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 += @"&";
break;
case ' ':
Result += @" ";
break;
case '<':
Result += @"<";
break;
case '>':
Result += @">";
break;
case '"':
Result += @""";
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));
}
}
}
