From 32e4e9dff87c7119a0933884df5b6a1b94d80998 Mon Sep 17 00:00:00 2001
From: tznind <tznind@dundee.ac.uk>
Date: Sun, 13 Jun 2021 09:33:57 +0100
Subject: [PATCH] Added word splitting

---
 UICatalog/Scenarios/SyntaxHighlighting.cs | 66 ++++++++++++++++++++++-
 1 file changed, 64 insertions(+), 2 deletions(-)

diff --git a/UICatalog/Scenarios/SyntaxHighlighting.cs b/UICatalog/Scenarios/SyntaxHighlighting.cs
index 98234beca..2aaec9215 100644
--- a/UICatalog/Scenarios/SyntaxHighlighting.cs
+++ b/UICatalog/Scenarios/SyntaxHighlighting.cs
@@ -4,10 +4,11 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
+using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using Terminal.Gui;
 using static UICatalog.Scenario;
-
+using Attribute = Terminal.Gui.Attribute;
 
 namespace UICatalog.Scenarios {
 	[ScenarioMetadata (Name: "Syntax Highlighting", Description: "Text editor with keyword highlighting")]
@@ -35,7 +36,10 @@ namespace UICatalog.Scenarios {
 					Height = Dim.Fill (1),
 				};
 
+				textView.Init();
 
+				textView.Text = "SELECT TOP 100 * \nfrom\n MyDb.dbo.Biochemistry;";
+				
 				Win.Add (textView);
 
 				var statusBar = new StatusBar (new StatusItem [] {
@@ -55,11 +59,69 @@ namespace UICatalog.Scenarios {
 
 		private class SqlTextView : TextView{
 
+			private HashSet<string> keywords = new HashSet<string>(StringComparer.CurrentCultureIgnoreCase);
+			private Attribute blue;
+			private Attribute white;
 
 
+			public void Init()
+			{
+				keywords.Add("select");
+				keywords.Add("distinct");
+				keywords.Add("top");
+				keywords.Add("from");
+
+				blue = Driver.MakeAttribute (Color.Cyan, Color.Black);
+				white = Driver.MakeAttribute (Color.White, Color.Black);
+			}
+
+			protected override void ColorNormal ()
+			{
+				Driver.SetAttribute (white);
+			}
+
 			protected override void ColorNormal (List<System.Rune> line, int idx)
 			{
-				Driver.SetAttribute (Driver.MakeAttribute (Color.Green, Color.Black));				
+				if(IsKeyword(line,idx))
+				{
+					Driver.SetAttribute (blue);
+				}
+				else{
+					Driver.SetAttribute (white);
+				}
+			}
+
+			private bool IsKeyword(List<System.Rune> line, int idx)
+			{
+				var word = IdxToWord(line,idx);
+				
+				if(string.IsNullOrWhiteSpace(word)){
+					return false;
+				}
+
+				return keywords.Contains(word,StringComparer.CurrentCultureIgnoreCase);
+			}
+
+			private string IdxToWord(List<System.Rune> line, int idx)
+			{
+				var words = Regex.Split(
+					new string(line.Select(r=>(char)r).ToArray()),
+					"\b");
+
+
+				int count = 0;
+				string current = null;
+
+				foreach(var word in words)
+				{
+					current = word;
+					count+= word.Length;
+					if(count >= idx){
+						break;
+					}
+				}
+
+				return current;
 			}
 		}
 	}