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/**
* @class String extensions
*/
Object.extend(String.prototype,
{
/**
* @param {String} "left" to pad the string on the left, "right" to pad right.
* @param {Number} minimum string length.
* @param {String} character(s) to pad
* @return {String} padded character(s) on the left or right to satisfy minimum string length
*/
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;
},
/**
* @param {Number} minimum string length.
* @param {String} character(s) to pad
* @return {String} padded character(s) on the left to satisfy minimum string length
*/
padLeft : function(len, chr) {
return this.pad('left',len,chr);
},
/**
* @param {Number} minimum string length.
* @param {String} character(s) to pad
* @return {String} padded character(s) on the right to satisfy minimum string length
*/
padRight : function(len, chr) {
return this.pad('right',len,chr);
},
/**
* @param {Number} minimum string length.
* @return {String} append zeros to the left to satisfy minimum string length.
*/
zerofill : function(len) {
return this.padLeft(len,'0');
},
/**
* @return {String} removed white spaces from both ends.
*/
trim : function() {
return this.replace(/^\s+|\s+$/g,'');
},
/**
* @return {String} removed white spaces from the left end.
*/
trimLeft : function() {
return this.replace(/^\s+/,'');
},
/**
* @return {String} removed white spaces from the right end.
*/
trimRight : function() {
return this.replace(/\s+$/,'');
},
/**
* 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(typeof(command) == "function")
return command;
else
{
if(typeof Logger != "undefined")
Logger.error("Missing function", this);
throw new Error ("Missing function '"+this+"'");
}
},
/**
* Convert a string into integer, returns null if not integer.
* @return {Number} null if string does not represent an integer.
*/
toInteger : function()
{
var exp = /^\s*[-\+]?\d+\s*$/;
if (this.match(exp) == null)
return null;
var num = parseInt(this, 10);
return (isNaN(num) ? null : num);
},
/**
* Convert a string into a double/float value. <b>Internationalization
* is not supported</b>
* @param {String} the decimal character
* @return {Double} null if string does not represent a float value
*/
toDouble : function(decimalchar)
{
if(this.length <= 0) return null;
decimalchar = decimalchar || ".";
var exp = new RegExp("^\\s*([-\\+])?(\\d+)?(\\" + decimalchar + "(\\d+))?\\s*$");
var m = this.match(exp);
if (m == null)
return null;
m[1] = m[1] || "";
m[2] = m[2] || "0";
m[4] = m[4] || "0";
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 {Number} number of decimal digits
* @param {String} the decimal character, default is "."
* @type {Double} 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);
},
/**
* Converts the string to a date by finding values that matches the
* date format pattern.
* @param string date format pattern, e.g. MM-dd-yyyy
* @return {Date} the date extracted from the string
*/
toDate : function(format)
{
return Date.SimpleParse(this, format);
}
});
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