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// a set of utility functions for triggers
Triggers = {};
// Apply filters for a set of triggers
// @triggers - a set of triggers
// @filter - filter with array fileds with `only` and `except`
// support only either `only` or `except`, but not both
Triggers.applyFilters = function(triggers, filter) {
if(!(triggers instanceof Array)) {
triggers = [triggers];
}
if(!filter) {
return triggers;
}
if(filter.only && filter.except) {
throw new Error("Triggers don't support only and except filters at once");
}
if(filter.only && !(filter.only instanceof Array)) {
throw new Error("only filters needs to be an array");
}
if(filter.except && !(filter.except instanceof Array)) {
throw new Error("except filters needs to be an array");
}
if(filter.only) {
return Triggers.createRouteBoundTriggers(triggers, filter.only);
}
if(filter.except) {
return Triggers.createRouteBoundTriggers(triggers, filter.except, true);
}
throw new Error("Provided a filter but not supported");
};
// create triggers by bounding them to a set of route names
// @triggers - a set of triggers
// @names - list of route names to be bound (trigger runs only for these names)
// @negate - negate the result (triggers won't run for above names)
Triggers.createRouteBoundTriggers = function(triggers, names, negate) {
var namesMap = {};
_.each(names, function(name) {
namesMap[name] = true;
});
var filteredTriggers = _.map(triggers, function(originalTrigger) {
var modifiedTrigger = function(context, next) {
var routeName = context.route.name;
var matched = (namesMap[routeName])? 1: -1;
matched = (negate)? matched * -1 : matched;
if(matched === 1) {
originalTrigger(context, next);
}
};
return modifiedTrigger;
});
return filteredTriggers;
};
// run triggers and abort if redirected or callback stopped
// @triggers - a set of triggers
// @context - context we need to pass (it must have the route)
// @redirectFn - function which used to redirect
// @after - called after if only all the triggers runs
Triggers.runTriggers = function(triggers, context, redirectFn, after) {
var abort = false;
var inCurrentLoop = true;
var alreadyRedirected = false;
for(var lc=0; lc<triggers.length; lc++) {
var trigger = triggers[lc];
trigger(context, doRedirect, doStop);
if(abort) {
return;
}
}
// mark that, we've exceeds the currentEventloop for
// this set of triggers.
inCurrentLoop = false;
after();
function doRedirect(url, params, queryParams) {
if(alreadyRedirected) {
throw new Error("already redirected");
}
if(!inCurrentLoop) {
throw new Error("redirect needs to be done in sync");
}
if(!url) {
throw new Error("trigger redirect requires an URL");
}
abort = true;
alreadyRedirected = true;
redirectFn(url, params, queryParams);
}
function doStop() {
abort = true;
}
};
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