Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 487 insertions, 0 deletions

diff --git a/third_party/rust/nom/src/internal.rs b/third_party/rust/nom/src/internal.rs
new file mode 100644
index 0000000000..8a3c6a14d7
--- /dev/null
+++ b/third_party/rust/nom/src/internal.rs
@@ -0,0 +1,487 @@
+//! Basic types to build the parsers
+
+use self::Needed::*;
+use crate::error::{self, ErrorKind};
+use crate::lib::std::fmt;
+use core::num::NonZeroUsize;
+
+/// Holds the result of parsing functions
+///
+/// It depends on the input type `I`, the output type `O`, and the error type `E`
+/// (by default `(I, nom::ErrorKind)`)
+///
+/// The `Ok` side is a pair containing the remainder of the input (the part of the data that
+/// was not parsed) and the produced value. The `Err` side contains an instance of `nom::Err`.
+///
+/// Outside of the parsing code, you can use the [Finish::finish] method to convert
+/// it to a more common result type
+pub type IResult<I, O, E = error::Error<I>> = Result<(I, O), Err<E>>;
+
+/// Helper trait to convert a parser's result to a more manageable type
+pub trait Finish<I, O, E> {
+  /// converts the parser's result to a type that is more consumable by error
+  /// management libraries. It keeps the same `Ok` branch, and merges `Err::Error`
+  /// and `Err::Failure` into the `Err` side.
+  ///
+  /// *warning*: if the result is `Err(Err::Incomplete(_))`, this method will panic.
+  /// - "complete" parsers: It will not be an issue, `Incomplete` is never used
+  /// - "streaming" parsers: `Incomplete` will be returned if there's not enough data
+  /// for the parser to decide, and you should gather more data before parsing again.
+  /// Once the parser returns either `Ok(_)`, `Err(Err::Error(_))` or `Err(Err::Failure(_))`,
+  /// you can get out of the parsing loop and call `finish()` on the parser's result
+  fn finish(self) -> Result<(I, O), E>;
+}
+
+impl<I, O, E> Finish<I, O, E> for IResult<I, O, E> {
+  fn finish(self) -> Result<(I, O), E> {
+    match self {
+      Ok(res) => Ok(res),
+      Err(Err::Error(e)) | Err(Err::Failure(e)) => Err(e),
+      Err(Err::Incomplete(_)) => {
+        panic!("Cannot call `finish()` on `Err(Err::Incomplete(_))`: this result means that the parser does not have enough data to decide, you should gather more data and try to reapply  the parser instead")
+      }
+    }
+  }
+}
+
+/// Contains information on needed data if a parser returned `Incomplete`
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+#[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))]
+pub enum Needed {
+  /// Needs more data, but we do not know how much
+  Unknown,
+  /// Contains the required data size in bytes
+  Size(NonZeroUsize),
+}
+
+impl Needed {
+  /// Creates `Needed` instance, returns `Needed::Unknown` if the argument is zero
+  pub fn new(s: usize) -> Self {
+    match NonZeroUsize::new(s) {
+      Some(sz) => Needed::Size(sz),
+      None => Needed::Unknown,
+    }
+  }
+
+  /// Indicates if we know how many bytes we need
+  pub fn is_known(&self) -> bool {
+    *self != Unknown
+  }
+
+  /// Maps a `Needed` to `Needed` by applying a function to a contained `Size` value.
+  #[inline]
+  pub fn map<F: Fn(NonZeroUsize) -> usize>(self, f: F) -> Needed {
+    match self {
+      Unknown => Unknown,
+      Size(n) => Needed::new(f(n)),
+    }
+  }
+}
+
+/// The `Err` enum indicates the parser was not successful
+///
+/// It has three cases:
+///
+/// * `Incomplete` indicates that more data is needed to decide. The `Needed` enum
+/// can contain how many additional bytes are necessary. If you are sure your parser
+/// is working on full data, you can wrap your parser with the `complete` combinator
+/// to transform that case in `Error`
+/// * `Error` means some parser did not succeed, but another one might (as an example,
+/// when testing different branches of an `alt` combinator)
+/// * `Failure` indicates an unrecoverable error. As an example, if you recognize a prefix
+/// to decide on the next parser to apply, and that parser fails, you know there's no need
+/// to try other parsers, you were already in the right branch, so the data is invalid
+///
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))]
+pub enum Err<E> {
+  /// There was not enough data
+  Incomplete(Needed),
+  /// The parser had an error (recoverable)
+  Error(E),
+  /// The parser had an unrecoverable error: we got to the right
+  /// branch and we know other branches won't work, so backtrack
+  /// as fast as possible
+  Failure(E),
+}
+
+impl<E> Err<E> {
+  /// Tests if the result is Incomplete
+  pub fn is_incomplete(&self) -> bool {
+    if let Err::Incomplete(_) = self {
+      true
+    } else {
+      false
+    }
+  }
+
+  /// Applies the given function to the inner error
+  pub fn map<E2, F>(self, f: F) -> Err<E2>
+  where
+    F: FnOnce(E) -> E2,
+  {
+    match self {
+      Err::Incomplete(n) => Err::Incomplete(n),
+      Err::Failure(t) => Err::Failure(f(t)),
+      Err::Error(t) => Err::Error(f(t)),
+    }
+  }
+
+  /// Automatically converts between errors if the underlying type supports it
+  pub fn convert<F>(e: Err<F>) -> Self
+  where
+    E: From<F>,
+  {
+    e.map(crate::lib::std::convert::Into::into)
+  }
+}
+
+impl<T> Err<(T, ErrorKind)> {
+  /// Maps `Err<(T, ErrorKind)>` to `Err<(U, ErrorKind)>` with the given `F: T -> U`
+  pub fn map_input<U, F>(self, f: F) -> Err<(U, ErrorKind)>
+  where
+    F: FnOnce(T) -> U,
+  {
+    match self {
+      Err::Incomplete(n) => Err::Incomplete(n),
+      Err::Failure((input, k)) => Err::Failure((f(input), k)),
+      Err::Error((input, k)) => Err::Error((f(input), k)),
+    }
+  }
+}
+
+impl<T> Err<error::Error<T>> {
+  /// Maps `Err<error::Error<T>>` to `Err<error::Error<U>>` with the given `F: T -> U`
+  pub fn map_input<U, F>(self, f: F) -> Err<error::Error<U>>
+  where
+    F: FnOnce(T) -> U,
+  {
+    match self {
+      Err::Incomplete(n) => Err::Incomplete(n),
+      Err::Failure(error::Error { input, code }) => Err::Failure(error::Error {
+        input: f(input),
+        code,
+      }),
+      Err::Error(error::Error { input, code }) => Err::Error(error::Error {
+        input: f(input),
+        code,
+      }),
+    }
+  }
+}
+
+#[cfg(feature = "alloc")]
+use crate::lib::std::{borrow::ToOwned, string::String, vec::Vec};
+#[cfg(feature = "alloc")]
+impl Err<(&[u8], ErrorKind)> {
+  /// Obtaining ownership
+  #[cfg_attr(feature = "docsrs", doc(cfg(feature = "alloc")))]
+  pub fn to_owned(self) -> Err<(Vec<u8>, ErrorKind)> {
+    self.map_input(ToOwned::to_owned)
+  }
+}
+
+#[cfg(feature = "alloc")]
+impl Err<(&str, ErrorKind)> {
+  /// Obtaining ownership
+  #[cfg_attr(feature = "docsrs", doc(cfg(feature = "alloc")))]
+  pub fn to_owned(self) -> Err<(String, ErrorKind)> {
+    self.map_input(ToOwned::to_owned)
+  }
+}
+
+#[cfg(feature = "alloc")]
+impl Err<error::Error<&[u8]>> {
+  /// Obtaining ownership
+  #[cfg_attr(feature = "docsrs", doc(cfg(feature = "alloc")))]
+  pub fn to_owned(self) -> Err<error::Error<Vec<u8>>> {
+    self.map_input(ToOwned::to_owned)
+  }
+}
+
+#[cfg(feature = "alloc")]
+impl Err<error::Error<&str>> {
+  /// Obtaining ownership
+  #[cfg_attr(feature = "docsrs", doc(cfg(feature = "alloc")))]
+  pub fn to_owned(self) -> Err<error::Error<String>> {
+    self.map_input(ToOwned::to_owned)
+  }
+}
+
+impl<E: Eq> Eq for Err<E> {}
+
+impl<E> fmt::Display for Err<E>
+where
+  E: fmt::Debug,
+{
+  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+    match self {
+      Err::Incomplete(Needed::Size(u)) => write!(f, "Parsing requires {} bytes/chars", u),
+      Err::Incomplete(Needed::Unknown) => write!(f, "Parsing requires more data"),
+      Err::Failure(c) => write!(f, "Parsing Failure: {:?}", c),
+      Err::Error(c) => write!(f, "Parsing Error: {:?}", c),
+    }
+  }
+}
+
+#[cfg(feature = "std")]
+use std::error::Error;
+
+#[cfg(feature = "std")]
+impl<E> Error for Err<E>
+where
+  E: fmt::Debug,
+{
+  fn source(&self) -> Option<&(dyn Error + 'static)> {
+    None // no underlying error
+  }
+}
+
+/// All nom parsers implement this trait
+pub trait Parser<I, O, E> {
+  /// A parser takes in input type, and returns a `Result` containing
+  /// either the remaining input and the output value, or an error
+  fn parse(&mut self, input: I) -> IResult<I, O, E>;
+
+  /// Maps a function over the result of a parser
+  fn map<G, O2>(self, g: G) -> Map<Self, G, O>
+  where
+    G: Fn(O) -> O2,
+    Self: core::marker::Sized,
+  {
+    Map {
+      f: self,
+      g,
+      phantom: core::marker::PhantomData,
+    }
+  }
+
+  /// Creates a second parser from the output of the first one, then apply over the rest of the input
+  fn flat_map<G, H, O2>(self, g: G) -> FlatMap<Self, G, O>
+  where
+    G: FnMut(O) -> H,
+    H: Parser<I, O2, E>,
+    Self: core::marker::Sized,
+  {
+    FlatMap {
+      f: self,
+      g,
+      phantom: core::marker::PhantomData,
+    }
+  }
+
+  /// Applies a second parser over the output of the first one
+  fn and_then<G, O2>(self, g: G) -> AndThen<Self, G, O>
+  where
+    G: Parser<O, O2, E>,
+    Self: core::marker::Sized,
+  {
+    AndThen {
+      f: self,
+      g,
+      phantom: core::marker::PhantomData,
+    }
+  }
+
+  /// Applies a second parser after the first one, return their results as a tuple
+  fn and<G, O2>(self, g: G) -> And<Self, G>
+  where
+    G: Parser<I, O2, E>,
+    Self: core::marker::Sized,
+  {
+    And { f: self, g }
+  }
+
+  /// Applies a second parser over the input if the first one failed
+  fn or<G>(self, g: G) -> Or<Self, G>
+  where
+    G: Parser<I, O, E>,
+    Self: core::marker::Sized,
+  {
+    Or { f: self, g }
+  }
+
+  /// automatically converts the parser's output and error values to another type, as long as they
+  /// implement the `From` trait
+  fn into<O2: From<O>, E2: From<E>>(self) -> Into<Self, O, O2, E, E2>
+  where
+    Self: core::marker::Sized,
+  {
+    Into {
+      f: self,
+      phantom_out1: core::marker::PhantomData,
+      phantom_err1: core::marker::PhantomData,
+      phantom_out2: core::marker::PhantomData,
+      phantom_err2: core::marker::PhantomData,
+    }
+  }
+}
+
+impl<'a, I, O, E, F> Parser<I, O, E> for F
+where
+  F: FnMut(I) -> IResult<I, O, E> + 'a,
+{
+  fn parse(&mut self, i: I) -> IResult<I, O, E> {
+    self(i)
+  }
+}
+
+#[cfg(feature = "alloc")]
+use alloc::boxed::Box;
+
+#[cfg(feature = "alloc")]
+impl<'a, I, O, E> Parser<I, O, E> for Box<dyn Parser<I, O, E> + 'a> {
+  fn parse(&mut self, input: I) -> IResult<I, O, E> {
+    (**self).parse(input)
+  }
+}
+
+/// Implementation of `Parser::map`
+#[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))]
+pub struct Map<F, G, O1> {
+  f: F,
+  g: G,
+  phantom: core::marker::PhantomData<O1>,
+}
+
+impl<'a, I, O1, O2, E, F: Parser<I, O1, E>, G: Fn(O1) -> O2> Parser<I, O2, E> for Map<F, G, O1> {
+  fn parse(&mut self, i: I) -> IResult<I, O2, E> {
+    match self.f.parse(i) {
+      Err(e) => Err(e),
+      Ok((i, o)) => Ok((i, (self.g)(o))),
+    }
+  }
+}
+
+/// Implementation of `Parser::flat_map`
+#[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))]
+pub struct FlatMap<F, G, O1> {
+  f: F,
+  g: G,
+  phantom: core::marker::PhantomData<O1>,
+}
+
+impl<'a, I, O1, O2, E, F: Parser<I, O1, E>, G: Fn(O1) -> H, H: Parser<I, O2, E>> Parser<I, O2, E>
+  for FlatMap<F, G, O1>
+{
+  fn parse(&mut self, i: I) -> IResult<I, O2, E> {
+    let (i, o1) = self.f.parse(i)?;
+    (self.g)(o1).parse(i)
+  }
+}
+
+/// Implementation of `Parser::and_then`
+#[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))]
+pub struct AndThen<F, G, O1> {
+  f: F,
+  g: G,
+  phantom: core::marker::PhantomData<O1>,
+}
+
+impl<'a, I, O1, O2, E, F: Parser<I, O1, E>, G: Parser<O1, O2, E>> Parser<I, O2, E>
+  for AndThen<F, G, O1>
+{
+  fn parse(&mut self, i: I) -> IResult<I, O2, E> {
+    let (i, o1) = self.f.parse(i)?;
+    let (_, o2) = self.g.parse(o1)?;
+    Ok((i, o2))
+  }
+}
+
+/// Implementation of `Parser::and`
+#[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))]
+pub struct And<F, G> {
+  f: F,
+  g: G,
+}
+
+impl<'a, I, O1, O2, E, F: Parser<I, O1, E>, G: Parser<I, O2, E>> Parser<I, (O1, O2), E>
+  for And<F, G>
+{
+  fn parse(&mut self, i: I) -> IResult<I, (O1, O2), E> {
+    let (i, o1) = self.f.parse(i)?;
+    let (i, o2) = self.g.parse(i)?;
+    Ok((i, (o1, o2)))
+  }
+}
+
+/// Implementation of `Parser::or`
+#[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))]
+pub struct Or<F, G> {
+  f: F,
+  g: G,
+}
+
+impl<'a, I: Clone, O, E: crate::error::ParseError<I>, F: Parser<I, O, E>, G: Parser<I, O, E>>
+  Parser<I, O, E> for Or<F, G>
+{
+  fn parse(&mut self, i: I) -> IResult<I, O, E> {
+    match self.f.parse(i.clone()) {
+      Err(Err::Error(e1)) => match self.g.parse(i) {
+        Err(Err::Error(e2)) => Err(Err::Error(e1.or(e2))),
+        res => res,
+      },
+      res => res,
+    }
+  }
+}
+
+/// Implementation of `Parser::into`
+#[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))]
+pub struct Into<F, O1, O2: From<O1>, E1, E2: From<E1>> {
+  f: F,
+  phantom_out1: core::marker::PhantomData<O1>,
+  phantom_err1: core::marker::PhantomData<E1>,
+  phantom_out2: core::marker::PhantomData<O2>,
+  phantom_err2: core::marker::PhantomData<E2>,
+}
+
+impl<
+    'a,
+    I: Clone,
+    O1,
+    O2: From<O1>,
+    E1,
+    E2: crate::error::ParseError<I> + From<E1>,
+    F: Parser<I, O1, E1>,
+  > Parser<I, O2, E2> for Into<F, O1, O2, E1, E2>
+{
+  fn parse(&mut self, i: I) -> IResult<I, O2, E2> {
+    match self.f.parse(i) {
+      Ok((i, o)) => Ok((i, o.into())),
+      Err(Err::Error(e)) => Err(Err::Error(e.into())),
+      Err(Err::Failure(e)) => Err(Err::Failure(e.into())),
+      Err(Err::Incomplete(e)) => Err(Err::Incomplete(e)),
+    }
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+  use crate::error::ErrorKind;
+
+  #[doc(hidden)]
+  #[macro_export]
+  macro_rules! assert_size (
+    ($t:ty, $sz:expr) => (
+      assert_eq!(crate::lib::std::mem::size_of::<$t>(), $sz);
+    );
+  );
+
+  #[test]
+  #[cfg(target_pointer_width = "64")]
+  fn size_test() {
+    assert_size!(IResult<&[u8], &[u8], (&[u8], u32)>, 40);
+    assert_size!(IResult<&str, &str, u32>, 40);
+    assert_size!(Needed, 8);
+    assert_size!(Err<u32>, 16);
+    assert_size!(ErrorKind, 1);
+  }
+
+  #[test]
+  fn err_map_test() {
+    let e = Err::Error(1);
+    assert_eq!(e.map(|v| v + 1), Err::Error(2));
+  }
+}