Move allowTrailingOptions into ArgParser.

pkg/args/test/trailing_options_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.
+
+library trailing_options_test;
+
+import 'package:unittest/unittest.dart';
+import 'package:args/args.dart';
+
+void main() {
+  test('allowTrailingOptions defaults to false', () {
+    var parser = new ArgParser();
+    expect(parser.allowTrailingOptions, isFalse);
+  });
+
+  group('when trailing options are allowed', () {
+    var parser;
+    setUp(() {
+      parser = new ArgParser(allowTrailingOptions: true);
+    });
+
+    void expectThrows(List<String> args) =>
+      expect(() => parser.parse(args), throwsFormatException,
+          reason: "with allowTrailingOptions: true");
+
+    test('collects non-options in rest', () {
+      parser.addFlag('flag');
+      parser.addOption('opt', abbr: 'o');
+      var results = parser.parse(['a', '--flag', 'b', '-o', 'value', 'c']);
+      expect(results['flag'], isTrue);
+      expect(results['opt'], equals('value'));
+      expect(results.rest, equals(['a', 'b', 'c']));
+    });
+
+    test('stops parsing options at "--"', () {
+      parser.addFlag('flag');
+      parser.addOption('opt', abbr: 'o');
+      var results = parser.parse(['a', '--flag', '--', '-ovalue', 'c']);
+      expect(results['flag'], isTrue);
+      expect(results.rest, equals(['a', '-ovalue', 'c']));
+    });
+
+    test('only consumes first "--"', () {
+      parser.addFlag('flag', abbr: 'f');
+      parser.addOption('opt', abbr: 'o');
+      var results = parser.parse(['a', '--', 'b', '--', 'c']);
+      expect(results.rest, equals(['a', 'b', '--', 'c']));
+    });
+
+    test('parses a trailing flag', () {
+      parser.addFlag('flag');
+      var results = parser.parse(['arg', '--flag']);
+
+      expect(results['flag'], isTrue);
+      expect(results.rest, equals(['arg']));
+    });
+
+    test('throws on a trailing option missing its value', () {
+      parser.addOption('opt');
+      expectThrows(['arg', '--opt']);
+    });
+
+    test('parses a trailing option', () {
+      parser.addOption('opt');
+      var results = parser.parse(['arg', '--opt', 'v']);
+      expect(results['opt'], equals('v'));
+      expect(results.rest, equals(['arg']));
+    });
+
+    test('throws on a trailing unknown flag', () {
+      expectThrows(['arg', '--xflag']);
+    });
+
+    test('throws on a trailing unknown option and value', () {
+      expectThrows(['arg', '--xopt', 'v']);
+    });
+
+    test('throws on a command', () {
+      parser.addCommand('com');
+      expectThrows(['arg', 'com']);
+    });
+  });
+
+  test("uses the innermost command's trailing options behavior", () {
+    var parser = new ArgParser(allowTrailingOptions: true);
+    parser.addFlag('flag', abbr: 'f');
+    var command = parser.addCommand('cmd',
+        new ArgParser(allowTrailingOptions: false));
+    command.addFlag('verbose', abbr: 'v');
+
+    var results = parser.parse(['a', '-f', 'b']);
+    expect(results['flag'], isTrue);
+    expect(results.rest, equals(['a', 'b']));
+
+    results = parser.parse(['cmd', '-f', 'a', '-v', '--unknown']);
+    expect(results['flag'], isTrue); // Not trailing.
+    expect(results.command['verbose'], isFalse);
+    expect(results.command.rest, equals(['a', '-v', '--unknown']));
+  });
+}