style: Implement overflow-wrap: anywhere.

Per https://github.com/w3c/csswg-drafts/issues/2682

Differential Revision: https://phabricator.services.mozilla.com/D11328

components/style/cbindgen.toml

@@ -49,6 +49,7 @@ include = [
   "FontDisplay",
   "FontFaceSourceListComponent",
   "FontLanguageOverride",
+  "OverflowWrap",
   "TimingFunction",
   "PathCommand",
   "UnicodeRange",

components/style/properties/data.py

@@ -324,6 +324,7 @@ class Longhand(object):
                 "Opacity",
                 "OutlineStyle",
                 "OverflowClipBox",
+                "OverflowWrap",
                 "OverscrollBehavior",
                 "Percentage",
                 "Resize",

components/style/properties/gecko.mako.rs

@@ -1419,6 +1419,7 @@ impl Clone for ${style_struct.gecko_struct_name} {
         "NonNegativeNumber": impl_simple,
         "Number": impl_simple,
         "Opacity": impl_simple,
+        "OverflowWrap": impl_simple,
         "Perspective": impl_style_coord,
         "Position": impl_position,
         "RGBAColor": impl_rgba_color,

components/style/properties/longhands/inherited_text.mako.rs

@@ -61,15 +61,16 @@ ${helpers.predefined_type(
     servo_restyle_damage = "reflow",
 )}
 
-// Also known as "word-wrap" (which is more popular because of IE), but this is the preferred
+// Also known as "word-wrap" (which is more popular because of IE), but this is
-// name per CSS-TEXT 6.2.
+// the preferred name per CSS-TEXT 6.2.
-${helpers.single_keyword(
+${helpers.predefined_type(
     "overflow-wrap",
-    "normal break-word",
+    "OverflowWrap",
-    gecko_constant_prefix="NS_STYLE_OVERFLOWWRAP",
+    "computed::OverflowWrap::Normal",
     animation_value_type="discrete",
     spec="https://drafts.csswg.org/css-text/#propdef-overflow-wrap",
     alias="word-wrap",
+    needs_context=False,
     servo_restyle_damage="rebuild_and_reflow",
 )}
 

components/style/values/computed/mod.rs

@@ -78,7 +78,7 @@ pub use self::svg::{SVGPaintOrder, SVGStrokeDashArray, SVGWidth};
 pub use self::table::XSpan;
 pub use self::text::{InitialLetter, LetterSpacing, LineHeight, MozTabSize};
 pub use self::text::{TextAlign, TextEmphasisPosition, TextEmphasisStyle};
-pub use self::text::{TextOverflow, WordSpacing};
+pub use self::text::{TextOverflow, WordSpacing, OverflowWrap};
 pub use self::time::Time;
 pub use self::transform::{Rotate, Scale, Transform, TransformOperation};
 pub use self::transform::{TransformOrigin, TransformStyle, Translate};

components/style/values/computed/text.rs

@@ -21,6 +21,7 @@ use style_traits::{CssWriter, ToCss};
 
 pub use crate::values::specified::TextAlignKeyword as TextAlign;
 pub use crate::values::specified::TextEmphasisPosition;
+pub use crate::values::specified::OverflowWrap;
 
 /// A computed value for the `initial-letter` property.
 pub type InitialLetter = GenericInitialLetter<CSSFloat, CSSInteger>;

components/style/values/specified/mod.rs

@@ -76,7 +76,7 @@ pub use self::svg_path::SVGPathData;
 pub use self::table::XSpan;
 pub use self::text::{InitialLetter, LetterSpacing, LineHeight, MozTabSize, TextAlign};
 pub use self::text::{TextAlignKeyword, TextDecorationLine, TextOverflow, WordSpacing};
-pub use self::text::{TextEmphasisPosition, TextEmphasisStyle};
+pub use self::text::{TextEmphasisPosition, TextEmphasisStyle, OverflowWrap};
 pub use self::time::Time;
 pub use self::transform::{Rotate, Scale, Transform};
 pub use self::transform::{TransformOrigin, TransformStyle, Translate};

components/style/values/specified/text.rs

@@ -661,6 +661,8 @@ impl ToComputedValue for TextEmphasisStyle {
     fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
         match *self {
             TextEmphasisStyle::Keyword(ref keyword) => {
+                // FIXME(emilio): This should set the rule_cache_conditions
+                // properly.
                 let default_shape = if context.style().get_inherited_box().clone_writing_mode() ==
                     SpecifiedWritingMode::HorizontalTb
                 {
@@ -682,6 +684,7 @@ impl ToComputedValue for TextEmphasisStyle {
             },
         }
     }
+
     #[inline]
     fn from_computed_value(computed: &Self::ComputedValue) -> Self {
         match *computed {
@@ -879,3 +882,24 @@ impl Parse for MozTabSize {
         )?))
     }
 }
+
+/// Values for the `overflow-wrap` property.
+#[repr(u8)]
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    Eq,
+    MallocSizeOf,
+    Parse,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+)]
+#[allow(missing_docs)]
+pub enum OverflowWrap {
+    Normal,
+    BreakWord,
+    Anywhere,
+}