Squashed 'third_party/autocxx/' content from commit 629e8fa53
git-subtree-dir: third_party/autocxx
git-subtree-split: 629e8fa531a633164c0b52e2a3cab536d4cd0849
Signed-off-by: Brian Silverman <bsilver16384@gmail.com>
Change-Id: I62a03b0049f49adf029e0204639cdb5468dde1a1
diff --git a/parser/src/subclass_attrs.rs b/parser/src/subclass_attrs.rs
new file mode 100644
index 0000000..9174bec
--- /dev/null
+++ b/parser/src/subclass_attrs.rs
@@ -0,0 +1,58 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use proc_macro2::Ident;
+use quote::ToTokens;
+use syn::Result as ParseResult;
+use syn::{
+ parse::{Parse, ParseStream},
+ token::Comma,
+};
+
+#[derive(Default)]
+pub struct SubclassAttrs {
+ pub self_owned: bool,
+ pub superclass: Option<String>,
+}
+
+impl Parse for SubclassAttrs {
+ fn parse(input: ParseStream) -> ParseResult<Self> {
+ let mut me = Self::default();
+ let mut id = input.parse::<Option<Ident>>()?;
+ while id.is_some() {
+ match id {
+ Some(id) if id == "self_owned" => me.self_owned = true,
+ Some(id) if id == "superclass" => {
+ let args;
+ syn::parenthesized!(args in input);
+ let superclass: syn::LitStr = args.parse()?;
+ if me.superclass.is_some() {
+ return Err(syn::Error::new_spanned(
+ id.into_token_stream(),
+ "Expected single superclass specification",
+ ));
+ }
+ me.superclass = Some(superclass.value());
+ }
+ Some(id) => {
+ return Err(syn::Error::new_spanned(
+ id.into_token_stream(),
+ "Expected self_owned or superclass",
+ ))
+ }
+ None => {}
+ };
+ let comma = input.parse::<Option<Comma>>()?;
+ if comma.is_none() {
+ break;
+ }
+ id = input.parse::<Option<Ident>>()?;
+ }
+ Ok(me)
+ }
+}