File Validator/Type.php | ICanBoogie/Validate v0.1.0

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<?php

/*
 * This file is part of the ICanBoogie package.
 *
 * (c) Olivier Laviale <olivier.laviale@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace ICanBoogie\Validate\Validator;

use ICanBoogie\Validate\Context;

/**
 * Validates that a value is of a specific type.
 */
class Type extends AbstractValidator
{
    const ALIAS = 'type';
    const DEFAULT_MESSAGE = "should be of type {type}";

    const PARAM_TYPE = 'type';

    /**
     * Mapping for `is_*` and `ctype_*` functions.
     *
     * @var array
     */
    static private $mapping = [

        'is' => [ 'array', 'bool', 'double', 'float', 'int', 'integer', 'long',
            'null', 'numeric', 'object', 'real', 'resource', 'scalar', 'string' ],

        'ctype' => [ 'alnum', 'alpha', 'cntrl', 'digit', 'graph', 'lower',
            'print', 'punct', 'space', 'upper', 'xdigit' ]

    ];

    /**
     * @inheritdoc
     */
    public function validate($value, Context $context)
    {
        $context->message_args[self::PARAM_TYPE] = $type = $context->param(self::PARAM_TYPE);
        $callable = $this->resolve_callable($this->normalize_type($type));

        if ($callable)
        {
            return $callable($value);
        }

        return $value instanceof $type;
    }

    /**
     * @inheritdoc
     */
    protected function get_params_mapping()
    {
        return [ self::PARAM_TYPE ];
    }

    /**
     * Normalizes type.
     *
     * @param string $type
     *
     * @return string
     */
    protected function normalize_type($type)
    {
        $type = strtolower($type);

        if ($type == 'boolean')
        {
            $type = 'bool';
        }

        return $type;
    }

    /**
     * Resolves callable to validate type.
     *
     * @param string $type
     *
     * @return string|null
     */
    protected function resolve_callable($type)
    {
        foreach (self::$mapping as $prefix => $types)
        {
            if (in_array($type, $types))
            {
                return "{$prefix}_{$type}";
            }
        }

        return null;
    }
}

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