Wednesday, April 27, 2022 [Tweets] [Favorites]

AttributedString’s Codable Format

Ole Begemann:

The problem is that the character offsets that define the runs aren’t guaranteed to be stable. The definition of what constitutes a Character, i.e. a user-perceived character, or a Unicode grapheme cluster, can and does change in new Unicode versions.

[…]

The people on the Foundation team know all this, of course, and chose a better encoding format for Attributed String.

[…]

This is an array of runs, where each run consists of a text segment and a dictionary of formatting attributes. The important point is that the formatting attributes are directly associated with the text segments they belong to, not indirectly via brittle byte or character offsets.

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