style: Port the style crate to rust 2018.

Differential Revision: https://phabricator.services.mozilla.com/D80101

components/style/Cargo.toml

@@ -6,6 +6,7 @@ license = "MPL-2.0"
 publish = false
 
 build = "build.rs"
+edition = "2018"
 
 # https://github.com/rust-lang/cargo/issues/3544
 links = "servo_style_crate"

components/style/build_gecko.rs

@@ -318,7 +318,7 @@ fn generate_structs() {
 
             fixups.push(Fixup {
                 pat: format!("\\broot\\s*::\\s*{}\\b", gecko),
-                rep: format!("::gecko_bindings::structs::{}", gecko_name),
+                rep: format!("crate::gecko_bindings::structs::{}", gecko_name),
             });
             builder.blacklist_type(gecko).raw_line(format!(
                 "pub type {0}{2} = {1}{2};",

components/style/dom.rs

@@ -816,7 +816,7 @@ pub trait TElement:
         Self: 'a,
         F: FnMut(&'a CascadeData, Self),
     {
-        use rule_collector::containing_shadow_ignoring_svg_use;
+        use crate::rule_collector::containing_shadow_ignoring_svg_use;
 
         let target = self.rule_hash_target();
         if !target.matches_user_and_author_rules() {

components/style/gecko_bindings/sugar/ownership.rs

@@ -4,7 +4,7 @@
 
 //! Helpers for different FFI pointer kinds that Gecko's FFI layer uses.
 
-use gecko_bindings::structs::root::mozilla::detail::CopyablePtr;
+use crate::gecko_bindings::structs::root::mozilla::detail::CopyablePtr;
 use servo_arc::{Arc, RawOffsetArc};
 use std::marker::PhantomData;
 use std::mem::{forget, transmute};

components/style/matching.rs

@@ -371,7 +371,7 @@ trait PrivateMatchMethods: TElement {
             // since we have no way to know whether the decendants
             // need to be traversed at the beginning of the animation-only
             // restyle).
-            let task = ::context::SequentialTask::process_post_animation(
+            let task = crate::context::SequentialTask::process_post_animation(
                 *self,
                 PostAnimationTasks::DISPLAY_CHANGED_FROM_NONE_FOR_SMIL,
             );
@@ -464,8 +464,11 @@ trait PrivateMatchMethods: TElement {
         }
 
         if !tasks.is_empty() {
-            let task =
-                ::context::SequentialTask::update_animations(*self, before_change_style, tasks);
+            let task = crate::context::SequentialTask::update_animations(
+                *self,
+                before_change_style,
+                tasks,
+            );
             context.thread_local.tasks.push(task);
         }
     }

components/style/properties/helpers/animated_properties.mako.rs

@@ -35,7 +35,7 @@ use void::{self, Void};
 #[allow(non_upper_case_globals)]
 impl From<nsCSSPropertyID> for TransitionProperty {
     fn from(property: nsCSSPropertyID) -> TransitionProperty {
-        use properties::ShorthandId;
+        use crate::properties::ShorthandId;
         match property {
             % for prop in data.longhands:
             ${prop.nscsspropertyid()} => {

components/style/values/computed/length.rs

@@ -87,7 +87,7 @@ macro_rules! computed_length_percentage_or_auto {
         /// Returns true if the computed value is absolute 0 or 0%.
         #[inline]
         pub fn is_definitely_zero(&self) -> bool {
-            use values::generics::length::LengthPercentageOrAuto::*;
+            use crate::values::generics::length::LengthPercentageOrAuto::*;
             match *self {
                 LengthPercentage(ref l) => l.is_definitely_zero(),
                 Auto => false,
@@ -102,7 +102,7 @@ pub type LengthPercentageOrAuto = generics::GenericLengthPercentageOrAuto<Length
 impl LengthPercentageOrAuto {
     /// Clamps the value to a non-negative value.
     pub fn clamp_to_non_negative(self) -> Self {
-        use values::generics::length::LengthPercentageOrAuto::*;
+        use crate::values::generics::length::LengthPercentageOrAuto::*;
         match self {
             LengthPercentage(l) => LengthPercentage(l.clamp_to_non_negative()),
             Auto => Auto,
@@ -111,7 +111,7 @@ impl LengthPercentageOrAuto {
 
     /// Convert to have a borrow inside the enum
     pub fn as_ref(&self) -> generics::GenericLengthPercentageOrAuto<&LengthPercentage> {
-        use values::generics::length::LengthPercentageOrAuto::*;
+        use crate::values::generics::length::LengthPercentageOrAuto::*;
         match *self {
             LengthPercentage(ref lp) => LengthPercentage(lp),
             Auto => Auto,
@@ -125,7 +125,7 @@ impl generics::GenericLengthPercentageOrAuto<&LengthPercentage> {
     /// Resolves the percentage.
     #[inline]
     pub fn percentage_relative_to(&self, basis: Length) -> LengthOrAuto {
-        use values::generics::length::LengthPercentageOrAuto::*;
+        use crate::values::generics::length::LengthPercentageOrAuto::*;
         match self {
             LengthPercentage(length_percentage) => {
                 LengthPercentage(length_percentage.percentage_relative_to(basis))
@@ -137,7 +137,7 @@ impl generics::GenericLengthPercentageOrAuto<&LengthPercentage> {
     /// Maybe resolves the percentage.
     #[inline]
     pub fn maybe_percentage_relative_to(&self, basis: Option<Length>) -> LengthOrAuto {
-        use values::generics::length::LengthPercentageOrAuto::*;
+        use crate::values::generics::length::LengthPercentageOrAuto::*;
         match self {
             LengthPercentage(length_percentage) => length_percentage
                 .maybe_percentage_relative_to(basis)

components/style/values/generics/image.rs

@@ -7,13 +7,13 @@
 //! [images]: https://drafts.csswg.org/css-images/#image-values
 
 use crate::custom_properties;
+use crate::values::generics::position::PositionComponent;
 use crate::values::serialize_atom_identifier;
 use crate::Atom;
 use crate::Zero;
 use servo_arc::Arc;
 use std::fmt::{self, Write};
 use style_traits::{CssWriter, ToCss};
-use values::generics::position::PositionComponent;
 
 /// An `<image> | none` value.
 ///

components/style/values/generics/ui.rs

@@ -4,9 +4,9 @@
 
 //! Generic values for UI properties.
 
+use crate::values::specified::ui::CursorKind;
 use std::fmt::{self, Write};
 use style_traits::{CssWriter, ToCss};
-use values::specified::ui::CursorKind;
 
 /// A generic value for the `cursor` property.
 ///