asian language support for the indexer #563

Asian languages do not use spaces to seperate words. The indexer however does
a word based lookup. Splitting for example Japanese texts into real words is
only possible with complicated natural language processing, something
completely out of scope for DokuWiki.

This patch solves the problem by treating all asian characters as single
words. When an asian word (consisting of multiple characters) is searched it
is treated as a phrase search, looking up each charcter by it self first,
then checking for the phrase in found documents.

darcs-hash:20050925175451-7ad00-933b33b51b5f2fa05e736c18b8db58a5fdbf41ce.gz

1 files changed, 7 insertions, 4 deletions

diff --git a/inc/fulltext.php b/inc/fulltext.php
index 96f3ad53c..89fa5b259 100644
--- a/inc/fulltext.php
+++ b/inc/fulltext.php
@@ -18,7 +18,6 @@
  */
 function ft_pageSearch($query,&$poswords){
     $q = ft_queryParser($query);
-
     // use this for higlighting later:
     $poswords = join(' ',$q['and']);
 
@@ -51,14 +50,12 @@ function ft_pageSearch($query,&$poswords){
     }
 
     if(!count($docs)) return array();
-
     // handle phrases
     if(count($q['phrases'])){
         //build a regexp
         $q['phrases'] = array_map('utf8_strtolower',$q['phrases']);
         $q['phrases'] = array_map('preg_quote',$q['phrases']);
         $regex = '('.join('|',$q['phrases']).')';
-
         // check the source of all documents for the exact phrases
         foreach(array_keys($docs) as $id){
             $text  = utf8_strtolower(rawWiki($id));
@@ -237,6 +234,7 @@ function ft_resultCombine($args){
  * Builds an array of search words from a query
  *
  * @todo support OR and parenthesises?
+ * @todo add namespace handling
  */
 function ft_queryParser($query){
     global $conf;
@@ -255,7 +253,7 @@ function ft_queryParser($query){
     
     // handle phrase searches
     while(preg_match('/"(.*?)"/',$query,$match)){
-        $q['phrases'][] = $match[0];
+        $q['phrases'][] = $match[1];
         $q['and'] = array_merge(idx_tokenizer($match[0],$stopwords));
         $query = preg_replace('/"(.*?)"/','',$query,1);
     }
@@ -266,6 +264,11 @@ function ft_queryParser($query){
             $token = idx_tokenizer($w,$stopwords);
             if(count($token)) $q['not'] = array_merge($q['not'],$token);
         }else{
+            // asian "words" need to be searched as phrases
+            if(preg_match_all('/('.IDX_ASIAN.'+)/u',$w,$matches)){
+                $q['phrases'] = array_merge($q['phrases'],$matches[1]);
+
+            }
             $token = idx_tokenizer($w,$stopwords);
             if(count($token)) $q['and'] = array_merge($q['and'],$token);
         }