extract LabelContributor from local reference contributor

pkg/analysis_server/test/services/completion/dart/label_contributor_test.dart

Index: pkg/analysis_server/test/services/completion/dart/label_contributor_test.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/label_contributor_test.dart b/pkg/analysis_server/test/services/completion/dart/label_contributor_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2ae6644018829458576b5f47fdd0eaeb5c95ac42
--- /dev/null
+++ b/pkg/analysis_server/test/services/completion/dart/label_contributor_test.dart
@@ -0,0 +1,326 @@
+// 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 test.services.completion.contributor.dart.local_ref;
+
+import 'package:analysis_server/plugin/protocol/protocol.dart' as protocol
+    show Element, ElementKind;
+import 'package:analysis_server/plugin/protocol/protocol.dart'
+    hide Element, ElementKind;
+import 'package:analysis_server/src/protocol_server.dart';
+import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
+import 'package:analysis_server/src/services/completion/dart/label_contributor.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+import 'package:unittest/unittest.dart';
+
+import '../../../utils.dart';
+import 'completion_contributor_util.dart';
+
+main() {
+  initializeTestEnvironment();
+  defineReflectiveTests(LabelContributorTest);
+}
+
+@reflectiveTest
+class LabelContributorTest extends DartCompletionContributorTest {
+  CompletionSuggestion assertSuggestLabel(String name,
+      {int relevance: DART_RELEVANCE_DEFAULT,
+      CompletionSuggestionKind kind: CompletionSuggestionKind.IDENTIFIER}) {
+    CompletionSuggestion cs =
+        assertSuggest(name, csKind: kind, relevance: relevance);
+    expect(cs.returnType, isNull);
+    protocol.Element element = cs.element;
+    expect(element, isNotNull);
+    expect(element.flags, 0);
+    expect(element.kind, equals(protocol.ElementKind.LABEL));
+    expect(element.name, equals(name));
+    expect(element.parameters, isNull);
+    expect(element.returnType, isNull);
+    assertHasNoParameterInfo(cs);
+    return cs;
+  }
+
+  @override
+  DartCompletionContributor createContributor() {
+    return new LabelContributor();
+  }
+
+  test_break_ignores_outer_functions_using_closure() async {
+    addTestSource('''
+void main() {
+  foo: while (true) {
+    var f = () {
+      bar: while (true) { break ^ }
+    };
+  }
+}
+''');
+    await computeSuggestions();
+    // Labels in outer functions are never accessible.
+    assertSuggestLabel('bar');
+    assertNotSuggested('foo');
+  }
+
+  test_break_ignores_outer_functions_using_local_function() async {
+    addTestSource('''
+void main() {
+  foo: while (true) {
+    void f() {
+      bar: while (true) { break ^ }
+    };
+  }
+}
+''');
+    await computeSuggestions();
+    // Labels in outer functions are never accessible.
+    assertSuggestLabel('bar');
+    assertNotSuggested('foo');
+  }
+
+  test_break_ignores_toplevel_variables() async {
+    addTestSource('''
+int x;
+void main() {
+  while (true) {
+    break ^
+  }
+}
+''');
+    await computeSuggestions();
+    assertNotSuggested('x');
+  }
+
+  test_break_ignores_unrelated_statements() async {
+    addTestSource('''
+void main() {
+  foo: while (true) {}
+  while (true) { break ^ }
+  bar: while (true) {}
+}
+''');
+    await computeSuggestions();
+    // The scope of the label defined by a labeled statement is just the
+    // statement itself, so neither "foo" nor "bar" are in scope at the caret
+    // position.
+    assertNotSuggested('foo');
+    assertNotSuggested('bar');
+  }
+
+  test_break_to_enclosing_loop() async {
+    addTestSource('''
+void main() {
+  foo: while (true) {
+    bar: while (true) {
+      break ^
+    }
+  }
+}
+''');
+    await computeSuggestions();
+    assertSuggestLabel('foo');
+    assertSuggestLabel('bar');
+  }
+
+  test_continue_from_loop_to_switch() async {
+    addTestSource('''
+void main() {
+  switch (x) {
+    foo: case 1:
+      break;
+    bar: case 2:
+      while (true) {
+        continue ^;
+      }
+      break;
+    baz: case 3:
+      break;
+  }
+}
+''');
+    await computeSuggestions();
+    assertSuggestLabel('foo');
+    assertSuggestLabel('bar');
+    assertSuggestLabel('baz');
+  }
+
+  test_continue_from_switch_to_loop() async {
+    addTestSource('''
+void main() {
+  foo: while (true) {
+    switch (x) {
+      case 1:
+        continue ^;
+    }
+  }
+}
+''');
+    await computeSuggestions();
+    assertSuggestLabel('foo');
+  }
+
+  test_continue_ignores_outer_functions_using_closure_with_loop() async {
+    addTestSource('''
+void main() {
+  foo: while (true) {
+    var f = () {
+      bar: while (true) { continue ^ }
+    };
+  }
+}
+''');
+    await computeSuggestions();
+    // Labels in outer functions are never accessible.
+    assertSuggestLabel('bar');
+    assertNotSuggested('foo');
+  }
+
+  test_continue_ignores_outer_functions_using_closure_with_switch() async {
+    addTestSource('''
+void main() {
+  switch (x) {
+    foo: case 1:
+      var f = () {
+        bar: while (true) { continue ^ }
+      };
+  }
+}
+''');
+    await computeSuggestions();
+    // Labels in outer functions are never accessible.
+    assertSuggestLabel('bar');
+    assertNotSuggested('foo');
+  }
+
+  test_continue_ignores_outer_functions_using_local_function_with_loop() async {
+    addTestSource('''
+void main() {
+  foo: while (true) {
+    void f() {
+      bar: while (true) { continue ^ }
+    };
+  }
+}
+''');
+    await computeSuggestions();
+    // Labels in outer functions are never accessible.
+    assertSuggestLabel('bar');
+    assertNotSuggested('foo');
+  }
+
+  test_continue_ignores_outer_functions_using_local_function_with_switch() async {
+    addTestSource('''
+void main() {
+  switch (x) {
+    foo: case 1:
+      void f() {
+        bar: while (true) { continue ^ }
+      };
+  }
+}
+''');
+    await computeSuggestions();
+    // Labels in outer functions are never accessible.
+    assertSuggestLabel('bar');
+    assertNotSuggested('foo');
+  }
+
+  test_continue_ignores_unrelated_statements() async {
+    addTestSource('''
+void main() {
+  foo: while (true) {}
+  while (true) { continue ^ }
+  bar: while (true) {}
+}
+''');
+    await computeSuggestions();
+    // The scope of the label defined by a labeled statement is just the
+    // statement itself, so neither "foo" nor "bar" are in scope at the caret
+    // position.
+    assertNotSuggested('foo');
+    assertNotSuggested('bar');
+  }
+
+  test_continue_to_earlier_case() async {
+    addTestSource('''
+void main() {
+  switch (x) {
+    foo: case 1:
+      break;
+    case 2:
+      continue ^;
+    case 3:
+      break;
+''');
+    await computeSuggestions();
+    assertSuggestLabel('foo');
+  }
+
+  test_continue_to_enclosing_loop() async {
+    addTestSource('''
+void main() {
+  foo: while (true) {
+    bar: while (true) {
+      continue ^
+    }
+  }
+}
+''');
+    await computeSuggestions();
+    assertSuggestLabel('foo');
+    assertSuggestLabel('bar');
+  }
+
+  test_continue_to_enclosing_switch() async {
+    addTestSource('''
+void main() {
+  switch (x) {
+    foo: case 1:
+      break;
+    bar: case 2:
+      switch (y) {
+        case 1:
+          continue ^;
+      }
+      break;
+    baz: case 3:
+      break;
+  }
+}
+''');
+    await computeSuggestions();
+    assertSuggestLabel('foo');
+    assertSuggestLabel('bar');
+    assertSuggestLabel('baz');
+  }
+
+  test_continue_to_later_case() async {
+    addTestSource('''
+void main() {
+  switch (x) {
+    case 1:
+      break;
+    case 2:
+      continue ^;
+    foo: case 3:
+      break;
+''');
+    await computeSuggestions();
+    assertSuggestLabel('foo');
+  }
+
+  test_continue_to_same_case() async {
+    addTestSource('''
+void main() {
+  switch (x) {
+    case 1:
+      break;
+    foo: case 2:
+      continue ^;
+    case 3:
+      break;
+''');
+    await computeSuggestions();
+    assertSuggestLabel('foo');
+  }
+}