Na}{

File Content: route.js

var conversions = require('./conversions');

/*
	this function routes a model to all other models.

all functions that are routed have a property `.conversion` attached
	to the returned synthetic function. This property is an array
	of strings, each with the steps in between the 'from' and 'to'
	color models (inclusive).

conversions that are not possible simply are not included.
*/

function buildGraph() {
	var graph = {};
	// https://jsperf.com/object-keys-vs-for-in-with-closure/3
	var models = Object.keys(conversions);

for (var len = models.length, i = 0; i < len; i++) {
		graph[models[i]] = {
			// http://jsperf.com/1-vs-infinity
			// micro-opt, but this is simple.
			distance: -1,
			parent: null
		};
	}

return graph;
}

// https://en.wikipedia.org/wiki/Breadth-first_search
function deriveBFS(fromModel) {
	var graph = buildGraph();
	var queue = [fromModel]; // unshift -> queue -> pop

graph[fromModel].distance = 0;

while (queue.length) {
		var current = queue.pop();
		var adjacents = Object.keys(conversions[current]);

for (var len = adjacents.length, i = 0; i < len; i++) {
			var adjacent = adjacents[i];
			var node = graph[adjacent];

if (node.distance === -1) {
				node.distance = graph[current].distance + 1;
				node.parent = current;
				queue.unshift(adjacent);
			}
		}
	}

return graph;
}

function link(from, to) {
	return function (args) {
		return to(from(args));
	};
}

function wrapConversion(toModel, graph) {
	var path = [graph[toModel].parent, toModel];
	var fn = conversions[graph[toModel].parent][toModel];

var cur = graph[toModel].parent;
	while (graph[cur].parent) {
		path.unshift(graph[cur].parent);
		fn = link(conversions[graph[cur].parent][cur], fn);
		cur = graph[cur].parent;
	}

fn.conversion = path;
	return fn;
}

module.exports = function (fromModel) {
	var graph = deriveBFS(fromModel);
	var conversion = {};

var models = Object.keys(graph);
	for (var len = models.length, i = 0; i < len; i++) {
		var toModel = models[i];
		var node = graph[toModel];

if (node.parent === null) {
			// no possible conversion, or this node is the source model.
			continue;
		}

conversion[toModel] = wrapConversion(toModel, graph);
	}

return conversion;
};

Name	Size	Permission
CHANGELOG.md	1417 bytes	0644
LICENSE	1087 bytes	0644
README.md	2853 bytes	0644
conversions.js	16750 bytes	0644
index.js	1725 bytes	0644
package.json	1880 bytes	0644
route.js	2227 bytes	0644