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<?php namespace ProcessWire;

/**
 * A WireArray of Inputfield instances, as used by InputfieldWrapper. 
 *
 * The default numeric indexing of a WireArray is not overridden.
 *
 * ProcessWire 3.x, Copyright 2016 by Ryan Cramer
 * https://processwire.com
 *
 */

class InputfieldsArray extends WireArray {

    /**
     * Per WireArray interface, only Inputfield instances are accepted.
     * 
     * @param Wire $item
     * @return bool
     *
     */
    public function isValidItem($item) {
        return $item instanceof Inputfield;
    }

    /**
     * Extends the find capability of WireArray to descend into the Inputfield children
     * 
     * @param string $selector
     * @return WireArray|InputfieldsArray
     *
     */
    public function find($selector) {
        $a = parent::find($selector);
        foreach($this as $item) {
            if(!$item instanceof InputfieldWrapper) continue;
            $children = $item->children();
            if(count($children)) $a->import($children->find($selector));
        }
        return $a;
    }

    public function makeBlankItem() {
        return null; // Inputfield is abstract, so there is nothing to return here
    }

    public function usesNumericKeys() {
        return true;
    }

}