Initial implementation

Author: RangerMauve

README.md

@@ -1,2 +1,4 @@
 # graphlib-json-graph
 Converts json-graph definitions into graphlib graphs.
+
+**Note: This is a work in progress**

index.js

@@ -0,0 +1,49 @@
+var graphlib = require("graphlib");
+var par = require("par");
+var prop = require("prop");
+
+var Graph = graphlib.Graph;
+
+module.exports = toGraph;
+
+function toGraph(json) {
+	var graphDefinitions = json.graphs;
+
+	if (graphDefinitions) return graphDefinitions.map(makeGraph);
+
+	var graphDefinition = json.graph;
+
+	if (graphDefinition)
+		return makeGraph(graphDefinition);
+
+	throw new TypeError("No graphs defined");
+}
+
+function makeGraph(graphDefinition) {
+	var nodes = graphDefinition.nodes || [];
+	var edges = graphDefinition.edges || [];
+
+	var directed = graphDefinition.directed || edges.some(prop("directed"));
+
+	var graph = new Graph({
+		directed: directed,
+		multigraph: true
+	});
+
+	nodes.forEach(par(addNode, graph));
+	edges.forEach(par(addEdge, graph));
+
+	return graph;
+}
+
+function addNode(graph, node) {
+	var id = node.id;
+	graph.setNode(id, node);
+}
+
+function addEdge(graph, edge) {
+	var source = edge.source;
+	var target = edge.target;
+	var id = edge.id;
+	graph.setEdge(source, target, edge, label);
+}

package.json

@@ -0,0 +1,29 @@
+{
+  "name": "graphlib-json-graph",
+  "version": "1.0.0",
+  "description": "Converts json-graph definitions into graphlib graphs.",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/jsongraph/graphlib-json-graph.git"
+  },
+  "keywords": [
+    "json",
+    "graph",
+    "graphlib"
+  ],
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/jsongraph/graphlib-json-graph/issues"
+  },
+  "homepage": "https://github.com/jsongraph/graphlib-json-graph",
+  "dependencies": {
+    "graphlib": "^1.0.4",
+    "par": "^0.3.0",
+    "prop": "^0.1.1"
+  }
+}