Enable support for inline class syntax (#1185)

Author: mraleph

CHANGELOG.md

@@ -5,6 +5,7 @@
 * Format patterns and related features.
 * Format record expressions and record type annotations.
 * Format class modifiers `base`, `final`, `interface`, `mixin`, and `sealed`.
+* Format `inline class` declarations.
 * Format unnamed libraries.
 
 ## Bug fixes and style changes
@@ -20,7 +21,7 @@
 * Fix metadata test to not fail when record syntax makes whitespace between
   metadata annotation names and `(` significant ([sdk#50769][]).
 * Require Dart 2.19.
-* Require `package:analyzer` `^5.1.0`.
+* Require `package:analyzer` `^5.7.0`.
 
 [sdk#50769]: https://github.com/dart-lang/sdk/issues/50769
 
@@ -47,7 +48,7 @@
 * Don't allow a line comment in an argument list to cause preceding arguments
   to be misformatted.
 * Remove blank lines after a line comment at the end of a body.
-* Require `package:analyzer` `>=4.4.0 <6.0.0`. 
+* Require `package:analyzer` `>=4.4.0 <6.0.0`.
 
 # 2.2.3
 

lib/src/dart_formatter.dart

@@ -206,6 +206,7 @@ class DartFormatter {
     var featureSet = FeatureSet.fromEnableFlags2(
       sdkLanguageVersion: Version(2, 19, 0),
       flags: [
+        'inline-class',
         'class-modifiers',
         if (patterns) 'patterns',
         'records',

lib/src/source_visitor.dart

@@ -588,6 +588,7 @@ class SourceVisitor extends ThrowingAstVisitor {
     modifier(node.finalKeyword);
     modifier(node.sealedKeyword);
     modifier(node.mixinKeyword);
+    modifier(node.inlineKeyword);
     token(node.classKeyword);
     space();
     token(node.name);

pubspec.yaml

@@ -9,7 +9,7 @@ environment:
   sdk: ">=2.19.0 <3.0.0"
 
 dependencies:
-  analyzer: ^5.6.0
+  analyzer: ^5.7.0
   args: ">=1.0.0 <3.0.0"
   path: ^1.0.0
   pub_semver: ">=1.4.4 <3.0.0"

test/whitespace/classes.unit

@@ -243,4 +243,8 @@ base mixin class C11 = Object
 abstract mixin class C12 = Object
     with Mixin;
 abstract base mixin class C13 = Object
-    with Mixin;
+    with Mixin;
+>>> inline classes
+inline  class C {}
+<<<
+inline class C {}