var supported=(document.all||document.getElementById);var disabled=false;var charmapid=1;var keymodeid=0;var linebreak=0;var theTyper=null;reset=function(){}
initTyper=telexingVietUC;function setTypingMode(mode){keymodeid=mode;if(theTyper)theTyper.keymode=initKeys();if(!supported&&!disabled){alert("Xin loi, trinh duyet web cua ban khong cho phep dung VietTyping.\n");disabled=true;}}
initCharMap=function(){return new CVietUniCodeMap();}
initKeys=function(){switch(keymodeid){case 1:return new CTelexKeys();case 2:return new CVniKeys();case 3:return new CViqrKeys();case 4:return new CAllKeys();default:return new CVKOff();}}
function telexingVietUC(txtarea){txtarea.vietarea=true;txtarea.onkeyup=null;if(!supported)return;txtarea.onkeypress=vietTyping;txtarea.getCurrentWord=getCurrentWord;txtarea.replaceWord=replaceWord;txtarea.onkeydown=onKeyDown;txtarea.onmousedown=onMouseDown;if(!theTyper)theTyper=new CVietString("");}
function getEvt(evt){if(typeof(evt)=='string')return evt.charCodeAt(0);return document.all?event.keyCode:(evt&&evt.which)?evt.which:0;}
function onKeyDown(evt){var c=getEvt(evt);if((c==10)||(c==13)){reset(1);linebreak=1;}
else if((c<49)&&(c!=16)&&(c!=20)){linebreak=0;reset(c==32);}
return true;}
function onMouseDown(evt){reset(0);linebreak=0;return true;}
function vietTyping(evt){var c=getEvt(evt);theTyper.value=this.getCurrentWord();var changed=((c>32)&&theTyper.typing(c));if(changed)this.replaceWord(theTyper.value);return!changed;}
function getCurrentWord(){if(!document.all)return this.value;var caret=this.document.selection.createRange();if(caret.text)return null;var backward=-10;do{var caret2=caret.duplicate();caret2.moveStart("character",backward++);}while(caret2.parentElement()!=this&&backward<0);this.curword=caret2.duplicate();return caret2.text;}
function replaceWord(newword){if(!document.all){this.value=newword;return;}
this.curword.text=newword;this.curword.collapse(false);}
function CVietString(str){this.value=str;this.keymode=initKeys();this.charmap=initCharMap();this.ctrlchar='-';this.changed=0;this.typing=typing;this.Compose=Compose;this.Correct=Correct;this.findCharToChange=findCharToChange;return this;}
function typing(ctrl){this.changed=0;this.ctrlchar=String.fromCharCode(ctrl);if(linebreak)linebreak=0;else this.keymode.getAction(this);this.Correct();return this.changed;}
function Compose(type){if(!this.value)return;var info=this.findCharToChange(type);if(!info||!info[0])return;var telex;if(info[0]=='\\')telex=[1,this.ctrlchar,1];else if(type>6)telex=this.charmap.getAEOWD(info[0],type,info[3]);else telex=this.charmap.getDau(info[0],type);if(!(this.changed=telex[0]))return;this.value=this.value.replaceAt(info[1],telex[1],info[2]);if(!telex[2]){spellerror=1;this.value+=this.ctrlchar;}}
function Correct(){if(this.charmap.maxchrlen||!document.all)return 0;var tmp=this.value;if('nNcC'.indexOf(this.ctrlchar)>=0)tmp+=this.ctrlchar;var er=/[^\x01-\x7f](hn|hc|gn)$/i.exec(tmp);if(er){this.value=tmp.substring(0,tmp.length-2)+er[1].charAt(1)+er[1].charAt(0);this.changed=1;}
else if(!this.changed)return 0;er=/\w([^\x01-\x7f])(\w*)([^\x01-\x7f])\S*$/.exec(this.value);if(!er)return 0;var i=this.charmap.isVowel(er[1]);var ri=(i-1)%24+1,ci=(i-ri)/24;var i2=this.charmap.isVowel(er[3]);if(!ci||!i2)return 0;var ri2=(i2-1)%24+1,ci2=(i2-ri2)/24;var nc=this.charmap.charAt(ri)+er[2]+this.charmap.charAt(ci*24+ri2);this.value=this.value.replace(new RegExp(er[1]+er[2]+er[3],'g'),nc);}
function findCharToChange(type){var lastchars=this.charmap.lastCharsOf(this.value,5);var i=0,c=lastchars[0][0],chr=0;if(c=='\\')return[c,this.value.length-1,1];if(type==15)while(!(chr=this.charmap.isVD(c))){if((c<'A')||(i>=4)||!(c=lastchars[++i][0]))return null;}
else while("cghmnptCGHMNPT".indexOf(c)>=0){if((c<'A')||(i>=2)||!(c=lastchars[++i][0]))return null;}
c=lastchars[0][0].toLowerCase();var pc=lastchars[1][0].toLowerCase();var ppc=lastchars[2][0].toLowerCase();if(i==0&&type!=15){if((chr=this.charmap.isVowel(lastchars[1][0]))&&("uyoia".indexOf(c)>=0)&&!this.charmap.isUO(pc,c)&&!((pc=='o'&&c=='a')||(pc=='u'&&c=='y'))&&!((ppc=='q'&&pc=='u')||(ppc=='g'&&pc=='i')))++i;if(c=='a'&&(type==9||type==7))i=0;}
c=lastchars[i][0];if((i==0||chr==0)&&type!=15)chr=this.charmap.isVowel(c);if(!chr)return null;var clen=lastchars[i][1],isuo=0;if((i>0)&&(type==7||type==8||type==11)){isuo=this.charmap.isUO(lastchars[i+1][0],c);if(isuo){chr=isuo;clen+=lastchars[++i][1];isuo=1;}}
var pos=this.value.length;for(var j=0;j<=i;j++)pos-=lastchars[j][1];return[chr,pos,clen,isuo];}
function CVietCharMap(){this.vietchars=null;this.length=149;this.chr_cache=new Array(20);this.ind_cache=new Array(20);this.cptr=0;this.caching=function(chr,ind){this.chr_cache[this.cptr]=chr;this.ind_cache[this.cptr++]=ind;this.cptr%=20;}
return this;}
CVietCharMap.prototype.charAt=function(ind){var chrcode=this.vietchars[ind];return chrcode?String.fromCharCode(chrcode):null;}
CVietCharMap.prototype.isVowel=function(chr){var i=0;while((i<20)&&(chr!=this.chr_cache[i]))++i;if(i<20)return this.ind_cache[i];i=this.length-5;while((chr!=this.charAt(i))&&i)--i;this.caching(chr,i);return i;}
CVietCharMap.prototype.isVD=function(chr){var ind=this.length-5;while((chr!=this.charAt(ind))&&(ind<this.length))++ind;return(ind<this.length)?ind:0;}
CVietCharMap.prototype.isUO=function(c1,c2){if(!c1||!c2)return 0;var ind1=this.isVowel(c1);var ci=(ind1-1)%12;if((ci!=9)&&(ci!=10))return 0;var ind2=this.isVowel(c2);ci=(ind2-1)%12;if((ci!=6)&&(ci!=7)&&(ci!=8))return 0;return[ind1,ind2];}
CVietCharMap.prototype.getDau=function(ind,type){var accented=(ind<25)?0:1;var ind_i=(ind-1)%24+1;var charset=(type==6)?0:type;if((type==6)&&!accented)return[0];var newind=charset*24+ind_i;if(newind==ind)newind=ind_i;var chr=this.charAt(newind);if(!chr)chr=this.lowerCaseOf(0,newind);return[1,chr,newind>24||type==6];}
var map=[[7,7,7,8,8,8,9,10,11,15],[0,3,6,0,6,9,0,3,6,0],[1,4,7,2,8,10,1,4,7,1]];CVietCharMap.prototype.getAEOWD=function(ind,type,isuo){var c=0,i1=isuo?ind[0]:ind;var vc1=(type==15)?(i1-1)%2:(i1-1)%12;if(isuo){var base=ind[1]-(ind[1]-1)%12;if(type==7||type==11)c=this.charAt(i1-vc1+9)+this.charAt(base+7);else if(type==8)c=this.charAt(i1-vc1+10)+this.charAt(base+8);return[c!=0,c,1];}
var i=-1,shift=0,del=0;while(shift==0&&++i<map[0].length){if(map[0][i]==type){if(map[1][i]==vc1)shift=map[2][i]-vc1;else if(map[2][i]==vc1)shift=map[1][i]-vc1;}}
if(shift==0){if(type==7&&(vc1==2||vc1==8))shift=-1;else if((type==9&&vc1==2)||(type==11&&vc1==8))shift=-1;else if(type==8&&(vc1==1||vc1==7))shift=1;del=1;}else del=(shift>0);i1+=shift;var chr=this.charAt(i1);if(i1<145)this.caching(chr,i1);if(!chr)chr=this.lowerCaseOf(0,i1);return[shift!=0,chr,del];}
CVietCharMap.prototype.lastCharsOf=function(str,num){if(!num)return[str.charAt(str.length-1),1];var vchars=new Array(num);for(var i=0;i<num;i++){vchars[i]=[str.charAt(str.length-i-1),1];}
return vchars;}
String.prototype.replaceAt=function(i,newchr,clen){return this.substring(0,i)+newchr+this.substring(i+clen);}
function CVietUniCodeMap(){var map=new CVietCharMap();map.vietchars=new Array("UNICODE",97,226,259,101,234,105,111,244,417,117,432,121,65,194,258,69,202,73,79,212,416,85,431,89,225,7845,7855,233,7871,237,243,7889,7899,250,7913,253,193,7844,7854,201,7870,205,211,7888,7898,218,7912,221,224,7847,7857,232,7873,236,242,7891,7901,249,7915,7923,192,7846,7856,200,7872,204,210,7890,7900,217,7914,7922,7841,7853,7863,7865,7879,7883,7885,7897,7907,7909,7921,7925,7840,7852,7862,7864,7878,7882,7884,7896,7906,7908,7920,7924,7843,7849,7859,7867,7875,7881,7887,7893,7903,7911,7917,7927,7842,7848,7858,7866,7874,7880,7886,7892,7902,7910,7916,7926,227,7851,7861,7869,7877,297,245,7895,7905,361,7919,7929,195,7850,7860,7868,7876,296,213,7894,7904,360,7918,7928,100,273,68,272);return map;}
function CVietKeys(){this.getAction=function(typer){var i=this.keys.indexOf(typer.ctrlchar.toLowerCase());if(i>=0)typer.Compose(this.actions[i]);}
return this;}
function CVKOff(){this.off=true;this.getAction=function(){};return this;}
function CTelexKeys(){var k=new CVietKeys();k.keys="sfjrxzaeowd";k.actions=[1,2,3,4,5,6,9,10,11,8,15];k.istelex=true;return k;}
function CVniKeys(){var k=new CVietKeys();k.keys="0123456789";k.actions=[6,1,2,4,5,3,7,8,8,15];return k;}
function CViqrKeys(){var k=new CVietKeys();k.keys="\xB4/'\u2019`.?~-^(*+d";k.actions=[1,1,1,1,2,3,4,5,6,7,8,8,8,15];return k;}
function CAllKeys(){var k=new CVietKeys();k.keys="sfjrxzaeowd0123456789\xB4/'`.?~-^(*+d";k.actions=[1,2,3,4,5,6,9,10,11,8,15,6,1,2,4,5,3,7,8,8,15,1,1,1,2,3,4,5,6,7,8,8,8,15];k.istelex=true;return k;}