
bitflags! {
|
|
struct AnotherSetOfFlags: i8 {
|
|
const ANOTHER_FLAG = -1_i8;
|
|
}
|
|
}
|
|
|
|
bitflags! {
|
|
struct LongFlags: u32 {
|
|
const LONG_A = 0b1111111111111111;
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_bits() {
|
|
assert_eq!(Flags::empty().bits(), 0b00000000);
|
|
assert_eq!(Flags::A.bits(), 0b00000001);
|
|
assert_eq!(Flags::ABC.bits(), 0b00000111);
|
|
|
|
assert_eq!(AnotherSetOfFlags::empty().bits(), 0b00);
|
|
assert_eq!(AnotherSetOfFlags::ANOTHER_FLAG.bits(), !0_i8);
|
|
}
|
|
|
|
#[test]
|
|
fn test_from_bits() {
|
|
assert_eq!(Flags::from_bits(0), Some(Flags::empty()));
|
|
assert_eq!(Flags::from_bits(0b1), Some(Flags::A));
|
|
assert_eq!(Flags::from_bits(0b10), Some(Flags::B));
|
|
assert_eq!(Flags::from_bits(0b11), Some(Flags::A | Flags::B));
|
|
assert_eq!(Flags::from_bits(0b1000), None);
|
|
|
|
assert_eq!(
|
|
AnotherSetOfFlags::from_bits(!0_i8),
|
|
Some(AnotherSetOfFlags::ANOTHER_FLAG)
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_from_bits_truncate() {
|
|
assert_eq!(Flags::from_bits_truncate(0), Flags::empty());
|
|
assert_eq!(Flags::from_bits_truncate(0b1), Flags::A);
|
|
assert_eq!(Flags::from_bits_truncate(0b10), Flags::B);
|
|
assert_eq!(Flags::from_bits_truncate(0b11), (Flags::A | Flags::B));
|
|
assert_eq!(Flags::from_bits_truncate(0b1000), Flags::empty());
|
|
assert_eq!(Flags::from_bits_truncate(0b1001), Flags::A);
|
|
|
|
assert_eq!(
|
|
AnotherSetOfFlags::from_bits_truncate(0_i8),
|
|
AnotherSetOfFlags::empty()
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_is_empty() {
|
|
assert!(Flags::empty().is_empty());
|
|
assert!(!Flags::A.is_empty());
|
|
assert!(!Flags::ABC.is_empty());
|
|
|
|
assert!(!AnotherSetOfFlags::ANOTHER_FLAG.is_empty());
|
|
}
|
|
|
|
#[test]
|
|
fn test_is_all() {
|
|
assert!(Flags::all().is_all());
|
|
assert!(!Flags::A.is_all());
|
|
assert!(Flags::ABC.is_all());
|
|
|
|
assert!(AnotherSetOfFlags::ANOTHER_FLAG.is_all());
|
|
}
|
|
|
|
#[test]
|
|
fn test_two_empties_do_not_intersect() {
|
|
let e1 = Flags::empty();
|
|
let e2 = Flags::empty();
|
|
assert!(!e1.intersects(e2));
|
|
|
|
assert!(AnotherSetOfFlags::ANOTHER_FLAG.intersects(AnotherSetOfFlags::ANOTHER_FLAG));
|
|
}
|
|
|
|
#[test]
|
|
fn test_empty_does_not_intersect_with_full() {
|
|
let e1 = Flags::empty();
|
|
let e2 = Flags::ABC;
|
|
assert!(!e1.intersects(e2));
|
|
}
|
|
|
|
#[test]
|
|
fn test_disjoint_intersects() {
|
|
let e1 = Flags::A;
|
|
let e2 = Flags::B;
|
|
assert!(!e1.intersects(e2));
|
|
}
|
|
|
|
#[test]
|
|
fn test_overlapping_intersects() {
|
|
let e1 = Flags::A;
|
|
let e2 = Flags::A | Flags::B;
|
|
assert!(e1.intersects(e2));
|
|
}
|
|
|
|
#[test]
|
|
fn test_contains() {
|
|
let e1 = Flags::A;
|
|
let e2 = Flags::A | Flags::B;
|
|
assert!(!e1.contains(e2));
|
|
assert!(e2.contains(e1));
|
|
assert!(Flags::ABC.contains(e2));
|
|
|
|
assert!(AnotherSetOfFlags::ANOTHER_FLAG.contains(AnotherSetOfFlags::ANOTHER_FLAG));
|
|
}
|
|
|
|
#[test]
|
|
fn test_insert() {
|
|
let mut e1 = Flags::A;
|
|
let e2 = Flags::A | Flags::B;
|
|
e1.insert(e2);
|
|
assert_eq!(e1, e2);
|
|
|
|
let mut e3 = AnotherSetOfFlags::empty();
|
|
e3.insert(AnotherSetOfFlags::ANOTHER_FLAG);
|
|
assert_eq!(e3, AnotherSetOfFlags::ANOTHER_FLAG);
|
|
}
|
|
|
|
#[test]
|
|
fn test_remove() {
|
|
let mut e1 = Flags::A | Flags::B;
|
|
let e2 = Flags::A | Flags::C;
|
|
e1.remove(e2);
|
|
assert_eq!(e1, Flags::B);
|
|
|
|
let mut e3 = AnotherSetOfFlags::ANOTHER_FLAG;
|
|
e3.remove(AnotherSetOfFlags::ANOTHER_FLAG);
|
|
assert_eq!(e3, AnotherSetOfFlags::empty());
|
|
}
|
|
|
|
#[test]
|
|
fn test_operators() {
|
|
let e1 = Flags::A | Flags::C;
|
|
let e2 = Flags::B | Flags::C;
|
|
assert_eq!((e1 | e2), Flags::ABC); // union
|
|
assert_eq!((e1 & e2), Flags::C); // intersection
|
|
assert_eq!((e1 - e2), Flags::A); // set difference
|
|
assert_eq!(!e2, Flags::A); // set complement
|
|
assert_eq!(e1 ^ e2, Flags::A | Flags::B); // toggle
|
|
let mut e3 = e1;
|
|
e3.toggle(e2);
|
|
assert_eq!(e3, Flags::A | Flags::B);
|
|
|
|
let mut m4 = AnotherSetOfFlags::empty();
|
|
m4.toggle(AnotherSetOfFlags::empty());
|
|
assert_eq!(m4, AnotherSetOfFlags::empty());
|
|
}
|
|
|
|
#[test]
|
|
fn test_set() {
|
|
let mut e1 = Flags::A | Flags::C;
|
|
e1.set(Flags::B, true);
|
|
e1.set(Flags::C, false);
|
|
|
|
assert_eq!(e1, Flags::A | Flags::B);
|
|
}
|
|
|
|
#[test]
|
|
fn test_assignment_operators() {
|
|
let mut m1 = Flags::empty();
|
|
let e1 = Flags::A | Flags::C;
|
|
// union
|
|
m1 |= Flags::A;
|
|
assert_eq!(m1, Flags::A);
|
|
// intersection
|
|
m1 &= e1;
|
|
assert_eq!(m1, Flags::A);
|
|
// set difference
|
|
m1 -= m1;
|
|
assert_eq!(m1, Flags::empty());
|
|
// toggle
|
|
m1 ^= e1;
|
|
assert_eq!(m1, e1);
|
|
}
|
|
|
|
|
|
#[cfg(bitflags_const_fn)]
|
|
#[test]
|
|
fn test_const_fn() {
|
|
const _M1: Flags = Flags::empty();
|
|
|
|
const M2: Flags = Flags::A;
|
|
assert_eq!(M2, Flags::A);
|
|
|
|
const M3: Flags = Flags::C;
|
|
assert_eq!(M3, Flags::C);
|
|
}
|
|
|
|
#[test]
|
|
fn test_extend() {
|
|
let mut flags;
|
|
|
|
flags = Flags::empty();
|
|
flags.extend([].iter().cloned());
|
|
assert_eq!(flags, Flags::empty());
|
|
|
|
flags = Flags::empty();
|
|
flags.extend([Flags::A, Flags::B].iter().cloned());
|
|
assert_eq!(flags, Flags::A | Flags::B);
|
|
|
|
flags = Flags::A;
|
|
flags.extend([Flags::A, Flags::B].iter().cloned());
|
|
assert_eq!(flags, Flags::A | Flags::B);
|
|
|
|
flags = Flags::B;
|
|
flags.extend([Flags::A, Flags::ABC].iter().cloned());
|
|
assert_eq!(flags, Flags::ABC);
|
|
}
|
|
|
|
#[test]
|
|
fn test_from_iterator() {
|
|
assert_eq!([].iter().cloned().collect::<Flags>(), Flags::empty());
|
|
assert_eq!(
|
|
[Flags::A, Flags::B].iter().cloned().collect::<Flags>(),
|
|
Flags::A | Flags::B
|
|
);
|
|
assert_eq!(
|
|
[Flags::A, Flags::ABC].iter().cloned().collect::<Flags>(),
|
|
Flags::ABC
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_lt() {
|
|
let mut a = Flags::empty();
|
|
let mut b = Flags::empty();
|
|
|
|
assert!(!(a < b) && !(b < a));
|
|
b = Flags::B;
|
|
assert!(a < b);
|
|
a = Flags::C;
|
|
assert!(!(a < b) && b < a);
|
|
b = Flags::C | Flags::B;
|
|
assert!(a < b);
|
|
}
|
|
|
|
#[test]
|
|
fn test_ord() {
|
|
let mut a = Flags::empty();
|
|
let mut b = Flags::empty();
|
|
|
|
assert!(a <= b && a >= b);
|
|
a = Flags::A;
|
|
assert!(a > b && a >= b);
|
|
assert!(b < a && b <= a);
|
|
b = Flags::B;
|
|
assert!(b > a && b >= a);
|
|
assert!(a < b && a <= b);
|
|
}
|
|
|
|
fn hash<T: Hash>(t: &T) -> u64 {
|
|
let mut s = DefaultHasher::new();
|
|
t.hash(&mut s);
|
|
s.finish()
|
|
}
|
|
|
|
#[test]
|
|
fn test_hash() {
|
|
let mut x = Flags::empty();
|
|
let mut y = Flags::empty();
|
|
assert_eq!(hash(&x), hash(&y));
|
|
x = Flags::all();
|
|
y = Flags::ABC;
|
|
assert_eq!(hash(&x), hash(&y));
|
|
}
|
|
|
|
#[test]
|
|
fn test_debug() {
|
|
assert_eq!(format!("{:?}", Flags::A | Flags::B), "A | B");
|
|
assert_eq!(format!("{:?}", Flags::empty()), "(empty)");
|
|
assert_eq!(format!("{:?}", Flags::ABC), "A | B | C | ABC");
|
|
}
|
|
|
|
#[test]
|
|
fn test_binary() {
|
|
assert_eq!(format!("{:b}", Flags::ABC), "111");
|
|
assert_eq!(format!("{:#b}", Flags::ABC), "0b111");
|
|
}
|
|
|
|
#[test]
|
|
fn test_octal() {
|
|
assert_eq!(format!("{:o}", LongFlags::LONG_A), "177777");
|
|
assert_eq!(format!("{:#o}", LongFlags::LONG_A), "0o177777");
|
|
}
|
|
|
|
#[test]
|
|
fn test_lowerhex() {
|
|
assert_eq!(format!("{:x}", LongFlags::LONG_A), "ffff");
|
|
assert_eq!(format!("{:#x}", LongFlags::LONG_A), "0xffff");
|
|
}
|
|
|
|
#[test]
|
|
fn test_upperhex() {
|
|
assert_eq!(format!("{:X}", LongFlags::LONG_A), "FFFF");
|
|
assert_eq!(format!("{:#X}", LongFlags::LONG_A), "0xFFFF");
|
|
}
|
|
|
|
mod submodule {
|
|
bitflags! {
|
|
pub struct PublicFlags: i8 {
|
|
const X = 0;
|
|
}
|
|
}
|
|
bitflags! {
|
|
struct PrivateFlags: i8 {
|
|
const Y = 0;
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_private() {
|
|
let _ = PrivateFlags::Y;
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_public() {
|
|
let _ = submodule::PublicFlags::X;
|
|
}
|
|
|
|
mod t1 {
|
|
mod foo {
|
|
pub type Bar = i32;
|
|
}
|
|
|
|
bitflags! {
|
|
/// baz
|
|
struct Flags: foo::Bar {
|
|
const A = 0b00000001;
|
|
#[cfg(foo)]
|
|
const B = 0b00000010;
|
|
#[cfg(foo)]
|
|
const C = 0b00000010;
|
|
}
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_in_function() {
|
|
bitflags! {
|
|
struct Flags: u8 {
|
|
const A = 1;
|
|
#[cfg(any())] // false
|
|
const B = 2;
|
|
}
|
|
}
|
|
assert_eq!(Flags::all(), Flags::A);
|
|
assert_eq!(format!("{:?}", Flags::A), "A");
|
|
}
|
|
|
|
#[test]
|
|
fn test_deprecated() {
|
|
bitflags! {
|
|
pub struct TestFlags: u32 {
|
|
#[deprecated(note = "Use something else.")]
|
|
const ONE = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_pub_crate() {
|
|
mod module {
|
|
bitflags! {
|
|
pub (crate) struct Test: u8 {
|
|
const FOO = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
assert_eq!(module::Test::FOO.bits(), 1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_pub_in_module() {
|
|
mod module {
|
|
mod submodule {
|
|
bitflags! {
|
|
// `pub (in super)` means only the module `module` will
|
|
// be able to access this.
|
|
pub (in super) struct Test: u8 {
|
|
const FOO = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
mod test {
|
|
// Note: due to `pub (in super)`,
|
|
// this cannot be accessed directly by the testing code.
|
|
pub(super) fn value() -> u8 {
|
|
super::submodule::Test::FOO.bits()
|
|
}
|
|
}
|
|
|
|
pub fn value() -> u8 {
|
|
test::value()
|
|
}
|
|
}
|
|
|
|
assert_eq!(module::value(), 1)
|
|
}
|
|
|
|
#[test]
|
|
fn test_zero_value_flags() {
|
|
bitflags! {
|
|
struct Flags: u32 {
|
|
const NONE = 0b0;
|
|
const SOME = 0b1;
|
|
}
|
|
}
|
|
|
|
assert!(Flags::empty().contains(Flags::NONE));
|
|
assert!(Flags::SOME.contains(Flags::NONE));
|
|
assert!(Flags::NONE.is_empty());
|
|
|
|
assert_eq!(format!("{:?}", Flags::empty()), "NONE");
|
|
assert_eq!(format!("{:?}", Flags::SOME), "SOME");
|
|
}
|
|
}
|