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35 lines
768 B
35 lines
768 B
using System.Linq.Expressions;
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using System.Reflection;
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using ExpressionVisitor = Connected.Expressions.Visitors.ExpressionVisitor;
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namespace Connected.Expressions.Evaluation;
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public sealed class SubtreeResolver : ExpressionVisitor
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{
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private SubtreeResolver(Type type)
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{
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Type = type;
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}
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private Type Type { get; }
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private Expression Found { get; set; }
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public static Expression? Resolve(Expression expression, Type type)
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{
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var finder = new SubtreeResolver(type);
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finder.Visit(expression);
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return finder.Found;
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}
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protected override Expression? Visit(Expression? exp)
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{
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var node = base.Visit(exp);
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if (Found is null && node is not null && Type.GetTypeInfo().IsAssignableFrom(node.Type.GetTypeInfo()))
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Found = node;
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return node;
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}
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} |