Namespaces

• ICanBoogie
  • CLDR
    • Plurals
    • Units

Classes

• Operands
• Relation
• Rule
• Samples

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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\CLDR\Plurals;

/**
 * Representation of plural samples.
 *
 * @see http://unicode.org/reports/tr35/tr35-25-numbers.html#Language_Plural_Rules
 */
final class Rule
{
    /**
     * @var array
     */
    static private $instances = [];

    /**
     * @param string $rule
     *
     * @return Rule
     */
    static public function from($rule)
    {
        $instance = &self::$instances[$rule];

        return $instance ?: $instance = new static(self::parse_rule($rule));
    }

    /**
     * @param string $rules
     *
     * @return Relation[][]
     */
    static private function parse_rule($rules)
    {
        $rules = self::extract_rule($rules);

        array_walk_recursive($rules, function (&$rule) {

            $rule = Relation::from($rule);

        });

        return $rules;
    }

    /**
     * @param string $rule
     *
     * @return array An array of ands[ors][]
     */
    static private function extract_rule($rule)
    {
        return array_map(function ($rule) {

            return explode(' and ', $rule);

        }, explode(' or ', $rule));
    }

    /**
     * @var Relation[][]
     */
    private $relations;

    /**
     * @param Relation[][] $relations
     */
    private function __construct(array $relations)
    {
        $this->relations = $relations;
    }

    /**
     * @param number $number
     *
     * @return bool `true` if the number matches the rules, `false` otherwise.
     */
    public function validate($number)
    {
        $relations = $this->relations;
        $operands = Operands::from($number);

        // replace the relations with their evaluations
        array_walk_recursive($relations, function (Relation &$relation) use ($operands) {

            $relation = $relation->evaluate($operands);

        });

        $relations = array_map(function ($evaluations) {

            return !in_array(false, $evaluations);

        }, $relations);

        return in_array(true, $relations);
    }
}