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1004 lines (913 loc) · 31.6 KB
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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>
*/
use dokuwiki\Utf8\Asian;
use dokuwiki\Search\Indexer;
use dokuwiki\Extension\Event;
use dokuwiki\Utf8\Clean;
use dokuwiki\Utf8\PhpString;
use dokuwiki\Utf8\Sort;
/**
* create snippets for the first few results only
*/
if (!defined('FT_SNIPPET_NUMBER')) define('FT_SNIPPET_NUMBER', 15);
/**
* The fulltext search
*
* Returns a list of matching documents for the given query
*
* refactored into ft_pageSearch(), _ft_pageSearch() and trigger_event()
*
* @param string $query
* @param array $highlight
* @param string $sort
* @param int|string $after only show results with mtime after this date, accepts timestap or strtotime arguments
* @param int|string $before only show results with mtime before this date, accepts timestap or strtotime arguments
*
* @return array
*/
function ft_pageSearch($query, &$highlight, $sort = null, $after = null, $before = null)
{
if ($sort === null) {
$sort = 'hits';
}
$data = [
'query' => $query,
'sort' => $sort,
'after' => $after,
'before' => $before
];
$data['highlight'] =& $highlight;
return Event::createAndTrigger('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>
*
* @param array $data event data
* @return array matching documents
*/
function _ft_pageSearch(&$data)
{
$Indexer = idx_get_indexer();
// parse the given query
$q = ft_queryParser($Indexer, $data['query']);
$data['highlight'] = $q['highlight'];
if (empty($q['parsed_ary'])) return [];
// lookup all words found in the query
$lookup = $Indexer->lookup($q['words']);
// get all pages in this dokuwiki site (!: includes nonexistent pages)
$pages_all = [];
foreach ($Indexer->getPages() as $id) {
$pages_all[$id] = 0; // base: 0 hit
}
// process the query
$stack = [];
foreach ($q['parsed_ary'] as $token) {
switch (substr($token, 0, 3)) {
case 'W+:':
case 'W-:':
case 'W_:': // word
$word = substr($token, 3);
if (isset($lookup[$word])) {
$stack[] = (array)$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 at the pages that contain
// all words in this phrase
$pages = $stack ? end($stack) : [];
$pages_matched = [];
foreach (array_keys($pages) as $id) {
$evdata = [
'id' => $id,
'phrase' => $phrase,
'text' => rawWiki($id)
];
$evt = new Event('FULLTEXT_PHRASE_MATCH', $evdata);
if ($evt->advise_before() && $evt->result !== true) {
$text = PhpString::strtolower($evdata['text']);
if (strpos($text, $phrase) !== false) {
$evt->result = true;
}
}
$evt->advise_after();
if ($evt->result === true) {
$pages_matched[$id] = 0; // phrase: always 0 hit
}
}
$stack[] = $pages_matched;
break;
case 'N+:':
case 'N-:': // namespace
$ns = cleanID(substr($token, 3)) . ':';
$pages_matched = [];
foreach (array_keys($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
$pages = array_splice($stack, -2);
if ($pages === []) {
break;
}
$stack[] = ft_resultCombine($pages);
break;
case 'OR': // or operation
$pages = array_splice($stack, -2);
if ($pages === []) {
break;
}
$stack[] = ft_resultUnite($pages);
break;
case 'NOT': // not operation (unary)
$pages = array_pop($stack);
$stack[] = ft_resultComplement([$pages_all, $pages]);
break;
}
}
$docs = array_pop($stack);
if (empty($docs)) return [];
// check: settings, acls, existence
foreach (array_keys($docs) as $id) {
if (isHiddenPage($id) || auth_quickaclcheck($id) < AUTH_READ || !page_exists($id, '', false)) {
unset($docs[$id]);
}
}
$docs = _ft_filterResultsByTime($docs, $data['after'], $data['before']);
if ($data['sort'] === 'mtime') {
uksort($docs, 'ft_pagemtimesorter');
} else {
// sort docs by count
uksort($docs, 'ft_pagesorter');
arsort($docs);
}
return $docs;
}
/**
* Returns the backlinks for a given page
*
* Uses the metadata index.
*
* @param string $id The id for which links shall be returned
* @param bool $ignore_perms Ignore the fact that pages are hidden or read-protected
* @return array The pages that contain links to the given page
*/
function ft_backlinks($id, $ignore_perms = false)
{
$result = idx_get_indexer()->lookupKey('relation_references', $id);
if ($result === []) return $result;
// check ACL permissions
foreach (array_keys($result) as $idx) {
if (
(!$ignore_perms && (
isHiddenPage($result[$idx]) || auth_quickaclcheck($result[$idx]) < AUTH_READ
)) || !page_exists($result[$idx], '', false)
) {
unset($result[$idx]);
}
}
Sort::sort($result);
return $result;
}
/**
* Returns the pages that use a given media file
*
* Uses the relation media metadata property and the metadata index.
*
* Note that before 2013-07-31 the second parameter was the maximum number of results and
* permissions were ignored. That's why the parameter is now checked to be explicitely set
* to true (with type bool) in order to be compatible with older uses of the function.
*
* @param string $id The media id to look for
* @param bool $ignore_perms Ignore hidden pages and acls (optional, default: false)
* @return array A list of pages that use the given media file
*/
function ft_mediause($id, $ignore_perms = false)
{
$result = idx_get_indexer()->lookupKey('relation_media', $id);
if ($result === []) return $result;
// check ACL permissions
foreach (array_keys($result) as $idx) {
if (
(!$ignore_perms && (
isHiddenPage($result[$idx]) || auth_quickaclcheck($result[$idx]) < AUTH_READ
)) || !page_exists($result[$idx], '', false)
) {
unset($result[$idx]);
}
}
Sort::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.
* The third parameter allows to search in titles as well.
*
* The function always returns titles as well
*
* @triggers SEARCH_QUERY_PAGELOOKUP
* @author Andreas Gohr <andi@splitbrain.org>
* @author Adrian Lang <lang@cosmocode.de>
*
* @param string $id page id
* @param bool $in_ns match against namespace as well?
* @param bool $in_title search in title?
* @param int|string $after only show results with mtime after this date, accepts timestap or strtotime arguments
* @param int|string $before only show results with mtime before this date, accepts timestap or strtotime arguments
*
* @return string[]
*/
function ft_pageLookup($id, $in_ns = false, $in_title = false, $after = null, $before = null)
{
$data = [
'id' => $id,
'in_ns' => $in_ns,
'in_title' => $in_title,
'after' => $after,
'before' => $before
];
$data['has_titles'] = true; // for plugin backward compatibility check
return Event::createAndTrigger('SEARCH_QUERY_PAGELOOKUP', $data, '_ft_pageLookup');
}
/**
* Returns list of pages as array(pageid => First Heading)
*
* @param array &$data event data
* @return string[]
*/
function _ft_pageLookup(&$data)
{
// split out original parameters
$id = $data['id'];
$Indexer = idx_get_indexer();
$parsedQuery = ft_queryParser($Indexer, $id);
if (count($parsedQuery['ns']) > 0) {
$ns = cleanID($parsedQuery['ns'][0]) . ':';
$id = implode(' ', $parsedQuery['highlight']);
}
if (count($parsedQuery['notns']) > 0) {
$notns = cleanID($parsedQuery['notns'][0]) . ':';
$id = implode(' ', $parsedQuery['highlight']);
}
$in_ns = $data['in_ns'];
$in_title = $data['in_title'];
$cleaned = cleanID($id);
$Indexer = idx_get_indexer();
$page_idx = $Indexer->getPages();
$pages = [];
if ($id !== '' && $cleaned !== '') {
foreach ($page_idx as $p_id) {
if ((strpos($in_ns ? $p_id : noNSorNS($p_id), $cleaned) !== false)) {
if (!isset($pages[$p_id]))
$pages[$p_id] = p_get_first_heading($p_id, METADATA_DONT_RENDER);
}
}
if ($in_title) {
foreach ($Indexer->lookupKey('title', $id, '_ft_pageLookupTitleCompare') as $p_id) {
if (!isset($pages[$p_id]))
$pages[$p_id] = p_get_first_heading($p_id, METADATA_DONT_RENDER);
}
}
}
if (isset($ns)) {
foreach (array_keys($pages) as $p_id) {
if (strpos($p_id, $ns) !== 0) {
unset($pages[$p_id]);
}
}
}
if (isset($notns)) {
foreach (array_keys($pages) as $p_id) {
if (strpos($p_id, $notns) === 0) {
unset($pages[$p_id]);
}
}
}
// discard hidden pages
// discard nonexistent pages
// check ACL permissions
foreach (array_keys($pages) as $idx) {
if (
!isVisiblePage($idx) || !page_exists($idx) ||
auth_quickaclcheck($idx) < AUTH_READ
) {
unset($pages[$idx]);
}
}
$pages = _ft_filterResultsByTime($pages, $data['after'], $data['before']);
uksort($pages, 'ft_pagesorter');
return $pages;
}
/**
* @param array $results search results in the form pageid => value
* @param int|string $after only returns results with mtime after this date, accepts timestap or strtotime arguments
* @param int|string $before only returns results with mtime after this date, accepts timestap or strtotime arguments
*
* @return array
*/
function _ft_filterResultsByTime(array $results, $after, $before)
{
if ($after || $before) {
$after = is_int($after) ? $after : strtotime($after);
$before = is_int($before) ? $before : strtotime($before);
foreach (array_keys($results) as $id) {
$mTime = filemtime(wikiFN($id));
if ($after && $after > $mTime) {
unset($results[$id]);
continue;
}
if ($before && $before < $mTime) {
unset($results[$id]);
}
}
}
return $results;
}
/**
* Tiny helper function for comparing the searched title with the title
* from the search index. This function is a wrapper around stripos with
* adapted argument order and return value.
*
* @param string $search searched title
* @param string $title title from index
* @return bool
*/
function _ft_pageLookupTitleCompare($search, $title)
{
if (Clean::isASCII($search)) {
$pos = stripos($title, $search);
} else {
$pos = PhpString::strpos(
PhpString::strtolower($title),
PhpString::strtolower($search)
);
}
return $pos !== false;
}
/**
* Sort pages based on their namespace level first, then on their string
* values. This makes higher hierarchy pages rank higher than lower hierarchy
* pages.
*
* @param string $a
* @param string $b
* @return int Returns < 0 if $a is less than $b; > 0 if $a is greater than $b, and 0 if they are equal.
*/
function ft_pagesorter($a, $b)
{
$ac = count(explode(':', $a));
$bc = count(explode(':', $b));
if ($ac < $bc) {
return -1;
} elseif ($ac > $bc) {
return 1;
}
return Sort::strcmp($a, $b);
}
/**
* Sort pages by their mtime, from newest to oldest
*
* @param string $a
* @param string $b
*
* @return int Returns < 0 if $a is newer than $b, > 0 if $b is newer than $a and 0 if they are of the same age
*/
function ft_pagemtimesorter($a, $b)
{
$mtimeA = filemtime(wikiFN($a));
$mtimeB = filemtime(wikiFN($b));
return $mtimeB - $mtimeA;
}
/**
* Creates a snippet extract
*
* @author Andreas Gohr <andi@splitbrain.org>
* @triggers FULLTEXT_SNIPPET_CREATE
*
* @param string $id page id
* @param array $highlight
* @return mixed
*/
function ft_snippet($id, $highlight)
{
$text = rawWiki($id);
$text = str_replace("\xC2\xAD", '', $text);
// remove soft-hyphens
$evdata = [
'id' => $id,
'text' => &$text,
'highlight' => &$highlight,
'snippet' => ''
];
$evt = new Event('FULLTEXT_SNIPPET_CREATE', $evdata);
if ($evt->advise_before()) {
$match = [];
$snippets = [];
$utf8_offset = 0;
$offset = 0;
$end = 0;
$len = PhpString::strlen($text);
// build a regexp from the phrases to highlight
$re1 = '(' .
implode(
'|',
array_map(
'ft_snippet_re_preprocess',
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) {
} elseif (preg_match('/' . $re3 . '/iu', $text, $match, PREG_OFFSET_CAPTURE, $offset)) {
} elseif (preg_match('/' . $re2 . '/iu', $text, $match, PREG_OFFSET_CAPTURE, $offset)) {
} elseif (preg_match('/' . $re1 . '/iu', $text, $match, PREG_OFFSET_CAPTURE, $offset)) {
} else {
break;
}
[$str, $idx] = $match[0];
// convert $idx (a byte offset) into a utf8 character offset
$utf8_idx = PhpString::strlen(substr($text, 0, $idx));
$utf8_len = PhpString::strlen($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 = 50;
$post = 50;
} elseif ($pre > 50) {
$pre = min($pre, 100 - $post);
} elseif ($post > 50) {
$post = min($post, 100 - $pre);
} elseif ($offset == 0) {
// 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
$snippets = [$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] .= PhpString::substr($text, $append, $end - $append);
} else {
$snippets[] = PhpString::substr($text, $start, $end - $start);
}
// set $offset for next match attempt
// continue matching after the current match
// if the current match is not the longest possible match starting at the current offset
// this prevents further matching of this snippet but for possible matches of length
// smaller than match length + context (at least 50 characters) this match is part of the context
$utf8_offset = $utf8_idx + $utf8_len;
$offset = $idx + strlen(PhpString::substr($text, $utf8_idx, $utf8_len));
$offset = Clean::correctIdx($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(implode('... ', $snippets))
);
$evdata['snippet'] = $snippet;
}
$evt->advise_after();
unset($evt);
return $evdata['snippet'];
}
/**
* Wraps a search term in regex boundary checks.
*
* @param string $term
* @return string
*/
function ft_snippet_re_preprocess($term)
{
// do not process asian terms where word boundaries are not explicit
if (Asian::isAsianWords($term)) return $term;
if (UTF8_PROPERTYSUPPORT) {
// unicode word boundaries
// see http://stackoverflow.com/a/2449017/172068
$BL = '(?<!\pL)';
$BR = '(?!\pL)';
} else {
// not as correct as above, but at least won't break
$BL = '\b';
$BR = '\b';
}
if (str_starts_with($term, '\\*')) {
$term = substr($term, 2);
} else {
$term = $BL . $term;
}
if (str_ends_with($term, '\\*')) {
$term = substr($term, 0, -2);
} else {
$term .= $BR;
}
if ($term == $BL || $term == $BR || $term == $BL . $BR) $term = '';
return $term;
}
/**
* 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 $args An array of page arrays
* @return array
*/
function ft_resultCombine($args)
{
$array_count = count($args);
if ($array_count == 1) {
return $args[0];
}
$result = [];
if ($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 $args An array of page arrays
* @return array
*
* @author Kazutaka Miyasaka <kazmiya@gmail.com>
*/
function ft_resultUnite($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 $id) {
if (isset($result[$id])) {
$result[$id] += $args[$i][$id];
} else {
$result[$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 $args An array of page arrays
* @return array
*
* @author Kazutaka Miyasaka <kazmiya@gmail.com>
*/
function ft_resultComplement($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>
*
* @param Indexer $Indexer
* @param string $query search query
* @return array of search formulas
*/
function ft_queryParser($Indexer, $query)
{
/**
* 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;
$terms = preg_split(
'/(-?".*?")/u',
PhpString::strtolower($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 = $not . ft_termParser($Indexer, $matches[2], 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
$parsed .= 'NOT(' . ft_termParser($Indexer, $matches[1]) . &
FCDD
#039;)';
} else {
// word-include
$parsed .= ft_termParser($Indexer, $token);
}
}
}
$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 = [];
$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 = [];
$ope_stack = [];
$ope_precedence = [')' => 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 ($last_ope !== false && $ope_precedence[$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(['OP', 'CP'], ['(', ')'], $token);
$parsed_ary[] = $token_decoded;
}
}
$parsed_ary = array_values([...$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 = [];
$q['query'] = $query;
$q['parsed_str'] = $parsed_query;
$q['parsed_ary'] = $parsed_ary;
foreach ($q['parsed_ary'] as $token) {
if (strlen($token) < 3 || $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'][] = $body;
$q['and'][] = $body; // for backward compatibility
break;
case 'P-:':
$q['phrases'][] = $body;
break;
case 'P+:':
$q['phrases'][] = $body;
$q['highlight'][] = $body;
break;
}
}
foreach (['words', 'phrases', 'highlight', 'ns', 'notns', 'and', 'not'] as $key) {
$q[$key] = empty($q[$key]) ? [] : 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>
*
* @param Indexer $Indexer
* @param string $term
* @param bool $consider_asian
* @param bool $phrase_mode
* @return string
*/
function ft_termParser($Indexer, $term, $consider_asian = true, $phrase_mode = false)
{
$parsed = '';
if ($consider_asian) {
// successive asian characters need to be searched as a phrase
$words = Asian::splitAsianWords($term);
foreach ($words as $word) {
$phrase_mode = $phrase_mode ? true : Asian::isAsianWords($word);
$parsed .= ft_termParser($Indexer, $word, false, $phrase_mode);
}
} else {
$term_noparen = str_replace(['(', ')'], ' ', $term);
$words = $Indexer->tokenizer($term_noparen, 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(['(', ')'], ['OP', 'CP'], $term);
$parsed = '((W_:' . implode(')(W_:', $words) . ')(P+:' . $term_encoded . '))';
} else {
$parsed = '((W+:' . implode(')(W+:', $words) . '))';
}
}
return $parsed;
}
/**
* Recreate a search query string based on parsed parts, doesn't support negated phrases and `OR` searches
*
* @param array $and
* @param array $not
* @param array $phrases
* @param array $ns
* @param array $notns
*
* @return string
*/
function ft_queryUnparser_simple(array $and, array $not, array $phrases, array $ns, array $notns)
{
$query = implode(' ', $and);
if ($not !== []) {
$query .= ' -' . implode(' -', $not);
}
if ($phrases !== []) {
$query .= ' "' . implode('" "', $phrases) . '"';
}
if ($ns !== []) {
$query .= ' @' . implode(' @', $ns);
}
if ($notns !== []) {
$query .= ' ^' . implode(' ^', $notns);
}