2 rcs_id('$Id: WikiDB.php,v 1.33 2004-02-12 13:05:49 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 further 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);
364 * Call the appropriate backend method
366 * A {@link WikiDB} consists of the (infinite) set of all possible pages,
367 * therefore this method never fails.
370 * @param string $from Page to rename
371 * @param string $to New name
372 * @param boolean $updateWikiLinks If the text in all pages should be replaced.
373 * @return boolean true or false
375 function renamePage($from, $to, $updateWikiLinks = false) {
376 assert(is_string($from) && $from);
377 assert(is_string($to) && $to);
379 if (method_exists($this->_backend,'rename_page')) {
380 $oldpage = $this->getPage($from);
381 if ($oldpage->exists()) {
382 if ($result = $this->_backend->rename_page($from, $to)) {
383 //TODO: update all WikiLinks in existing pages
384 if ($updateWikiLinks) {
385 trigger_error(_("WikiDB::renamePage(..,..,updateWikiLinks) not yet implemented"),E_USER_WARNING);
387 //create a RecentChanges entry with explaining summary
388 $page = $this->getPage($to);
389 $current = $page->getCurrentRevision();
390 $meta = $current->_data;
391 $version = $current->getVersion();
392 $meta['summary'] = sprintf(_("WikiAdminRename'd from %s"),$from);
393 $page->save($current->getPackedContent(), $version + 1, $meta);
397 trigger_error(_("WikiDB::renamePage() not yet implemented for this backend"),E_USER_WARNING);
402 /** Get timestamp when database was last modified.
404 * @return string A string consisting of two integers,
405 * separated by a space. The first is the time in
406 * unix timestamp format, the second is a modification
407 * count for the database.
409 * The idea is that you can cast the return value to an
410 * int to get a timestamp, or you can use the string value
411 * as a good hash for the entire database.
413 function getTimestamp() {
414 $ts = $this->get('_timestamp');
415 return sprintf("%d %d", $ts[0], $ts[1]);
419 * Update the database timestamp.
423 $ts = $this->get('_timestamp');
424 $this->set('_timestamp', array(time(), $ts[1] + 1));
429 * Access WikiDB global meta-data.
431 * NOTE: this is currently implemented in a hackish and
432 * not very efficient manner.
436 * @param string $key Which meta data to get.
437 * Some reserved meta-data keys are:
439 * <dt>'_timestamp' <dd> Data used by getTimestamp().
442 * @return scalar The requested value, or false if the requested data
446 if (!$key || $key[0] == '%')
449 * Hack Alert: We can use any page (existing or not) to store
450 * this data (as long as we always use the same one.)
452 $gd = $this->getPage('global_data');
453 $data = $gd->get('__global');
455 if ($data && isset($data[$key]))
462 * Set global meta-data.
464 * NOTE: this is currently implemented in a hackish and
465 * not very efficient manner.
470 * @param string $key Meta-data key to set.
471 * @param string $newval New value.
473 function set($key, $newval) {
474 if (!$key || $key[0] == '%')
477 $gd = $this->getPage('global_data');
479 $data = $gd->get('__global');
486 $data[$key] = $newval;
488 $gd->set('__global', $data);
494 * An abstract base class which representing a wiki-page within a
497 * A WikiDB_Page contains a number (at least one) of
498 * WikiDB_PageRevisions.
502 function WikiDB_Page(&$wikidb, $pagename) {
503 $this->_wikidb = &$wikidb;
504 $this->_pagename = $pagename;
505 assert(!empty($this->_pagename));
509 * Get the name of the wiki page.
513 * @return string The page name.
516 return $this->_pagename;
520 $current = $this->getCurrentRevision();
521 return ! $current->hasDefaultContents();
525 * Delete an old revision of a WikiDB_Page.
527 * Deletes the specified revision of the page.
528 * It is a fatal error to attempt to delete the current revision.
532 * @param integer $version Which revision to delete. (You can also
533 * use a WikiDB_PageRevision object here.)
535 function deleteRevision($version) {
536 $backend = &$this->_wikidb->_backend;
537 $cache = &$this->_wikidb->_cache;
538 $pagename = &$this->_pagename;
540 $version = $this->_coerce_to_version($version);
545 $latestversion = $cache->get_latest_version($pagename);
546 if ($latestversion && $version == $latestversion) {
548 trigger_error(sprintf("Attempt to delete most recent revision of '%s'",
549 $pagename), E_USER_ERROR);
553 $cache->delete_versiondata($pagename, $version);
559 * Delete a revision, or possibly merge it with a previous
563 * Suppose an author make a (major) edit to a page. Shortly
564 * after that the same author makes a minor edit (e.g. to fix
565 * spelling mistakes he just made.)
567 * Now some time later, where cleaning out old saved revisions,
568 * and would like to delete his minor revision (since there's
569 * really no point in keeping minor revisions around for a long
572 * Note that the text after the minor revision probably represents
573 * what the author intended to write better than the text after
574 * the preceding major edit.
576 * So what we really want to do is merge the minor edit with the
579 * We will only do this when:
581 * <li>The revision being deleted is a minor one, and
582 * <li>It has the same author as the immediately preceding revision.
585 function mergeRevision($version) {
586 $backend = &$this->_wikidb->_backend;
587 $cache = &$this->_wikidb->_cache;
588 $pagename = &$this->_pagename;
590 $version = $this->_coerce_to_version($version);
595 $latestversion = $backend->get_latest_version($pagename);
596 if ($latestversion && $version == $latestversion) {
598 trigger_error(sprintf("Attempt to merge most recent revision of '%s'",
599 $pagename), E_USER_ERROR);
603 $versiondata = $cache->get_versiondata($pagename, $version, true);
605 // Not there? ... we're done!
610 if ($versiondata['is_minor_edit']) {
611 $previous = $backend->get_previous_version($pagename, $version);
613 $prevdata = $cache->get_versiondata($pagename, $previous);
614 if ($prevdata['author_id'] == $versiondata['author_id']) {
615 // This is a minor revision, previous version is
616 // by the same author. We will merge the
618 $cache->update_versiondata($pagename, $previous,
619 array('%content' => $versiondata['%content'],
620 '_supplanted' => $versiondata['_supplanted']));
625 $cache->delete_versiondata($pagename, $version);
631 * Create a new revision of a {@link WikiDB_Page}.
635 * @param int $version Version number for new revision.
636 * To ensure proper serialization of edits, $version must be
637 * exactly one higher than the current latest version.
638 * (You can defeat this check by setting $version to
639 * {@link WIKIDB_FORCE_CREATE} --- not usually recommended.)
641 * @param string $content Contents of new revision.
643 * @param hash $metadata Metadata for new revision.
644 * All values in the hash should be scalars (strings or integers).
646 * @param array $links List of pagenames which this page links to.
648 * @return WikiDB_PageRevision Returns the new WikiDB_PageRevision object. If
649 * $version was incorrect, returns false
651 function createRevision($version, &$content, $metadata, $links) {
652 $backend = &$this->_wikidb->_backend;
653 $cache = &$this->_wikidb->_cache;
654 $pagename = &$this->_pagename;
658 $latestversion = $backend->get_latest_version($pagename);
659 $newversion = $latestversion + 1;
660 assert($newversion >= 1);
662 if ($version != WIKIDB_FORCE_CREATE && $version != $newversion) {
669 foreach ($data as $key => $val) {
670 if (empty($val) || $key[0] == '_' || $key[0] == '%')
674 assert(!empty($data['author']));
675 if (empty($data['author_id']))
676 @$data['author_id'] = $data['author'];
678 if (empty($data['mtime']))
679 $data['mtime'] = time();
681 if ($latestversion) {
682 // Ensure mtimes are monotonic.
683 $pdata = $cache->get_versiondata($pagename, $latestversion);
684 if ($data['mtime'] < $pdata['mtime']) {
685 trigger_error(sprintf(_("%s: Date of new revision is %s"),
686 $pagename,"'non-monotonic'"),
688 $data['orig_mtime'] = $data['mtime'];
689 $data['mtime'] = $pdata['mtime'];
692 // FIXME: use (possibly user specified) 'mtime' time or
694 $cache->update_versiondata($pagename, $latestversion,
695 array('_supplanted' => $data['mtime']));
698 $data['%content'] = &$content;
700 $cache->set_versiondata($pagename, $newversion, $data);
702 //$cache->update_pagedata($pagename, array(':latestversion' => $newversion,
703 //':deleted' => empty($content)));
705 $backend->set_links($pagename, $links);
709 return new WikiDB_PageRevision($this->_wikidb, $pagename, $newversion,
713 /** A higher-level interface to createRevision.
715 * This takes care of computing the links, and storing
716 * a cached version of the transformed wiki-text.
718 * @param string $wikitext The page content.
720 * @param int $version Version number for new revision.
721 * To ensure proper serialization of edits, $version must be
722 * exactly one higher than the current latest version.
723 * (You can defeat this check by setting $version to
724 * {@link WIKIDB_FORCE_CREATE} --- not usually recommended.)
726 * @param hash $meta Meta-data for new revision.
728 function save($wikitext, $version, $meta) {
729 $formatted = new TransformedText($this, $wikitext, $meta);
730 $type = $formatted->getType();
731 $meta['pagetype'] = $type->getName();
732 $links = $formatted->getWikiPageLinks();
734 $backend = &$this->_wikidb->_backend;
736 $newrevision = $this->createRevision($version, $wikitext, $meta, $links);
738 if (!defined('WIKIDB_NOCACHE_MARKUP') or !WIKIDB_NOCACHE_MARKUP)
739 $this->set('_cached_html', $formatted->pack());
742 // FIXME: probably should have some global state information
743 // in the backend to control when to optimize.
745 // We're doing this here rather than in createRevision because
746 // postgres can't optimize while locked.
747 if (time() % 50 == 0) {
748 trigger_error(sprintf(_("Optimizing %s"),'backend'), E_USER_NOTICE);
749 $backend->optimize();
752 $newrevision->_transformedContent = $formatted;
757 * Get the most recent revision of a page.
761 * @return WikiDB_PageRevision The current WikiDB_PageRevision object.
763 function getCurrentRevision() {
764 $backend = &$this->_wikidb->_backend;
765 $cache = &$this->_wikidb->_cache;
766 $pagename = &$this->_pagename;
769 $version = $cache->get_latest_version($pagename);
770 $revision = $this->getRevision($version);
777 * Get a specific revision of a WikiDB_Page.
781 * @param integer $version Which revision to get.
783 * @return WikiDB_PageRevision The requested WikiDB_PageRevision object, or
784 * false if the requested revision does not exist in the {@link WikiDB}.
785 * Note that version zero of any page always exists.
787 function getRevision($version) {
788 $cache = &$this->_wikidb->_cache;
789 $pagename = &$this->_pagename;
792 return new WikiDB_PageRevision($this->_wikidb, $pagename, 0);
794 assert($version > 0);
795 $vdata = $cache->get_versiondata($pagename, $version);
798 return new WikiDB_PageRevision($this->_wikidb, $pagename, $version,
803 * Get previous page revision.
805 * This method find the most recent revision before a specified
810 * @param integer $version Find most recent revision before this version.
811 * You can also use a WikiDB_PageRevision object to specify the $version.
813 * @return WikiDB_PageRevision The requested WikiDB_PageRevision object, or false if the
814 * requested revision does not exist in the {@link WikiDB}. Note that
815 * unless $version is greater than zero, a revision (perhaps version zero,
816 * the default revision) will always be found.
818 function getRevisionBefore($version) {
819 $backend = &$this->_wikidb->_backend;
820 $pagename = &$this->_pagename;
822 $version = $this->_coerce_to_version($version);
827 $previous = $backend->get_previous_version($pagename, $version);
828 $revision = $this->getRevision($previous);
835 * Get all revisions of the WikiDB_Page.
837 * This does not include the version zero (default) revision in the
838 * returned revision set.
840 * @return WikiDB_PageRevisionIterator A
841 * WikiDB_PageRevisionIterator containing all revisions of this
842 * WikiDB_Page in reverse order by version number.
844 function getAllRevisions() {
845 $backend = &$this->_wikidb->_backend;
846 $revs = $backend->get_all_revisions($this->_pagename);
847 return new WikiDB_PageRevisionIterator($this->_wikidb, $revs);
851 * Find pages which link to or are linked from a page.
855 * @param boolean $reversed Which links to find: true for backlinks (default).
857 * @return WikiDB_PageIterator A WikiDB_PageIterator containing
858 * all matching pages.
860 function getLinks($reversed = true) {
861 $backend = &$this->_wikidb->_backend;
862 $result = $backend->get_links($this->_pagename, $reversed);
863 return new WikiDB_PageIterator($this->_wikidb, $result);
867 * Access WikiDB_Page meta-data.
871 * @param string $key Which meta data to get.
872 * Some reserved meta-data keys are:
874 * <dt>'locked'<dd> Is page locked?
875 * <dt>'hits' <dd> Page hit counter.
876 * <dt>'pref' <dd> Users preferences, stored in homepages.
877 * <dt>'owner' <dd> Default: first author_id. We might add a group with a dot here:
879 * <dt>'perm' <dd> Permission flag to authorize read/write/execution of
880 * page-headers and content.
881 * <dt>'score' <dd> Page score (not yet implement, do we need?)
884 * @return scalar The requested value, or false if the requested data
888 $cache = &$this->_wikidb->_cache;
889 if (!$key || $key[0] == '%')
891 $data = $cache->get_pagedata($this->_pagename);
892 return isset($data[$key]) ? $data[$key] : false;
896 * Get all the page meta-data as a hash.
898 * @return hash The page meta-data.
900 function getMetaData() {
901 $cache = &$this->_wikidb->_cache;
902 $data = $cache->get_pagedata($this->_pagename);
904 foreach ($data as $key => $val) {
905 if (/*!empty($val) &&*/ $key[0] != '%')
912 * Set page meta-data.
917 * @param string $key Meta-data key to set.
918 * @param string $newval New value.
920 function set($key, $newval) {
921 $cache = &$this->_wikidb->_cache;
922 $pagename = &$this->_pagename;
924 assert($key && $key[0] != '%');
926 $data = $cache->get_pagedata($pagename);
928 if (!empty($newval)) {
929 if (!empty($data[$key]) && $data[$key] == $newval)
930 return; // values identical, skip update.
933 if (empty($data[$key]))
934 return; // values identical, skip update.
937 $cache->update_pagedata($pagename, array($key => $newval));
941 * Increase page hit count.
943 * FIXME: IS this needed? Probably not.
945 * This is a convenience function.
946 * <pre> $page->increaseHitCount(); </pre>
947 * is functionally identical to
948 * <pre> $page->set('hits',$page->get('hits')+1); </pre>
950 * Note that this method may be implemented in more efficient ways
951 * in certain backends.
955 function increaseHitCount() {
956 @$newhits = $this->get('hits') + 1;
957 $this->set('hits', $newhits);
961 * Return a string representation of the WikiDB_Page
963 * This is really only for debugging.
967 * @return string Printable representation of the WikiDB_Page.
969 function asString () {
971 printf("[%s:%s\n", get_class($this), $this->getName());
972 print_r($this->getMetaData());
974 $strval = ob_get_contents();
982 * @param integer_or_object $version_or_pagerevision
983 * Takes either the version number (and int) or a WikiDB_PageRevision
985 * @return integer The version number.
987 function _coerce_to_version($version_or_pagerevision) {
988 if (method_exists($version_or_pagerevision, "getContent"))
989 $version = $version_or_pagerevision->getVersion();
991 $version = (int) $version_or_pagerevision;
993 assert($version >= 0);
997 function isUserPage ($include_empty = true) {
998 if ($include_empty) {
999 $current = $this->getCurrentRevision();
1000 if ($current->hasDefaultContents()) {
1004 return $this->get('pref') ? true : false;
1010 * This class represents a specific revision of a WikiDB_Page within
1013 * A WikiDB_PageRevision has read-only semantics. You may only create
1014 * new revisions (and delete old ones) --- you cannot modify existing
1017 class WikiDB_PageRevision
1019 var $_transformedContent = false; // set by WikiDB_Page::save()
1021 function WikiDB_PageRevision(&$wikidb, $pagename, $version,
1022 $versiondata = false)
1024 $this->_wikidb = &$wikidb;
1025 $this->_pagename = $pagename;
1026 $this->_version = $version;
1027 $this->_data = $versiondata ? $versiondata : array();
1031 * Get the WikiDB_Page which this revision belongs to.
1035 * @return WikiDB_Page The WikiDB_Page which this revision belongs to.
1037 function getPage() {
1038 return new WikiDB_Page($this->_wikidb, $this->_pagename);
1042 * Get the version number of this revision.
1046 * @return integer The version number of this revision.
1048 function getVersion() {
1049 return $this->_version;
1053 * Determine whether this revision has defaulted content.
1055 * The default revision (version 0) of each page, as well as any
1056 * pages which are created with empty content have their content
1057 * defaulted to something like:
1059 * Describe [ThisPage] here.
1064 * @return boolean Returns true if the page has default content.
1066 function hasDefaultContents() {
1067 $data = &$this->_data;
1068 return empty($data['%content']);
1072 * Get the content as an array of lines.
1076 * @return array An array of lines.
1077 * The lines should contain no trailing white space.
1079 function getContent() {
1080 return explode("\n", $this->getPackedContent());
1084 * Get the pagename of the revision.
1088 * @return string pagename.
1090 function getPageName() {
1091 return $this->_pagename;
1095 * Determine whether revision is the latest.
1099 * @return boolean True iff the revision is the latest (most recent) one.
1101 function isCurrent() {
1102 if (!isset($this->_iscurrent)) {
1103 $page = $this->getPage();
1104 $current = $page->getCurrentRevision();
1105 $this->_iscurrent = $this->getVersion() == $current->getVersion();
1107 return $this->_iscurrent;
1111 * Get the transformed content of a page.
1113 * @param string $pagetype Override the page-type of the revision.
1115 * @return object An XmlContent-like object containing the page transformed
1118 function getTransformedContent($pagetype_override=false) {
1119 $backend = &$this->_wikidb->_backend;
1121 if ($pagetype_override) {
1122 // Figure out the normal page-type for this page.
1123 $type = PageType::GetPageType($this->get('pagetype'));
1124 if ($type->getName() == $pagetype_override)
1125 $pagetype_override = false; // Not really an override...
1128 if ($pagetype_override) {
1129 // Overriden page type, don't cache (or check cache).
1130 return new TransformedText($this->getPage(),
1131 $this->getPackedContent(),
1132 $this->getMetaData(),
1133 $pagetype_override);
1136 $possibly_cache_results = true;
1138 if (defined('WIKIDB_NOCACHE_MARKUP') and WIKIDB_NOCACHE_MARKUP) {
1139 if (WIKIDB_NOCACHE_MARKUP == 'purge') {
1140 // flush cache for this page.
1141 $page = $this->getPage();
1142 $page->set('_cached_html', false);
1144 $possibly_cache_results = false;
1146 elseif (!$this->_transformedContent) {
1148 if ($this->isCurrent()) {
1149 $page = $this->getPage();
1150 $this->_transformedContent = TransformedText::unpack($page->get('_cached_html'));
1153 $possibly_cache_results = false;
1158 if (!$this->_transformedContent) {
1159 $this->_transformedContent
1160 = new TransformedText($this->getPage(),
1161 $this->getPackedContent(),
1162 $this->getMetaData());
1164 if ($possibly_cache_results) {
1165 // If we're still the current version, cache the transfomed page.
1167 if ($this->isCurrent()) {
1168 $page->set('_cached_html', $this->_transformedContent->pack());
1174 return $this->_transformedContent;
1178 * Get the content as a string.
1182 * @return string The page content.
1183 * Lines are separated by new-lines.
1185 function getPackedContent() {
1186 $data = &$this->_data;
1189 if (empty($data['%content'])) {
1190 include_once('lib/InlineParser.php');
1191 // Replace empty content with default value.
1192 return sprintf(_("Describe %s here."),
1193 "[" . WikiEscape($this->_pagename) . "]");
1196 // There is (non-default) content.
1197 assert($this->_version > 0);
1199 if (!is_string($data['%content'])) {
1200 // Content was not provided to us at init time.
1201 // (This is allowed because for some backends, fetching
1202 // the content may be expensive, and often is not wanted
1205 // In any case, now we need to get it.
1206 $data['%content'] = $this->_get_content();
1207 assert(is_string($data['%content']));
1210 return $data['%content'];
1213 function _get_content() {
1214 $cache = &$this->_wikidb->_cache;
1215 $pagename = $this->_pagename;
1216 $version = $this->_version;
1218 assert($version > 0);
1220 $newdata = $cache->get_versiondata($pagename, $version, true);
1222 assert(is_string($newdata['%content']));
1223 return $newdata['%content'];
1226 // else revision has been deleted... What to do?
1227 return __sprintf("Acck! Revision %s of %s seems to have been deleted!",
1228 $version, $pagename);
1233 * Get meta-data for this revision.
1238 * @param string $key Which meta-data to access.
1240 * Some reserved revision meta-data keys are:
1242 * <dt> 'mtime' <dd> Time this revision was created (seconds since midnight Jan 1, 1970.)
1243 * The 'mtime' meta-value is normally set automatically by the database
1244 * backend, but it may be specified explicitly when creating a new revision.
1246 * <dd> To ensure consistency of RecentChanges, the mtimes of the versions
1247 * of a page must be monotonically increasing. If an attempt is
1248 * made to create a new revision with an mtime less than that of
1249 * the preceeding revision, the new revisions timestamp is force
1250 * to be equal to that of the preceeding revision. In that case,
1251 * the originally requested mtime is preserved in 'orig_mtime'.
1252 * <dt> '_supplanted' <dd> Time this revision ceased to be the most recent.
1253 * This meta-value is <em>always</em> automatically maintained by the database
1254 * backend. (It is set from the 'mtime' meta-value of the superceding
1255 * revision.) '_supplanted' has a value of 'false' for the current revision.
1257 * FIXME: this could be refactored:
1259 * <dd> Author of the page (as he should be reported in, e.g. RecentChanges.)
1261 * <dd> Authenticated author of a page. This is used to identify
1262 * the distinctness of authors when cleaning old revisions from
1264 * <dt> 'is_minor_edit' <dd> Set if change was marked as a minor revision by the author.
1265 * <dt> 'summary' <dd> Short change summary entered by page author.
1268 * Meta-data keys must be valid C identifers (they have to start with a letter
1269 * or underscore, and can contain only alphanumerics and underscores.)
1271 * @return string The requested value, or false if the requested value
1274 function get($key) {
1275 if (!$key || $key[0] == '%')
1277 $data = &$this->_data;
1278 return isset($data[$key]) ? $data[$key] : false;
1282 * Get all the revision page meta-data as a hash.
1284 * @return hash The revision meta-data.
1286 function getMetaData() {
1288 foreach ($this->_data as $key => $val) {
1289 if (!empty($val) && $key[0] != '%')
1297 * Return a string representation of the revision.
1299 * This is really only for debugging.
1303 * @return string Printable representation of the WikiDB_Page.
1305 function asString () {
1307 printf("[%s:%d\n", get_class($this), $this->get('version'));
1308 print_r($this->_data);
1309 echo $this->getPackedContent() . "\n]\n";
1310 $strval = ob_get_contents();
1318 * A class which represents a sequence of WikiDB_Pages.
1320 class WikiDB_PageIterator
1322 function WikiDB_PageIterator(&$wikidb, &$pages) {
1323 $this->_pages = $pages;
1324 $this->_wikidb = &$wikidb;
1328 * Get next WikiDB_Page in sequence.
1332 * @return WikiDB_Page The next WikiDB_Page in the sequence.
1335 if ( ! ($next = $this->_pages->next()) )
1338 $pagename = &$next['pagename'];
1339 if (isset($next['pagedata']))
1340 $this->_wikidb->_cache->cache_data($next);
1342 return new WikiDB_Page($this->_wikidb, $pagename);
1346 * Release resources held by this iterator.
1348 * The iterator may not be used after free() is called.
1350 * There is no need to call free(), if next() has returned false.
1351 * (I.e. if you iterate through all the pages in the sequence,
1352 * you do not need to call free() --- you only need to call it
1353 * if you stop before the end of the iterator is reached.)
1358 $this->_pages->free();
1362 function setSortby ($arg = false) {
1364 $arg = @$_GET['sortby'];
1366 $sortby = substr($arg,1);
1367 $order = substr($arg,0,1)=='+' ? 'ASC' : 'DESC';
1370 if (is_array($arg)) { // array('mtime' => 'desc')
1377 // available column types to sort by:
1378 // todo: we must provide access methods for the generic dumb/iterator
1379 $this->_types = explode(',','pagename,mtime,hits,version,author,locked,minor,markup');
1380 if (in_array($sortby,$this->_types))
1381 $this->_options['sortby'] = $sortby;
1383 trigger_error(sprintf("Argument %s '%s' ignored",'sortby',$sortby), E_USER_WARNING);
1384 if (in_array(strtoupper($order),'ASC','DESC'))
1385 $this->_options['order'] = strtoupper($order);
1387 trigger_error(sprintf("Argument %s '%s' ignored",'order',$order), E_USER_WARNING);
1393 * A class which represents a sequence of WikiDB_PageRevisions.
1395 class WikiDB_PageRevisionIterator
1397 function WikiDB_PageRevisionIterator(&$wikidb, &$revisions) {
1398 $this->_revisions = $revisions;
1399 $this->_wikidb = &$wikidb;
1403 * Get next WikiDB_PageRevision in sequence.
1407 * @return WikiDB_PageRevision
1408 * The next WikiDB_PageRevision in the sequence.
1411 if ( ! ($next = $this->_revisions->next()) )
1414 $this->_wikidb->_cache->cache_data($next);
1416 $pagename = $next['pagename'];
1417 $version = $next['version'];
1418 $versiondata = $next['versiondata'];
1419 assert(!empty($pagename));
1420 assert(is_array($versiondata));
1421 assert($version > 0);
1423 return new WikiDB_PageRevision($this->_wikidb, $pagename, $version,
1428 * Release resources held by this iterator.
1430 * The iterator may not be used after free() is called.
1432 * There is no need to call free(), if next() has returned false.
1433 * (I.e. if you iterate through all the revisions in the sequence,
1434 * you do not need to call free() --- you only need to call it
1435 * if you stop before the end of the iterator is reached.)
1440 $this->_revisions->free();
1446 * Data cache used by WikiDB.
1448 * FIXME: Maybe rename this to caching_backend (or some such).
1454 // FIXME: beautify versiondata cache. Cache only limited data?
1456 function WikiDB_cache (&$backend) {
1457 $this->_backend = &$backend;
1459 $this->_pagedata_cache = array();
1460 $this->_versiondata_cache = array();
1461 array_push ($this->_versiondata_cache, array());
1462 $this->_glv_cache = array();
1466 $this->_pagedata_cache = false;
1467 $this->_versiondata_cache = false;
1468 $this->_glv_cache = false;
1471 function get_pagedata($pagename) {
1472 assert(is_string($pagename) && $pagename);
1473 $cache = &$this->_pagedata_cache;
1475 if (!isset($cache[$pagename]) || !is_array($cache[$pagename])) {
1476 $cache[$pagename] = $this->_backend->get_pagedata($pagename);
1477 if (empty($cache[$pagename]))
1478 $cache[$pagename] = array();
1481 return $cache[$pagename];
1484 function update_pagedata($pagename, $newdata) {
1485 assert(is_string($pagename) && $pagename);
1487 $this->_backend->update_pagedata($pagename, $newdata);
1489 if (is_array($this->_pagedata_cache[$pagename])) {
1490 $cachedata = &$this->_pagedata_cache[$pagename];
1491 foreach($newdata as $key => $val)
1492 $cachedata[$key] = $val;
1496 function invalidate_cache($pagename) {
1497 unset ($this->_pagedata_cache[$pagename]);
1498 unset ($this->_versiondata_cache[$pagename]);
1499 unset ($this->_glv_cache[$pagename]);
1502 function delete_page($pagename) {
1503 $this->_backend->delete_page($pagename);
1504 unset ($this->_pagedata_cache[$pagename]);
1505 unset ($this->_glv_cache[$pagename]);
1509 function cache_data($data) {
1510 if (isset($data['pagedata']))
1511 $this->_pagedata_cache[$data['pagename']] = $data['pagedata'];
1514 function get_versiondata($pagename, $version, $need_content = false) {
1515 // FIXME: Seriously ugly hackage
1516 if (defined ('USECACHE')){ //temporary - for debugging
1517 assert(is_string($pagename) && $pagename);
1518 // there is a bug here somewhere which results in an assertion failure at line 105
1519 // of ArchiveCleaner.php It goes away if we use the next line.
1520 $need_content = true;
1521 $nc = $need_content ? '1':'0';
1522 $cache = &$this->_versiondata_cache;
1523 if (!isset($cache[$pagename][$version][$nc])||
1524 !(is_array ($cache[$pagename])) || !(is_array ($cache[$pagename][$version]))) {
1525 $cache[$pagename][$version][$nc] =
1526 $this->_backend->get_versiondata($pagename,$version, $need_content);
1527 // If we have retrieved all data, we may as well set the cache for $need_content = false
1529 $cache[$pagename][$version]['0'] = $cache[$pagename][$version]['1'];
1532 $vdata = $cache[$pagename][$version][$nc];
1536 $vdata = $this->_backend->get_versiondata($pagename, $version, $need_content);
1539 if ($vdata && !empty($vdata['%pagedata']))
1540 $this->_pagedata_cache[$pagename] = $vdata['%pagedata'];
1544 function set_versiondata($pagename, $version, $data) {
1545 $new = $this->_backend->
1546 set_versiondata($pagename, $version, $data);
1548 $this->_versiondata_cache[$pagename][$version]['1'] = $data;
1550 $this->_versiondata_cache[$pagename][$version]['0'] = $data;
1551 // Is this necessary?
1552 unset($this->_glv_cache[$pagename]);
1556 function update_versiondata($pagename, $version, $data) {
1557 $new = $this->_backend->
1558 update_versiondata($pagename, $version, $data);
1560 $this->_versiondata_cache[$pagename][$version]['1'] = $data;
1562 $this->_versiondata_cache[$pagename][$version]['0'] = $data;
1563 // Is this necessary?
1564 unset($this->_glv_cache[$pagename]);
1568 function delete_versiondata($pagename, $version) {
1569 $new = $this->_backend->
1570 delete_versiondata($pagename, $version);
1571 unset ($this->_versiondata_cache[$pagename][$version]['1']);
1572 unset ($this->_versiondata_cache[$pagename][$version]['0']);
1573 unset ($this->_glv_cache[$pagename]);
1576 function get_latest_version($pagename) {
1577 if(defined('USECACHE')){
1578 assert (is_string($pagename) && $pagename);
1579 $cache = &$this->_glv_cache;
1580 if (!isset($cache[$pagename])) {
1581 $cache[$pagename] = $this->_backend->get_latest_version($pagename);
1582 if (empty($cache[$pagename]))
1583 $cache[$pagename] = 0;
1585 return $cache[$pagename];}
1587 return $this->_backend->get_latest_version($pagename);
1596 // c-basic-offset: 4
1597 // c-hanging-comment-ender-p: nil
1598 // indent-tabs-mode: nil