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-rw-r--r--lib/dokuwiki/inc/fulltext.php722
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diff --git a/lib/dokuwiki/inc/fulltext.php b/lib/dokuwiki/inc/fulltext.php
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--- a/lib/dokuwiki/inc/fulltext.php
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-<?php
-/**
- * DokuWiki fulltextsearch functions using the index
- *
- * @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
- * @author Andreas Gohr <andi@splitbrain.org>
- */
-
-if(!defined('DOKU_INC')) die('meh.');
-require_once(DOKU_INC.'inc/indexer.php');
-
-
-/**
- * The fulltext search
- *
- * Returns a list of matching documents for the given query
- *
- * refactored into ft_pageSearch(), _ft_pageSearch() and trigger_event()
- *
- */
-function ft_pageSearch($query,&$highlight){
-
- $data['query'] = $query;
- $data['highlight'] =& $highlight;
-
- return trigger_event('SEARCH_QUERY_FULLPAGE', $data, '_ft_pageSearch');
-}
-
-/**
- * Returns a list of matching documents for the given query
- *
- * @author Andreas Gohr <andi@splitbrain.org>
- * @author Kazutaka Miyasaka <kazmiya@gmail.com>
- */
-function _ft_pageSearch(&$data) {
- // parse the given query
- $q = ft_queryParser($data['query']);
- $data['highlight'] = $q['highlight'];
-
- if (empty($q['parsed_ary'])) return array();
-
- // lookup all words found in the query
- $lookup = idx_lookup($q['words']);
-
- // get all pages in this dokuwiki site (!: includes nonexistent pages)
- $pages_all = array();
- foreach (idx_getIndex('page', '') as $id) {
- $pages_all[trim($id)] = 0; // base: 0 hit
- }
-
- // process the query
- $stack = array();
- foreach ($q['parsed_ary'] as $token) {
- switch (substr($token, 0, 3)) {
- case 'W+:':
- case 'W-:':
- case 'W_:': // word
- $word = substr($token, 3);
- $stack[] = (array) $lookup[$word];
- break;
- case 'P+:':
- case 'P-:': // phrase
- $phrase = substr($token, 3);
- // since phrases are always parsed as ((W1)(W2)...(P)),
- // the end($stack) always points the pages that contain
- // all words in this phrase
- $pages = end($stack);
- $pages_matched = array();
- foreach(array_keys($pages) as $id){
- $text = utf8_strtolower(rawWiki($id));
- if (strpos($text, $phrase) !== false) {
- $pages_matched[$id] = 0; // phrase: always 0 hit
- }
- }
- $stack[] = $pages_matched;
- break;
- case 'N+:':
- case 'N-:': // namespace
- $ns = substr($token, 3);
- $pages_matched = array();
- foreach (array_keys($pages_all) as $id) {
- if (strpos($id, $ns) === 0) {
- $pages_matched[$id] = 0; // namespace: always 0 hit
- }
- }
- $stack[] = $pages_matched;
- break;
- case 'AND': // and operation
- list($pages1, $pages2) = array_splice($stack, -2);
- $stack[] = ft_resultCombine(array($pages1, $pages2));
- break;
- case 'OR': // or operation
- list($pages1, $pages2) = array_splice($stack, -2);
- $stack[] = ft_resultUnite(array($pages1, $pages2));
- break;
- case 'NOT': // not operation (unary)
- $pages = array_pop($stack);
- $stack[] = ft_resultComplement(array($pages_all, $pages));
- break;
- }
- }
- $docs = array_pop($stack);
-
- if (empty($docs)) return array();
-
- // check: settings, acls, existence
- foreach (array_keys($docs) as $id) {
- if (isHiddenPage($id) || auth_quickaclcheck($id) < AUTH_READ || !page_exists($id, '', false)) {
- unset($docs[$id]);
- }
- }
-
- // sort docs by count
- arsort($docs);
-
- return $docs;
-}
-
-/**
- * Returns the backlinks for a given page
- *
- * Does a quick lookup with the fulltext index, then
- * evaluates the instructions of the found pages
- */
-function ft_backlinks($id){
- global $conf;
- $swfile = DOKU_INC.'inc/lang/'.$conf['lang'].'/stopwords.txt';
- $stopwords = @file_exists($swfile) ? file($swfile) : array();
-
- $result = array();
-
- // quick lookup of the pagename
- $page = noNS($id);
- $matches = idx_lookup(idx_tokenizer($page,$stopwords)); // pagename may contain specials (_ or .)
- $docs = array_keys(ft_resultCombine(array_values($matches)));
- $docs = array_filter($docs,'isVisiblePage'); // discard hidden pages
- if(!count($docs)) return $result;
- require_once(DOKU_INC.'inc/parserutils.php');
-
- // check metadata for matching links
- foreach($docs as $match){
- // metadata relation reference links are already resolved
- $links = p_get_metadata($match,'relation references');
- if (isset($links[$id])) $result[] = $match;
- }
-
- if(!count($result)) return $result;
-
- // check ACL permissions
- foreach(array_keys($result) as $idx){
- if(auth_quickaclcheck($result[$idx]) < AUTH_READ){
- unset($result[$idx]);
- }
- }
-
- sort($result);
- return $result;
-}
-
-/**
- * Returns the pages that use a given media file
- *
- * Does a quick lookup with the fulltext index, then
- * evaluates the instructions of the found pages
- *
- * Aborts after $max found results
- */
-function ft_mediause($id,$max){
- global $conf;
- $swfile = DOKU_INC.'inc/lang/'.$conf['lang'].'/stopwords.txt';
- $stopwords = @file_exists($swfile) ? file($swfile) : array();
-
- if(!$max) $max = 1; // need to find at least one
-
- $result = array();
-
- // quick lookup of the mediafile
- $media = noNS($id);
- $matches = idx_lookup(idx_tokenizer($media,$stopwords));
- $docs = array_keys(ft_resultCombine(array_values($matches)));
- if(!count($docs)) return $result;
-
- // go through all found pages
- $found = 0;
- $pcre = preg_quote($media,'/');
- foreach($docs as $doc){
- $ns = getNS($doc);
- preg_match_all('/\{\{([^|}]*'.$pcre.'[^|}]*)(|[^}]+)?\}\}/i',rawWiki($doc),$matches);
- foreach($matches[1] as $img){
- $img = trim($img);
- if(preg_match('/^https?:\/\//i',$img)) continue; // skip external images
- list($img) = explode('?',$img); // remove any parameters
- resolve_mediaid($ns,$img,$exists); // resolve the possibly relative img
-
- if($img == $id){ // we have a match
- $result[] = $doc;
- $found++;
- break;
- }
- }
- if($found >= $max) break;
- }
-
- sort($result);
- return $result;
-}
-
-
-
-/**
- * Quicksearch for pagenames
- *
- * By default it only matches the pagename and ignores the
- * namespace. This can be changed with the second parameter
- *
- * refactored into ft_pageLookup(), _ft_pageLookup() and trigger_event()
- *
- * @author Andreas Gohr <andi@splitbrain.org>
- */
-function ft_pageLookup($id,$pageonly=true){
- $data = array('id' => $id, 'pageonly' => $pageonly);
- return trigger_event('SEARCH_QUERY_PAGELOOKUP',$data,'_ft_pageLookup');
-}
-
-function _ft_pageLookup(&$data){
- // split out original parameterrs
- $id = $data['id'];
- $pageonly = $data['pageonly'];
-
- global $conf;
- $id = preg_quote($id,'/');
- $pages = file($conf['indexdir'].'/page.idx');
- if($id) $pages = array_values(preg_grep('/'.$id.'/',$pages));
-
- $cnt = count($pages);
- for($i=0; $i<$cnt; $i++){
- if($pageonly){
- if(!preg_match('/'.$id.'/',noNS($pages[$i]))){
- unset($pages[$i]);
- continue;
- }
- }
- if(!page_exists($pages[$i])){
- unset($pages[$i]);
- continue;
- }
- }
-
- $pages = array_filter($pages,'isVisiblePage'); // discard hidden pages
- if(!count($pages)) return array();
-
- // check ACL permissions
- foreach(array_keys($pages) as $idx){
- if(auth_quickaclcheck(trim($pages[$idx])) < AUTH_READ){
- unset($pages[$idx]);
- }
- }
-
- $pages = array_map('trim',$pages);
- usort($pages,'ft_pagesorter');
- return $pages;
-}
-
-/**
- * Sort pages based on their namespace level first, then on their string
- * values. This makes higher hierarchy pages rank higher than lower hierarchy
- * pages.
- */
-function ft_pagesorter($a, $b){
- $ac = count(explode(':',$a));
- $bc = count(explode(':',$b));
- if($ac < $bc){
- return -1;
- }elseif($ac > $bc){
- return 1;
- }
- return strcmp ($a,$b);
-}
-
-/**
- * Creates a snippet extract
- *
- * @author Andreas Gohr <andi@splitbrain.org>
- * @triggers FULLTEXT_SNIPPET_CREATE
- */
-function ft_snippet($id,$highlight){
- $text = rawWiki($id);
- $evdata = array(
- 'id' => $id,
- 'text' => &$text,
- 'highlight' => &$highlight,
- 'snippet' => '',
- );
-
- $evt = new Doku_Event('FULLTEXT_SNIPPET_CREATE',$evdata);
- if ($evt->advise_before()) {
- $match = array();
- $snippets = array();
- $utf8_offset = $offset = $end = 0;
- $len = utf8_strlen($text);
-
- // build a regexp from the phrases to highlight
- $re1 = '('.join('|',array_map('preg_quote_cb',array_filter((array) $highlight))).')';
- $re2 = "$re1.{0,75}(?!\\1)$re1";
- $re3 = "$re1.{0,45}(?!\\1)$re1.{0,45}(?!\\1)(?!\\2)$re1";
-
- for ($cnt=4; $cnt--;) {
- if (0) {
- } else if (preg_match('/'.$re3.'/iu',$text,$match,PREG_OFFSET_CAPTURE,$offset)) {
- } else if (preg_match('/'.$re2.'/iu',$text,$match,PREG_OFFSET_CAPTURE,$offset)) {
- } else if (preg_match('/'.$re1.'/iu',$text,$match,PREG_OFFSET_CAPTURE,$offset)) {
- } else {
- break;
- }
-
- list($str,$idx) = $match[0];
-
- // convert $idx (a byte offset) into a utf8 character offset
- $utf8_idx = utf8_strlen(substr($text,0,$idx));
- $utf8_len = utf8_strlen($str);
-
- // establish context, 100 bytes surrounding the match string
- // first look to see if we can go 100 either side,
- // then drop to 50 adding any excess if the other side can't go to 50,
- $pre = min($utf8_idx-$utf8_offset,100);
- $post = min($len-$utf8_idx-$utf8_len,100);
-
- if ($pre>50 && $post>50) {
- $pre = $post = 50;
- } else if ($pre>50) {
- $pre = min($pre,100-$post);
- } else if ($post>50) {
- $post = min($post, 100-$pre);
- } else {
- // both are less than 50, means the context is the whole string
- // make it so and break out of this loop - there is no need for the
- // complex snippet calculations
- $snippets = array($text);
- break;
- }
-
- // establish context start and end points, try to append to previous
- // context if possible
- $start = $utf8_idx - $pre;
- $append = ($start < $end) ? $end : false; // still the end of the previous context snippet
- $end = $utf8_idx + $utf8_len + $post; // now set it to the end of this context
-
- if ($append) {
- $snippets[count($snippets)-1] .= utf8_substr($text,$append,$end-$append);
- } else {
- $snippets[] = utf8_substr($text,$start,$end-$start);
- }
-
- // set $offset for next match attempt
- // substract strlen to avoid splitting a potential search success,
- // this is an approximation as the search pattern may match strings
- // of varying length and it will fail if the context snippet
- // boundary breaks a matching string longer than the current match
- $utf8_offset = $utf8_idx + $post;
- $offset = $idx + strlen(utf8_substr($text,$utf8_idx,$post));
- $offset = utf8_correctIdx($text,$offset);
- }
-
- $m = "\1";
- $snippets = preg_replace('/'.$re1.'/iu',$m.'$1'.$m,$snippets);
- $snippet = preg_replace('/'.$m.'([^'.$m.']*?)'.$m.'/iu','<strong class="search_hit">$1</strong>',hsc(join('... ',$snippets)));
-
- $evdata['snippet'] = $snippet;
- }
- $evt->advise_after();
- unset($evt);
-
- return $evdata['snippet'];
-}
-
-/**
- * Combine found documents and sum up their scores
- *
- * This function is used to combine searched words with a logical
- * AND. Only documents available in all arrays are returned.
- *
- * based upon PEAR's PHP_Compat function for array_intersect_key()
- *
- * @param array $args An array of page arrays
- */
-function ft_resultCombine($args){
- $array_count = count($args);
- if($array_count == 1){
- return $args[0];
- }
-
- $result = array();
- if ($array_count > 1) {
- foreach ($args[0] as $key => $value) {
- $result[$key] = $value;
- for ($i = 1; $i !== $array_count; $i++) {
- if (!isset($args[$i][$key])) {
- unset($result[$key]);
- break;
- }
- $result[$key] += $args[$i][$key];
- }
- }
- }
- return $result;
-}
-
-/**
- * Unites found documents and sum up their scores
- *
- * based upon ft_resultCombine() function
- *
- * @param array $args An array of page arrays
- * @author Kazutaka Miyasaka <kazmiya@gmail.com>
- */
-function ft_resultUnite($args) {
- $array_count = count($args);
- if ($array_count === 1) {
- return $args[0];
- }
-
- $result = $args[0];
- for ($i = 1; $i !== $array_count; $i++) {
- foreach (array_keys($args[$i]) as $id) {
- $result[$id] += $args[$i][$id];
- }
- }
- return $result;
-}
-
-/**
- * Computes the difference of documents using page id for comparison
- *
- * nearly identical to PHP5's array_diff_key()
- *
- * @param array $args An array of page arrays
- * @author Kazutaka Miyasaka <kazmiya@gmail.com>
- */
-function ft_resultComplement($args) {
- $array_count = count($args);
- if ($array_count === 1) {
- return $args[0];
- }
-
- $result = $args[0];
- foreach (array_keys($result) as $id) {
- for ($i = 1; $i !== $array_count; $i++) {
- if (isset($args[$i][$id])) unset($result[$id]);
- }
- }
- return $result;
-}
-
-/**
- * Parses a search query and builds an array of search formulas
- *
- * @author Andreas Gohr <andi@splitbrain.org>
- * @author Kazutaka Miyasaka <kazmiya@gmail.com>
- */
-function ft_queryParser($query){
- global $conf;
- $swfile = DOKU_INC.'inc/lang/'.$conf['lang'].'/stopwords.txt';
- $stopwords = @file_exists($swfile) ? file($swfile) : array();
-
- /**
- * parse a search query and transform it into intermediate representation
- *
- * in a search query, you can use the following expressions:
- *
- * words:
- * include
- * -exclude
- * phrases:
- * "phrase to be included"
- * -"phrase you want to exclude"
- * namespaces:
- * @include:namespace (or ns:include:namespace)
- * ^exclude:namespace (or -ns:exclude:namespace)
- * groups:
- * ()
- * -()
- * operators:
- * and ('and' is the default operator: you can always omit this)
- * or (or pipe symbol '|', lower precedence than 'and')
- *
- * e.g. a query [ aa "bb cc" @dd:ee ] means "search pages which contain
- * a word 'aa', a phrase 'bb cc' and are within a namespace 'dd:ee'".
- * this query is equivalent to [ -(-aa or -"bb cc" or -ns:dd:ee) ]
- * as long as you don't mind hit counts.
- *
- * intermediate representation consists of the following parts:
- *
- * ( ) - group
- * AND - logical and
- * OR - logical or
- * NOT - logical not
- * W+:, W-:, W_: - word (underscore: no need to highlight)
- * P+:, P-: - phrase (minus sign: logically in NOT group)
- * N+:, N-: - namespace
- */
- $parsed_query = '';
- $parens_level = 0;
- $terms = preg_split('/(-?".*?")/u', utf8_strtolower($query), -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
-
- foreach ($terms as $term) {
- $parsed = '';
- if (preg_match('/^(-?)"(.+)"$/u', $term, $matches)) {
- // phrase-include and phrase-exclude
- $not = $matches[1] ? 'NOT' : '';
- $parsed = $not.ft_termParser($matches[2], $stopwords, false, true);
- } else {
- // fix incomplete phrase
- $term = str_replace('"', ' ', $term);
-
- // fix parentheses
- $term = str_replace(')' , ' ) ', $term);
- $term = str_replace('(' , ' ( ', $term);
- $term = str_replace('- (', ' -(', $term);
-
- // treat pipe symbols as 'OR' operators
- $term = str_replace('|', ' or ', $term);
-
- // treat ideographic spaces (U+3000) as search term separators
- // FIXME: some more separators?
- $term = preg_replace('/[ \x{3000}]+/u', ' ', $term);
- $term = trim($term);
- if ($term === '') continue;
-
- $tokens = explode(' ', $term);
- foreach ($tokens as $token) {
- if ($token === '(') {
- // parenthesis-include-open
- $parsed .= '(';
- ++$parens_level;
- } elseif ($token === '-(') {
- // parenthesis-exclude-open
- $parsed .= 'NOT(';
- ++$parens_level;
- } elseif ($token === ')') {
- // parenthesis-any-close
- if ($parens_level === 0) continue;
- $parsed .= ')';
- $parens_level--;
- } elseif ($token === 'and') {
- // logical-and (do nothing)
- } elseif ($token === 'or') {
- // logical-or
- $parsed .= 'OR';
- } elseif (preg_match('/^(?:\^|-ns:)(.+)$/u', $token, $matches)) {
- // namespace-exclude
- $parsed .= 'NOT(N+:'.$matches[1].')';
- } elseif (preg_match('/^(?:@|ns:)(.+)$/u', $token, $matches)) {
- // namespace-include
- $parsed .= '(N+:'.$matches[1].')';
- } elseif (preg_match('/^-(.+)$/', $token, $matches)) {
- // word-exclude
- $parsed .= 'NOT('.ft_termParser($matches[1], $stopwords).')';
- } else {
- // word-include
- $parsed .= ft_termParser($token, $stopwords);
- }
- }
- }
- $parsed_query .= $parsed;
- }
-
- // cleanup (very sensitive)
- $parsed_query .= str_repeat(')', $parens_level);
- do {
- $parsed_query_old = $parsed_query;
- $parsed_query = preg_replace('/(NOT)?\(\)/u', '', $parsed_query);
- } while ($parsed_query !== $parsed_query_old);
- $parsed_query = preg_replace('/(NOT|OR)+\)/u', ')' , $parsed_query);
- $parsed_query = preg_replace('/(OR)+/u' , 'OR' , $parsed_query);
- $parsed_query = preg_replace('/\(OR/u' , '(' , $parsed_query);
- $parsed_query = preg_replace('/^OR|OR$/u' , '' , $parsed_query);
- $parsed_query = preg_replace('/\)(NOT)?\(/u' , ')AND$1(', $parsed_query);
-
- // adjustment: make highlightings right
- $parens_level = 0;
- $notgrp_levels = array();
- $parsed_query_new = '';
- $tokens = preg_split('/(NOT\(|[()])/u', $parsed_query, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
- foreach ($tokens as $token) {
- if ($token === 'NOT(') {
- $notgrp_levels[] = ++$parens_level;
- } elseif ($token === '(') {
- ++$parens_level;
- } elseif ($token === ')') {
- if ($parens_level-- === end($notgrp_levels)) array_pop($notgrp_levels);
- } elseif (count($notgrp_levels) % 2 === 1) {
- // turn highlight-flag off if terms are logically in "NOT" group
- $token = preg_replace('/([WPN])\+\:/u', '$1-:', $token);
- }
- $parsed_query_new .= $token;
- }
- $parsed_query = $parsed_query_new;
-
- /**
- * convert infix notation string into postfix (Reverse Polish notation) array
- * by Shunting-yard algorithm
- *
- * see: http://en.wikipedia.org/wiki/Reverse_Polish_notation
- * see: http://en.wikipedia.org/wiki/Shunting-yard_algorithm
- */
- $parsed_ary = array();
- $ope_stack = array();
- $ope_precedence = array(')' => 1, 'OR' => 2, 'AND' => 3, 'NOT' => 4, '(' => 5);
- $ope_regex = '/([()]|OR|AND|NOT)/u';
-
- $tokens = preg_split($ope_regex, $parsed_query, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
- foreach ($tokens as $token) {
- if (preg_match($ope_regex, $token)) {
- // operator
- $last_ope = end($ope_stack);
- while ($ope_precedence[$token] <= $ope_precedence[$last_ope] && $last_ope != '(') {
- $parsed_ary[] = array_pop($ope_stack);
- $last_ope = end($ope_stack);
- }
- if ($token == ')') {
- array_pop($ope_stack); // this array_pop always deletes '('
- } else {
- $ope_stack[] = $token;
- }
- } else {
- // operand
- $token_decoded = str_replace(array('OP', 'CP'), array('(', ')'), $token);
- $parsed_ary[] = $token_decoded;
- }
- }
- $parsed_ary = array_values(array_merge($parsed_ary, array_reverse($ope_stack)));
-
- // cleanup: each double "NOT" in RPN array actually does nothing
- $parsed_ary_count = count($parsed_ary);
- for ($i = 1; $i < $parsed_ary_count; ++$i) {
- if ($parsed_ary[$i] === 'NOT' && $parsed_ary[$i - 1] === 'NOT') {
- unset($parsed_ary[$i], $parsed_ary[$i - 1]);
- }
- }
- $parsed_ary = array_values($parsed_ary);
-
- // build return value
- $q = array();
- $q['query'] = $query;
- $q['parsed_str'] = $parsed_query;
- $q['parsed_ary'] = $parsed_ary;
-
- foreach ($q['parsed_ary'] as $token) {
- if ($token[2] !== ':') continue;
- $body = substr($token, 3);
-
- switch (substr($token, 0, 3)) {
- case 'N+:':
- $q['ns'][] = $body; // for backward compatibility
- break;
- case 'N-:':
- $q['notns'][] = $body; // for backward compatibility
- break;
- case 'W_:':
- $q['words'][] = $body;
- break;
- case 'W-:':
- $q['words'][] = $body;
- $q['not'][] = $body; // for backward compatibility
- break;
- case 'W+:':
- $q['words'][] = $body;
- $q['highlight'][] = str_replace('*', '', $body);
- $q['and'][] = $body; // for backward compatibility
- break;
- case 'P-:':
- $q['phrases'][] = $body;
- break;
- case 'P+:':
- $q['phrases'][] = $body;
- $q['highlight'][] = str_replace('*', '', $body);
- break;
- }
- }
- foreach (array('words', 'phrases', 'highlight', 'ns', 'notns', 'and', 'not') as $key) {
- $q[$key] = empty($q[$key]) ? array() : array_values(array_unique($q[$key]));
- }
-
- return $q;
-}
-
-/**
- * Transforms given search term into intermediate representation
- *
- * This function is used in ft_queryParser() and not for general purpose use.
- *
- * @author Kazutaka Miyasaka <kazmiya@gmail.com>
- */
-function ft_termParser($term, &$stopwords, $consider_asian = true, $phrase_mode = false) {
- $parsed = '';
- if ($consider_asian) {
- // successive asian characters need to be searched as a phrase
- $words = preg_split('/('.IDX_ASIAN.'+)/u', $term, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
- foreach ($words as $word) {
- if (preg_match('/'.IDX_ASIAN.'/u', $word)) $phrase_mode = true;
- $parsed .= ft_termParser($word, $stopwords, false, $phrase_mode);
- }
- } else {
- $term_noparen = str_replace(array('(', ')'), ' ', $term);
- $words = idx_tokenizer($term_noparen, $stopwords, true);
-
- // W_: no need to highlight
- if (empty($words)) {
- $parsed = '()'; // important: do not remove
- } elseif ($words[0] === $term) {
- $parsed = '(W+:'.$words[0].')';
- } elseif ($phrase_mode) {
- $term_encoded = str_replace(array('(', ')'), array('OP', 'CP'), $term);
- $parsed = '((W_:'.implode(')(W_:', $words).')(P+:'.$term_encoded.'))';
- } else {
- $parsed = '((W+:'.implode(')(W+:', $words).'))';
- }
- }
- return $parsed;
-}
-
-//Setup VIM: ex: et ts=4 enc=utf-8 :