268 lines
6.3 KiB
PHP
268 lines
6.3 KiB
PHP
<?php
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/**
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* WordPress List utility class
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*
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* @package WordPress
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* @since 4.7.0
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*/
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/**
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* List utility.
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*
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* Utility class to handle operations on an array of objects.
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*
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* @since 4.7.0
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*/
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class WP_List_Util {
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/**
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* The input array.
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*
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* @since 4.7.0
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* @access private
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* @var array
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*/
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private $input = array();
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/**
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* The output array.
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*
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* @since 4.7.0
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* @access private
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* @var array
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*/
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private $output = array();
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/**
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* Temporary arguments for sorting.
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*
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* @since 4.7.0
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* @access private
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* @var array
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*/
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private $orderby = array();
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/**
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* Constructor.
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*
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* Sets the input array.
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*
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* @since 4.7.0
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*
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* @param array $input Array to perform operations on.
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*/
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public function __construct( $input ) {
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$this->output = $this->input = $input;
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}
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/**
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* Returns the original input array.
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*
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* @since 4.7.0
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* @access public
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*
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* @return array The input array.
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*/
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public function get_input() {
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return $this->input;
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}
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/**
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* Returns the output array.
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*
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* @since 4.7.0
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* @access public
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*
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* @return array The output array.
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*/
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public function get_output() {
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return $this->output;
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}
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/**
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* Filters the list, based on a set of key => value arguments.
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*
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* @since 4.7.0
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*
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* @param array $args Optional. An array of key => value arguments to match
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* against each object. Default empty array.
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* @param string $operator Optional. The logical operation to perform. 'AND' means
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* all elements from the array must match. 'OR' means only
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* one element needs to match. 'NOT' means no elements may
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* match. Default 'AND'.
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* @return array Array of found values.
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*/
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public function filter( $args = array(), $operator = 'AND' ) {
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if ( empty( $args ) ) {
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return $this->output;
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}
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$operator = strtoupper( $operator );
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if ( ! in_array( $operator, array( 'AND', 'OR', 'NOT' ), true ) ) {
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return array();
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}
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$count = count( $args );
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$filtered = array();
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foreach ( $this->output as $key => $obj ) {
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$to_match = (array) $obj;
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$matched = 0;
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foreach ( $args as $m_key => $m_value ) {
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if ( array_key_exists( $m_key, $to_match ) && $m_value == $to_match[ $m_key ] ) {
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$matched++;
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}
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}
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if (
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( 'AND' == $operator && $matched == $count ) ||
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( 'OR' == $operator && $matched > 0 ) ||
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( 'NOT' == $operator && 0 == $matched )
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) {
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$filtered[$key] = $obj;
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}
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}
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$this->output = $filtered;
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return $this->output;
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}
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/**
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* Plucks a certain field out of each object in the list.
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*
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* This has the same functionality and prototype of
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* array_column() (PHP 5.5) but also supports objects.
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*
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* @since 4.7.0
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*
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* @param int|string $field Field from the object to place instead of the entire object
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* @param int|string $index_key Optional. Field from the object to use as keys for the new array.
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* Default null.
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* @return array Array of found values. If `$index_key` is set, an array of found values with keys
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* corresponding to `$index_key`. If `$index_key` is null, array keys from the original
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* `$list` will be preserved in the results.
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*/
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public function pluck( $field, $index_key = null ) {
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if ( ! $index_key ) {
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/*
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* This is simple. Could at some point wrap array_column()
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* if we knew we had an array of arrays.
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*/
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foreach ( $this->output as $key => $value ) {
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if ( is_object( $value ) ) {
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$this->output[ $key ] = $value->$field;
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} else {
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$this->output[ $key ] = $value[ $field ];
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}
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}
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return $this->output;
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}
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/*
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* When index_key is not set for a particular item, push the value
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* to the end of the stack. This is how array_column() behaves.
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*/
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$newlist = array();
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foreach ( $this->output as $value ) {
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if ( is_object( $value ) ) {
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if ( isset( $value->$index_key ) ) {
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$newlist[ $value->$index_key ] = $value->$field;
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} else {
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$newlist[] = $value->$field;
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}
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} else {
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if ( isset( $value[ $index_key ] ) ) {
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$newlist[ $value[ $index_key ] ] = $value[ $field ];
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} else {
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$newlist[] = $value[ $field ];
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}
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}
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}
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$this->output = $newlist;
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return $this->output;
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}
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/**
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* Sorts the list, based on one or more orderby arguments.
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*
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* @since 4.7.0
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*
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* @param string|array $orderby Optional. Either the field name to order by or an array
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* of multiple orderby fields as $orderby => $order.
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* @param string $order Optional. Either 'ASC' or 'DESC'. Only used if $orderby
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* is a string.
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* @param bool $preserve_keys Optional. Whether to preserve keys. Default false.
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* @return array The sorted array.
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*/
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public function sort( $orderby = array(), $order = 'ASC', $preserve_keys = false ) {
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if ( empty( $orderby ) ) {
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return $this->output;
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}
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if ( is_string( $orderby ) ) {
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$orderby = array( $orderby => $order );
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}
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foreach ( $orderby as $field => $direction ) {
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$orderby[ $field ] = 'DESC' === strtoupper( $direction ) ? 'DESC' : 'ASC';
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}
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$this->orderby = $orderby;
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if ( $preserve_keys ) {
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uasort( $this->output, array( $this, 'sort_callback' ) );
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} else {
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usort( $this->output, array( $this, 'sort_callback' ) );
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}
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$this->orderby = array();
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return $this->output;
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}
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/**
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* Callback to sort the list by specific fields.
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*
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* @since 4.7.0
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* @access private
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*
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* @see WP_List_Util::sort()
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*
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* @param object|array $a One object to compare.
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* @param object|array $b The other object to compare.
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* @return int 0 if both objects equal. -1 if second object should come first, 1 otherwise.
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*/
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private function sort_callback( $a, $b ) {
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if ( empty( $this->orderby ) ) {
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return 0;
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}
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$a = (array) $a;
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$b = (array) $b;
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foreach ( $this->orderby as $field => $direction ) {
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if ( ! isset( $a[ $field ] ) || ! isset( $b[ $field ] ) ) {
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continue;
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}
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if ( $a[ $field ] == $b[ $field ] ) {
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continue;
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}
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$results = 'DESC' === $direction ? array( 1, -1 ) : array( -1, 1 );
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if ( is_numeric( $a[ $field ] ) && is_numeric( $b[ $field ] ) ) {
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return ( $a[ $field ] < $b[ $field ] ) ? $results[0] : $results[1];
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}
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return 0 > strcmp( $a[ $field ], $b[ $field ] ) ? $results[0] : $results[1];
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}
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return 0;
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}
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}
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