[pigeon] fix int bug (#7725)

fixes https://github.com/flutter/flutter/issues/155512

packages/pigeon/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 22.4.1
+
+* [dart] Fixes bug where special handling of ints is ignored if no custom types are used.
+
 ## 22.4.0
 
 * Adds support for non-nullable types in collections.

packages/pigeon/lib/dart_generator.dart

@@ -339,44 +339,42 @@ class DartGenerator extends StructuredGenerator<DartOptions> {
     indent.write('class $_pigeonCodec extends StandardMessageCodec');
     indent.addScoped(' {', '}', () {
       indent.writeln('const $_pigeonCodec();');
-      if (enumeratedTypes.isNotEmpty) {
-        indent.writeln('@override');
-        indent.write('void writeValue(WriteBuffer buffer, Object? value) ');
-        indent.addScoped('{', '}', () {
-          indent.writeScoped('if (value is int) {', '}', () {
-            indent.writeln('buffer.putUint8(4);');
-            indent.writeln('buffer.putInt64(value);');
-          }, addTrailingNewline: false);
+      indent.writeln('@override');
+      indent.write('void writeValue(WriteBuffer buffer, Object? value) ');
+      indent.addScoped('{', '}', () {
+        indent.writeScoped('if (value is int) {', '}', () {
+          indent.writeln('buffer.putUint8(4);');
+          indent.writeln('buffer.putInt64(value);');
+        }, addTrailingNewline: false);
 
-          enumerate(enumeratedTypes,
-              (int index, final EnumeratedType customType) {
-            writeEncodeLogic(customType);
-          });
-          indent.addScoped(' else {', '}', () {
-            indent.writeln('super.writeValue(buffer, value);');
-          });
+        enumerate(enumeratedTypes,
+            (int index, final EnumeratedType customType) {
+          writeEncodeLogic(customType);
         });
-        indent.newln();
-        indent.writeln('@override');
-        indent.write('Object? readValueOfType(int type, ReadBuffer buffer) ');
+        indent.addScoped(' else {', '}', () {
+          indent.writeln('super.writeValue(buffer, value);');
+        });
+      });
+      indent.newln();
+      indent.writeln('@override');
+      indent.write('Object? readValueOfType(int type, ReadBuffer buffer) ');
+      indent.addScoped('{', '}', () {
+        indent.write('switch (type) ');
         indent.addScoped('{', '}', () {
-          indent.write('switch (type) ');
-          indent.addScoped('{', '}', () {
-            for (final EnumeratedType customType in enumeratedTypes) {
-              if (customType.enumeration < maximumCodecFieldKey) {
-                writeDecodeLogic(customType);
-              }
+          for (final EnumeratedType customType in enumeratedTypes) {
+            if (customType.enumeration < maximumCodecFieldKey) {
+              writeDecodeLogic(customType);
             }
-            if (root.requiresOverflowClass) {
-              writeDecodeLogic(overflowClass);
-            }
-            indent.writeln('default:');
-            indent.nest(1, () {
-              indent.writeln('return super.readValueOfType(type, buffer);');
-            });
+          }
+          if (root.requiresOverflowClass) {
+            writeDecodeLogic(overflowClass);
+          }
+          indent.writeln('default:');
+          indent.nest(1, () {
+            indent.writeln('return super.readValueOfType(type, buffer);');
           });
         });
-      }
+      });
     });
   }
 

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 = '22.4.0';
+const String pigeonVersion = '22.4.1';
 
 /// Read all the content from [stdin] to a String.
 String readStdin() {

packages/pigeon/platform_tests/shared_test_plugin_code/lib/src/generated/background_platform_channels.gen.dart

@@ -21,6 +21,23 @@ PlatformException _createConnectionError(String channelName) {
 
 class _PigeonCodec extends StandardMessageCodec {
   const _PigeonCodec();
+  @override
+  void writeValue(WriteBuffer buffer, Object? value) {
+    if (value is int) {
+      buffer.putUint8(4);
+      buffer.putInt64(value);
+    } else {
+      super.writeValue(buffer, value);
+    }
+  }
+
+  @override
+  Object? readValueOfType(int type, ReadBuffer buffer) {
+    switch (type) {
+      default:
+        return super.readValueOfType(type, buffer);
+    }
+  }
 }
 
 class BackgroundApi2Host {

packages/pigeon/platform_tests/shared_test_plugin_code/lib/src/generated/multiple_arity.gen.dart

@@ -32,6 +32,23 @@ List<Object?> wrapResponse(
 
 class _PigeonCodec extends StandardMessageCodec {
   const _PigeonCodec();
+  @override
+  void writeValue(WriteBuffer buffer, Object? value) {
+    if (value is int) {
+      buffer.putUint8(4);
+      buffer.putInt64(value);
+    } else {
+      super.writeValue(buffer, value);
+    }
+  }
+
+  @override
+  Object? readValueOfType(int type, ReadBuffer buffer) {
+    switch (type) {
+      default:
+        return super.readValueOfType(type, buffer);
+    }
+  }
 }
 
 class MultipleArityHostApi {

packages/pigeon/platform_tests/shared_test_plugin_code/lib/src/generated/nullable_returns.gen.dart

@@ -32,6 +32,23 @@ List<Object?> wrapResponse(
 
 class _PigeonCodec extends StandardMessageCodec {
   const _PigeonCodec();
+  @override
+  void writeValue(WriteBuffer buffer, Object? value) {
+    if (value is int) {
+      buffer.putUint8(4);
+      buffer.putInt64(value);
+    } else {
+      super.writeValue(buffer, value);
+    }
+  }
+
+  @override
+  Object? readValueOfType(int type, ReadBuffer buffer) {
+    switch (type) {
+      default:
+        return super.readValueOfType(type, buffer);
+    }
+  }
 }
 
 class NullableReturnHostApi {

packages/pigeon/platform_tests/shared_test_plugin_code/lib/src/generated/primitive.gen.dart

@@ -32,6 +32,23 @@ List<Object?> wrapResponse(
 
 class _PigeonCodec extends StandardMessageCodec {
   const _PigeonCodec();
+  @override
+  void writeValue(WriteBuffer buffer, Object? value) {
+    if (value is int) {
+      buffer.putUint8(4);
+      buffer.putInt64(value);
+    } else {
+      super.writeValue(buffer, value);
+    }
+  }
+
+  @override
+  Object? readValueOfType(int type, ReadBuffer buffer) {
+    switch (type) {
+      default:
+        return super.readValueOfType(type, buffer);
+    }
+  }
 }
 
 class PrimitiveHostApi {

packages/pigeon/pubspec.yaml

@@ -2,7 +2,7 @@ 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: 22.4.0 # This must match the version in lib/generator_tools.dart
+version: 22.4.1 # This must match the version in lib/generator_tools.dart
 
 environment:
   sdk: ^3.3.0

packages/pigeon/test/dart_generator_test.dart

@@ -1771,4 +1771,35 @@ name: foobar
     final String mainCode = mainCodeSink.toString();
     expect(mainCode, contains('List<Object?> wrapResponse('));
   });
+
+  test('writes custom int codec without custom types', () {
+    final Root root = Root(
+      apis: <Api>[
+        AstHostApi(name: 'Api', methods: <Method>[
+          Method(
+              name: 'doit',
+              location: ApiLocation.host,
+              returnType: const TypeDeclaration(
+                baseName: 'int',
+                isNullable: true,
+              ),
+              parameters: <Parameter>[])
+        ])
+      ],
+      classes: <Class>[],
+      enums: <Enum>[],
+    );
+    final StringBuffer sink = StringBuffer();
+    const DartGenerator generator = DartGenerator();
+    generator.generate(
+      const DartOptions(),
+      root,
+      sink,
+      dartPackageName: DEFAULT_PACKAGE_NAME,
+    );
+    final String code = sink.toString();
+    expect(code, contains('if (value is int) {'));
+    expect(code, contains('buffer.putUint8(4);'));
+    expect(code, contains('buffer.putInt64(value);'));
+  });
 }