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src/lib/navigation.js

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+// Helper functions for hash navigation.
+
+// Parse hash as in http://www.example.com/path#hash as if it were
+// path and arguments.
+export function parseUrlHash(hash) {
+  // Split path from args, path -> parts[0], args->path[1]
+  let parts = hash.split('?', 2);
+  let params = {};
+  let path = [];
+  if (parts[0]) {
+    path = parts[0].substr(1).split('/');
+  }
+  if (parts[1]) {
+    parts[1].split('&').forEach(function(part) {
+      let item = part.split('=');
+      if (item[0]) {
+        params[decodeURIComponent(item[0])] = decodeURIComponent(item[1]);
+      }
+    });
+  }
+  return {path: path, params: params};
+}
+
+export function navigateTo(url) {
+  window.location.hash = url;
+}
+
+export function composeUrlHash(path, params) {
+  var url = path.join('/');
+  var args = [];
+  for (var key in params) {
+    if (params.hasOwnProperty(key)) {
+      args.push(key + '=' + params[key]);
+    }
+  }
+  if (args.length > 0) {
+    url += '?' + args.join('&');
+  }
+  return url;
+}
+
+export function addUrlParam(hash, key, value) {
+  var parsed = parseUrlHash(hash);
+  parsed.params[key] = value;
+  return composeUrlHash(parsed.path, parsed.params);
+}
+
+export function removeUrlParam(hash, key) {
+  var parsed = parseUrlHash(hash);
+  delete parsed.params[key];
+  return composeUrlHash(parsed.path, parsed.params);
+}
+
+export function setUrlSidePanel(hash, sidepanel) {
+  var parsed = parseUrlHash(hash);
+  parsed.path[0] = sidepanel;
+  return composeUrlHash(parsed.path, parsed.params);
+}
+
+export function setUrlTopic(hash, topic) {
+  var parsed = parseUrlHash(hash);
+  parsed.path[1] = topic;
+  // Close InfoView on topic change.
+  delete parsed.params.info;
+  return composeUrlHash(parsed.path, parsed.params);
+}
+// END of hash navigation helper functions