Try cts:tokenize() instead of fn:tokenize. Rather than using regex, this
splits text up into cts:word, cts:punctuation, and cts:whitespace items.
For example....
let $n := <p>a b c d e f g h i j k</p>
let $q := 'f'
let $words-before := 3
let $words-after := 3
return cts:highlight(
$n, $q,
element test {
let $words := cts:tokenize($cts:node)[. instance of cts:word]
let $x := index-of($words, $cts:text)[1]
let $start := $x - $words-before
let $stop := $x + $words-after
for $w in $words[$start to $stop]
return
if ($w ne $cts:text) then $w
else element span { attribute class { 'highlight' }, $w }
}
)/test/node()
=>
c d e
<span class="highlight">f</span>
g h i
You might be able to improve on that, but hopefully it gives you the
general idea.
-- Mike
David Sewell wrote:
cts:highlight() will do the highlighting around your search phrase, but
in order to create a partial context around the first match in the
paragraph it's necessary to write a fairly complex ad hoc function,
probably relying on fn:tokenize() to establish the context and then
fn:string-join() to recombine the selected context into something that
can be passed to cts:highlight().
We wrote some code to do just that for a publication, and it works well,
but it's a bit messy and could no doubt be optimized and made more
general-purpose. I'd hesitate to post it to the whole list in its
current state--maybe someone out there has an elegant general-purpose
function to do this task--but I can share it offline if you like.
David S.
On Wed, 20 Aug 2008, Mindie Sorenson wrote:
I’m trying to limit the number of words that are displayed for each search
result. For
example, I need to have the results formatted like this:
... we have the opportunity and also the responsibility to help restore faith
in the
family. ...
I have been able to get the first paragraph from each document that contains
the search
phrase (responsibility), but I haven’t been able to successfully limit the
words to 7
words before the search phrase and 7 after the phrase. I have looked through
the
cts:search functions, but I haven’t been able to find quite what I’m looking
for. Is
there a function that will help me do this?
Thanks
Mindie
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