if ($reset) {
$nodes = array();
}

$cachable = ($revision == NULL);
$arguments = array();
if (is_numeric($param)) {
if ($cachable) {
// Is the node statically cached?
if (isset($nodes[$param])) {
return is_object($nodes[$param]) ? drupal_clone($nodes[$param]) : $nodes[$param];
}
}
$cond = 'n.nid = %d';
$arguments[] = $param;
}
elseif (is_array($param)) {
// Turn the conditions into a query.
foreach ($param as $key => $value) {
$cond[] = 'n.'. db_escape_table($key) ." = '%s'";
$arguments[] = $value;
}
$cond = implode(' AND ', $cond);
}
else {
return FALSE;
}

// Retrieve a field list based on the site's schema.
$fields = drupal_schema_fields_sql('node', 'n');
$fields = array_merge($fields, drupal_schema_fields_sql('node_revisions', 'r'));
//hack
//$fields = array_merge($fields, array('u.name', 'u.picture', 'u.data'));
// Remove fields not needed in the query: n.vid and r.nid are redundant,
// n.title is unnecessary because the node title comes from the
// node_revisions table. We'll keep r.vid, r.title, and n.nid.
$fields = array_diff($fields, array('n.vid', 'n.title', 'r.nid'));
$fields = implode(', ', $fields);
// Rename timestamp field for clarity.
$fields = str_replace('r.timestamp', 'r.timestamp AS revision_timestamp', $fields);
// Change name of revision uid so it doesn't conflict with n.uid.
$fields = str_replace('r.uid', 'r.uid AS revision_uid', $fields);

// Retrieve the node.
// No db_rewrite_sql is applied so as to get complete indexing for search.
/*
//hack
if ($revision) {
array_unshift($arguments, $revision);
$node = db_fetch_object(db_query('SELECT '. $fields .' FROM {node} n INNER JOIN {users} u ON u.uid = n.uid INNER JOIN {node_revisions} r ON r.nid = n.nid AND r.vid = %d WHERE '. $cond, $arguments));
}
else {
$node = db_fetch_object(db_query('SELECT '. $fields .' FROM {node} n INNER JOIN {users} u ON u.uid = n.uid INNER JOIN {node_revisions} r ON r.vid = n.vid WHERE '. $cond, $arguments));
}
*/
if ($revision) {
array_unshift($arguments, $revision);
$node = db_fetch_object(db_query('SELECT '. $fields .' FROM {node} n INNER JOIN {node_revisions} r ON r.nid = n.nid AND r.vid = %d WHERE '. $cond, $arguments));
}
else {
$node = db_fetch_object(db_query('SELECT '. $fields .' FROM {node} n INNER JOIN {node_revisions} r ON r.vid = n.vid WHERE '. $cond, $arguments));
}

if ($node && $node->nid) {
// Call the node specific callback (if any) and piggy-back the
// results to the node or overwrite some values.
if ($extra = node_invoke($node, 'load')) {
foreach ($extra as $key => $value) {
$node->$key = $value;
}
}

if ($extra = node_invoke_nodeapi($node, 'load')) {
foreach ($extra as $key => $value) {
$node->$key = $value;
}
}
if ($cachable) {
$nodes[$node->nid] = is_object($node) ? drupal_clone($node) : $node;
}
}

$path_language = $path_language ? $path_language : $language->language;

// Use $count to avoid looking up paths in subsequent calls if there simply are no aliases
if (!isset($count)) {
$count = db_result(db_query('SELECT COUNT(pid) FROM {url_alias}'));
}

if ($action == 'wipe') {
$map = array();
$no_src = array();
$count = NULL;
}
elseif ($count > 0 && $path != '') {
if ($action == 'alias') {
if (isset($map[$path_language][$path])) {
return $map[$path_language][$path];
}
// Get the most fitting result falling back with alias without language
/*
//hack
$alias = db_result(db_query("SELECT dst FROM {url_alias} WHERE src = '%s' AND language IN('%s', '') ORDER BY language DESC, pid DESC", $path, $path_language));
*/
$alias = db_result(db_query("SELECT dst FROM {url_alias} WHERE src = '%s'", $path));
$map[$path_language][$path] = $alias;
return $alias;
}
// Check $no_src for this $path in case we've already determined that there
// isn't a path that has this alias
elseif ($action == 'source' && !isset($no_src[$path_language][$path])) {
// Look for the value $path within the cached $map
$src = FALSE;
if (!isset($map[$path_language]) || !($src = array_search($path, $map[$path_language]))) {
// Get the most fitting result falling back with alias without language
/*
//hack
if ($src = db_result(db_query("SELECT src FROM {url_alias} WHERE dst = '%s' AND language IN('%s', '') ORDER BY language DESC, pid DESC", $path, $path_language))) {
*/
if ($src = db_result(db_query("SELECT src FROM {url_alias} WHERE dst = '%s'", $path))) {
$map[$path_language][$src] = $path;
}
else {
// We can't record anything into $map because we do not have a valid
// index and there is no need because we have not learned anything
// about any Drupal path. Thus cache to $no_src.
$no_src[$path_language][$path] = TRUE;
}
}
return $src;
}
}