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/**
* Various helper functions
*/
/**
* A PHP-style substr_replace
*
* Supports negative start and length and omitting length, but not
* str and replace arrays.
* See http://php.net/substr-replace for further documentation.
*/
function substr_replace(str, replace, start, length) {
var a2, b1;
a2 = (start < 0 ? str.length : 0) + start;
if (typeof length === 'undefined') {
length = str.length - a2;
} else if (length < 0 && start < 0 && length <= start) {
length = 0;
}
b1 = (length < 0 ? str.length : a2) + length;
return str.substring(0, a2) + replace + str.substring(b1);
}
/**
* Bind variables to a function call creating a closure
*
* Use this to circumvent variable scope problems when creating closures
* inside a loop
*
* @author Adrian Lang <lang@cosmocode.de>
* @link http://www.cosmocode.de/en/blog/gohr/2009-10/15-javascript-fixing-the-closure-scope-in-loops
* @param functionref fnc - the function to be called
* @param mixed - any arguments to be passed to the function
* @returns functionref
*/
function bind(fnc/*, ... */) {
var Aps = Array.prototype.slice,
// Store passed arguments in this scope.
// Since arguments is no Array nor has an own slice method,
// we have to apply the slice method from the Array.prototype
static_args = Aps.call(arguments, 1);
// Return a function evaluating the passed function with the
// given args and optional arguments passed on invocation.
return function (/* ... */) {
// Same here, but we use Array.prototype.slice solely for
// converting arguments to an Array.
return fnc.apply(this,
static_args.concat(Aps.call(arguments, 0)));
};
}
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