C# and VB.NET Code Searcher - Using Roslyn

using System.Drawing;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Xml;
using System.IO;
using System;

namespace FastColoredTextBoxNS
{
    public class SyntaxHighlighter: IDisposable
    {
        //styles
        public readonly Style BlueStyle = new TextStyle(Brushes.Blue, null, FontStyle.Regular);
        public readonly Style BlueBoldStyle = new TextStyle(Brushes.Blue, null, FontStyle.Bold);
        public readonly Style BoldStyle = new TextStyle(null, null, FontStyle.Bold | FontStyle.Underline);
        public readonly Style GrayStyle = new TextStyle(Brushes.Gray, null, FontStyle.Regular);
        public readonly Style MagentaStyle = new TextStyle(Brushes.Magenta, null, FontStyle.Regular);
        public readonly Style GreenStyle = new TextStyle(Brushes.Green, null, FontStyle.Italic);
        public readonly Style BrownStyle = new TextStyle(Brushes.Brown, null, FontStyle.Italic);
        public readonly Style RedStyle = new TextStyle(Brushes.Red, null, FontStyle.Regular);
        public readonly Style MaroonStyle = new TextStyle(Brushes.Maroon, null, FontStyle.Regular);
        //
        Dictionary<string, SyntaxDescriptor> descByXMLfileNames = new Dictionary<string, SyntaxDescriptor>();
        static readonly Platform platformType = PlatformType.GetOperationSystemPlatform();

        public static RegexOptions RegexCompiledOption
        {
            get {
                if (platformType == Platform.X86)
                    return RegexOptions.Compiled;
                else
                    return RegexOptions.None;
            }
        }

        /// <summary>
        /// Highlights syntax for given language
        /// </summary>
        public virtual void HighlightSyntax(Language language, Range range)
        {
            switch (language)
            {
                case Language.CSharp: CSharpSyntaxHighlight(range); break;
                case Language.VB: VBSyntaxHighlight(range); break;
                case Language.HTML: HTMLSyntaxHighlight(range); break;
                case Language.SQL: SQLSyntaxHighlight(range); break;
                case Language.PHP: PHPSyntaxHighlight(range); break;
                case Language.JS: JScriptSyntaxHighlight(range); break;
                default:
                    break;
            }
        }

        /// <summary>
        /// Highlights syntax for given XML description file
        /// </summary>
        public virtual void HighlightSyntax(string XMLdescriptionFile, Range range)
        {
            SyntaxDescriptor desc = null;
            if (!descByXMLfileNames.TryGetValue(XMLdescriptionFile, out desc))
            {
                var doc = new XmlDocument();
                string file = XMLdescriptionFile;
                if (!File.Exists(file))
                    file = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, Path.GetFileName(file));

                doc.LoadXml(File.ReadAllText(file));
                desc = ParseXmlDescription(doc);
                descByXMLfileNames[XMLdescriptionFile] = desc;
            }
            HighlightSyntax(desc, range);
        }

        public virtual void AutoIndentNeeded(object sender, AutoIndentEventArgs args)
        {
            FastColoredTextBox tb = (sender as FastColoredTextBox);
            Language language = tb.Language;
            switch (language)
            {
                case Language.CSharp: CSharpAutoIndentNeeded(sender, args); break;
                case Language.VB: VBAutoIndentNeeded(sender, args); break;
                case Language.HTML: HTMLAutoIndentNeeded(sender, args); break;
                case Language.SQL: SQLAutoIndentNeeded(sender, args); break;
                case Language.PHP: PHPAutoIndentNeeded(sender, args); break;
                case Language.JS: CSharpAutoIndentNeeded(sender, args); break;//JS like C#
                default:
                    break;
            }
        }

        private void PHPAutoIndentNeeded(object sender, AutoIndentEventArgs args)
        {
            /*
            FastColoredTextBox tb = sender as FastColoredTextBox;
            tb.CalcAutoIndentShiftByCodeFolding(sender, args);*/
            //block {}
            if (Regex.IsMatch(args.LineText, @"^[^""']*\{.*\}[^""']*$"))
                return;
            //start of block {}
            if (Regex.IsMatch(args.LineText, @"^[^""']*\{"))
            {
                args.ShiftNextLines = args.TabLength;
                return;
            }
            //end of block {}
            if (Regex.IsMatch(args.LineText, @"}[^""']*$"))
            {
                args.Shift = -args.TabLength;
                args.ShiftNextLines = -args.TabLength;
                return;
            }
            //is unclosed operator in previous line ?
            if (Regex.IsMatch(args.PrevLineText, @"^\s*(if|for|foreach|while|[\}\s]*else)\b[^{]*$"))
                if (!Regex.IsMatch(args.PrevLineText, @"(;\s*$)|(;\s*//)"))//operator is unclosed
                {
                    args.Shift = args.TabLength;
                    return;
                } 
        }

        private void SQLAutoIndentNeeded(object sender, AutoIndentEventArgs args)
        {
            FastColoredTextBox tb = sender as FastColoredTextBox;
            tb.CalcAutoIndentShiftByCodeFolding(sender, args);
        }

        private void HTMLAutoIndentNeeded(object sender, AutoIndentEventArgs args)
        {
            FastColoredTextBox tb = sender as FastColoredTextBox;
            tb.CalcAutoIndentShiftByCodeFolding(sender, args);
        }

        private void VBAutoIndentNeeded(object sender, AutoIndentEventArgs args)
        {
            //end of block
            if (Regex.IsMatch(args.LineText, @"^\s*(End|EndIf|Next|Loop)\b", RegexOptions.IgnoreCase))
            {
                args.Shift = -args.TabLength;
                args.ShiftNextLines = -args.TabLength;
                return;
            }
            //start of declaration
            if (Regex.IsMatch(args.LineText, @"\b(Class|Property|Enum|Structure|Sub|Function|Namespace|Interface|Get|Set)\b", RegexOptions.IgnoreCase))
            {
                args.ShiftNextLines = args.TabLength;
                return;
            }
            // then ...
            if (Regex.IsMatch(args.LineText, @"\b(Then)\s*\S+", RegexOptions.IgnoreCase))
                return;
            //start of operator block
            if (Regex.IsMatch(args.LineText, @"^\s*(If|While|For|Do|Try|With|Using|Select)\b", RegexOptions.IgnoreCase))
            {
                args.ShiftNextLines = args.TabLength;
                return;
            }

            //Statements else, elseif, case etc
            if (Regex.IsMatch(args.LineText, @"^\s*(Else|ElseIf|Case|Catch|Finally)\b", RegexOptions.IgnoreCase))
            {
                args.Shift = -args.TabLength;
                return;
            }

            //Char _
            if (args.PrevLineText.TrimEnd().EndsWith("_"))
            {
                args.Shift = args.TabLength;
                return;
            }
        }

        private void CSharpAutoIndentNeeded(object sender, AutoIndentEventArgs args)
        {
            //block {}
            if (Regex.IsMatch(args.LineText, @"^[^""']*\{.*\}[^""']*$"))
                return;
            //start of block {}
            if (Regex.IsMatch(args.LineText, @"^[^""']*\{"))
            {
                args.ShiftNextLines = args.TabLength;
                return;
            }
            //end of block {}
            if (Regex.IsMatch(args.LineText, @"}[^""']*$"))
            {
                args.Shift = -args.TabLength;
                args.ShiftNextLines = -args.TabLength;
                return;
            }
            //label
            if (Regex.IsMatch(args.LineText, @"^\s*\w+\s*:\s*($|//)") &&
                !Regex.IsMatch(args.LineText, @"^\s*default\s*:"))
            {
                args.Shift = -args.TabLength;
                return;
            }
            //some statements: case, default
            if (Regex.IsMatch(args.LineText, @"^\s*(case|default)\b.*:\s*($|//)"))
            {
                args.Shift = -args.TabLength/2;
                return;
            }
            //is unclosed operator in previous line ?
            if (Regex.IsMatch(args.PrevLineText, @"^\s*(if|for|foreach|while|[\}\s]*else)\b[^{]*$"))
            if (!Regex.IsMatch(args.PrevLineText, @"(;\s*$)|(;\s*//)"))//operator is unclosed
            {
                args.Shift = args.TabLength;
                return;
            }            
        }

        public static SyntaxDescriptor ParseXmlDescription(XmlDocument doc)
        {
            SyntaxDescriptor desc = new SyntaxDescriptor();
            XmlNode brackets = doc.SelectSingleNode("doc/brackets");
            if (brackets != null)
            {
                if (brackets.Attributes["left"] == null || brackets.Attributes["right"] == null ||
                    brackets.Attributes["left"].Value == "" || brackets.Attributes["right"].Value == "")
                {
                    desc.leftBracket = '\x0';
                    desc.rightBracket = '\x0';
                }
                else
                {
                    desc.leftBracket = brackets.Attributes["left"].Value[0];
                    desc.rightBracket = brackets.Attributes["right"].Value[0];
                }

                if (brackets.Attributes["left2"] == null || brackets.Attributes["right2"] == null ||
    brackets.Attributes["left2"].Value == "" || brackets.Attributes["right2"].Value == "")
                {
                    desc.leftBracket2 = '\x0';
                    desc.rightBracket2 = '\x0';
                }
                else
                {
                    desc.leftBracket2 = brackets.Attributes["left2"].Value[0];
                    desc.rightBracket2 = brackets.Attributes["right2"].Value[0];
                }
            }

            Dictionary<string, Style> styleByName = new Dictionary<string, Style>();

            foreach (XmlNode style in doc.SelectNodes("doc/style"))
            {
                var s = ParseStyle(style);
                styleByName[style.Attributes["name"].Value] = s;
                desc.styles.Add(s);
            }
            foreach (XmlNode rule in doc.SelectNodes("doc/rule"))
                desc.rules.Add(ParseRule(rule, styleByName));
            foreach (XmlNode folding in doc.SelectNodes("doc/folding"))
                desc.foldings.Add(ParseFolding(folding));

            return desc;
        }

        private static FoldingDesc ParseFolding(XmlNode foldingNode)
        {
            FoldingDesc folding = new FoldingDesc();
            //regex
            folding.startMarkerRegex = foldingNode.Attributes["start"].Value;
            folding.finishMarkerRegex = foldingNode.Attributes["finish"].Value;
            //options
            var optionsA = foldingNode.Attributes["options"];
            if (optionsA != null)
                folding.options = (RegexOptions)Enum.Parse(typeof(RegexOptions), optionsA.Value);

            return folding;
        }

        private static RuleDesc ParseRule(XmlNode ruleNode, Dictionary<string, Style> styles)
        {
            RuleDesc rule = new RuleDesc();
            rule.pattern = ruleNode.InnerText;
            //
            var styleA = ruleNode.Attributes["style"];
            var optionsA = ruleNode.Attributes["options"];
            //Style
            if (styleA == null)
                throw new Exception("Rule must contain style name.");
            if(!styles.ContainsKey(styleA.Value))
                throw new Exception("Style '"+styleA.Value+"' is not found.");
            rule.style = styles[styleA.Value];
            //options
            if (optionsA != null)
                rule.options = (RegexOptions)Enum.Parse(typeof(RegexOptions), optionsA.Value);

            return rule;
        }

        private static Style ParseStyle(XmlNode styleNode)
        {
            var typeA = styleNode.Attributes["type"];
            var colorA = styleNode.Attributes["color"];
            var backColorA = styleNode.Attributes["backColor"];
            var fontStyleA = styleNode.Attributes["fontStyle"];
            var nameA = styleNode.Attributes["name"];
            //colors
            SolidBrush foreBrush = null;
            if (colorA != null)
                foreBrush = new SolidBrush(ParseColor(colorA.Value));
            SolidBrush backBrush = null;
            if (backColorA != null)
                backBrush = new SolidBrush(ParseColor(backColorA.Value));
            //fontStyle
            FontStyle fontStyle = FontStyle.Regular;
            if (fontStyleA != null)
                fontStyle = (FontStyle)Enum.Parse(typeof(FontStyle), fontStyleA.Value);

            return new TextStyle(foreBrush, backBrush, fontStyle);
        }

        private static Color ParseColor(string s)
        {
            if (s.StartsWith("#"))
            {
                if(s.Length<=7)
                    return Color.FromArgb(255, Color.FromArgb(Int32.Parse(s.Substring(1), System.Globalization.NumberStyles.AllowHexSpecifier)));
                else
                    return Color.FromArgb(Int32.Parse(s.Substring(1), System.Globalization.NumberStyles.AllowHexSpecifier));
            }
            else
                return Color.FromName(s);
        }

        public void HighlightSyntax(SyntaxDescriptor desc, Range range)
        {
            //set style order
            range.tb.ClearStylesBuffer();
            for(int i=0;i<desc.styles.Count;i++)
                range.tb.Styles[i] = desc.styles[i];
            //brackets
            range.tb.LeftBracket = desc.leftBracket;
            range.tb.RightBracket = desc.rightBracket;
            range.tb.LeftBracket2 = desc.leftBracket2;
            range.tb.RightBracket2 = desc.rightBracket2;
            //clear styles of range
            range.ClearStyle(desc.styles.ToArray());
            //highlight syntax
            foreach (var rule in desc.rules)
                range.SetStyle(rule.style, rule.Regex);
            //clear folding
            range.ClearFoldingMarkers();
            //folding markers
            foreach (var folding in desc.foldings)
                range.SetFoldingMarkers(folding.startMarkerRegex, folding.finishMarkerRegex, folding.options);
        }

        Regex CSharpStringRegex, CSharpCommentRegex1, CSharpCommentRegex2, CSharpCommentRegex3, CSharpNumberRegex, CSharpAttributeRegex, CSharpClassNameRegex, CSharpKeywordRegex;

        void InitCShaprRegex()
        {
            CSharpStringRegex = new Regex( @"""""|@""""|''|@"".*?""|(?<!@)(?<range>"".*?[^\\]"")|'.*?[^\\]'", RegexCompiledOption);
            CSharpCommentRegex1 = new Regex(@"//.*$", RegexOptions.Multiline | RegexCompiledOption);
            CSharpCommentRegex2 = new Regex(@"(/\*.*?\*/)|(/\*.*)", RegexOptions.Singleline | RegexCompiledOption);
            CSharpCommentRegex3 = new Regex(@"(/\*.*?\*/)|(.*\*/)", RegexOptions.Singleline | RegexOptions.RightToLeft | RegexCompiledOption);
            CSharpNumberRegex = new Regex(@"\b\d+[\.]?\d*([eE]\-?\d+)?[lLdDfF]?\b|\b0x[a-fA-F\d]+\b", RegexCompiledOption);
            CSharpAttributeRegex = new Regex(@"^\s*(?<range>\[.+?\])\s*$", RegexOptions.Multiline | RegexCompiledOption);
            CSharpClassNameRegex = new Regex(@"\b(class|struct|enum|interface)\s+(?<range>\w+?)\b", RegexCompiledOption);
            CSharpKeywordRegex = new Regex(@"\b(abstract|as|base|bool|break|byte|case|catch|char|checked|class|const|continue|decimal|default|delegate|do|double|else|enum|event|explicit|extern|false|finally|fixed|float|for|foreach|goto|if|implicit|in|int|interface|internal|is|lock|long|namespace|new|null|object|operator|out|override|params|private|protected|public|readonly|ref|return|sbyte|sealed|short|sizeof|stackalloc|static|string|struct|switch|this|throw|true|try|typeof|uint|ulong|unchecked|unsafe|ushort|using|virtual|void|volatile|while|add|alias|ascending|descending|dynamic|from|get|global|group|into|join|let|orderby|partial|remove|select|set|value|var|where|yield)\b|#region\b|#endregion\b", RegexCompiledOption);
        }
        /// <summary>
        /// Highlights C# code
        /// </summary>
        /// <param name="range"></param>
        public virtual void CSharpSyntaxHighlight(Range range)
        {
            range.tb.CommentPrefix = "//";
            range.tb.LeftBracket = '(';
            range.tb.RightBracket = ')';
            range.tb.LeftBracket2 = '\x0';
            range.tb.RightBracket2 = '\x0';
            //clear style of changed range
            range.ClearStyle(BlueStyle, BoldStyle, GrayStyle, MagentaStyle, GreenStyle, BrownStyle);
            //
            if (CSharpStringRegex == null)
                InitCShaprRegex();
            //string highlighting
            range.SetStyle(BrownStyle, CSharpStringRegex);
            //comment highlighting
            range.SetStyle(GreenStyle, CSharpCommentRegex1);
            range.SetStyle(GreenStyle, CSharpCommentRegex2);
            range.SetStyle(GreenStyle, CSharpCommentRegex3);
            //number highlighting
            range.SetStyle(MagentaStyle, CSharpNumberRegex);
            //attribute highlighting
            range.SetStyle(GrayStyle, CSharpAttributeRegex);
            //class name highlighting
            range.SetStyle(BoldStyle, CSharpClassNameRegex);
            //keyword highlighting
            range.SetStyle(BlueStyle, CSharpKeywordRegex);

            //clear folding markers
            range.ClearFoldingMarkers();
            //set folding markers
            range.SetFoldingMarkers("{", "}");//allow to collapse brackets block
            range.SetFoldingMarkers(@"#region\b", @"#endregion\b");//allow to collapse #region blocks
            range.SetFoldingMarkers(@"/\*", @"\*/");//allow to collapse comment block
        }

        Regex VBStringRegex, VBCommentRegex, VBNumberRegex, VBClassNameRegex, VBKeywordRegex;

        void InitVBRegex()
        {
            VBStringRegex = new Regex(@"""""|"".*?[^\\]""", RegexCompiledOption);
            VBCommentRegex = new Regex(@"'.*$", RegexOptions.Multiline | RegexCompiledOption);
            VBNumberRegex = new Regex(@"\b\d+[\.]?\d*([eE]\-?\d+)?\b", RegexCompiledOption);
            VBClassNameRegex = new Regex(@"\b(Class|Structure|Enum|Interface)[ ]+(?<range>\w+?)\b", RegexOptions.IgnoreCase | RegexCompiledOption);
            VBKeywordRegex = new Regex(@"\b(AddHandler|AddressOf|Alias|And|AndAlso|As|Boolean|ByRef|Byte|ByVal|Call|Case|Catch|CBool|CByte|CChar|CDate|CDbl|CDec|Char|CInt|Class|CLng|CObj|Const|Continue|CSByte|CShort|CSng|CStr|CType|CUInt|CULng|CUShort|Date|Decimal|Declare|Default|Delegate|Dim|DirectCast|Do|Double|Each|Else|ElseIf|End|EndIf|Enum|Erase|Error|Event|Exit|False|Finally|For|Friend|Function|Get|GetType|GetXMLNamespace|Global|GoSub|GoTo|Handles|If|Implements|Imports|In|Inherits|Integer|Interface|Is|IsNot|Let|Lib|Like|Long|Loop|Me|Mod|Module|MustInherit|MustOverride|MyBase|MyClass|Namespace|Narrowing|New|Next|Not|Nothing|NotInheritable|NotOverridable|Object|Of|On|Operator|Option|Optional|Or|OrElse|Overloads|Overridable|Overrides|ParamArray|Partial|Private|Property|Protected|Public|RaiseEvent|ReadOnly|ReDim|REM|RemoveHandler|Resume|Return|SByte|Select|Set|Shadows|Shared|Short|Single|Static|Step|Stop|String|Structure|Sub|SyncLock|Then|Throw|To|True|Try|TryCast|TypeOf|UInteger|ULong|UShort|Using|Variant|Wend|When|While|Widening|With|WithEvents|WriteOnly|Xor|Region)\b|(#Const|#Else|#ElseIf|#End|#If|#Region)\b", RegexOptions.IgnoreCase | RegexCompiledOption);
        }

        /// <summary>
        /// Highlights VB code
        /// </summary>
        /// <param name="range"></param>
        public virtual void VBSyntaxHighlight(Range range)
        {
            range.tb.CommentPrefix = "'";
            range.tb.LeftBracket = '(';
            range.tb.RightBracket = ')';
            range.tb.LeftBracket2 = '\x0';
            range.tb.RightBracket2 = '\x0';
            //clear style of changed range
            range.ClearStyle(BrownStyle, GreenStyle, MagentaStyle, BoldStyle, BlueStyle);
            //
            if (VBStringRegex == null)
                InitVBRegex();
            //string highlighting
            range.SetStyle(BrownStyle, VBStringRegex);
            //comment highlighting
            range.SetStyle(GreenStyle, VBCommentRegex);
            //number highlighting
            range.SetStyle(MagentaStyle, VBNumberRegex);
            //class name highlighting
            range.SetStyle(BoldStyle, VBClassNameRegex);
            //keyword highlighting
            range.SetStyle(BlueStyle, VBKeywordRegex);

            //clear folding markers
            range.ClearFoldingMarkers();
            //set folding markers
            range.SetFoldingMarkers(@"#Region\b", @"#End\s+Region\b", RegexOptions.IgnoreCase);
            range.SetFoldingMarkers(@"\b(Class|Property|Enum|Structure|Interface)[ \t]+\S+", @"\bEnd (Class|Property|Enum|Structure|Interface)\b", RegexOptions.IgnoreCase);
            range.SetFoldingMarkers(@"^\s*(?<range>While)[ \t]+\S+", @"^\s*(?<range>End While)\b", RegexOptions.Multiline | RegexOptions.IgnoreCase);
            range.SetFoldingMarkers(@"\b(Sub|Function)[ \t]+[^\s']+", @"\bEnd (Sub|Function)\b", RegexOptions.IgnoreCase);//this declared separately because Sub and Function can be unclosed
            range.SetFoldingMarkers(@"(\r|\n|^)[ \t]*(?<range>Get|Set)[ \t]*(\r|\n|$)", @"\bEnd (Get|Set)\b", RegexOptions.IgnoreCase);
            range.SetFoldingMarkers(@"^\s*(?<range>For|For\s+Each)\b", @"^\s*(?<range>Next)\b", RegexOptions.Multiline | RegexOptions.IgnoreCase);
            range.SetFoldingMarkers(@"^\s*(?<range>Do)\b", @"^\s*(?<range>Loop)\b", RegexOptions.Multiline | RegexOptions.IgnoreCase);
        }

        Regex HTMLTagRegex, HTMLTagNameRegex, HTMLEndTagRegex, HTMLAttrRegex, HTMLAttrValRegex, HTMLCommentRegex1, HTMLCommentRegex2, HTMLEntityRegex;

        void InitHTMLRegex()
        {
            HTMLCommentRegex1 = new Regex(@"(<!--.*?-->)|(<!--.*)", RegexOptions.Singleline | RegexCompiledOption);
            HTMLCommentRegex2 = new Regex(@"(<!--.*?-->)|(.*-->)", RegexOptions.Singleline | RegexOptions.RightToLeft | RegexCompiledOption);
            HTMLTagRegex = new Regex(@"<|/>|</|>", RegexCompiledOption);
            HTMLTagNameRegex = new Regex(@"<(?<range>[!\w:]+)", RegexCompiledOption);
            HTMLEndTagRegex = new Regex(@"</(?<range>[\w:]+)>", RegexCompiledOption);
            HTMLAttrRegex = new Regex(@"(?<range>[\w\d\-]{1,20}?)='[^']*'|(?<range>[\w\d\-]{1,20})=""[^""]*""|(?<range>[\w\d\-]{1,20})=[\w\d\-]{1,20}", RegexCompiledOption);
            HTMLAttrValRegex = new Regex(@"[\w\d\-]{1,20}?=(?<range>'[^']*')|[\w\d\-]{1,20}=(?<range>""[^""]*"")|[\w\d\-]{1,20}=(?<range>[\w\d\-]{1,20})", RegexCompiledOption);
            HTMLEntityRegex = new Regex(@"\&(amp|gt|lt|nbsp|quot|apos|copy|reg|#[0-9]{1,8}|#x[0-9a-f]{1,8});", RegexCompiledOption | RegexOptions.IgnoreCase);
        }

        /// <summary>
        /// Highlights HTML code
        /// </summary>
        /// <param name="range"></param>
        public virtual void HTMLSyntaxHighlight(Range range)
        {
            range.tb.CommentPrefix = null;
            range.tb.LeftBracket = '<';
            range.tb.RightBracket = '>';
            range.tb.LeftBracket2 = '(';
            range.tb.RightBracket2 = ')';
            //clear style of changed range
            range.ClearStyle(BlueStyle, MaroonStyle, RedStyle);
            //
            if (HTMLTagRegex == null)
                InitHTMLRegex();
            //comment highlighting
            range.SetStyle(GreenStyle, HTMLCommentRegex1);
            range.SetStyle(GreenStyle, HTMLCommentRegex2);
            //tag brackets highlighting
            range.SetStyle(BlueStyle, HTMLTagRegex);
            //tag name
            range.SetStyle(MaroonStyle, HTMLTagNameRegex);
            //end of tag
            range.SetStyle(MaroonStyle, HTMLEndTagRegex);
            //attributes
            range.SetStyle(RedStyle, HTMLAttrRegex);
            //attribute values
            range.SetStyle(BlueStyle, HTMLAttrValRegex);
            //html entity
            range.SetStyle(RedStyle, HTMLEntityRegex);

            //clear folding markers
            range.ClearFoldingMarkers();
            //set folding markers
            range.SetFoldingMarkers("<head", "</head>", RegexOptions.IgnoreCase);
            range.SetFoldingMarkers("<body", "</body>", RegexOptions.IgnoreCase);
            range.SetFoldingMarkers("<table", "</table>", RegexOptions.IgnoreCase);
            range.SetFoldingMarkers("<form", "</form>", RegexOptions.IgnoreCase);
            range.SetFoldingMarkers("<div", "</div>", RegexOptions.IgnoreCase);
            range.SetFoldingMarkers("<script", "</script>", RegexOptions.IgnoreCase);
            range.SetFoldingMarkers("<tr", "</tr>", RegexOptions.IgnoreCase);
        }

        Regex SQLStringRegex, SQLNumberRegex, SQLCommentRegex1, SQLCommentRegex2, SQLCommentRegex3, SQLVarRegex, SQLStatementsRegex, SQLKeywordsRegex, SQLFunctionsRegex;

        void InitSQLRegex()
        {
            SQLStringRegex = new Regex(@"""""|''|"".*?[^\\]""|'.*?[^\\]'", RegexCompiledOption);
            SQLNumberRegex = new Regex(@"\b\d+[\.]?\d*([eE]\-?\d+)?\b", RegexCompiledOption);
            SQLCommentRegex1 = new Regex(@"--.*$", RegexOptions.Multiline | RegexCompiledOption);
            SQLCommentRegex2 = new Regex(@"(/\*.*?\*/)|(/\*.*)", RegexOptions.Singleline | RegexCompiledOption);
            SQLCommentRegex3 = new Regex(@"(/\*.*?\*/)|(.*\*/)", RegexOptions.Singleline | RegexOptions.RightToLeft | RegexCompiledOption);
            SQLVarRegex = new Regex(@"@[a-zA-Z_\d]*\b", RegexCompiledOption);
            SQLStatementsRegex = new Regex(@"\b(ALTER APPLICATION ROLE|ALTER ASSEMBLY|ALTER ASYMMETRIC KEY|ALTER AUTHORIZATION|ALTER BROKER PRIORITY|ALTER CERTIFICATE|ALTER CREDENTIAL|ALTER CRYPTOGRAPHIC PROVIDER|ALTER DATABASE|ALTER DATABASE AUDIT SPECIFICATION|ALTER DATABASE ENCRYPTION KEY|ALTER ENDPOINT|ALTER EVENT SESSION|ALTER FULLTEXT CATALOG|ALTER FULLTEXT INDEX|ALTER FULLTEXT STOPLIST|ALTER FUNCTION|ALTER INDEX|ALTER LOGIN|ALTER MASTER KEY|ALTER MESSAGE TYPE|ALTER PARTITION FUNCTION|ALTER PARTITION SCHEME|ALTER PROCEDURE|ALTER QUEUE|ALTER REMOTE SERVICE BINDING|ALTER RESOURCE GOVERNOR|ALTER RESOURCE POOL|ALTER ROLE|ALTER ROUTE|ALTER SCHEMA|ALTER SERVER AUDIT|ALTER SERVER AUDIT SPECIFICATION|ALTER SERVICE|ALTER SERVICE MASTER KEY|ALTER SYMMETRIC KEY|ALTER TABLE|ALTER TRIGGER|ALTER USER|ALTER VIEW|ALTER WORKLOAD GROUP|ALTER XML SCHEMA COLLECTION|BULK INSERT|CREATE AGGREGATE|CREATE APPLICATION ROLE|CREATE ASSEMBLY|CREATE ASYMMETRIC KEY|CREATE BROKER PRIORITY|CREATE CERTIFICATE|CREATE CONTRACT|CREATE CREDENTIAL|CREATE CRYPTOGRAPHIC PROVIDER|CREATE DATABASE|CREATE DATABASE AUDIT SPECIFICATION|CREATE DATABASE ENCRYPTION KEY|CREATE DEFAULT|CREATE ENDPOINT|CREATE EVENT NOTIFICATION|CREATE EVENT SESSION|CREATE FULLTEXT CATALOG|CREATE FULLTEXT INDEX|CREATE FULLTEXT STOPLIST|CREATE FUNCTION|CREATE INDEX|CREATE LOGIN|CREATE MASTER KEY|CREATE MESSAGE TYPE|CREATE PARTITION FUNCTION|CREATE PARTITION SCHEME|CREATE PROCEDURE|CREATE QUEUE|CREATE REMOTE SERVICE BINDING|CREATE RESOURCE POOL|CREATE ROLE|CREATE ROUTE|CREATE RULE|CREATE SCHEMA|CREATE SERVER AUDIT|CREATE SERVER AUDIT SPECIFICATION|CREATE SERVICE|CREATE SPATIAL INDEX|CREATE STATISTICS|CREATE SYMMETRIC KEY|CREATE SYNONYM|CREATE TABLE|CREATE TRIGGER|CREATE TYPE|CREATE USER|CREATE VIEW|CREATE WORKLOAD GROUP|CREATE XML INDEX|CREATE XML SCHEMA COLLECTION|DELETE|DISABLE TRIGGER|DROP AGGREGATE|DROP APPLICATION ROLE|DROP ASSEMBLY|DROP ASYMMETRIC KEY|DROP BROKER PRIORITY|DROP CERTIFICATE|DROP CONTRACT|DROP CREDENTIAL|DROP CRYPTOGRAPHIC PROVIDER|DROP DATABASE|DROP DATABASE AUDIT SPECIFICATION|DROP DATABASE ENCRYPTION KEY|DROP DEFAULT|DROP ENDPOINT|DROP EVENT NOTIFICATION|DROP EVENT SESSION|DROP FULLTEXT CATALOG|DROP FULLTEXT INDEX|DROP FULLTEXT STOPLIST|DROP FUNCTION|DROP INDEX|DROP LOGIN|DROP MASTER KEY|DROP MESSAGE TYPE|DROP PARTITION FUNCTION|DROP PARTITION SCHEME|DROP PROCEDURE|DROP QUEUE|DROP REMOTE SERVICE BINDING|DROP RESOURCE POOL|DROP ROLE|DROP ROUTE|DROP RULE|DROP SCHEMA|DROP SERVER AUDIT|DROP SERVER AUDIT SPECIFICATION|DROP SERVICE|DROP SIGNATURE|DROP STATISTICS|DROP SYMMETRIC KEY|DROP SYNONYM|DROP TABLE|DROP TRIGGER|DROP TYPE|DROP USER|DROP VIEW|DROP WORKLOAD GROUP|DROP XML SCHEMA COLLECTION|ENABLE TRIGGER|EXEC|EXECUTE|FROM|INSERT|MERGE|OPTION|OUTPUT|SELECT|TOP|TRUNCATE TABLE|UPDATE|UPDATE STATISTICS|WHERE|WITH)\b", RegexOptions.IgnoreCase | RegexCompiledOption);
            SQLKeywordsRegex = new Regex(@"\b(ADD|ALL|AND|ANY|AS|ASC|AUTHORIZATION|BACKUP|BEGIN|BETWEEN|BREAK|BROWSE|BY|CASCADE|CHECK|CHECKPOINT|CLOSE|CLUSTERED|COLLATE|COLUMN|COMMIT|COMPUTE|CONSTRAINT|CONTAINS|CONTINUE|CROSS|CURRENT|CURRENT_DATE|CURRENT_TIME|CURSOR|DATABASE|DBCC|DEALLOCATE|DECLARE|DEFAULT|DENY|DESC|DISK|DISTINCT|DISTRIBUTED|DOUBLE|DUMP|ELSE|END|ERRLVL|ESCAPE|EXCEPT|EXISTS|EXIT|EXTERNAL|FETCH|FILE|FILLFACTOR|FOR|FOREIGN|FREETEXT|FULL|FUNCTION|GOTO|GRANT|GROUP|HAVING|HOLDLOCK|IDENTITY|IDENTITY_INSERT|IDENTITYCOL|IF|IN|INDEX|INNER|INTERSECT|INTO|IS|JOIN|KEY|KILL|LIKE|LINENO|LOAD|NATIONAL|NOCHECK|NONCLUSTERED|NOT|NULL|OF|OFF|OFFSETS|ON|OPEN|OR|ORDER|OUTER|OVER|PERCENT|PIVOT|PLAN|PRECISION|PRIMARY|PRINT|PROC|PROCEDURE|PUBLIC|RAISERROR|READ|READTEXT|RECONFIGURE|REFERENCES|REPLICATION|RESTORE|RESTRICT|RETURN|REVERT|REVOKE|ROLLBACK|ROWCOUNT|ROWGUIDCOL|RULE|SAVE|SCHEMA|SECURITYAUDIT|SET|SHUTDOWN|SOME|STATISTICS|TABLE|TABLESAMPLE|TEXTSIZE|THEN|TO|TRAN|TRANSACTION|TRIGGER|TSEQUAL|UNION|UNIQUE|UNPIVOT|UPDATETEXT|USE|USER|VALUES|VARYING|VIEW|WAITFOR|WHEN|WHILE|WRITETEXT)\b", RegexOptions.IgnoreCase | RegexCompiledOption);
            SQLFunctionsRegex = new Regex(@"(@@CONNECTIONS|@@CPU_BUSY|@@CURSOR_ROWS|@@DATEFIRST|@@DATEFIRST|@@DBTS|@@ERROR|@@FETCH_STATUS|@@IDENTITY|@@IDLE|@@IO_BUSY|@@LANGID|@@LANGUAGE|@@LOCK_TIMEOUT|@@MAX_CONNECTIONS|@@MAX_PRECISION|@@NESTLEVEL|@@OPTIONS|@@PACKET_ERRORS|@@PROCID|@@REMSERVER|@@ROWCOUNT|@@SERVERNAME|@@SERVICENAME|@@SPID|@@TEXTSIZE|@@TRANCOUNT|@@VERSION)\b|\b(ABS|ACOS|APP_NAME|ASCII|ASIN|ASSEMBLYPROPERTY|AsymKey_ID|ASYMKEY_ID|asymkeyproperty|ASYMKEYPROPERTY|ATAN|ATN2|AVG|CASE|CAST|CEILING|Cert_ID|Cert_ID|CertProperty|CHAR|CHARINDEX|CHECKSUM_AGG|COALESCE|COL_LENGTH|COL_NAME|COLLATIONPROPERTY|COLLATIONPROPERTY|COLUMNPROPERTY|COLUMNS_UPDATED|COLUMNS_UPDATED|CONTAINSTABLE|CONVERT|COS|COT|COUNT|COUNT_BIG|CRYPT_GEN_RANDOM|CURRENT_TIMESTAMP|CURRENT_TIMESTAMP|CURRENT_USER|CURRENT_USER|CURSOR_STATUS|DATABASE_PRINCIPAL_ID|DATABASE_PRINCIPAL_ID|DATABASEPROPERTY|DATABASEPROPERTYEX|DATALENGTH|DATALENGTH|DATEADD|DATEDIFF|DATENAME|DATEPART|DAY|DB_ID|DB_NAME|DECRYPTBYASYMKEY|DECRYPTBYCERT|DECRYPTBYKEY|DECRYPTBYKEYAUTOASYMKEY|DECRYPTBYKEYAUTOCERT|DECRYPTBYPASSPHRASE|DEGREES|DENSE_RANK|DIFFERENCE|ENCRYPTBYASYMKEY|ENCRYPTBYCERT|ENCRYPTBYKEY|ENCRYPTBYPASSPHRASE|ERROR_LINE|ERROR_MESSAGE|ERROR_NUMBER|ERROR_PROCEDURE|ERROR_SEVERITY|ERROR_STATE|EVENTDATA|EXP|FILE_ID|FILE_IDEX|FILE_NAME|FILEGROUP_ID|FILEGROUP_NAME|FILEGROUPPROPERTY|FILEPROPERTY|FLOOR|fn_helpcollations|fn_listextendedproperty|fn_servershareddrives|fn_virtualfilestats|fn_virtualfilestats|FORMATMESSAGE|FREETEXTTABLE|FULLTEXTCATALOGPROPERTY|FULLTEXTSERVICEPROPERTY|GETANSINULL|GETDATE|GETUTCDATE|GROUPING|HAS_PERMS_BY_NAME|HOST_ID|HOST_NAME|IDENT_CURRENT|IDENT_CURRENT|IDENT_INCR|IDENT_INCR|IDENT_SEED|IDENTITY\(|INDEX_COL|INDEXKEY_PROPERTY|INDEXPROPERTY|IS_MEMBER|IS_OBJECTSIGNED|IS_SRVROLEMEMBER|ISDATE|ISDATE|ISNULL|ISNUMERIC|Key_GUID|Key_GUID|Key_ID|Key_ID|KEY_NAME|KEY_NAME|LEFT|LEN|LOG|LOG10|LOWER|LTRIM|MAX|MIN|MONTH|NCHAR|NEWID|NTILE|NULLIF|OBJECT_DEFINITION|OBJECT_ID|OBJECT_NAME|OBJECT_SCHEMA_NAME|OBJECTPROPERTY|OBJECTPROPERTYEX|OPENDATASOURCE|OPENQUERY|OPENROWSET|OPENXML|ORIGINAL_LOGIN|ORIGINAL_LOGIN|PARSENAME|PATINDEX|PATINDEX|PERMISSIONS|PI|POWER|PUBLISHINGSERVERNAME|PWDCOMPARE|PWDENCRYPT|QUOTENAME|RADIANS|RAND|RANK|REPLACE|REPLICATE|REVERSE|RIGHT|ROUND|ROW_NUMBER|ROWCOUNT_BIG|RTRIM|SCHEMA_ID|SCHEMA_ID|SCHEMA_NAME|SCHEMA_NAME|SCOPE_IDENTITY|SERVERPROPERTY|SESSION_USER|SESSION_USER|SESSIONPROPERTY|SETUSER|SIGN|SignByAsymKey|SignByCert|SIN|SOUNDEX|SPACE|SQL_VARIANT_PROPERTY|SQRT|SQUARE|STATS_DATE|STDEV|STDEVP|STR|STUFF|SUBSTRING|SUM|SUSER_ID|SUSER_NAME|SUSER_SID|SUSER_SNAME|SWITCHOFFSET|SYMKEYPROPERTY|symkeyproperty|sys\.dm_db_index_physical_stats|sys\.fn_builtin_permissions|sys\.fn_my_permissions|SYSDATETIME|SYSDATETIMEOFFSET|SYSTEM_USER|SYSTEM_USER|SYSUTCDATETIME|TAN|TERTIARY_WEIGHTS|TEXTPTR|TODATETIMEOFFSET|TRIGGER_NESTLEVEL|TYPE_ID|TYPE_NAME|TYPEPROPERTY|UNICODE|UPDATE\(|UPPER|USER_ID|USER_NAME|USER_NAME|VAR|VARP|VerifySignedByAsymKey|VerifySignedByCert|XACT_STATE|YEAR)\b", RegexOptions.IgnoreCase | RegexCompiledOption);
        }

        /// <summary>
        /// Highlights SQL code
        /// </summary>
        /// <param name="range"></param>
        public virtual void SQLSyntaxHighlight(Range range)
        {
            range.tb.CommentPrefix = "--";
            range.tb.LeftBracket = '(';
            range.tb.RightBracket = ')';
            range.tb.LeftBracket2 = '\x0';
            range.tb.RightBracket2 = '\x0';
            //clear style of changed range
            range.ClearStyle(RedStyle, MagentaStyle, GreenStyle, BlueBoldStyle, BlueStyle, MaroonStyle);
            //
            if (SQLStringRegex == null)
                InitSQLRegex();
            //comment highlighting
            range.SetStyle(GreenStyle, SQLCommentRegex1);
            range.SetStyle(GreenStyle, SQLCommentRegex2);
            range.SetStyle(GreenStyle, SQLCommentRegex3);
            //string highlighting
            range.SetStyle(RedStyle, SQLStringRegex);
            //number highlighting
            range.SetStyle(MagentaStyle, SQLNumberRegex);
            //var highlighting
            range.SetStyle(MaroonStyle, SQLVarRegex);
            //statements
            range.SetStyle(BlueBoldStyle, SQLStatementsRegex);
            //keywords
            range.SetStyle(BlueStyle, SQLKeywordsRegex);
            //functions
            range.SetStyle(MaroonStyle, SQLFunctionsRegex);

            //clear folding markers
            range.ClearFoldingMarkers();
            //set folding markers
            range.SetFoldingMarkers(@"\bBEGIN\b", @"\bEND\b", RegexOptions.IgnoreCase);//allow to collapse BEGIN..END blocks
            range.SetFoldingMarkers(@"/\*", @"\*/");//allow to collapse comment block
        }

        Regex PHPStringRegex, PHPNumberRegex, PHPCommentRegex1, PHPCommentRegex2, PHPCommentRegex3, PHPVarRegex, PHPKeywordRegex1, PHPKeywordRegex2, PHPKeywordRegex3;

        void InitPHPRegex()
        {
            PHPStringRegex = new Regex(@"""""|''|"".*?[^\\]""|'.*?[^\\]'", RegexCompiledOption);
            PHPNumberRegex = new Regex(@"\b\d+[\.]?\d*\b", RegexCompiledOption);
            PHPCommentRegex1 = new Regex(@"(//|#).*$", RegexOptions.Multiline | RegexCompiledOption);
            PHPCommentRegex2 = new Regex(@"(/\*.*?\*/)|(/\*.*)", RegexOptions.Singleline | RegexCompiledOption);
            PHPCommentRegex3 = new Regex(@"(/\*.*?\*/)|(.*\*/)", RegexOptions.Singleline | RegexOptions.RightToLeft | RegexCompiledOption);
            PHPVarRegex = new Regex(@"\$[a-zA-Z_\d]*\b", RegexCompiledOption);
            PHPKeywordRegex1 = new Regex(@"\b(die|echo|empty|exit|eval|include|include_once|isset|list|require|require_once|return|print|unset)\b", RegexCompiledOption);
            PHPKeywordRegex2 = new Regex(@"\b(abstract|and|array|as|break|case|catch|cfunction|class|clone|const|continue|declare|default|do|else|elseif|enddeclare|endfor|endforeach|endif|endswitch|endwhile|extends|final|for|foreach|function|global|goto|if|implements|instanceof|interface|namespace|new|or|private|protected|public|static|switch|throw|try|use|var|while|xor)\b", RegexCompiledOption);
            PHPKeywordRegex3 = new Regex(@"__CLASS__|__DIR__|__FILE__|__LINE__|__FUNCTION__|__METHOD__|__NAMESPACE__", RegexCompiledOption);
        }

        /// <summary>
        /// Highlights PHP code
        /// </summary>
        /// <param name="range"></param>
        public virtual void PHPSyntaxHighlight(Range range)
        {
            range.tb.CommentPrefix = "#";
            range.tb.LeftBracket = '(';
            range.tb.RightBracket = ')';
            range.tb.LeftBracket2 = '\x0';
            range.tb.RightBracket2 = '\x0';
            //clear style of changed range
            range.ClearStyle(BlueStyle, GrayStyle, MagentaStyle, GreenStyle, RedStyle, MaroonStyle);
            //
            if (PHPStringRegex == null)
                InitPHPRegex();
            //string highlighting
            range.SetStyle(RedStyle, PHPStringRegex);
            //comment highlighting
            range.SetStyle(GreenStyle, PHPCommentRegex1);
            range.SetStyle(GreenStyle, PHPCommentRegex2);
            range.SetStyle(GreenStyle, PHPCommentRegex3);
            //number highlighting
            range.SetStyle(RedStyle, PHPNumberRegex);
            //var highlighting
            range.SetStyle(MaroonStyle, PHPVarRegex);
            //keyword highlighting
            range.SetStyle(MagentaStyle, PHPKeywordRegex1);
            range.SetStyle(BlueStyle, PHPKeywordRegex2);
            range.SetStyle(GrayStyle, PHPKeywordRegex3);

            //clear folding markers
            range.ClearFoldingMarkers();
            //set folding markers
            range.SetFoldingMarkers("{", "}");//allow to collapse brackets block
            range.SetFoldingMarkers(@"/\*", @"\*/");//allow to collapse comment block
        }

        Regex JScriptStringRegex, JScriptCommentRegex1, JScriptCommentRegex2, JScriptCommentRegex3, JScriptNumberRegex, JScriptKeywordRegex;

        void InitJScriptRegex()
        {
            JScriptStringRegex = new Regex(@"""""|''|"".*?[^\\]""|'.*?[^\\]'", RegexCompiledOption);
            JScriptCommentRegex1 = new Regex(@"//.*$", RegexOptions.Multiline | RegexCompiledOption);
            JScriptCommentRegex2 = new Regex(@"(/\*.*?\*/)|(/\*.*)", RegexOptions.Singleline | RegexCompiledOption);
            JScriptCommentRegex3 = new Regex(@"(/\*.*?\*/)|(.*\*/)", RegexOptions.Singleline | RegexOptions.RightToLeft | RegexCompiledOption);
            JScriptNumberRegex = new Regex(@"\b\d+[\.]?\d*([eE]\-?\d+)?[lLdDfF]?\b|\b0x[a-fA-F\d]+\b", RegexCompiledOption);
            JScriptKeywordRegex = new Regex(@"\b(true|false|break|case|catch|const|continue|default|delete|do|else|export|for|function|if|in|instanceof|new|null|return|switch|this|throw|try|var|void|while|with|typeof)\b", RegexCompiledOption);
        }

        /// <summary>
        /// Highlights JavaScript code
        /// </summary>
        /// <param name="range"></param>
        public virtual void JScriptSyntaxHighlight(Range range)
        {
            range.tb.CommentPrefix = "//";
            range.tb.LeftBracket = '(';
            range.tb.RightBracket = ')';
            range.tb.LeftBracket2 = '\x0';
            range.tb.RightBracket2 = '\x0';
            //clear style of changed range
            range.ClearStyle(BlueStyle, BoldStyle, GrayStyle, MagentaStyle, GreenStyle, BrownStyle);
            //
            if (JScriptStringRegex == null)
                InitJScriptRegex();
            //string highlighting
            range.SetStyle(BrownStyle, JScriptStringRegex);
            //comment highlighting
            range.SetStyle(GreenStyle, JScriptCommentRegex1);
            range.SetStyle(GreenStyle, JScriptCommentRegex2);
            range.SetStyle(GreenStyle, JScriptCommentRegex3);
            //number highlighting
            range.SetStyle(MagentaStyle, JScriptNumberRegex);
            //keyword highlighting
            range.SetStyle(BlueStyle, JScriptKeywordRegex);
            //clear folding markers
            range.ClearFoldingMarkers();
            //set folding markers
            range.SetFoldingMarkers("{", "}");//allow to collapse brackets block
            range.SetFoldingMarkers(@"/\*", @"\*/");//allow to collapse comment block
        }


        public void Dispose()
        {
            foreach (var desc in descByXMLfileNames.Values)
                desc.Dispose();
        }
    }

    /// <summary>
    /// Language
    /// </summary>
    public enum Language
    {
        Custom, CSharp, VB, HTML, SQL, PHP, JS
    }
}