javascript實現(xiàn)語法分色編輯器

duduwolf 2005-07-17

展開全文

最近一段時間忽然想到用javascript理論上可以實現(xiàn)一個復(fù)雜的在線編輯器，完全能夠支持詞法、語法方面的功能，于是試驗了一下...效率和簡易程度還是令人吃驚的，看來javascript比想象的還要強大...

<html>
<head>
  <title>Silverna Demo Ver 0.01</title>
  <style>
   div.editbox{
    margin:0 0 0 0;
    padding:0 0 0 0;
    font:16/18px Arial;
    border:0px solid #000000;
   }
   p{
    margin:0 0 0 0;
    padding:0 0 0 0;
   }
  </style>
</head>

</select>
<script language=JScript>
var testArray = new Array();
var testDate = new Date();
var testString = "aaa";
var testVal = 1;
var testObj = new myObj;

function KeyUp()
{
var oSel, offset;
if(event.keyCode == 13)
{
  testStr = event.srcElement.innerText.substring(0, getCursorPosition());
  //alert(testStr);
  var space = "";
  for (var i = testStr.length - 1; i >= 0; i--)
  {
   //alert(testStr.length+":"+testStr.charAt(i) + ":" + space.length);
   if (testStr.charAt(i) == "\n") break;
   if (testStr.charAt(i) == " ")
    space += " ";
   else
    space = "";
  }
  //alert(testStr);
  clipboardData.setData(‘text‘,space);
  event.srcElement.document.execCommand(‘paste‘);
}
oSel = document.selection.createRange();
var left = oSel.offsetLeft;
var top = oSel.offsetTop;
    var token = getCurrentToken(event.srcElement);
var chars = getCursorPosition();

parseSyntax(event.srcElement);
offset = event.srcElement.document.selection.createRange();
offset.moveToPoint(left, top);
offset.select();

if(event.keyCode == 190) //.鍵
{
setMethods(token.posTok.slice(0, -1));
}
}

function parseSyntax(src) //解析當(dāng)前文本
{
var text = src.innerHTML;
text = text.replace(/<FONT[^<>]*>/gi, "").replace(/<\/FONT[^<>]*>/gi,"");
text = text.replace(/<P>/gi, "\xfe").replace(/<\/P>/gi, "\xff");
text = text.replace(/\ /gi, "\xfd");
text = text.replace(/\r\n/gi,"");

for (var i = 0; i <SyntaxSet.All.length; i++)
{
  var syntaxes = SyntaxSet.All[i];
  for (var j = 0; j < syntaxes.rules.All.length; j++)
  {
   syntaxes.rules.All[j].color = syntaxes.color;
   syntaxes.rules.All[j].cons = syntaxes.cons;

text = parseRule(text, syntaxes.rules.All[j]);
}
}

src.innerHTML = text.replace(/\xfc/g,"‘").replace(/\xfe/g,"<P>").replace(/\xff/g,"</P>").replace(/\xfd/g," ");
}
function parseRule(text, rule) //解析詞法
{
//利用正則表達式
var newText = "";

var idx = text.search(rule.expr);

while (idx != -1)
{
  var remark = text.match(rule.expr);
  //alert(text.substring(0, idx+remark[0].length));
  var subText = text.substring(0, idx + remark[0].length);

  if(rule.cons == null || (idx == 0 || rule.cons.test(text.charAt(idx-1))) && (idx + remark[0].length >= text.length || rule.cons.test(text.charAt(idx + remark[0].length))))
  {
   //alert(remark[0]);
   //alert(remark[0].replace(/<FONT[^<>]*>/gi, "").replace(/<\/FONT[^<>]*>/gi,""));
   subText = subText.replace(remark[0], "<FONT color=\xfc"+rule.color+"\xfc>" + remark[0].replace(/<FONT[^<>]*>/gi, "").replace(/<\/FONT[^<>]*>/gi,"") + "</FONT>");
   //alert(subText);
  }
  newText += subText;
  text = text.substring(idx + remark[0].length);
  idx = text.search(rule.expr);
}
newText += text;
return newText;
}

function getCurrentToken(src)
{
var oSel = document.selection.createRange();
var offset = src.document.selection.createRange();
offset.moveToPoint(oSel.offsetLeft, oSel.offsetTop);
offset.moveStart("character", -99999);

var tokens = offset.text.split(/[\s\+\-\*\/]/); //token由連續(xù)字母數(shù)字、下劃線、點號、括號、引號構(gòu)成
var currentToken = tokens[tokens.length - 1];

var idx = offset.text.length;

var fullToken = src.innerText.substring(idx);
fullToken = fullToken.replace(/[\s\+\-\*\/]/,"@@@@");

idx = fullToken.indexOf("@@@@");
if(idx != -1)
fullToken = fullToken.substring(0, idx);

var token = new Array();

token.currentToken = currentToken + fullToken;
token.posTok = currentToken;

return token;
}
Array.prototype.pushDistinct = function(obj)
{
for (var i = 0; i < this.length; i++)
{
  if (this[i] == obj)
  {
   return null;
  }
}
this.push(obj);
return obj;
}

function putMethods(methodList, obj, methods) //將方法添加到方法列表
{
var list = methods.split(",");

for (var i = 0; i < list.length; i++)
{
  if (obj[list[i]] != null)
  {
   methodList.pushDistinct(list[i]);
  }
}
}
var now = new Date(); //測試用
var a = 33.3333; //測試用
var __expr = new RegExp("tt"); //測試用
function setMethods(objStr)
{
  var oSel = document.selection.createRange();

  try
  {
   if (objStr == "alert") return;
   var methodList = new Array();
   var obj = eval(objStr);

   if (obj.prototype != null)
   {
    methodList.pushDistinct("prototype");
   }
   if (obj != null)
   {

    //基本Object方法
    putMethods(methodList, obj,"constructor,hasOwnProperty,isPrototypeOf,propertyIsEnumerable,toLocaleString,toString,valueOf");

    //基本Array方法
    putMethods(methodList, obj,"concat,join,length,pop,push,reverse,shift,slice,sort,splice,unshift");

//基本Date方法
putMethods(methodList,obj,"getDate,getUTCDate,getDay,getUTCDay,getFullYear,getUTCFullYear,getHours,getUTCHours,getMilliseconds,getUTCMilliseconds,getMinutes,getUTCMinutes,getMonth,getUTCMonth,getSeconds,getUTCSeconds,getTime,getTimezoneoffset,getYear");

putMethods(methodList,obj,"setDate,setUTCDate,setFullYear,setUTCFullYear,setHours,setUTCHours,setMilliseconds,setUTCMilliseconds,setMinutes,setUTCMinutes,setMonth,setUTCMonth,setSeconds,setUTCSeconds,setTime,setYear,toDateString,toGMTString,toLocaleDateString,toLocaleTimeString,toString,toTimeString,toUTCString,valueOf,parse,UTC");

    //基本Math方法
    putMethods(methodList,obj,"E,LN10,LN2,LOG10E,LOG2E,PI,SQRT1_2,SQRT2");
    putMethods(methodList,obj,"abs,acos,asin,atan,atan2,ceil,cos,exp,floor,log,max,min,pow,random,round,sin,sqrt,tan");

    //基本Function方法
    putMethods(methodList,obj,"arguments,caller,length,prototype,apply,call,toString");

    //基本Number方法
    putMethods(methodList,obj,"MAX_VALUE,MIN_VALUE,NaN,NEGATIVE_INFINITY,POSITIVE_INFINITY");
    putMethods(methodList,obj,"toString,toLocalString,toFixed,toExponential,toPrecision");

//基本RegExp方法
putMethods(methodList,obj,"global,ignoreCase,lastIndex,multiline,source,exec,test");

    //基本String方法
    putMethods(methodList,obj,"charAt,charCodeAt,contact,indexOf,lastIndexOf,match,replace,search,slice,split,substring,substr,toLowerCase,toString,toUpperCase,valueOf,fromCharCode");
    putMethods(methodList,obj,"anchor,big,blink,bold,fixed,fontcolor,fontsize,italics,link,small,strike,sub,sup");

   }
   for (each in obj)
   {
    methodList.pushDistinct(each);
   }
   methodList.sort();

   if (methodList.length > 0)
   {
    methods.options.length = 0;
    for (var i = 0; i < methodList.length; i++)
    {
     methods.options.add(new Option(methodList[i]));
    }
    if (methods.options.length > 10)
    {
     methods.size = 10;
    }
    else
    {
     methods.size = methods.options.length;
    }
    methods.style.top = oSel.offsetTop;
    methods.style.left = oSel.offsetLeft;
    methods.style.display = "";
    methods.options[0].selected = true;
    methods.focus();
   }
  }
  catch(e){}
}

function SelectMethod()
{
var src = event.srcElement;
if(event.keyCode == 13)
{
SelMethod(src);
}

if(event.keyCode == 27 || event.keyCode == 8 || event.keyCode == 32)
{
src.style.display = "none";
editbox.focus();
}
}

var offsetEnd = src.document.selection.createRange();

var oldTop = 2;
var oldLeft = 2;

while(1)
{
offsetEnd.moveToPoint(oSel.offsetLeft, oSel.offsetTop);
offsetEnd.moveStart("character",-1-rows);

  if (offsetEnd.text.length > 0 || offsetEnd.offsetTop == oldTop && offsetEnd.offsetLeft == oldLeft)
  {
   break;
  }

  rows ++;
  oldTop = offsetEnd.offsetTop;
  oldLeft = offsetEnd.offsetLeft;
}

return rows;
}
function getCursorPosition()
{
var src = event.srcElement;
var offset = src.document.selection.createRange();
var oSel = document.selection.createRange();

var textLength = src.innerText.length;

offset.moveToPoint(oSel.offsetLeft, oSel.offsetTop);
offset.moveStart("character", -99999);
//src.document.execCommand("ForeColor",false,"#ff0000");
var rowSpans = offset.getClientRects();

var pos = getPos(offset.text);

var charCodes = offset.text.length; //字符總數(shù)
var chars = offset.text.replace(/\r\n/g,"").length + 1; //字符

var extRows = getNullRows(src,oSel);
if(extRows > 0)
{
pos[0] += extRows;
pos[1] = 1;
}
window.status = "行: " + pos[0] +", 列: " + pos[1] + ", 第 " + chars + " 個字符" + " ("+ oSel.offsetTop +","+
oSel.offsetLeft +")";
return charCodes;
}

///詞法解析過程................................................................................
///............................................................................................
///............................................................................................

var SyntaxSet = new Array(); //詞法規(guī)則集合
SyntaxSet.All = new Array();

SyntaxSet.parse = function(token)   //針對token返回rule
{
for (var i = 0; i < this.All.length; i++)
{
  var syntaxes = this.All[i];
  for (var j = 0; j < syntaxes.rules.All.length; j++)
  {
   if (syntaxes.rules.All[j].test(token))
   {
    syntaxes.rules.All[j].color = syntaxes.color;
    return syntaxes.rules.All[j];
   }
  }
}

return null;
}

SyntaxSet.add = function(syntaxes)
{
if(this[syntaxes.name] != null)
return;
this[syntaxes.name] = syntaxes;
this.All.push(syntaxes);
}

function Syntaxes(name, color, cons) //詞法規(guī)則組（同組規(guī)則用一種顏色標(biāo)記）
{
this.name = name; //規(guī)則組名稱
this.color = color; //標(biāo)記該語法的顏色
this.rules = new Array(); //語法規(guī)則（以次序決定優(yōu)先級）
this.rules.All = new Array();
this.cons = cons; //邊界約束

Syntaxes.prototype.addRule = function(rule)
{
  if(this.rules[rule.name] != null)
   return;
  this.rules[rule.name] = rule;
  this.rules.All.push(rule);
}
}

function SyntaxRule(name, regExp) //詞法規(guī)則
{
this.name = name;    //規(guī)則名稱
    this.expr = regExp; //規(guī)則描述 (正則表達式)
SyntaxRule.prototype.test = function(token)
{
  return this.expr.test(token);
}
}

//為保證正確計算偏移量需要替換回車\n\r為\xff
SyntaxSet.add(new Syntaxes("keywords", "#0000ff", /[\s\.\xfe\xff\xfd$\{\}$\;\,]/)); //詞法?關(guān)鍵詞?藍色
SyntaxSet["keywords"].addRule(new SyntaxRule("Function",/function/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Variable",/var/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Return",/return/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Exception",/(try|catch|throw)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Condition",/(if|else|switch)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Cycle",/(for|while|do)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Type",/(int|double|float|void|char)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Right",/(public|private|protected|static)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Constant",/(null|undefined|NaN|Infinity)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Construct",/(new|delete)/));

SyntaxSet.add(new Syntaxes("objects", "#FF0000", /[\s\.\xfe\xff\xfd$\{\}$\;\,]/)); //詞法?對象?紅色
SyntaxSet["objects"].addRule(new SyntaxRule("Object",/(Array|arguments|Boolean|Date|Error|Function|Object|Number|Math|RegExp|String)/));

SyntaxSet.add(new Syntaxes("global", "#800000", /[\s\.\xfe\xff\xfd$\{\}$\;\,]/)); //詞法?系統(tǒng)函數(shù)?紅色
SyntaxSet["global"].addRule(new SyntaxRule("SystemFunc",/(alert|parseFloat|parseInt|eval|decodeURI|decodeURIComponent|encodeURI|encodeURIComponent|escape|eval|isFinite|isNaN|unescape)/));

SyntaxSet.add(new Syntaxes("String", "#ff00ff", /[\s\.\xfe\xff\xfd$\{\}$\;\,\+\-\*\/]/)); //詞法?字符串?粉色
SyntaxSet["String"].addRule(new SyntaxRule("String",
/(‘((\\\‘)|[^\xff\‘])*([^\\\‘]|(\\\‘))‘)|("((\\\")|[^\xff\"])*([^\\\"]|(\\\"))")/));

SyntaxSet.add(new Syntaxes("remarks", "#008000")); //詞法?注釋?綠色
SyntaxSet["remarks"].addRule(new SyntaxRule("ShortRemark",/\/\/[^\xff]*/));
SyntaxSet["remarks"].addRule(new SyntaxRule("LongRemark",/\/\*((.*\*\/)|(.*$))/));

function Grammars() //語法規(guī)則
{
}
</script>