Add EnumType #19 (#20)

* Add EnumType #19
* Remove unsupported hhvm; Add php7.2; Update Readme.md

Author: TuningYourCode

.travis.yml

@@ -4,9 +4,9 @@ language: php
 matrix:
   include:
     - php: 5.6
-    - php: hhvm
     - php: 7.0
     - php: 7.1
+    - php: 7.2
     - php: nightly
   allow_failures:
     - php: nightly

README.md

@@ -84,6 +84,7 @@ Currently the following types are supported:
  * Datetime
  * Regex
  * Optional
+ * Enum
 
 There are some open issues with ideas for more types. Feel free to send pull requests.
 

spec/Type/EnumTypeSpec.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace spec\StructureCheck\Type;
+
+use StructureCheck\Type\EnumType;
+use PhpSpec\ObjectBehavior;
+
+class EnumTypeSpec extends ObjectBehavior
+{
+    function it_is_initializable()
+    {
+        $this->beConstructedWith(['test', 1, null]);
+
+        $this->shouldHaveType(EnumType::class);
+    }
+
+    function it_is_valid_for_all_allowed_values()
+    {
+        $this->beConstructedWith(['test', 1, null]);
+
+        $this->check('test')->isValid()->shouldBe(true);
+        $this->check(1)->isValid()->shouldBe(true);
+        $this->check(null)->isValid()->shouldBe(true);
+    }
+
+    function it_is_invalid_for_not_allowed_values()
+    {
+        $this->beConstructedWith(['test', 1, null]);
+        
+        $this->check('array')->isValid()->shouldBe(false);
+        $this->check(100)->isValid()->shouldBe(false);
+        $this->check(1.5)->isValid()->shouldBe(false);
+        $this->check(['test'])->isValid()->shouldBe(false);
+    }
+}

src/Type/DatetimeType.php

@@ -11,7 +11,7 @@
  * Class DatetimeType
  * @package StructureCheck\Type
  */
-class DatetimeType
+class DatetimeType implements TypeInterface
 {
     /**
      * @var string

src/Type/EnumType.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace StructureCheck\Type;
+
+use StructureCheck\Result;
+use StructureCheck\ResultInterface;
+
+class EnumType implements TypeInterface
+{
+    /**
+     * @var array
+     */
+    private $values = [];
+
+    /**
+     * @var string
+     */
+    private static $errorMessage = 'The value %s is not in the allowed values (%s).';
+
+    /**
+     * EnumType constructor.
+     *
+     * @param array $values
+     */
+    public function __construct(array $values)
+    {
+        $this->values = $values;
+    }
+
+    /**
+     * @param mixed $value
+     *
+     * @return ResultInterface
+     */
+    public function check($value)
+    {
+        $checkResult = in_array($value, $this->values, true);
+
+        return new Result(
+            $checkResult,
+            !$checkResult ? [sprintf(self::$errorMessage, json_encode($value), implode(',', $this->values))] : []
+        );
+    }
+}

src/Type/ExactValueType.php

@@ -5,7 +5,7 @@
 use StructureCheck\Result;
 use StructureCheck\ResultInterface;
 
-class ExactValueType
+class ExactValueType implements TypeInterface
 {
 
     /**

src/Type/NumericType.php

@@ -5,7 +5,7 @@
 use StructureCheck\Result;
 use StructureCheck\ResultInterface;
 
-class NumericType
+class NumericType implements TypeInterface
 {
     private static $errorMessage = 'The value %s is not a numeric value.';
 

src/Type/RegexType.php

@@ -9,7 +9,7 @@
  * Class RegexType
  * @package StructureCheck\Type
  */
-class RegexType
+class RegexType implements TypeInterface
 {
     /**
      * @var string