使用正则表达式实现的语法分析引擎(C#源代码)

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Text.RegularExpressions;

namespace SyntaxEngineClass
{
    /// <summary>
    /// 语法分析引擎基类
    /// ZswangY37 wjhu111#21cn.com 2007-03-17 尊重作者，转贴请注明出处
    /// 日期:2007-03-17
    /// 设计:ZswangY37
    /// 支持:wjhu111#21cn.com
    /// 感谢CSDN中的kissknife、chinnel提供改进意见
    /// http://community.csdn.net/Expert/TopicView.asp?id=5400165
    /// </summary>
    class SyntaxEngine
    {
        /// <summary>
        /// 语法项
        /// </summary>
        public class SyntaxItem
        {
            private string FPattern; // 正则表达式
            private RegexOptions FOptions; // 正则表达式附加选项
            private string FName; // 语法名称
            private int FIndex; // 序号

            public string Pattern { get { return FPattern; } } // 正则表达式
            public RegexOptions Options { get { return FOptions; } } // 正则表达式附加选项
            public string Name { get { return FName; } } // 名称
            public int Index { get { return FIndex; } } // 序号

            public SyntaxItem(string APattern, RegexOptions AOptions,
                string AName, int AIndex)
            {
                FPattern = APattern;
                FOptions = AOptions;
                FName = AName;
                FIndex = AIndex;
            }
        }
        /// <summary>
        /// 语法分析返回项
        /// </summary>
        public class AnalyzeReslut
        {
            private SyntaxItem FItem; // 所属语法项
            private string FBlock; // 文字块

            public SyntaxItem Item { get { return FItem; } }
            public string Block { get { return FBlock; } }

            public AnalyzeReslut(SyntaxItem AItem, string ABlock)
            {
                FItem = AItem;
                FBlock = ABlock;
            }
        }

        private List<SyntaxItem> FSyntaxItems = new List<SyntaxItem>();
        private List<AnalyzeReslut> FAnalyzeResluts = new List<AnalyzeReslut>();

        public List<SyntaxItem> SyntaxItems { get { return FSyntaxItems; } }
        public List<AnalyzeReslut> AnalyzeResluts { get { return FAnalyzeResluts; } }

        /// <summary>
        /// 进行语法分析
        /// </summary>
        /// <param name="ACode">所分析的代码</param>
        /// <returns>返回分析是否成功</returns>
        public virtual bool Analyze(string ACode)
        {
            if (FSyntaxItems.Count <= 0)
                return false;
            if (ACode == null)
                return false;
            AnalyzeResluts.Clear();
            string vCode = ACode;
            bool vFind = true;
            while (vFind && (vCode.Length > 0))
            {
                vFind = false;
                foreach (SyntaxItem vSyntaxItem in FSyntaxItems)
                {
                    if (Regex.IsMatch(vCode, vSyntaxItem.Pattern, vSyntaxItem.Options))
                    {
                        AnalyzeResluts.Add(new AnalyzeReslut(vSyntaxItem,
                            Regex.Match(vCode, vSyntaxItem.Pattern,
                            vSyntaxItem.Options).Value));
                        vCode = Regex.Replace(vCode, vSyntaxItem.Pattern, "",
                            vSyntaxItem.Options);
                        vFind = true;
                        break;
                    }
                }
            }
            return true;
        }
    }

    /// <summary>
    /// C#语法分析引擎
    /// ZswangY37 wjhu111#21cn.com 2007-03-17 尊重作者，转贴请注明出处
    /// </summary>
    class CSharpEngine : SyntaxEngine
    {
        public CSharpEngine()
        {
            SyntaxItems.Add(new SyntaxItem(@"^\s+", RegexOptions.None,
                "空白", SyntaxItems.Count));
            SyntaxItems.Add(new SyntaxItem(@"^\/\/[^\n]*[\n]?", RegexOptions.None,
                "单行注释", SyntaxItems.Count));
            SyntaxItems.Add(new SyntaxItem(@"^\/\*.*?\*\/", RegexOptions.None,
                "多行注释", SyntaxItems.Count));
            SyntaxItems.Add(new SyntaxItem(@"^#\s*(define|elif|else|endif|endregion|" +
                @"error|if|line|pragma|region|undef|using|warning)\b[^\n]*[\n]?",
                RegexOptions.None, "指令", SyntaxItems.Count));
            SyntaxItems.Add(new SyntaxItem(@"^(abstract|event|new|struct|as|explicit|" +
                @"null|switch|base|extern|object|this|bool|false|operator|throw|break|" +
                @"finally|out|true|byte|fixed|override|try|case|float|params|typeof|" +
                @"catch|for|private|uint|char|foreach|protected|ulong|checked|goto|" +
                @"public|unchecked|class|if|readonly|unsafe|const|implicit|ref|ushort|" +
                @"continue|in|return|using|decimal|int|sbyte|virtual|default|interface|" +
                @"sealed|volatile|delegate|internal|short|void|do|is|sizeof|while|" +
                @"double|lock|stackalloc|else|long|static|enum|namespace|string)\b",
                RegexOptions.None, "关键字", SyntaxItems.Count));
            SyntaxItems.Add(new SyntaxItem(@"^(get|partial|set|value|where|yield)\b",
                RegexOptions.None, "上下文关键字", SyntaxItems.Count));
            SyntaxItems.Add(new SyntaxItem(@"^(\+\=|\-\=|\&\&|\|\||\/\=|\&\=|\%\=|\~|\!|\+\+|\-\-|" +
                @"\#|\$|\%|\^|\&|\*|\(|\)|\+|\-|\=|\{|\}|\[|\]|\\|\;|\:|\<|\>|\?|\,|\.|\/)+",
                RegexOptions.None, "标点符号", SyntaxItems.Count));
            SyntaxItems.Add(new SyntaxItem(@"^(\d+(?!\.|x|e|d|m)u?)|^0x([\da-f]+(?!\.|x|m)u?)",
                RegexOptions.IgnoreCase, "整数", SyntaxItems.Count));
            SyntaxItems.Add(new SyntaxItem(@"^(\d+)?\.\d+((\+|\-)?e\d+)?(m|d|f)?|^\d+((\+|\-)?e\d+)?(m|d|f)",
                RegexOptions.IgnoreCase, "浮点数", SyntaxItems.Count));
            SyntaxItems.Add(new SyntaxItem(@"^@""(("""")*([^""])*)*""|^""((\\\\)*(\\"")*(\\[a-z])*[^""^\\]*)*""",
                RegexOptions.None, "字符串", SyntaxItems.Count));
            SyntaxItems.Add(new SyntaxItem(@"^\'(\\\')*[^\']*\'", RegexOptions.None,
                "字符", SyntaxItems.Count));
            SyntaxItems.Add(new SyntaxItem(@"^\w*", RegexOptions.None,
                "标识符", SyntaxItems.Count));
        }
    }

    /// <summary>
    /// 语法高亮引擎
    /// ZswangY37 wjhu111#21cn.com 2007-03-17 尊重作者，转贴请注明出处
    /// </summary>
    class SyntaxHighlight
    {
        public class HighlightItem
        {
            private Color FForeColor; // 前景色
            private bool FBold; // 是否加粗
            private bool FItalic; // 是否斜体
            private bool FUnderline; // 是否下划线
            public Color ForeColor { get { return FForeColor; } } // 前景色
            public bool Bold { get { return FBold; } } // 是否加粗
            public bool Italic { get { return FItalic; } } // 是否斜体
            public bool Underline { get { return FUnderline; } } // 是否下划线
            public HighlightItem(Color AForeColor, bool ABold, bool AItalic, bool AUnderline)
            {
                FForeColor = AForeColor;
                FBold = ABold;
                FItalic = AItalic;
                FUnderline = AUnderline;
            }
        }
        private List<SyntaxEngine.AnalyzeReslut> FAnalyzeResluts;
        private Font FDefaultFont;
        private List<HighlightItem> FHighlightItems = new List<HighlightItem>();
        public List<HighlightItem> HighlightItems { get { return FHighlightItems; } }
        public SyntaxHighlight(SyntaxEngine ASyntaxEngine, Font
            ADefaultFont)
        {
            FAnalyzeResluts = ASyntaxEngine.AnalyzeResluts;
            FDefaultFont = ADefaultFont;
        }
        /// <summary>
        /// 将文本中的RTF元素处理掉
        /// </summary>
        /// <param name="AText">输入的文本</param>
        /// <returns>返回处理后的RTF文本</returns>
        public string TextToRtf(string AText)
        {
            string Result = "";
            foreach (char vChar in AText)
            {
                switch (vChar)
                {
                case '\\':
                    Result += @"\\";
                    break;
                case '{':
                    Result += @"\{";
                    break;
                case '}':
                    Result += @"\}";
                    break;
                default:
                    if (vChar > (char) 127)
                        Result += @"\u" + ((int) vChar).ToString() + "?";
                    else
                        Result += vChar;
                    break;
                }
            }
            return Result;
        }

        [DllImport("user32.dll")]
        private static extern uint GetKBCodePage();
        [DllImport("kernel32.dll")]
        private static extern ushort GetSystemDefaultLangID();

        /// <summary>
        /// 将代码处理成RTF格式
        /// </summary>
        /// <returns>返回处理后的RTF文本</returns>
        public string MakeRtf()
        {
            if (HighlightItems.Count <= 0)
                return "";
            string Result = @"{\rtf1\ansi\ansicpg" + GetKBCodePage().ToString() +
                @"\deff0\deflang1033\deflangfe" + GetSystemDefaultLangID().ToString() +
                @"{\fonttbl{\f0\fmodern " +
                FDefaultFont.Name + ";}}\r\n";
            Result += @"{\colortbl ;";
            foreach (HighlightItem vHighlightItem in HighlightItems)
                Result += string.Format(@"\red{0}\green{1}\blue{2};",
                    vHighlightItem.ForeColor.R, vHighlightItem.ForeColor.G,
                    vHighlightItem.ForeColor.B);
            Result += "}\r\n";
            Result += @"\viewkind4\uc1\pard\f0\fs20" + "\r\n";
            bool vBold = false, vItalic = false, vUnderline = false;
            foreach (SyntaxEngine.AnalyzeReslut vAnalyzeReslut in
              FAnalyzeResluts)
            {
                int i = vAnalyzeReslut.Item.Index;
                if (i >= HighlightItems.Count)
                    i = 0;
                if (vBold != HighlightItems[i].Bold)
                {
                    if (HighlightItems[i].Bold)
                        Result += @"\b1";
                    else
                        Result += @"\b0";
                }
                if (vItalic != HighlightItems[i].Italic)
                {
                    if (HighlightItems[i].Italic)
                        Result += @"\i1";
                    else
                        Result += @"\i0";
                }
                if (vItalic != HighlightItems[i].Underline)
                {
                    if (HighlightItems[i].Underline)
                        Result += @"\ul1";
                    else
                        Result += @"\ul0";
                }
                Result += string.Format(@"\cf{0} ", i + 1);
                vBold = HighlightItems[i].Bold;
                vItalic = HighlightItems[i].Italic;
                vUnderline = HighlightItems[i].Underline;
                Result += TextToRtf(vAnalyzeReslut.Block).Replace("\r\n",
                    "\r\n" + @"\par");
            }
            return Result + "}";
        }

        /// <summary>
        /// 将文本中的HTML元素处理掉
        /// </summary>
        /// <param name="AText">输入的文本</param>
        /// <returns>返回处理后的HTML文本</returns>
        private string TextToHtml(string AText)
        {
            string Result = "";
            foreach (char vChar in AText)
            {
                switch (vChar)
                {
                case '&':
                    Result += @"&amp;";
                    break;
                case ' ':
                    Result += @"&nbsp;";
                    break;
                case '<':
                    Result += @"&lt;";
                    break;
                case '>':
                    Result += @"&gt;";
                    break;
                case '"':
                    Result += @"&quot;";
                    break;
                //case '\n':
                //    Result += @"<br>";
                //    break;
                default:
                    if (vChar > (char) 127)
                        Result += @"&#" + ((int) vChar).ToString() + ";";
                    else
                        Result += vChar;
                    break;
                }
            }
            return Result;
        }

        /// <summary>
        /// 将颜色处理为HTML表达的方式
        /// </summary>
        /// <param name="AColor">输入的颜色</param>
        /// <returns>返回HTML颜色表达式</returns>
        private string ColorToHtml(Color AColor)
        {
            return string.Format("#{0:X2}{1:X2}{2:X2}", AColor.R, AColor.G, AColor.B);
        }

        /// <summary>
        /// 将代码处理为HTML文本
        /// </summary>
        /// <returns>返回处理后的HTML文本</returns>
        public string MakeHtml()
        {
            string Result = @"<code><pre style=""font-size:" + FDefaultFont.Size +
                @"pt;font-family:" + FDefaultFont.Name + @""">";
            foreach (SyntaxEngine.AnalyzeReslut vAnalyzeReslut in
              FAnalyzeResluts)
            {
                int i = vAnalyzeReslut.Item.Index;
                if (i >= HighlightItems.Count)
                    i = 0;
                string vLeft = string.Format(@"<span style=""color={0}"">",
                    ColorToHtml(HighlightItems[i].ForeColor));
                string vRight = "</span>";
                if (HighlightItems[i].Bold)
                {
                    vLeft += "<b>";
                    vRight = "</b>" + vRight;
                }
                if (HighlightItems[i].Italic)
                {
                    vLeft += "<i>";
                    vRight = "</i>" + vRight;
                }
                if (HighlightItems[i].Underline)
                {
                    vLeft += "<u>";
                    vRight = "</u>" + vRight;
                }

                Result += vLeft + TextToHtml(vAnalyzeReslut.Block) + vRight;
            }

            return Result + "</pre></code>";
        }
    }

    /// <summary>
    /// C#语法高亮引擎
    /// </summary>
    class CSharpHighlight : SyntaxHighlight
    {
        public CSharpHighlight(SyntaxEngine ASyntaxEngine, Font
            ADefaultFont)
            : base(ASyntaxEngine, ADefaultFont)
        {
            //空白
            HighlightItems.Add(new HighlightItem(Color.White, false, false, false));
            //单行注释
            HighlightItems.Add(new HighlightItem(Color.Green, false, false, false));
            //多行注释
            HighlightItems.Add(new HighlightItem(Color.Green, false, false, false));
            //指令
            HighlightItems.Add(new HighlightItem(Color.Blue, false, false, false));
            //关键字
            HighlightItems.Add(new HighlightItem(Color.Black, true, false, false));
            //上下文关键字
            HighlightItems.Add(new HighlightItem(Color.Black, true, false, false));
            //标点符号
            HighlightItems.Add(new HighlightItem(Color.BlueViolet, false, false, false));
            //整数
            HighlightItems.Add(new HighlightItem(Color.Red, true, false, false));
            //浮点数
            HighlightItems.Add(new HighlightItem(Color.Red, true, false, false));
            //字符串
            HighlightItems.Add(new HighlightItem(Color.Maroon, false, false, false));
            //字符
            HighlightItems.Add(new HighlightItem(Color.Maroon, false, false, false));
            //标识符
            HighlightItems.Add(new HighlightItem(Color.Black, false, false, false));
        }
    }
}