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AspClassic.Scripting/SourceLocation.cs

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+using System;
+using System.Globalization;
+
+namespace AspClassic.Scripting;
+
+[Serializable]
+public struct SourceLocation
+{
+	private readonly int _index;
+
+	private readonly int _line;
+
+	private readonly int _column;
+
+	public static readonly SourceLocation None = new SourceLocation(0, 16707566, 0, noChecks: true);
+
+	public static readonly SourceLocation Invalid = new SourceLocation(0, 0, 0, noChecks: true);
+
+	public static readonly SourceLocation MinValue = new SourceLocation(0, 1, 1);
+
+	public int Index => _index;
+
+	public int Line => _line;
+
+	public int Column => _column;
+
+	public bool IsValid
+	{
+		get
+		{
+			if (_line != 0)
+			{
+				return _column != 0;
+			}
+			return false;
+		}
+	}
+
+	public SourceLocation(int index, int line, int column)
+	{
+		ValidateLocation(index, line, column);
+		_index = index;
+		_line = line;
+		_column = column;
+	}
+
+	private static void ValidateLocation(int index, int line, int column)
+	{
+		if (index < 0)
+		{
+			throw ErrorOutOfRange("index", 0);
+		}
+		if (line < 1)
+		{
+			throw ErrorOutOfRange("line", 1);
+		}
+		if (column < 1)
+		{
+			throw ErrorOutOfRange("column", 1);
+		}
+	}
+
+	private static Exception ErrorOutOfRange(object p0, object p1)
+	{
+		return new ArgumentOutOfRangeException($"{p0} must be greater than or equal to {p1}");
+	}
+
+	private SourceLocation(int index, int line, int column, bool noChecks)
+	{
+		_index = index;
+		_line = line;
+		_column = column;
+	}
+
+	public static bool operator ==(SourceLocation left, SourceLocation right)
+	{
+		if (left._index == right._index && left._line == right._line)
+		{
+			return left._column == right._column;
+		}
+		return false;
+	}
+
+	public static bool operator !=(SourceLocation left, SourceLocation right)
+	{
+		if (left._index == right._index && left._line == right._line)
+		{
+			return left._column != right._column;
+		}
+		return true;
+	}
+
+	public static bool operator <(SourceLocation left, SourceLocation right)
+	{
+		return left._index < right._index;
+	}
+
+	public static bool operator >(SourceLocation left, SourceLocation right)
+	{
+		return left._index > right._index;
+	}
+
+	public static bool operator <=(SourceLocation left, SourceLocation right)
+	{
+		return left._index <= right._index;
+	}
+
+	public static bool operator >=(SourceLocation left, SourceLocation right)
+	{
+		return left._index >= right._index;
+	}
+
+	public static int Compare(SourceLocation left, SourceLocation right)
+	{
+		if (left < right)
+		{
+			return -1;
+		}
+		if (right > left)
+		{
+			return 1;
+		}
+		return 0;
+	}
+
+	public override bool Equals(object obj)
+	{
+		if (!(obj is SourceLocation sourceLocation))
+		{
+			return false;
+		}
+		if (sourceLocation._index == _index && sourceLocation._line == _line)
+		{
+			return sourceLocation._column == _column;
+		}
+		return false;
+	}
+
+	public override int GetHashCode()
+	{
+		return (_line << 16) ^ _column;
+	}
+
+	public override string ToString()
+	{
+		return "(" + _line + "," + _column + ")";
+	}
+
+	internal string ToDebugString()
+	{
+		return string.Format(CultureInfo.CurrentCulture, "({0},{1},{2})", new object[3] { _index, _line, _column });
+	}
+}