RPM build fix (reverted CI changes which will need to be un-reverted or made conditional) and vendor Rust dependencies to make builds much faster in any CI system.
This commit is contained in:
Adam Ierymenko
416
zeroidc/vendor/syn/src/error.rs
vendored
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416
zeroidc/vendor/syn/src/error.rs
vendored
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@@ -0,0 +1,416 @@
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#[cfg(feature = "parsing")]
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use crate::buffer::Cursor;
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use crate::thread::ThreadBound;
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use proc_macro2::{
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Delimiter, Group, Ident, LexError, Literal, Punct, Spacing, Span, TokenStream, TokenTree,
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};
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#[cfg(feature = "printing")]
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use quote::ToTokens;
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use std::fmt::{self, Debug, Display};
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use std::iter::FromIterator;
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use std::slice;
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use std::vec;
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/// The result of a Syn parser.
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pub type Result<T> = std::result::Result<T, Error>;
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/// Error returned when a Syn parser cannot parse the input tokens.
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///
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/// # Error reporting in proc macros
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///
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/// The correct way to report errors back to the compiler from a procedural
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/// macro is by emitting an appropriately spanned invocation of
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/// [`compile_error!`] in the generated code. This produces a better diagnostic
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/// message than simply panicking the macro.
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///
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/// [`compile_error!`]: std::compile_error!
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///
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/// When parsing macro input, the [`parse_macro_input!`] macro handles the
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/// conversion to `compile_error!` automatically.
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///
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/// [`parse_macro_input!`]: crate::parse_macro_input!
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///
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/// ```
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/// # extern crate proc_macro;
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/// #
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/// use proc_macro::TokenStream;
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/// use syn::{parse_macro_input, AttributeArgs, ItemFn};
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///
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/// # const IGNORE: &str = stringify! {
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/// #[proc_macro_attribute]
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/// # };
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/// pub fn my_attr(args: TokenStream, input: TokenStream) -> TokenStream {
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/// let args = parse_macro_input!(args as AttributeArgs);
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/// let input = parse_macro_input!(input as ItemFn);
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///
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/// /* ... */
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/// # TokenStream::new()
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/// }
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/// ```
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///
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/// For errors that arise later than the initial parsing stage, the
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/// [`.to_compile_error()`] or [`.into_compile_error()`] methods can be used to
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/// perform an explicit conversion to `compile_error!`.
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///
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/// [`.to_compile_error()`]: Error::to_compile_error
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/// [`.into_compile_error()`]: Error::into_compile_error
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///
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/// ```
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/// # extern crate proc_macro;
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/// #
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/// # use proc_macro::TokenStream;
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/// # use syn::{parse_macro_input, DeriveInput};
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/// #
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/// # const IGNORE: &str = stringify! {
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/// #[proc_macro_derive(MyDerive)]
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/// # };
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/// pub fn my_derive(input: TokenStream) -> TokenStream {
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/// let input = parse_macro_input!(input as DeriveInput);
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///
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/// // fn(DeriveInput) -> syn::Result<proc_macro2::TokenStream>
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/// expand::my_derive(input)
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/// .unwrap_or_else(syn::Error::into_compile_error)
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/// .into()
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/// }
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/// #
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/// # mod expand {
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/// # use proc_macro2::TokenStream;
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/// # use syn::{DeriveInput, Result};
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/// #
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/// # pub fn my_derive(input: DeriveInput) -> Result<TokenStream> {
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/// # unimplemented!()
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/// # }
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/// # }
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/// ```
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pub struct Error {
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messages: Vec<ErrorMessage>,
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}
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struct ErrorMessage {
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// Span is implemented as an index into a thread-local interner to keep the
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// size small. It is not safe to access from a different thread. We want
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// errors to be Send and Sync to play nicely with the Failure crate, so pin
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// the span we're given to its original thread and assume it is
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// Span::call_site if accessed from any other thread.
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start_span: ThreadBound<Span>,
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end_span: ThreadBound<Span>,
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message: String,
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}
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#[cfg(test)]
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struct _Test
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where
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Error: Send + Sync;
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impl Error {
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/// Usually the [`ParseStream::error`] method will be used instead, which
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/// automatically uses the correct span from the current position of the
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/// parse stream.
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///
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/// Use `Error::new` when the error needs to be triggered on some span other
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/// than where the parse stream is currently positioned.
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///
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/// [`ParseStream::error`]: crate::parse::ParseBuffer::error
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///
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/// # Example
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///
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/// ```
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/// use syn::{Error, Ident, LitStr, Result, Token};
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/// use syn::parse::ParseStream;
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///
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/// // Parses input that looks like `name = "string"` where the key must be
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/// // the identifier `name` and the value may be any string literal.
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/// // Returns the string literal.
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/// fn parse_name(input: ParseStream) -> Result<LitStr> {
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/// let name_token: Ident = input.parse()?;
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/// if name_token != "name" {
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/// // Trigger an error not on the current position of the stream,
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/// // but on the position of the unexpected identifier.
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/// return Err(Error::new(name_token.span(), "expected `name`"));
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/// }
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/// input.parse::<Token![=]>()?;
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/// let s: LitStr = input.parse()?;
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/// Ok(s)
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/// }
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/// ```
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pub fn new<T: Display>(span: Span, message: T) -> Self {
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Error {
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messages: vec![ErrorMessage {
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start_span: ThreadBound::new(span),
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end_span: ThreadBound::new(span),
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message: message.to_string(),
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}],
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}
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}
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/// Creates an error with the specified message spanning the given syntax
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/// tree node.
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///
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/// Unlike the `Error::new` constructor, this constructor takes an argument
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/// `tokens` which is a syntax tree node. This allows the resulting `Error`
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/// to attempt to span all tokens inside of `tokens`. While you would
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/// typically be able to use the `Spanned` trait with the above `Error::new`
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/// constructor, implementation limitations today mean that
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/// `Error::new_spanned` may provide a higher-quality error message on
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/// stable Rust.
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///
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/// When in doubt it's recommended to stick to `Error::new` (or
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/// `ParseStream::error`)!
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#[cfg(feature = "printing")]
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pub fn new_spanned<T: ToTokens, U: Display>(tokens: T, message: U) -> Self {
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let mut iter = tokens.into_token_stream().into_iter();
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let start = iter.next().map_or_else(Span::call_site, |t| t.span());
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let end = iter.last().map_or(start, |t| t.span());
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Error {
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messages: vec![ErrorMessage {
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start_span: ThreadBound::new(start),
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end_span: ThreadBound::new(end),
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message: message.to_string(),
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}],
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}
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}
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/// The source location of the error.
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///
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/// Spans are not thread-safe so this function returns `Span::call_site()`
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/// if called from a different thread than the one on which the `Error` was
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/// originally created.
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pub fn span(&self) -> Span {
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let start = match self.messages[0].start_span.get() {
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Some(span) => *span,
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None => return Span::call_site(),
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};
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let end = match self.messages[0].end_span.get() {
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Some(span) => *span,
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None => return Span::call_site(),
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};
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start.join(end).unwrap_or(start)
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}
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/// Render the error as an invocation of [`compile_error!`].
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///
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/// The [`parse_macro_input!`] macro provides a convenient way to invoke
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/// this method correctly in a procedural macro.
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///
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/// [`compile_error!`]: std::compile_error!
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/// [`parse_macro_input!`]: crate::parse_macro_input!
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pub fn to_compile_error(&self) -> TokenStream {
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self.messages
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.iter()
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.map(ErrorMessage::to_compile_error)
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.collect()
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}
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/// Render the error as an invocation of [`compile_error!`].
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///
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/// [`compile_error!`]: std::compile_error!
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///
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/// # Example
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///
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/// ```
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/// # extern crate proc_macro;
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/// #
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/// use proc_macro::TokenStream;
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/// use syn::{parse_macro_input, DeriveInput, Error};
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///
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/// # const _: &str = stringify! {
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/// #[proc_macro_derive(MyTrait)]
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/// # };
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/// pub fn derive_my_trait(input: TokenStream) -> TokenStream {
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/// let input = parse_macro_input!(input as DeriveInput);
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/// my_trait::expand(input)
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/// .unwrap_or_else(Error::into_compile_error)
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/// .into()
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/// }
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///
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/// mod my_trait {
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/// use proc_macro2::TokenStream;
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/// use syn::{DeriveInput, Result};
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///
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/// pub(crate) fn expand(input: DeriveInput) -> Result<TokenStream> {
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/// /* ... */
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/// # unimplemented!()
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/// }
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/// }
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/// ```
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pub fn into_compile_error(self) -> TokenStream {
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self.to_compile_error()
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}
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/// Add another error message to self such that when `to_compile_error()` is
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/// called, both errors will be emitted together.
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pub fn combine(&mut self, another: Error) {
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self.messages.extend(another.messages);
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}
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}
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impl ErrorMessage {
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fn to_compile_error(&self) -> TokenStream {
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let start = self
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.start_span
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.get()
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.cloned()
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.unwrap_or_else(Span::call_site);
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let end = self.end_span.get().cloned().unwrap_or_else(Span::call_site);
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// compile_error!($message)
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TokenStream::from_iter(vec![
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TokenTree::Ident(Ident::new("compile_error", start)),
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TokenTree::Punct({
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let mut punct = Punct::new('!', Spacing::Alone);
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punct.set_span(start);
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punct
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}),
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TokenTree::Group({
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let mut group = Group::new(Delimiter::Brace, {
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TokenStream::from_iter(vec![TokenTree::Literal({
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let mut string = Literal::string(&self.message);
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string.set_span(end);
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string
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})])
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});
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group.set_span(end);
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group
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}),
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])
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}
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}
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#[cfg(feature = "parsing")]
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pub fn new_at<T: Display>(scope: Span, cursor: Cursor, message: T) -> Error {
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if cursor.eof() {
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Error::new(scope, format!("unexpected end of input, {}", message))
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} else {
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let span = crate::buffer::open_span_of_group(cursor);
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Error::new(span, message)
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}
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}
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#[cfg(all(feature = "parsing", any(feature = "full", feature = "derive")))]
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pub fn new2<T: Display>(start: Span, end: Span, message: T) -> Error {
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Error {
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messages: vec![ErrorMessage {
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start_span: ThreadBound::new(start),
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end_span: ThreadBound::new(end),
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message: message.to_string(),
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}],
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}
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}
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impl Debug for Error {
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fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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if self.messages.len() == 1 {
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formatter
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.debug_tuple("Error")
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.field(&self.messages[0])
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.finish()
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} else {
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formatter
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.debug_tuple("Error")
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.field(&self.messages)
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.finish()
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}
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}
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}
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impl Debug for ErrorMessage {
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fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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Debug::fmt(&self.message, formatter)
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}
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}
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impl Display for Error {
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fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str(&self.messages[0].message)
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}
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}
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impl Clone for Error {
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fn clone(&self) -> Self {
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Error {
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messages: self.messages.clone(),
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}
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}
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}
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impl Clone for ErrorMessage {
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fn clone(&self) -> Self {
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let start = self
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.start_span
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.get()
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.cloned()
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.unwrap_or_else(Span::call_site);
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let end = self.end_span.get().cloned().unwrap_or_else(Span::call_site);
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ErrorMessage {
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start_span: ThreadBound::new(start),
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end_span: ThreadBound::new(end),
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message: self.message.clone(),
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}
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}
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}
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impl std::error::Error for Error {}
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impl From<LexError> for Error {
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fn from(err: LexError) -> Self {
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Error::new(err.span(), "lex error")
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}
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}
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impl IntoIterator for Error {
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type Item = Error;
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type IntoIter = IntoIter;
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fn into_iter(self) -> Self::IntoIter {
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IntoIter {
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messages: self.messages.into_iter(),
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}
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}
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}
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pub struct IntoIter {
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messages: vec::IntoIter<ErrorMessage>,
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}
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impl Iterator for IntoIter {
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type Item = Error;
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fn next(&mut self) -> Option<Self::Item> {
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Some(Error {
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messages: vec![self.messages.next()?],
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})
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}
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}
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impl<'a> IntoIterator for &'a Error {
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type Item = Error;
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type IntoIter = Iter<'a>;
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fn into_iter(self) -> Self::IntoIter {
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Iter {
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messages: self.messages.iter(),
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}
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}
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}
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pub struct Iter<'a> {
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messages: slice::Iter<'a, ErrorMessage>,
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}
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impl<'a> Iterator for Iter<'a> {
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type Item = Error;
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fn next(&mut self) -> Option<Self::Item> {
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Some(Error {
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messages: vec![self.messages.next()?.clone()],
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})
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}
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}
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impl Extend<Error> for Error {
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fn extend<T: IntoIterator<Item = Error>>(&mut self, iter: T) {
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for err in iter {
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self.combine(err);
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}
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}
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}
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Block a user