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Merge pull request #297 from KodrAus/feat/flags-parsing
Add a parser for flags formatted as bar-separated-values
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,96 @@ | ||
#![feature(test)] | ||
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extern crate test; | ||
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use std::{ | ||
fmt::{self, Display}, | ||
str::FromStr, | ||
}; | ||
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bitflags::bitflags! { | ||
struct Flags10: u32 { | ||
const A = 0b0000_0000_0000_0001; | ||
const B = 0b0000_0000_0000_0010; | ||
const C = 0b0000_0000_0000_0100; | ||
const D = 0b0000_0000_0000_1000; | ||
const E = 0b0000_0000_0001_0000; | ||
const F = 0b0000_0000_0010_0000; | ||
const G = 0b0000_0000_0100_0000; | ||
const H = 0b0000_0000_1000_0000; | ||
const I = 0b0000_0001_0000_0000; | ||
const J = 0b0000_0010_0000_0000; | ||
} | ||
} | ||
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impl FromStr for Flags10 { | ||
type Err = bitflags::parser::ParseError; | ||
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fn from_str(flags: &str) -> Result<Self, Self::Err> { | ||
Ok(Flags10(flags.parse()?)) | ||
} | ||
} | ||
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impl Display for Flags10 { | ||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { | ||
Display::fmt(&self.0, f) | ||
} | ||
} | ||
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#[bench] | ||
fn format_flags_1_present(b: &mut test::Bencher) { | ||
b.iter(|| Flags10::J.to_string()) | ||
} | ||
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#[bench] | ||
fn format_flags_5_present(b: &mut test::Bencher) { | ||
b.iter(|| (Flags10::F | Flags10::G | Flags10::H | Flags10::I | Flags10::J).to_string()) | ||
} | ||
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#[bench] | ||
fn format_flags_10_present(b: &mut test::Bencher) { | ||
b.iter(|| { | ||
(Flags10::A | ||
| Flags10::B | ||
| Flags10::C | ||
| Flags10::D | ||
| Flags10::E | ||
| Flags10::F | ||
| Flags10::G | ||
| Flags10::H | ||
| Flags10::I | ||
| Flags10::J) | ||
.to_string() | ||
}) | ||
} | ||
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#[bench] | ||
fn parse_flags_1_10(b: &mut test::Bencher) { | ||
b.iter(|| { | ||
let flags: Flags10 = "J".parse().unwrap(); | ||
flags | ||
}) | ||
} | ||
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#[bench] | ||
fn parse_flags_5_10(b: &mut test::Bencher) { | ||
b.iter(|| { | ||
let flags: Flags10 = "F | G | H | I | J".parse().unwrap(); | ||
flags | ||
}) | ||
} | ||
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#[bench] | ||
fn parse_flags_10_10(b: &mut test::Bencher) { | ||
b.iter(|| { | ||
let flags: Flags10 = "A | B | C | D | E | F | G | H | I | J".parse().unwrap(); | ||
flags | ||
}) | ||
} | ||
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#[bench] | ||
fn parse_flags_1_10_hex(b: &mut test::Bencher) { | ||
b.iter(|| { | ||
let flags: Flags10 = "0xFF".parse().unwrap(); | ||
flags | ||
}) | ||
} |
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Original file line number | Diff line number | Diff line change |
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//! An example of implementing Rust's standard formatting and parsing traits for flags types. | ||
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use core::{fmt, str}; | ||
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fn main() -> Result<(), bitflags::parser::ParseError> { | ||
bitflags::bitflags! { | ||
// You can `#[derive]` the `Debug` trait, but implementing it manually | ||
// can produce output like `A | B` instead of `Flags(A | B)`. | ||
// #[derive(Debug)] | ||
#[derive(PartialEq, Eq)] | ||
pub struct Flags: u32 { | ||
const A = 1; | ||
const B = 2; | ||
const C = 4; | ||
const D = 8; | ||
} | ||
} | ||
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impl fmt::Debug for Flags { | ||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { | ||
fmt::Debug::fmt(&self.0, f) | ||
} | ||
} | ||
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impl fmt::Display for Flags { | ||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { | ||
fmt::Display::fmt(&self.0, f) | ||
} | ||
} | ||
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impl str::FromStr for Flags { | ||
type Err = bitflags::parser::ParseError; | ||
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fn from_str(flags: &str) -> Result<Self, Self::Err> { | ||
Ok(Self(flags.parse()?)) | ||
} | ||
} | ||
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let flags = Flags::A | Flags::B; | ||
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println!("{}", flags); | ||
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let formatted = flags.to_string(); | ||
let parsed: Flags = formatted.parse()?; | ||
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assert_eq!(flags, parsed); | ||
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Ok(()) | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,36 @@ | ||
//! An example of implementing `serde::Serialize` and `serde::Deserialize`. | ||
//! The `#[serde(transparent)]` attribute is recommended to serialize directly | ||
//! to the underlying bits type without wrapping it in a `serde` newtype. | ||
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#[cfg(feature = "serde")] | ||
fn main() { | ||
use serde_derive::*; | ||
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bitflags::bitflags! { | ||
#[derive(Serialize, Deserialize, Debug, PartialEq, Eq)] | ||
#[serde(transparent)] | ||
pub struct Flags: u32 { | ||
const A = 1; | ||
const B = 2; | ||
const C = 4; | ||
const D = 8; | ||
} | ||
} | ||
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let flags = Flags::A | Flags::B; | ||
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let serialized = serde_json::to_string(&flags).unwrap(); | ||
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println!("{:?} -> {}", flags, serialized); | ||
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assert_eq!(serialized, r#""A | B""#); | ||
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let deserialized: Flags = serde_json::from_str(&serialized).unwrap(); | ||
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println!("{} -> {:?}", serialized, flags); | ||
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assert_eq!(deserialized, flags); | ||
} | ||
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#[cfg(not(feature = "serde"))] | ||
fn main() {} |
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