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<?php
// $Id$
require('context.core.inc');
define('CONTEXT_GET', 0);
define('CONTEXT_SET', 1);
define('CONTEXT_ISSET', 2);
define('CONTEXT_CLEAR', 3);
define('CONTEXT_STORAGE_DEFAULT', 0);
define('CONTEXT_STORAGE_OVERRIDDEN', 1);
define('CONTEXT_STORAGE_NORMAL', 2);
define('CONTEXT_STATUS_DISABLED', 0);
define('CONTEXT_STATUS_ENABLED', 1);
/**
* Master context function. Avoid calling this directly -- use one of the helper functions below.
*
* @param $op
* The operation to perform - handled by the context helper functions. Use them.
* @param $namespace
* A string to be used as the namespace for the context information.
* @param $attribute
* Usually a string to be used as a key to set/retrieve context information. An array can
* also be used when setting context to establish an entire context namespace at once.
* (At some point objects may also be accepted, but currently functionaliy isn't complete.)
* @param $value
* A value to set for the provided key. If omitted the value will be set to true.
*
* @return
* Either the requested value, or false if the operation fails.
*/
function context_context($op = CONTEXT_GET, $namespace = null, $attribute = null, $value = null) {
static $context;
$context = !$context ? array() : $context;
switch ($op) {
case CONTEXT_GET:
// return entire context
if (!$namespace) {
return $context;
}
// return entire space if set
else if (isset($context[(string) $namespace])) {
// return val of key from space
if (is_array($context[(string) $namespace]) && isset($context[(string) $namespace][(string) $attribute])) {
return $context[(string) $namespace][(string) $attribute];
}
elseif (!$attribute){
return $context[(string) $namespace];
}
}
break;
case CONTEXT_SET:
// bail if invalid space is specified or context is already set
if (is_string($namespace) || is_int($namespace)) {
// initialize namespace if no key is specified
if (!$attribute) {
$context[(string) $namespace] = array();
return true;
}
// set to true if key is a usable identifier. otherwise, allow a key or object to be inserted
if (!$value) {
if (is_string($attribute) || is_int($attribute)) {
$context[(string) $namespace][(string) $attribute] = true;
return true;
}
elseif (is_array($attribute) || is_object($attribute)) {
$context[(string) $namespace] = $attribute;
return true;
}
}
// set value if key is valid
if ((is_string($attribute) || is_int($attribute)) && $value) {
$context[$namespace][$attribute] = $value;
return true;
}
}
break;
case CONTEXT_ISSET:
// return entire context
if (!$namespace) return false;
if (!$attribute) {
// return entire space if set
return isset($context[$namespace]);
}
// return val of key from space
return isset($context[$namespace][$attribute]);
case CONTEXT_CLEAR:
$context = array();
return true;
}
return false;
}
/**
* Sets a context by namespace + attribute.
*/
function context_set($namespace, $attribute = null, $value = null) {
return context_context(CONTEXT_SET, $namespace, $attribute, $value);
}
/**
* Retrieves a context by namespace + (optional) attribute.
*/
function context_get($namespace = null, $attribute = null) {
return context_context(CONTEXT_GET, $namespace, $attribute, null);
}
/**
* Returns a boolean for whether a context namespace + attribute have been set.
*/
function context_isset($namespace = null, $attribute = null) {
return context_context(CONTEXT_ISSET, $namespace, $attribute, null);
}
/**
* Deprecated context_exists() function. Retained for backwards
* compatibility -- please use context_isset() instead.
*/
function context_exists($namespace = null, $attribute = null) {
return context_context(CONTEXT_ISSET, $namespace, $attribute, null);
}
/**
* Clears static context array() -- meant only for testing
*/
function context_clear() {
return context_context(CONTEXT_CLEAR);
}
/**
* Implemented hooks ==================================================
*/
/**
* Implementation of hook_init().
*/
function context_init() {
// In general it is advisable to avoid using context_set_by_condition() at
// this stage of the Drupal page load as it caches the condition map.
$current_path = drupal_get_path_alias($_GET['q']);
foreach (context_enabled_contexts() as $identifier => $context) {
// context integration against paths
if (!empty($context->path) && is_array($context->path)) {
$paths = implode("\n", $context->path);
if (drupal_match_path($current_path, $paths)) {
context_set($context->namespace, $context->attribute, $context->value);
The Great Git Migration
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}
}
// context integration for sitewide context
if (!empty($context->sitewide)) {
context_set($context->namespace, $context->attribute, $context->value);
}
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}
}
/**
* Implementation of hook_flush_caches().
*/
function context_flush_caches() {
context_invalidate_cache();
return array();
}
/**
* L'CRUD FUNCTIONS ===================================================
*/
/**
* Context loader.
*
* @param $context
* The parameters to use for loading this context. Can be an integer
* cid or partial context object.
*
* @return
* Returns a fully-loaded context definition.
*/
function context_load_context($context, $reset = FALSE) {
static $cache = array();
// Argument is a cid
if (is_numeric($context)) {
$cid = $context;
if (!isset($cache[$cid])) {
$context = db_fetch_object(db_query("SELECT * FROM {context} WHERE cid = %d", $cid));
}
else {
return $cache[$cid];
}
}
// Context object has an associated cid
else if (is_object($context) && isset($context->cid)) {
$context = db_fetch_object(db_query("SELECT * FROM {context} WHERE cid = %d", $context->cid));
}
// Context object has no cid -- we'll try to load by ns/attr/val
else if (is_object($context) && $context->namespace && $context->attribute && $context->value) {
$args = array($context->namespace, $context->attribute, $context->value);
$context = db_fetch_object(db_query("SELECT * FROM {context} WHERE namespace = '%s' AND attribute = '%s' AND value = '%s'", $args));
}
// Unserialize and populate associations
if (!empty($context->data)) {
$context = context_unpack_context($context);
$cache[$context->cid] = $context;
return $context;
}
return false;
}
/**
* Inserts or updates a context object into the database.
* @TODO: should probably return the new cid on success -- make sure
* this doesn't break any checks elsewhere.
*
* @param $context
* The context object to be inserted.
*
* @return
* Returns true on success, false on failure.
*/
function context_save_context($context) {
// Insert or update the core context definition
if (!isset($context->cid)) {
$existing = context_load_context($context, TRUE);
if ($existing && $existing->cid) {
return false;
}
else {
$context = context_pack_context($context);
drupal_write_record('context', $context);
}
}
else {
$context = context_pack_context($context);
drupal_write_record('context', $context, 'cid');
}
// Invalidate context cache
cache_clear_all('context', 'cache');
return TRUE;
}
/**
* Deletes an existing context.
*
* @param $context
* The context object to be deleted. The $context->cid property is
* necessary for this operation.
*
* @return
* Returns true on success, false on failure.
*/
function context_delete_context($context) {
if ($context = context_load_context($context, TRUE)) {
db_query("DELETE FROM {context} WHERE cid = %d", $context->cid);
// Invalidate context cache
cache_clear_all('context', 'cache');
return true;
}
return false;
}
/**
* Helper function to pack a context object to be stored in the database.
*/
function context_pack_context($context) {
$packed = new StdClass();
$packed->cid = $context->cid;
$packed->namespace = $context->namespace;
$packed->attribute = $context->attribute;
$packed->value = $context->value;
unset($context->cid);
unset($context->namespace);
unset($context->attribute);
unset($context->value);
// Clear out storage and status information
unset($context->type);
unset($context->status);
// Serialize associations as data array
$context = (array) $context;
$packed->data = serialize($context);
return $packed;
}
/**
* Helper function to unpack a context object that has been retrieved from the database.
* @TODO: Remove this once ->conditions and ->reactions issue has been resolved.
*/
function context_unpack_context($context) {
if (!empty($context->data)) {
$data = unserialize($context->data);
foreach ($data as $k => $v) {
$context->{$k} = $v;
}
unset($context->data);
}
return $context;
}
/**
* API FUNCTIONS ======================================================
*/
/**
* Provides an array of all contexts provided by modules and in the database.
*
* @param $reset
* Boolean to clear the static cached array of contexts.
*
* @return
* An array of context objects.
*/
function context_contexts($reset = FALSE) {
static $contexts;
if (!$contexts || $reset) {
$contexts = array();
foreach (module_implements('context_default_contexts') as $module) {
$function = $module .'_context_default_contexts';
$c = call_user_func($function);
if (!empty($c)) {
foreach ($c as $context) {
$context = (object) $context;
$context->type = CONTEXT_STORAGE_DEFAULT;
$identifier = "{$context->namespace}-{$context->attribute}-{$context->value}";
$contexts[$identifier] = $context;
}
}
}
// Allow other modules to alter contexts
drupal_alter('context_default_contexts', $contexts);
// Collect normal & overridden contexts
$result = db_query("SELECT * FROM {context} ORDER BY namespace ASC, attribute ASC, value ASC");
while ($context = db_fetch_object($result)) {
$context = context_unpack_context($context);
$key = "{$context->namespace}-{$context->attribute}-{$context->value}";
if (isset($contexts[$key])) {
$contexts[$key] = $context;
$contexts[$key]->type = CONTEXT_STORAGE_OVERRIDDEN;
}
else {
$contexts[$key] = $context;
$contexts[$key]->type = CONTEXT_STORAGE_NORMAL;
}
}
// Mark the status of each context
foreach ($contexts as $key => $context) {
$contexts[$key]->status = context_status($context);
}
}
return $contexts;
}
/**
* Wrapper around cache_get() to make it easier for context to pull different
* datastores from a single cache row.
*/
function context_cache_get($key, $reset = FALSE) {
static $cache;
if (!isset($cache) || $reset) {
$cache = cache_get('context', 'cache');
$cache = $cache ? $cache->data : array();
}
return !empty($cache[$key]) ? $cache[$key] : FALSE;
}
/**
* Wrapper around cache_set() to make it easier for context to write different
* datastores to a single cache row.
*/
function context_cache_set($key, $value) {
$cache = cache_get('context', 'cache');
$cache = $cache ? $cache->data : array();
$cache[$key] = $value;
cache_set('context', $cache);
}
/**
* Retrieves all enabled contexts from the cache.
*/
function context_enabled_contexts($namespace = NULL, $reset = FALSE) {
static $enabled;
static $namespaces;
if (!isset($enabled) || $reset) {
$enabled = array();
$cache = context_cache_get('enabled');
if ($cache && !$reset) {
$enabled = $cache;
}
else {
$contexts = context_contexts(TRUE);
foreach ($contexts as $context) {
if (context_status($context) == CONTEXT_STATUS_ENABLED) {
$identifier = "{$context->namespace}-{$context->attribute}-{$context->value}";
$enabled[$identifier] = $context;
}
}
// Set the cache
context_cache_set('enabled', $enabled);
}
foreach ($enabled as $identifier => $context) {
if (!isset($namespaces[$context->namespace])) {
$namespaces[$context->namespace] = array();
}
$namespaces[$context->namespace][$identifier] = $context;
}
}
if (!empty($namespace)) {
return !empty($namespaces[$namespace]) ? $namespaces[$namespace] : array();
}
return $enabled;
}
/**
* Loads any active contexts with associated reactions. This should be run
* at a late stage of the page load to ensure that relevant contexts have been set.
*/
function context_active_contexts($reset = FALSE) {
static $contexts;
if (!isset($contexts) || $reset) {
$contexts = array();
$cache = context_enabled_contexts();
foreach ($cache as $context) {
if (context_get($context->namespace, $context->attribute) == $context->value) {
$identifier = "{$context->namespace}-{$context->attribute}-{$context->value}";
$contexts[$identifier] = $context;
}
}
drupal_alter('context_active_contexts', $contexts);
}
return $contexts;
}
/**
* Loads an associative array of conditions => context identifiers to allow
* contexts to be set by different conditions. Called by context_set_by_condition().
*/
function context_condition_map($reset = FALSE) {
static $condition_map;
if (!isset($condition_map) || $reset) {
$cache = context_cache_get('condition_map');
if ($cache && !$reset) {
$condition_map = $cache;
}
else {
$enabled = context_enabled_contexts();
foreach (array_keys(context_conditions()) as $condition) {
$condition_map[$condition] = array();
foreach ($enabled as $identifier => $context) {
if (!empty($context->{$condition})) {
if (is_array($context->{$condition})) {
foreach ($context->{$condition} as $value) {
if (!isset($condition_map[$condition][$value])) {
$condition_map[$condition][$value] = array();
}
$condition_map[$condition][$value][] = $identifier;
}
}
else if (is_string($context->{$condition})) {
$value = $context->{$condition};
if (!isset($condition_map[$condition][$value])) {
$condition_map[$condition][$value] = array();
}
$condition_map[$condition][$value][] = $identifier;
}
}
}
}
context_cache_set('condition_map', $condition_map);
}
}
return $condition_map;
}
/**
* Builds an array of values based on the current active contexts and group
* by conditions/reactions.
*
* @param $type
* The condition or reaction type to pull values for.
* @param $reset
* Boolean value for resetting the static cache.
*
* @return
* Returns a keyed array of reactions and values.
*/
function context_active_values($type = NULL, $reset = FALSE) {
static $value_map;
if (!isset($value_map) || $reset) {
$value_map = array();
// This sucks... @TODO: fix it!!!
$keys = array_merge(array_keys(context_reactions()), array_keys(context_conditions()));
$keys[] = 'block';
foreach ($keys as $key) {
foreach (context_active_contexts() as $identifier => $context) {
if (!empty($context->{$key})) {
if (!isset($value_map[$key])) {
$value_map[$key] = array();
}
if (is_array($context->{$key})) {
$value_map[$key] = array_merge($value_map[$key], $context->{$key});
}
else {
$value_map[$key][] = $context->{$key};
}
}
}
}
}
if (!empty($type)) {
return !empty($value_map[$type]) ? $value_map[$type] : array();
}
return $value_map;
}
/**
* Returns status for whether a given context definition is enabled.
*/
function context_status($context) {
$status = variable_get('context_status', array());
$identifier = "{$context->namespace}-{$context->attribute}-{$context->value}";
if (isset($status[$identifier]) && !$status[$identifier]) {
return CONTEXT_STATUS_DISABLED;
}
return CONTEXT_STATUS_ENABLED;
}
/**
* Invalidates all context caches().
*/
function context_invalidate_cache() {
cache_clear_all('context', 'cache');
}
/**
* Invokes hook_context_conditions() to provide an array of conditions that may be associated with a context.
*/
function context_conditions($reset = FALSE) {
static $conditions;
if (!isset($conditions) || $reset) {
$cache = context_cache_get('conditions');
if ($cache && !$reset) {
$conditions = $cache;
}
else {
$conditions = module_invoke_all('context_conditions');
context_cache_set('conditions', $conditions);
}
}
return $conditions;
}
/**
* Invokes hook_context_reactions() to provide an array of reactions that may be associated with a context.
*/
function context_reactions($reset = FALSE) {
static $reactions;
if (!isset($reactions) || $reset) {
$cache = context_cache_get('reactions');
if ($cache && !$reset) {
$reactions = $cache;
}
else {
$reactions = module_invoke_all('context_reactions');
context_cache_set('reactions', $reactions);
}
}
return $reactions;
}
/**
* Sets a namespace-attribute-value context that has been associated with the provided condition.
*
* @param $type
* The condition type to be matched.
* @param $id
* A value to match against.
* @param $force
* Boolean param to force the setting of a context value even if a value for
* the found namespace/attribute is already set. Defaults to FALSE.
*
* @return
* True if one or more contexts were set. False if no items/contexts matched.
*/
function context_set_by_condition($type, $id, $force = FALSE) {
$map = context_condition_map();
$set = FALSE;
if (!empty($map[$type]) && !empty($map[$type][$id])) {
$contexts = context_enabled_contexts();
$identifiers = $map[$type][$id];
foreach ($identifiers as $identifier) {
$context = !empty($contexts[$identifier]) ? $contexts[$identifier] : FALSE;
if ($context) {
// If this context already has a value, don't alter it.
if (!context_isset($context->namespace, $context->attribute) || $force) {
context_set($context->namespace, $context->attribute, $context->value);
$set = TRUE;
}
}
}
}
return $set;
}
/**
* Recursive helper function to determine whether an array and its
* children are entirely empty.
*/
function context_empty($element) {
$empty = TRUE;
if (is_array($element)) {
foreach ($element as $child) {
$empty = $empty && context_empty($child);
}
}
else {
$empty = $empty && empty($element);
}
return $empty;
}
/**
* Export a variable.
*/
function context_var_export($var, $prefix = '', $multiple = TRUE) {
if (is_array($var)) {
if (empty($var)) {
$output = 'array()';
}
else {
$output = "array(\n";
foreach ($var as $key => $value) {
$output .= " '$key' => ". context_var_export($value, $prefix . ($multiple? '' : ' ')) .",\n";
}
$output .= ')';
}
}
else if (is_bool($var)) {
$output = $var ? 'TRUE' : 'FALSE';
}
else {
$output = var_export($var, TRUE);
}
if ($prefix) {
$output = str_replace("\n", "\n$prefix", $output);
}
return $output;
}