Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

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

1 files changed, 591 insertions, 0 deletions

diff --git a/vendor/proc-macro-hack/src/lib.rs b/vendor/proc-macro-hack/src/lib.rs
new file mode 100644
index 000000000..90b04fd5f
--- /dev/null
+++ b/vendor/proc-macro-hack/src/lib.rs
@@ -0,0 +1,591 @@
+//! [![github]](https://github.com/dtolnay/proc-macro-hack) [![crates-io]](https://crates.io/crates/proc-macro-hack) [![docs-rs]](https://docs.rs/proc-macro-hack)
+//!
+//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github
+//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust
+//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logoColor=white&logo=data:image/svg+xml;base64,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
+//!
+//! <br>
+//!
+//! <table><tr><td><hr>
+//! <b>Note:</b> <i>As of Rust 1.45 this crate is superseded by native support
+//! for #[proc_macro] in expression position. Only consider using this crate if
+//! you care about supporting compilers between 1.31 and 1.45.</i>
+//! <hr></td></tr></table>
+//!
+//! Since Rust 1.30, the language supports user-defined function-like procedural
+//! macros. However these can only be invoked in item position, not in
+//! statements or expressions.
+//!
+//! This crate implements an alternative type of procedural macro that can be
+//! invoked in statement or expression position.
+//!
+//! # Defining procedural macros
+//!
+//! Two crates are required to define a procedural macro.
+//!
+//! ## The implementation crate
+//!
+//! This crate must contain nothing but procedural macros. Private helper
+//! functions and private modules are fine but nothing can be public.
+//!
+//! [&raquo; example of an implementation crate][demo-hack-impl]
+//!
+//! Just like you would use a #\[proc_macro\] attribute to define a natively
+//! supported procedural macro, use proc-macro-hack's #\[proc_macro_hack\]
+//! attribute to define a procedural macro that works in expression position.
+//! The function signature is the same as for ordinary function-like procedural
+//! macros.
+//!
+//! ```
+//! # extern crate proc_macro;
+//! #
+//! use proc_macro::TokenStream;
+//! use proc_macro_hack::proc_macro_hack;
+//! use quote::quote;
+//! use syn::{parse_macro_input, Expr};
+//!
+//! # const IGNORE: &str = stringify! {
+//! #[proc_macro_hack]
+//! # };
+//! pub fn add_one(input: TokenStream) -> TokenStream {
+//!     let expr = parse_macro_input!(input as Expr);
+//!     TokenStream::from(quote! {
+//!         1 + (#expr)
+//!     })
+//! }
+//! #
+//! # fn main() {}
+//! ```
+//!
+//! ## The declaration crate
+//!
+//! This crate is allowed to contain other public things if you need, for
+//! example traits or functions or ordinary macros.
+//!
+//! [&raquo; example of a declaration crate][demo-hack]
+//!
+//! Within the declaration crate there needs to be a re-export of your
+//! procedural macro from the implementation crate. The re-export also carries a
+//! \#\[proc_macro_hack\] attribute.
+//!
+//! ```
+//! use proc_macro_hack::proc_macro_hack;
+//!
+//! /// Add one to an expression.
+//! ///
+//! /// (Documentation goes here on the re-export, not in the other crate.)
+//! #[proc_macro_hack]
+//! pub use demo_hack_impl::add_one;
+//! #
+//! # fn main() {}
+//! ```
+//!
+//! Both crates depend on `proc-macro-hack`:
+//!
+//! ```toml
+//! [dependencies]
+//! proc-macro-hack = "0.5"
+//! ```
+//!
+//! Additionally, your implementation crate (but not your declaration crate) is
+//! a proc macro crate:
+//!
+//! ```toml
+//! [lib]
+//! proc-macro = true
+//! ```
+//!
+//! # Using procedural macros
+//!
+//! Users of your crate depend on your declaration crate (not your
+//! implementation crate), then use your procedural macros as usual.
+//!
+//! [&raquo; example of a downstream crate][example]
+//!
+//! ```
+//! use demo_hack::add_one;
+//!
+//! fn main() {
+//!     let two = 2;
+//!     let nine = add_one!(two) + add_one!(2 + 3);
+//!     println!("nine = {}", nine);
+//! }
+//! ```
+//!
+//! [demo-hack-impl]: https://github.com/dtolnay/proc-macro-hack/tree/master/demo-hack-impl
+//! [demo-hack]: https://github.com/dtolnay/proc-macro-hack/tree/master/demo-hack
+//! [example]: https://github.com/dtolnay/proc-macro-hack/tree/master/example
+//!
+//! # Limitations
+//!
+//! - Only proc macros in expression position are supported. Proc macros in
+//!   pattern position ([#20]) are not supported.
+//!
+//! - By default, nested invocations are not supported i.e. the code emitted by
+//!   a proc-macro-hack macro invocation cannot contain recursive calls to the
+//!   same proc-macro-hack macro nor calls to any other proc-macro-hack macros.
+//!   Use [`proc-macro-nested`] if you require support for nested invocations.
+//!
+//! - By default, hygiene is structured such that the expanded code can't refer
+//!   to local variables other than those passed by name somewhere in the macro
+//!   input. If your macro must refer to *local* variables that don't get named
+//!   in the macro input, use `#[proc_macro_hack(fake_call_site)]` on the
+//!   re-export in your declaration crate. *Most macros won't need this.*
+//!
+//! - On compilers that are new enough to natively support proc macros in
+//!   expression position, proc-macro-hack does not automatically use that
+//!   support, since the hygiene can be subtly different between the two
+//!   implementations. To opt in to compiling your macro to native
+//!   `#[proc_macro]` on sufficiently new compilers, use
+//!   `#[proc_macro_hack(only_hack_old_rustc)]` on the re-export in your
+//!   declaration crate.
+//!
+//! [#10]: https://github.com/dtolnay/proc-macro-hack/issues/10
+//! [#20]: https://github.com/dtolnay/proc-macro-hack/issues/20
+//! [`proc-macro-nested`]: https://docs.rs/proc-macro-nested
+
+#![recursion_limit = "512"]
+#![allow(clippy::needless_doctest_main, clippy::toplevel_ref_arg)]
+
+extern crate proc_macro;
+
+#[macro_use]
+mod quote;
+
+mod error;
+mod iter;
+mod parse;
+
+use crate::error::{compile_error, Error};
+use crate::iter::Iter;
+use crate::parse::{
+    parse_define_args, parse_enum_hack, parse_export_args, parse_fake_call_site, parse_input,
+};
+use proc_macro::{Ident, Punct, Spacing, Span, TokenStream, TokenTree};
+use std::fmt::Write;
+
+type Visibility = Option<Ident>;
+
+enum Input {
+    Export(Export),
+    Define(Define),
+}
+
+// pub use demo_hack_impl::{m1, m2 as qrst};
+struct Export {
+    attrs: TokenStream,
+    vis: Visibility,
+    from: Ident,
+    macros: Vec<Macro>,
+}
+
+// pub fn m1(input: TokenStream) -> TokenStream { ... }
+struct Define {
+    attrs: TokenStream,
+    name: Ident,
+    body: TokenStream,
+}
+
+struct Macro {
+    name: Ident,
+    export_as: Ident,
+}
+
+#[proc_macro_attribute]
+pub fn proc_macro_hack(args: TokenStream, input: TokenStream) -> TokenStream {
+    let ref mut args = iter::new(args);
+    let ref mut input = iter::new(input);
+    expand_proc_macro_hack(args, input).unwrap_or_else(compile_error)
+}
+
+fn expand_proc_macro_hack(args: Iter, input: Iter) -> Result<TokenStream, Error> {
+    match parse_input(input)? {
+        Input::Export(export) => {
+            let args = parse_export_args(args)?;
+            Ok(expand_export(export, args))
+        }
+        Input::Define(define) => {
+            parse_define_args(args)?;
+            Ok(expand_define(define))
+        }
+    }
+}
+
+#[doc(hidden)]
+#[proc_macro_derive(ProcMacroHack)]
+pub fn enum_hack(input: TokenStream) -> TokenStream {
+    let ref mut input = iter::new(input);
+    parse_enum_hack(input).unwrap_or_else(compile_error)
+}
+
+struct FakeCallSite {
+    derive: Ident,
+    rest: TokenStream,
+}
+
+#[doc(hidden)]
+#[proc_macro_attribute]
+pub fn fake_call_site(args: TokenStream, input: TokenStream) -> TokenStream {
+    let ref mut args = iter::new(args);
+    let ref mut input = iter::new(input);
+    expand_fake_call_site(args, input).unwrap_or_else(compile_error)
+}
+
+fn expand_fake_call_site(args: Iter, input: Iter) -> Result<TokenStream, Error> {
+    let span = match args.next() {
+        Some(token) => token.span(),
+        None => return Ok(input.collect()),
+    };
+
+    let input = parse_fake_call_site(input)?;
+    let mut derive = input.derive;
+    derive.set_span(span);
+    let rest = input.rest;
+
+    Ok(quote! {
+        #[derive(#derive)]
+        #rest
+    })
+}
+
+struct ExportArgs {
+    support_nested: bool,
+    internal_macro_calls: u16,
+    fake_call_site: bool,
+    only_hack_old_rustc: bool,
+}
+
+fn expand_export(export: Export, args: ExportArgs) -> TokenStream {
+    if args.only_hack_old_rustc && cfg!(not(need_proc_macro_hack)) {
+        return expand_export_nohack(export);
+    }
+
+    let dummy = dummy_name_for_export(&export);
+
+    let attrs = export.attrs;
+    let vis = export.vis;
+    let macro_export = match vis {
+        Some(_) => quote!(#[macro_export]),
+        None => quote!(),
+    };
+    let crate_prefix = vis.as_ref().map(|_| quote!($crate::));
+    let enum_variant = if args.support_nested {
+        if args.internal_macro_calls == 0 {
+            Ident::new("Nested", Span::call_site())
+        } else {
+            let name = format!("Nested{}", args.internal_macro_calls);
+            Ident::new(&name, Span::call_site())
+        }
+    } else {
+        Ident::new("Value", Span::call_site())
+    };
+
+    let from = export.from;
+    let mut actual_names = TokenStream::new();
+    let mut export_dispatch = TokenStream::new();
+    let mut export_call_site = TokenStream::new();
+    let mut macro_rules = TokenStream::new();
+    for Macro { name, export_as } in &export.macros {
+        let hacked = hacked_proc_macro_name(&name);
+        let dispatch = dispatch_macro_name(&name);
+        let call_site = call_site_macro_name(&name);
+
+        if !actual_names.is_empty() {
+            actual_names.extend(quote!(,));
+        }
+        actual_names.extend(quote!(#hacked));
+
+        if !export_dispatch.is_empty() {
+            export_dispatch.extend(quote!(,));
+        }
+        export_dispatch.extend(quote!(dispatch as #dispatch));
+
+        if !export_call_site.is_empty() {
+            export_call_site.extend(quote!(,));
+        }
+        export_call_site.extend(quote!(fake_call_site as #call_site));
+
+        let do_derive = if !args.fake_call_site {
+            quote! {
+                #[derive(#crate_prefix #hacked)]
+            }
+        } else if crate_prefix.is_some() {
+            quote! {
+                use #crate_prefix #hacked;
+                #[#crate_prefix #call_site ($($proc_macro)*)]
+                #[derive(#hacked)]
+            }
+        } else {
+            quote! {
+                #[#call_site ($($proc_macro)*)]
+                #[derive(#hacked)]
+            }
+        };
+
+        let proc_macro_call = if args.support_nested {
+            let extra_bangs = (0..args.internal_macro_calls)
+                .map(|_| TokenTree::Punct(Punct::new('!', Spacing::Alone)))
+                .collect::<TokenStream>();
+            quote! {
+                #crate_prefix #dispatch! { ($($proc_macro)*) #extra_bangs }
+            }
+        } else {
+            quote! {
+                proc_macro_call!()
+            }
+        };
+
+        macro_rules.extend(quote! {
+            #attrs
+            #macro_export
+            macro_rules! #export_as {
+                ($($proc_macro:tt)*) => {{
+                    #do_derive
+                    #[allow(dead_code)]
+                    enum ProcMacroHack {
+                        #enum_variant = (stringify! { $($proc_macro)* }, 0).1,
+                    }
+                    #proc_macro_call
+                }};
+            }
+        });
+    }
+
+    if export.macros.len() != 1 {
+        export_dispatch = quote!({#export_dispatch});
+        export_call_site = quote!({#export_call_site});
+        actual_names = quote!({#actual_names});
+    }
+
+    let export_dispatch = if args.support_nested {
+        quote! {
+            #[doc(hidden)]
+            #vis use proc_macro_nested::#export_dispatch;
+        }
+    } else {
+        quote!()
+    };
+
+    let export_call_site = if args.fake_call_site {
+        quote! {
+            #[doc(hidden)]
+            #vis use proc_macro_hack::#export_call_site;
+        }
+    } else {
+        quote!()
+    };
+
+    let expanded = quote! {
+        #[doc(hidden)]
+        #vis use #from::#actual_names;
+
+        #export_dispatch
+        #export_call_site
+
+        #macro_rules
+    };
+
+    wrap_in_enum_hack(dummy, expanded)
+}
+
+fn expand_export_nohack(export: Export) -> TokenStream {
+    let attrs = export.attrs;
+    let vis = export.vis;
+    let from = export.from;
+    let mut names = TokenStream::new();
+
+    for Macro { name, export_as } in &export.macros {
+        let pub_name = pub_proc_macro_name(&name);
+        if !names.is_empty() {
+            names.extend(quote!(,));
+        }
+        names.extend(quote!(#pub_name as #export_as));
+    }
+
+    if export.macros.len() != 1 {
+        names = quote!({#names});
+    }
+
+    quote! {
+        #attrs
+        #vis use #from::#names;
+    }
+}
+
+fn expand_define(define: Define) -> TokenStream {
+    let attrs = define.attrs;
+    let name = define.name;
+    let pub_name = pub_proc_macro_name(&name);
+    let hacked = hacked_proc_macro_name(&name);
+    let body = define.body;
+
+    quote! {
+        mod #pub_name {
+            extern crate proc_macro;
+            pub use self::proc_macro::*;
+        }
+
+        #attrs
+        #[doc(hidden)]
+        #[proc_macro_derive(#hacked)]
+        pub fn #hacked(input: #pub_name::TokenStream) -> #pub_name::TokenStream {
+            use std::iter::FromIterator;
+
+            let mut iter = input.into_iter();
+            iter.next().unwrap(); // `enum`
+            iter.next().unwrap(); // `ProcMacroHack`
+            iter.next().unwrap(); // `#`
+            iter.next().unwrap(); // `[allow(dead_code)]`
+
+            let mut braces = match iter.next().unwrap() {
+                #pub_name::TokenTree::Group(group) => group.stream().into_iter(),
+                _ => unimplemented!(),
+            };
+            let variant = braces.next().unwrap(); // `Value` or `Nested`
+            let varname = variant.to_string();
+            let support_nested = varname.starts_with("Nested");
+            braces.next().unwrap(); // `=`
+
+            let mut parens = match braces.next().unwrap() {
+                #pub_name::TokenTree::Group(group) => group.stream().into_iter(),
+                _ => unimplemented!(),
+            };
+            parens.next().unwrap(); // `stringify`
+            parens.next().unwrap(); // `!`
+
+            let inner = match parens.next().unwrap() {
+                #pub_name::TokenTree::Group(group) => group.stream(),
+                _ => unimplemented!(),
+            };
+
+            let output: #pub_name::TokenStream = #name(inner.clone());
+
+            fn count_bangs(input: #pub_name::TokenStream) -> usize {
+                let mut count = 0;
+                for token in input {
+                    match token {
+                        #pub_name::TokenTree::Punct(punct) => {
+                            if punct.as_char() == '!' {
+                                count += 1;
+                            }
+                        }
+                        #pub_name::TokenTree::Group(group) => {
+                            count += count_bangs(group.stream());
+                        }
+                        _ => {}
+                    }
+                }
+                count
+            }
+
+            // macro_rules! proc_macro_call {
+            //     () => { #output }
+            // }
+            #pub_name::TokenStream::from_iter(vec![
+                #pub_name::TokenTree::Ident(
+                    #pub_name::Ident::new("macro_rules", #pub_name::Span::call_site()),
+                ),
+                #pub_name::TokenTree::Punct(
+                    #pub_name::Punct::new('!', #pub_name::Spacing::Alone),
+                ),
+                #pub_name::TokenTree::Ident(
+                    #pub_name::Ident::new(
+                        &if support_nested {
+                            let extra_bangs = if varname == "Nested" {
+                                0
+                            } else {
+                                varname["Nested".len()..].parse().unwrap()
+                            };
+                            format!("proc_macro_call_{}", extra_bangs + count_bangs(inner))
+                        } else {
+                            String::from("proc_macro_call")
+                        },
+                        #pub_name::Span::call_site(),
+                    ),
+                ),
+                #pub_name::TokenTree::Group(
+                    #pub_name::Group::new(#pub_name::Delimiter::Brace, #pub_name::TokenStream::from_iter(vec![
+                        #pub_name::TokenTree::Group(
+                            #pub_name::Group::new(#pub_name::Delimiter::Parenthesis, #pub_name::TokenStream::new()),
+                        ),
+                        #pub_name::TokenTree::Punct(
+                            #pub_name::Punct::new('=', #pub_name::Spacing::Joint),
+                        ),
+                        #pub_name::TokenTree::Punct(
+                            #pub_name::Punct::new('>', #pub_name::Spacing::Alone),
+                        ),
+                        #pub_name::TokenTree::Group(
+                            #pub_name::Group::new(#pub_name::Delimiter::Brace, output),
+                        ),
+                    ])),
+                ),
+            ])
+        }
+
+        #attrs
+        #[proc_macro]
+        pub fn #pub_name(input: #pub_name::TokenStream) -> #pub_name::TokenStream {
+            #name(input)
+        }
+
+        fn #name #body
+    }
+}
+
+fn pub_proc_macro_name(conceptual: &Ident) -> Ident {
+    Ident::new(
+        &format!("proc_macro_hack_{}", conceptual),
+        conceptual.span(),
+    )
+}
+
+fn hacked_proc_macro_name(conceptual: &Ident) -> Ident {
+    Ident::new(
+        &format!("_proc_macro_hack_{}", conceptual),
+        conceptual.span(),
+    )
+}
+
+fn dispatch_macro_name(conceptual: &Ident) -> Ident {
+    Ident::new(
+        &format!("proc_macro_call_{}", conceptual),
+        conceptual.span(),
+    )
+}
+
+fn call_site_macro_name(conceptual: &Ident) -> Ident {
+    Ident::new(
+        &format!("proc_macro_fake_call_site_{}", conceptual),
+        conceptual.span(),
+    )
+}
+
+fn dummy_name_for_export(export: &Export) -> String {
+    let mut dummy = String::new();
+    let from = unraw(&export.from).to_string();
+    write!(dummy, "_{}{}", from.len(), from).unwrap();
+    for m in &export.macros {
+        let name = unraw(&m.name).to_string();
+        write!(dummy, "_{}{}", name.len(), name).unwrap();
+    }
+    dummy
+}
+
+fn unraw(ident: &Ident) -> Ident {
+    let string = ident.to_string();
+    if string.starts_with("r#") {
+        Ident::new(&string[2..], ident.span())
+    } else {
+        ident.clone()
+    }
+}
+
+fn wrap_in_enum_hack(dummy: String, inner: TokenStream) -> TokenStream {
+    let dummy = Ident::new(&dummy, Span::call_site());
+    quote! {
+        #[derive(proc_macro_hack::ProcMacroHack)]
+        enum #dummy {
+            Value = (stringify! { #inner }, 0).1,
+        }
+    }
+}