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1 library options; | |
2 | |
3 import 'package:collection/wrappers.dart'; | |
4 | |
5 /// A command-line option. Includes both flags and options which take a value. | |
6 class Option { | |
7 final String name; | |
8 final String abbreviation; | |
9 final List<String> allowed; | |
10 final defaultValue; | |
11 final Function callback; | |
12 final String help; | |
13 final String valueHelp; | |
14 final Map<String, String> allowedHelp; | |
15 final bool isFlag; | |
16 final bool negatable; | |
17 final bool allowMultiple; | |
18 final bool hide; | |
19 | |
20 Option(this.name, this.abbreviation, this.help, this.valueHelp, | |
21 List<String> allowed, Map<String, String> allowedHelp, this.defaultValue, | |
22 this.callback, {this.isFlag, this.negatable, this.allowMultiple: false, | |
23 this.hide: false}) : | |
24 this.allowed = allowed == null ? | |
25 null : new UnmodifiableListView(allowed), | |
26 this.allowedHelp = allowedHelp == null ? | |
27 null : new UnmodifiableMapView(allowedHelp) { | |
28 | |
29 if (name.isEmpty) { | |
30 throw new ArgumentError('Name cannot be empty.'); | |
31 } else if (name.startsWith('-')) { | |
32 throw new ArgumentError('Name $name cannot start with "-".'); | |
33 } | |
34 | |
35 // Ensure name does not contain any invalid characters. | |
36 if (_invalidChars.hasMatch(name)) { | |
37 throw new ArgumentError('Name "$name" contains invalid characters.'); | |
38 } | |
39 | |
40 if (abbreviation != null) { | |
41 if (abbreviation.length != 1) { | |
42 throw new ArgumentError('Abbreviation must be null or have length 1.'); | |
43 } else if(abbreviation == '-') { | |
44 throw new ArgumentError('Abbreviation cannot be "-".'); | |
45 } | |
46 | |
47 if (_invalidChars.hasMatch(abbreviation)) { | |
48 throw new ArgumentError('Abbreviation is an invalid character.'); | |
49 } | |
50 } | |
51 } | |
52 | |
53 static final _invalidChars = new RegExp(r'''[ \t\r\n"'\\/]'''); | |
54 } | |
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