Support empty custom properties

CHANGELOG.md

@@ -1,4 +1,6 @@
-## 1.88.0-dev
+## 1.88.0
+
+* Allow custom properties with empty values (such as `--var:;`).
 
 * Fix a bug when calculating source spans for interpolations.
 

lib/src/parse/stylesheet.dart

@@ -412,7 +412,9 @@ abstract class StylesheetParser extends Parser {
     var name = nameBuffer.interpolation(scanner.spanFrom(start, beforeColon));
     if (name.initialPlain.startsWith('--')) {
       var value = StringExpression(
-        _interpolatedDeclarationValue(silentComments: false),
+        atEndOfStatement()
+            ? Interpolation(const [], const [], scanner.emptySpan)
+            : _interpolatedDeclarationValue(silentComments: false),
       );
       expectStatementSeparator("custom property");
       return Declaration(name, value, scanner.spanFrom(start));

lib/src/visitor/async_evaluate.dart

@@ -1381,9 +1381,12 @@ final class _EvaluateVisitor
 
     if (node.value case var expression?) {
       var value = await expression.accept(this);
-      // If the value is an empty list, preserve it, because converting it to CSS
-      // will throw an error that we want the user to see.
-      if (!value.isBlank || _isEmptyList(value)) {
+      if (!value.isBlank ||
+          // If the value is an empty list, preserve it, because converting it
+          // to CSS will throw an error that we want the user to see.
+          _isEmptyList(value) ||
+          // Custom properties are allowed to have empty values, per spec.
+          name.value.startsWith('--')) {
         _parent.addChild(
           ModifiableCssDeclaration(
             name,
@@ -1396,11 +1399,6 @@ final class _EvaluateVisitor
                 _sourceMap ? node.value.andThen(_expressionNode)?.span : null,
           ),
         );
-      } else if (name.value.startsWith('--')) {
-        throw _exception(
-          "Custom property values may not be empty.",
-          expression.span,
-        );
       }
     }
 

lib/src/visitor/evaluate.dart

@@ -5,7 +5,7 @@
 // DO NOT EDIT. This file was generated from async_evaluate.dart.
 // See tool/grind/synchronize.dart for details.
 //
-// Checksum: 6e5710daa106ed0b9b684af8bc61ce9cc233a10b
+// Checksum: a3068d04660dd2bed34b884aa6e1a21d423dc4e5
 //
 // ignore_for_file: unused_import
 
@@ -1389,9 +1389,12 @@ final class _EvaluateVisitor
 
     if (node.value case var expression?) {
       var value = expression.accept(this);
-      // If the value is an empty list, preserve it, because converting it to CSS
-      // will throw an error that we want the user to see.
-      if (!value.isBlank || _isEmptyList(value)) {
+      if (!value.isBlank ||
+          // If the value is an empty list, preserve it, because converting it
+          // to CSS will throw an error that we want the user to see.
+          _isEmptyList(value) ||
+          // Custom properties are allowed to have empty values, per spec.
+          name.value.startsWith('--')) {
         _parent.addChild(
           ModifiableCssDeclaration(
             name,
@@ -1404,11 +1407,6 @@ final class _EvaluateVisitor
                 _sourceMap ? node.value.andThen(_expressionNode)?.span : null,
           ),
         );
-      } else if (name.value.startsWith('--')) {
-        throw _exception(
-          "Custom property values may not be empty.",
-          expression.span,
-        );
       }
     }
 

pkg/sass-parser/CHANGELOG.md

@@ -1,4 +1,4 @@
-## 0.4.21-dev
+## 0.4.21
 
 * No user-visible changes.
 

pkg/sass-parser/package.json

@@ -1,6 +1,6 @@
 {
   "name": "sass-parser",
-  "version": "0.4.21-dev",
+  "version": "0.4.21",
   "description": "A PostCSS-compatible wrapper of the official Sass parser",
   "repository": "sass/sass",
   "author": "Google Inc.",

pkg/sass_api/CHANGELOG.md

@@ -1,4 +1,4 @@
-## 15.5.0-dev
+## 15.5.0
 
 * No user-visible changes.
 

pkg/sass_api/pubspec.yaml

@@ -2,7 +2,7 @@ name: sass_api
 # Note: Every time we add a new Sass AST node, we need to bump the *major*
 # version because it's a breaking change for anyone who's implementing the
 # visitor interface(s).
-version: 15.5.0-dev
+version: 15.5.0
 description: Additional APIs for Dart Sass.
 homepage: https://github.com/sass/dart-sass
 

pubspec.yaml

@@ -1,5 +1,5 @@
 name: sass
-version: 1.88.0-dev
+version: 1.88.0
 description: A Sass implementation in Dart.
 homepage: https://github.com/sass/dart-sass
 

tool/grind/bump_version.dart

@@ -17,6 +17,9 @@ final _pubspecVersionRegExp = RegExp(r'^version: (.*)$', multiLine: true);
 /// A regular expression that matches a Sass dependency version in a pubspec.
 final _sassVersionRegExp = RegExp(r'^( +)sass: (\d.*)$', multiLine: true);
 
+/// A regular expression that matches a CHANGELOG header for a dev version
+final _changelogDevHeaderRegExp = RegExp(r'^## .*-dev$', multiLine: true);
+
 /// Adds grinder tasks for bumping package versions.
 void addBumpVersionTasks() {
   for (var patch in [false, true]) {
@@ -65,9 +68,9 @@ void _bumpVersion(bool patch, bool dev) {
   void addChangelogEntry(String dir, Version version) {
     var path = p.join(dir, "CHANGELOG.md");
     var text = File(path).readAsStringSync();
-    if (!dev && text.startsWith("## $version-dev\n")) {
+    if (!dev && text.startsWith(_changelogDevHeaderRegExp)) {
       File(path).writeAsStringSync(
-        text.replaceFirst("## $version-dev\n", "## $version\n"),
+        text.replaceFirst(_changelogDevHeaderRegExp, "## $version"),
       );
     } else if (text.startsWith("## $version\n")) {
       return;