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+<?php
+/**
+ * Common DokuWiki functions
+ *
+ * @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/io.php');
+require_once(DOKU_INC.'inc/utf8.php');
+require_once(DOKU_INC.'inc/parserutils.php');
+
+// set the minimum token length to use in the index (note, this doesn't apply to numeric tokens)
+if (!defined('IDX_MINWORDLENGTH')) define('IDX_MINWORDLENGTH',2);
+
+// Asian characters are handled as words. The following regexp defines the
+// Unicode-Ranges for Asian characters
+// Ranges taken from http://en.wikipedia.org/wiki/Unicode_block
+// I'm no language expert. If you think some ranges are wrongly chosen or
+// a range is missing, please contact me
+define('IDX_ASIAN1','[\x{0E00}-\x{0E7F}]'); // Thai
+define('IDX_ASIAN2','['.
+ '\x{2E80}-\x{3040}'. // CJK -> Hangul
+ '\x{309D}-\x{30A0}'.
+ '\x{30FD}-\x{31EF}\x{3200}-\x{D7AF}'.
+ '\x{F900}-\x{FAFF}'. // CJK Compatibility Ideographs
+ '\x{FE30}-\x{FE4F}'. // CJK Compatibility Forms
+ ']');
+define('IDX_ASIAN3','['. // Hiragana/Katakana (can be two characters)
+ '\x{3042}\x{3044}\x{3046}\x{3048}'.
+ '\x{304A}-\x{3062}\x{3064}-\x{3082}'.
+ '\x{3084}\x{3086}\x{3088}-\x{308D}'.
+ '\x{308F}-\x{3094}'.
+ '\x{30A2}\x{30A4}\x{30A6}\x{30A8}'.
+ '\x{30AA}-\x{30C2}\x{30C4}-\x{30E2}'.
+ '\x{30E4}\x{30E6}\x{30E8}-\x{30ED}'.
+ '\x{30EF}-\x{30F4}\x{30F7}-\x{30FA}'.
+ ']['.
+ '\x{3041}\x{3043}\x{3045}\x{3047}\x{3049}'.
+ '\x{3063}\x{3083}\x{3085}\x{3087}\x{308E}\x{3095}-\x{309C}'.
+ '\x{30A1}\x{30A3}\x{30A5}\x{30A7}\x{30A9}'.
+ '\x{30C3}\x{30E3}\x{30E5}\x{30E7}\x{30EE}\x{30F5}\x{30F6}\x{30FB}\x{30FC}'.
+ '\x{31F0}-\x{31FF}'.
+ ']?');
+define('IDX_ASIAN', '(?:'.IDX_ASIAN1.'|'.IDX_ASIAN2.'|'.IDX_ASIAN3.')');
+
+/**
+ * Measure the length of a string.
+ * Differs from strlen in handling of asian characters.
+ *
+ * @author Tom N Harris <tnharris@whoopdedo.org>
+ */
+function wordlen($w){
+ $l = strlen($w);
+ // If left alone, all chinese "words" will get put into w3.idx
+ // So the "length" of a "word" is faked
+ if(preg_match('/'.IDX_ASIAN2.'/u',$w))
+ $l += ord($w) - 0xE1; // Lead bytes from 0xE2-0xEF
+ return $l;
+}
+
+/**
+ * Write a list of strings to an index file.
+ *
+ * @author Tom N Harris <tnharris@whoopdedo.org>
+ */
+function idx_saveIndex($pre, $wlen, &$idx){
+ global $conf;
+ $fn = $conf['indexdir'].'/'.$pre.$wlen;
+ $fh = @fopen($fn.'.tmp','w');
+ if(!$fh) return false;
+ foreach ($idx as $line) {
+ fwrite($fh,$line);
+ }
+ fclose($fh);
+ if(isset($conf['fperm'])) chmod($fn.'.tmp', $conf['fperm']);
+ io_rename($fn.'.tmp', $fn.'.idx');
+ return true;
+}
+
+/**
+ * Append a given line to an index file.
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function idx_appendIndex($pre, $wlen, $line){
+ global $conf;
+ $fn = $conf['indexdir'].'/'.$pre.$wlen;
+ $fh = @fopen($fn.'.idx','a');
+ if(!$fh) return false;
+ fwrite($fh,$line);
+ fclose($fh);
+ return true;
+}
+
+/**
+ * Read the list of words in an index (if it exists).
+ *
+ * @author Tom N Harris <tnharris@whoopdedo.org>
+ */
+function idx_getIndex($pre, $wlen){
+ global $conf;
+ $fn = $conf['indexdir'].'/'.$pre.$wlen.'.idx';
+ if(!@file_exists($fn)) return array();
+ return file($fn);
+}
+
+/**
+ * Create an empty index file if it doesn't exist yet.
+ *
+ * FIXME: This function isn't currently used. It will probably be removed soon.
+ *
+ * @author Tom N Harris <tnharris@whoopdedo.org>
+ */
+function idx_touchIndex($pre, $wlen){
+ global $conf;
+ $fn = $conf['indexdir'].'/'.$pre.$wlen.'.idx';
+ if(!@file_exists($fn)){
+ touch($fn);
+ if($conf['fperm']) chmod($fn, $conf['fperm']);
+ }
+}
+
+/**
+ * Read a line ending with \n.
+ * Returns false on EOF.
+ *
+ * @author Tom N Harris <tnharris@whoopdedo.org>
+ */
+function _freadline($fh) {
+ if (feof($fh)) return false;
+ $ln = '';
+ while (($buf = fgets($fh,4096)) !== false) {
+ $ln .= $buf;
+ if (substr($buf,-1) == "\n") break;
+ }
+ if ($ln === '') return false;
+ if (substr($ln,-1) != "\n") $ln .= "\n";
+ return $ln;
+}
+
+/**
+ * Write a line to an index file.
+ *
+ * @author Tom N Harris <tnharris@whoopdedo.org>
+ */
+function idx_saveIndexLine($pre, $wlen, $idx, $line){
+ global $conf;
+ if(substr($line,-1) != "\n") $line .= "\n";
+ $fn = $conf['indexdir'].'/'.$pre.$wlen;
+ $fh = @fopen($fn.'.tmp','w');
+ if(!$fh) return false;
+ $ih = @fopen($fn.'.idx','r');
+ if ($ih) {
+ $ln = -1;
+ while (($curline = _freadline($ih)) !== false) {
+ if (++$ln == $idx) {
+ fwrite($fh, $line);
+ } else {
+ fwrite($fh, $curline);
+ }
+ }
+ if ($idx > $ln) {
+ fwrite($fh,$line);
+ }
+ fclose($ih);
+ } else {
+ fwrite($fh,$line);
+ }
+ fclose($fh);
+ if($conf['fperm']) chmod($fn.'.tmp', $conf['fperm']);
+ io_rename($fn.'.tmp', $fn.'.idx');
+ return true;
+}
+
+/**
+ * Read a single line from an index (if it exists).
+ *
+ * @author Tom N Harris <tnharris@whoopdedo.org>
+ */
+function idx_getIndexLine($pre, $wlen, $idx){
+ global $conf;
+ $fn = $conf['indexdir'].'/'.$pre.$wlen.'.idx';
+ if(!@file_exists($fn)) return '';
+ $fh = @fopen($fn,'r');
+ if(!$fh) return '';
+ $ln = -1;
+ while (($line = _freadline($fh)) !== false) {
+ if (++$ln == $idx) break;
+ }
+ fclose($fh);
+ return "$line";
+}
+
+/**
+ * Split a page into words
+ *
+ * Returns an array of word counts, false if an error occurred.
+ * Array is keyed on the word length, then the word index.
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @author Christopher Smith <chris@jalakai.co.uk>
+ */
+function idx_getPageWords($page){
+ global $conf;
+ $swfile = DOKU_INC.'inc/lang/'.$conf['lang'].'/stopwords.txt';
+ if(@file_exists($swfile)){
+ $stopwords = file($swfile);
+ }else{
+ $stopwords = array();
+ }
+
+ $body = '';
+ $data = array($page, $body);
+ $evt = new Doku_Event('INDEXER_PAGE_ADD', $data);
+ if ($evt->advise_before()) $data[1] .= rawWiki($page);
+ $evt->advise_after();
+ unset($evt);
+
+ list($page,$body) = $data;
+
+ $body = strtr($body, "\r\n\t", ' ');
+ $tokens = explode(' ', $body);
+ $tokens = array_count_values($tokens); // count the frequency of each token
+
+ // ensure the deaccented or romanised page names of internal links are added to the token array
+ // (this is necessary for the backlink function -- there maybe a better way!)
+ if ($conf['deaccent']) {
+ $links = p_get_metadata($page,'relation references');
+
+ if (!empty($links)) {
+ $tmp = join(' ',array_keys($links)); // make a single string
+ $tmp = strtr($tmp, ':', ' '); // replace namespace separator with a space
+ $link_tokens = array_unique(explode(' ', $tmp)); // break into tokens
+
+ foreach ($link_tokens as $link_token) {
+ if (isset($tokens[$link_token])) continue;
+ $tokens[$link_token] = 1;
+ }
+ }
+ }
+
+ $words = array();
+ foreach ($tokens as $word => $count) {
+ $arr = idx_tokenizer($word,$stopwords);
+ $arr = array_count_values($arr);
+ foreach ($arr as $w => $c) {
+ $l = wordlen($w);
+ if(isset($words[$l])){
+ $words[$l][$w] = $c * $count + (isset($words[$l][$w]) ? $words[$l][$w] : 0);
+ }else{
+ $words[$l] = array($w => $c * $count);
+ }
+ }
+ }
+
+ // arrive here with $words = array(wordlen => array(word => frequency))
+
+ $index = array(); //resulting index
+ foreach (array_keys($words) as $wlen){
+ $word_idx = idx_getIndex('w',$wlen);
+ foreach ($words[$wlen] as $word => $freq) {
+ $wid = array_search("$word\n",$word_idx);
+ if(!is_int($wid)){
+ $wid = count($word_idx);
+ $word_idx[] = "$word\n";
+ }
+ if(!isset($index[$wlen]))
+ $index[$wlen] = array();
+ $index[$wlen][$wid] = $freq;
+ }
+
+ // save back word index
+ if(!idx_saveIndex('w',$wlen,$word_idx)){
+ trigger_error("Failed to write word index", E_USER_ERROR);
+ return false;
+ }
+ }
+
+ return $index;
+}
+
+/**
+ * Adds/updates the search for the given page
+ *
+ * This is the core function of the indexer which does most
+ * of the work. This function needs to be called with proper
+ * locking!
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function idx_addPage($page){
+ global $conf;
+
+ // load known documents
+ $page_idx = idx_getIndex('page','');
+
+ // get page id (this is the linenumber in page.idx)
+ $pid = array_search("$page\n",$page_idx);
+ if(!is_int($pid)){
+ $pid = count($page_idx);
+ // page was new - write back
+ if (!idx_appendIndex('page','',"$page\n")){
+ trigger_error("Failed to write page index", E_USER_ERROR);
+ return false;
+ }
+ }
+ unset($page_idx); // free memory
+
+ $pagewords = array();
+ // get word usage in page
+ $words = idx_getPageWords($page);
+ if($words === false) return false;
+
+ if(!empty($words)) {
+ foreach(array_keys($words) as $wlen){
+ $index = idx_getIndex('i',$wlen);
+ foreach($words[$wlen] as $wid => $freq){
+ if($wid<count($index)){
+ $index[$wid] = idx_updateIndexLine($index[$wid],$pid,$freq);
+ }else{
+ // New words **should** have been added in increasing order
+ // starting with the first unassigned index.
+ // If someone can show how this isn't true, then I'll need to sort
+ // or do something special.
+ $index[$wid] = idx_updateIndexLine('',$pid,$freq);
+ }
+ $pagewords[] = "$wlen*$wid";
+ }
+ // save back word index
+ if(!idx_saveIndex('i',$wlen,$index)){
+ trigger_error("Failed to write index", E_USER_ERROR);
+ return false;
+ }
+ }
+ }
+
+ // Remove obsolete index entries
+ $pageword_idx = trim(idx_getIndexLine('pageword','',$pid));
+ if ($pageword_idx !== '') {
+ $oldwords = explode(':',$pageword_idx);
+ $delwords = array_diff($oldwords, $pagewords);
+ $upwords = array();
+ foreach ($delwords as $word) {
+ if($word=='') continue;
+ list($wlen,$wid) = explode('*',$word);
+ $wid = (int)$wid;
+ $upwords[$wlen][] = $wid;
+ }
+ foreach ($upwords as $wlen => $widx) {
+ $index = idx_getIndex('i',$wlen);
+ foreach ($widx as $wid) {
+ $index[$wid] = idx_updateIndexLine($index[$wid],$pid,0);
+ }
+ idx_saveIndex('i',$wlen,$index);
+ }
+ }
+ // Save the reverse index
+ $pageword_idx = join(':',$pagewords)."\n";
+ if(!idx_saveIndexLine('pageword','',$pid,$pageword_idx)){
+ trigger_error("Failed to write word index", E_USER_ERROR);
+ return false;
+ }
+
+ return true;
+}
+
+/**
+ * Write a new index line to the filehandle
+ *
+ * This function writes an line for the index file to the
+ * given filehandle. It removes the given document from
+ * the given line and readds it when $count is >0.
+ *
+ * @deprecated - see idx_updateIndexLine
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function idx_writeIndexLine($fh,$line,$pid,$count){
+ fwrite($fh,idx_updateIndexLine($line,$pid,$count));
+}
+
+/**
+ * Modify an index line with new information
+ *
+ * This returns a line of the index. It removes the
+ * given document from the line and readds it if
+ * $count is >0.
+ *
+ * @author Tom N Harris <tnharris@whoopdedo.org>
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function idx_updateIndexLine($line,$pid,$count){
+ $line = trim($line);
+ $updated = array();
+ if($line != ''){
+ $parts = explode(':',$line);
+ // remove doc from given line
+ foreach($parts as $part){
+ if($part == '') continue;
+ list($doc,$cnt) = explode('*',$part);
+ if($doc != $pid){
+ $updated[] = $part;
+ }
+ }
+ }
+
+ // add doc
+ if ($count){
+ $updated[] = "$pid*$count";
+ }
+
+ return join(':',$updated)."\n";
+}
+
+/**
+ * Get the word lengths that have been indexed.
+ *
+ * Reads the index directory and returns an array of lengths
+ * that there are indices for.
+ *
+ * @author Tom N Harris <tnharris@whoopdedo.org>
+ */
+function idx_indexLengths(&$filter){
+ global $conf;
+ $dir = @opendir($conf['indexdir']);
+ if($dir===false)
+ return array();
+ $idx = array();
+ if(is_array($filter)){
+ while (($f = readdir($dir)) !== false) {
+ if (substr($f,0,1) == 'i' && substr($f,-4) == '.idx'){
+ $i = substr($f,1,-4);
+ if (is_numeric($i) && isset($filter[(int)$i]))
+ $idx[] = (int)$i;
+ }
+ }
+ }else{
+ // Exact match first.
+ if(@file_exists($conf['indexdir']."/i$filter.idx"))
+ $idx[] = $filter;
+ while (($f = readdir($dir)) !== false) {
+ if (substr($f,0,1) == 'i' && substr($f,-4) == '.idx'){
+ $i = substr($f,1,-4);
+ if (is_numeric($i) && $i > $filter)
+ $idx[] = (int)$i;
+ }
+ }
+ }
+ closedir($dir);
+ return $idx;
+}
+
+/**
+ * Find the the index number of each search term.
+ *
+ * This will group together words that appear in the same index.
+ * So it should perform better, because it only opens each index once.
+ * Actually, it's not that great. (in my experience) Probably because of the disk cache.
+ * And the sorted function does more work, making it slightly slower in some cases.
+ *
+ * @param array $words The query terms. Words should only contain valid characters,
+ * with a '*' at either the beginning or end of the word (or both)
+ * @param arrayref $result Set to word => array("length*id" ...), use this to merge the
+ * index locations with the appropriate query term.
+ * @return array Set to length => array(id ...)
+ *
+ * @author Tom N Harris <tnharris@whoopdedo.org>
+ */
+function idx_getIndexWordsSorted($words,&$result){
+ // parse and sort tokens
+ $tokens = array();
+ $tokenlength = array();
+ $tokenwild = array();
+ foreach($words as $word){
+ $result[$word] = array();
+ $wild = 0;
+ $xword = $word;
+ $wlen = wordlen($word);
+
+ // check for wildcards
+ if(substr($xword,0,1) == '*'){
+ $xword = substr($xword,1);
+ $wild |= 1;
+ $wlen -= 1;
+ }
+ if(substr($xword,-1,1) == '*'){
+ $xword = substr($xword,0,-1);
+ $wild |= 2;
+ $wlen -= 1;
+ }
+ if ($wlen < IDX_MINWORDLENGTH && $wild == 0 && !is_numeric($xword)) continue;
+ if(!isset($tokens[$xword])){
+ $tokenlength[$wlen][] = $xword;
+ }
+ if($wild){
+ $ptn = preg_quote($xword,'/');
+ if(($wild&1) == 0) $ptn = '^'.$ptn;
+ if(($wild&2) == 0) $ptn = $ptn.'$';
+ $tokens[$xword][] = array($word, '/'.$ptn.'/');
+ if(!isset($tokenwild[$xword])) $tokenwild[$xword] = $wlen;
+ }else
+ $tokens[$xword][] = array($word, null);
+ }
+ asort($tokenwild);
+ // $tokens = array( base word => array( [ query word , grep pattern ] ... ) ... )
+ // $tokenlength = array( base word length => base word ... )
+ // $tokenwild = array( base word => base word length ... )
+
+ $length_filter = empty($tokenwild) ? $tokenlength : min(array_keys($tokenlength));
+ $indexes_known = idx_indexLengths($length_filter);
+ if(!empty($tokenwild)) sort($indexes_known);
+ // get word IDs
+ $wids = array();
+ foreach($indexes_known as $ixlen){
+ $word_idx = idx_getIndex('w',$ixlen);
+ // handle exact search
+ if(isset($tokenlength[$ixlen])){
+ foreach($tokenlength[$ixlen] as $xword){
+ $wid = array_search("$xword\n",$word_idx);
+ if(is_int($wid)){
+ $wids[$ixlen][] = $wid;
+ foreach($tokens[$xword] as $w)
+ $result[$w[0]][] = "$ixlen*$wid";
+ }
+ }
+ }
+ // handle wildcard search
+ foreach($tokenwild as $xword => $wlen){
+ if($wlen >= $ixlen) break;
+ foreach($tokens[$xword] as $w){
+ if(is_null($w[1])) continue;
+ foreach(array_keys(preg_grep($w[1],$word_idx)) as $wid){
+ $wids[$ixlen][] = $wid;
+ $result[$w[0]][] = "$ixlen*$wid";
+ }
+ }
+ }
+ }
+ return $wids;
+}
+
+/**
+ * Lookup words in index
+ *
+ * Takes an array of word and will return a list of matching
+ * documents for each one.
+ *
+ * Important: No ACL checking is done here! All results are
+ * returned, regardless of permissions
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function idx_lookup($words){
+ global $conf;
+
+ $result = array();
+
+ $wids = idx_getIndexWordsSorted($words, $result);
+ if(empty($wids)) return array();
+
+ // load known words and documents
+ $page_idx = idx_getIndex('page','');
+
+ $docs = array(); // hold docs found
+ foreach(array_keys($wids) as $wlen){
+ $wids[$wlen] = array_unique($wids[$wlen]);
+ $index = idx_getIndex('i',$wlen);
+ foreach($wids[$wlen] as $ixid){
+ if($ixid < count($index))
+ $docs["$wlen*$ixid"] = idx_parseIndexLine($page_idx,$index[$ixid]);
+ }
+ }
+
+ // merge found pages into final result array
+ $final = array();
+ foreach($result as $word => $res){
+ $final[$word] = array();
+ foreach($res as $wid){
+ $hits = &$docs[$wid];
+ foreach ($hits as $hitkey => $hitcnt) {
+ if (!isset($final[$word][$hitkey])) {
+ $final[$word][$hitkey] = $hitcnt;
+ } else {
+ $final[$word][$hitkey] += $hitcnt;
+ }
+ }
+ }
+ }
+ return $final;
+}
+
+/**
+ * Returns a list of documents and counts from a index line
+ *
+ * It omits docs with a count of 0 and pages that no longer
+ * exist.
+ *
+ * @param array $page_idx The list of known pages
+ * @param string $line A line from the main index
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function idx_parseIndexLine(&$page_idx,$line){
+ $result = array();
+
+ $line = trim($line);
+ if($line == '') return $result;
+
+ $parts = explode(':',$line);
+ foreach($parts as $part){
+ if($part == '') continue;
+ list($doc,$cnt) = explode('*',$part);
+ if(!$cnt) continue;
+ $doc = trim($page_idx[$doc]);
+ if(!$doc) continue;
+ // make sure the document still exists
+ if(!page_exists($doc,'',false)) continue;
+
+ $result[$doc] = $cnt;
+ }
+ return $result;
+}
+
+/**
+ * Tokenizes a string into an array of search words
+ *
+ * Uses the same algorithm as idx_getPageWords()
+ *
+ * @param string $string the query as given by the user
+ * @param arrayref $stopwords array of stopwords
+ * @param boolean $wc are wildcards allowed?
+ */
+function idx_tokenizer($string,&$stopwords,$wc=false){
+ $words = array();
+ $wc = ($wc) ? '' : $wc = '\*';
+
+ if(preg_match('/[^0-9A-Za-z]/u', $string)){
+ // handle asian chars as single words (may fail on older PHP version)
+ $asia = @preg_replace('/('.IDX_ASIAN.')/u',' \1 ',$string);
+ if(!is_null($asia)) $string = $asia; //recover from regexp failure
+
+ $arr = explode(' ', utf8_stripspecials($string,' ','\._\-:'.$wc));
+ foreach ($arr as $w) {
+ if (!is_numeric($w) && strlen($w) < IDX_MINWORDLENGTH) continue;
+ $w = utf8_strtolower($w);
+ if($stopwords && is_int(array_search("$w\n",$stopwords))) continue;
+ $words[] = $w;
+ }
+ }else{
+ $w = $string;
+ if (!is_numeric($w) && strlen($w) < IDX_MINWORDLENGTH) return $words;
+ $w = strtolower($w);
+ if(is_int(array_search("$w\n",$stopwords))) return $words;
+ $words[] = $w;
+ }
+
+ return $words;
+}
+
+/**
+ * Create a pagewords index from the existing index.
+ *
+ * @author Tom N Harris <tnharris@whoopdedo.org>
+ */
+function idx_upgradePageWords(){
+ global $conf;
+ $page_idx = idx_getIndex('page','');
+ if (empty($page_idx)) return;
+ $pagewords = array();
+ $len = count($page_idx);
+ for ($n=0;$n<$len;$n++){
+ $pagewords[] = array();
+ }
+ unset($page_idx);
+
+ $n=0;
+ foreach (idx_indexLengths($n) as $wlen) {
+ $lines = idx_getIndex('i',$wlen);
+ $len = count($lines);
+ for ($wid=0;$wid<$len;$wid++) {
+ $wkey = "$wlen*$wid";
+ foreach (explode(':',trim($lines[$wid])) as $part) {
+ if($part == '') continue;
+ list($doc,$cnt) = explode('*',$part);
+ $pagewords[(int)$doc][] = $wkey;
+ }
+ }
+ }
+
+ $fn = $conf['indexdir'].'/pageword';
+ $fh = @fopen($fn.'.tmp','w');
+ if (!$fh){
+ trigger_error("Failed to write word index", E_USER_ERROR);
+ return false;
+ }
+ foreach ($pagewords as $line){
+ fwrite($fh, join(':',$line)."\n");
+ }
+ fclose($fh);
+ if($conf['fperm']) chmod($fn.'.tmp', $conf['fperm']);
+ io_rename($fn.'.tmp', $fn.'.idx');
+ return true;
+}
+
+//Setup VIM: ex: et ts=4 enc=utf-8 :