JavaScript - Ayuda con XSearch Engine version5.2

/* XSearch Engine version5.2      */

/* developed by P.Bestebroer      */

/* http://www.dynamic-core.net       */

function trecords(){

   this.index=(trecords.count++)

   this.link=''

   this.keywords=''

   this.description=''

   return this

}

trecords.prototype.set=function(link,keywords,description) {

   this.link=link

   this.keywords=keywords

   this.description=description

}

trecords.prototype.searchstring=function() { return this.link+' '+this.keywords+' '+this.description }

trecords.prototype.count=0

function add(link,keywords,description) {

   al=records.length

   records[al]=new trecords()

   records[al].set(link,keywords,description)

}

records = new Array()

finds=0

sites=0

version=""

andresult=false

SortResults=true

display_start=0

displast=5

function qsort(f, l){

// not used anymore, causes stack-overflow in large database 

// Qsort function by Rob B. 

   var a=f

   var b=l

   var s

   var m = results[(a+b)>>1].val

      while (a<=b) {

      while (results[a].val>m) {a++}

      while (m>results[b].val) {b--}

      if (a<=b) {

                  s=results[a]

         results[a]=results[b]

         results[b]=s

               a++

               b--

           }

   }

   if (f<b) this.qsort(f, b)

   if (a<l) this.qsort(a, l)

}

function bsort() {

   for (var i=results.length-1; i>=0; i--) {

      for (var j=i; j>=0; j--) {

         if (results[i].val>results[j].val) {

            s=results[i]

            results[i]=results[j]

            results[j]=s

         }

      }

   }

}

function searchAll(keyword){

   var timeA=new Date()

   var nw=0

   finds=0

   sites=0

   var x = parseIt(keyword)

   if(x == -1) return

   total_keywords=x

   document.open()

   document.clear()

   document.write('<link rel="stylesheet" href="xsearch.css">')

   AddBody()

   if (keyword.length>80) keyword=keyword.substring(0,80)+"..."

   results=new Array()

   for (q=0; q<records.length; q++) {

      results[q]=new Array()

      results[q].rec=q

      results[q].val=0

   }

   for (nw=0; nw<keywords.length; nw+=1) search(keywords[nw])

   if (andresult) {

      for (a=0; a<results.length; a+=1) {

         if (results[a].val>0) {

            if (results[a].val<=(total_keywords-1)<<1) {

               results[a].val=0

               sites-=1

            }

         }

      }

   }

   if (SortResults && keywords!='[all]') bsort()

   // Now we build the output page 

   displast=display_start

   displast+=5

   if (displast>sites) displast=sites

   var timeB=new Date()

   if (finds==0) { display_start=-1; displast=0 }

   document.write("<center><h3>Resultados <b><span class='azur'>"+(display_start+1)+"</span>-<span class='azur'>"+(displast)+"</span></b> de <b><span class='azur'>"+sites+"</span></b> para <b><span class='azur'>"+keyword+"</span>.</b>  Tiempo de búsqueda: <b><span class='azur'>"+((timeB-timeA)/1000)+"</span></b> segundos.</h3></center>")

   if (displast>sites && finds!=0) displast=sites+1

   if (finds==0) {

      document.write("<h3><font >No se encontró <b>''"+keyword+"''</b></font></h3>"+

                  "<p>La palabra - <b>"+keyword+"</b> - no se encuentra en la base de datos.</p>"+

                  "<LI>Verifique que haya deletreado bien la palabra.</li>"+

                  "<LI>Intente nuevamente utilizando otra palabra clave.</li>"+

                  "<LI>Pruebe ingresando varias palabras en un mismo campo.</li></span>"+

                  "</p>")

      DisplayXSearch()

      document.close()

      return

   }

   q2=display_start

   q3=displast

   for (q=display_start; q<q3; q+=1) {

      if (results[q].val>0) {

         rc=results[q].rec

         document.write("<span class='xtitle'>"+records[rc].link+"</span><br>")

         x1=records[rc].link.indexOf('http://')

         if (x1==-1) x1=records[rc].link.indexOf('href=')+5

         else x1+=7

         x2=records[rc].link.indexOf('>')-1

         if (x1>0 && x2>0) {

            tmp=records[rc].link.substring(x1,x2)

            x2=tmp.indexOf(' ')

            if (x2>0) tmp=tmp.substring(0,x2)

            if (tmp.substring(0,1)=="'") tmp=tmp.substring(1,tmp.length-2)

            if (tmp.substring(0,1)=='"') tmp=tmp.substring(1,tmp.length-1)

            document.write("<table border=0 width=800><tr><td><span class='xresult'>"+records[rc].description+"</span></td></tr></table><span class='xlocation'>"+tmp+"</span><br><br>")

         }

         q2++

         }

   }

   if (finds>5) {

      document.write("<BR>")

      pages=Math.round(finds/5)

      if (finds%10<6)   pages++

      // Create the parameter string 

      paramstring=searchname+"?keywords="+keyword+"&and="+andresult+"&sort="+SortResults

      document.write("<center><span class='xsmall'>")

      if (display_start>0) document.write("<a href='"+paramstring+"&disp="+(display_start-5)+"'>anterior</a>")

      document.write("   ")

      for (i=1; i<=pages; i+=1){

         if ((((i-1)*5)+1)<=sites) document.write("<a href='"+paramstring+"&disp="+(((i-1)*5))+"'>"+i+"</a>&nbsp&nbsp ")

      }

      document.write("   ")

      if (displast<=sites) document.write("<a href='"+paramstring+"&disp="+(displast)+"'>siguiente</a>")

      document.write("</span></center>")

   }

   DisplayXSearch()

   document.close()

}

function Cat() {

   document.open()

   document.clear()

   document.write('<link rel="stylesheet" href="xsearch.css">')

   AddBody()

   DisplayXSearch()

   document.close()

}

function stripInput(key) {

   while(key.substring(0,1) == ","  || key.substring(0,1) == " " ) key = key.substring(1,key.length)

   while(key.substring(key.length-1,key.length) == "," || key.substring(key.length-1,key.length) == " ") key = key.substring(0,key.length-1)

   return key

}

function parseIt(key) {

   key=stripInput(key)+" "

   var y=0

   while(key.indexOf(" ") > 0) {

      if (key.substring(0,1)=='"') {

         var pos=key.indexOf('"',2)

         keywords[y]=key.substring(1,pos)

         keywords[y]=stripInput(keywords[y])

         y++

         key=key.substring(pos+1,key.length)

      } else {

         var pos=key.indexOf(' AND ')

         if ((pos>0) && (key.indexOf(' ')>=pos)) {

            pos=key.indexOf(' ',pos+5)

            keywords[y]=key.substring(0,pos)

            keywords[y]=stripInput(keywords[y])

            y++

            key=key.substring(pos+1,key.length)

            if (key.substring(0,4)=='AND ') {

               pos=keywords[y-1].indexOf(' ')+5

               key=keywords[y-1].substring(pos,keywords[y-1].length)+' '+key

            }

         } else {

              var pos=key.indexOf(' OR ')

              if ((pos>0) && (key.indexOf(' ')>=pos))   {

               pos=key.indexOf(' ')

               keywords[y]=key.substring(0,pos)

               keywords[y]=stripInput(keywords[y])

               if (keywords[y]!=keywords[y-1])   y++

               key=key.substring(pos+1,key.length)

               pos=key.indexOf('OR ')

               key=key.substring(pos+3,key.length)

               pos=key.indexOf(' ')

               keywords[y]=key.substring(0,pos)

               keywords[y]=stripInput(keywords[y])

               y++

               key=key.substring(pos+1,key.length)

               if (key.substring(0,3)=='OR ') key=keywords[y-1]+' '+key

            } else {

               var pos = key.indexOf(" ")

               keywords[y]=key.substring(0,pos)

               keywords[y] = stripInput(keywords[y])

               y++

               if(y > 50) return -1

               key=key.substring(pos+1,key.length)

            }

         }

      }

   }

   return y-1

}

var keywords = new Array()

var results

function AddBody() {

   var keytext='"'+searchname+'?keywords="+'

   var andtext='"&and="+'

   document.write('<script>function doSearch(){'+

                  'searchwords=document.searchform.searchwords.value; '+

                  'while (searchwords.indexOf(" ")>-1){ pos=searchwords.indexOf(" ");'+

                  'searchwords=searchwords.substring(0,pos)+"+"+searchwords.substring(pos+1); }'+

                  'document.location='+keytext+' searchwords+'+andtext+'"0"}'+

                  '<'+'/'+'script>'

                  )

   templateBody()

   document.write("<form name='searchform' method='post' action='javascript:doSearch()'><table border='0' width='100%'><tr><td align='center'><font face='Arial, Helvetica, sans-serif' size='3'><input name='searchwords' type='text' size='30'>&nbsp;&nbsp;<a href='javascript:doSearch()'>"+ButtonCode+"</a></font></td></tr></table></form>")

   if (usebannercode) bannerCode()

}

function DisplayXSearch() {

   // This line can be removed, but please don't add anything like 

   // copyright by <your name here> because that's not allowed, and 

   // if you remove or change this line, make sure there is some credit here 

   // and a link to www.dynamic-core.net so that other people can also 

   // get their hands on this FREE search engine.. Thank you. 

   document.write("")

   templateEnd()

}

function search(keyword) {

   var hit=0

   var addcomplete=0

   for (q=0; q<records.length; q++) {

      addcomplete=0

      search_parm=" "+records[q].searchstring()+" "

      search_parm=search_parm.toLowerCase()

      if (keyword.indexOf(' AND ')>0) {

         firstword=keyword.substring(0,keyword.indexOf(' ')).toLowerCase()

         lastword=keyword.substring(keyword.indexOf(' AND ')+5,keyword.length).toLowerCase()

         if ((search_parm.indexOf(" "+firstword+" ") != -1) && (search_parm.indexOf(" "+lastword+" ")!= -1 )) {

            hit++

            finds++

            if(hit<2) {

               if (results[q].val==0) sites++

               results[q].val +=2

            }

         }

      } else {

         keyword=keyword.toLowerCase()

         if ((search_parm.indexOf(" "+keyword+" ") != -1) ||(keyword=="[all]")) {

            hit++

            finds++

            if(hit<2) {

               if (results[q].val==0) sites++

               results[q].val+=2

            }

         } else {

            // check for a half hit (ie. search:share find:SHAREware) 

            if (search_parm.indexOf(keyword) != -1)   {

               hit++

               finds++

               if(hit < 2) {

                  if (results[q].val==0) sites++

                  results[q].val+=1

                  x=search_parm.indexOf(keyword)+keyword.length

                  pos=search_parm.substring(1,x-keyword.length)

                  while (pos.indexOf(" ")!=-1) {

                     y=pos.indexOf(" ")

                     pos=pos.substring(y+1,pos.length)

                  }

                  if (pos.length<=2) addcomplete++

                  pos=search_parm.substring(x,search_parm.length)

                  fullresult=search_parm.substring(x,x+pos.indexOf(" "))

                  if (fullresult.length<=2) addcomplete++

                  if (addcomplete>1) results[q].val+=1

               }

            }

         }

      }

      hit=0

   }

}

var searchwords = ''

var newload = true

function initXsearch() {

   if (searchwords!='') searchAll(searchwords)

   else if (newload) Cat()

}

function tparams(){

   parameters=document.location.search

   parameters=unescape(parameters.substring(1,parameters.length)+'&')

   this.params=new Array()

   i=0

   while (parameters.indexOf('&',0)!=-1) {

      al=this.params.length

      this.params[al]=new Array()

      tmp=parameters.substring(0,parameters.indexOf('&',0))

      parameters=parameters.substring(parameters.indexOf('&',0)+1)

      if (tmp.indexOf('=')!=-1) {

         this.params[al].command=tmp.substring(0,tmp.indexOf('='))

         this.params[al].value=tmp.substring(tmp.indexOf('=')+1)

      } else {

         this.params[al].command=tmp

         this.params[al].value=''

      }

   }

   return this

}

tparams.prototype.getValue=function(param){

   value=''

   param=param.toLowerCase()

   al=this.params.length

   for (var i=0; i<al; i+=1) if (this.params[i].command==param) value=this.params[i].value

   return value

}

params=new tparams()

if (params.getValue('keywords')!=''){

   searchwords=params.getValue('keywords')

   origsearchwords=searchwords

   while (searchwords.indexOf('+')>-1) {

      pos=searchwords.indexOf('+')

      searchwords=searchwords.substring(0,pos)+' '+searchwords.substring(pos+1)

   }

}

if (params.getValue('sort')!='')

   if (params.getValue('sort')=='0' || params.getValue('sort')=='false') SortResults=false

   else SortResults=true

if (params.getValue('and')!='')

   if (params.getValue('and')=='0' || params.getValue('and')=='false') andresult=false

   else andresult=true

if (params.getValue('disp')!='') display_start=parseInt(params.getValue('disp'))