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/* ****************************************************************************
*
* 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.
*
*
* ***************************************************************************/
using System.Collections.Generic;
using System.Linq.Expressions;
namespace Microsoft.Scripting.Ast {
internal sealed class LambdaParameterRewriter : ExpressionVisitor {
private readonly Dictionary<ParameterExpression, ParameterExpression> _map;
internal LambdaParameterRewriter(Dictionary<ParameterExpression, ParameterExpression> map) {
_map = map;
}
// We don't need to worry about parameter shadowing, because we're
// replacing the instances consistently everywhere
protected override Expression VisitParameter(ParameterExpression node) {
ParameterExpression result;
if (_map.TryGetValue(node, out result)) {
return result;
}
return node;
}
}
}
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