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Filename : AutocompleterAggregate.php
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<?php

/**
 * Hoa
 *
 *
 * @license
 *
 * New BSD License
 *
 * Copyright © 2007-2017, Hoa community. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Hoa nor the names of its contributors may be
 *       used to endorse or promote products derived from this software without
 *       specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

namespace Psy\Readline\Hoa;

/**
 * Class \Hoa\Console\Readline\Autocompleter\Aggregate.
 *
 * Aggregate several autocompleters.
 */
class AutocompleterAggregate implements Autocompleter
{
    /**
     * List of autocompleters.
     */
    protected $_autocompleters = null;

    /**
     * Constructor.
     */
    public function __construct(array $autocompleters)
    {
        $this->setAutocompleters($autocompleters);

        return;
    }

    /**
     * Complete a word.
     * Returns null for no word, a full-word or an array of full-words.
     */
    public function complete(&$prefix)
    {
        foreach ($this->getAutocompleters() as $autocompleter) {
            $preg = \preg_match(
                '#('.$autocompleter->getWordDefinition().')$#u',
                $prefix,
                $match
            );

            if (0 === $preg) {
                continue;
            }

            $_prefix = $match[0];

            if (null === $out = $autocompleter->complete($_prefix)) {
                continue;
            }

            $prefix = $_prefix;

            return $out;
        }

        return null;
    }

    /**
     * Set/initialize list of autocompleters.
     */
    protected function setAutocompleters(array $autocompleters)
    {
        $old = $this->_autocompleters;
        $this->_autocompleters = new \ArrayObject($autocompleters);

        return $old;
    }

    /**
     * Get list of autocompleters.
     */
    public function getAutocompleters()
    {
        return $this->_autocompleters;
    }

    /**
     * Get definition of a word.
     */
    public function getWordDefinition(): string
    {
        return '.*';
    }
}