Import proc-macro-error-attr-1.0.2
Change-Id: I20e21e19335cd5a5bfccde08c22f28e530135454
diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
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index 0000000..0b126fe
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,5 @@
+{
+ "git": {
+ "sha1": "69743a4ceab6c8da1ddb473f54a6a01840de90d9"
+ }
+}
diff --git a/Cargo.toml b/Cargo.toml
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--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,41 @@
+# 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 believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+edition = "2018"
+name = "proc-macro-error-attr"
+version = "1.0.2"
+authors = ["CreepySkeleton <creepy-skeleton@yandex.ru>"]
+build = "build.rs"
+description = "Attribute macro for proc-macro-error crate"
+license = "MIT OR Apache-2.0"
+repository = "https://gitlab.com/CreepySkeleton/proc-macro-error"
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[lib]
+proc-macro = true
+[dependencies.proc-macro2]
+version = "1"
+
+[dependencies.quote]
+version = "1"
+
+[dependencies.syn]
+version = "1"
+features = ["derive", "parsing", "proc-macro", "printing"]
+default-features = false
+
+[dependencies.syn-mid]
+version = "0.5"
+[build-dependencies.version_check]
+version = "0.9"
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..7414642
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,26 @@
+[package]
+name = "proc-macro-error-attr"
+version = "1.0.2"
+authors = ["CreepySkeleton <creepy-skeleton@yandex.ru>"]
+edition = "2018"
+description = "Attribute macro for proc-macro-error crate"
+license = "MIT OR Apache-2.0"
+repository = "https://gitlab.com/CreepySkeleton/proc-macro-error"
+
+build = "build.rs"
+
+[lib]
+proc-macro = true
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[dependencies]
+quote = "1"
+proc-macro2 = "1"
+syn-mid = "0.5"
+# "derive" is for `Attribute`, "parsing" is for `Parse`
+syn = { version = "1", default-features = false, features = ["derive", "parsing", "proc-macro", "printing"] }
+
+[build-dependencies]
+version_check = "0.9"
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..658240a
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
+ Apache License
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+ http://www.apache.org/licenses/
+
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diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..fc73e59
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019-2020 CreepySkeleton
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
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+furnished to do so, subject to the following conditions:
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+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
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+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+SOFTWARE.
diff --git a/build.rs b/build.rs
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index 0000000..f2ac6a7
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,5 @@
+fn main() {
+ if version_check::is_max_version("1.36.0").unwrap_or(false) {
+ println!("cargo:rustc-cfg=always_assert_unwind");
+ }
+}
diff --git a/src/lib.rs b/src/lib.rs
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index 0000000..75953fe
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,152 @@
+//! This is `#[proc_macro_error]` attribute to be used with
+//! [`proc-macro-error`](https://docs.rs/proc-macro-error/). There you go.
+
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+use proc_macro2::Ident;
+use quote::quote;
+use std::iter::FromIterator;
+use syn::{
+ parse::{Parse, ParseStream},
+ parse_macro_input,
+ punctuated::Punctuated,
+ Attribute, Token,
+};
+use syn_mid::{Block, ItemFn};
+
+use self::Setting::*;
+
+#[proc_macro_attribute]
+pub fn proc_macro_error(attr: TokenStream, input: TokenStream) -> TokenStream {
+ let input = parse_macro_input!(input as ItemFn);
+ let mut settings = match syn::parse::<Settings>(attr) {
+ Ok(settings) => settings,
+ Err(err) => {
+ let err = err.to_compile_error();
+ return quote!(#input #err).into();
+ }
+ };
+
+ let is_proc_macro = is_proc_macro(&input.attrs);
+ if is_proc_macro {
+ settings.set(AssertUnwindSafe);
+ }
+
+ if detect_proc_macro_hack(&input.attrs) {
+ settings.set(ProcMacroHack);
+ }
+
+ if settings.is_set(ProcMacroHack) {
+ settings.set(AllowNotMacro);
+ }
+
+ if !(settings.is_set(AllowNotMacro) || is_proc_macro) {
+ return quote!(
+ #input
+ compile_error!(
+ "#[proc_macro_error] attribute can be used only with a proc-macro\n\n \
+ = hint: if you are really sure that #[proc_macro_error] should be applied \
+ to this exact function use #[proc_macro_error(allow_not_macro)]\n");
+ )
+ .into();
+ }
+
+ let ItemFn {
+ attrs,
+ vis,
+ sig,
+ block,
+ } = input;
+
+ let body = gen_body(*block, settings);
+
+ quote!(
+ #(#attrs)*
+ #vis
+ #sig
+ { #body }
+ )
+ .into()
+}
+
+#[derive(PartialEq)]
+enum Setting {
+ AssertUnwindSafe,
+ AllowNotMacro,
+ ProcMacroHack,
+}
+
+impl Parse for Setting {
+ fn parse(input: ParseStream) -> syn::Result<Self> {
+ let ident: Ident = input.parse()?;
+ match &*ident.to_string() {
+ "assert_unwind_safe" => Ok(AssertUnwindSafe),
+ "allow_not_macro" => Ok(AllowNotMacro),
+ "proc_macro_hack" => Ok(ProcMacroHack),
+ _ => Err(syn::Error::new(
+ ident.span(),
+ format!(
+ "unknown setting `{}`, expected one of \
+ `assert_unwind_safe`, `allow_not_macro`, `proc_macro_hack`",
+ ident
+ ),
+ )),
+ }
+ }
+}
+
+struct Settings(Vec<Setting>);
+impl Parse for Settings {
+ fn parse(input: ParseStream) -> syn::Result<Self> {
+ let punct = Punctuated::<Setting, Token![,]>::parse_terminated(input)?;
+ Ok(Settings(Vec::from_iter(punct)))
+ }
+}
+
+impl Settings {
+ fn is_set(&self, setting: Setting) -> bool {
+ self.0.iter().any(|s| *s == setting)
+ }
+
+ fn set(&mut self, setting: Setting) {
+ self.0.push(setting)
+ }
+}
+
+#[cfg(not(always_assert_unwind))]
+fn gen_body(block: Block, settings: Settings) -> proc_macro2::TokenStream {
+ let is_proc_macro_hack = settings.is_set(ProcMacroHack);
+ let closure = if settings.is_set(AssertUnwindSafe) {
+ quote!(::std::panic::AssertUnwindSafe(|| #block ))
+ } else {
+ quote!(|| #block)
+ };
+
+ quote!( ::proc_macro_error::entry_point(#closure, #is_proc_macro_hack) )
+}
+
+// FIXME:
+// proc_macro::TokenStream does not implement UnwindSafe until 1.37.0.
+// Considering this is the closure's return type the unwind safety check would fail
+// for virtually every closure possible, the check is meaningless.
+#[cfg(always_assert_unwind)]
+fn gen_body(block: Block, settings: Settings) -> proc_macro2::TokenStream {
+ let is_proc_macro_hack = settings.is_set(ProcMacroHack);
+ let closure = quote!(::std::panic::AssertUnwindSafe(|| #block ));
+ quote!( ::proc_macro_error::entry_point(#closure, #is_proc_macro_hack) )
+}
+
+fn detect_proc_macro_hack(attrs: &[Attribute]) -> bool {
+ attrs
+ .iter()
+ .any(|attr| attr.path.is_ident("proc_macro_hack"))
+}
+
+fn is_proc_macro(attrs: &[Attribute]) -> bool {
+ attrs.iter().any(|attr| {
+ attr.path.is_ident("proc_macro")
+ || attr.path.is_ident("proc_macro_derive")
+ || attr.path.is_ident("proc_macro_attribute")
+ })
+}
