Added YandexYmlCurrency class.

composer.json

@@ -10,5 +10,7 @@
     "issues": "https://www.drupal.org/project/issues/yandex_yml",
     "source": "http://cgit.drupalcode.org/yandex_yml"
   },
-  "require": { }
+  "require": {
+    "php": ">=5.6"
+  }
 }

src/YandexYml/Currency/YandexYmlCurrency.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace Drupal\yandex_yml\YandexYml\Currency;
+
+/**
+ * Class YandexYmlCurrency.
+ *
+ * @see https://yandex.ru/support/webmaster/goods-prices/technical-requirements.html#concept3__currencies
+ */
+class YandexYmlCurrency {
+
+  /**
+   * Currency code available in YML file.
+   *
+   * @var string
+   *   Currency code name.
+   */
+  private $id;
+
+  /**
+   * Currency exchange rate for the unit.
+   *
+   * @var mixed
+   */
+  private $rate;
+
+  /**
+   * Currency code name.
+   *
+   * @example RUR, RUB, USD, EUR< UAH, KZT
+   *
+   * @param string $id
+   *
+   * @return YandexYmlCurrency
+   */
+  public function setId($id) {
+    $this->id = $id;
+    return $this;
+  }
+
+  /**
+   * @return int
+   */
+  public function getId() {
+    return $this->id;
+  }
+
+  /**
+   * Exchange rate will apply for currency with rate = 1. The values can be:
+   *  - int/bool: your exchange rate from store, f.e. 10, 23.98.
+   *  - CBRF: exchange rate from Central Bank of Russian Federation.
+   *  - NBU: exchange rate from National Bank of Ukraine.
+   *  - NBK: exchange rate from National Bank of Kazakhstan.
+   *  - СВ: exchange rate from bank which selected in Yandex interface.
+   *
+   * Only RUR, RUB, BYN, UAH and KZT can be set as default currency (rate = 1).
+   *
+   * @param mixed $rate
+   *
+   * @return YandexYmlCurrency
+   */
+  public function setRate($rate) {
+    $this->rate = $rate;
+    return $this;
+  }
+
+  /**
+   * @return mixed
+   */
+  public function getRate() {
+    return $this->rate;
+  }
+
+}

src/YandexYmlGenerator.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Drupal\yandex_yml;
+
+/**
+ * Class YandexYmlGenerator.
+ */
+class YandexYmlGenerator implements YandexYmlGeneratorInterface {
+
+  /**
+   * Constructs a new YandexYmlGenerator object.
+   */
+  public function __construct() {
+
+  }
+
+}

src/YandexYmlGeneratorInterface.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Drupal\yandex_yml;
+
+/**
+ * Interface YandexYmlGeneratorInterface.
+ */
+interface YandexYmlGeneratorInterface {
+
+
+}

yandex_yml.services.yml

@@ -0,0 +1,5 @@
+services:
+  yandex_yml.generator:
+    class: Drupal\yandex_yml\YandexYmlGenerator
+    arguments: []
+