Auto merge of #12118 - emilio:animation-shorthand, r=SimonSapin

style: Add support to the animation shorthand and fix parsing of animation-name

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors

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Part of #11916.

r? @SimonSapin

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components/script/dom/webidls/CSSStyleDeclaration.webidl

@@ -331,6 +331,7 @@ partial interface CSSStyleDeclaration {
   [SetterThrows, TreatNullAs=EmptyString] attribute DOMString alignSelf;
   [SetterThrows, TreatNullAs=EmptyString] attribute DOMString align-self;
 
+  [SetterThrows, TreatNullAs=EmptyString] attribute DOMString animation;
   [SetterThrows, TreatNullAs=EmptyString] attribute DOMString animation-name;
   [SetterThrows, TreatNullAs=EmptyString] attribute DOMString animationName;
   [SetterThrows, TreatNullAs=EmptyString] attribute DOMString animation-duration;

components/style/animation.rs

@@ -626,7 +626,9 @@ where Impl: SelectorImplExt,
             // NB: The spec says that the timing function can be overwritten
             // from the keyframe style.
             let mut timing_function = style.get_box().animation_timing_function_mod(index);
-            if from_style.get_box().animation_timing_function_count() != 0 {
+            if last_keyframe.declared_timing_function {
+                // NB: animation_timing_function can never be empty, always has
+                // at least the default value (`ease`).
                 timing_function = from_style.get_box().animation_timing_function_at(0);
             }
 

components/style/keyframes.rs

@@ -114,15 +114,33 @@ pub struct KeyframesStep {
     /// Declarations that will determine the final style during the step, or
     /// `ComputedValues` if this is an autogenerated step.
     pub value: KeyframesStepValue,
+    /// Wether a animation-timing-function declaration exists in the list of
+    /// declarations.
+    ///
+    /// This is used to know when to override the keyframe animation style.
+    pub declared_timing_function: bool,
 }
 
 impl KeyframesStep {
     #[inline]
     fn new(percentage: KeyframePercentage,
            value: KeyframesStepValue) -> Self {
+        let declared_timing_function = match value {
+            KeyframesStepValue::Declarations(ref declarations) => {
+                declarations.iter().any(|prop_decl| {
+                    match *prop_decl {
+                        PropertyDeclaration::AnimationTimingFunction(..) => true,
+                        _ => false,
+                    }
+                })
+            }
+            _ => false,
+        };
+
         KeyframesStep {
             start_percentage: percentage,
             value: value,
+            declared_timing_function: declared_timing_function,
         }
     }
 }

components/style/properties/helpers.mako.rs

@@ -235,11 +235,21 @@
             }
         }
 
+        pub use self::computed_value::${to_camel_case(name)} as SingleSpecifiedValue;
+
+        #[inline]
+        pub fn parse_one(input: &mut Parser) -> Result<SingleSpecifiedValue, ()> {
+            SingleSpecifiedValue::parse(input)
+        }
+
         #[inline]
         pub fn get_initial_value() -> computed_value::T {
-            computed_value::T(vec![
-                computed_value::${to_camel_case(name)}::${to_rust_ident(values.split()[0])}
-            ])
+            computed_value::T(vec![get_initial_single_value()])
+        }
+
+        #[inline]
+        pub fn get_initial_single_value() -> SingleSpecifiedValue {
+            SingleSpecifiedValue::${to_rust_ident(values.split()[0])}
         }
 
         #[inline]

components/style/properties/longhand/box.mako.rs

@@ -490,8 +490,7 @@ ${helpers.single_keyword("overflow-x", "visible hidden scroll auto",
 
     pub fn parse_one(input: &mut Parser) -> Result<SingleSpecifiedValue,()> {
         if let Ok(function_name) = input.try(|input| input.expect_function()) {
-            return match_ignore_ascii_case! {
-                function_name,
+            return match_ignore_ascii_case! { function_name,
                 "cubic-bezier" => {
                     let (mut p1x, mut p1y, mut p2x, mut p2y) = (0.0, 0.0, 0.0, 0.0);
                     try!(input.parse_nested_block(|input| {
@@ -508,16 +507,17 @@ ${helpers.single_keyword("overflow-x", "visible hidden scroll auto",
                     Ok(TransitionTimingFunction::CubicBezier(p1, p2))
                 },
                 "steps" => {
-                    let (mut step_count, mut start_end) = (0, computed_value::StartEnd::Start);
+                    let (mut step_count, mut start_end) = (0, computed_value::StartEnd::End);
                     try!(input.parse_nested_block(|input| {
                         step_count = try!(specified::parse_integer(input));
-                        try!(input.expect_comma());
-                        start_end = try!(match_ignore_ascii_case! {
-                            try!(input.expect_ident()),
-                            "start" => Ok(computed_value::StartEnd::Start),
-                            "end" => Ok(computed_value::StartEnd::End),
-                            _ => Err(())
-                        });
+                        if input.try(|input| input.expect_comma()).is_ok() {
+                            start_end = try!(match_ignore_ascii_case! {
+                                try!(input.expect_ident()),
+                                "start" => Ok(computed_value::StartEnd::Start),
+                                "end" => Ok(computed_value::StartEnd::End),
+                                _ => Err(())
+                            });
+                        }
                         Ok(())
                     }));
                     Ok(TransitionTimingFunction::Steps(step_count as u32, start_end))
@@ -582,6 +582,12 @@ ${helpers.single_keyword("overflow-x", "visible hidden scroll auto",
         computed_value::T(Vec::new())
     }
 
+
+    #[inline]
+    pub fn parse_one(input: &mut Parser) -> Result<SingleSpecifiedValue, ()> {
+        SingleSpecifiedValue::parse(input)
+    }
+
     pub fn parse(_: &ParserContext, input: &mut Parser) -> Result<SpecifiedValue,()> {
         Ok(SpecifiedValue(try!(input.parse_comma_separated(SingleSpecifiedValue::parse))))
     }
@@ -640,6 +646,18 @@ ${helpers.single_keyword("overflow-x", "visible hidden scroll auto",
     }
 
     pub use self::computed_value::T as SpecifiedValue;
+    pub use string_cache::Atom as SingleSpecifiedValue;
+
+    #[inline]
+    pub fn parse_one(input: &mut Parser) -> Result<SingleSpecifiedValue, ()> {
+        use cssparser::Token;
+
+        Ok(match input.next() {
+            Ok(Token::Ident(ref value)) if value != "none" => Atom::from(&**value),
+            Ok(Token::QuotedString(value)) => Atom::from(&*value),
+            _ => return Err(()),
+        })
+    }
 
     #[inline]
     pub fn get_initial_value() -> computed_value::T {
@@ -648,9 +666,7 @@ ${helpers.single_keyword("overflow-x", "visible hidden scroll auto",
 
     pub fn parse(_: &ParserContext, input: &mut Parser) -> Result<SpecifiedValue,()> {
         use std::borrow::Cow;
-        Ok(SpecifiedValue(try!(input.parse_comma_separated(|input| {
-            input.expect_ident().map(Atom::from)
-        }))))
+        Ok(SpecifiedValue(try!(input.parse_comma_separated(parse_one))))
     }
 
     impl ComputedValueAsSpecified for SpecifiedValue {}
@@ -660,16 +676,20 @@ ${helpers.single_keyword("overflow-x", "visible hidden scroll auto",
                    need_index="True"
                    animatable="False">
     pub use super::transition_duration::computed_value;
-    pub use super::transition_duration::{parse, get_initial_value};
+    pub use super::transition_duration::{get_initial_value, get_initial_single_value};
+    pub use super::transition_duration::{parse, parse_one};
     pub use super::transition_duration::SpecifiedValue;
+    pub use super::transition_duration::SingleSpecifiedValue;
 </%helpers:longhand>
 
 <%helpers:longhand name="animation-timing-function"
                    need_index="True"
                    animatable="False">
     pub use super::transition_timing_function::computed_value;
-    pub use super::transition_timing_function::{parse, get_initial_value};
+    pub use super::transition_timing_function::{get_initial_value, get_initial_single_value};
+    pub use super::transition_timing_function::{parse, parse_one};
     pub use super::transition_timing_function::SpecifiedValue;
+    pub use super::transition_timing_function::SingleSpecifiedValue;
 </%helpers:longhand>
 
 <%helpers:longhand name="animation-iteration-count"
@@ -720,8 +740,14 @@ ${helpers.single_keyword("overflow-x", "visible hidden scroll auto",
     }
 
     pub use self::computed_value::AnimationIterationCount;
+    pub use self::computed_value::AnimationIterationCount as SingleSpecifiedValue;
     pub use self::computed_value::T as SpecifiedValue;
 
+    #[inline]
+    pub fn get_initial_single_value() -> AnimationIterationCount {
+        AnimationIterationCount::Number(1)
+    }
+
     pub fn parse_one(input: &mut Parser) -> Result<AnimationIterationCount, ()> {
         if input.try(|input| input.expect_ident_matching("infinite")).is_ok() {
             Ok(AnimationIterationCount::Infinite)
@@ -740,8 +766,9 @@ ${helpers.single_keyword("overflow-x", "visible hidden scroll auto",
         Ok(SpecifiedValue(try!(input.parse_comma_separated(parse_one))))
     }
 
+    #[inline]
     pub fn get_initial_value() -> computed_value::T {
-        computed_value::T(vec![AnimationIterationCount::Number(1)])
+        computed_value::T(vec![get_initial_single_value()])
     }
 
     impl ComputedValueAsSpecified for SpecifiedValue {}
@@ -767,8 +794,10 @@ ${helpers.keyword_list("animation-fill-mode",
                    need_index="True"
                    animatable="False">
     pub use super::transition_duration::computed_value;
-    pub use super::transition_duration::{parse, get_initial_value};
+    pub use super::transition_duration::{get_initial_value, get_initial_single_value};
+    pub use super::transition_duration::{parse, parse_one};
     pub use super::transition_duration::SpecifiedValue;
+    pub use super::transition_duration::SingleSpecifiedValue;
 </%helpers:longhand>
 
 // CSSOM View Module

components/style/properties/longhand/color.mako.rs

@@ -25,7 +25,8 @@
         use cssparser;
         pub type T = cssparser::RGBA;
     }
-    #[inline] pub fn get_initial_value() -> computed_value::T {
+    #[inline]
+    pub fn get_initial_value() -> computed_value::T {
         RGBA { red: 0., green: 0., blue: 0., alpha: 1. }  /* black */
     }
     pub fn parse_specified(_context: &ParserContext, input: &mut Parser)

components/style/properties/shorthand/box.mako.rs

@@ -14,8 +14,20 @@
     })
 </%helpers:shorthand>
 
+macro_rules! try_parse_one {
+    ($input: expr, $var: ident, $prop_module: ident) => {
+        if $var.is_none() {
+            if let Ok(value) = $input.try($prop_module::parse_one) {
+                $var = Some(value);
+                continue;
+            }
+        }
+    }
+}
+
 <%helpers:shorthand name="transition"
-                    sub_properties="transition-property transition-duration transition-timing-function
+                    sub_properties="transition-property transition-duration
+                                    transition-timing-function
                                     transition-delay">
     use properties::longhands::{transition_delay, transition_duration, transition_property};
     use properties::longhands::{transition_timing_function};
@@ -31,35 +43,10 @@
         let (mut property, mut duration) = (None, None);
         let (mut timing_function, mut delay) = (None, None);
         loop {
-            if property.is_none() {
-                if let Ok(value) = input.try(transition_property::SingleSpecifiedValue::parse) {
-                    property = Some(value);
-                    continue
-                }
-            }
-
-            if duration.is_none() {
-                if let Ok(value) = input.try(|input| transition_duration::parse_one(input)) {
-                    duration = Some(value);
-                    continue
-                }
-            }
-
-            if timing_function.is_none() {
-                if let Ok(value) = input.try(|input| {
-                    transition_timing_function::parse_one(input)
-                }) {
-                    timing_function = Some(value);
-                    continue
-                }
-            }
-
-            if delay.is_none() {
-                if let Ok(value) = input.try(|input| transition_delay::parse_one(input)) {
-                    delay = Some(value);
-                    continue;
-                }
-            }
+            try_parse_one!(input, property, transition_property);
+            try_parse_one!(input, duration, transition_duration);
+            try_parse_one!(input, timing_function, transition_timing_function);
+            try_parse_one!(input, delay, transition_delay);
 
             break
         }
@@ -68,12 +55,12 @@
             Ok(SingleTransition {
                 transition_property: property,
                 transition_duration:
-                    duration.unwrap_or(transition_duration::get_initial_single_value()),
+                    duration.unwrap_or_else(transition_duration::get_initial_single_value),
                 transition_timing_function:
-                    timing_function.unwrap_or(
-                        transition_timing_function::get_initial_single_value()),
+                    timing_function.unwrap_or_else(
+                        transition_timing_function::get_initial_single_value),
                 transition_delay:
-                    delay.unwrap_or(transition_delay::get_initial_single_value()),
+                    delay.unwrap_or_else(transition_delay::get_initial_single_value),
             })
         } else {
             Err(())
@@ -107,3 +94,121 @@
         transition_delay: Some(transition_delay::SpecifiedValue(delays)),
     })
 </%helpers:shorthand>
+
+<%helpers:shorthand name="animation"
+                    sub_properties="animation-name animation-duration
+                                    animation-timing-function animation-delay
+                                    animation-iteration-count animation-direction
+                                    animation-fill-mode animation-play-state">
+    use properties::longhands::{animation_name, animation_duration, animation_timing_function};
+    use properties::longhands::{animation_delay, animation_iteration_count, animation_direction};
+    use properties::longhands::{animation_fill_mode, animation_play_state};
+
+    struct SingleAnimation {
+        animation_name: animation_name::SingleSpecifiedValue,
+        animation_duration: animation_duration::SingleSpecifiedValue,
+        animation_timing_function: animation_timing_function::SingleSpecifiedValue,
+        animation_delay: animation_delay::SingleSpecifiedValue,
+        animation_iteration_count: animation_iteration_count::SingleSpecifiedValue,
+        animation_direction: animation_direction::SingleSpecifiedValue,
+        animation_fill_mode: animation_fill_mode::SingleSpecifiedValue,
+        animation_play_state: animation_play_state::SingleSpecifiedValue,
+    }
+
+    fn parse_one_animation(input: &mut Parser) -> Result<SingleAnimation,()> {
+        let mut duration = None;
+        let mut timing_function = None;
+        let mut delay = None;
+        let mut iteration_count = None;
+        let mut direction = None;
+        let mut fill_mode = None;
+        let mut play_state = None;
+        let mut name = None;
+
+        // NB: Name must be the last one here so that keywords valid for other
+        // longhands are not interpreted as names.
+        //
+        // Also, duration must be before delay, see
+        // https://drafts.csswg.org/css-animations/#typedef-single-animation
+        loop {
+            try_parse_one!(input, duration, animation_duration);
+            try_parse_one!(input, timing_function, animation_timing_function);
+            try_parse_one!(input, delay, animation_delay);
+            try_parse_one!(input, iteration_count, animation_iteration_count);
+            try_parse_one!(input, direction, animation_direction);
+            try_parse_one!(input, fill_mode, animation_fill_mode);
+            try_parse_one!(input, play_state, animation_play_state);
+            try_parse_one!(input, name, animation_name);
+
+            break
+        }
+
+        if let Some(name) = name {
+            Ok(SingleAnimation {
+                animation_name: name,
+                animation_duration:
+                    duration.unwrap_or_else(animation_duration::get_initial_single_value),
+                animation_timing_function:
+                    timing_function.unwrap_or_else(animation_timing_function::get_initial_single_value),
+                animation_delay:
+                    delay.unwrap_or_else(animation_delay::get_initial_single_value),
+                animation_iteration_count:
+                    iteration_count.unwrap_or_else(animation_iteration_count::get_initial_single_value),
+                animation_direction:
+                    direction.unwrap_or_else(animation_direction::get_initial_single_value),
+                animation_fill_mode:
+                    fill_mode.unwrap_or_else(animation_fill_mode::get_initial_single_value),
+                animation_play_state:
+                    play_state.unwrap_or_else(animation_play_state::get_initial_single_value),
+            })
+        } else {
+            Err(())
+        }
+    }
+
+    if input.try(|input| input.expect_ident_matching("none")).is_ok() {
+        return Ok(Longhands {
+            animation_name: None,
+            animation_duration: None,
+            animation_timing_function: None,
+            animation_delay: None,
+            animation_iteration_count: None,
+            animation_direction: None,
+            animation_fill_mode: None,
+            animation_play_state: None,
+        })
+    }
+
+    let results = try!(input.parse_comma_separated(parse_one_animation));
+
+    let mut names = vec![];
+    let mut durations = vec![];
+    let mut timing_functions = vec![];
+    let mut delays = vec![];
+    let mut iteration_counts = vec![];
+    let mut directions = vec![];
+    let mut fill_modes = vec![];
+    let mut play_states = vec![];
+
+    for result in results.into_iter() {
+        names.push(result.animation_name);
+        durations.push(result.animation_duration);
+        timing_functions.push(result.animation_timing_function);
+        delays.push(result.animation_delay);
+        iteration_counts.push(result.animation_iteration_count);
+        directions.push(result.animation_direction);
+        fill_modes.push(result.animation_fill_mode);
+        play_states.push(result.animation_play_state);
+    }
+
+    Ok(Longhands {
+        animation_name: Some(animation_name::SpecifiedValue(names)),
+        animation_duration: Some(animation_duration::SpecifiedValue(durations)),
+        animation_timing_function: Some(animation_timing_function::SpecifiedValue(timing_functions)),
+        animation_delay: Some(animation_delay::SpecifiedValue(delays)),
+        animation_iteration_count: Some(animation_iteration_count::SpecifiedValue(iteration_counts)),
+        animation_direction: Some(animation_direction::SpecifiedValue(directions)),
+        animation_fill_mode: Some(animation_fill_mode::SpecifiedValue(fill_modes)),
+        animation_play_state: Some(animation_play_state::SpecifiedValue(play_states)),
+    })
+</%helpers:shorthand>

tests/html/animation-timing-function-override-from-keyframes.html

@@ -0,0 +1,23 @@
+<!doctype html>
+<meta charset="utf-8">
+<style>
+  @keyframes foo {
+    from { background: white; animation-timing-function: ease; }
+    to { background: black; }
+  }
+
+  @keyframes bar {
+    from { background: white }
+    to { background: black }
+  }
+
+  div {
+    height: 50px;
+    width: 100px;
+    animation: foo 1s infinite steps(4, end);
+  }
+  .bar { animation-name: bar }
+</style>
+<p>You should see an eased animation in the first-element, and a stepped one in the second one</p>
+<div></div>
+<div class="bar"></div>

tests/wpt/metadata-css/css-flexbox-1_dev/html/css-flexbox-height-animation-stretch.htm.ini

@@ -0,0 +1,4 @@
+[css-flexbox-height-animation-stretch.htm]
+  type: reftest
+  expected: TIMEOUT
+  bug: https://github.com/servo/servo/issues/12328

tests/wpt/metadata-css/css-transitions-1_dev/html/transition-timing-function-001.htm.ini

@@ -1,8 +1,5 @@
 [transition-timing-function-001.htm]
   type: testharness
-  [parse 'steps(3)']
-    expected: FAIL
-
   [parse 'cubic-bezier(-0.1, -0.2, -0.3, -0.4)']
     expected: FAIL