Add regional language support (#23)

src/Language/AbstractLanguage.php

@@ -0,0 +1,6 @@
+<?php
+namespace Packaged\Rwd\Language;
+
+abstract class AbstractLanguage implements LanguageInterface
+{
+}

src/Language/AbstractRegionalLanguage.php

@@ -0,0 +1,13 @@
+<?php
+namespace Packaged\Rwd\Language;
+
+abstract class AbstractRegionalLanguage extends AbstractLanguage implements RegionalLanguageInterface
+{
+  /**
+   * @return string
+   */
+  public function getFullCode()
+  {
+    return $this->getCode() . '-' . $this->getRegionCode();
+  }
+}

src/Language/RegionalLanguage.php

@@ -0,0 +1,39 @@
+<?php
+namespace Packaged\Rwd\Language;
+
+class RegionalLanguage extends AbstractRegionalLanguage implements RegionalLanguageInterface
+{
+  protected $_language;
+  protected $_regionCode;
+
+  public function __construct(LanguageInterface $baseLanguage, string $regionCode)
+  {
+    $this->_language = $baseLanguage;
+    $this->_regionCode = $regionCode;
+  }
+
+  public function getEnglishName()
+  {
+    return $this->_language->getEnglishName();
+  }
+
+  public function getNativeName()
+  {
+    return $this->_language->getNativeName();
+  }
+
+  public function getCode()
+  {
+    return $this->_language->getCode();
+  }
+
+  public function getDirection()
+  {
+    return $this->_language->getDirection();
+  }
+
+  public function getRegionCode()
+  {
+    return $this->_regionCode;
+  }
+}

src/Language/RegionalLanguageInterface.php

@@ -0,0 +1,15 @@
+<?php
+namespace Packaged\Rwd\Language;
+
+interface RegionalLanguageInterface extends LanguageInterface
+{
+  /**
+   * @return string
+   */
+  public function getRegionCode();
+
+  /**
+   * @return string
+   */
+  public function getFullCode();
+}