3b7c4f692e
Closures are not the only types of callable objects in PHP. Specifically, any string referencing a valid function, any object with a __call(), or any class with a __callStatic() can all be called. Therefore, removed type hinting for Closures in places where a callable is expected. (Unfortunately, the callable type-hint only comes in PHP 5.4.) Change-Id: I6bff7e4a95716ef63aa7e07d3d9fef6d20eb65a6
96 lines
2.5 KiB
PHP
96 lines
2.5 KiB
PHP
<?php
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/**
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* Convenience class for generating iterators from iterators.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @author Aaron Schulz
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*/
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/**
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* Convenience class for generating iterators from iterators.
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*
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* @since 1.21
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*/
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class MappedIterator implements Iterator {
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/** @var Iterator */
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protected $baseIterator;
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/** @var callable */
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protected $vCallback;
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/**
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* Build an new iterator from a base iterator by having the former wrap the
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* later, returning the result of "value" callback for each current() invocation.
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* The callback takes the result of current() on the base iterator as an argument.
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* The keys of the base iterator are reused verbatim.
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*
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* @param Iterator|Array $iter
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* @param callable $vCallback
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* @throws MWException
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*/
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public function __construct( $iter, $vCallback ) {
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if ( is_array( $iter ) ) {
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$this->baseIterator = new ArrayIterator( $iter );
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} elseif ( $iter instanceof Iterator ) {
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$this->baseIterator = $iter;
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} else {
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throw new MWException( "Invalid base iterator provided." );
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}
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$this->vCallback = $vCallback;
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}
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/**
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* @return void
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*/
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public function rewind() {
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$this->baseIterator->rewind();
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}
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/**
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* @return Mixed|null Returns null if out of range
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*/
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public function current() {
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if ( !$this->baseIterator->valid() ) {
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return null; // out of range
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}
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return call_user_func_array( $this->vCallback, array( $this->baseIterator->current() ) );
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}
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/**
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* @return Mixed|null Returns null if out of range
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*/
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public function key() {
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if ( !$this->baseIterator->valid() ) {
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return null; // out of range
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}
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return $this->baseIterator->key();
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}
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/**
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* @return void
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*/
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public function next() {
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$this->baseIterator->next();
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}
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/**
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* @return bool
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*/
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public function valid() {
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return $this->baseIterator->valid();
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}
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}
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