get character ranges for selection recursively, to add support for recursive ranges like "word 3 of paragraph 2".
get character ranges for selection recursively, to add support for recursive ranges like "word 3 of paragraph 2".

JackieXie168/skim,JackieXie168/skim,JackieXie168/skim,JackieXie168/skim,JackieXie168/skim