using System.Text.RegularExpressions;

namespace Day13;

public partial class Parser
{
    [GeneratedRegex(@".*")]
    private partial Regex LineMatch();
    
    public IEnumerable<Image> Parse(string inputFile)
    {
        using var reader = File.OpenText(inputFile);

        var buffer = new List<string>();
        while (!reader.EndOfStream)
        {
            var line = reader.ReadLine()!;
            if (string.IsNullOrEmpty(line) && buffer.Count > 0)
            {
                yield return new Image(buffer);
                buffer = new List<string>();
            }
            else
            {
                buffer.Add(line);
            }
        }

        if (buffer.Count > 0)
        {
            yield return new Image(buffer);
        }
    }
}