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JS代码的格式化和压缩

摘要: JS代码的格式化和压缩
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曾经为看别人写的杂乱代码而头痛吗?曾经为看BWindow代码而烦恼吗?曾经为减小JS体积和JS的可读性之间的矛盾而左右徘徊吗?最好的办法是有个代码格式化和代码压缩的程序,今天总算有了,它是纯JS编写的,当然也就是开源的了.由于写的仓促,还有些小BUG,请经常注意更新!

运行代码框

<textarea class=fm id=code style="WIDTH: 519px; HEIGHT: 174px" rows=12 cols=82><head>Format </head> <body> <script language=JavaScript> /**//**//**//** ** ================================================================================================== ** 类名:CLASS_FORMATER ** 功能:JS格式化 ** 示例: --------------------------------------------------------------------------------------------------- var xx = new CLASS_FORMATER(code); document.getElementById("display").innerHTML = xx.format(); --------------------------------------------------------------------------------------------------- ** 作者:ttyp ** 邮件:ttyp@21cn.com ** 日期:2006-5-21 ** 版本:0.1 ** ================================================================================================== **/ function CLASS_FORMAT(code){ //哈希表类 function Hashtable(){ this._hash = new Object(); this.add = function(key,value){ if(typeof(key)!="undefined"){ if(this.contains(key)==false){ this._hash[key]=typeof(value)=="undefined"?null:value; return true; } else { return false; } } else { return false; } } this.remove = function(key){delete this._hash[key];} this.count = function(){var i=0;for(var k in this._hash){i++;} return i;} this.items = function(key){return this._hash[key];} this.contains = function(key){return typeof(this._hash[key])!="undefined";} this.clear = function(){for(var k in this._hash){delete this._hash[k];}} } 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 = ""; } this._deleteComment = false; //是否大小写敏感 this._caseSensitive = true; //可以后面加块语句的关键字 this._blockElement = this.str2hashtable("switch,if,while,try,finally"); //是函数申明 this._function = this.str2hashtable("function"); //本行括号内分号不做换行 this._isFor = "for"; this._choiceElement = this.str2hashtable("else,catch"); this._beginBlock = "{"; this._endBlock = "}"; this._singleEyeElement = this.str2hashtable("var,new,return,else,delete,in,case"); //得到分割字符 this._wordDelimiters= "  ,.?!;:\\/<>(){}[]\"'\r\n\t=+-|*%@#$^&"; //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 = "*/"; //行结束词 this._rowEnd = ";"; this._in = "in"; this.isCompress = false; this.style = 0; this._tabNum = 0; this.format = function() { var codeArr = new Array(); var word_index = 0; var htmlTxt = new Array(); if(this.isCompress){ this._deleteComment = true; } //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 function_opened = false; var bracket_open = false; var for_open = false; //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; } else if(codeArr[i]==" "||codeArr[i]=="\t"){ if(slash_slash_comment_opened||slash_star_comment_opened){ if(!this._deleteComment){ htmlTxt[htmlTxt.length] = codeArr[i]; } } if(quote_opened){ htmlTxt[htmlTxt.length] = codeArr[i]; } } else if(codeArr[i]=="\n"){ //处理换行 } else if (codeArr[i] == "\r"){ slash_slash_comment_opened = false; quote_opened = false; line_num++; if(!this.isCompress){ htmlTxt[htmlTxt.length] = "\r\n"+ this.getIdent(); } //处理function里的参数标记 } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&this.isFunction(codeArr[i])){ htmlTxt[htmlTxt.length] = codeArr[i] + " "; function_opened = true; } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._isFor){ htmlTxt[htmlTxt.length] = codeArr[i]; for_open = true; } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]=="("){ bracket_open = true; htmlTxt[htmlTxt.length] = codeArr[i]; } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==")"){ bracket_open = false; htmlTxt[htmlTxt.length] = codeArr[i]; } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._rowEnd){ if(!this.isCompress){ if(!for_open){ if(i=32&&codeArr[i+1].charCodeAt(0)<=127){ htmlTxt[htmlTxt.length] = codeArr[i+1].substr(0,1); htmlTxt[htmlTxt.length] = codeArr[i+1].substr(1); i=i+1; } } //处理多行注释的开始 } else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._commentOn,codeArr,i)){ slash_star_comment_opened = true; if(!this._deleteComment){ htmlTxt[htmlTxt.length] = this._commentOn; } i = i + this.getSkipLength(this._commentOn); //处理单行注释 } else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._lineComment,codeArr,i)){ slash_slash_comment_opened = true; if(!this._deleteComment){ htmlTxt[htmlTxt.length] = this._lineComment; } i = i + this.getSkipLength(this._lineComment); //处理忽略词 } else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._ignore,codeArr,i)){ slash_slash_comment_opened = true; htmlTxt[htmlTxt.length] = this._ignore; i = i + this.getSkipLength(this._ignore); //处理多行注释结束 } else if (!quote_opened&&!slash_slash_comment_opened&&this.isStartWith(this._commentOff,codeArr,i)){ if (slash_star_comment_opened) { slash_star_comment_opened = false; if(!this._deleteComment){ htmlTxt[htmlTxt.length] = this._commentOff; } i = i + this.getSkipLength(this._commentOff); } } else { //不是在字符串中 if(!quote_opened){ //如果不是在注释重 if(!slash_slash_comment_opened && !slash_star_comment_opened){ htmlTxt[htmlTxt.length] = codeArr[i]; //注释中 }else{ if(!this._deleteComment){ htmlTxt[htmlTxt.length] = codeArr[i]; } } }else{ htmlTxt[htmlTxt.length] = codeArr[i]; } } } return htmlTxt.join(""); } this.isStartWith = function(str,code,index){ if(typeof(str)!="undefined"&&str.length>0){ var cc = new Array(); for(var i=index;i=code[index].length&&c.indexOf(str)==0){ return true; } }else{ if(str.length>=code[index].length&&c.toLowerCase().indexOf(str.toLowerCase())==0){ return true; } } return false; } else { return false; } } this.isFunction = function(val){ return this._function.contains(this._caseSensitive?val:val.toLowerCase()); } this.isBlockElement = function(val) { return this._blockElement.contains(this._caseSensitive?val:val.toLowerCase()); } this.isChoiceElement = function(val) { return this._choiceElement.contains(this._caseSensitive?val:val.toLowerCase()); } this.isSingleEyeElement = function(val) { return this._singleEyeElement.contains(this._caseSensitive?val:val.toLowerCase()); } this.isNextElement = function(from,word){ for(var i=from;i=0){ count++; } } if(count>0){ count=count-1; } return count; } this.getIdent=function(){ var n = []; for(var i=0;i<this._tabNum;i++){ n[n.length] = "\t"; } return n.join(""); } } function doformat(o){ 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_FORMAT(_codetxt); htmltxt = _syn.format(); return htmltxt; } function go() { var code = document.getElementById("code").value; var xx = new CLASS_FORMAT(code); var a = new Date(); if(document.getElementById('cboOperate').selectedIndex==1){ xx.isCompress=true; }else{ xx.style = parseInt(document.getElementById('cboStyle').value); } document.getElementById("display").value = xx.format(); alert("共花:" + (new Date().getTime()-a.getTime()) + "ms"); } // </script> <textarea id=code rows=12 cols=100> /* 这个是一个类 */ function xx (num,str){//说明 var a = num;this.aa = a; this.bb = function(){alert(str);} this.cc = function(){for(var i=0;i<10;i++){document.title=i;}}}; xx.prototype.dd= function(){alert("d d kd");} var a = new xx(100,"hello"),b=new xx(0,"ttyp"); if(1>2) { alert(); } else { alert(" hell "); } a.bb(); b.dd(); alert(a.aa); </textarea>
<select id="cboOperate" onchange="if(this.selectedIndex==1)document.getElementById('cboStyle').disabled=true;else document.getElementById('cboStyle').disabled=false;"> <option value="0">格式化</option> <option value="1">压缩</option> </select> <select id="cboStyle"> <option value="0">经典</option> <option value="1">微软</option> </select> <input onclick=go() type=button value=go>
<textarea id=display rows=12 cols=100> </textarea> </body></textarea>

<input style="CURSOR: hand" onfocus=this.blur() onclick="runEx('code')" type=button value=运行代码> <input style="WIDTH: 95px; CURSOR: hand" onfocus=this.blur() onclick=cycode(code) type=button value=复制到剪贴板 name=Submit> <input style="CURSOR: hand" onfocus=this.blur() onclick=svcode(code) type=button value=另存代码> [Ctrl+A 全部选择 提示:你可先修改部分代码,再按运行]

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