Add utilities for creating SourceChanges

pkg/analysis_server/test/src/utilities/change_builder_dart_test.dart

Index: pkg/analysis_server/test/src/utilities/change_builder_dart_test.dart
diff --git a/pkg/analysis_server/test/src/utilities/change_builder_dart_test.dart b/pkg/analysis_server/test/src/utilities/change_builder_dart_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..8561850e79a87197a9992d700d22b07a46368167
--- /dev/null
+++ b/pkg/analysis_server/test/src/utilities/change_builder_dart_test.dart
@@ -0,0 +1,438 @@
+// Copyright (c) 2015, 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 analysis_server.test.src.utilities.change_builder_dart_test;
+
+import 'package:analysis_server/src/protocol.dart';
+import 'package:analysis_server/src/utilities/change_builder_core.dart';
+import 'package:analysis_server/src/utilities/change_builder_dart.dart';
+import 'package:analysis_server/utilities/change_builder_core.dart';
+import 'package:analysis_server/utilities/change_builder_dart.dart';
+import 'package:analyzer/src/generated/ast.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+import 'package:unittest/unittest.dart';
+
+import '../../abstract_context.dart';
+import '../../domain_execution_test.dart';
+
+main() {
+  groupSep = ' | ';
+  defineReflectiveTests(DartChangeBuilderImplTest);
+  defineReflectiveTests(DartEditBuilderImplTest);
+  defineReflectiveTests(DartFileEditBuilderImplTest);
+}
+
+@reflectiveTest
+class DartChangeBuilderImplTest extends AbstractContextTest {
+  void test_createFileEditBuilder() {
+    Source source = addSource('/test.dart', 'library test;');
+    resolveLibraryUnit(source);
+    int timeStamp = 54;
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    DartFileEditBuilderImpl fileEditBuilder =
+        builder.createFileEditBuilder(source, timeStamp);
+    expect(fileEditBuilder, new isInstanceOf<DartFileEditBuilder>());
+    SourceFileEdit fileEdit = fileEditBuilder.fileEdit;
+    expect(fileEdit.file, source.fullName);
+    expect(fileEdit.fileStamp, timeStamp);
+  }
+}
+
+@reflectiveTest
+class DartEditBuilderImplTest extends AbstractContextTest {
+  SourceEdit getEdit(DartChangeBuilderImpl builder) {
+    SourceChange sourceChange = builder.sourceChange;
+    expect(sourceChange, isNotNull);
+    List<SourceFileEdit> fileEdits = sourceChange.edits;
+    expect(fileEdits, hasLength(1));
+    SourceFileEdit fileEdit = fileEdits[0];
+    expect(fileEdit, isNotNull);
+    List<SourceEdit> edits = fileEdit.edits;
+    expect(edits, hasLength(1));
+    return edits[0];
+  }
+
+  void test_writeClassDeclaration_isAbstract() {
+    Source source = addSource('/test.dart', '');
+    resolveLibraryUnit(source);
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(0, (DartEditBuilder builder) {
+        builder.writeClassDeclaration('C', isAbstract: true);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('abstract class C { }'));
+  }
+
+  void test_writeClassDeclaration_nameOnly() {
+    Source source = addSource('/test.dart', '');
+    resolveLibraryUnit(source);
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(0, (DartEditBuilder builder) {
+        builder.writeClassDeclaration('C');
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('class C { }'));
+
+    List<LinkedEditGroup> linkedEditGroups =
+        builder.sourceChange.linkedEditGroups;
+    expect(linkedEditGroups, hasLength(1));
+    LinkedEditGroup group = linkedEditGroups[0];
+    expect(group.length, 1);
+    expect(group.positions, hasLength(1));
+  }
+
+  void test_writeClassDeclaration_superclass() {
+    Source source = addSource('/test.dart', 'class B {}');
+    CompilationUnit unit = resolveLibraryUnit(source);
+    ClassDeclaration declaration = unit.declarations[0];
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(0, (DartEditBuilder builder) {
+        builder.writeClassDeclaration('C',
+            superclass: declaration.element.type);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('class C extends B { }'));
+  }
+
+  void test_writeOverrideOfInheritedMember() {
+    String content = '''
+class A {
+  A add(A a) => null;
+}
+class B extends A {
+}''';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    ClassDeclaration declaration = unit.declarations[0];
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeOverrideOfInheritedMember(declaration.element.methods[0]);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('''
+@override
+A add(A a) {
+  // TODO: implement add
+  return null;
+}'''));
+  }
+
+  void test_writeParameters_named() {
+    String content = 'f(int i, {String s}) {}';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    FunctionDeclaration f = unit.declarations[0];
+    FormalParameterList parameters = f.functionExpression.parameters;
+    Iterable elements = parameters.parameters
+        .map((FormalParameter parameter) => parameter.element);
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeParameters(elements);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('(int i, {String s})'));
+  }
+
+  void test_writeParameters_positional() {
+    String content = 'f(int i, [String s]) {}';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    FunctionDeclaration f = unit.declarations[0];
+    FormalParameterList parameters = f.functionExpression.parameters;
+    Iterable elements = parameters.parameters
+        .map((FormalParameter parameter) => parameter.element);
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeParameters(elements);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('(int i, [String s])'));
+  }
+
+  void test_writeParameters_required() {
+    String content = 'f(int i, String s) {}';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    FunctionDeclaration f = unit.declarations[0];
+    FormalParameterList parameters = f.functionExpression.parameters;
+    Iterable elements = parameters.parameters
+        .map((FormalParameter parameter) => parameter.element);
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeParameters(elements);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('(int i, String s)'));
+  }
+
+  void test_writeParametersMatchingArguments_named() {
+    String content = '''
+f(int i, String s) {
+  g(s, index: i);
+}''';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    FunctionDeclaration f = unit.declarations[0];
+    BlockFunctionBody body = f.functionExpression.body;
+    ExpressionStatement statement = body.block.statements[0];
+    MethodInvocation invocation = statement.expression;
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeParametersMatchingArguments(invocation.argumentList);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(
+        edit.replacement, equalsIgnoringWhitespace('(String s, [int index])'));
+  }
+
+  void test_writeParametersMatchingArguments_required() {
+    String content = '''
+f(int i, String s) {
+  g(s, i);
+}''';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    FunctionDeclaration f = unit.declarations[0];
+    BlockFunctionBody body = f.functionExpression.body;
+    ExpressionStatement statement = body.block.statements[0];
+    MethodInvocation invocation = statement.expression;
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeParametersMatchingArguments(invocation.argumentList);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('(String s, int i)'));
+  }
+
+  void test_writeParameterSource() {
+    String content = 'class A {}';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    ClassDeclaration classA = unit.declarations[0];
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeParameterSource(classA.element.type, 'a');
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('A a'));
+  }
+
+  void test_writeType_dymanic() {
+    String content = 'class A {}';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeType(unit.element.context.typeProvider.dynamicType);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace(''));
+  }
+
+  void test_writeType_genericType() {
+    String content = 'class A {} class B<E> {}';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    ClassDeclaration classA = unit.declarations[0];
+    ClassDeclaration classB = unit.declarations[1];
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder
+            .writeType(classB.element.type.substitute4([classA.element.type]));
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('B<A>'));
+  }
+
+  void test_writeType_groupName() {
+    String content = 'class A {} class B extends A {} class C extends B {}';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    ClassDeclaration classC = unit.declarations[2];
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeType(classC.element.type, groupName: 'type');
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('C'));
+
+    List<LinkedEditGroup> linkedEditGroups =
+        builder.sourceChange.linkedEditGroups;
+    expect(linkedEditGroups, hasLength(1));
+    LinkedEditGroup group = linkedEditGroups[0];
+    expect(group, isNotNull);
+  }
+
+  void test_writeType_groupName_addSupertypeProposals() {
+    String content = 'class A {} class B extends A {} class C extends B {}';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    ClassDeclaration classC = unit.declarations[2];
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeType(classC.element.type,
+            addSupertypeProposals: true, groupName: 'type');
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('C'));
+
+    List<LinkedEditGroup> linkedEditGroups =
+        builder.sourceChange.linkedEditGroups;
+    expect(linkedEditGroups, hasLength(1));
+    LinkedEditGroup group = linkedEditGroups[0];
+    List<LinkedEditSuggestion> suggestions = group.suggestions;
+    expect(suggestions, hasLength(4));
+    Iterable<String> values = suggestions
+        .map((LinkedEditSuggestion suggestion) {
+      expect(suggestion.kind, LinkedEditSuggestionKind.TYPE);
+      return suggestion.value;
+    });
+    expect(values, contains('Object'));
+    expect(values, contains('A'));
+    expect(values, contains('B'));
+    expect(values, contains('C'));
+  }
+
+  void test_writeType_null() {
+    String content = 'class A {}';
+    Source source = addSource('/test.dart', content);
+    resolveLibraryUnit(source);
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeType(null);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace(''));
+  }
+
+  void test_writeType_required_dymanic() {
+    String content = 'class A {}';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeType(unit.element.context.typeProvider.dynamicType,
+            required: true);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('var'));
+  }
+
+  void test_writeType_required_notNull() {
+    String content = 'class A {}';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    ClassDeclaration classA = unit.declarations[0];
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeType(classA.element.type, required: true);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('A'));
+  }
+
+  void test_writeType_required_null() {
+    String content = 'class A {}';
+    Source source = addSource('/test.dart', content);
+    resolveLibraryUnit(source);
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeType(null, required: true);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('var'));
+  }
+
+  void test_writeType_simpleType() {
+    String content = 'class A {}';
+    Source source = addSource('/test.dart', content);
+    CompilationUnit unit = resolveLibraryUnit(source);
+    ClassDeclaration classA = unit.declarations[0];
+
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, 1, (DartFileEditBuilderImpl builder) {
+      builder.addInsertion(content.length - 1, (DartEditBuilder builder) {
+        builder.writeType(classA.element.type);
+      });
+    });
+    SourceEdit edit = getEdit(builder);
+    expect(edit.replacement, equalsIgnoringWhitespace('A'));
+  }
+}
+
+@reflectiveTest
+class DartFileEditBuilderImplTest extends AbstractContextTest {
+  void test_createEditBuilder() {
+    Source source = addSource('/test.dart', 'library test;');
+    resolveLibraryUnit(source);
+    int timeStamp = 65;
+    DartChangeBuilderImpl builder = new DartChangeBuilderImpl(context);
+    builder.addFileEdit(source, timeStamp, (DartFileEditBuilderImpl builder) {
+      int offset = 4;
+      int length = 5;
+      DartEditBuilderImpl editBuilder =
+          builder.createEditBuilder(offset, length);
+      expect(editBuilder, new isInstanceOf<DartEditBuilder>());
+      SourceEdit sourceEdit = editBuilder.sourceEdit;
+      expect(sourceEdit.length, length);
+      expect(sourceEdit.offset, offset);
+      expect(sourceEdit.replacement, isEmpty);
+    });
+  }
+}