ScopeN.cs

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using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Dynamic.Utils;
 
namespace System.Linq.Expressions;
 
internal class ScopeN : ScopeExpression
{
    private IReadOnlyList<Expression> _body;
 
    protected IReadOnlyList<Expression> Body => _body;
 
    internal override int ExpressionCount => _body.Count;
 
    internal ScopeN(IReadOnlyList<ParameterExpression> variables, IReadOnlyList<Expression> body)
        : base(variables)
    {
        _body = body;
    }
 
    internal override bool SameExpressions(ICollection<Expression> expressions)
    {
        return ExpressionUtils.SameElements(expressions, _body);
    }
 
    internal override Expression GetExpression(int index)
    {
        return _body[index];
    }
 
    internal override ReadOnlyCollection<Expression> GetOrMakeExpressions()
    {
        return ExpressionUtils.ReturnReadOnly(ref _body);
    }
 
    internal override BlockExpression Rewrite(ReadOnlyCollection<ParameterExpression> variables, Expression[] args)
    {
        if (args == null)
        {
            Expression.ValidateVariables(variables, "variables");
            return new ScopeN(variables, _body);
        }
        return new ScopeN(ReuseOrValidateVariables(variables), args);
    }
}