Implementação de Printf em JS
Enviado: 02 Fev 2007 00:00Depois de ficar "bege" kkkkkkkkkkkkkkk pelo fato de JS nao ter uma mízera função de formatação como o printf e sprintf (que até em PHP tem)....fui atras....
- Código: Selecionar todos
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-gb">
<head>
<title>printf() Testing</title>
<style>
</style>
<script id="klSTDIOH">
/* Function printf(format_string,arguments...)
* Javascript emulation of the C printf function (modifiers and argument types
* "p" and "n" are not supported due to language restrictions)
*
* Copyright 2003 K&L Productions. All rights reserved
* http://www.klproductions.com
*
* Terms of use: This function can be used free of charge IF this header is not
* modified and remains with the function code.
*
* Legal: Use this code at your own risk. K&L Productions assumes NO resposibility
* for anything.
********************************************************************************/
function printf(fstring)
{ var pad = function(str,ch,len)
{ var ps='';
for(var i=0; i<Math.abs(len); i++) ps+=ch;
return len>0?str+ps:ps+str;
}
var processFlags = function(flags,width,rs,arg)
{ var pn = function(flags,arg,rs)
{ if(arg>=0)
{ if(flags.indexOf(' ')>=0) rs = ' ' + rs;
else if(flags.indexOf('+')>=0) rs = '+' + rs;
}
else
rs = '-' + rs;
return rs;
}
var iWidth = parseInt(width,10);
if(width.charAt(0) == '0')
{ var ec=0;
if(flags.indexOf(' ')>=0 || flags.indexOf('+')>=0) ec++;
if(rs.length<(iWidth-ec)) rs = pad(rs,'0',rs.length-(iWidth-ec));
return pn(flags,arg,rs);
}
rs = pn(flags,arg,rs);
if(rs.length<iWidth)
{ if(flags.indexOf('-')<0) rs = pad(rs,' ',rs.length-iWidth);
else rs = pad(rs,' ',iWidth - rs.length);
}
return rs;
}
var converters = new Array();
converters['c'] = function(flags,width,precision,arg)
{ if(typeof(arg) == 'number') return String.fromCharCode(arg);
if(typeof(arg) == 'string') return arg.charAt(0);
return '';
}
converters['d'] = function(flags,width,precision,arg)
{ return converters['i'](flags,width,precision,arg);
}
converters['u'] = function(flags,width,precision,arg)
{ return converters['i'](flags,width,precision,Math.abs(arg));
}
converters['i'] = function(flags,width,precision,arg)
{ var iPrecision=parseInt(precision);
var rs = ((Math.abs(arg)).toString().split('.'))[0];
if(rs.length<iPrecision) rs=pad(rs,' ',iPrecision - rs.length);
return processFlags(flags,width,rs,arg);
}
converters['E'] = function(flags,width,precision,arg)
{ return (converters['e'](flags,width,precision,arg)).toUpperCase();
}
converters['e'] = function(flags,width,precision,arg)
{ iPrecision = parseInt(precision);
if(isNaN(iPrecision)) iPrecision = 6;
rs = (Math.abs(arg)).toExponential(iPrecision);
if(rs.indexOf('.')<0 && flags.indexOf('#')>=0) rs = rs.replace(/^(.*)(e.*)$/,'$1.$2');
return processFlags(flags,width,rs,arg);
}
converters['f'] = function(flags,width,precision,arg)
{ iPrecision = parseInt(precision);
if(isNaN(iPrecision)) iPrecision = 6;
rs = (Math.abs(arg)).toFixed(iPrecision);
if(rs.indexOf('.')<0 && flags.indexOf('#')>=0) rs = rs + '.';
return processFlags(flags,width,rs,arg);
}
converters['G'] = function(flags,width,precision,arg)
{ return (converters['g'](flags,width,precision,arg)).toUpperCase();
}
converters['g'] = function(flags,width,precision,arg)
{ iPrecision = parseInt(precision);
absArg = Math.abs(arg);
rse = absArg.toExponential();
rsf = absArg.toFixed(6);
if(!isNaN(iPrecision))
{ rsep = absArg.toExponential(iPrecision);
rse = rsep.length < rse.length ? rsep : rse;
rsfp = absArg.toFixed(iPrecision);
rsf = rsfp.length < rsf.length ? rsfp : rsf;
}
if(rse.indexOf('.')<0 && flags.indexOf('#')>=0) rse = rse.replace(/^(.*)(e.*)$/,'$1.$2');
if(rsf.indexOf('.')<0 && flags.indexOf('#')>=0) rsf = rsf + '.';
rs = rse.length<rsf.length ? rse : rsf;
return processFlags(flags,width,rs,arg);
}
converters['o'] = function(flags,width,precision,arg)
{ var iPrecision=parseInt(precision);
var rs = Math.round(Math.abs(arg)).toString(8);
if(rs.length<iPrecision) rs=pad(rs,' ',iPrecision - rs.length);
if(flags.indexOf('#')>=0) rs='0'+rs;
return processFlags(flags,width,rs,arg);
}
converters['X'] = function(flags,width,precision,arg)
{ return (converters['x'](flags,width,precision,arg)).toUpperCase();
}
converters['x'] = function(flags,width,precision,arg)
{ var iPrecision=parseInt(precision);
arg = Math.abs(arg);
var rs = Math.round(arg).toString(16);
if(rs.length<iPrecision) rs=pad(rs,' ',iPrecision - rs.length);
if(flags.indexOf('#')>=0) rs='0x'+rs;
return processFlags(flags,width,rs,arg);
}
converters['s'] = function(flags,width,precision,arg)
{ var iPrecision=parseInt(precision);
var rs = arg;
if(rs.length > iPrecision) rs = rs.substring(0,iPrecision);
return processFlags(flags,width,rs,0);
}
farr = fstring.split('%');
retstr = farr[0];
fpRE = /^([-+ #]*)(\d*)\.?(\d*)([cdieEfFgGosuxX])(.*)$/;
for(var i=1; i<farr.length; i++)
{ fps=fpRE.exec(farr[i]);
if(!fps) continue;
if(arguments[i]!=null) retstr+=converters[fps[4]](fps[1],fps[2],fps[3],arguments[i]);
retstr += fps[5];
}
return retstr;
}
/* Function printf() END */
</script>
</head>
<body>
<h1>printf() Testing</h1>
<input type="text" id="testThis" value="printf('',);" style="width:80%"/>
<button onclick="document.getElementById('result').value=eval(document.getElementById('testThis').value);">Try</button>
<textarea id="result" rows="10" cols="10" style="width:90%; height:50%; margin: 10px auto;">
</textarea>
</body>
</html>
