2 rcs_id('$Id: WikiDB.php,v 1.32 2004-02-12 11:25:53 rurban Exp $');
4 require_once('lib/stdlib.php');
5 require_once('lib/PageType.php');
7 //FIXME: arg on get*Revision to hint that content is wanted.
10 * The classes in the file define the interface to the
14 * @author Geoffrey T. Dairiki <dairiki@dairiki.org>
18 * Force the creation of a new revision.
19 * @see WikiDB_Page::createRevision()
21 define('WIKIDB_FORCE_CREATE', -1);
23 // FIXME: used for debugging only. Comment out if cache does not work
24 define('USECACHE', 1);
27 * Abstract base class for the database used by PhpWiki.
29 * A <tt>WikiDB</tt> is a container for <tt>WikiDB_Page</tt>s which in
30 * turn contain <tt>WikiDB_PageRevision</tt>s.
32 * Conceptually a <tt>WikiDB</tt> contains all possible
33 * <tt>WikiDB_Page</tt>s, whether they have been initialized or not.
34 * Since all possible pages are already contained in a WikiDB, a call
35 * to WikiDB::getPage() will never fail (barring bugs and
36 * e.g. filesystem or SQL database problems.)
38 * Also each <tt>WikiDB_Page</tt> always contains at least one
39 * <tt>WikiDB_PageRevision</tt>: the default content (e.g. "Describe
40 * [PageName] here."). This default content has a version number of
43 * <tt>WikiDB_PageRevision</tt>s have read-only semantics. One can
44 * only create new revisions or delete old ones --- one can not modify
45 * an existing revision.
49 * Open a WikiDB database.
51 * This is a static member function. This function inspects its
52 * arguments to determine the proper subclass of WikiDB to
53 * instantiate, and then it instantiates it.
57 * @param hash $dbparams Database configuration parameters.
58 * Some pertinent paramters are:
61 * <dd> The back-end type. Current supported types are:
64 * <dd> Generic SQL backend based on the PEAR/DB database abstraction
67 * <dd> Dba based backend.
71 * <dd> (Used by the SQL backend.)
72 * The DSN specifying which database to connect to.
75 * <dd> Prefix to be prepended to database table (and file names).
78 * <dd> (Used by the dba backend.)
79 * Which directory db files reside in.
82 * <dd> (Used by the dba backend.)
83 * Timeout in seconds for opening (and obtaining lock) on the
87 * <dd> (Used by the dba backend.)
89 * Which dba handler to use. Good choices are probably either
93 * @return WikiDB A WikiDB object.
95 function open ($dbparams) {
96 $dbtype = $dbparams{'dbtype'};
97 include_once("lib/WikiDB/$dbtype.php");
99 $class = 'WikiDB_' . $dbtype;
100 return new $class ($dbparams);
110 function WikiDB (&$backend, $dbparams) {
111 $this->_backend = &$backend;
112 $this->_cache = new WikiDB_cache($backend);
114 // If the database doesn't yet have a timestamp, initialize it now.
115 if ($this->get('_timestamp') === false)
118 //FIXME: devel checking.
119 //$this->_backend->check();
123 * Get any user-level warnings about this WikiDB.
125 * Some back-ends, e.g. by default create there data files in the
126 * global /tmp directory. We would like to warn the user when this
127 * happens (since /tmp files tend to get wiped periodically.)
128 * Warnings such as these may be communicated from specific
129 * back-ends through this method.
133 * @return string A warning message (or <tt>false</tt> if there is
136 function genericWarnings() {
141 * Close database connection.
143 * The database may no longer be used after it is closed.
145 * Closing a WikiDB invalidates all <tt>WikiDB_Page</tt>s,
146 * <tt>WikiDB_PageRevision</tt>s and <tt>WikiDB_PageIterator</tt>s
147 * which have been obtained from it.
152 $this->_backend->close();
153 $this->_cache->close();
157 * Get a WikiDB_Page from a WikiDB.
159 * A {@link WikiDB} consists of the (infinite) set of all possible pages,
160 * therefore this method never fails.
163 * @param string $pagename Which page to get.
164 * @return WikiDB_Page The requested WikiDB_Page.
166 function getPage($pagename) {
167 assert(is_string($pagename) && $pagename);
168 return new WikiDB_Page($this, $pagename);
173 //function nPages() {
178 * Determine whether page exists (in non-default form).
181 * $is_page = $dbi->isWikiPage($pagename);
185 * $page = $dbi->getPage($pagename);
186 * $current = $page->getCurrentRevision();
187 * $is_page = ! $current->hasDefaultContents();
189 * however isWikiPage may be implemented in a more efficient
190 * manner in certain back-ends.
194 * @param string $pagename string Which page to check.
196 * @return boolean True if the page actually exists with
197 * non-default contents in the WikiDataBase.
199 function isWikiPage ($pagename) {
200 $page = $this->getPage($pagename);
201 $current = $page->getCurrentRevision();
202 return ! $current->hasDefaultContents();
206 * Delete page from the WikiDB.
208 * Deletes all revisions of the page from the WikiDB. Also resets
209 * all page meta-data to the default values.
213 * @param string $pagename Name of page to delete.
215 function deletePage($pagename) {
216 $this->_cache->delete_page($pagename);
220 * Retrieve all pages.
222 * Gets the set of all pages with non-default contents.
224 * FIXME: do we need this? I think so. The simple searches
229 * @param boolean $include_defaulted Normally pages whose most
230 * recent revision has empty content are considered to be
231 * non-existant. Unless $include_defaulted is set to true, those
232 * pages will not be returned.
234 * @return WikiDB_PageIterator A WikiDB_PageIterator which contains all pages
235 * in the WikiDB which have non-default contents.
237 function getAllPages($include_defaulted = false, $orderby = 'pagename') {
238 $result = $this->_backend->get_all_pages($include_defaulted,$orderby);
239 return new WikiDB_PageIterator($this, $result);
245 * Search for pages containing (or not containing) certain words
248 * Pages are returned in alphabetical order whenever it is
249 * practical to do so.
251 * FIXME: should titleSearch and fullSearch be combined? I think so.
254 * @param TextSearchQuery $search A TextSearchQuery object
255 * @return WikiDB_PageIterator A WikiDB_PageIterator containing the matching pages.
256 * @see TextSearchQuery
258 function titleSearch($search) {
259 $result = $this->_backend->text_search($search);
260 return new WikiDB_PageIterator($this, $result);
266 * Search for pages containing (or not containing) certain words
267 * in their entire text (this includes the page content and the
270 * Pages are returned in alphabetical order whenever it is
271 * practical to do so.
275 * @param TextSearchQuery $search A TextSearchQuery object.
276 * @return WikiDB_PageIterator A WikiDB_PageIterator containing the matching pages.
277 * @see TextSearchQuery
279 function fullSearch($search) {
280 $result = $this->_backend->text_search($search, 'full_text');
281 return new WikiDB_PageIterator($this, $result);
285 * Find the pages with the greatest hit counts.
287 * Pages are returned in reverse order by hit count.
291 * @param integer $limit The maximum number of pages to return.
292 * Set $limit to zero to return all pages. If $limit < 0, pages will
293 * be sorted in decreasing order of popularity.
295 * @return WikiDB_PageIterator A WikiDB_PageIterator containing the matching
298 function mostPopular($limit = 20) {
299 $result = $this->_backend->most_popular($limit);
300 return new WikiDB_PageIterator($this, $result);
304 * Find recent page revisions.
306 * Revisions are returned in reverse order by creation time.
310 * @param hash $params This hash is used to specify various optional
314 * <dd> (integer) At most this many revisions will be returned.
316 * <dd> (integer) Only revisions since this time (unix-timestamp) will be returned.
317 * <dt> include_minor_revisions
318 * <dd> (boolean) Also include minor revisions. (Default is not to.)
319 * <dt> exclude_major_revisions
320 * <dd> (boolean) Don't include non-minor revisions.
321 * (Exclude_major_revisions implies include_minor_revisions.)
322 * <dt> include_all_revisions
323 * <dd> (boolean) Return all matching revisions for each page.
324 * Normally only the most recent matching revision is returned
328 * @return WikiDB_PageRevisionIterator A WikiDB_PageRevisionIterator containing the
329 * matching revisions.
331 function mostRecent($params = false) {
332 $result = $this->_backend->most_recent($params);
333 return new WikiDB_PageRevisionIterator($this, $result);
337 * Blog search. (experimental)
339 * Search for blog entries related to a certain page.
341 * FIXME: with pagetype support and perhaps a RegexpSearchQuery
342 * we can make sure we are returning *ONLY* blog pages to the
343 * main routine. Currently, we just use titleSearch which requires
344 * some furher checking in lib/plugin/WikiBlog.php (BAD).
348 * @param string $order 'normal' (chronological) or 'reverse'
349 * @param string $page Find blog entries related to this page.
350 * @return WikiDB_PageIterator A WikiDB_PageIterator containing the relevant pages.
352 // Deleting until such time as this is properly implemented...
353 // (As long as it's just a title search, just use titleSearch.)
354 //function blogSearch($page, $order) {
355 // //FIXME: implement ordering
357 // require_once('lib/TextSearchQuery.php');
358 // $query = new TextSearchQuery ($page . SUBPAGE_SEPARATOR);
360 // return $this->titleSearch($query);
363 /** Get timestamp when database was last modified.
365 * @return string A string consisting of two integers,
366 * separated by a space. The first is the time in
367 * unix timestamp format, the second is a modification
368 * count for the database.
370 * The idea is that you can cast the return value to an
371 * int to get a timestamp, or you can use the string value
372 * as a good hash for the entire database.
374 function getTimestamp() {
375 $ts = $this->get('_timestamp');
376 return sprintf("%d %d", $ts[0], $ts[1]);
380 * Update the database timestamp.
384 $ts = $this->get('_timestamp');
385 $this->set('_timestamp', array(time(), $ts[1] + 1));
390 * Access WikiDB global meta-data.
392 * NOTE: this is currently implemented in a hackish and
393 * not very efficient manner.
397 * @param string $key Which meta data to get.
398 * Some reserved meta-data keys are:
400 * <dt>'_timestamp' <dd> Data used by getTimestamp().
403 * @return scalar The requested value, or false if the requested data
407 if (!$key || $key[0] == '%')
410 * Hack Alert: We can use any page (existing or not) to store
411 * this data (as long as we always use the same one.)
413 $gd = $this->getPage('global_data');
414 $data = $gd->get('__global');
416 if ($data && isset($data[$key]))
423 * Set global meta-data.
425 * NOTE: this is currently implemented in a hackish and
426 * not very efficient manner.
431 * @param string $key Meta-data key to set.
432 * @param string $newval New value.
434 function set($key, $newval) {
435 if (!$key || $key[0] == '%')
438 $gd = $this->getPage('global_data');
440 $data = $gd->get('__global');
447 $data[$key] = $newval;
449 $gd->set('__global', $data);
455 * An abstract base class which representing a wiki-page within a
458 * A WikiDB_Page contains a number (at least one) of
459 * WikiDB_PageRevisions.
463 function WikiDB_Page(&$wikidb, $pagename) {
464 $this->_wikidb = &$wikidb;
465 $this->_pagename = $pagename;
466 assert(!empty($this->_pagename));
470 * Get the name of the wiki page.
474 * @return string The page name.
477 return $this->_pagename;
481 $current = $this->getCurrentRevision();
482 return ! $current->hasDefaultContents();
486 * Delete an old revision of a WikiDB_Page.
488 * Deletes the specified revision of the page.
489 * It is a fatal error to attempt to delete the current revision.
493 * @param integer $version Which revision to delete. (You can also
494 * use a WikiDB_PageRevision object here.)
496 function deleteRevision($version) {
497 $backend = &$this->_wikidb->_backend;
498 $cache = &$this->_wikidb->_cache;
499 $pagename = &$this->_pagename;
501 $version = $this->_coerce_to_version($version);
506 $latestversion = $cache->get_latest_version($pagename);
507 if ($latestversion && $version == $latestversion) {
509 trigger_error(sprintf("Attempt to delete most recent revision of '%s'",
510 $pagename), E_USER_ERROR);
514 $cache->delete_versiondata($pagename, $version);
520 * Delete a revision, or possibly merge it with a previous
524 * Suppose an author make a (major) edit to a page. Shortly
525 * after that the same author makes a minor edit (e.g. to fix
526 * spelling mistakes he just made.)
528 * Now some time later, where cleaning out old saved revisions,
529 * and would like to delete his minor revision (since there's
530 * really no point in keeping minor revisions around for a long
533 * Note that the text after the minor revision probably represents
534 * what the author intended to write better than the text after
535 * the preceding major edit.
537 * So what we really want to do is merge the minor edit with the
540 * We will only do this when:
542 * <li>The revision being deleted is a minor one, and
543 * <li>It has the same author as the immediately preceding revision.
546 function mergeRevision($version) {
547 $backend = &$this->_wikidb->_backend;
548 $cache = &$this->_wikidb->_cache;
549 $pagename = &$this->_pagename;
551 $version = $this->_coerce_to_version($version);
556 $latestversion = $backend->get_latest_version($pagename);
557 if ($latestversion && $version == $latestversion) {
559 trigger_error(sprintf("Attempt to merge most recent revision of '%s'",
560 $pagename), E_USER_ERROR);
564 $versiondata = $cache->get_versiondata($pagename, $version, true);
566 // Not there? ... we're done!
571 if ($versiondata['is_minor_edit']) {
572 $previous = $backend->get_previous_version($pagename, $version);
574 $prevdata = $cache->get_versiondata($pagename, $previous);
575 if ($prevdata['author_id'] == $versiondata['author_id']) {
576 // This is a minor revision, previous version is
577 // by the same author. We will merge the
579 $cache->update_versiondata($pagename, $previous,
580 array('%content' => $versiondata['%content'],
581 '_supplanted' => $versiondata['_supplanted']));
586 $cache->delete_versiondata($pagename, $version);
592 * Create a new revision of a {@link WikiDB_Page}.
596 * @param int $version Version number for new revision.
597 * To ensure proper serialization of edits, $version must be
598 * exactly one higher than the current latest version.
599 * (You can defeat this check by setting $version to
600 * {@link WIKIDB_FORCE_CREATE} --- not usually recommended.)
602 * @param string $content Contents of new revision.
604 * @param hash $metadata Metadata for new revision.
605 * All values in the hash should be scalars (strings or integers).
607 * @param array $links List of pagenames which this page links to.
609 * @return WikiDB_PageRevision Returns the new WikiDB_PageRevision object. If
610 * $version was incorrect, returns false
612 function createRevision($version, &$content, $metadata, $links) {
613 $backend = &$this->_wikidb->_backend;
614 $cache = &$this->_wikidb->_cache;
615 $pagename = &$this->_pagename;
619 $latestversion = $backend->get_latest_version($pagename);
620 $newversion = $latestversion + 1;
621 assert($newversion >= 1);
623 if ($version != WIKIDB_FORCE_CREATE && $version != $newversion) {
630 foreach ($data as $key => $val) {
631 if (empty($val) || $key[0] == '_' || $key[0] == '%')
635 assert(!empty($data['author']));
636 if (empty($data['author_id']))
637 @$data['author_id'] = $data['author'];
639 if (empty($data['mtime']))
640 $data['mtime'] = time();
642 if ($latestversion) {
643 // Ensure mtimes are monotonic.
644 $pdata = $cache->get_versiondata($pagename, $latestversion);
645 if ($data['mtime'] < $pdata['mtime']) {
646 trigger_error(sprintf(_("%s: Date of new revision is %s"),
647 $pagename,"'non-monotonic'"),
649 $data['orig_mtime'] = $data['mtime'];
650 $data['mtime'] = $pdata['mtime'];
653 // FIXME: use (possibly user specified) 'mtime' time or
655 $cache->update_versiondata($pagename, $latestversion,
656 array('_supplanted' => $data['mtime']));
659 $data['%content'] = &$content;
661 $cache->set_versiondata($pagename, $newversion, $data);
663 //$cache->update_pagedata($pagename, array(':latestversion' => $newversion,
664 //':deleted' => empty($content)));
666 $backend->set_links($pagename, $links);
670 return new WikiDB_PageRevision($this->_wikidb, $pagename, $newversion,
674 /** A higher-level interface to createRevision.
676 * This takes care of computing the links, and storing
677 * a cached version of the transformed wiki-text.
679 * @param string $wikitext The page content.
681 * @param int $version Version number for new revision.
682 * To ensure proper serialization of edits, $version must be
683 * exactly one higher than the current latest version.
684 * (You can defeat this check by setting $version to
685 * {@link WIKIDB_FORCE_CREATE} --- not usually recommended.)
687 * @param hash $meta Meta-data for new revision.
689 function save($wikitext, $version, $meta) {
690 $formatted = new TransformedText($this, $wikitext, $meta);
691 $type = $formatted->getType();
692 $meta['pagetype'] = $type->getName();
693 $links = $formatted->getWikiPageLinks();
695 $backend = &$this->_wikidb->_backend;
697 $newrevision = $this->createRevision($version, $wikitext, $meta, $links);
699 if (!defined('WIKIDB_NOCACHE_MARKUP') or !WIKIDB_NOCACHE_MARKUP)
700 $this->set('_cached_html', $formatted->pack());
703 // FIXME: probably should have some global state information
704 // in the backend to control when to optimize.
706 // We're doing this here rather than in createRevision because
707 // postgres can't optimize while locked.
708 if (time() % 50 == 0) {
709 trigger_error(sprintf(_("Optimizing %s"),'backend'), E_USER_NOTICE);
710 $backend->optimize();
713 $newrevision->_transformedContent = $formatted;
718 * Get the most recent revision of a page.
722 * @return WikiDB_PageRevision The current WikiDB_PageRevision object.
724 function getCurrentRevision() {
725 $backend = &$this->_wikidb->_backend;
726 $cache = &$this->_wikidb->_cache;
727 $pagename = &$this->_pagename;
730 $version = $cache->get_latest_version($pagename);
731 $revision = $this->getRevision($version);
738 * Get a specific revision of a WikiDB_Page.
742 * @param integer $version Which revision to get.
744 * @return WikiDB_PageRevision The requested WikiDB_PageRevision object, or
745 * false if the requested revision does not exist in the {@link WikiDB}.
746 * Note that version zero of any page always exists.
748 function getRevision($version) {
749 $cache = &$this->_wikidb->_cache;
750 $pagename = &$this->_pagename;
753 return new WikiDB_PageRevision($this->_wikidb, $pagename, 0);
755 assert($version > 0);
756 $vdata = $cache->get_versiondata($pagename, $version);
759 return new WikiDB_PageRevision($this->_wikidb, $pagename, $version,
764 * Get previous page revision.
766 * This method find the most recent revision before a specified
771 * @param integer $version Find most recent revision before this version.
772 * You can also use a WikiDB_PageRevision object to specify the $version.
774 * @return WikiDB_PageRevision The requested WikiDB_PageRevision object, or false if the
775 * requested revision does not exist in the {@link WikiDB}. Note that
776 * unless $version is greater than zero, a revision (perhaps version zero,
777 * the default revision) will always be found.
779 function getRevisionBefore($version) {
780 $backend = &$this->_wikidb->_backend;
781 $pagename = &$this->_pagename;
783 $version = $this->_coerce_to_version($version);
788 $previous = $backend->get_previous_version($pagename, $version);
789 $revision = $this->getRevision($previous);
796 * Get all revisions of the WikiDB_Page.
798 * This does not include the version zero (default) revision in the
799 * returned revision set.
801 * @return WikiDB_PageRevisionIterator A
802 * WikiDB_PageRevisionIterator containing all revisions of this
803 * WikiDB_Page in reverse order by version number.
805 function getAllRevisions() {
806 $backend = &$this->_wikidb->_backend;
807 $revs = $backend->get_all_revisions($this->_pagename);
808 return new WikiDB_PageRevisionIterator($this->_wikidb, $revs);
812 * Find pages which link to or are linked from a page.
816 * @param boolean $reversed Which links to find: true for backlinks (default).
818 * @return WikiDB_PageIterator A WikiDB_PageIterator containing
819 * all matching pages.
821 function getLinks($reversed = true) {
822 $backend = &$this->_wikidb->_backend;
823 $result = $backend->get_links($this->_pagename, $reversed);
824 return new WikiDB_PageIterator($this->_wikidb, $result);
828 * Access WikiDB_Page meta-data.
832 * @param string $key Which meta data to get.
833 * Some reserved meta-data keys are:
835 * <dt>'locked'<dd> Is page locked?
836 * <dt>'hits' <dd> Page hit counter.
837 * <dt>'pref' <dd> Users preferences, stored in homepages.
838 * <dt>'owner' <dd> Default: first author_id. We might add a group with a dot here:
840 * <dt>'perm' <dd> Permission flag to authorize read/write/execution of
841 * page-headers and content.
842 * <dt>'score' <dd> Page score (not yet implement, do we need?)
845 * @return scalar The requested value, or false if the requested data
849 $cache = &$this->_wikidb->_cache;
850 if (!$key || $key[0] == '%')
852 $data = $cache->get_pagedata($this->_pagename);
853 return isset($data[$key]) ? $data[$key] : false;
857 * Get all the page meta-data as a hash.
859 * @return hash The page meta-data.
861 function getMetaData() {
862 $cache = &$this->_wikidb->_cache;
863 $data = $cache->get_pagedata($this->_pagename);
865 foreach ($data as $key => $val) {
866 if (/*!empty($val) &&*/ $key[0] != '%')
873 * Set page meta-data.
878 * @param string $key Meta-data key to set.
879 * @param string $newval New value.
881 function set($key, $newval) {
882 $cache = &$this->_wikidb->_cache;
883 $pagename = &$this->_pagename;
885 assert($key && $key[0] != '%');
887 $data = $cache->get_pagedata($pagename);
889 if (!empty($newval)) {
890 if (!empty($data[$key]) && $data[$key] == $newval)
891 return; // values identical, skip update.
894 if (empty($data[$key]))
895 return; // values identical, skip update.
898 $cache->update_pagedata($pagename, array($key => $newval));
902 * Increase page hit count.
904 * FIXME: IS this needed? Probably not.
906 * This is a convenience function.
907 * <pre> $page->increaseHitCount(); </pre>
908 * is functionally identical to
909 * <pre> $page->set('hits',$page->get('hits')+1); </pre>
911 * Note that this method may be implemented in more efficient ways
912 * in certain backends.
916 function increaseHitCount() {
917 @$newhits = $this->get('hits') + 1;
918 $this->set('hits', $newhits);
922 * Return a string representation of the WikiDB_Page
924 * This is really only for debugging.
928 * @return string Printable representation of the WikiDB_Page.
930 function asString () {
932 printf("[%s:%s\n", get_class($this), $this->getName());
933 print_r($this->getMetaData());
935 $strval = ob_get_contents();
943 * @param integer_or_object $version_or_pagerevision
944 * Takes either the version number (and int) or a WikiDB_PageRevision
946 * @return integer The version number.
948 function _coerce_to_version($version_or_pagerevision) {
949 if (method_exists($version_or_pagerevision, "getContent"))
950 $version = $version_or_pagerevision->getVersion();
952 $version = (int) $version_or_pagerevision;
954 assert($version >= 0);
958 function isUserPage ($include_empty = true) {
959 if ($include_empty) {
960 $current = $this->getCurrentRevision();
961 if ($current->hasDefaultContents()) {
965 return $this->get('pref') ? true : false;
971 * This class represents a specific revision of a WikiDB_Page within
974 * A WikiDB_PageRevision has read-only semantics. You may only create
975 * new revisions (and delete old ones) --- you cannot modify existing
978 class WikiDB_PageRevision
980 var $_transformedContent = false; // set by WikiDB_Page::save()
982 function WikiDB_PageRevision(&$wikidb, $pagename, $version,
983 $versiondata = false)
985 $this->_wikidb = &$wikidb;
986 $this->_pagename = $pagename;
987 $this->_version = $version;
988 $this->_data = $versiondata ? $versiondata : array();
992 * Get the WikiDB_Page which this revision belongs to.
996 * @return WikiDB_Page The WikiDB_Page which this revision belongs to.
999 return new WikiDB_Page($this->_wikidb, $this->_pagename);
1003 * Get the version number of this revision.
1007 * @return integer The version number of this revision.
1009 function getVersion() {
1010 return $this->_version;
1014 * Determine whether this revision has defaulted content.
1016 * The default revision (version 0) of each page, as well as any
1017 * pages which are created with empty content have their content
1018 * defaulted to something like:
1020 * Describe [ThisPage] here.
1025 * @return boolean Returns true if the page has default content.
1027 function hasDefaultContents() {
1028 $data = &$this->_data;
1029 return empty($data['%content']);
1033 * Get the content as an array of lines.
1037 * @return array An array of lines.
1038 * The lines should contain no trailing white space.
1040 function getContent() {
1041 return explode("\n", $this->getPackedContent());
1045 * Get the pagename of the revision.
1049 * @return string pagename.
1051 function getPageName() {
1052 return $this->_pagename;
1056 * Determine whether revision is the latest.
1060 * @return boolean True iff the revision is the latest (most recent) one.
1062 function isCurrent() {
1063 if (!isset($this->_iscurrent)) {
1064 $page = $this->getPage();
1065 $current = $page->getCurrentRevision();
1066 $this->_iscurrent = $this->getVersion() == $current->getVersion();
1068 return $this->_iscurrent;
1072 * Get the transformed content of a page.
1074 * @param string $pagetype Override the page-type of the revision.
1076 * @return object An XmlContent-like object containing the page transformed
1079 function getTransformedContent($pagetype_override=false) {
1080 $backend = &$this->_wikidb->_backend;
1082 if ($pagetype_override) {
1083 // Figure out the normal page-type for this page.
1084 $type = PageType::GetPageType($this->get('pagetype'));
1085 if ($type->getName() == $pagetype_override)
1086 $pagetype_override = false; // Not really an override...
1089 if ($pagetype_override) {
1090 // Overriden page type, don't cache (or check cache).
1091 return new TransformedText($this->getPage(),
1092 $this->getPackedContent(),
1093 $this->getMetaData(),
1094 $pagetype_override);
1097 $possibly_cache_results = true;
1099 if (defined('WIKIDB_NOCACHE_MARKUP') and WIKIDB_NOCACHE_MARKUP) {
1100 if (WIKIDB_NOCACHE_MARKUP == 'purge') {
1101 // flush cache for this page.
1102 $page = $this->getPage();
1103 $page->set('_cached_html', false);
1105 $possibly_cache_results = false;
1107 elseif (!$this->_transformedContent) {
1109 if ($this->isCurrent()) {
1110 $page = $this->getPage();
1111 $this->_transformedContent = TransformedText::unpack($page->get('_cached_html'));
1114 $possibly_cache_results = false;
1119 if (!$this->_transformedContent) {
1120 $this->_transformedContent
1121 = new TransformedText($this->getPage(),
1122 $this->getPackedContent(),
1123 $this->getMetaData());
1125 if ($possibly_cache_results) {
1126 // If we're still the current version, cache the transfomed page.
1128 if ($this->isCurrent()) {
1129 $page->set('_cached_html', $this->_transformedContent->pack());
1135 return $this->_transformedContent;
1139 * Get the content as a string.
1143 * @return string The page content.
1144 * Lines are separated by new-lines.
1146 function getPackedContent() {
1147 $data = &$this->_data;
1150 if (empty($data['%content'])) {
1151 include_once('lib/InlineParser.php');
1152 // Replace empty content with default value.
1153 return sprintf(_("Describe %s here."),
1154 "[" . WikiEscape($this->_pagename) . "]");
1157 // There is (non-default) content.
1158 assert($this->_version > 0);
1160 if (!is_string($data['%content'])) {
1161 // Content was not provided to us at init time.
1162 // (This is allowed because for some backends, fetching
1163 // the content may be expensive, and often is not wanted
1166 // In any case, now we need to get it.
1167 $data['%content'] = $this->_get_content();
1168 assert(is_string($data['%content']));
1171 return $data['%content'];
1174 function _get_content() {
1175 $cache = &$this->_wikidb->_cache;
1176 $pagename = $this->_pagename;
1177 $version = $this->_version;
1179 assert($version > 0);
1181 $newdata = $cache->get_versiondata($pagename, $version, true);
1183 assert(is_string($newdata['%content']));
1184 return $newdata['%content'];
1187 // else revision has been deleted... What to do?
1188 return __sprintf("Acck! Revision %s of %s seems to have been deleted!",
1189 $version, $pagename);
1194 * Get meta-data for this revision.
1199 * @param string $key Which meta-data to access.
1201 * Some reserved revision meta-data keys are:
1203 * <dt> 'mtime' <dd> Time this revision was created (seconds since midnight Jan 1, 1970.)
1204 * The 'mtime' meta-value is normally set automatically by the database
1205 * backend, but it may be specified explicitly when creating a new revision.
1207 * <dd> To ensure consistency of RecentChanges, the mtimes of the versions
1208 * of a page must be monotonically increasing. If an attempt is
1209 * made to create a new revision with an mtime less than that of
1210 * the preceeding revision, the new revisions timestamp is force
1211 * to be equal to that of the preceeding revision. In that case,
1212 * the originally requested mtime is preserved in 'orig_mtime'.
1213 * <dt> '_supplanted' <dd> Time this revision ceased to be the most recent.
1214 * This meta-value is <em>always</em> automatically maintained by the database
1215 * backend. (It is set from the 'mtime' meta-value of the superceding
1216 * revision.) '_supplanted' has a value of 'false' for the current revision.
1218 * FIXME: this could be refactored:
1220 * <dd> Author of the page (as he should be reported in, e.g. RecentChanges.)
1222 * <dd> Authenticated author of a page. This is used to identify
1223 * the distinctness of authors when cleaning old revisions from
1225 * <dt> 'is_minor_edit' <dd> Set if change was marked as a minor revision by the author.
1226 * <dt> 'summary' <dd> Short change summary entered by page author.
1229 * Meta-data keys must be valid C identifers (they have to start with a letter
1230 * or underscore, and can contain only alphanumerics and underscores.)
1232 * @return string The requested value, or false if the requested value
1235 function get($key) {
1236 if (!$key || $key[0] == '%')
1238 $data = &$this->_data;
1239 return isset($data[$key]) ? $data[$key] : false;
1243 * Get all the revision page meta-data as a hash.
1245 * @return hash The revision meta-data.
1247 function getMetaData() {
1249 foreach ($this->_data as $key => $val) {
1250 if (!empty($val) && $key[0] != '%')
1258 * Return a string representation of the revision.
1260 * This is really only for debugging.
1264 * @return string Printable representation of the WikiDB_Page.
1266 function asString () {
1268 printf("[%s:%d\n", get_class($this), $this->get('version'));
1269 print_r($this->_data);
1270 echo $this->getPackedContent() . "\n]\n";
1271 $strval = ob_get_contents();
1279 * A class which represents a sequence of WikiDB_Pages.
1281 class WikiDB_PageIterator
1283 function WikiDB_PageIterator(&$wikidb, &$pages) {
1284 $this->_pages = $pages;
1285 $this->_wikidb = &$wikidb;
1289 * Get next WikiDB_Page in sequence.
1293 * @return WikiDB_Page The next WikiDB_Page in the sequence.
1296 if ( ! ($next = $this->_pages->next()) )
1299 $pagename = &$next['pagename'];
1300 if (isset($next['pagedata']))
1301 $this->_wikidb->_cache->cache_data($next);
1303 return new WikiDB_Page($this->_wikidb, $pagename);
1307 * Release resources held by this iterator.
1309 * The iterator may not be used after free() is called.
1311 * There is no need to call free(), if next() has returned false.
1312 * (I.e. if you iterate through all the pages in the sequence,
1313 * you do not need to call free() --- you only need to call it
1314 * if you stop before the end of the iterator is reached.)
1319 $this->_pages->free();
1323 function setSortby ($arg = false) {
1325 $arg = @$_GET['sortby'];
1327 $sortby = substr($arg,1);
1328 $order = substr($arg,0,1)=='+' ? 'ASC' : 'DESC';
1331 if (is_array($arg)) { // array('mtime' => 'desc')
1338 // available column types to sort by:
1339 // todo: we must provide access methods for the generic dumb/iterator
1340 $this->_types = explode(',','pagename,mtime,hits,version,author,locked,minor,markup');
1341 if (in_array($sortby,$this->_types))
1342 $this->_options['sortby'] = $sortby;
1344 trigger_error(sprintf("Argument %s '%s' ignored",'sortby',$sortby), E_USER_WARNING);
1345 if (in_array(strtoupper($order),'ASC','DESC'))
1346 $this->_options['order'] = strtoupper($order);
1348 trigger_error(sprintf("Argument %s '%s' ignored",'order',$order), E_USER_WARNING);
1354 * A class which represents a sequence of WikiDB_PageRevisions.
1356 class WikiDB_PageRevisionIterator
1358 function WikiDB_PageRevisionIterator(&$wikidb, &$revisions) {
1359 $this->_revisions = $revisions;
1360 $this->_wikidb = &$wikidb;
1364 * Get next WikiDB_PageRevision in sequence.
1368 * @return WikiDB_PageRevision
1369 * The next WikiDB_PageRevision in the sequence.
1372 if ( ! ($next = $this->_revisions->next()) )
1375 $this->_wikidb->_cache->cache_data($next);
1377 $pagename = $next['pagename'];
1378 $version = $next['version'];
1379 $versiondata = $next['versiondata'];
1380 assert(!empty($pagename));
1381 assert(is_array($versiondata));
1382 assert($version > 0);
1384 return new WikiDB_PageRevision($this->_wikidb, $pagename, $version,
1389 * Release resources held by this iterator.
1391 * The iterator may not be used after free() is called.
1393 * There is no need to call free(), if next() has returned false.
1394 * (I.e. if you iterate through all the revisions in the sequence,
1395 * you do not need to call free() --- you only need to call it
1396 * if you stop before the end of the iterator is reached.)
1401 $this->_revisions->free();
1407 * Data cache used by WikiDB.
1409 * FIXME: Maybe rename this to caching_backend (or some such).
1415 // FIXME: beautify versiondata cache. Cache only limited data?
1417 function WikiDB_cache (&$backend) {
1418 $this->_backend = &$backend;
1420 $this->_pagedata_cache = array();
1421 $this->_versiondata_cache = array();
1422 array_push ($this->_versiondata_cache, array());
1423 $this->_glv_cache = array();
1427 $this->_pagedata_cache = false;
1428 $this->_versiondata_cache = false;
1429 $this->_glv_cache = false;
1432 function get_pagedata($pagename) {
1433 assert(is_string($pagename) && $pagename);
1434 $cache = &$this->_pagedata_cache;
1436 if (!isset($cache[$pagename]) || !is_array($cache[$pagename])) {
1437 $cache[$pagename] = $this->_backend->get_pagedata($pagename);
1438 if (empty($cache[$pagename]))
1439 $cache[$pagename] = array();
1442 return $cache[$pagename];
1445 function update_pagedata($pagename, $newdata) {
1446 assert(is_string($pagename) && $pagename);
1448 $this->_backend->update_pagedata($pagename, $newdata);
1450 if (is_array($this->_pagedata_cache[$pagename])) {
1451 $cachedata = &$this->_pagedata_cache[$pagename];
1452 foreach($newdata as $key => $val)
1453 $cachedata[$key] = $val;
1457 function invalidate_cache($pagename) {
1458 unset ($this->_pagedata_cache[$pagename]);
1459 unset ($this->_versiondata_cache[$pagename]);
1460 unset ($this->_glv_cache[$pagename]);
1463 function delete_page($pagename) {
1464 $this->_backend->delete_page($pagename);
1465 unset ($this->_pagedata_cache[$pagename]);
1466 unset ($this->_glv_cache[$pagename]);
1470 function cache_data($data) {
1471 if (isset($data['pagedata']))
1472 $this->_pagedata_cache[$data['pagename']] = $data['pagedata'];
1475 function get_versiondata($pagename, $version, $need_content = false) {
1476 // FIXME: Seriously ugly hackage
1477 if (defined ('USECACHE')){ //temporary - for debugging
1478 assert(is_string($pagename) && $pagename);
1479 // there is a bug here somewhere which results in an assertion failure at line 105
1480 // of ArchiveCleaner.php It goes away if we use the next line.
1481 $need_content = true;
1482 $nc = $need_content ? '1':'0';
1483 $cache = &$this->_versiondata_cache;
1484 if (!isset($cache[$pagename][$version][$nc])||
1485 !(is_array ($cache[$pagename])) || !(is_array ($cache[$pagename][$version]))) {
1486 $cache[$pagename][$version][$nc] =
1487 $this->_backend->get_versiondata($pagename,$version, $need_content);
1488 // If we have retrieved all data, we may as well set the cache for $need_content = false
1490 $cache[$pagename][$version]['0'] = $cache[$pagename][$version]['1'];
1493 $vdata = $cache[$pagename][$version][$nc];
1497 $vdata = $this->_backend->get_versiondata($pagename, $version, $need_content);
1500 if ($vdata && !empty($vdata['%pagedata']))
1501 $this->_pagedata_cache[$pagename] = $vdata['%pagedata'];
1505 function set_versiondata($pagename, $version, $data) {
1506 $new = $this->_backend->
1507 set_versiondata($pagename, $version, $data);
1509 $this->_versiondata_cache[$pagename][$version]['1'] = $data;
1511 $this->_versiondata_cache[$pagename][$version]['0'] = $data;
1512 // Is this necessary?
1513 unset($this->_glv_cache[$pagename]);
1517 function update_versiondata($pagename, $version, $data) {
1518 $new = $this->_backend->
1519 update_versiondata($pagename, $version, $data);
1521 $this->_versiondata_cache[$pagename][$version]['1'] = $data;
1523 $this->_versiondata_cache[$pagename][$version]['0'] = $data;
1524 // Is this necessary?
1525 unset($this->_glv_cache[$pagename]);
1529 function delete_versiondata($pagename, $version) {
1530 $new = $this->_backend->
1531 delete_versiondata($pagename, $version);
1532 unset ($this->_versiondata_cache[$pagename][$version]['1']);
1533 unset ($this->_versiondata_cache[$pagename][$version]['0']);
1534 unset ($this->_glv_cache[$pagename]);
1537 function get_latest_version($pagename) {
1538 if(defined('USECACHE')){
1539 assert (is_string($pagename) && $pagename);
1540 $cache = &$this->_glv_cache;
1541 if (!isset($cache[$pagename])) {
1542 $cache[$pagename] = $this->_backend->get_latest_version($pagename);
1543 if (empty($cache[$pagename]))
1544 $cache[$pagename] = 0;
1546 return $cache[$pagename];}
1548 return $this->_backend->get_latest_version($pagename);
1557 // c-basic-offset: 4
1558 // c-hanging-comment-ender-p: nil
1559 // indent-tabs-mode: nil