/Microsoft.Scripting/Utils/DynamicUtils.cs

/* ****************************************************************************

 *

 * Copyright (c) Microsoft Corporation. 

 *

 * This source code is subject to terms and conditions of the Microsoft Public License. A 

 * copy of the license can be found in the License.html file at the root of this distribution. If 

 * you cannot locate the  Microsoft Public License, please send an email to 

 * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 

 * by the terms of the Microsoft Public License.

 *

 * You must not remove this notice, or any other, from this software.

 *

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 * ***************************************************************************/

using System; using Microsoft;





#if CODEPLEX_40

using System.Dynamic;

using System.Linq.Expressions;

#else

using Microsoft.Scripting;

using Microsoft.Linq.Expressions;

#endif



namespace Microsoft.Scripting.Utils {

    public static class DynamicUtils {

        /// <summary>

        /// Returns the list of expressions represented by the <see cref="DynamicMetaObject"/> instances.

        /// </summary>

        /// <param name="objects">An array of <see cref="DynamicMetaObject"/> instances to extract expressions from.</param>

        /// <returns>The array of expressions.</returns>

        public static Expression[] GetExpressions(DynamicMetaObject[] objects) {

            ContractUtils.RequiresNotNull(objects, "objects");



            Expression[] res = new Expression[objects.Length];

            for (int i = 0; i < objects.Length; i++) {

                DynamicMetaObject mo = objects[i];

                res[i] = mo != null ? mo.Expression : null;

            }



            return res;

        }



        /// <summary>

        /// Creates an instance of <see cref="DynamicMetaObject"/> for a runtime value and the expression that represents it during the binding process.

        /// </summary>

        /// <param name="argValue">The runtime value to be represented by the <see cref="DynamicMetaObject"/>.</param>

        /// <param name="parameterExpression">An expression to represent this <see cref="DynamicMetaObject"/> during the binding process.</param>

        /// <returns>The new instance of <see cref="DynamicMetaObject"/>.</returns>

        public static DynamicMetaObject ObjectToMetaObject(object argValue, Expression parameterExpression) {

            IDynamicMetaObjectProvider ido = argValue as IDynamicMetaObjectProvider;

            if (ido != null) {

                return ido.GetMetaObject(parameterExpression);

            } else {

                return new DynamicMetaObject(parameterExpression, BindingRestrictions.Empty, argValue);

            }

        }

    }

}