style: Factor out some of style_derive.

Differential Revision: https://phabricator.services.mozilla.com/D17188

components/derive_common/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "derive_common"
+version = "0.0.1"
+authors = ["The Servo Project Developers"]
+license = "MPL-2.0"
+publish = false
+
+[lib]
+path = "lib.rs"
+
+[dependencies]
+darling = "0.8"
+proc-macro2 = "0.4"
+quote = "0.6"
+syn = { version = "0.15", features = ["visit"] }
+synstructure = "0.10"

components/derive_common/lib.rs

@@ -0,0 +1,14 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+extern crate darling;
+extern crate proc_macro;
+extern crate proc_macro2;
+#[macro_use]
+extern crate quote;
+#[macro_use]
+extern crate syn;
+extern crate synstructure;
+
+pub mod cg;

components/style_derive/Cargo.toml

@@ -11,6 +11,7 @@ proc-macro = true
 
 [dependencies]
 darling = "0.8"
+derive_common = { path = "../derive_common" }
 proc-macro2 = "0.4"
 quote = "0.6"
 syn = { version = "0.15", features = ["visit"] }

components/style_derive/animate.rs

@@ -2,8 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use crate::cg;
 use darling::util::IdentList;
+use derive_common::cg;
 use proc_macro2::TokenStream;
 use quote::TokenStreamExt;
 use syn::{DeriveInput, Path, WhereClause};

components/style_derive/compute_squared_distance.rs

@@ -3,7 +3,7 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 use crate::animate::{AnimationFieldAttrs, AnimationInputAttrs, AnimationVariantAttrs};
-use crate::cg;
+use derive_common::cg;
 use proc_macro2::TokenStream;
 use quote::TokenStreamExt;
 use syn::{DeriveInput, Path};

components/style_derive/lib.rs

@@ -6,6 +6,7 @@
 
 #[macro_use]
 extern crate darling;
+extern crate derive_common;
 extern crate proc_macro;
 extern crate proc_macro2;
 #[macro_use]
@@ -17,7 +18,6 @@ extern crate synstructure;
 use proc_macro::TokenStream;
 
 mod animate;
-mod cg;
 mod compute_squared_distance;
 mod parse;
 mod specified_value_info;

components/style_derive/parse.rs

@@ -2,8 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use crate::cg;
 use crate::to_css::CssVariantAttrs;
+use derive_common::cg;
 use proc_macro2::TokenStream;
 use syn::{self, DeriveInput, Path};
 use synstructure::{Structure, VariantInfo};

components/style_derive/specified_value_info.rs

@@ -2,9 +2,9 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use crate::cg;
 use crate::parse::ParseVariantAttrs;
 use crate::to_css::{CssFieldAttrs, CssInputAttrs, CssVariantAttrs};
+use derive_common::cg;
 use proc_macro2::TokenStream;
 use quote::TokenStreamExt;
 use syn::{Data, DeriveInput, Fields, Ident, Type};

components/style_derive/to_animated_value.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use crate::cg;
+use derive_common::cg;
 use proc_macro2::{Span, TokenStream};
 use syn::{DeriveInput, Ident};
 use synstructure::BindStyle;

components/style_derive/to_animated_zero.rs

@@ -3,7 +3,7 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 use crate::animate::{AnimationFieldAttrs, AnimationInputAttrs, AnimationVariantAttrs};
-use crate::cg;
+use derive_common::cg;
 use proc_macro2::TokenStream;
 use quote::TokenStreamExt;
 use syn;

components/style_derive/to_computed_value.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use crate::cg;
+use derive_common::cg;
 use proc_macro2::{Span, TokenStream};
 use syn::{DeriveInput, Ident};
 use synstructure::BindStyle;

components/style_derive/to_css.rs

@@ -2,8 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use crate::cg;
 use darling::util::Override;
+use derive_common::cg;
 use proc_macro2::TokenStream;
 use quote::{ToTokens, TokenStreamExt};
 use syn::{self, Data, Path, WhereClause};