BrcWriter.cs

#nullable enable
using System.Text;
using static Brc.BrcGlobal;

namespace Brc
{
	public class BrcWriter
	{
		private readonly StringBuilder sb = new();
		private readonly Brc brc;
		private BrcSentence pre;
		private BrcWriter(Brc brc) => this.brc = brc;
		private void Write(BrcSentence sentence)
		{
			if (sentence.lines?.Length > 0) { sb.AppendLine(); }
			int notEqual = BrcSentence.PropertyEquals(pre, sentence);
			if (notEqual >= 0)
			{
				sb.Append(_leftbucket);
				sb.Append(sentence.BeatsPerBar);
				if (notEqual >= 1)
				{
					sb.Append(_comma);
					sb.Append(sentence.NotePerBeat);
					if (notEqual >= 2)
					{
						sb.Append(_comma);
						sb.Append(sentence.BeatsPerMinute.ToString("F2"));
						if (notEqual >= 3)
						{
							sb.Append(_comma);
							sb.Append(sentence.Offset);
						}
					}
				}
				sb.Append(_rightbucket);
			}
			pre = sentence;
			for (int lineIndex = 0; lineIndex < sentence.lines!.Length; lineIndex++)
			{
				var line = sentence.lines[lineIndex];
				float totalLength = 0;
				for (int wordIndex = 0; wordIndex < line.words.Length; wordIndex++)
				{
					var word = line.words[wordIndex];
					WriteWord(word, wordIndex, line.words.Length);
					totalLength += word.Duration;
					if (totalLength >= pre.BeatsPerBar && wordIndex < line.words.Length - 1)
					{
						sb.AppendLine();
						totalLength -= pre.BeatsPerBar;
					}
				}
				if (lineIndex < sentence.lines.Length - 1)
					sb.Append(_newLine);
			}
			sb.Append(_sentence);
		}
		private void WriteWord(BrcWord word, int index, int all)
		{
			foreach (char c in word.Word)
			{
				if (c is _escape or _separator or _sentence or _leftbucket or _rightbucket or _connect or _newLine)
					sb.Append(_escape);
				sb.Append(c);
			}
			if (word.Duration * pre.NotePerBeat > 1)
				for (int j = 0; j < word.Duration * pre.NotePerBeat - 1; j++)
					sb.Append(_connect);
			else if (index < all - 1)
				sb.Append(_separator);
		}
		private void Write(string filepath)
		{
			foreach (BrcSentence sentence in brc)
				Write(sentence);
			System.IO.File.WriteAllText(filepath, sb.ToString());
		}
		public static void Write(string filepath, Brc brc)
		{
			new BrcWriter(brc).Write(filepath);
		}
	}
}