fix CSS module scoping with variables

fixes #194

src/lib.rs

@@ -23672,6 +23672,99 @@ mod tests {
       },
     );
 
+    css_modules_test(
+      r#"
+      .test {
+        animation: rotate var(--duration) linear infinite;
+      }
+    "#,
+      indoc! {r#"
+      .EgL3uq_test {
+        animation: EgL3uq_rotate var(--duration) linear infinite;
+      }
+    "#},
+      map! {
+        "test" => "EgL3uq_test",
+        "rotate" => "EgL3uq_rotate" referenced: true
+      },
+      HashMap::new(),
+      Default::default(),
+    );
+    css_modules_test(
+      r#"
+      .test {
+        animation: none var(--duration);
+      }
+    "#,
+      indoc! {r#"
+      .EgL3uq_test {
+        animation: none var(--duration);
+      }
+    "#},
+      map! {
+        "test" => "EgL3uq_test"
+      },
+      HashMap::new(),
+      Default::default(),
+    );
+    css_modules_test(
+      r#"
+      .test {
+        animation: var(--animation);
+      }
+    "#,
+      indoc! {r#"
+      .EgL3uq_test {
+        animation: var(--animation);
+      }
+    "#},
+      map! {
+        "test" => "EgL3uq_test"
+      },
+      HashMap::new(),
+      Default::default(),
+    );
+    css_modules_test(
+      r#"
+      .test {
+        animation: rotate var(--duration);
+      }
+    "#,
+      indoc! {r#"
+      .EgL3uq_test {
+        animation: rotate var(--duration);
+      }
+    "#},
+      map! {
+        "test" => "EgL3uq_test"
+      },
+      HashMap::new(),
+      crate::css_modules::Config {
+        animation: false,
+        ..Default::default()
+      }
+    );
+    css_modules_test(
+      r#"
+      .test {
+        animation: "rotate" var(--duration);
+      }
+    "#,
+      indoc! {r#"
+      .EgL3uq_test {
+        animation: EgL3uq_rotate var(--duration);
+      }
+    "#},
+      map! {
+        "test" => "EgL3uq_test",
+        "rotate" => "EgL3uq_rotate" referenced: true
+      },
+      HashMap::new(),
+      crate::css_modules::Config {
+        ..Default::default()
+      }
+    );
+
     // Stable hashes between project roots.
     fn test_project_root(project_root: &str, filename: &str, hash: &str) {
       let stylesheet = StyleSheet::parse(

src/properties/animation.rs

@@ -1,12 +1,14 @@
 //! CSS properties related to keyframe animations.
 
+use std::borrow::Cow;
+
 use crate::context::PropertyHandlerContext;
 use crate::declaration::{DeclarationBlock, DeclarationList};
 use crate::error::{ParserError, PrinterError};
 use crate::macros::*;
 use crate::prefixes::Feature;
 use crate::printer::Printer;
-use crate::properties::{Property, PropertyId, VendorPrefix};
+use crate::properties::{Property, PropertyId, TokenOrValue, VendorPrefix};
 use crate::traits::{Parse, PropertyHandler, Shorthand, ToCss, Zero};
 use crate::values::number::CSSNumber;
 use crate::values::string::CowArcStr;
@@ -346,8 +348,6 @@ impl<'i> PropertyHandler<'i> for AnimationHandler<'i> {
     dest: &mut DeclarationList<'i>,
     context: &mut PropertyHandlerContext<'i, '_>,
   ) -> bool {
-    use Property::*;
-
     macro_rules! maybe_flush {
       ($prop: ident, $val: expr, $vp: ident) => {{
         // If two vendor prefixes for the same property have different
@@ -376,15 +376,15 @@ impl<'i> PropertyHandler<'i> for AnimationHandler<'i> {
     }
 
     match property {
-      AnimationName(val, vp) => property!(names, val, vp),
-      AnimationDuration(val, vp) => property!(durations, val, vp),
-      AnimationTimingFunction(val, vp) => property!(timing_functions, val, vp),
-      AnimationIterationCount(val, vp) => property!(iteration_counts, val, vp),
-      AnimationDirection(val, vp) => property!(directions, val, vp),
-      AnimationPlayState(val, vp) => property!(play_states, val, vp),
-      AnimationDelay(val, vp) => property!(delays, val, vp),
-      AnimationFillMode(val, vp) => property!(fill_modes, val, vp),
-      Animation(val, vp) => {
+      Property::AnimationName(val, vp) => property!(names, val, vp),
+      Property::AnimationDuration(val, vp) => property!(durations, val, vp),
+      Property::AnimationTimingFunction(val, vp) => property!(timing_functions, val, vp),
+      Property::AnimationIterationCount(val, vp) => property!(iteration_counts, val, vp),
+      Property::AnimationDirection(val, vp) => property!(directions, val, vp),
+      Property::AnimationPlayState(val, vp) => property!(play_states, val, vp),
+      Property::AnimationDelay(val, vp) => property!(delays, val, vp),
+      Property::AnimationFillMode(val, vp) => property!(fill_modes, val, vp),
+      Property::Animation(val, vp) => {
         let names = val.iter().map(|b| b.name.clone()).collect();
         maybe_flush!(names, &names, vp);
 
@@ -418,7 +418,33 @@ impl<'i> PropertyHandler<'i> for AnimationHandler<'i> {
         property!(delays, &delays, vp);
         property!(fill_modes, &fill_modes, vp);
       }
-      Unparsed(val) if is_animation_property(&val.property_id) => {
+      Property::Unparsed(val) if is_animation_property(&val.property_id) => {
+        let mut val = Cow::Borrowed(val);
+        if matches!(val.property_id, PropertyId::Animation(_)) {
+          use crate::properties::custom::Token;
+
+          // Find an identifier that isn't a keyword and replace it with an
+          // AnimationName token so it is scoped in CSS modules.
+          for token in &mut val.to_mut().value.0 {
+            match token {
+              TokenOrValue::Token(Token::Ident(id)) => {
+                if AnimationDirection::parse_string(&id).is_err()
+                  && AnimationPlayState::parse_string(&id).is_err()
+                  && AnimationFillMode::parse_string(&id).is_err()
+                  && !EasingFunction::is_ident(&id)
+                  && id.as_ref() != "infinite"
+                {
+                  *token = TokenOrValue::AnimationName(AnimationName::Ident(CustomIdent(id.clone())));
+                }
+              }
+              TokenOrValue::Token(Token::String(s)) => {
+                *token = TokenOrValue::AnimationName(AnimationName::String(s.clone()));
+              }
+              _ => {}
+            }
+          }
+        }
+
         self.flush(dest, context);
         dest.push(Property::Unparsed(
           val.get_prefixed(context.targets, Feature::Animation),

src/properties/custom.rs

@@ -29,6 +29,7 @@ use cssparser::*;
 
 #[cfg(feature = "serde")]
 use crate::serialization::ValueWrapper;
+use super::AnimationName;
 
 /// A CSS custom property, representing any unknown property.
 #[derive(Debug, Clone, PartialEq)]
@@ -241,6 +242,8 @@ pub enum TokenOrValue<'i> {
   Resolution(Resolution),
   /// A dashed ident.
   DashedIdent(DashedIdent<'i>),
+  /// An animation name.
+  AnimationName(AnimationName<'i>),
 }
 
 impl<'i> From<Token<'i>> for TokenOrValue<'i> {
@@ -590,6 +593,10 @@ impl<'i> TokenList<'i> {
           v.to_css(dest)?;
           false
         }
+        TokenOrValue::AnimationName(v) => {
+          v.to_css(dest)?;
+          false
+        }
         TokenOrValue::Token(token) => match token {
           Token::Delim(d) => {
             if *d == '+' || *d == '-' {