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1612 lines (1488 loc) · 55.1 KB
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<?php
/**
* Functions to create the fulltext search index
*
* @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
* @author Andreas Gohr <andi@splitbrain.org>
* @author Tom N Harris <tnharris@whoopdedo.org>
*/
if(!defined('DOKU_INC')) die('meh.');
// Version tag used to force rebuild on upgrade
define('INDEXER_VERSION', 5);
// 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
"\xF0\xA0\x80\x80-\xF0\xAA\x9B\x9F". // CJK Extension B
"\xF0\xAA\x9C\x80-\xF0\xAB\x9C\xBF". // CJK Extension C
"\xF0\xAB\x9D\x80-\xF0\xAB\xA0\x9F". // CJK Extension D
"\xF0\xAF\xA0\x80-\xF0\xAF\xAB\xBF". // CJK Compatibility Supplement
']');
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.')');
/**
* Version of the indexer taking into consideration the external tokenizer.
* The indexer is only compatible with data written by the same version.
*
* @triggers INDEXER_VERSION_GET
* Plugins that modify what gets indexed should hook this event and
* add their version info to the event data like so:
* $data[$plugin_name] = $plugin_version;
*
* @author Tom N Harris <tnharris@whoopdedo.org>
* @author Michael Hamann <michael@content-space.de>
*/
function idx_get_version(){
static $indexer_version = null;
if ($indexer_version == null) {
$version = INDEXER_VERSION;
// DokuWiki version is included for the convenience of plugins
$data = array('dokuwiki'=>$version);
trigger_event('INDEXER_VERSION_GET', $data, null, false);
unset($data['dokuwiki']); // this needs to be first
ksort($data);
foreach ($data as $plugin=>$vers)
$version .= '+'.$plugin.'='.$vers;
$indexer_version = $version;
}
return $indexer_version;
}
/**
* Measure the length of a string.
* Differs from strlen in handling of asian characters.
*
* @author Tom N Harris <tnharris@whoopdedo.org>
*/
function wordlen($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_all('/[\xE2-\xEF]/',$w,$leadbytes)) {
foreach($leadbytes[0] as $b)
$l += ord($b) - 0xE1;
}
return $l;
}
/**
* Class that encapsulates operations on the indexer database.
*
* @author Tom N Harris <tnharris@whoopdedo.org>
*/
class Doku_Indexer {
/**
* @var array $pidCache Cache for getPID()
*/
protected $pidCache = array();
/**
* Adds the contents of a page to the fulltext index
*
* The added text replaces previous words for the same page.
* An empty value erases the page.
*
* @param string $page a page name
* @param string $text the body of the page
* @return boolean the function completed successfully
* @author Tom N Harris <tnharris@whoopdedo.org>
* @author Andreas Gohr <andi@splitbrain.org>
*/
public function addPageWords($page, $text) {
if (!$this->lock())
return "locked";
// load known documents
$pid = $this->getPIDNoLock($page);
if ($pid === false) {
$this->unlock();
return false;
}
$pagewords = array();
// get word usage in page
$words = $this->getPageWords($text);
if ($words === false) {
$this->unlock();
return false;
}
if (!empty($words)) {
foreach (array_keys($words) as $wlen) {
$index = $this->getIndex('i', $wlen);
foreach ($words[$wlen] as $wid => $freq) {
$idx = ($wid<count($index)) ? $index[$wid] : '';
$index[$wid] = $this->updateTuple($idx, $pid, $freq);
$pagewords[] = "$wlen*$wid";
}
if (!$this->saveIndex('i', $wlen, $index)) {
$this->unlock();
return false;
}
}
}
// Remove obsolete index entries
$pageword_idx = $this->getIndexKey('pageword', '', $pid);
if ($pageword_idx !== '') {
$oldwords = explode(':',$pageword_idx);
$delwords = array_diff($oldwords, $pagewords);
$upwords = array();
foreach ($delwords as $word) {
if ($word != '') {
list($wlen,$wid) = explode('*', $word);
$wid = (int)$wid;
$upwords[$wlen][] = $wid;
}
}
foreach ($upwords as $wlen => $widx) {
$index = $this->getIndex('i', $wlen);
foreach ($widx as $wid) {
$index[$wid] = $this->updateTuple($index[$wid], $pid, 0);
}
$this->saveIndex('i', $wlen, $index);
}
}
// Save the reverse index
$pageword_idx = join(':', $pagewords);
if (!$this->saveIndexKey('pageword', '', $pid, $pageword_idx)) {
$this->unlock();
return false;
}
$this->unlock();
return true;
}
/**
* Split the words in a page and add them to the index.
*
* @param string $text content of the page
* @return array list of word IDs and number of times used
* @author Andreas Gohr <andi@splitbrain.org>
* @author Christopher Smith <chris@jalakai.co.uk>
* @author Tom N Harris <tnharris@whoopdedo.org>
*/
protected function getPageWords($text) {
$tokens = $this->tokenizer($text);
$tokens = array_count_values($tokens); // count the frequency of each token
$words = array();
foreach ($tokens as $w=>$c) {
$l = wordlen($w);
if (isset($words[$l])){
$words[$l][$w] = $c + (isset($words[$l][$w]) ? $words[$l][$w] : 0);
}else{
$words[$l] = array($w => $c);
}
}
// arrive here with $words = array(wordlen => array(word => frequency))
$word_idx_modified = false;
$index = array(); //resulting index
foreach (array_keys($words) as $wlen) {
$word_idx = $this->getIndex('w', $wlen);
foreach ($words[$wlen] as $word => $freq) {
$wid = array_search($word, $word_idx);
if ($wid === false) {
$wid = count($word_idx);
$word_idx[] = $word;
$word_idx_modified = true;
}
if (!isset($index[$wlen]))
$index[$wlen] = array();
$index[$wlen][$wid] = $freq;
}
// save back the word index
if ($word_idx_modified && !$this->saveIndex('w', $wlen, $word_idx))
return false;
}
return $index;
}
/**
* Add/update keys to/of the metadata index.
*
* Adding new keys does not remove other keys for the page.
* An empty value will erase the key.
* The $key parameter can be an array to add multiple keys. $value will
* not be used if $key is an array.
*
* @param string $page a page name
* @param mixed $key a key string or array of key=>value pairs
* @param mixed $value the value or list of values
* @return boolean the function completed successfully
* @author Tom N Harris <tnharris@whoopdedo.org>
* @author Michael Hamann <michael@content-space.de>
*/
public function addMetaKeys($page, $key, $value=null) {
if (!is_array($key)) {
$key = array($key => $value);
} elseif (!is_null($value)) {
// $key is array, but $value is not null
trigger_error("array passed to addMetaKeys but value is not null", E_USER_WARNING);
}
if (!$this->lock())
return "locked";
// load known documents
$pid = $this->getPIDNoLock($page);
if ($pid === false) {
$this->unlock();
return false;
}
// Special handling for titles so the index file is simpler
if (array_key_exists('title', $key)) {
$value = $key['title'];
if (is_array($value))
$value = $value[0];
$this->saveIndexKey('title', '', $pid, $value);
unset($key['title']);
}
foreach ($key as $name => $values) {
$metaname = idx_cleanName($name);
$this->addIndexKey('metadata', '', $metaname);
$metaidx = $this->getIndex($metaname.'_i', '');
$metawords = $this->getIndex($metaname.'_w', '');
$addwords = false;
if (!is_array($values)) $values = array($values);
$val_idx = $this->getIndexKey($metaname.'_p', '', $pid);
if ($val_idx != '') {
$val_idx = explode(':', $val_idx);
// -1 means remove, 0 keep, 1 add
$val_idx = array_combine($val_idx, array_fill(0, count($val_idx), -1));
} else {
$val_idx = array();
}
foreach ($values as $val) {
$val = (string)$val;
if ($val !== "") {
$id = array_search($val, $metawords);
if ($id === false) {
$id = count($metawords);
$metawords[$id] = $val;
$addwords = true;
}
// test if value is already in the index
if (isset($val_idx[$id]) && $val_idx[$id] <= 0)
$val_idx[$id] = 0;
else // else add it
$val_idx[$id] = 1;
}
}
if ($addwords)
$this->saveIndex($metaname.'_w', '', $metawords);
$vals_changed = false;
foreach ($val_idx as $id => $action) {
if ($action == -1) {
$metaidx[$id] = $this->updateTuple($metaidx[$id], $pid, 0);
$vals_changed = true;
unset($val_idx[$id]);
} elseif ($action == 1) {
$metaidx[$id] = $this->updateTuple($metaidx[$id], $pid, 1);
$vals_changed = true;
}
}
if ($vals_changed) {
$this->saveIndex($metaname.'_i', '', $metaidx);
$val_idx = implode(':', array_keys($val_idx));
$this->saveIndexKey($metaname.'_p', '', $pid, $val_idx);
}
unset($metaidx);
unset($metawords);
}
$this->unlock();
return true;
}
/**
* Rename a page in the search index without changing the indexed content. This function doesn't check if the
* old or new name exists in the filesystem. It returns an error if the old page isn't in the page list of the
* indexer and it deletes all previously indexed content of the new page.
*
* @param string $oldpage The old page name
* @param string $newpage The new page name
* @return string|bool If the page was successfully renamed, can be a message in the case of an error
*/
public function renamePage($oldpage, $newpage) {
if (!$this->lock()) return 'locked';
$pages = $this->getPages();
$id = array_search($oldpage, $pages);
if ($id === false) {
$this->unlock();
return 'page is not in index';
}
$new_id = array_search($newpage, $pages);
if ($new_id !== false) {
// make sure the page is not in the index anymore
if ($this->deletePageNoLock($newpage) !== true) {
return false;
}
$pages[$new_id] = 'deleted:'.time().rand(0, 9999);
}
$pages[$id] = $newpage;
// update index
if (!$this->saveIndex('page', '', $pages)) {
$this->unlock();
return false;
}
// reset the pid cache
$this->pidCache = array();
$this->unlock();
return true;
}
/**
* Renames a meta value in the index. This doesn't change the meta value in the pages, it assumes that all pages
* will be updated.
*
* @param string $key The metadata key of which a value shall be changed
* @param string $oldvalue The old value that shall be renamed
* @param string $newvalue The new value to which the old value shall be renamed, can exist (then values will be merged)
* @return bool|string If renaming the value has been successful, false or error message on error.
*/
public function renameMetaValue($key, $oldvalue, $newvalue) {
if (!$this->lock()) return 'locked';
// change the relation references index
$metavalues = $this->getIndex($key, '_w');
$oldid = array_search($oldvalue, $metavalues);
if ($oldid !== false) {
$newid = array_search($newvalue, $metavalues);
if ($newid !== false) {
// free memory
unset ($metavalues);
// okay, now we have two entries for the same value. we need to merge them.
$indexline = $this->getIndexKey($key, '_i', $oldid);
if ($indexline != '') {
$newindexline = $this->getIndexKey($key, '_i', $newid);
$pagekeys = $this->getIndex($key, '_p');
$parts = explode(':', $indexline);
foreach ($parts as $part) {
list($id, $count) = explode('*', $part);
$newindexline = $this->updateTuple($newindexline, $id, $count);
$keyline = explode(':', $pagekeys[$id]);
// remove old meta value
$keyline = array_diff($keyline, array($oldid));
// add new meta value when not already present
if (!in_array($newid, $keyline)) {
array_push($keyline, $newid);
}
$pagekeys[$id] = implode(':', $keyline);
}
$this->saveIndex($key, '_p', $pagekeys);
unset($pagekeys);
$this->saveIndexKey($key, '_i', $oldid, '');
$this->saveIndexKey($key, '_i', $newid, $newindexline);
}
} else {
$metavalues[$oldid] = $newvalue;
if (!$this->saveIndex($key, '_w', $metavalues)) {
$this->unlock();
return false;
}
}
}
$this->unlock();
return true;
}
/**
* Remove a page from the index
*
* Erases entries in all known indexes.
*
* @param string $page a page name
* @return boolean the function completed successfully
* @author Tom N Harris <tnharris@whoopdedo.org>
*/
public function deletePage($page) {
if (!$this->lock())
return "locked";
$result = $this->deletePageNoLock($page);
$this->unlock();
return $result;
}
/**
* Remove a page from the index without locking the index, only use this function if the index is already locked
*
* Erases entries in all known indexes.
*
* @param string $page a page name
* @return boolean the function completed successfully
* @author Tom N Harris <tnharris@whoopdedo.org>
*/
protected function deletePageNoLock($page) {
// load known documents
$pid = $this->getPIDNoLock($page);
if ($pid === false) {
return false;
}
// Remove obsolete index entries
$pageword_idx = $this->getIndexKey('pageword', '', $pid);
if ($pageword_idx !== '') {
$delwords = explode(':',$pageword_idx);
$upwords = array();
foreach ($delwords as $word) {
if ($word != '') {
list($wlen,$wid) = explode('*', $word);
$wid = (int)$wid;
$upwords[$wlen][] = $wid;
}
}
foreach ($upwords as $wlen => $widx) {
$index = $this->getIndex('i', $wlen);
foreach ($widx as $wid) {
$index[$wid] = $this->updateTuple($index[$wid], $pid, 0);
}
$this->saveIndex('i', $wlen, $index);
}
}
// Save the reverse index
if (!$this->saveIndexKey('pageword', '', $pid, "")) {
return false;
}
$this->saveIndexKey('title', '', $pid, "");
$keyidx = $this->getIndex('metadata', '');
foreach ($keyidx as $metaname) {
$val_idx = explode(':', $this->getIndexKey($metaname.'_p', '', $pid));
$meta_idx = $this->getIndex($metaname.'_i', '');
foreach ($val_idx as $id) {
if ($id === '') continue;
$meta_idx[$id] = $this->updateTuple($meta_idx[$id], $pid, 0);
}
$this->saveIndex($metaname.'_i', '', $meta_idx);
$this->saveIndexKey($metaname.'_p', '', $pid, '');
}
return true;
}
/**
* Clear the whole index
*
* @return bool If the index has been cleared successfully
*/
public function clear() {
global $conf;
if (!$this->lock()) return false;
@unlink($conf['indexdir'].'/page.idx');
@unlink($conf['indexdir'].'/title.idx');
@unlink($conf['indexdir'].'/pageword.idx');
@unlink($conf['indexdir'].'/metadata.idx');
$dir = @opendir($conf['indexdir']);
if($dir!==false){
while(($f = readdir($dir)) !== false){
if(substr($f,-4)=='.idx' &&
(substr($f,0,1)=='i' || substr($f,0,1)=='w'
|| substr($f,-6)=='_w.idx' || substr($f,-6)=='_i.idx' || substr($f,-6)=='_p.idx'))
@unlink($conf['indexdir']."/$f");
}
}
@unlink($conf['indexdir'].'/lengths.idx');
// clear the pid cache
$this->pidCache = array();
$this->unlock();
return true;
}
/**
* Split the text into words for fulltext search
*
* TODO: does this also need &$stopwords ?
*
* @triggers INDEXER_TEXT_PREPARE
* This event allows plugins to modify the text before it gets tokenized.
* Plugins intercepting this event should also intercept INDEX_VERSION_GET
*
* @param string $text plain text
* @param boolean $wc are wildcards allowed?
* @return array list of words in the text
* @author Tom N Harris <tnharris@whoopdedo.org>
* @author Andreas Gohr <andi@splitbrain.org>
*/
public function tokenizer($text, $wc=false) {
$wc = ($wc) ? '' : '\*';
$stopwords =& idx_get_stopwords();
// prepare the text to be tokenized
$evt = new Doku_Event('INDEXER_TEXT_PREPARE', $text);
if ($evt->advise_before(true)) {
if (preg_match('/[^0-9A-Za-z ]/u', $text)) {
// handle asian chars as single words (may fail on older PHP version)
$asia = @preg_replace('/('.IDX_ASIAN.')/u', ' \1 ', $text);
if (!is_null($asia)) $text = $asia; // recover from regexp falure
}
}
$evt->advise_after();
unset($evt);
$text = strtr($text,
array(
"\r" => ' ',
"\n" => ' ',
"\t" => ' ',
"\xC2\xAD" => '', //soft-hyphen
)
);
if (preg_match('/[^0-9A-Za-z ]/u', $text))
$text = utf8_stripspecials($text, ' ', '\._\-:'.$wc);
$wordlist = explode(' ', $text);
foreach ($wordlist as $i => $word) {
$wordlist[$i] = (preg_match('/[^0-9A-Za-z]/u', $word)) ?
utf8_strtolower($word) : strtolower($word);
}
foreach ($wordlist as $i => $word) {
if ((!is_numeric($word) && strlen($word) < IDX_MINWORDLENGTH)
|| array_search($word, $stopwords) !== false)
unset($wordlist[$i]);
}
return array_values($wordlist);
}
/**
* Get the numeric PID of a page
*
* @param string $page The page to get the PID for
* @return bool|int The page id on success, false on error
*/
public function getPID($page) {
// return PID without locking when it is in the cache
if (isset($this->pidCache[$page])) return $this->pidCache[$page];
if (!$this->lock())
return false;
// load known documents
$pid = $this->getPIDNoLock($page);
if ($pid === false) {
$this->unlock();
return false;
}
$this->unlock();
return $pid;
}
/**
* Get the numeric PID of a page without locking the index.
* Only use this function when the index is already locked.
*
* @param string $page The page to get the PID for
* @return bool|int The page id on success, false on error
*/
protected function getPIDNoLock($page) {
// avoid expensive addIndexKey operation for the most recently requested pages by using a cache
if (isset($this->pidCache[$page])) return $this->pidCache[$page];
$pid = $this->addIndexKey('page', '', $page);
// limit cache to 10 entries by discarding the oldest element as in DokuWiki usually only the most recently
// added item will be requested again
if (count($this->pidCache) > 10) array_shift($this->pidCache);
$this->pidCache[$page] = $pid;
return $pid;
}
/**
* Get the page id of a numeric PID
*
* @param int $pid The PID to get the page id for
* @return string The page id
*/
public function getPageFromPID($pid) {
return $this->getIndexKey('page', '', $pid);
}
/**
* Find pages in the fulltext index containing the words,
*
* The search words must be pre-tokenized, meaning only letters and
* numbers with an optional wildcard
*
* The returned array will have the original tokens as key. The values
* in the returned list is an array with the page names as keys and the
* number of times that token appears on the page as value.
*
* @param array $tokens list of words to search for
* @return array list of page names with usage counts
* @author Tom N Harris <tnharris@whoopdedo.org>
* @author Andreas Gohr <andi@splitbrain.org>
*/
public function lookup(&$tokens) {
$result = array();
$wids = $this->getIndexWords($tokens, $result);
if (empty($wids)) return array();
// load known words and documents
$page_idx = $this->getIndex('page', '');
$docs = array();
foreach (array_keys($wids) as $wlen) {
$wids[$wlen] = array_unique($wids[$wlen]);
$index = $this->getIndex('i', $wlen);
foreach($wids[$wlen] as $ixid) {
if ($ixid < count($index))
$docs["$wlen*$ixid"] = $this->parseTuples($page_idx, $index[$ixid]);
}
}
// merge found pages into final result array
$final = array();
foreach ($result as $word => $res) {
$final[$word] = array();
foreach ($res as $wid) {
// handle the case when ($ixid < count($index)) has been false
// and thus $docs[$wid] hasn't been set.
if (!isset($docs[$wid])) continue;
$hits = &$docs[$wid];
foreach ($hits as $hitkey => $hitcnt) {
// make sure the document still exists
if (!page_exists($hitkey, '', false)) continue;
if (!isset($final[$word][$hitkey]))
$final[$word][$hitkey] = $hitcnt;
else
$final[$word][$hitkey] += $hitcnt;
}
}
}
return $final;
}
/**
* Find pages containing a metadata key.
*
* The metadata values are compared as case-sensitive strings. Pass a
* callback function that returns true or false to use a different
* comparison function. The function will be called with the $value being
* searched for as the first argument, and the word in the index as the
* second argument. The function preg_match can be used directly if the
* values are regexes.
*
* @param string $key name of the metadata key to look for
* @param string $value search term to look for, must be a string or array of strings
* @param callback $func comparison function
* @return array lists with page names, keys are query values if $value is array
* @author Tom N Harris <tnharris@whoopdedo.org>
* @author Michael Hamann <michael@content-space.de>
*/
public function lookupKey($key, &$value, $func=null) {
if (!is_array($value))
$value_array = array($value);
else
$value_array =& $value;
// the matching ids for the provided value(s)
$value_ids = array();
$metaname = idx_cleanName($key);
// get all words in order to search the matching ids
if ($key == 'title') {
$words = $this->getIndex('title', '');
} else {
$words = $this->getIndex($metaname.'_w', '');
}
if (!is_null($func)) {
foreach ($value_array as $val) {
foreach ($words as $i => $word) {
if (call_user_func_array($func, array($val, $word)))
$value_ids[$i][] = $val;
}
}
} else {
foreach ($value_array as $val) {
$xval = $val;
$caret = '^';
$dollar = '$';
// check for wildcards
if (substr($xval, 0, 1) == '*') {
$xval = substr($xval, 1);
$caret = '';
}
if (substr($xval, -1, 1) == '*') {
$xval = substr($xval, 0, -1);
$dollar = '';
}
if (!$caret || !$dollar) {
$re = $caret.preg_quote($xval, '/').$dollar;
foreach(array_keys(preg_grep('/'.$re.'/', $words)) as $i)
$value_ids[$i][] = $val;
} else {
if (($i = array_search($val, $words)) !== false)
$value_ids[$i][] = $val;
}
}
}
unset($words); // free the used memory
// initialize the result so it won't be null
$result = array();
foreach ($value_array as $val) {
$result[$val] = array();
}
$page_idx = $this->getIndex('page', '');
// Special handling for titles
if ($key == 'title') {
foreach ($value_ids as $pid => $val_list) {
$page = $page_idx[$pid];
foreach ($val_list as $val) {
$result[$val][] = $page;
}
}
} else {
// load all lines and pages so the used lines can be taken and matched with the pages
$lines = $this->getIndex($metaname.'_i', '');
foreach ($value_ids as $value_id => $val_list) {
// parse the tuples of the form page_id*1:page2_id*1 and so on, return value
// is an array with page_id => 1, page2_id => 1 etc. so take the keys only
$pages = array_keys($this->parseTuples($page_idx, $lines[$value_id]));
foreach ($val_list as $val) {
$result[$val] = array_merge($result[$val], $pages);
}
}
}
if (!is_array($value)) $result = $result[$value];
return $result;
}
/**
* Find the index ID of each search term.
*
* The query terms should only contain valid characters, with a '*' at
* either the beginning or end of the word (or both).
* The $result parameter can be used to merge the index locations with
* the appropriate query term.
*
* @param array $words The query terms.
* @param array $result Set to word => array("length*id" ...)
* @return array Set to length => array(id ...)
* @author Tom N Harris <tnharris@whoopdedo.org>
*/
protected function getIndexWords(&$words, &$result) {
$tokens = array();
$tokenlength = array();
$tokenwild = array();
foreach ($words as $word) {
$result[$word] = array();
$caret = '^';
$dollar = '$';
$xword = $word;
$wlen = wordlen($word);
// check for wildcards
if (substr($xword, 0, 1) == '*') {
$xword = substr($xword, 1);
$caret = '';
$wlen -= 1;
}
if (substr($xword, -1, 1) == '*') {
$xword = substr($xword, 0, -1);
$dollar = '';
$wlen -= 1;
}
if ($wlen < IDX_MINWORDLENGTH && $caret && $dollar && !is_numeric($xword))
continue;
if (!isset($tokens[$xword]))
$tokenlength[$wlen][] = $xword;
if (!$caret || !$dollar) {
$re = $caret.preg_quote($xword, '/').$dollar;
$tokens[$xword][] = array($word, '/'.$re.'/');
if (!isset($tokenwild[$xword]))
$tokenwild[$xword] = $wlen;
} else {
$tokens[$xword][] = array($word, null);
}
}
asort($tokenwild);
// $tokens = array( base word => array( [ query term , regexp ] ... ) ... )
// $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 = $this->indexLengths($length_filter);
if (!empty($tokenwild)) sort($indexes_known);
// get word IDs
$wids = array();
foreach ($indexes_known as $ixlen) {
$word_idx = $this->getIndex('w', $ixlen);
// handle exact search
if (isset($tokenlength[$ixlen])) {
foreach ($tokenlength[$ixlen] as $xword) {
$wid = array_search($xword, $word_idx);
if ($wid !== false) {
$wids[$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;
}
/**
* Return a list of all pages
* Warning: pages may not exist!
*
* @param string $key list only pages containing the metadata key (optional)
* @return array list of page names
* @author Tom N Harris <tnharris@whoopdedo.org>
*/
public function getPages($key=null) {
$page_idx = $this->getIndex('page', '');
if (is_null($key)) return $page_idx;
$metaname = idx_cleanName($key);
// Special handling for titles
if ($key == 'title') {
$title_idx = $this->getIndex('title', '');
array_splice($page_idx, count($title_idx));
foreach ($title_idx as $i => $title)
if ($title === "") unset($page_idx[$i]);
return array_values($page_idx);
7F1F
}
$pages = array();
$lines = $this->getIndex($metaname.'_i', '');
foreach ($lines as $line) {
$pages = array_merge($pages, $this->parseTuples($page_idx, $line));
}
return array_keys($pages);
}
/**
* Return a list of words sorted by number of times used
*
* @param int $min bottom frequency threshold
* @param int $max upper frequency limit. No limit if $max<$min
* @param int $minlen minimum length of words to count
* @param string $key metadata key to list. Uses the fulltext index if not given
* @return array list of words as the keys and frequency as values
* @author Tom N Harris <tnharris@whoopdedo.org>
*/
public function histogram($min=1, $max=0, $minlen=3, $key=null) {
if ($min < 1)
$min = 1;
if ($max < $min)
$max = 0;
$result = array();
if ($key == 'title') {
$index = $this->getIndex('title', '');
$index = array_count_values($index);
foreach ($index as $val => $cnt) {
if ($cnt >= $min && (!$max || $cnt <= $max) && strlen($val) >= $minlen)
$result[$val] = $cnt;
}
}
elseif (!is_null($key)) {
$metaname = idx_cleanName($key);
$index = $this->getIndex($metaname.'_i', '');
$val_idx = array();
foreach ($index as $wid => $line) {
$freq = $this->countTuples($line);
if ($freq >= $min && (!$max || $freq <= $max))
$val_idx[$wid] = $freq;
}
if (!empty($val_idx)) {
$words = $this->getIndex($metaname.'_w', '');
foreach ($val_idx as $wid => $freq) {
if (strlen($words[$wid]) >= $minlen)
$result[$words[$wid]] = $freq;
}
}
}
else {
$lengths = idx_listIndexLengths();
foreach ($lengths as $length) {
if ($length < $minlen) continue;
$index = $this->getIndex('i', $length);
$words = null;
foreach ($index as $wid => $line) {
$freq = $this->countTuples($line);
if ($freq >= $min && (!$max || $freq <= $max)) {
if ($words === null)
$words = $this->getIndex('w', $length);
$result[$words[$wid]] = $freq;
}
}
}
}
arsort($result);
return $result;
}
/**
* Lock the indexer.
*
* @author Tom N Harris <tnharris@whoopdedo.org>
*/
protected function lock() {