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ICU 77.1: icu::Replaceable Class Reference

Replaceable is an abstract base class representing a string of characters that supports the replacement of a range of itself with a new string of characters. More...

Replaceable is an abstract base class representing a string of characters that supports the replacement of a range of itself with a new string of characters.

It is used by APIs that change a piece of text while retaining metadata. Metadata is data other than the Unicode characters returned by char32At(). One example of metadata is style attributes; another is an edit history, marking each character with an author and revision number.

An implicit aspect of the Replaceable API is that during a replace operation, new characters take on the metadata of the old characters. For example, if the string "the <b>bold</b> font" has range (4, 8) replaced with "strong", then it becomes "the <b>strong</b> font".

Replaceable specifies ranges using a start offset and a limit offset. The range of characters thus specified includes the characters at offset start..limit-1. That is, the start offset is inclusive, and the limit offset is exclusive.

Replaceable also includes API to access characters in the string: length(), charAt(), char32At(), and extractBetween().

For a subclass to support metadata, typical behavior of replace() is the following:

• Set the metadata of the new text to the metadata of the first character replaced
• If no characters are replaced, use the metadata of the previous character
• If there is no previous character (i.e. start == 0), use the following character
• If there is no following character (i.e. the replaceable was empty), use default metadata.
  
• If the code point U+FFFF is seen, it should be interpreted as a special marker having no metadata

If this is not the behavior, the subclass should document any differences.

Stable:

ICU 2.0

Definition at line 77 of file rep.h.

Replaces a substring of this object with the given text.

If the characters being replaced have metadata, the new characters that replace them should be given the same metadata.

Subclasses must ensure that if the text between start and limit is equal to the replacement text, that replace has no effect. That is, any metadata should be unaffected. In addition, subclasses are encouraged to check for initial and trailing identical characters, and make a smaller replacement if possible. This will preserve as much metadata as possible.

Parameters

start the beginning index, inclusive; 0 <= start <= limit. limit the ending index, exclusive; start <= limit <= length(). text the text to replace characters start to limit - 1

Stable:

ICU 2.0

Implemented in icu::UnicodeString.

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