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util.js
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util.js
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/*
* Actions is an array of functions that accept a callback
* as an argument. Each of these functions should return
* some hook to the async action so that it may be cancelled
* at a later time.
*/
exports.latch = function (actions, callback) {
var cnt = actions.length;
var cb = function() {
if(--cnt != 0) {
return;
} else {
callback.apply(this, arguments);
}
};
return actions.map(function(f) {
f(cb);
});
};
exports.getUniqueId = (function() {
var id = 0;
return function(reset) {
if(reset) {
id = 1;
return 0;
} else {
return id++;
}
};
})();
exports.getUniquePrefixId = (function() {
var ids = {};
return function(prefix, reset) {
ids[prefix] = ids[prefix] || 0;
if(reset) {
ids[prefix] = 1;
return prefix + 0;
} else {
return prefix + ids[prefix]++;
}
};
})();
/*
* This is destructive!
* It returns the list as a convenience.
*/
exports.randomize = function(list) {
for(var i = 0; i < list.length; i++) {
var j = Math.floor(Math.random() * list.length);
var tempi = list[i];
list[i] = list[j];
list[j] = tempi;
}
return list;
};
/*
* This only makes a new list, the items in the list are shared between this and the old!
*/
exports.safeRandomize = function(list) {
return exports.randomize(list.concat([]));
};
exports.delayMap = function(items, callback, delay) {
var o = {};
var i = 0;
var f = function() {
if(i < items.length) {
callback(items[i++]);
return o.id = setTimeout(f, delay);
}
};
o.id = f();
return o;
};
/*
* Limit the execution of a function to once during a set interval,
* then queue up any invocations after the first. A timeout object
* is returned so queued up invocations can be cleared out.
*/
exports.throttle = function (func, t, ctx) {
var timeout = false
, queue = []
, qf = function() {
var q = queue.shift();
if(q) { q(); timeout = setTimeout(qf, t); } else { timeout = false; }
}
;
var f = function() {
var args = arguments
, i = function() {
func.apply(ctx, args);
};
if(timeout && timeout._idleNext) {
queue.push(i);
} else {
i();
timeout = setTimeout(qf, t);
}
return timeout;
};
return f;
}
/*
var l = exports.throttle(function(a, b) { console.log([a, b]); }, 1000);
l('a', 1);
l('b', 2);
l('c', 3);
setTimeout(function(){l('d', 4);}, 2000);
*/
/*
* Limit the execution of a function to once during a set interval,
* then queue up any invocations after the first. A timeout object
* is returned so queued up invocations can be cleared out.
*/
exports.burstThrottle = function (func, b, bt, t, ctx) {
var timeout = false
, bTimeout = false
, burst = 0
, queue = []
, qf = function() {
var q = queue.shift();
if(q) { q(); timeout = setTimeout(qf, t); } else { timeout = false; }
}
;
var f = function() {
var args = arguments
, i = function() {
func.apply(ctx, args);
};
if(timeout && timeout._idleNext) {
queue.push(i);
} else {
if(burst++ >= b) {
timeout = setTimeout(qf, t);
queue.push(i);
} else {
i();
}
if(!bTimeout) {
bTimeout = setTimeout(function() {
burst = 0;
bTimeout = false;
}, bt);
}
}
return timeout;
};
return f;
}
/*
var l = exports.burstThrottle(function(a, b) { console.log([a, b]); }, 3, 1000, 2000);
l('a', 1);
l('b', 2);
l('c', 3);
l('d', 4);
l('e', 5);
l('f', 6);
setTimeout(function(){
l('g', 7);
l('h', 8);
l('i', 9);
l('j', 10);
l('k', 11);
l('l', 12);
}, 12000);
*/
exports.split = function(str, separator, limit) {
var isep = str.indexOf(separator)
, ilast = 0
, sp = []
;
while(isep >= 0 && sp.length < limit - 1) {
sp.push(str.substring(ilast, isep));
ilast = isep + 1;
isep = str.indexOf(separator, ilast);
}
sp.push(str.substring(ilast));
return sp;
};
exports.group = function(a) {
if(a.length < 2) {
return [a];
}
var ret = [[a[0]]];
for(var i = 1; i < a.length; i++) {
if(ret[0][0] === a[i]) {
ret[0].push(a[i]);
} else {
ret.unshift([a[i]]);
}
}
return ret.reverse();
}