Canon/Canon.Core/SyntaxNodes/NonTerminatedSyntaxNode.cs

using System.Collections;
using Canon.Core.Enums;

namespace Canon.Core.SyntaxNodes;

public abstract class NonTerminatedSyntaxNode : SyntaxNodeBase, IEnumerable<SyntaxNodeBase>
{
    public override bool IsTerminated => false;

    public abstract NonTerminatorType Type { get; }

    public required List<SyntaxNodeBase> Children { get; init; }

    public IEnumerator<SyntaxNodeBase> GetEnumerator()
    {
        yield return this;

        foreach (SyntaxNodeBase child in Children)
        {
            if (child.IsTerminated)
            {
                yield return child;
            }
            else
            {
                NonTerminatedSyntaxNode nonTerminatedNode = child.Convert<NonTerminatedSyntaxNode>();

                foreach (SyntaxNodeBase node in nonTerminatedNode)
                {
                    yield return node;
                }
            }
        }
    }

    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();

    public override string ToString()
    {
        return Type.ToString();
    }
}