Formatter line continuation awareness hooks.

pkg/analyzer/test/services/formatter_test.dart

 // Copyright (c) 2013, 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.
 
 import 'package:unittest/unittest.dart';
 
 import 'package:analyzer/src/generated/java_core.dart' show CharSequence;
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:analyzer/src/services/formatter_impl.dart';
 import 'package:analyzer/src/services/writer.dart';
@@ skipping 896 matching lines @@
                           'if (true) {\n'
                           '  print("true!");\n'
                           '} else {\n'
                           '  print("false!");\n'
                           '}');
       expectStmtFormatsTo('if (true) print("true!"); else print("false!");',
                           'if (true) print("true!"); else print("false!");',
                           transforms: false);
     });
 
+    test('line continuations - 1', () {
+      expectStmtFormatsTo(
+          'if (x &&\n'
+          '    y) {\n'
+          '  print("yes!");\n'
+          '}',
+          'if (x &&\n'
+          '    y) {\n'
+          '  print("yes!");\n'
+          '}'
+      );
+      expectStmtFormatsTo(
+          'var x =\n'
+          '    1234567890;',
+          'var x =\n'
+          '    1234567890;'
+      );
+      expectStmtFormatsTo(
+          'foo() {\n'
+          '  var x = 0;\n'
+          '  x =\n'
+          '      1234567890;\n'
+          '}',
+          'foo() {\n'
+          '  var x = 0;\n'
+          '  x =\n'
+          '      1234567890;\n'
+          '}'
+      );
+      expectStmtFormatsTo(
+          'foo() {\n'
+          '  while (true &&\n'
+          '      true) {\n'
+          '    print("!");\n'
+          '  }\n'
+          '}',
+          'foo() {\n'
+          '  while (true &&\n'
+          '      true) {\n'
+          '    print("!");\n'
+          '  }\n'
+          '}'
+      );
+      expectStmtFormatsTo(
+          'foo() {\n'
+          '  do {\n'
+          '    print("!");\n'
+          '  } while (true &&\n'
+          '      true);\n'
+          '}',
+          'foo() {\n'
+          '  do {\n'
+          '    print("!");\n'
+          '  } while (true &&\n'
+          '      true);\n'
+          '}'
+      );
+      expectStmtFormatsTo(
+          'int foo() {\n'
+          '  return\n'
+          '      foo();\n'
+          '}',
+          'int foo() {\n'
+          '  return\n'
+          '      foo();\n'
+          '}'
+      );
+      expectStmtFormatsTo(
+          'true ? foo() :\n'
+          '    bar();',
+          'true ? foo() :\n'
+          '    bar();'
+      );
+      expectCUFormatsTo(
+          'import "dart:core" as\n'
+          '    core;\n',
+          'import "dart:core" as\n'
+          '    core;\n'
+      );
+      expectCUFormatsTo(
+          'export "package:foo/foo.dart" show\n'
+          '    Foo;\n',
+          'export "package:foo/foo.dart" show\n'
+          '    Foo;\n'
+      );
+      expectCUFormatsTo(
+          'class Foo extends Bar implements\n'
+          '    Baz {\n'
+          '}\n',
+          'class Foo extends Bar implements\n'
+          '    Baz {\n'
+          '}\n'
+      );
+    });
+
     test('initialIndent', () {
       var formatter = new CodeFormatter(
           new FormatterOptions(initialIndentationLevel: 2));
       var formattedSource =
           formatter.format(CodeKind.STATEMENT, 'var x;').source;
       expect(formattedSource, startsWith('    '));
     });
 
     test('selections', () {
       expectSelectedPostFormat('class X {}', '}');
@@ skipping 221 matching lines @@
     expect(() => new TokenStreamComparator(null, t1, t2).verifyEquals(),
     throwsA(new isInstanceOf<FormatterException>()));
 
 expectCUFormatsTo(src, expected, {transforms: true}) =>
     expect(formatCU(src, options: new FormatterOptions(
         codeTransforms: transforms)).source, equals(expected));
 
 expectStmtFormatsTo(src, expected, {transforms: true}) =>
     expect(formatStatement(src, options:
       new FormatterOptions(codeTransforms: transforms)), equals(expected));