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AspClassic.Scripting/SourceCodeReader.cs

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+using System;
+using System.IO;
+using System.Text;
+using AspClassic.Scripting.Utils;
+
+namespace AspClassic.Scripting;
+
+public class SourceCodeReader : TextReader
+{
+	public new static readonly SourceCodeReader Null = new SourceCodeReader(TextReader.Null, null);
+
+	private readonly TextReader _textReader;
+
+	private readonly Encoding _encoding;
+
+	public Encoding Encoding => _encoding;
+
+	public TextReader BaseReader => _textReader;
+
+	public SourceCodeReader(TextReader textReader, Encoding encoding)
+	{
+		ContractUtils.RequiresNotNull(textReader, "textReader");
+		_encoding = encoding;
+		_textReader = textReader;
+	}
+
+	public override string ReadLine()
+	{
+		return _textReader.ReadLine();
+	}
+
+	public virtual bool SeekLine(int line)
+	{
+		if (line < 1)
+		{
+			throw new ArgumentOutOfRangeException("line");
+		}
+		if (line == 1)
+		{
+			return true;
+		}
+		int num = 1;
+		while (true)
+		{
+			switch (_textReader.Read())
+			{
+			case 13:
+				if (_textReader.Peek() == 10)
+				{
+					_textReader.Read();
+				}
+				num++;
+				if (num == line)
+				{
+					return true;
+				}
+				break;
+			case 10:
+				num++;
+				if (num == line)
+				{
+					return true;
+				}
+				break;
+			case -1:
+				return false;
+			}
+		}
+	}
+
+	public override string ReadToEnd()
+	{
+		return _textReader.ReadToEnd();
+	}
+
+	public override int Read(char[] buffer, int index, int count)
+	{
+		return _textReader.Read(buffer, index, count);
+	}
+
+	public override int Peek()
+	{
+		return _textReader.Peek();
+	}
+
+	public override int Read()
+	{
+		return _textReader.Read();
+	}
+
+	protected override void Dispose(bool disposing)
+	{
+		_textReader.Dispose();
+	}
+}