1 files changed, 52 insertions, 6 deletions
diff --git a/src/mind/topology.js b/src/mind/topology.js
index 58e229e..755fe4a 100644
--- a/src/mind/topology.js
+++ b/src/mind/topology.js
@@ -1,14 +1,60 @@
 'use strict';
 
 
-const PointProto = {
-	
+const DEFAULT_WEIGHT_MAX = 4;
+
+
+const graph_proto = {
+	connect: function(source, sink, weight) {
+		return network_connect(this, source, sink, weight);
+	},
 };
 
+export function network(input_count, internal_count, output_count, weight_max = 4) {
+	const count = input_count + internal_count + output_count;
+	const n = Object.create(graph_proto);
+	n.input_count = input_count;
+	n.output_count = output_count;
+	n.adjacency = new Array(count).fill([]);
+	n.weight = [];
+	return Object.freeze(n);
+}
+
+
+function is_input(n, index) {
+	return index < n.input_count;
+}
+function is_output(n, index) {
+	return index >= (n.adjacency.length - n.output_count);
+}
+
 
-export function Point(layer, index) {
-	return Object.freeze({
-		layer,
-		index,
+function network_connect(n, source, sink, weight) {
+	if (is_input(n, sink)) {
+		// inputs cannot be sinks
+		throw new Error("attempt to use input as sink");
+	}
+	if (is_output(n, source)) {
+		// outputs cannot be sources
+		throw new Error("attempt to use output as source");
+	}
+
+	const nn = Object.create(graph_proto);
+	nn.input_count = n.input_count;
+	nn.output_count = n.output_count;
+	nn.adjacency = n.adjacency.map((row, i) => {
+		if (i === source && i === sink) {
+			// self-loop
+			return [...row, 2];
+		} else if (i === source) {
+			return [...row, 1];
+		} else if (i === sink) {
+			return [...row, -1];
+		} else {
+			return [...row, 0];
+		}
 	});
+	nn.weight = [...n.weight, weight];
+
+	return Object.freeze(nn);
 }