The text parser would be the best place for you to start looking.  It
determines the rectangles for each text draw operation (which is not the
same as what you are asking, but it's a starting point at least).  What you
are asking for is very difficult to do with PDF in the general case because
PDF doesn't have a concept of words, but that will get you a starting point
so you'll at least understand what is involved.  Pay particular attention to
the part of the algorithm that figures out spaces between words.

Good luck!

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