servo: Merge #15715 - Make #[dom_struct] a proc_macro attribute (from nox:custom-derive); r=SimonSapin

The rustup is needed for rust-lang/rust#40039.

Source-Repo: https://github.com/servo/servo
Source-Revision: a204c4176dcccdad8ec99d74055c66794c3f64ba

Author: nox

servo/Cargo.lock

@@ -0,0 +1,13 @@
+[package]
+name = "dom_struct"
+version = "0.0.1"
+authors = ["The Servo Project Developers"]
+license = "MPL-2.0"
+publish = false
+
+[lib]
+path = "lib.rs"
+proc-macro = true
+
+[dependencies]
+quote = "0.3"

servo/components/dom_struct/Cargo.toml

@@ -0,0 +1,28 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#![feature(proc_macro)]
+
+extern crate proc_macro;
+#[macro_use] extern crate quote;
+
+use proc_macro::TokenStream;
+
+#[proc_macro_attribute]
+pub fn dom_struct(args: TokenStream, input: TokenStream) -> TokenStream {
+    if !args.to_string().is_empty() {
+        panic!("#[dom_struct] takes no arguments");
+    }
+    expand_string(&input.to_string()).parse().unwrap()
+}
+
+fn expand_string(input: &str) -> String {
+    let mut tokens = quote! {
+        #[derive(DenyPublicFields, DomObject, HeapSizeOf, JSTraceable)]
+        #[must_root]
+        #[repr(C)]
+    };
+    tokens.append(input);
+    tokens.to_string()
+}

servo/components/dom_struct/lib.rs

@@ -37,6 +37,7 @@ cookie = "0.2.5"
 cssparser = {version = "0.10", features = ["heapsize", "serde"]}
 deny_public_fields = {path = "../deny_public_fields"}
 devtools_traits = {path = "../devtools_traits"}
+dom_struct = {path = "../dom_struct"}
 domobject_derive = {path = "../domobject_derive"}
 encoding = "0.2"
 euclid = "0.11"

servo/components/script/Cargo.toml

@@ -12,6 +12,7 @@ use dom::bindings::str::DOMString;
 use dom::element::{AttributeMutation, Element};
 use dom::virtualmethods::vtable_for;
 use dom::window::Window;
+use dom_struct::dom_struct;
 use html5ever_atoms::{Prefix, LocalName, Namespace};
 use servo_atoms::Atom;
 use std::borrow::ToOwned;

servo/components/script/docs/JS-Servos-only-GC.md

@@ -14,6 +14,7 @@ use dom::bindings::reflector::reflect_dom_object;
 use dom::bindings::str::DOMString;
 use dom::event::{Event, EventBubbles, EventCancelable};
 use dom::window::Window;
+use dom_struct::dom_struct;
 use servo_atoms::Atom;
 
 // https://html.spec.whatwg.org/multipage/#beforeunloadevent

servo/components/script/dom/attr.rs

@@ -14,6 +14,7 @@ use dom::bindings::js::{JS, Root};
 use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
 use dom::bindings::trace::JSTraceable;
 use dom::globalscope::GlobalScope;
+use dom_struct::dom_struct;
 use js::conversions::ToJSValConvertible;
 use js::jsapi::{HandleValue, Heap, JSContext, JSObject, MutableHandleObject};
 use js::jsval::UndefinedValue;

servo/components/script/dom/beforeunloadevent.rs

@@ -11,6 +11,7 @@ use dom::bindings::js::{JS, Root};
 use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
 use dom::bindings::str::DOMString;
 use dom::globalscope::GlobalScope;
+use dom_struct::dom_struct;
 use encoding::all::UTF_8;
 use encoding::types::{EncoderTrap, Encoding};
 use ipc_channel::ipc;

servo/components/script/dom/bindings/iterable.rs

@@ -30,6 +30,7 @@ use dom::eventtarget::EventTarget;
 use dom::globalscope::GlobalScope;
 use dom::permissions::{get_descriptor_permission_state, PermissionAlgorithm};
 use dom::promise::Promise;
+use dom_struct::dom_struct;
 use ipc_channel::ipc::{self, IpcSender};
 use ipc_channel::router::ROUTER;
 use js::conversions::ConversionResult;