Upsilon/Upsilon/Text/TextSpan.cs

namespace Upsilon.Text
{
    public struct TextSpan
    {
        public int StartLine { get; }
        public int StartPosition { get; }
        public int EndLine { get; }
        public int EndPosition { get; }

        public TextSpan(int startLine, int startPosition, int endLine, int endPosition)
        {
            StartLine = startLine;
            StartPosition = startPosition;
            EndLine = endLine;
            EndPosition = endPosition;
        }

        public override string ToString()
        {
            return $"({StartLine}, {StartPosition}) - ({EndLine}, {EndPosition})";
        }

        public static TextSpan Between(TextSpan start, TextSpan end)
        {
            return new TextSpan(start.StartLine, start.StartPosition, end.EndLine, end.EndPosition);
        }

        public bool Contains(int linePosition, int characterPosition)
        {
            if (StartLine == EndLine && linePosition == StartLine)
            {
                return characterPosition >= StartPosition && characterPosition <= EndPosition;
            }
            if (StartLine == linePosition && StartPosition <= characterPosition) return true;
            if (StartLine < linePosition && EndLine > linePosition) return true;
            if (EndLine == linePosition && EndPosition >= characterPosition) return true;
            return false;
        }
    }
}