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Diffstat (limited to 'bitflags/src/lib.rs')
| -rw-r--r-- | bitflags/src/lib.rs | 1430 |
1 files changed, 0 insertions, 1430 deletions
diff --git a/bitflags/src/lib.rs b/bitflags/src/lib.rs deleted file mode 100644 index 3929b02..0000000 --- a/bitflags/src/lib.rs +++ /dev/null @@ -1,1430 +0,0 @@ -// Copyright 2014 The Rust Project Developers. See the COPYRIGHT -// file at the top-level directory of this distribution and at -// http://rust-lang.org/COPYRIGHT. -// -// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or -// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -//! A typesafe bitmask flag generator useful for sets of C-style bitmask flags. -//! It can be used for creating typesafe wrappers around C APIs. -//! -//! The `bitflags!` macro generates a `struct` that manages a set of flags. The -//! flags should only be defined for integer types, otherwise unexpected type -//! errors may occur at compile time. -//! -//! # Example -//! -//! ``` -//! #[macro_use] -//! extern crate bitflags; -//! -//! bitflags! { -//! struct Flags: u32 { -//! const A = 0b00000001; -//! const B = 0b00000010; -//! const C = 0b00000100; -//! const ABC = Self::A.bits | Self::B.bits | Self::C.bits; -//! } -//! } -//! -//! fn main() { -//! 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 -//! } -//! ``` -//! -//! See [`example_generated::Flags`](./example_generated/struct.Flags.html) for documentation of code -//! generated by the above `bitflags!` expansion. -//! -//! The generated `struct`s can also be extended with type and trait -//! implementations: -//! -//! ``` -//! #[macro_use] -//! extern crate bitflags; -//! -//! use std::fmt; -//! -//! bitflags! { -//! struct Flags: u32 { -//! const A = 0b00000001; -//! const B = 0b00000010; -//! } -//! } -//! -//! impl Flags { -//! pub fn clear(&mut self) { -//! self.bits = 0; // The `bits` field can be accessed from within the -//! // same module where the `bitflags!` macro was invoked. -//! } -//! } -//! -//! impl fmt::Display for Flags { -//! fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { -//! write!(f, "hi!") -//! } -//! } -//! -//! fn main() { -//! let mut flags = Flags::A | Flags::B; -//! flags.clear(); -//! assert!(flags.is_empty()); -//! assert_eq!(format!("{}", flags), "hi!"); -//! assert_eq!(format!("{:?}", Flags::A | Flags::B), "A | B"); -//! assert_eq!(format!("{:?}", Flags::B), "B"); -//! } -//! ``` -//! -//! # Visibility -//! -//! The generated struct and its associated flag constants are not exported -//! out of the current module by default. A definition can be exported out of -//! the current module by adding `pub` before `flags`: -//! -//! ``` -//! #[macro_use] -//! extern crate bitflags; -//! -//! mod example { -//! bitflags! { -//! pub struct Flags1: u32 { -//! const A = 0b00000001; -//! } -//! } -//! bitflags! { -//! # pub -//! struct Flags2: u32 { -//! const B = 0b00000010; -//! } -//! } -//! } -//! -//! fn main() { -//! let flag1 = example::Flags1::A; -//! let flag2 = example::Flags2::B; // error: const `B` is private -//! } -//! ``` -//! -//! # Attributes -//! -//! Attributes can be attached to the generated `struct` by placing them -//! before the `flags` keyword. -//! -//! # Trait implementations -//! -//! The `Copy`, `Clone`, `PartialEq`, `Eq`, `PartialOrd`, `Ord` and `Hash` -//! traits automatically derived for the `struct` using the `derive` attribute. -//! Additional traits can be derived by providing an explicit `derive` -//! attribute on `flags`. -//! -//! The `Extend` and `FromIterator` traits are implemented for the `struct`, -//! too: `Extend` adds the union of the instances of the `struct` iterated over, -//! while `FromIterator` calculates the union. -//! -//! The `Binary`, `Debug`, `LowerHex`, `Octal` and `UpperHex` trait is also -//! implemented by displaying the bits value of the internal struct. -//! -//! ## Operators -//! -//! The following operator traits are implemented for the generated `struct`: -//! -//! - `BitOr` and `BitOrAssign`: union -//! - `BitAnd` and `BitAndAssign`: intersection -//! - `BitXor` and `BitXorAssign`: toggle -//! - `Sub` and `SubAssign`: set difference -//! - `Not`: set complement -//! -//! # Methods -//! -//! The following methods are defined for the generated `struct`: -//! -//! - `empty`: an empty set of flags -//! - `all`: the set of all defined flags -//! - `bits`: the raw value of the flags currently stored -//! - `from_bits`: convert from underlying bit representation, unless that -//! representation contains bits that do not correspond to a -//! defined flag -//! - `from_bits_truncate`: convert from underlying bit representation, dropping -//! any bits that do not correspond to defined flags -//! - `from_bits_unchecked`: convert from underlying bit representation, keeping -//! all bits (even those not corresponding to defined -//! flags) -//! - `is_empty`: `true` if no flags are currently stored -//! - `is_all`: `true` if currently set flags exactly equal all defined flags -//! - `intersects`: `true` if there are flags common to both `self` and `other` -//! - `contains`: `true` all of the flags in `other` are contained within `self` -//! - `insert`: inserts the specified flags in-place -//! - `remove`: removes the specified flags in-place -//! - `toggle`: the specified flags will be inserted if not present, and removed -//! if they are. -//! - `set`: inserts or removes the specified flags depending on the passed value -//! -//! ## Default -//! -//! The `Default` trait is not automatically implemented for the generated struct. -//! -//! If your default value is equal to `0` (which is the same value as calling `empty()` -//! on the generated struct), you can simply derive `Default`: -//! -//! ``` -//! #[macro_use] -//! extern crate bitflags; -//! -//! bitflags! { -//! // Results in default value with bits: 0 -//! #[derive(Default)] -//! struct Flags: u32 { -//! const A = 0b00000001; -//! const B = 0b00000010; -//! const C = 0b00000100; -//! } -//! } -//! -//! fn main() { -//! let derived_default: Flags = Default::default(); -//! assert_eq!(derived_default.bits(), 0); -//! } -//! ``` -//! -//! If your default value is not equal to `0` you need to implement `Default` yourself: -//! -//! ``` -//! #[macro_use] -//! extern crate bitflags; -//! -//! bitflags! { -//! struct Flags: u32 { -//! const A = 0b00000001; -//! const B = 0b00000010; -//! const C = 0b00000100; -//! } -//! } -//! -//! // explicit `Default` implementation -//! impl Default for Flags { -//! fn default() -> Flags { -//! Flags::A | Flags::C -//! } -//! } -//! -//! fn main() { -//! let implemented_default: Flags = Default::default(); -//! assert_eq!(implemented_default, (Flags::A | Flags::C)); -//! } -//! ``` -//! -//! # Zero Flags -//! -//! Flags with a value equal to zero will have some strange behavior that one should be aware of. -//! -//! ``` -//! #[macro_use] -//! extern crate bitflags; -//! -//! bitflags! { -//! struct Flags: u32 { -//! const NONE = 0b00000000; -//! const SOME = 0b00000001; -//! } -//! } -//! -//! fn main() { -//! let empty = Flags::empty(); -//! let none = Flags::NONE; -//! let some = Flags::SOME; -//! -//! // Zero flags are treated as always present -//! assert!(empty.contains(Flags::NONE)); -//! assert!(none.contains(Flags::NONE)); -//! assert!(some.contains(Flags::NONE)); -//! -//! // Zero flags will be ignored when testing for emptiness -//! assert!(none.is_empty()); -//! } -//! ``` - -#![no_std] -#![doc(html_root_url = "https://docs.rs/bitflags/1.2.1")] - -#[cfg(test)] -#[macro_use] -extern crate std; - -// Re-export libcore using an alias so that the macros can work without -// requiring `extern crate core` downstream. -#[doc(hidden)] -pub extern crate core as _core; - -/// The macro used to generate the flag structure. -/// -/// See the [crate level docs](../bitflags/index.html) for complete documentation. -/// -/// # Example -/// -/// ``` -/// #[macro_use] -/// extern crate bitflags; -/// -/// bitflags! { -/// struct Flags: u32 { -/// const A = 0b00000001; -/// const B = 0b00000010; -/// const C = 0b00000100; -/// const ABC = Self::A.bits | Self::B.bits | Self::C.bits; -/// } -/// } -/// -/// fn main() { -/// 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 -/// } -/// ``` -/// -/// The generated `struct`s can also be extended with type and trait -/// implementations: -/// -/// ``` -/// #[macro_use] -/// extern crate bitflags; -/// -/// use std::fmt; -/// -/// bitflags! { -/// struct Flags: u32 { -/// const A = 0b00000001; -/// const B = 0b00000010; -/// } -/// } -/// -/// impl Flags { -/// pub fn clear(&mut self) { -/// self.bits = 0; // The `bits` field can be accessed from within the -/// // same module where the `bitflags!` macro was invoked. -/// } -/// } -/// -/// impl fmt::Display for Flags { -/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { -/// write!(f, "hi!") -/// } -/// } -/// -/// fn main() { -/// let mut flags = Flags::A | Flags::B; -/// flags.clear(); -/// assert!(flags.is_empty()); -/// assert_eq!(format!("{}", flags), "hi!"); -/// assert_eq!(format!("{:?}", Flags::A | Flags::B), "A | B"); -/// assert_eq!(format!("{:?}", Flags::B), "B"); -/// } -/// ``` -#[macro_export(local_inner_macros)] -macro_rules! bitflags { - ( - $(#[$outer:meta])* - pub struct $BitFlags:ident: $T:ty { - $( - $(#[$inner:ident $($args:tt)*])* - const $Flag:ident = $value:expr; - )+ - } - ) => { - __bitflags! { - $(#[$outer])* - (pub) $BitFlags: $T { - $( - $(#[$inner $($args)*])* - $Flag = $value; - )+ - } - } - }; - ( - $(#[$outer:meta])* - struct $BitFlags:ident: $T:ty { - $( - $(#[$inner:ident $($args:tt)*])* - const $Flag:ident = $value:expr; - )+ - } - ) => { - __bitflags! { - $(#[$outer])* - () $BitFlags: $T { - $( - $(#[$inner $($args)*])* - $Flag = $value; - )+ - } - } - }; - ( - $(#[$outer:meta])* - pub ($($vis:tt)+) struct $BitFlags:ident: $T:ty { - $( - $(#[$inner:ident $($args:tt)*])* - const $Flag:ident = $value:expr; - )+ - } - ) => { - __bitflags! { - $(#[$outer])* - (pub ($($vis)+)) $BitFlags: $T { - $( - $(#[$inner $($args)*])* - $Flag = $value; - )+ - } - } - }; -} - -#[macro_export(local_inner_macros)] -#[doc(hidden)] -macro_rules! __bitflags { - ( - $(#[$outer:meta])* - ($($vis:tt)*) $BitFlags:ident: $T:ty { - $( - $(#[$inner:ident $($args:tt)*])* - $Flag:ident = $value:expr; - )+ - } - ) => { - $(#[$outer])* - #[derive(Copy, PartialEq, Eq, Clone, PartialOrd, Ord, Hash)] - $($vis)* struct $BitFlags { - bits: $T, - } - - __impl_bitflags! { - $BitFlags: $T { - $( - $(#[$inner $($args)*])* - $Flag = $value; - )+ - } - } - }; -} - -#[macro_export(local_inner_macros)] -#[doc(hidden)] -#[cfg(bitflags_const_fn)] -macro_rules! __fn_bitflags { - ( - $(# $attr_args:tt)* - const fn $($item:tt)* - ) => { - $(# $attr_args)* - const fn $($item)* - }; - ( - $(# $attr_args:tt)* - pub const fn $($item:tt)* - ) => { - $(# $attr_args)* - pub const fn $($item)* - }; - ( - $(# $attr_args:tt)* - pub const unsafe fn $($item:tt)* - ) => { - $(# $attr_args)* - pub const unsafe fn $($item)* - }; -} - -#[macro_export(local_inner_macros)] -#[doc(hidden)] -#[cfg(not(bitflags_const_fn))] -macro_rules! __fn_bitflags { - ( - $(# $attr_args:tt)* - const fn $($item:tt)* - ) => { - $(# $attr_args)* - fn $($item)* - }; - ( - $(# $attr_args:tt)* - pub const fn $($item:tt)* - ) => { - $(# $attr_args)* - pub fn $($item)* - }; - ( - $(# $attr_args:tt)* - pub const unsafe fn $($item:tt)* - ) => { - $(# $attr_args)* - pub unsafe fn $($item)* - }; -} - -#[macro_export(local_inner_macros)] -#[doc(hidden)] -macro_rules! __impl_bitflags { - ( - $BitFlags:ident: $T:ty { - $( - $(#[$attr:ident $($args:tt)*])* - $Flag:ident = $value:expr; - )+ - } - ) => { - impl $crate::_core::fmt::Debug for $BitFlags { - fn fmt(&self, f: &mut $crate::_core::fmt::Formatter) -> $crate::_core::fmt::Result { - // This convoluted approach is to handle #[cfg]-based flag - // omission correctly. For example it needs to support: - // - // #[cfg(unix)] const A: Flag = /* ... */; - // #[cfg(windows)] const B: Flag = /* ... */; - - // Unconditionally define a check for every flag, even disabled - // ones. - #[allow(non_snake_case)] - trait __BitFlags { - $( - #[inline] - fn $Flag(&self) -> bool { false } - )+ - } - - // Conditionally override the check for just those flags that - // are not #[cfg]ed away. - impl __BitFlags for $BitFlags { - $( - __impl_bitflags! { - #[allow(deprecated)] - #[inline] - $(? #[$attr $($args)*])* - fn $Flag(&self) -> bool { - if Self::$Flag.bits == 0 && self.bits != 0 { - false - } else { - self.bits & Self::$Flag.bits == Self::$Flag.bits - } - } - } - )+ - } - - let mut first = true; - $( - if <$BitFlags as __BitFlags>::$Flag(self) { - if !first { - f.write_str(" | ")?; - } - first = false; - f.write_str(__bitflags_stringify!($Flag))?; - } - )+ - let extra_bits = self.bits & !$BitFlags::all().bits(); - if extra_bits != 0 { - if !first { - f.write_str(" | ")?; - } - first = false; - f.write_str("0x")?; - $crate::_core::fmt::LowerHex::fmt(&extra_bits, f)?; - } - if first { - f.write_str("(empty)")?; - } - Ok(()) - } - } - impl $crate::_core::fmt::Binary for $BitFlags { - fn fmt(&self, f: &mut $crate::_core::fmt::Formatter) -> $crate::_core::fmt::Result { - $crate::_core::fmt::Binary::fmt(&self.bits, f) - } - } - impl $crate::_core::fmt::Octal for $BitFlags { - fn fmt(&self, f: &mut $crate::_core::fmt::Formatter) -> $crate::_core::fmt::Result { - $crate::_core::fmt::Octal::fmt(&self.bits, f) - } - } - impl $crate::_core::fmt::LowerHex for $BitFlags { - fn fmt(&self, f: &mut $crate::_core::fmt::Formatter) -> $crate::_core::fmt::Result { - $crate::_core::fmt::LowerHex::fmt(&self.bits, f) - } - } - impl $crate::_core::fmt::UpperHex for $BitFlags { - fn fmt(&self, f: &mut $crate::_core::fmt::Formatter) -> $crate::_core::fmt::Result { - $crate::_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 { - $( - const $Flag: $T = 0; - )+ - } - impl __BitFlags for $BitFlags { - $( - __impl_bitflags! { - #[allow(deprecated)] - $(? #[$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) -> $crate::_core::option::Option<$BitFlags> { - if (bits & !$BitFlags::all().bits()) == 0 { - $crate::_core::option::Option::Some($BitFlags { bits }) - } else { - $crate::_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! { - /// Convert from underlying bit representation, preserving all - /// bits (even those not corresponding to a defined flag). - #[inline] - pub const unsafe fn from_bits_unchecked(bits: $T) -> $BitFlags { - $BitFlags { 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::_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::_core::ops::BitOrAssign for $BitFlags { - - /// Adds the set of flags. - #[inline] - fn bitor_assign(&mut self, other: $BitFlags) { - self.bits |= other.bits; - } - } - - impl $crate::_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::_core::ops::BitXorAssign for $BitFlags { - - /// Toggles the set of flags. - #[inline] - fn bitxor_assign(&mut self, other: $BitFlags) { - self.bits ^= other.bits; - } - } - - impl $crate::_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::_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::_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::_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::_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 $crate::_core::iter::Extend<$BitFlags> for $BitFlags { - fn extend<T: $crate::_core::iter::IntoIterator<Item=$BitFlags>>(&mut self, iterator: T) { - for item in iterator { - self.insert(item) - } - } - } - - impl $crate::_core::iter::FromIterator<$BitFlags> for $BitFlags { - fn from_iter<T: $crate::_core::iter::IntoIterator<Item=$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_from_bits_unchecked() { - let extra = unsafe { Flags::from_bits_unchecked(0b1000) }; - assert_eq!(unsafe { Flags::from_bits_unchecked(0) }, Flags::empty()); - assert_eq!(unsafe { Flags::from_bits_unchecked(0b1) }, Flags::A); - assert_eq!(unsafe { Flags::from_bits_unchecked(0b10) }, Flags::B); - assert_eq!(unsafe { Flags::from_bits_unchecked(0b11) }, (Flags::A | Flags::B)); - assert_eq!(unsafe { Flags::from_bits_unchecked(0b1000) }, (extra | Flags::empty())); - assert_eq!(unsafe { Flags::from_bits_unchecked(0b1001) }, (extra | Flags::A)); - } - - #[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_operators_unchecked() { - let extra = unsafe { Flags::from_bits_unchecked(0b1000) }; - let e1 = Flags::A | Flags::C | extra; - let e2 = Flags::B | Flags::C; - assert_eq!((e1 | e2), (Flags::ABC | extra)); // union - assert_eq!((e1 & e2), Flags::C); // intersection - assert_eq!((e1 - e2), (Flags::A | extra)); // set difference - assert_eq!(!e2, Flags::A); // set complement - assert_eq!(!e1, Flags::B); // set complement - assert_eq!(e1 ^ e2, Flags::A | Flags::B | extra); // toggle - let mut e3 = e1; - e3.toggle(e2); - assert_eq!(e3, Flags::A | Flags::B | extra); - } - - #[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"); - let extra = unsafe { Flags::from_bits_unchecked(0xb8) }; - assert_eq!(format!("{:?}", extra), "0xb8"); - assert_eq!(format!("{:?}", Flags::A | extra), "A | 0xb8"); - assert_eq!(format!("{:?}", Flags::ABC | extra), "A | B | C | ABC | 0xb8"); - } - - #[test] - fn test_binary() { - assert_eq!(format!("{:b}", Flags::ABC), "111"); - assert_eq!(format!("{:#b}", Flags::ABC), "0b111"); - let extra = unsafe { Flags::from_bits_unchecked(0b1010000) }; - assert_eq!(format!("{:b}", Flags::ABC | extra), "1010111"); - assert_eq!(format!("{:#b}", Flags::ABC | extra), "0b1010111"); - } - - #[test] - fn test_octal() { - assert_eq!(format!("{:o}", LongFlags::LONG_A), "177777"); - assert_eq!(format!("{:#o}", LongFlags::LONG_A), "0o177777"); - let extra = unsafe { LongFlags::from_bits_unchecked(0o5000000) }; - assert_eq!(format!("{:o}", LongFlags::LONG_A | extra), "5177777"); - assert_eq!(format!("{:#o}", LongFlags::LONG_A | extra), "0o5177777"); - } - - #[test] - fn test_lowerhex() { - assert_eq!(format!("{:x}", LongFlags::LONG_A), "ffff"); - assert_eq!(format!("{:#x}", LongFlags::LONG_A), "0xffff"); - let extra = unsafe { LongFlags::from_bits_unchecked(0xe00000) }; - assert_eq!(format!("{:x}", LongFlags::LONG_A | extra), "e0ffff"); - assert_eq!(format!("{:#x}", LongFlags::LONG_A | extra), "0xe0ffff"); - } - - #[test] - fn test_upperhex() { - assert_eq!(format!("{:X}", LongFlags::LONG_A), "FFFF"); - assert_eq!(format!("{:#X}", LongFlags::LONG_A), "0xFFFF"); - let extra = unsafe { LongFlags::from_bits_unchecked(0xe00000) }; - assert_eq!(format!("{:X}", LongFlags::LONG_A | extra), "E0FFFF"); - assert_eq!(format!("{:#X}", LongFlags::LONG_A | extra), "0xE0FFFF"); - } - - 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"); - } -} |