ScopeExpression.cs

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using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Dynamic.Utils;
 
namespace System.Linq.Expressions;
 
internal class ScopeExpression : BlockExpression
{
    private IReadOnlyList<ParameterExpression> _variables;
 
    protected IReadOnlyList<ParameterExpression> VariablesList => _variables;
 
    internal ScopeExpression(IReadOnlyList<ParameterExpression> variables)
    {
        _variables = variables;
    }
 
    internal override bool SameVariables(ICollection<ParameterExpression> variables)
    {
        return ExpressionUtils.SameElements(variables, _variables);
    }
 
    internal override ReadOnlyCollection<ParameterExpression> GetOrMakeVariables()
    {
        return ExpressionUtils.ReturnReadOnly(ref _variables);
    }
 
    internal IReadOnlyList<ParameterExpression> ReuseOrValidateVariables(ReadOnlyCollection<ParameterExpression> variables)
    {
        if (variables != null && variables != VariablesList)
        {
            Expression.ValidateVariables(variables, "variables");
            return variables;
        }
        return VariablesList;
    }
}