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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2018"
rust-version = "1.31"
name = "proc-macro-hack"
version = "0.5.20+deprecated"
authors = ["David Tolnay <dtolnay@gmail.com>"]
description = "Procedural macros in expression position"
readme = "README.md"
categories = ["development-tools::procedural-macro-helpers"]
license = "MIT OR Apache-2.0"
repository = "https://github.com/dtolnay/proc-macro-hack"
[package.metadata.docs.rs]
targets = ["x86_64-unknown-linux-gnu"]
[lib]
proc-macro = true
[dev-dependencies.demo-hack]
version = "0.0.5"
[dev-dependencies.demo-hack-impl]
version = "0.0.5"
[dev-dependencies.quote]
version = "1.0"
[dev-dependencies.rustversion]
version = "1.0"
[dev-dependencies.syn]
version = "1.0.5"
[dev-dependencies.trybuild]
version = "1.0.49"
features = ["diff"]

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Copyright (c) 2018 David Tolnay
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Procedural macros in expression position
========================================
[<img alt="github" src="https://img.shields.io/badge/github-dtolnay/proc--macro--hack-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/proc-macro-hack)
[<img alt="crates.io" src="https://img.shields.io/crates/v/proc-macro-hack.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/proc-macro-hack)
[<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-proc--macro--hack-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" height="20">](https://docs.rs/proc-macro-hack)
[<img alt="build status" src="https://img.shields.io/github/actions/workflow/status/dtolnay/proc-macro-hack/ci.yml?branch=master&style=for-the-badge" height="20">](https://github.com/dtolnay/proc-macro-hack/actions?query=branch%3Amaster)
<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As of Rust 1.45 this crate is superseded by native support for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.
This approach works with any Rust version 1.31+.
## 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.
```rust
use proc_macro::TokenStream;
use proc_macro_hack::proc_macro_hack;
use quote::quote;
use syn::{parse_macro_input, Expr};
#[proc_macro_hack]
pub fn add_one(input: TokenStream) -> TokenStream {
let expr = parse_macro_input!(input as Expr);
TokenStream::from(quote! {
1 + (#expr)
})
}
```
### 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.
```rust
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;
```
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]
```rust
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
<br>
#### License
<sup>
Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
</sup>
<br>
<sub>
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this hack by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.
</sub>

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use std::env;
use std::process::Command;
use std::str;
// The rustc-cfg strings below are *not* public API. Please let us know by
// opening a GitHub issue if your build environment requires some way to enable
// these cfgs other than by executing our build script.
fn main() {
let minor = match rustc_minor_version() {
Some(minor) => minor,
None => return,
};
// Function-like procedural macros in expressions, patterns, and statements
// stabilized in Rust 1.45:
// https://blog.rust-lang.org/2020/07/16/Rust-1.45.0.html#stabilizing-function-like-procedural-macros-in-expressions-patterns-and-statements
if minor < 45 {
println!("cargo:rustc-cfg=need_proc_macro_hack");
}
}
fn rustc_minor_version() -> Option<u32> {
let rustc = env::var_os("RUSTC")?;
let output = Command::new(rustc).arg("--version").output().ok()?;
let version = str::from_utf8(&output.stdout).ok()?;
let mut pieces = version.split('.');
if pieces.next() != Some("rustc 1") {
return None;
}
pieces.next()?.parse().ok()
}

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use proc_macro::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
use std::iter::FromIterator;
pub struct Error {
span: Span,
msg: String,
}
impl Error {
pub fn new(span: Span, msg: impl Into<String>) -> Self {
Error {
span,
msg: msg.into(),
}
}
}
pub fn compile_error(err: Error) -> TokenStream {
// compile_error!($msg)
TokenStream::from_iter(vec![
TokenTree::Ident(Ident::new("compile_error", err.span)),
TokenTree::Punct({
let mut punct = Punct::new('!', Spacing::Alone);
punct.set_span(err.span);
punct
}),
TokenTree::Group({
let mut group = Group::new(Delimiter::Brace, {
TokenStream::from_iter(vec![TokenTree::Literal({
let mut string = Literal::string(&err.msg);
string.set_span(err.span);
string
})])
});
group.set_span(err.span);
group
}),
])
}

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use proc_macro::{token_stream, Delimiter, TokenStream, TokenTree};
pub type Iter<'a> = &'a mut IterImpl;
pub struct IterImpl {
stack: Vec<token_stream::IntoIter>,
peeked: Option<TokenTree>,
}
pub fn new(tokens: TokenStream) -> IterImpl {
IterImpl {
stack: vec![tokens.into_iter()],
peeked: None,
}
}
impl IterImpl {
pub fn peek(&mut self) -> Option<&TokenTree> {
self.peeked = self.next();
self.peeked.as_ref()
}
}
impl Iterator for IterImpl {
type Item = TokenTree;
fn next(&mut self) -> Option<Self::Item> {
if let Some(tt) = self.peeked.take() {
return Some(tt);
}
loop {
let top = self.stack.last_mut()?;
match top.next() {
None => drop(self.stack.pop()),
Some(TokenTree::Group(ref group)) if group.delimiter() == Delimiter::None => {
self.stack.push(group.stream().into_iter());
}
Some(tt) => return Some(tt),
}
}
}
}

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//! [![github]](https://github.com/dtolnay/proc-macro-hack)&ensp;[![crates-io]](https://crates.io/crates/proc-macro-hack)&ensp;[![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&logo=docs.rs
//!
//! <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::doc_markdown,
clippy::manual_strip,
clippy::module_name_repetitions,
clippy::needless_doctest_main,
clippy::needless_pass_by_value,
clippy::too_many_lines,
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,
}
}
}

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use crate::iter::{self, Iter, IterImpl};
use crate::{Define, Error, Export, ExportArgs, FakeCallSite, Input, Macro, Visibility};
use proc_macro::Delimiter::{Brace, Bracket, Parenthesis};
use proc_macro::{Delimiter, Ident, Span, TokenStream, TokenTree};
pub(crate) fn parse_input(tokens: Iter) -> Result<Input, Error> {
let attrs = parse_attributes(tokens)?;
let vis = parse_visibility(tokens);
let kw = parse_ident(tokens)?;
if kw.to_string() == "use" {
parse_export(attrs, vis, tokens).map(Input::Export)
} else if kw.to_string() == "fn" {
parse_define(attrs, vis, kw.span(), tokens).map(Input::Define)
} else {
Err(Error::new(
kw.span(),
"unexpected input to #[proc_macro_hack]",
))
}
}
fn parse_export(attrs: TokenStream, vis: Visibility, tokens: Iter) -> Result<Export, Error> {
let _ = parse_punct(tokens, ':');
let _ = parse_punct(tokens, ':');
let from = parse_ident(tokens)?;
parse_punct(tokens, ':')?;
parse_punct(tokens, ':')?;
let mut macros = Vec::new();
match tokens.peek() {
Some(TokenTree::Group(group)) if group.delimiter() == Brace => {
let ref mut content = iter::new(group.stream());
loop {
macros.push(parse_macro(content)?);
if content.peek().is_none() {
break;
}
parse_punct(content, ',')?;
if content.peek().is_none() {
break;
}
}
tokens.next().unwrap();
}
_ => macros.push(parse_macro(tokens)?),
}
parse_punct(tokens, ';')?;
Ok(Export {
attrs,
vis,
from,
macros,
})
}
fn parse_punct(tokens: Iter, ch: char) -> Result<(), Error> {
match tokens.peek() {
Some(TokenTree::Punct(punct)) if punct.as_char() == ch => {
tokens.next().unwrap();
Ok(())
}
tt => Err(Error::new(
tt.map_or_else(Span::call_site, TokenTree::span),
format!("expected `{}`", ch),
)),
}
}
fn parse_define(
attrs: TokenStream,
vis: Visibility,
fn_token: Span,
tokens: Iter,
) -> Result<Define, Error> {
if vis.is_none() {
return Err(Error::new(
fn_token,
"functions tagged with `#[proc_macro_hack]` must be `pub`",
));
}
let name = parse_ident(tokens)?;
let body = tokens.collect();
Ok(Define { attrs, name, body })
}
fn parse_macro(tokens: Iter) -> Result<Macro, Error> {
let name = parse_ident(tokens)?;
let export_as = match tokens.peek() {
Some(TokenTree::Ident(ident)) if ident.to_string() == "as" => {
tokens.next().unwrap();
parse_ident(tokens)?
}
_ => name.clone(),
};
Ok(Macro { name, export_as })
}
fn parse_ident(tokens: Iter) -> Result<Ident, Error> {
match tokens.next() {
Some(TokenTree::Ident(ident)) => Ok(ident),
tt => Err(Error::new(
tt.as_ref().map_or_else(Span::call_site, TokenTree::span),
"expected identifier",
)),
}
}
fn parse_keyword(tokens: Iter, kw: &'static str) -> Result<(), Error> {
match &tokens.next() {
Some(TokenTree::Ident(ident)) if ident.to_string() == kw => Ok(()),
tt => Err(Error::new(
tt.as_ref().map_or_else(Span::call_site, TokenTree::span),
format!("expected `{}`", kw),
)),
}
}
fn parse_int(tokens: Iter) -> Result<u16, Span> {
match tokens.next() {
Some(TokenTree::Literal(lit)) => lit.to_string().parse().map_err(|_| lit.span()),
Some(tt) => Err(tt.span()),
None => Err(Span::call_site()),
}
}
fn parse_group(tokens: Iter, delimiter: Delimiter) -> Result<IterImpl, Error> {
match &tokens.next() {
Some(TokenTree::Group(group)) if group.delimiter() == delimiter => {
Ok(iter::new(group.stream()))
}
tt => Err(Error::new(
tt.as_ref().map_or_else(Span::call_site, TokenTree::span),
"expected delimiter",
)),
}
}
fn parse_visibility(tokens: Iter) -> Visibility {
if let Some(TokenTree::Ident(ident)) = tokens.peek() {
if ident.to_string() == "pub" {
match tokens.next().unwrap() {
TokenTree::Ident(vis) => return Some(vis),
_ => unreachable!(),
}
}
}
None
}
fn parse_attributes(tokens: Iter) -> Result<TokenStream, Error> {
let mut attrs = TokenStream::new();
while let Some(TokenTree::Punct(punct)) = tokens.peek() {
if punct.as_char() != '#' {
break;
}
let span = punct.span();
attrs.extend(tokens.next());
match tokens.peek() {
Some(TokenTree::Group(group)) if group.delimiter() == Bracket => {
attrs.extend(tokens.next());
}
_ => return Err(Error::new(span, "unexpected input")),
}
}
Ok(attrs)
}
pub(crate) fn parse_export_args(tokens: Iter) -> Result<ExportArgs, Error> {
let mut args = ExportArgs {
support_nested: false,
internal_macro_calls: 0,
fake_call_site: false,
only_hack_old_rustc: false,
};
while let Some(tt) = tokens.next() {
match &tt {
TokenTree::Ident(ident) if ident.to_string() == "support_nested" => {
args.support_nested = true;
}
TokenTree::Ident(ident) if ident.to_string() == "internal_macro_calls" => {
parse_punct(tokens, '=')?;
let calls = parse_int(tokens).map_err(|span| {
Error::new(span, "expected integer value for internal_macro_calls")
})?;
args.internal_macro_calls = calls;
}
TokenTree::Ident(ident) if ident.to_string() == "fake_call_site" => {
args.fake_call_site = true;
}
TokenTree::Ident(ident) if ident.to_string() == "only_hack_old_rustc" => {
args.only_hack_old_rustc = true;
}
_ => {
return Err(Error::new(
tt.span(),
"expected one of: `support_nested`, `internal_macro_calls`, `fake_call_site`, `only_hack_old_rustc`",
));
}
}
if tokens.peek().is_none() {
break;
}
parse_punct(tokens, ',')?;
}
Ok(args)
}
pub(crate) fn parse_define_args(tokens: Iter) -> Result<(), Error> {
match tokens.peek() {
None => Ok(()),
Some(token) => Err(Error::new(
token.span(),
"unexpected argument to proc_macro_hack macro implementation; args are only accepted on the macro declaration (the `pub use`)",
)),
}
}
pub(crate) fn parse_enum_hack(tokens: Iter) -> Result<TokenStream, Error> {
parse_keyword(tokens, "enum")?;
parse_ident(tokens)?;
let ref mut braces = parse_group(tokens, Brace)?;
parse_ident(braces)?;
parse_punct(braces, '=')?;
let ref mut parens = parse_group(braces, Parenthesis)?;
parse_ident(parens)?;
parse_punct(parens, '!')?;
let ref mut inner = parse_group(parens, Brace)?;
let token_stream = inner.collect();
parse_punct(parens, ',')?;
let _ = parens.next();
parse_punct(braces, '.')?;
let _ = braces.next();
parse_punct(braces, ',')?;
Ok(token_stream)
}
pub(crate) fn parse_fake_call_site(tokens: Iter) -> Result<FakeCallSite, Error> {
parse_punct(tokens, '#')?;
let ref mut attr = parse_group(tokens, Bracket)?;
parse_keyword(attr, "derive")?;
let ref mut path = parse_group(attr, Parenthesis)?;
Ok(FakeCallSite {
derive: parse_ident(path)?,
rest: tokens.collect(),
})
}

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use proc_macro::{Ident, TokenStream, TokenTree};
use std::iter;
macro_rules! quote {
() => {
::proc_macro::TokenStream::new()
};
($($tt:tt)*) => {{
let mut tokens = ::proc_macro::TokenStream::new();
quote_each_token!(tokens $($tt)*);
tokens
}};
}
macro_rules! quote_each_token {
($tokens:ident # $var:ident $($rest:tt)*) => {
$crate::quote::Tokens::extend(&mut $tokens, &$var);
quote_each_token!($tokens $($rest)*);
};
($tokens:ident $ident:ident $($rest:tt)*) => {
<::proc_macro::TokenStream as ::std::iter::Extend<_>>::extend(
&mut $tokens,
::std::iter::once(
::proc_macro::TokenTree::Ident(
::proc_macro::Ident::new(
stringify!($ident),
::proc_macro::Span::call_site(),
),
),
),
);
quote_each_token!($tokens $($rest)*);
};
($tokens:ident ( $($inner:tt)* ) $($rest:tt)*) => {
<::proc_macro::TokenStream as ::std::iter::Extend<_>>::extend(
&mut $tokens,
::std::iter::once(
::proc_macro::TokenTree::Group(
::proc_macro::Group::new(
::proc_macro::Delimiter::Parenthesis,
quote!($($inner)*),
),
),
),
);
quote_each_token!($tokens $($rest)*);
};
($tokens:ident [ $($inner:tt)* ] $($rest:tt)*) => {
<::proc_macro::TokenStream as ::std::iter::Extend<_>>::extend(
&mut $tokens,
::std::iter::once(
::proc_macro::TokenTree::Group(
::proc_macro::Group::new(
::proc_macro::Delimiter::Bracket,
quote!($($inner)*),
),
),
),
);
quote_each_token!($tokens $($rest)*);
};
($tokens:ident { $($inner:tt)* } $($rest:tt)*) => {
<::proc_macro::TokenStream as ::std::iter::Extend<_>>::extend(
&mut $tokens,
::std::iter::once(
::proc_macro::TokenTree::Group(
::proc_macro::Group::new(
::proc_macro::Delimiter::Brace,
quote!($($inner)*),
),
),
),
);
quote_each_token!($tokens $($rest)*);
};
($tokens:ident $punct:tt $($rest:tt)*) => {
<::proc_macro::TokenStream as ::std::iter::Extend<_>>::extend(
&mut $tokens,
stringify!($punct).parse::<::proc_macro::TokenStream>(),
);
quote_each_token!($tokens $($rest)*);
};
($tokens:ident) => {};
}
pub trait Tokens {
fn extend(tokens: &mut TokenStream, var: &Self);
}
impl Tokens for Ident {
fn extend(tokens: &mut TokenStream, var: &Self) {
tokens.extend(iter::once(TokenTree::Ident(var.clone())));
}
}
impl Tokens for TokenStream {
fn extend(tokens: &mut TokenStream, var: &Self) {
tokens.extend(var.clone());
}
}
impl<T: Tokens> Tokens for Option<T> {
fn extend(tokens: &mut TokenStream, var: &Self) {
if let Some(var) = var {
T::extend(tokens, var);
}
}
}
impl<T: Tokens> Tokens for &T {
fn extend(tokens: &mut TokenStream, var: &Self) {
T::extend(tokens, var);
}
}

6
third-party/vendor/proc-macro-hack/tests/compiletest.rs vendored Normal file
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@ -0,0 +1,6 @@
#[rustversion::attr(not(nightly), ignore)]
#[test]
fn ui() {
let t = trybuild::TestCases::new();
t.compile_fail("tests/ui/*.rs");
}

8
third-party/vendor/proc-macro-hack/tests/ui/private.rs vendored Normal file
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@ -0,0 +1,8 @@
use proc_macro_hack::proc_macro_hack;
#[proc_macro_hack]
fn my_macro(input: TokenStream) -> TokenStream {
unimplemented!()
}
fn main() {}

5
third-party/vendor/proc-macro-hack/tests/ui/private.stderr vendored Normal file
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@ -0,0 +1,5 @@
error: functions tagged with `#[proc_macro_hack]` must be `pub`
--> tests/ui/private.rs:4:1
|
4 | fn my_macro(input: TokenStream) -> TokenStream {
| ^^

8
third-party/vendor/proc-macro-hack/tests/ui/unexpected-arg.rs vendored Normal file
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@ -0,0 +1,8 @@
use proc_macro_hack::proc_macro_hack;
#[proc_macro_hack(fake_call_site)]
pub fn my_macro(input: TokenStream) -> TokenStream {
unimplemented!()
}
fn main() {}

5
third-party/vendor/proc-macro-hack/tests/ui/unexpected-arg.stderr vendored Normal file
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@ -0,0 +1,5 @@
error: unexpected argument to proc_macro_hack macro implementation; args are only accepted on the macro declaration (the `pub use`)
--> tests/ui/unexpected-arg.rs:3:19
|
3 | #[proc_macro_hack(fake_call_site)]
| ^^^^^^^^^^^^^^

6
third-party/vendor/proc-macro-hack/tests/ui/unexpected.rs vendored Normal file
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@ -0,0 +1,6 @@
use proc_macro_hack::proc_macro_hack;
#[proc_macro_hack]
pub struct What;
fn main() {}

5
third-party/vendor/proc-macro-hack/tests/ui/unexpected.stderr vendored Normal file
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@ -0,0 +1,5 @@
error: unexpected input to #[proc_macro_hack]
--> tests/ui/unexpected.rs:4:5
|
4 | pub struct What;
| ^^^^^^

6
third-party/vendor/proc-macro-hack/tests/ui/unknown-arg.rs vendored Normal file
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@ -0,0 +1,6 @@
use proc_macro_hack::proc_macro_hack;
#[proc_macro_hack(fake_call_site, support_nexted)]
pub use demo::some_macro;
fn main() {}

5
third-party/vendor/proc-macro-hack/tests/ui/unknown-arg.stderr vendored Normal file
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@ -0,0 +1,5 @@
error: expected one of: `support_nested`, `internal_macro_calls`, `fake_call_site`, `only_hack_old_rustc`
--> tests/ui/unknown-arg.rs:3:35
|
3 | #[proc_macro_hack(fake_call_site, support_nexted)]
| ^^^^^^^^^^^^^^