JavaScript版代码高亮

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我是靠谱客的博主唠叨钢笔，最近开发中收集的这篇文章主要介绍JavaScript版代码高亮，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JavaScript版代码高亮</title>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>

<body>
<div class="menu_head">JavaScript版代码高亮显示</div>
<div class="content">
<script language="JavaScript" type="text/javascript">
/**
** ======================================================================================
** 类名：CLASS_HIGHLIGHT
** 功能：语法高亮
** 示例：
var xx = new CLASS_HIGHLIGHT(code,syntax);
document.getElementById("display").innerHTML = xx.highlight();
** ======================================================================================
**/

this._caseSensitive = true;

//字符串转换为哈希表
this.str2hashtable = function(key,cs){
  var _key = key.split(/,/g);
  var _hash = new Hashtable();
  var _cs  = true;

  if(typeof(cs)=="undefined"||cs==null){
   _cs = this._caseSensitive;
  } else {
   _cs = cs;
  }

  for(var i in _key){
   if(_cs){
    _hash.add(_key[i]);
   } else {
    _hash.add((_key[i]+"").toLowerCase());
   }
  }
  return _hash;
}

//获得需要转换的代码
this._codetxt = code;
if(typeof(syntax)=="undefined"){
syntax = "";
}

switch(syntax.toLowerCase()){
  case "sql":
   //是否大小写敏感
   this._caseSensitive = false;
   //得到关键字哈希表
   this._keywords  = this.str2hashtable("COMMIT,DELETE,INSERT,LOCK,ROLLBACK,SELECT,TRANSACTION,READ,ONLY,WRITE,USE,ROLLBACK,SEGMENT,ROLE,EXCEPT,NONE,UPDATE,DUAL,WORK,COMMENT,FORCE,FROM,WHERE,INTO,VALUES,ROW,SHARE,MODE,EXCLUSIVE,UPDATE,ROW,NOWAIT,TO,SAVEPOINT,UNION,UNION,ALL,INTERSECT,MINUS,START,WITH,CONNECT,BY,GROUP,HAVING,ORDER,UPDATE,NOWAIT,IDENTIFIED,SET,DROP,PACKAGE,CREATE,REPLACE,PROCEDURE,FUNCTION,TABLE,RETURN,AS,BEGIN,DECLARE,END,IF,THEN,ELSIF,ELSE,WHILE,CURSOR,EXCEPTION,WHEN,OTHERS,NO_DATA_FOUND,TOO_MANY_ROWS,CURSOR_ALREADY_OPENED,FOR,LOOP,IN,OUT,TYPE,OF,INDEX,BINARY_INTEGER,RAISE,ROWTYPE,VARCHAR2,NUMBER,LONG,DATE,RAW,LONG RAW,CHAR,INTEGER,MLSLABEL,CURRENT,OF,DEFAULT,CURRVAL,NEXTVAL,LEVEL,ROWID,ROWNUM,DISTINCT,ALL,LIKE,IS,NOT,NULL,BETWEEN,ANY,AND,OR,EXISTS,ASC,DESC,ABS,CEIL,COS,COSH,EXP,FLOOR,LN,LOG,MOD,POWER,ROUND,SIGN,SIN,SINH,SQRT,TAN,TANH,TRUNC,CHR,CONCAT,INITCAP,LOWER,LPAD,LTRIM,NLS_INITCAP,NLS_LOWER,NLS_UPPER,REPLACE,RPAD,RTRIM,SOUNDEX,SUBSTR,SUBSTRB,TRANSLATE,UPPER,ASCII,INSTR,INSTRB,LENGTH,LENGTHB,NLSSORT,ADD_MONTHS,LAST_DAY,MONTHS_BETWEEN,NEW_TIME,NEXT_DAY,ROUND,SYSDATE,TRUNC,CHARTOROWID,CONVERT,HEXTORAW,RAWTOHEX,ROWIDTOCHAR,TO_CHAR,TO_DATE,TO_LABEL,TO_MULTI_BYTE,TO_NUMBER,TO_SINGLE_BYTE,DUMP,GREATEST,GREATEST_LB,LEAST,LEAST_UB,NVL,UID,USER,USERENV,VSIZE,AVG,COUNT,GLB,LUB,MAX,MIN,STDDEV,SUM,VARIANCE");
   //得到内建对象哈希表
   this._commonObjects = this.str2hashtable("");
   //标记
   this._tags   = this.str2hashtable("",false);
   //得到分割字符
   this._wordDelimiters= "　 ,.?!;:\/<>(){}[]"'rnt=+-|*%@#$^&";
   //引用字符
   this._quotation  = this.str2hashtable("'");
   //行注释字符
   this._lineComment = "--";
   //转义字符
   this._escape  = "";
   //多行引用开始
   this._commentOn  = "/*";
   //多行引用结束
   this._commentOff = "*/";
   //忽略词
   this._ignore  = "";
   //是否处理标记
   this._dealTag  = false;
   break;
  case "c#":
   //是否大小写敏感
   this._caseSensitive = true;
   //得到关键字哈希表
   this._keywords  = this.str2hashtable("abstract,as,base,bool,break,byte,case,catch,char,checked,class,const,continue,decimal,default,delegate,do,double,else,enum,event,explicit,extern,false,finally,fixed,float,for,foreach,get,goto,if,implicit,in,int,interface,internal,is,lock,long,namespace,new,null,object,operator,out,override,params,private,protected,public,readonly,ref,return,sbyte,sealed,short,sizeof,stackalloc,static,set,string,struct,switch,this,throw,true,try,typeof,uint,ulong,unchecked,unsafe,ushort,using,value,virtual,void,volatile,while");
   //得到内建对象哈希表
   this._commonObjects = this.str2hashtable("String,Boolean,DateTime,Int32,Int64,Exception,DataTable,DataReader");
   //标记
   this._tags   = this.str2hashtable("",false);
   //得到分割字符
   this._wordDelimiters= "　 ,.?!;:\/<>(){}[]"'rnt=+-|*%@#$^&";
   //引用字符
   this._quotation  = this.str2hashtable(""");
   //行注释字符
   this._lineComment = "//";
   //转义字符
   this._escape  = "\";
   //多行引用开始
   this._commentOn  = "/*";
   //多行引用结束
   this._commentOff = "*/";
   //忽略词
   this._ignore  = "";
   //是否处理标记
   this._dealTag  = false;
   break;
  case "java":
   //是否大小写敏感
   this._caseSensitive = true;
   //得到关键字哈希表
   this._keywords  = this.str2hashtable("abstract,boolean,break,byte,case,catch,char,class,const,continue,default,do,double,else,extends,final,finally,float,for,goto,if,implements,import,instanceof,int,interface,long,native,new,package,private,protected,public,return,short,static,strictfp,super,switch,synchronized,this,throw,throws,transient,try,void,volatile,while");
   //得到内建对象哈希表
   this._commonObjects = this.str2hashtable("String,Boolean,DateTime,Int32,Int64,Exception,DataTable,DataReader");
   //标记
   this._tags   = this.str2hashtable("",false);
   //得到分割字符
   this._wordDelimiters= "　 ,.?!;:\/<>(){}[]"'rnt=+-|*%@#$^&";
   //引用字符
   this._quotation  = this.str2hashtable(""");
   //行注释字符
   this._lineComment = "//";
   //转义字符
   this._escape  = "\";
   //多行引用开始
   this._commentOn  = "/*";
   //多行引用结束
   this._commentOff = "*/";
   //忽略词
   this._ignore  = "";
   //是否处理标记
   this._dealTag  = false;
   break;
  case "vbs":
  case "vb":
   //是否大小写敏感
   this._caseSensitive = false;
   //得到关键字哈希表
   this._keywords  = this.str2hashtable("And,ByRef,ByVal,Call,Case,Class,Const,Dim,Do,Each,Else,ElseIf,Empty,End,Eqv,Erase,Error,Exit,Explicit,False,For,Function,Get,If,Imp,In,Is,Let,Loop,Mod,Next,Not,Nothing,Null,On,Option,Or,Private,Property,Public,Randomize,ReDim,Resume,Select,Set,Step,Sub,Then,To,True,Until,Wend,While,Xor,Anchor,Array,Asc,Atn,CBool,CByte,CCur,CDate,CDbl,Chr,CInt,CLng,Cos,CreateObject,CSng,CStr,Date,DateAdd,DateDiff,DatePart,DateSerial,DateValue,Day,Dictionary,Document,Element,Err,Exp,FileSystemObject,Filter,Fix,Int,Form,FormatCurrency,FormatDateTime,FormatNumber,FormatPercent,GetObject,Hex,Hour,InputBox,InStr,InstrRev,IsArray,IsDate,IsEmpty,IsNull,IsNumeric,IsObject,Join,LBound,LCase,Left,Len,Link,LoadPicture,Location,Log,LTrim,RTrim,Trim,Mid,Minute,Month,MonthName,MsgBox,Navigator,Now,Oct,Replace,Right,Rnd,Round,ScriptEngine,ScriptEngineBuildVersion,ScriptEngineMajorVersion,ScriptEngineMinorVersion,Second,Sgn,Sin,Space,Split,Sqr,StrComp,String,StrReverse,Tan,Time,TextStream,TimeSerial,TimeValue,TypeName,UBound,UCase,VarType,Weekday,WeekDayName,Year");
   //得到内建对象哈希表
   this._commonObjects = this.str2hashtable("String,Number,Boolean,Date,Integert,Long,Double,Single");
   //标记
   this._tags   = this.str2hashtable("",false);
   //得到分割字符
   this._wordDelimiters= "　 ,.?!;:\/<>(){}[]"'rnt=+-|*%@#$^&";
   //引用字符
   this._quotation  = this.str2hashtable(""");
   //行注释字符
   this._lineComment = "'";
   //转义字符
   this._escape  = "";
   //多行引用开始
   this._commentOn  = "";
   //多行引用结束
   this._commentOff = "";
   //忽略词
   this._ignore  = "";
   //忽略词
   this._ignore  = "<!--";
   //是否处理标记
   this._dealTag  = true;
   break;
}

this.highlight = function() {
  var codeArr = new Array();
  var word_index = 0;
  var htmlTxt = new Array();

  //得到分割字符数组(分词)
  for (var i = 0; i < this._codetxt.length; i++) {
   if (this._wordDelimiters.indexOf(this._codetxt.charAt(i)) == -1) {  //找不到关键字
    if (codeArr[word_index] == null || typeof(codeArr[word_index]) == 'undefined') {
     codeArr[word_index] = "";
    }
    codeArr[word_index] += this._codetxt.charAt(i);
   } else {
    if (typeof(codeArr[word_index]) != 'undefined' && codeArr[word_index].length > 0)
     word_index++;
    codeArr[word_index++] = this._codetxt.charAt(i);
   }
  }

  var quote_opened    = false; //引用标记
  var slash_star_comment_opened = false; //多行注释标记
  var slash_slash_comment_opened = false; //单行注释标记
  var line_num     = 1;  //行号
  var quote_char     = "";  //引用标记类型
  var tag_opened     = false; //标记开始

htmlTxt[htmlTxt.length] = ("<div style='font-family: Courier New;font-size:12px;overflow:auto;margin:1px;padding:6px;color:#333333'>");

//按分割字，分块显示
for (var i=0; i <=word_index; i++){

   //处理空行（由于转义带来）
   if(typeof(codeArr[i])=="undefined"||codeArr[i].length==0){
    continue;
   }
   //处理空格
   if (codeArr[i] == " "){
    htmlTxt[htmlTxt.length] = (" ");
   //处理关键字
   } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && this.isKeyword(codeArr[i])){
    htmlTxt[htmlTxt.length] = ("<span style='color:#0000FF;'>" + codeArr[i] + "</span>");
   //处理普通对象
   } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && this.isCommonObject(codeArr[i])){
    htmlTxt[htmlTxt.length] = ("<span style='color:#808000;'>" + codeArr[i] + "</span>");
   //处理标记
   } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && tag_opened && this.isTag(codeArr[i])){
    htmlTxt[htmlTxt.length] = ("<span style='color:#0000FF;'>" + codeArr[i] + "</span>");
   //处理换行
   } else if (codeArr[i] == "r"){
    if (slash_slash_comment_opened){
     htmlTxt[htmlTxt.length] = ("</span>");
     slash_slash_comment_opened = false;
    }
    htmlTxt[htmlTxt.length] = ("<br/>");
    line_num++;
   //处理双引号（引号前不能为转义字符）
   } else if (this._quotation.contains(codeArr[i])&&!slash_star_comment_opened&&!slash_slash_comment_opened){
    if (quote_opened){
     //是相应的引号
     if (quote_char==codeArr[i]){
      if(tag_opened){
       htmlTxt[htmlTxt.length] = (codeArr[i]+"</span><span style='color:#808000;'>");
      } else {
       htmlTxt[htmlTxt.length] = (codeArr[i]+"</span>");
      }
      quote_opened = false;
      quote_char  = "";
     } else {
      htmlTxt[htmlTxt.length] = codeArr[i].replace(/</g,"<");
     }
    } else {
     if (tag_opened){
      htmlTxt[htmlTxt.length] = ("</span><span style='color:#FF00FF;'>"+codeArr[i]);
     } else {
      htmlTxt[htmlTxt.length] = ("<span style='color:#FF00FF;'>"+codeArr[i]);
     }
     quote_opened = true;
     quote_char  = codeArr[i];
    }
   //处理转义字符
   } else if(codeArr[i] == this._escape){
    htmlTxt[htmlTxt.length] = (codeArr[i]);
    if (i<word_index){
     if (codeArr[i+1].charCodeAt(0)>=32&&codeArr[i+1].charCodeAt(0)<=127){
      htmlTxt[htmlTxt.length] = codeArr[i+1].substr(0,1);
      codeArr[i+1] = codeArr[i+1].substr(1);
     }
    }
   //处理Tab
   } else if (codeArr[i] == "t") {
    htmlTxt[htmlTxt.length] = ("  ");
   //处理多行注释的开始
   } else if (this.isStartWith(this._commentOn,codeArr,i)&&!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened){
    slash_star_comment_opened = true;
    htmlTxt[htmlTxt.length] = ("<span style='color:#008000;'>" + this._commentOn.replace(/</g,"<"));
    i = i + this._commentOn.length-1;
   //处理单行注释
   } else if (this.isStartWith(this._lineComment,codeArr,i)&&!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened){
    slash_slash_comment_opened = true;
    htmlTxt[htmlTxt.length] = ("<span style='color:#008000;'>" + this._lineComment);
    i = i + this._lineComment.length-1;
   //处理忽略词
   } else if (this.isStartWith(this._ignore,codeArr,i)&&!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened){
    slash_slash_comment_opened = true;
    htmlTxt[htmlTxt.length] = ("<span style='color:#008000;'>" + this._ignore.replace(/</g,"<"));
    i = i + this._ignore.length-1;
   //处理多行注释结束
   } else if (this.isStartWith(this._commentOff,codeArr,i)&&!quote_opened&&!slash_slash_comment_opened){
    if (slash_star_comment_opened) {
     slash_star_comment_opened = false;
     htmlTxt[htmlTxt.length] = (this._commentOff +"</span>");
     i = i + this._commentOff.length-1;
    }
   //处理左标记
   } else if (this._dealTag&&!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&codeArr[i] == "<") {
    htmlTxt[htmlTxt.length] = "<<span style='color:#808000;'>";
    tag_opened = true;
   //处理右标记
   } else if (this._dealTag&&tag_opened&&codeArr[i] == ">") {
    htmlTxt[htmlTxt.length] = "</span>>";
    tag_opened = false;
   //处理HTML转义符号
   } else if (codeArr[i] == "&") {
    htmlTxt[htmlTxt.length] = "&";
   } else {
    htmlTxt[htmlTxt.length] = codeArr[i].replace(/</g,"<");
   }
  }
  htmlTxt[htmlTxt.length] = ("</div>");

return htmlTxt.join("");
}

this.isStartWith = function(str,code,index){
  if(typeof(str)!="undefined"&&str.length>0){
   for(var i=0;i<str.length;i++){
    if(this._caseSensitive){
     if(str.charAt(i)!=code[index+i]||(index+i>=code.length)){
      return false;
     }
    } else {
     if(str.charAt(i).toLowerCase()!=code[index+i].toLowerCase()||(index+i>=code.length)){
      return false;
     }
    }
   }
   return true;
  } else {
   return false;
  }
}

this.isKeyword = function(val){
return this._keywords.contains(this._caseSensitive?val:val.toLowerCase());
}

this.isCommonObject = function(val){
return this._commonObjects.contains(this._caseSensitive?val:val.toLowerCase());
}

this.isTag = function(val){
return this._tags.contains(val.toLowerCase());
}

}

function doHighlight(o, syntax){
var htmltxt = "";

if(o == null){
alert("domNode is null!");
return;
}

var _codetxt = "";

if(typeof(o)=="object"){
  switch(o.tagName){
   case "TEXTAREA":
   case "INPUT":
    _codetxt = o.value;
    break;
   case "DIV":
   case "SPAN":
    _codetxt = o.innerText;
    break;
   default:
    _codetxt = o.innerHTML;
    break;
  }
}else{
  _codetxt = o;
}

var _syn = new CLASS_HIGHLIGHT(_codetxt,syntax);

htmltxt = _syn.highlight();

return htmltxt;
}
</script>

function goit(stx){
var code = document.getElementById("m").innerText;
var xx = new CLASS_HIGHLIGHT(code,stx);
document.getElementById("highlight").innerHTML = xx.highlight();
}
</script>