Initial flat buffers implementation.

pkg/analyzer/test/src/summary/flat_buffers_test.dart

+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library test.src.summary.flat_buffers_test;
+
+import 'package:analyzer/src/summary/flat_buffers.dart';
+import 'package:unittest/unittest.dart';
+
+import '../../reflective_tests.dart';
+
+main() {
+  groupSep = ' | ';
+  runReflectiveTests(BuilderTest);
+}
+
+@reflectiveTest
+class BuilderTest {
+  void test_error_addInt32_withoutStartTable() {
+    Builder builder = new Builder();
+    expect(() {
+      builder.addInt32(0, 0);
+    }, throwsStateError);
+  }
+
+  void test_error_addOffset_withoutStartTable() {
+    Builder builder = new Builder();
+    expect(() {
+      builder.addOffset(0, new Offset(0));
+    }, throwsStateError);
+  }
+
+  void test_error_endTable_withoutStartTable() {
+    Builder builder = new Builder();
+    expect(() {
+      builder.endTable();
+    }, throwsStateError);
+  }
+
+  void test_error_startTable_duringTable() {
+    Builder builder = new Builder();
+    builder.startTable();
+    expect(() {
+      builder.startTable();
+    }, throwsStateError);
+  }
+
+  void test_error_writeString_duringTable() {
+    Builder builder = new Builder();
+    builder.startTable();
+    expect(() {
+      builder.writeString('12345');
+    }, throwsStateError);
+  }
+
+  void test_low() {
+    Builder builder = new Builder(initialSize: 0);
+    builder.lowReset();
+    expect((builder..lowWriteUint8(1)).lowFinish(), [1]);
+    expect((builder..lowWriteUint32(2)).lowFinish(), [2, 0, 0, 0, 0, 0, 0, 1]);
+    expect((builder..lowWriteUint8(3)).lowFinish(),
+        [0, 0, 0, 3, 2, 0, 0, 0, 0, 0, 0, 1]);
+    expect((builder..lowWriteUint8(4)).lowFinish(),
+        [0, 0, 4, 3, 2, 0, 0, 0, 0, 0, 0, 1]);
+    expect((builder..lowWriteUint8(5)).lowFinish(),
+        [0, 5, 4, 3, 2, 0, 0, 0, 0, 0, 0, 1]);
+    expect((builder..lowWriteUint32(6)).lowFinish(),
+        [6, 0, 0, 0, 0, 5, 4, 3, 2, 0, 0, 0, 0, 0, 0, 1]);
+  }
+
+  void test_table_default() {
+    List<int> byteList;
+    {
+      Builder builder = new Builder(initialSize: 0);
+      builder.startTable();
+      builder.addInt32(0, 10, 10);
+      builder.addInt32(1, 20, 10);
+      Offset offset = builder.endTable();
+      byteList = builder.finish(offset);
+    }
+    // read and verify
+    BufferPointer object = new BufferPointer.fromBytes(byteList).derefObject();
+    // was not written, so uses the new default value
+    expect(const Int32Reader().vTableGet(object, 0, 15), 15);
+    // has the written value
+    expect(const Int32Reader().vTableGet(object, 1, 15), 20);
+  }
+
+  void test_table_types() {
+    List<int> byteList;
+    {
+      Builder builder = new Builder(initialSize: 0);
+      Offset<String> stringOffset = builder.writeString('12345');
+      builder.startTable();
+      builder.addInt8(0, 10);
+      builder.addInt32(1, 20);
+      builder.addOffset(2, stringOffset);
+      builder.addInt32(3, 40);
+      Offset offset = builder.endTable();
+      byteList = builder.finish(offset);
+    }
+    // read and verify
+    BufferPointer object = new BufferPointer.fromBytes(byteList).derefObject();
+    expect(const Int8Reader().vTableGet(object, 0), 10);
+    expect(const Int32Reader().vTableGet(object, 1), 20);
+    expect(const StringReader().vTableGet(object, 2), '12345');
+    expect(const Int32Reader().vTableGet(object, 3), 40);
+  }
+
+  void test_writeList_ofObjects() {
+    List<int> byteList;
+    {
+      Builder builder = new Builder(initialSize: 0);
+      // write the object #1
+      Offset object1;
+      {
+        builder.startTable();
+        builder.addInt32(0, 10);
+        builder.addInt32(1, 20);
+        object1 = builder.endTable();
+      }
+      // write the object #1
+      Offset object2;
+      {
+        builder.startTable();
+        builder.addInt32(0, 100);
+        builder.addInt32(1, 200);
+        object2 = builder.endTable();
+      }
+      // write the line
+      Offset offset = builder.writeList([object1, object2]);
+      byteList = builder.finish(offset);
+    }
+    // read and verify
+    BufferPointer root = new BufferPointer.fromBytes(byteList);
+    List<TestPointReader> items =
+        const ListReader<TestPointReader>(const TestPointReader()).read(root);
+    expect(items, hasLength(2));
+    expect(items[0].x, 10);
+    expect(items[0].y, 20);
+    expect(items[1].x, 100);
+    expect(items[1].y, 200);
+  }
+
+  void test_writeList_ofStrings_asRoot() {
+    List<int> byteList;
+    {
+      Builder builder = new Builder(initialSize: 0);
+      Offset<String> str1 = builder.writeString('12345');
+      Offset<String> str2 = builder.writeString('ABC');
+      Offset offset = builder.writeList([str1, str2]);
+      byteList = builder.finish(offset);
+    }
+    // read and verify
+    BufferPointer root = new BufferPointer.fromBytes(byteList);
+    List<String> items =
+        const ListReader<String>(const StringReader()).read(root);
+    expect(items, hasLength(2));
+    expect(items, contains('12345'));
+    expect(items, contains('ABC'));
+  }
+
+  void test_writeList_ofStrings_inObject() {
+    List<int> byteList;
+    {
+      Builder builder = new Builder(initialSize: 0);
+      Offset listOffset = builder.writeList(
+          [builder.writeString('12345'), builder.writeString('ABC')]);
+      builder.startTable();
+      builder.addOffset(0, listOffset);
+      Offset offset = builder.endTable();
+      byteList = builder.finish(offset);
+    }
+    // read and verify
+    BufferPointer root = new BufferPointer.fromBytes(byteList);
+    StringListWrapperReader reader = new StringListWrapperReader().read(root);
+    List<String> items = reader.items;
+    expect(items, hasLength(2));
+    expect(items, contains('12345'));
+    expect(items, contains('ABC'));
+  }
+}
+
+class StringListWrapperReader extends TableReader<StringListWrapperReader> {
+  final BufferPointer bp;
+
+  const StringListWrapperReader() : bp = null;
+
+  StringListWrapperReader._(this.bp);
+
+  List<String> get items =>
+      const ListReader<String>(const StringReader()).vTableGet(bp, 0);
+
+  @override
+  StringListWrapperReader createReader(BufferPointer object) {
+    return new StringListWrapperReader._(object);
+  }
+}
+
+class TestPointReader extends TableReader<TestPointReader> {
+  final BufferPointer bp;
+
+  const TestPointReader() : bp = null;
+
+  TestPointReader._(this.bp);
+
+  int get x => const Int32Reader().vTableGet(bp, 0, 0);
+
+  int get y => const Int32Reader().vTableGet(bp, 1, 0);
+
+  @override
+  TestPointReader createReader(BufferPointer object) {
+    return new TestPointReader._(object);
+  }
+}