This file contains the following subjects:
The ITextBoundary class implements methods for finding the location of boundaries in text. ITextBoundary is an abstract base class. Instances of ITextBoundary maintain a current position and scan over text returning the index of characters where boundaries occur.
Character boundary analysis allows users to interact with characters as they expect to, for example, when moving the cursor through a text string. Character boundary analysis provides correct navigation through strings regardless of how a character is represented. For example, an accented character might be stored as a base character and a diacritical mark, or a single combined character. What users consider to be a character can differ between languages.
Word boundary analysis is used by search and replace functions, as well as within text editing applications that allow the user to select words with a double click. Word selection provides correct interpretation of punctuation marks within and following words. Characters that are not part of a word, such as symbols or punctuation marks, have word breaks on both sides.
Line boundary analysis determines where a text string can be broken when line-wrapping. The mechanism correctly handles punctuation and hyphenated words.
Sentence boundary analysis allows selection with correct interpretation of periods within numbers and abbreviations, and trailing punctuation marks such as quotation marks and parentheses.