[XQZone General] returning snippets centered on matches...

[Shannon Scott Shiflett]

Travis, good question, good timing.  I wish I could help, but writing  
code using cts:highlight() to return "highlighted hits in context" is  
something I'll be tasked to do in the very near future, so I'm eager  
to read the responses to this thread....

On Oct 4, 2005, at 5:06 PM, Travis Raybold wrote:

> im searching a data node, and want to return just a subset of the  
> text, centered on the matching string. i've modified some code  
> kelly sent me, and it works fairly well, but a search that used to  
> take a fraction of a second now takes 5 seconds. has anyone coded a  
> function to return snippets instead of the whole text that are  
> reasonably efficient? i could code this in php, but it seems a  
> natural place to use marklogic, if i can just figure out how to  
> make it efficient.
>
> thanks in advance for any help, the sample code follows
>
> --travis
>
> ---------------------------------------------------------------------- 
> ------------------------------
>
> let $string := "totalitarian"
>
> let $query := cts:element-word-query(xs:QName("data"),$string)
>
> return
>
> for $class in (cts:search(//class,$query))
>
> return
>
> <result>
>
> {
>
> let $scope := 5
>
>
> let $hit := cts:highlight($class,$query,concat 
> ("<TRAVISRAYBOLDCONSTANT_START>", 
> $cts:text,"<TRAVISRAYBOLDCONSTANT_END>"))
>
>
> let $hit-text := cts:highlight($class,$query,<span  
> style="color:red;font-weight:bold">{$cts:text}</span>)
>
>
> let $before := tokenize(substring-before 
> ($hit,"<TRAVISRAYBOLDCONSTANT_END>")," ")
>
> let $after := tokenize(substring-after 
> ($hit,"<TRAVISRAYBOLDCONSTANT_START>")," ")
>
>
> let $before-count := count($before)
>
> let $before-snippet := $before[($before-count - $scope) to $before- 
> count]
>
> let $after-snippet := $after[1 to $scope]
>
>
> let $snippet := <snippet>. . . . {string-join(($before-snippet,$hit- 
> text//this-hit/text(),$after-snippet)," ")} . . . . </snippet>
>
>
> let $hilight-snippet :=
>
> cts:highlight($snippet,$string,<span style="color:red;font- 
> weight:bold">{$cts:text}</span>)
>
>
> return $hilight-snippet
>
> }
>
> </result>
>
>
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