| Interface | Description | 
|---|---|
| TextWidthCounter | 
 This interface abstracts the way of counting text width. | 
| Class | Description | 
|---|---|
| ASCIITextWidthCounter | 
 This implementation assumes text contains only narrow characters, | 
| CJKTextWidthCounter | 
 CJK aware TextWidthCounter implementation. | 
| MessageLocalization | 
 MessageLocalization is a helper class to provide methods for localization. | 
| PrefixPattern | 
 This object performs operations related to prefixChars of option flags. | 
| ReflectHelper | 
 This class provides helper functions related to reflection. | 
| TextHelper | 
 This class provides various helper function related to text processing. | 
| TypeNameLocalization | 
 Localization of names for argument types. | 
| Exception | Description | 
|---|---|
| HelpScreenException | 
 HelpScreenException is a subclass of ArgumentParserException. | 
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