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packages/args/test/parse_test.dart

Index: packages/args/test/parse_test.dart
diff --git a/packages/args/test/parse_test.dart b/packages/args/test/parse_test.dart
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+// Copyright (c) 2012, 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 parse_test;
+
+import 'package:test/test.dart';
+import 'package:args/args.dart';
+import 'utils.dart';
+
+void main() {
+  group('ArgParser.parse()', () {
+    test('does not destructively modify the argument list', () {
+      var parser = new ArgParser();
+      parser.addFlag('verbose');
+
+      var args = ['--verbose'];
+      var results = parser.parse(args);
+      expect(args, equals(['--verbose']));
+      expect(results['verbose'], isTrue);
+    });
+
+    group('flags', () {
+      test('are true if present', () {
+        var parser = new ArgParser();
+        parser.addFlag('verbose');
+
+        var args = parser.parse(['--verbose']);
+        expect(args['verbose'], isTrue);
+      });
+
+      test('default if missing', () {
+        var parser = new ArgParser();
+        parser.addFlag('a', defaultsTo: true);
+        parser.addFlag('b', defaultsTo: false);
+
+        var args = parser.parse([]);
+        expect(args['a'], isTrue);
+        expect(args['b'], isFalse);
+      });
+
+      test('are false if missing with no default', () {
+        var parser = new ArgParser();
+        parser.addFlag('verbose');
+
+        var args = parser.parse([]);
+        expect(args['verbose'], isFalse);
+      });
+
+      test('throws if given a value', () {
+        var parser = new ArgParser();
+        parser.addFlag('verbose');
+
+        throwsFormat(parser, ['--verbose=true']);
+      });
+
+      test('are case-sensitive', () {
+        var parser = new ArgParser();
+        parser.addFlag('verbose');
+        parser.addFlag('Verbose');
+        var results = parser.parse(['--verbose']);
+        expect(results['verbose'], isTrue);
+        expect(results['Verbose'], isFalse);
+      });
+    });
+
+    group('flags negated with "no-"', () {
+      test('set the flag to false', () {
+        var parser = new ArgParser();
+        parser.addFlag('verbose');
+
+        var args = parser.parse(['--no-verbose']);
+        expect(args['verbose'], isFalse);
+      });
+
+      test('set the flag to true if the flag actually starts with "no-"', () {
+        var parser = new ArgParser();
+        parser.addFlag('no-body');
+
+        var args = parser.parse(['--no-body']);
+        expect(args['no-body'], isTrue);
+      });
+
+      test('are not preferred over a colliding one without', () {
+        var parser = new ArgParser();
+        parser.addFlag('no-strum');
+        parser.addFlag('strum');
+
+        var args = parser.parse(['--no-strum']);
+        expect(args['no-strum'], isTrue);
+        expect(args['strum'], isFalse);
+      });
+
+      test('fail for non-negatable flags', () {
+        var parser = new ArgParser();
+        parser.addFlag('strum', negatable: false);
+
+        throwsFormat(parser, ['--no-strum']);
+      });
+    });
+
+    group('callbacks', () {
+      test('for present flags are invoked with the value', () {
+        var a;
+        var parser = new ArgParser();
+        parser.addFlag('a', callback: (value) => a = value);
+
+        parser.parse(['--a']);
+        expect(a, isTrue);
+      });
+
+      test('for absent flags are invoked with the default value', () {
+        var a;
+        var parser = new ArgParser();
+        parser.addFlag('a', defaultsTo: false, callback: (value) => a = value);
+
+        parser.parse([]);
+        expect(a, isFalse);
+      });
+
+      test('are invoked even if the flag is not present', () {
+        var a = 'not called';
+        var parser = new ArgParser();
+        parser.addFlag('a', callback: (value) => a = value);
+
+        parser.parse([]);
+        expect(a, isFalse);
+      });
+
+      test('for present options are invoked with the value', () {
+        var a;
+        var parser = new ArgParser();
+        parser.addOption('a', callback: (value) => a = value);
+
+        parser.parse(['--a=v']);
+        expect(a, equals('v'));
+      });
+
+      test('for absent options are invoked with the default value', () {
+        var a;
+        var parser = new ArgParser();
+        parser.addOption('a', defaultsTo: 'v', callback: (value) => a = value);
+
+        parser.parse([]);
+        expect(a, equals('v'));
+      });
+
+      test('are invoked even if the option is not present', () {
+        var a = 'not called';
+        var parser = new ArgParser();
+        parser.addOption('a', callback: (value) => a = value);
+
+        parser.parse([]);
+        expect(a, isNull);
+      });
+
+      test('for multiple present, allowMultiple, options are invoked with '
+          'value as a list', () {
+        var a;
+        var parser = new ArgParser();
+        parser.addOption('a',
+            allowMultiple: true, callback: (value) => a = value);
+
+        parser.parse(['--a=v', '--a=x']);
+        expect(a, equals(['v', 'x']));
+      });
+
+      test('for single present, allowMultiple, options are invoked with '
+          ' value as a single element list', () {
+        var a;
+        var parser = new ArgParser();
+        parser.addOption('a',
+            allowMultiple: true, callback: (value) => a = value);
+
+        parser.parse(['--a=v']);
+        expect(a, equals(['v']));
+      });
+
+      test('for absent, allowMultiple, options are invoked with default '
+          'value as a list.', () {
+        var a;
+        var parser = new ArgParser();
+        parser.addOption('a',
+            allowMultiple: true,
+            defaultsTo: 'v',
+            callback: (value) => a = value);
+
+        parser.parse([]);
+        expect(a, equals(['v']));
+      });
+
+      test('for absent, allowMultiple, options are invoked with value '
+          'as an empty list.', () {
+        var a;
+        var parser = new ArgParser();
+        parser.addOption('a',
+            allowMultiple: true, callback: (value) => a = value);
+
+        parser.parse([]);
+        expect(a, isEmpty);
+      });
+
+      test('allowMultiple parses comma-separated strings', () {
+        var a;
+        var parser = new ArgParser();
+        parser.addOption('a',
+            allowMultiple: true, callback: (value) => a = value);
+
+        parser.parse(['--a=v,w', '--a=x']);
+        expect(a, equals(['v', 'w', 'x']));
+      });
+
+      test("allowMultiple doesn't parses comma-separated strings with "
+          "splitCommas: false", () {
+        var a;
+        var parser = new ArgParser();
+        parser.addOption('a',
+            allowMultiple: true,
+            splitCommas: false,
+            callback: (value) => a = value);
+
+        parser.parse(['--a=v,w', '--a=x']);
+        expect(a, equals(['v,w', 'x']));
+      });
+
+      test('allowMultiple parses empty strings', () {
+        var a;
+        var parser = new ArgParser();
+        parser.addOption('a',
+            allowMultiple: true, callback: (value) => a = value);
+
+        parser.parse(['--a=,v', '--a=w,', '--a=,', '--a=x,,y', '--a', '']);
+        expect(a, equals(['', 'v', 'w', '', '', '', 'x', '', 'y', '']));
+      });
+
+      test('allowMultiple with allowed parses comma-separated strings', () {
+        var a;
+        var parser = new ArgParser();
+        parser.addOption('a',
+            allowMultiple: true,
+            allowed: ['v', 'w', 'x'],
+            callback: (value) => a = value);
+
+        parser.parse(['--a=v,w', '--a=x']);
+        expect(a, equals(['v', 'w', 'x']));
+      });
+    });
+
+    group('abbreviations', () {
+      test('are parsed with a preceding "-"', () {
+        var parser = new ArgParser();
+        parser.addFlag('arg', abbr: 'a');
+
+        var args = parser.parse(['-a']);
+        expect(args['arg'], isTrue);
+      });
+
+      test('can use multiple after a single "-"', () {
+        var parser = new ArgParser();
+        parser.addFlag('first', abbr: 'f');
+        parser.addFlag('second', abbr: 's');
+        parser.addFlag('third', abbr: 't');
+
+        var args = parser.parse(['-tf']);
+        expect(args['first'], isTrue);
+        expect(args['second'], isFalse);
+        expect(args['third'], isTrue);
+      });
+
+      test('can have multiple "-" args', () {
+        var parser = new ArgParser();
+        parser.addFlag('first', abbr: 'f');
+        parser.addFlag('second', abbr: 's');
+        parser.addFlag('third', abbr: 't');
+
+        var args = parser.parse(['-s', '-tf']);
+        expect(args['first'], isTrue);
+        expect(args['second'], isTrue);
+        expect(args['third'], isTrue);
+      });
+
+      test('can take arguments without a space separating', () {
+        var parser = new ArgParser();
+        parser.addOption('file', abbr: 'f');
+
+        var args = parser.parse(['-flip']);
+        expect(args['file'], equals('lip'));
+      });
+
+      test('can take arguments with a space separating', () {
+        var parser = new ArgParser();
+        parser.addOption('file', abbr: 'f');
+
+        var args = parser.parse(['-f', 'name']);
+        expect(args['file'], equals('name'));
+      });
+
+      test('allow non-option characters in the value', () {
+        var parser = new ArgParser();
+        parser.addOption('apple', abbr: 'a');
+
+        var args = parser.parse(['-ab?!c']);
+        expect(args['apple'], equals('b?!c'));
+      });
+
+      test('throw if unknown', () {
+        var parser = new ArgParser();
+        throwsFormat(parser, ['-f']);
+      });
+
+      test('throw if the value is missing', () {
+        var parser = new ArgParser();
+        parser.addOption('file', abbr: 'f');
+
+        throwsFormat(parser, ['-f']);
+      });
+
+      test('does not throw if the value looks like an option', () {
+        var parser = new ArgParser();
+        parser.addOption('file', abbr: 'f');
+        parser.addOption('other');
+
+        expect(parser.parse(['-f', '--other'])['file'], equals('--other'));
+        expect(parser.parse(['-f', '--unknown'])['file'], equals('--unknown'));
+        expect(parser.parse(['-f', '-abbr'])['file'], equals('-abbr'));
+        expect(parser.parse(['-f', '--'])['file'], equals('--'));
+      });
+
+      test('throw if the value is not allowed', () {
+        var parser = new ArgParser();
+        parser.addOption('mode', abbr: 'm', allowed: ['debug', 'release']);
+
+        throwsFormat(parser, ['-mprofile']);
+      });
+
+      test('throw if a comma-separated value is not allowed', () {
+        var parser = new ArgParser();
+        parser.addOption('mode', abbr: 'm', allowMultiple: true,
+            allowed: ['debug', 'release']);
+
+        throwsFormat(parser, ['-mdebug,profile']);
+      });
+
+      test('throw if any but the first is not a flag', () {
+        var parser = new ArgParser();
+        parser.addFlag('apple', abbr: 'a');
+        parser.addOption('banana', abbr: 'b'); // Takes an argument.
+        parser.addFlag('cherry', abbr: 'c');
+
+        throwsFormat(parser, ['-abc']);
+      });
+
+      test('throw if it has a value but the option is a flag', () {
+        var parser = new ArgParser();
+        parser.addFlag('apple', abbr: 'a');
+        parser.addFlag('banana', abbr: 'b');
+
+        // The '?!' means this can only be understood as '--apple b?!c'.
+        throwsFormat(parser, ['-ab?!c']);
+      });
+
+      test('are case-sensitive', () {
+        var parser = new ArgParser();
+        parser.addFlag('file', abbr: 'f');
+        parser.addFlag('force', abbr: 'F');
+        var results = parser.parse(['-f']);
+        expect(results['file'], isTrue);
+        expect(results['force'], isFalse);
+      });
+    });
+
+    group('options', () {
+      test('are parsed if present', () {
+        var parser = new ArgParser();
+        parser.addOption('mode');
+        var args = parser.parse(['--mode=release']);
+        expect(args['mode'], equals('release'));
+      });
+
+      test('are null if not present', () {
+        var parser = new ArgParser();
+        parser.addOption('mode');
+        var args = parser.parse([]);
+        expect(args['mode'], isNull);
+      });
+
+      test('default if missing', () {
+        var parser = new ArgParser();
+        parser.addOption('mode', defaultsTo: 'debug');
+        var args = parser.parse([]);
+        expect(args['mode'], equals('debug'));
+      });
+
+      test('allow the value to be separated by whitespace', () {
+        var parser = new ArgParser();
+        parser.addOption('mode');
+        var args = parser.parse(['--mode', 'release']);
+        expect(args['mode'], equals('release'));
+      });
+
+      test('throw if unknown', () {
+        var parser = new ArgParser();
+        throwsFormat(parser, ['--unknown']);
+        throwsFormat(parser, ['--nobody']); // Starts with "no".
+      });
+
+      test('throw if the arg does not include a value', () {
+        var parser = new ArgParser();
+        parser.addOption('mode');
+        throwsFormat(parser, ['--mode']);
+      });
+
+      test('do not throw if the value looks like an option', () {
+        var parser = new ArgParser();
+        parser.addOption('mode');
+        parser.addOption('other');
+
+        expect(parser.parse(['--mode', '--other'])['mode'], equals('--other'));
+        expect(parser.parse(['--mode', '--unknown'])['mode'],
+            equals('--unknown'));
+        expect(parser.parse(['--mode', '-abbr'])['mode'], equals('-abbr'));
+        expect(parser.parse(['--mode', '--'])['mode'], equals('--'));
+      });
+
+      test('do not throw if the value is in the allowed set', () {
+        var parser = new ArgParser();
+        parser.addOption('mode', allowed: ['debug', 'release']);
+        var args = parser.parse(['--mode=debug']);
+        expect(args['mode'], equals('debug'));
+      });
+
+      test('throw if the value is not in the allowed set', () {
+        var parser = new ArgParser();
+        parser.addOption('mode', allowed: ['debug', 'release']);
+        throwsFormat(parser, ['--mode=profile']);
+      });
+
+      test('returns last provided value', () {
+        var parser = new ArgParser();
+        parser.addOption('define');
+        var args = parser.parse(['--define=1', '--define=2']);
+        expect(args['define'], equals('2'));
+      });
+
+      test('returns a List if multi-valued', () {
+        var parser = new ArgParser();
+        parser.addOption('define', allowMultiple: true);
+        var args = parser.parse(['--define=1']);
+        expect(args['define'], equals(['1']));
+        args = parser.parse(['--define=1', '--define=2']);
+        expect(args['define'], equals(['1', '2']));
+      });
+
+      test('returns the default value for multi-valued arguments '
+          'if not explicitly set', () {
+        var parser = new ArgParser();
+        parser.addOption('define', defaultsTo: '0', allowMultiple: true);
+        var args = parser.parse(['']);
+        expect(args['define'], equals(['0']));
+      });
+
+      test('are case-sensitive', () {
+        var parser = new ArgParser();
+        parser.addOption('verbose', defaultsTo: 'no');
+        parser.addOption('Verbose', defaultsTo: 'no');
+        var results = parser.parse(['--verbose', 'chatty']);
+        expect(results['verbose'], equals('chatty'));
+        expect(results['Verbose'], equals('no'));
+      });
+    });
+
+    group('remaining args', () {
+      test('stops parsing args when a non-option-like arg is encountered', () {
+        var parser = new ArgParser();
+        parser.addFlag('woof');
+        parser.addOption('meow');
+        parser.addOption('tweet', defaultsTo: 'bird');
+
+        var results = parser.parse(['--woof', '--meow', 'v', 'not', 'option']);
+        expect(results['woof'], isTrue);
+        expect(results['meow'], equals('v'));
+        expect(results['tweet'], equals('bird'));
+        expect(results.rest, equals(['not', 'option']));
+      });
+
+      test('consumes "--" and stops', () {
+        var parser = new ArgParser();
+        parser.addFlag('woof', defaultsTo: false);
+        parser.addOption('meow', defaultsTo: 'kitty');
+
+        var results = parser.parse(['--woof', '--', '--meow']);
+        expect(results['woof'], isTrue);
+        expect(results['meow'], equals('kitty'));
+        expect(results.rest, equals(['--meow']));
+      });
+
+      test('leaves "--" if not the first non-option', () {
+        var parser = new ArgParser();
+        parser.addFlag('woof');
+
+        var results = parser.parse(['--woof', 'stop', '--', 'arg']);
+        expect(results['woof'], isTrue);
+        expect(results.rest, equals(['stop', '--', 'arg']));
+      });
+    });
+  });
+}