72 lines
3.0 KiB
C#
72 lines
3.0 KiB
C#
/*
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BSD 3-Clause License
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Copyright (c) 2017, B. Wofter
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace BWofter.Converters.Expressions
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{
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using System;
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using System.Linq.Expressions;
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public sealed class IsAssignableFromExpression : DataExpression
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{
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public override Type Type => boolType;
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public Expression TargetType { get; }
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public Expression OtherType { get; }
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internal IsAssignableFromExpression(Expression target, Expression other)
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{
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TargetType = target ?? throw new ArgumentNullException(nameof(target));
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OtherType = other ?? throw new ArgumentNullException(nameof(other));
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}
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public IsAssignableFromExpression Update(Expression target, Expression other) =>
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new IsAssignableFromExpression(target, other);
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public override Expression Reduce()
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{
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Expression target,
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other;
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if (typeType.IsAssignableFrom(TargetType.Type) || typeInfoType.IsAssignableFrom(TargetType.Type))
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{
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target = TargetType;
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}
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else
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{
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target = Call(TargetType, nameof(object.GetType), Type.EmptyTypes);
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}
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if (typeType.IsAssignableFrom(OtherType.Type) || typeInfoType.IsAssignableFrom(OtherType.Type))
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{
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other = OtherType;
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}
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else
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{
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other = Call(OtherType, nameof(object.GetType), Type.EmptyTypes);
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}
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return Call(TargetType, nameof(Type.IsAssignableFrom), Type.EmptyTypes, other);
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}
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}
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}
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