add SimpleFilterResolver

src/Resolver/FilterResolvers/SimpleFilterResolver.php

@@ -0,0 +1,65 @@
+<?php declare(strict_types = 1);
+
+namespace Contributte\Imagist\Resolver\FilterResolvers;
+
+use Contributte\Imagist\Filter\FilterInterface;
+use Contributte\Imagist\Resolver\FilterResolverInterface;
+use LogicException;
+
+final class SimpleFilterResolver implements FilterResolverInterface
+{
+
+	private const MAX_LENGTH = 255;
+
+	public function resolve(FilterInterface $filter): string
+	{
+		$options = $this->parseOptions($filter->getOptions());
+		$name = '_' . $filter->getName() . ($options ? '-' . implode('-', $options) : '');
+		$length = strlen($name);
+
+		if ($length > self::MAX_LENGTH) {
+			throw new LogicException(
+				sprintf('Maximum length of directory must be equal or less than 255, %d given.', $length)
+			);
+		}
+
+		return $name;
+	}
+
+	/**
+	 * @param mixed[] $options
+	 * @return mixed[]
+	 */
+	private function parseOptions(array $options): array
+	{
+		$listKey = 0;
+		foreach ($options as $key => &$value) {
+			if ($key !== $listKey) {
+				throw new LogicException(
+					sprintf('%s only supports option list, given array.', self::class)
+				);
+			}
+
+			if (is_bool($value)) {
+				$value = (string) (int) $value;
+			} elseif (is_string($value)) {
+				if (!preg_match('#^[\w]+$#', $value)) {
+					throw new LogicException(
+						sprintf('%s only supports string contains a-z, A-Z and _', self::class)
+					);
+				}
+			} elseif (is_int($value)) {
+				$value = (string) $value;
+			} else {
+				throw new LogicException(
+					sprintf('%s only supports int, string or bool values.', self::class)
+				);
+			}
+
+			$listKey++;
+		}
+
+		return $options;
+	}
+
+}