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authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
commita990de90fe41456a23e58bd087d2f107d321f3a1 (patch)
tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/bitflags/src/parser.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.zip
Deleted vendor folder
Diffstat (limited to 'vendor/bitflags/src/parser.rs')
-rw-r--r--vendor/bitflags/src/parser.rs247
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diff --git a/vendor/bitflags/src/parser.rs b/vendor/bitflags/src/parser.rs
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-/*!
-Parsing flags from text.
-
-Format and parse a flags value as text using the following grammar:
-
-- _Flags:_ (_Whitespace_ _Flag_ _Whitespace_)`|`*
-- _Flag:_ _Name_ | _Hex Number_
-- _Name:_ The name of any defined flag
-- _Hex Number_: `0x`([0-9a-fA-F])*
-- _Whitespace_: (\s)*
-
-As an example, this is how `Flags::A | Flags::B | 0x0c` can be represented as text:
-
-```text
-A | B | 0x0c
-```
-
-Alternatively, it could be represented without whitespace:
-
-```text
-A|B|0x0C
-```
-
-Note that identifiers are *case-sensitive*, so the following is *not equivalent*:
-
-```text
-a|b|0x0C
-```
-*/
-
-#![allow(clippy::let_unit_value)]
-
-use core::fmt::{self, Write};
-
-use crate::{Bits, Flags};
-
-/**
-Write a flags value as text.
-
-Any bits that aren't part of a contained flag will be formatted as a hex number.
-*/
-pub fn to_writer<B: Flags>(flags: &B, mut writer: impl Write) -> Result<(), fmt::Error>
-where
- B::Bits: WriteHex,
-{
- // A formatter for bitflags that produces text output like:
- //
- // A | B | 0xf6
- //
- // The names of set flags are written in a bar-separated-format,
- // followed by a hex number of any remaining bits that are set
- // but don't correspond to any flags.
-
- // Iterate over known flag values
- let mut first = true;
- let mut iter = flags.iter_names();
- for (name, _) in &mut iter {
- if !first {
- writer.write_str(" | ")?;
- }
-
- first = false;
- writer.write_str(name)?;
- }
-
- // Append any extra bits that correspond to flags to the end of the format
- let remaining = iter.remaining().bits();
- if remaining != B::Bits::EMPTY {
- if !first {
- writer.write_str(" | ")?;
- }
-
- writer.write_str("0x")?;
- remaining.write_hex(writer)?;
- }
-
- fmt::Result::Ok(())
-}
-
-pub(crate) struct AsDisplay<'a, B>(pub(crate) &'a B);
-
-impl<'a, B: Flags> fmt::Display for AsDisplay<'a, B>
-where
- B::Bits: WriteHex,
-{
- fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
- to_writer(self.0, f)
- }
-}
-
-/**
-Parse a flags value from text.
-
-This function will fail on any names that don't correspond to defined flags.
-Unknown bits will be retained.
-*/
-pub fn from_str<B: Flags>(input: &str) -> Result<B, ParseError>
-where
- B::Bits: ParseHex,
-{
- let mut parsed_flags = B::empty();
-
- // If the input is empty then return an empty set of flags
- if input.trim().is_empty() {
- return Ok(parsed_flags);
- }
-
- for flag in input.split('|') {
- let flag = flag.trim();
-
- // If the flag is empty then we've got missing input
- if flag.is_empty() {
- return Err(ParseError::empty_flag());
- }
-
- // If the flag starts with `0x` then it's a hex number
- // Parse it directly to the underlying bits type
- let parsed_flag = if let Some(flag) = flag.strip_prefix("0x") {
- let bits =
- <B::Bits>::parse_hex(flag).map_err(|_| ParseError::invalid_hex_flag(flag))?;
-
- B::from_bits_retain(bits)
- }
- // Otherwise the flag is a name
- // The generated flags type will determine whether
- // or not it's a valid identifier
- else {
- B::from_name(flag).ok_or_else(|| ParseError::invalid_named_flag(flag))?
- };
-
- parsed_flags.insert(parsed_flag);
- }
-
- Ok(parsed_flags)
-}
-
-/**
-Encode a value as a hex string.
-
-Implementors of this trait should not write the `0x` prefix.
-*/
-pub trait WriteHex {
- /// Write the value as hex.
- fn write_hex<W: fmt::Write>(&self, writer: W) -> fmt::Result;
-}
-
-/**
-Parse a value from a hex string.
-*/
-pub trait ParseHex {
- /// Parse the value from hex.
- fn parse_hex(input: &str) -> Result<Self, ParseError>
- where
- Self: Sized;
-}
-
-/// An error encountered while parsing flags from text.
-#[derive(Debug)]
-pub struct ParseError(ParseErrorKind);
-
-#[derive(Debug)]
-#[allow(clippy::enum_variant_names)]
-enum ParseErrorKind {
- EmptyFlag,
- InvalidNamedFlag {
- #[cfg(not(feature = "std"))]
- got: (),
- #[cfg(feature = "std")]
- got: String,
- },
- InvalidHexFlag {
- #[cfg(not(feature = "std"))]
- got: (),
- #[cfg(feature = "std")]
- got: String,
- },
-}
-
-impl ParseError {
- /// An invalid hex flag was encountered.
- pub fn invalid_hex_flag(flag: impl fmt::Display) -> Self {
- let _flag = flag;
-
- let got = {
- #[cfg(feature = "std")]
- {
- _flag.to_string()
- }
- };
-
- ParseError(ParseErrorKind::InvalidHexFlag { got })
- }
-
- /// A named flag that doesn't correspond to any on the flags type was encountered.
- pub fn invalid_named_flag(flag: impl fmt::Display) -> Self {
- let _flag = flag;
-
- let got = {
- #[cfg(feature = "std")]
- {
- _flag.to_string()
- }
- };
-
- ParseError(ParseErrorKind::InvalidNamedFlag { got })
- }
-
- /// A hex or named flag wasn't found between separators.
- pub const fn empty_flag() -> Self {
- ParseError(ParseErrorKind::EmptyFlag)
- }
-}
-
-impl fmt::Display for ParseError {
- fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
- match &self.0 {
- ParseErrorKind::InvalidNamedFlag { got } => {
- let _got = got;
-
- write!(f, "unrecognized named flag")?;
-
- #[cfg(feature = "std")]
- {
- write!(f, " `{}`", _got)?;
- }
- }
- ParseErrorKind::InvalidHexFlag { got } => {
- let _got = got;
-
- write!(f, "invalid hex flag")?;
-
- #[cfg(feature = "std")]
- {
- write!(f, " `{}`", _got)?;
- }
- }
- ParseErrorKind::EmptyFlag => {
- write!(f, "encountered empty flag")?;
- }
- }
-
- Ok(())
- }
-}
-
-#[cfg(feature = "std")]
-impl std::error::Error for ParseError {}