reductio/src/exception-count.js

Reductio: Crossfilter groupings

var exception_count = {
	add: function (a, prior, path) {
		var i, curr;
		return function (p, v, nf) {
			if(prior) prior(p, v, nf);
			// Only count++ if the p.values array doesn't contain a(v) or if it's 0.
			i = path(p).bisect(path(p).values, a(v), 0, path(p).values.length);
			curr = path(p).values[i];
			if((!curr || curr[0] !== a(v)) || curr[1] === 0) {
				path(p).exceptionCount++;
			}
			return p;
		};
	},
	remove: function (a, prior, path) {
		var i, curr;
		return function (p, v, nf) {
			if(prior) prior(p, v, nf);
			// Only count-- if the p.values array contains a(v) value of 1.
			i = path(p).bisect(path(p).values, a(v), 0, path(p).values.length);
			curr = path(p).values[i];
			if(curr && curr[0] === a(v) && curr[1] === 1) {
				path(p).exceptionCount--;
			}
			return p;
		};
	},
	initial: function (prior, path) {
		return function (p) {
			p = prior(p);
			path(p).exceptionCount = 0;
			return p;
		};
	}
};

export default exception_count;