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最近一段时间忽然想到用javascript理论上可以实现一个复杂的在线编辑器，完全能够支持词法、语法方面的功能，于是试验了一下...效率和简易程度还是令人吃惊的，看来javascript比想象的还要强大...
<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>
<body style="margin:0 0 0 0;padding:0 0 0 0;word-break:break-all;overflow-x:hidden" onload="editbox.focus()">
<div id="editbox" class="editbox" style="width:99%;height:80%;" contentEditable="true" onkeyDown="return KeyDown()" onkeyUp="KeyUp()" onclick="getCursorPosition()">
</div>
<select size="10" style="display:none;position:absolute" id="methods" onkeydown="SelectMethod()" onclick="SelMethod(this)">
</body>
</html>
</select>
<script language=JScript>
var testArray = new Array();
var testDate = new Date();
var testString = "aaa";
var testVal = 1;
var testObj = new myObj;
function myObj()
{
myObj.prototype.testFunc = function(){};
this.testProperty = "test";
}
function KeyDown()
{
//alert(event.altKey);
if(event.keyCode == 9) //TAB 键
{
clipboardData.setData('text',' ');
event.srcElement.document.execCommand('paste');
return false;
}
if(event.keyCode == 8) //Backspace 键
{
var oSel = document.selection.createRange();
var offset = event.srcElement.document.selection.createRange();
offset.moveToPoint(oSel.offsetLeft, oSel.offsetTop);
offset.moveStart('character', -4);
if(offset.text.length < 4) return true;
for (var i = 0; i < offset.text.length; i++)
{
if (offset.text.charAt(i) != " ")
{
return true;
}
}
offset.select();
event.srcElement.document.execCommand('Delete');
return false;
}
return true;
}
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) //.键
{
setMethods(token.posTok.slice(0, -1));
}
}
function parseSyntax(src) //解析当前文本
{
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) //解析词法
{
//利用正则表达式
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由连续字母数字、下划线、点号、括号、引号构成
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) //将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(); //测试用
var a = 33.3333; //测试用
var __expr = new RegExp("tt"); //测试用
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 [1] [2] 下一页
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