gistfile1.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Globalization;

namespace formatter
{
	// supported codes: 
	//	\fb; \fr; -- font bold/regular.
	//	\al; \ar; -- align left/right
	//	\cRRGGBB; -- color
	//  \cz;	  -- reset to default color
	//	\n		  -- newline
	//  \t		  -- next tabstop
	//	\\;		  -- escaped slash

	public partial class Form1 : Form
	{
		public Form1()
		{
			InitializeComponent();
			textBox1.Text = @"\fb;Tesla Coil (\cffff00;J\cz;)\ar;$1200\n;\fr;\al;\cff0000;Requires War Factory\cz;\ar;\fb;-150\n;\fr;\al;A hax weapon. Chews up tanks. A really insanely long LongDesc so Alzeih can see that wordwrap works, although color- and hyphenation-unaware typography really does nothing for me.\n;\t;Strong vs \fb;\c00cc00;Infantry, Vehicles\cz;\fr;\n;\t;Weak vs \fb;\ccc0000;Aircraft\cz;\fr;";
		}

		static IEnumerable<string> Tokens(string s)
		{
			var i = 0;
			var inOpcode = false;

			for( var j = 0; j < s.Length; j++ )
				if (!inOpcode) { if (s[j] == '\\') { yield return s.Substring(i, j - i); i = j; inOpcode = true; } }
				else { if (s[j] == ';') { yield return s.Substring(i, j - i + 1); i = j + 1; inOpcode = false; } }

			if (i < s.Length) yield return s.Substring(i);
		}

		string fmt = "";

		void UpdateRendering(object sender, EventArgs e)
		{
			fmt = textBox1.Text;
			panel1.Invalidate();
		}

		Brush ReplaceBrush(Brush old, Color c)
		{
			old.Dispose();
			return new SolidBrush(c);
		}

		int ParseHex(string s, int start, int length)
		{
			var t = s.Substring(start, length);
			return int.Parse(t, NumberStyles.HexNumber);
		}

		const int tabWidth = 20;
		const int layoutWidth = 250;
		const int leftEdge = 20;

		void PaintPanel(object sender, PaintEventArgs e)
		{
			var rf = panel1.Font; 
			var bf = new Font(rf, FontStyle.Bold); 
			var f = rf;
			var b = new SolidBrush(Color.White) as Brush;
			var y = 20;
			var x = (float)leftEdge;
			var rightAlign = false;

			foreach (var t in Tokens(fmt.Replace("\r\n", "")))
			{
				if (t == @"\fb;") f = bf;
				else if (t == @"\fr;") f = rf;
				else if (t == @"\n;") { y += f.Height; x = rightAlign ? layoutWidth : leftEdge; }
				else if (t == @"\cz;") { b = ReplaceBrush(b, Color.White); }
				else if (t == @"\al;") { rightAlign = false; x = leftEdge; }
				else if (t == @"\ar;") { rightAlign = true; x = layoutWidth; }
				else if (t.StartsWith(@"\c")) { b = ReplaceBrush(b, Color.FromArgb(ParseHex(t, 2, 2), ParseHex(t, 4, 2), ParseHex(t, 6, 2))); }
				else if (t == @"\t;") { x += tabWidth; x -= (int)(x-leftEdge) % tabWidth; }
				else
				{
					var s = (t == @"\\;") ? @"\" : t;
					var w = e.Graphics.MeasureString(t, f);
					if (rightAlign)
					{
						e.Graphics.DrawString(t, f, b, x - w.Width, y);
						x -= w.Width;
					}
					else
					{
						if (w.Width + x > layoutWidth)
						{
							// do wrapping

							var spaceWidth = e.Graphics.MeasureString("._.", f).Width - e.Graphics.MeasureString("__",f).Width;

							var words = t.Split(' ');
							foreach (var ww in words)
							{
								var width = e.Graphics.MeasureString(ww, f);
								if (x + width.Width < layoutWidth)
								{
									e.Graphics.DrawString(ww, f, b, x, y);
									x += width.Width + spaceWidth;
								}
								else
								{
									x = leftEdge;
									y += f.Height;
									e.Graphics.DrawString(ww, f, b, x, y);
									x += width.Width + spaceWidth;
								}
							}
						}
						else
						{
							e.Graphics.DrawString(t, f, b, x, y);
							x += w.Width;
						}
					}
				}
			}
		}
	}
}