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Forum searching is now implemented using a lex-based method, which allows

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extra capabilities such as:

  - "phrase searching"
  - user matching:    user:tony
  - subject matching: subject:thing

This code is all from Tony Hursh.   THANKS TONY!!
This commit is contained in:
moodler 2005-01-31 07:41:47 +00:00
parent 792a590da7
commit 855c0839fc
1 changed files with 19 additions and 27 deletions
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40
mod/forum/lib.php
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@ -969,6 +969,7 @@ function forum_search_posts($searchterms, $courseid, $page=0, $recordsperpage=50
///
global $CFG;
require_once($CFG->libdir.'/searchlib.php');
if (!isteacher($courseid)) {
$notteacherforum = "AND f.type <> 'teacher'";
@ -1008,39 +1009,30 @@ function forum_search_posts($searchterms, $courseid, $page=0, $recordsperpage=50
}
$messagesearch = "";
$subjectsearch = "";
foreach ($searchterms as $searchterm) {
if (strlen($searchterm) < 2) {
continue;
$searchstring = "";
// Need to concat these back together for parser to work.
foreach($searchterms as $searchterm){
if ($searchstring != "") {
$searchstring .= " ";
}
if ($messagesearch) {
$messagesearch .= " AND ";
}
if ($subjectsearch) {
$subjectsearch .= " AND ";
$searchstring .= $searchterm;
}
if (substr($searchterm,0,1) == "+") {
$searchterm = substr($searchterm,1);
$messagesearch .= " p.message $REGEXP '(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)' ";
$subjectsearch .= " p.subject $REGEXP '(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)' ";
} else if (substr($searchterm,0,1) == "-") {
$searchterm = substr($searchterm,1);
$messagesearch .= " p.message $NOTREGEXP '(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)' ";
$subjectsearch .= " p.subject $NOTREGEXP '(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)' ";
} else {
$messagesearch .= " p.message $LIKE '%$searchterm%' ";
$subjectsearch .= " p.subject $LIKE '%$searchterm%' ";
}
// We need to allow quoted strings for the search. The quotes *should* be stripped
// by the parser, but this should be examined carefully for security implications.
$searchstring = str_replace("\\\"","\"",$searchstring);
$parser = new search_parser();
$lexer = new search_lexer(&$parser);
if ($lexer->parse($searchstring)) {
$parsearray = $parser->get_parsed_array();
$messagesearch = search_generate_SQL($parsearray,"p.message","p.subject","p.userid","u.id","u.firstname","u.lastname");
}
$selectsql = "{$CFG->prefix}forum_posts p,
{$CFG->prefix}forum_discussions d,
{$CFG->prefix}user u,
{$CFG->prefix}forum f $onlyvisibletable
WHERE ($messagesearch OR $subjectsearch)
WHERE ($messagesearch)
AND p.userid = u.id
AND p.discussion = d.id
AND d.course = '$courseid'