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+<?php
+/*
+ * Copyright 2010-2012 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+
+/*%******************************************************************************************%*/
+// CLASS
+
+/**
+ * Contains utility methods used for converting array, JSON, and YAML data types into query string keys.
+ *
+ * @version 2010.11.11
+ * @license See the included NOTICE.md file for more information.
+ * @copyright See the included NOTICE.md file for more information.
+ * @link http://aws.amazon.com/php/ PHP Developer Center
+ */
+class CFComplexType
+{
+	/**
+	 * Takes a JSON object, as a string, to convert to query string keys.
+	 *
+	 * @param string $json (Required) A JSON object. The JSON string should use canonical rules (e.g., double quotes, quoted keys) as is required by PHP's <php:json_encode()> function.
+	 * @param string $member (Optional) The name of the "member" property that AWS uses for lists in certain services. Defaults to an empty string.
+	 * @param string $default_key (Optional) The default key to use when the value for `$data` is a string. Defaults to an empty string.
+	 * @return array The option group parameters to merge into another method's `$opt` parameter.
+	 */
+	public static function json($json, $member = '', $default_key = '')
+	{
+		return self::option_group(json_decode($json, true), $member, $default_key);
+	}
+
+	/**
+	 * Takes a YAML object, as a string, to convert to query string keys.
+	 *
+	 * @param string $yaml (Required) A YAML object.
+	 * @param string $member (Optional) The name of the "member" property that AWS uses for lists in certain services. Defaults to an empty string.
+	 * @param string $default_key (Optional) The default key to use when the value for `$data` is a string. Defaults to an empty string.
+	 * @return array The option group parameters to merge into another method's `$opt` parameter.
+	 */
+	public static function yaml($yaml, $member = '', $default_key = '')
+	{
+		return self::option_group(sfYaml::load($yaml), $member, $default_key);
+	}
+
+	/**
+	 * Takes an associative array to convert to query string keys.
+	 *
+	 * @param array $map (Required) An associative array.
+	 * @param string $member (Optional) The name of the "member" property that AWS uses for lists in certain services. Defaults to an empty string.
+	 * @param string $default_key (Optional) The default key to use when the value for `$data` is a string. Defaults to an empty string.
+	 * @return array The option group parameters to merge into another method's `$opt` parameter.
+	 */
+	public static function map($map, $member = '', $default_key = '')
+	{
+		return self::option_group($map, $member, $default_key);
+	}
+
+	/**
+	 * A protected method that is used by <json()>, <yaml()> and <map()>.
+	 *
+	 * @param string|array $data (Required) The data to iterate over.
+	 * @param string $member (Optional) The name of the "member" property that AWS uses for lists in certain services. Defaults to an empty string.
+	 * @param string $key (Optional) The default key to use when the value for `$data` is a string. Defaults to an empty string.
+	 * @param array $out (Optional) INTERNAL ONLY. The array that contains the calculated values up to this point.
+	 * @return array The option group parameters to merge into another method's `$opt` parameter.
+	 */
+	public static function option_group($data, $member = '', $key = '', &$out = array())
+	{
+		$reset = $key;
+
+		if (is_array($data))
+		{
+			foreach ($data as $k => $v)
+			{
+				// Avoid 0-based indexes.
+				if (is_int($k))
+				{
+					$k = $k + 1;
+
+					if ($member !== '')
+					{
+						$key .= '.' . $member;
+					}
+				}
+
+				$key .= ($key === '' ? $k : '.' . $k);
+
+				if (is_array($v))
+				{
+					self::option_group($v, $member, $key, $out);
+				}
+				elseif ($v instanceof CFStepConfig)
+				{
+					self::option_group($v->get_config(), $member, $key, $out);
+				}
+				else
+				{
+					$out[$key] = $v;
+				}
+
+				$key = $reset;
+			}
+		}
+		else
+		{
+			$out[$key] = $data;
+		}
+
+		return $out;
+	}
+}