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dokuwiki/inc/indexer.php

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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($conf['fperm']) chmod($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
$final = array();
foreach(array_keys($result) as $word){
$final[$word] = array();
foreach($result[$word] as $wid){
$hits = &$docs[$wid];
foreach ($hits as $hitkey => $hitcnt) {
$final[$word][$hitkey] = $hitcnt + $final[$word][$hitkey];
}
}
}
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 :
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