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Object.extend(String.prototype, {
pad : function(side, len, chr) {
if (!chr) chr = ' ';
var s = this;
var left = side.toLowerCase()=='left';
while (s.length<len) s = left? chr + s : s + chr;
return s;
},
padLeft : function(len, chr) {
return this.pad('left',len,chr);
},
padRight : function(len, chr) {
return this.pad('right',len,chr);
},
zerofill : function(len) {
return this.padLeft(len,'0');
},
trim : function() {
return this.replace(/^\s+|\s+$/g,'');
},
trimLeft : function() {
return this.replace(/^\s+/,'');
},
trimRight : function() {
return this.replace(/\s+$/,'');
},
/**
* Convert period separated function names into a function reference.
* e.g. "Prado.AJAX.Callback.Action.setValue".toFunction() will return
* the actual function Prado.AJAX.Callback.Action.setValue()
* @return Function the corresponding function represented by the string.
*/
toFunction : function()
{
var commands = this.split(/\./);
var command = window;
commands.each(function(action)
{
if(command[new String(action)])
command=command[new String(action)];
});
if(isFunction(command))
return command;
else
{
if(typeof Logger != "undefined")
Logger.error("Missing function", this);
return Prototype.emptyFunction;
}
},
/**
* Convert a string into integer, returns null if not integer.
* @return {integer|null} null if string does not represent an integer.
*/
toInteger : function()
{
var exp = /^\s*[-\+]?\d+\s*$/;
if (this.match(exp) == null)
return null;
var num = parseInt(this, 10);
return (isNaN(num) ? null : num);
},
/**
* Convert a string into a double/float value. <b>Internationalization
* is not supported</b>
* @param {string} the decimal character
* @return {float|null} null if string does not represent a float value
*/
toDouble : function(decimalchar)
{
decimalchar = decimalchar || ".";
var exp = new RegExp("^\\s*([-\\+])?(\\d+)?(\\" + decimalchar + "(\\d+))?\\s*$");
var m = this.match(exp);
if (m == null)
return null;
var cleanInput = m[1] + (m[2].length>0 ? m[2] : "0") + "." + m[4];
var num = parseFloat(cleanInput);
return (isNaN(num) ? null : num);
},
/**
* Convert strings that represent a currency value (e.g. a float with grouping
* characters) to float. E.g. "10,000.50" will become "10000.50". The number
* of dicimal digits, grouping and decimal characters can be specified.
* <i>The currency input format is <b>very</b> strict, null will be returned if
* the pattern does not match</i>.
* @param {string} the grouping character, default is ","
* @param {int} number of decimal digits
* @param {string} the decimal character, default is "."
* @type {float|null} the currency value as float.
*/
toCurrency : function(groupchar, digits, decimalchar)
{
groupchar = groupchar || ",";
decimalchar = decimalchar || ".";
digits = typeof(digits) == "undefined" ? 2 : digits;
var exp = new RegExp("^\\s*([-\\+])?(((\\d+)\\" + groupchar + ")*)(\\d+)"
+ ((digits > 0) ? "(\\" + decimalchar + "(\\d{1," + digits + "}))?" : "")
+ "\\s*$");
var m = this.match(exp);
if (m == null)
return null;
var intermed = m[2] + m[5] ;
var cleanInput = m[1] + intermed.replace(
new RegExp("(\\" + groupchar + ")", "g"), "")
+ ((digits > 0) ? "." + m[7] : "");
var num = parseFloat(cleanInput);
return (isNaN(num) ? null : num);
}
});
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