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Faster page and cat walker. Props hailin. see #5458

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git-svn-id: http://svn.automattic.com/wordpress/trunk@6384 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
ryan 2007-12-14 21:46:52 +00:00
parent 85267d4d17
commit ce1ac877cf
1 changed files with 98 additions and 85 deletions
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183
wp-includes/classes.php
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@ -386,9 +386,10 @@ function is_wp_error($thing) {
return false;
}
// A class for displaying various tree-like structures. Extend the Walker class to use it, see examples at the bottom
/*
* A class for displaying various tree-like structures.
* Extend the Walker class to use it, see examples at the bottom
*/
class Walker {
var $tree_type;
var $db_fields;
@ -399,94 +400,106 @@ class Walker {
function start_el($output) { return $output; }
function end_el($output) { return $output; }
function walk($elements, $to_depth) {
$args = array_slice(func_get_args(), 2); $parents = array(); $depth = 1; $previous_element = ''; $output = '';
/*
* display one element if the element doesn't have any children
* otherwise, display the element and its children
*/
function display_element( $element, &$children_elements, $max_depth, $depth=0, $args, $output ) {
if ( !$element)
return $output;
if ( $max_depth != 0 ) {
if ($depth >= $max_depth)
return $output;
}
$id_field = $this->db_fields['id'];
$parent_field = $this->db_fields['parent'];
//display this element
$cb_args = array_merge( array($output, $element, $depth), $args);
$output = call_user_func_array(array(&$this, 'start_el'), $cb_args);
//padding at the end
$last_element->post_parent = 0;
$last_element->post_id = 0;
$elements[] = $last_element;
if ( !$children_elements ) {
//close off this element
$cb_args = array_merge( array($output, $element, $depth), $args);
$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
return $output;
}
for ( $i = 0; $i < sizeof( $children_elements ); $i++ ) {
$child = $children_elements[$i];
if ( $child->$parent_field == $element->$id_field ) {
array_splice( $children_elements, $i, 1 );
//start the child delimiter
$cb_args = array_merge( array($output, $depth), $args);
$output = call_user_func_array(array(&$this, 'start_lvl'), $cb_args);
$output = $this->display_element( $child, $children_elements, $max_depth, $depth + 1, $args, $output );
//end the child delimiter
$cb_args = array_merge( array($output, $depth), $args);
$output = call_user_func_array(array(&$this, 'end_lvl'), $cb_args);
$i--;
}
}
return $output;
}
/*
* displays array of elements hierarchically
* max_depth = -1 means flatly display every element
* max_depth = 0 means display all levels
* max_depth > 0 specifies the number of display levels.
*/
function walk( $elements, $max_depth) {
$args = array_slice(func_get_args(), 2);
$output = '';
$id_field = $this->db_fields['id'];
$parent_field = $this->db_fields['parent'];
$flat = ($to_depth == -1) ? true : false;
foreach ( $elements as $element ) {
// If flat, start and end the element and skip the level checks.
if ( $flat) {
// Start the element.
if ( isset($element->$id_field) && $element->$id_field != 0 ) {
$cb_args = array_merge( array($output, $element, $depth - 1), $args);
$output = call_user_func_array(array(&$this, 'start_el'), $cb_args);
}
// End the element.
if ( isset($element->$id_field) && $element->$id_field != 0 ) {
$cb_args = array_merge( array($output, $element, $depth - 1), $args);
$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
}
continue;
}
// Walk the tree.
if ( !empty($previous_element) && ($element->$parent_field == $previous_element->$id_field) ) {
// Previous element is my parent. Descend a level.
array_unshift($parents, $previous_element);
if ( !$to_depth || ($depth < $to_depth) ) { //only descend if we're below $to_depth
$cb_args = array_merge( array($output, $depth), $args);
$output = call_user_func_array(array(&$this, 'start_lvl'), $cb_args);
} else if ( $to_depth && $depth == $to_depth ) { // If we've reached depth, end the previous element.
$cb_args = array_merge( array($output, $previous_element, $depth), $args);
$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
}
$depth++; //always do this so when we start the element further down, we know where we are
} else if ( $element->$parent_field == $previous_element->$parent_field) {
// On the same level as previous element.
if ( !$to_depth || ($depth <= $to_depth) ) {
$cb_args = array_merge( array($output, $previous_element, $depth - 1), $args);
$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
}
} else if ( $depth > 1 ) {
// Ascend one or more levels.
if ( !$to_depth || ($depth <= $to_depth) ) {
$cb_args = array_merge( array($output, $previous_element, $depth - 1), $args);
$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
}
while ( $parent = array_shift($parents) ) {
$depth--;
if ( !$to_depth || ($depth < $to_depth) ) {
$cb_args = array_merge( array($output, $depth), $args);
$output = call_user_func_array(array(&$this, 'end_lvl'), $cb_args);
$cb_args = array_merge( array($output, $parent, $depth - 1), $args);
$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
}
if ( $element->$parent_field == $parents[0]->$id_field ) {
break;
}
}
} else if ( !empty($previous_element) ) {
// Close off previous element.
if ( !$to_depth || ($depth <= $to_depth) ) {
$cb_args = array_merge( array($output, $previous_element, $depth - 1), $args);
$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
}
}
// Start the element.
if ( !$to_depth || ($depth <= $to_depth) ) {
if ( $element->$id_field != 0 ) {
$cb_args = array_merge( array($output, $element, $depth - 1), $args);
$output = call_user_func_array(array(&$this, 'start_el'), $cb_args);
}
}
$previous_element = $element;
$flat = ($max_depth == -1) ? true : false;
if ( $flat ) {
$empty_array = array();
foreach ( $elements as $e )
$output = $this->display_element( $e, $empty_array, 1, 0, $args, $output );
return $output;
}
return $output;
/*
* need to display in hierarchical order
* splice elements into two buckets: those without parent and those with parent
*/
$top_level_elements = array();
$children_elements = array();
foreach ( $elements as $e) {
if ( 0 == $e->$parent_field )
$top_level_elements[] = $e;
else
$children_elements[] = $e;
}
foreach ( $top_level_elements as $e )
$output = $this->display_element( $e, $children_elements, $max_depth, 0, $args, $output );
/*
* if we are displaying all levels, and remaining children_elements is not empty,
* then we got orphans, which should be displayed regardless
*/
if ( ( $max_depth == 0 ) && sizeof( $children_elements ) > 0 ) {
$empty_array = array();
foreach ( $children_elements as $orphan_e )
$output = $this->display_element( $orphan_e, $empty_array, 1, 0, $args, $output );
}
return $output;
}
}