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-rw-r--r--vendor/syn/src/ext.rs135
1 files changed, 0 insertions, 135 deletions
diff --git a/vendor/syn/src/ext.rs b/vendor/syn/src/ext.rs
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--- a/vendor/syn/src/ext.rs
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-//! Extension traits to provide parsing methods on foreign types.
-
-use crate::buffer::Cursor;
-use crate::parse::Peek;
-use crate::parse::{ParseStream, Result};
-use crate::sealed::lookahead;
-use crate::token::CustomToken;
-use proc_macro2::Ident;
-
-/// Additional methods for `Ident` not provided by proc-macro2 or libproc_macro.
-///
-/// This trait is sealed and cannot be implemented for types outside of Syn. It
-/// is implemented only for `proc_macro2::Ident`.
-pub trait IdentExt: Sized + private::Sealed {
- /// Parses any identifier including keywords.
- ///
- /// This is useful when parsing macro input which allows Rust keywords as
- /// identifiers.
- ///
- /// # Example
- ///
- /// ```
- /// use syn::{Error, Ident, Result, Token};
- /// use syn::ext::IdentExt;
- /// use syn::parse::ParseStream;
- ///
- /// mod kw {
- /// syn::custom_keyword!(name);
- /// }
- ///
- /// // Parses input that looks like `name = NAME` where `NAME` can be
- /// // any identifier.
- /// //
- /// // Examples:
- /// //
- /// // name = anything
- /// // name = impl
- /// fn parse_dsl(input: ParseStream) -> Result<Ident> {
- /// input.parse::<kw::name>()?;
- /// input.parse::<Token![=]>()?;
- /// let name = input.call(Ident::parse_any)?;
- /// Ok(name)
- /// }
- /// ```
- fn parse_any(input: ParseStream) -> Result<Self>;
-
- /// Peeks any identifier including keywords. Usage:
- /// `input.peek(Ident::peek_any)`
- ///
- /// This is different from `input.peek(Ident)` which only returns true in
- /// the case of an ident which is not a Rust keyword.
- #[allow(non_upper_case_globals)]
- const peek_any: private::PeekFn = private::PeekFn;
-
- /// Strips the raw marker `r#`, if any, from the beginning of an ident.
- ///
- /// - unraw(`x`) = `x`
- /// - unraw(`move`) = `move`
- /// - unraw(`r#move`) = `move`
- ///
- /// # Example
- ///
- /// In the case of interop with other languages like Python that have a
- /// different set of keywords than Rust, we might come across macro input
- /// that involves raw identifiers to refer to ordinary variables in the
- /// other language with a name that happens to be a Rust keyword.
- ///
- /// The function below appends an identifier from the caller's input onto a
- /// fixed prefix. Without using `unraw()`, this would tend to produce
- /// invalid identifiers like `__pyo3_get_r#move`.
- ///
- /// ```
- /// use proc_macro2::Span;
- /// use syn::Ident;
- /// use syn::ext::IdentExt;
- ///
- /// fn ident_for_getter(variable: &Ident) -> Ident {
- /// let getter = format!("__pyo3_get_{}", variable.unraw());
- /// Ident::new(&getter, Span::call_site())
- /// }
- /// ```
- fn unraw(&self) -> Ident;
-}
-
-impl IdentExt for Ident {
- fn parse_any(input: ParseStream) -> Result<Self> {
- input.step(|cursor| match cursor.ident() {
- Some((ident, rest)) => Ok((ident, rest)),
- None => Err(cursor.error("expected ident")),
- })
- }
-
- fn unraw(&self) -> Ident {
- let string = self.to_string();
- if let Some(string) = string.strip_prefix("r#") {
- Ident::new(string, self.span())
- } else {
- self.clone()
- }
- }
-}
-
-impl Peek for private::PeekFn {
- type Token = private::IdentAny;
-}
-
-impl CustomToken for private::IdentAny {
- fn peek(cursor: Cursor) -> bool {
- cursor.ident().is_some()
- }
-
- fn display() -> &'static str {
- "identifier"
- }
-}
-
-impl lookahead::Sealed for private::PeekFn {}
-
-mod private {
- use proc_macro2::Ident;
-
- pub trait Sealed {}
-
- impl Sealed for Ident {}
-
- pub struct PeekFn;
- pub struct IdentAny;
-
- impl Copy for PeekFn {}
- impl Clone for PeekFn {
- fn clone(&self) -> Self {
- *self
- }
- }
-}