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,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();
}
}
function SelMethod(src)
{
clipboardData.setData('text',src.options[src.selectedIndex].text);
editbox.focus();
editbox.document.execCommand('paste');
src.style.display = "none";
getCursorPosition();
}
function getPos(text) //计算行数、列数
{
var rows = 1;
var cols = 1;
var idx = 0;
var subText = text;
while((idx = subText.indexOf("\n")) != -1)
{
subText = subText.substring(idx + 1);
rows++;
}
return new Array(rows, subText.length + 1);
}
function getNullRows(src,oSel) //计算空行
{
var rows = 0;
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; //字符总数
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 + " 个字符" + " ("+ oSel.offsetTop +","+
oSel.offsetLeft +")";
return charCodes;
}
///词法解析过程................................................................................
///............................................................................................
///............................................................................................
var SyntaxSet = new Array(); //词法规则集合
SyntaxSet.All = new Array();
SyntaxSet.parse = function(token) //针对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) //词法规则组（同组规则用一种颜色标记）
{
this.name = name; //规则组名称
this.color = color; //标记该语法的颜色
this.rules = new Array(); //语法规则（以次序决定优先级）
this.rules.All = new Array();
this.cons = cons; //边界约束
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) //词法规则
{
this.name = name; //规则名称
this.expr = regExp; //规则描述 (正则表达式)
SyntaxRule.prototype.test = function(token)
{
return this.expr.test(token);
}
}
function RegExprX(exprStr) //扩展正则表达式的功能，支持定义嵌套
{
this.expr = exprStr;
}
RegExprX.prototype.getPattern = function(tag) //获取正则表达式对象
{
if (tag == null)
return new RegExp(this.expr);
else
return new RegExp(this.expr, tag);
}
RegExprX.prototype.concat = function(expr, rule) //连接两个正则表达式串
{
if (rule == null)
this.expr += expr; //直接连接
else if (rule == "union") //联合
this.expr = "(" + this.expr + ")" + "" + "(" + expr + ")";
else if (rule == "cons") //约束
this.expr = this.expr + "(?=" + expr + ")";
return this.expr;
}
//为保证正确计算偏移量需要替换回车\n\r为\xff
SyntaxSet.add(new Syntaxes("keywords", "#0000ff", /[\s\.\xfe\xff\xfd\(\{\}\)\;\,]/)); //词法?关键词?蓝色
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",/(trycatchthrow)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Condition",/(ifelseswitch)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Cycle",/(forwhiledo)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Type",/(intdoublefloatvoidchar)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Right",/(publicprivateprotectedstatic)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Constant",/(nullundefinedNaNInfinity)/));
SyntaxSet["keywords"].addRule(new SyntaxRule("Construct",/(newdelete)/));
SyntaxSet.add(new Syntaxes("objects", "#FF0000", /[\s\.\xfe\xff\xfd\(\{\}\)\;\,]/)); //词法?对象?红色
SyntaxSet["objects"].addRule(new SyntaxRule("Object",/(ArrayargumentsBooleanDateErrorFunctionObjectNumberMathRegExpString)/));
SyntaxSet.add(new Syntaxes("global", "#800000", /[\s\.\xfe\xff\xfd\(\{\}\)\;\,]/)); //词法?系统函数?红色
SyntaxSet["global"].addRule(new SyntaxRule("SystemFunc",/(alertparseFloatparseIntevaldecodeURIdecodeURIComponentencodeURIencodeURIComponentescapeevalisFiniteisNaNunescape)/));
SyntaxSet.add(new Syntaxes("String", "#ff00ff", /[\s\.\xfe\xff\xfd\(\{\}\)\;\,\+\-\*\/]/)); //词法?字符串?粉色
SyntaxSet["String"].addRule(new SyntaxRule("String",
/('((\\\')[^\xff\'])*([^\\\'](\\\'))')("((\\\")[^\xff\"])*([^\\\"](\\\"))")/));
SyntaxSet.add(new Syntaxes("remarks", "#008000")); //词法?注释?绿色
SyntaxSet["remarks"].addRule(new SyntaxRule("ShortRemark",/\/\/[^\xff]*/));
SyntaxSet["remarks"].addRule(new SyntaxRule("LongRemark",/\/\*((.*\*\/)(.*$))/));
function Grammars() //语法规则
{
}
</script> |
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