Modify / shift ranges when text is edited

[ezg]

Hi all,

I have a list of ranges (IRange) that I care about and I want to updated them accordingly based on what edits have been made. Specifically:

• shift the range accordingly if text was added / removed / edited before the start of the range
• do nothing if the edit was after the range
• remove the range entirely if an edit spans the full length of the range
• split the range into two if an edit was made in the "middle" of the range
• merge ranges if they overlap / touch each other

It seems to me a lot of this functionality is probably already implemented somewhere in the Decorators code base.

I'm hoping to get pointers to the codebase where this is happening or pointers to any type of util functions that would help with this type of "math" on top of ranges.

Thanks!