[KinoSearch] Subclassable Highlighter

[Father Chrysostomos]

On Jan 30, 2008, at 1:54 PM, I wrote:

> This patch makes the changes to Highlighter.pm’s public interface,  
> and modifies the test accordingly. It does not yet use HighlightSpan  
> and HeatMap

This patch makes it use those two. I saw in another message that you  
wanted the Scorer to provide the HighlightSpans. I’m not sure exactly  
how you want to accomplish that, but this is a start. It uses the  
Query for now, but at least it eliminates _starts_and_ends and  
_calc_best_location from Highlighter.pm.

I did run into a problem with multiple HighlightSpans with the same  
start offset. It makes the ( 1 / ( 1 + log($diff) ) ) formula in  
HeatMap.pm blow up (log 0). So I’ve added code that eliminates  
duplicates, adding the weights together. I’m not sure if this is how  
it should be done.

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