Auto merge of #13890 - Wafflespeanut:glue, r=Manishearth

Auto-generate some glue

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build-geckolib` does not report any errors

<!-- Either: -->
- [x] These changes do not require tests because it's a refactor

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

r? @Manishearth or @emilio

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/13890)
<!-- Reviewable:end -->

components/style/properties/data.py

@@ -63,7 +63,7 @@ class Longhand(object):
     def __init__(self, style_struct, name, animatable=None, derived_from=None, keyword=None,
                  predefined_type=None, custom_cascade=False, experimental=False, internal=False,
                  need_clone=False, need_index=False, gecko_ffi_name=None, depend_on_viewport_size=False,
-                 allowed_in_keyframe_block=True):
+                 allowed_in_keyframe_block=True, complex_color=False):
         self.name = name
         self.keyword = keyword
         self.predefined_type = predefined_type
@@ -77,6 +77,7 @@ class Longhand(object):
         self.gecko_ffi_name = gecko_ffi_name or "m" + self.camel_case
         self.depend_on_viewport_size = depend_on_viewport_size
         self.derived_from = (derived_from or "").split()
+        self.complex_color = complex_color
 
         # https://drafts.csswg.org/css-animations/#keyframes
         # > The <declaration-list> inside of <keyframe-block> accepts any CSS property

components/style/properties/gecko.mako.rs

@@ -481,16 +481,29 @@ impl Debug for ${style_struct.gecko_struct_name} {
 
     # Types used with predefined_type()-defined properties that we can auto-generate.
     predefined_types = {
+        "Length": impl_style_coord,
         "LengthOrPercentage": impl_style_coord,
         "LengthOrPercentageOrAuto": impl_style_coord,
         "LengthOrPercentageOrNone": impl_style_coord,
         "Number": impl_simple,
         "Opacity": impl_simple,
+        "CSSColor": impl_color,
     }
 
-    keyword_longhands = [x for x in longhands if x.keyword and not x.name in force_stub]
+    def predefined_type_method(longhand):
+        args = dict(ident=longhand.ident, gecko_ffi_name=longhand.gecko_ffi_name,
+                    need_clone=longhand.need_clone)
+        method = predefined_types[longhand.predefined_type]
+
+        # additional type-specific arguments
+        if longhand.predefined_type in ["CSSColor"]:
+            args.update(complex_color=longhand.complex_color)
+
+        method(**args)
+
+    keyword_longhands = [x for x in longhands if x.keyword and x.name not in force_stub]
     predefined_longhands = [x for x in longhands
-                           if x.predefined_type in predefined_types and not x.name in force_stub]
+                            if x.predefined_type in predefined_types and x.name not in force_stub]
     stub_longhands = [x for x in longhands if x not in keyword_longhands + predefined_longhands]
 
     # If one of the longhands is not handled
@@ -523,8 +536,7 @@ impl ${style_struct.gecko_struct_name} {
     for longhand in keyword_longhands:
         impl_keyword(longhand.ident, longhand.gecko_ffi_name, longhand.keyword, longhand.need_clone)
     for longhand in predefined_longhands:
-        impl_fn = predefined_types[longhand.predefined_type]
+        predefined_type_method(longhand)
-        impl_fn(longhand.ident, longhand.gecko_ffi_name, need_clone=longhand.need_clone)
     %>
 
     /*
@@ -721,7 +733,7 @@ fn static_assert() {
 
 </%self:impl_trait>
 
-<% skip_outline_longhands = " ".join("outline-color outline-style outline-width".split() +
+<% skip_outline_longhands = " ".join("outline-style outline-width".split() +
                                      ["-moz-outline-radius-{0}".format(x.ident.replace("_", ""))
                                       for x in CORNERS]) %>
 <%self:impl_trait style_struct_name="Outline"
@@ -730,8 +742,6 @@ fn static_assert() {
 
     <% impl_keyword("outline_style", "mOutlineStyle", border_style_keyword, need_clone=True) %>
 
-    <% impl_color("outline_color", "mOutlineColor", need_clone=True) %>
-
     <% impl_app_units("outline_width", "mActualOutlineWidth", need_clone=True,
                       round_to_pixels=True) %>
 
@@ -1440,7 +1450,7 @@ fn static_assert() {
 // TODO: Gecko accepts lists in most background-related properties. We just use
 // the first element (which is the common case), but at some point we want to
 // add support for parsing these lists in servo and pushing to nsTArray's.
-<% skip_background_longhands = """background-color background-repeat
+<% skip_background_longhands = """background-repeat
                                   background-image background-clip
                                   background-origin background-attachment
                                   background-size background-position""" %>
@@ -1448,8 +1458,6 @@ fn static_assert() {
                   skip_longhands="${skip_background_longhands}"
                   skip_additionals="*">
 
-    <% impl_color("background_color", "mBackgroundColor", need_clone=True, complex_color=False) %>
-
     <% impl_common_image_layer_properties("background") %>
 
     <%self:simple_image_array_property name="attachment" shorthand="background" field_name="mAttachment">
@@ -1739,11 +1747,9 @@ fn static_assert() {
 </%self:impl_trait>
 
 <%self:impl_trait style_struct_name="Text"
-                  skip_longhands="text-decoration-color text-decoration-line text-overflow"
+                  skip_longhands="text-decoration-line text-overflow"
                   skip_additionals="*">
 
-    ${impl_color("text_decoration_color", "mTextDecorationColor", need_clone=True)}
-
     pub fn set_text_decoration_line(&mut self, v: longhands::text_decoration_line::computed_value::T) {
         let mut bits: u8 = 0;
         if v.underline {
@@ -1833,7 +1839,6 @@ fn static_assert() {
 </%self:impl_trait>
 
 <% skip_svg_longhands = """
-flood-color lighting-color stop-color
 mask-mode mask-repeat mask-clip mask-origin mask-composite mask-position mask-size mask-image
 clip-path
 """
@@ -1842,12 +1847,6 @@ clip-path
                   skip_longhands="${skip_svg_longhands}"
                   skip_additionals="*">
 
-    <% impl_color("flood_color", "mFloodColor", complex_color=False) %>
-
-    <% impl_color("lighting_color", "mLightingColor", complex_color=False) %>
-
-    <% impl_color("stop_color", "mStopColor", complex_color=False) %>
-
     <% impl_common_image_layer_properties("mask") %>
 
     <%self:simple_image_array_property name="mode" shorthand="mask" field_name="mMaskMode">

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

@@ -11,7 +11,7 @@
 
 // TODO(pcwalton): `invert`
 ${helpers.predefined_type("outline-color", "CSSColor", "::cssparser::Color::CurrentColor",
-                          animatable=True)}
+                          animatable=True, complex_color=True, need_clone=True)}
 
 <%helpers:longhand name="outline-style" need_clone="True" animatable="False">
     pub use values::specified::BorderStyle as SpecifiedValue;

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

@@ -209,5 +209,6 @@ ${helpers.single_keyword("text-decoration-style",
 ${helpers.predefined_type(
     "text-decoration-color", "CSSColor",
     "CSSParserColor::RGBA(RGBA { red: 0.0, green: 0.0, blue: 0.0, alpha: 1.0 })",
+    complex_color=True,
     products="gecko",
     animatable=True)}