[pigeon] Update analyzer and formatter

Adds compatibility with the latest major version of `analyzer` and
`dart_style` (the latter being required to actually allow `analyzer` 7).

The breaking change of `dart_style` does affect our usage, so this
updates rather than expands the allowed version. The range for
`analyzer` is updated to drop versions older thas 6 since `dart_style`
doesn't allow versions older than 6 anyway.

We have to pick a language version to use for formatting; this (somewhat
arbitrarily) uses 3.6, to opt in to the new formatter.

Fixes flutter/flutter#161820
Fixes flutter/flutter#161583

packages/pigeon/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 22.7.3
+
+* Adds compatibility with `analyzer` 7.x.*.
+
 ## 22.7.2
 
 * Updates README to discuss best practices for using Pigeon-generated code.

packages/pigeon/lib/dart_generator.dart

@@ -5,6 +5,7 @@
 import 'package:code_builder/code_builder.dart' as cb;
 import 'package:dart_style/dart_style.dart';
 import 'package:path/path.dart' as path;
+import 'package:pub_semver/pub_semver.dart';
 
 import 'ast.dart';
 import 'dart/templates.dart';
@@ -779,7 +780,8 @@ final BinaryMessenger? ${varNamePrefix}binaryMessenger;
 
     final cb.DartEmitter emitter = cb.DartEmitter(useNullSafetySyntax: true);
     indent.format(
-      DartFormatter().format('${instanceManagerApi.accept(emitter)}'),
+      DartFormatter(languageVersion: Version(3, 6, 0))
+          .format('${instanceManagerApi.accept(emitter)}'),
     );
   }
 
@@ -899,7 +901,8 @@ final BinaryMessenger? ${varNamePrefix}binaryMessenger;
     );
 
     final cb.DartEmitter emitter = cb.DartEmitter(useNullSafetySyntax: true);
-    indent.format(DartFormatter().format('${proxyApi.accept(emitter)}'));
+    indent.format(DartFormatter(languageVersion: Version(3, 6, 0))
+        .format('${proxyApi.accept(emitter)}'));
   }
 
   /// Generates Dart source code for test support libraries based on the given AST

packages/pigeon/lib/generator_tools.dart

@@ -14,7 +14,7 @@ import 'ast.dart';
 /// The current version of pigeon.
 ///
 /// This must match the version in pubspec.yaml.
-const String pigeonVersion = '22.7.2';
+const String pigeonVersion = '22.7.3';
 
 /// Read all the content from [stdin] to a String.
 String readStdin() {

packages/pigeon/pubspec.yaml

@@ -2,17 +2,17 @@ name: pigeon
 description: Code generator tool to make communication between Flutter and the host platform type-safe and easier.
 repository: https://github.com/flutter/packages/tree/main/packages/pigeon
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+pigeon%22
-version: 22.7.2 # This must match the version in lib/generator_tools.dart
+version: 22.7.3 # This must match the version in lib/generator_tools.dart
 
 environment:
   sdk: ^3.4.0
 
 dependencies:
-  analyzer: ">=5.13.0 <7.0.0"
+  analyzer: ">=6.0.0 <8.0.0"
   args: ^2.1.0
   code_builder: ^4.10.0
   collection: ^1.15.0
-  dart_style: ^2.3.4
+  dart_style: ^3.0.0
   graphs: ^2.3.1
   meta: ^1.9.0
   path: ^1.8.0