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Introduce doing_filter() and doing_action() to identify hooks in progress. 

did_action() returns true the moment a hook is initially run, leaving you no way to tell if the hook is still in progress. Hooks can be nested and this checks the entire stack, versus current_filter() which only identifies the final hook in the stack. This commit also introduces current_action() for parity.

To tell if a hook has completed, one can use did_action() and ! doing_action() together.

The functions do not require an argument. In that situation, they indicate whether the stack is empty.

props ericmann for the initial unit tests.
fixes #14994.


git-svn-id: https://develop.svn.wordpress.org/trunk@27294 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Andrew Nacin 2014-02-26 18:43:59 +00:00
parent 139dedb474
commit 68c8b9cf0f
2 changed files with 155 additions and 0 deletions
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55
src/wp-includes/plugin.php
View File

@ -324,6 +324,61 @@ function current_filter() {
return end( $wp_current_filter );
}
/**
* Retrieve the name of the current action.
*
* @since 3.9.0
* @uses current_filter()
*
* @return string Hook name of the current action.
*/
function current_action() {
return current_filter();
}
/**
* Retrieve the name of a filter currently being processed.
*
* The function current_filter() only returns the most recent filter or action
* being executed. did_action() returns true once the action is initially
* processed. This function allows detection for any filter currently being
* executed (despite not being the most recent filter to fire, in the case of
* hooks called from hook callbacks) to be verified.
*
* @since 3.9.0
* @see current_filter()
* @see did_action()
*
* @param string $filter Optional. Filter to check. Defaults to null, which checks if any filter is currently being run.
*
* @global array $wp_current_filter
*
* @return bool Whether the filter is currently in the stack
*/
function doing_filter( $filter = null ) {
global $wp_current_filter;
if ( null === $filter ) {
return ! empty( $wp_current_filter );
}
return in_array( $filter, $wp_current_filter );
}
/**
* Retrieve the name of an action currently being processed.
*
* @since 3.9.0
* @uses doing_filter()
*
* @param string $action Optional. Action to check. Defaults to null, which checks if any action is currently being run.
*
* @return bool Whether the action is currently in the stack.
*/
function doing_action( $action = null ) {
return doing_filter( $action );
}
/**
* Hooks a function on to a specific action.
*

100
tests/phpunit/tests/actions.php
View File

@ -256,4 +256,104 @@ class Tests_Actions extends WP_UnitTestCase {
function action_self_removal() {
remove_action( 'test_action_self_removal', array( $this, 'action_self_removal' ) );
}
/**
* Make sure current_action() behaves as current_filter()
*
* @ticket 14994
*/
function test_current_action() {
global $wp_current_filter;
$wp_current_filter[] = 'first';
$wp_current_filter[] = 'second'; // Let's say a second action was invoked.
$this->assertEquals( 'second', current_action() );
}
/**
* @ticket 14994
*/
function test_doing_filter() {
global $wp_current_filter;
$wp_current_filter = array(); // Set to an empty array first
$this->assertFalse( doing_filter() ); // No filter is passed in, and no filter is being processed
$this->assertFalse( doing_filter( 'testing' ) ); // Filter is passed in but not being processed
$wp_current_filter[] = 'testing';
$this->assertTrue( doing_filter() ); // No action is passed in, and a filter is being processed
$this->assertTrue( doing_filter( 'testing') ); // Filter is passed in and is being processed
$this->assertFalse( doing_filter( 'something_else' ) ); // Filter is passed in but not being processed
$wp_current_filter = array();
}
/**
* @ticket 14994
*/
function test_doing_action() {
global $wp_current_filter;
$wp_current_filter = array(); // Set to an empty array first
$this->assertFalse( doing_action() ); // No action is passed in, and no filter is being processed
$this->assertFalse( doing_action( 'testing' ) ); // Action is passed in but not being processed
$wp_current_filter[] = 'testing';
$this->assertTrue( doing_action() ); // No action is passed in, and a filter is being processed
$this->assertTrue( doing_action( 'testing') ); // Action is passed in and is being processed
$this->assertFalse( doing_action( 'something_else' ) ); // Action is passed in but not being processed
$wp_current_filter = array();
}
/**
* @ticket 14994
*/
function test_doing_filter_real() {
$this->assertFalse( doing_filter() ); // No filter is passed in, and no filter is being processed
$this->assertFalse( doing_filter( 'testing' ) ); // Filter is passed in but not being processed
add_filter( 'testing', array( $this, 'apply_testing_filter' ) );
$this->assertTrue( has_action( 'testing' ) );
$this->assertEquals( 10, has_action( 'testing', array( $this, 'apply_testing_filter' ) ) );
apply_filters( 'testing', '' );
// Make sure it ran.
$this->assertTrue( $this->apply_testing_filter );
$this->assertFalse( doing_filter() ); // No longer doing any filters
$this->assertFalse( doing_filter( 'testing' ) ); // No longer doing this filter
}
function apply_testing_filter() {
$this->apply_testing_filter = true;
$this->assertTrue( doing_filter() );
$this->assertTrue( doing_filter( 'testing' ) );
$this->assertFalse( doing_filter( 'something_else' ) );
$this->assertFalse( doing_filter( 'testing_nested' ) );
add_filter( 'testing_nested', array( $this, 'apply_testing_nested_filter' ) );
$this->assertTrue( has_action( 'testing_nested' ) );
$this->assertEquals( 10, has_action( 'testing_nested', array( $this, 'apply_testing_nested_filter' ) ) );
apply_filters( 'testing_nested', '' );
// Make sure it ran.
$this->assertTrue( $this->apply_testing_nested_filter );
$this->assertFalse( doing_filter( 'testing_nested' ) );
$this->assertFalse( doing_filter( 'testing_nested' ) );
}
function apply_testing_nested_filter() {
$this->apply_testing_nested_filter = true;
$this->assertTrue( doing_filter() );
$this->assertTrue( doing_filter( 'testing' ) );
$this->assertTrue( doing_filter( 'testing_nested' ) );
$this->assertFalse( doing_filter( 'something_else' ) );
}
}