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alielie

2026-09-10 f3889f2d36c50cf99468594854def9b7ed069fb5

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using System;
using System.Linq.Expressions;
using DynamicExpresso.Parsing;
using DynamicExpresso.Reflection;
 
namespace DynamicExpresso.Resolution
{
    internal static class ExpressionUtils
    {
        public static Expression PromoteExpression(Expression expr, Type type)
        {
            if (expr.Type == type)
                return expr;
 
            if (expr is ConstantExpression ce && ce == ParserConstants.NullLiteralExpression)
            {
                if (type.ContainsGenericParameters)
                    return null;
                if (!type.IsValueType || TypeUtils.IsNullableType(type))
                    return Expression.Constant(null, type);
            }
 
            if (expr is InterpreterExpression ie)
            {
                if (!ie.IsCompatibleWithDelegate(type))
                    return null;
 
                if (!type.ContainsGenericParameters)
                    return ie.EvalAs(type);
 
                return expr;
            }
 
            if (type.IsAssignableFrom(expr.Type))
            {
                return Expression.Convert(expr, type);
            }
 
            if (type.IsGenericType && !TypeUtils.IsNumericType(type))
            {
                var genericType = TypeUtils.FindAssignableGenericType(expr.Type, type);
                if (genericType != null)
                    return Expression.Convert(expr, genericType);
            }
 
            if (TypeUtils.IsCompatibleWith(expr.Type, type))
            {
                return Expression.Convert(expr, type);
            }
 
            return null;
        }
    }
}