1 files changed, 91 insertions, 0 deletions
diff --git a/chapter-7/propagators.js b/chapter-7/propagators.js
new file mode 100644
index 0000000..1477a86
--- /dev/null
+++ b/chapter-7/propagators.js
@@ -0,0 +1,91 @@
+window.addEventListener("load", async () => {
+  await Scheme.load_main("propagators.wasm", {
+    reflect_wasm_dir: "hoot",
+    user_imports: {
+      window: {
+        scrollTo: window.scrollTo,
+        setTimeout: setTimeout,
+        getWindow: function() {
+          return window;
+        },
+      },
+      document: {
+        makeTextNode: Document.prototype.createTextNode.bind(document),
+        makeElement: Document.prototype.createElement.bind(document),
+        getElementById: Document.prototype.getElementById.bind(document),
+        getBody: function() {
+          return document.body;
+        },
+      },
+      element: {
+        firstChild: (elem) => elem.firstChild,
+        nextSibling: (elem) => elem.nextSibling,
+        appendChild: function(parent, child) {
+          return parent.appendChild(child);
+        },
+        setAttribute: function(elem, attr, value) {
+          return elem.setAttribute(attr, value);
+        },
+        getAttribute: function(elem, attr) {
+          return elem.getAttribute(attr);
+        },
+        getProperty: function(elem, property, dflt) {
+          // The little + '' ensures the value is a string
+          return value = elem[property] + '';
+        },
+        setProperty: function(elem, property, new_value) {
+          elem[property] = new_value;
+        },
+        getValue: (elem) => elem.value,
+        setValue: (elem, val) => elem.value = val,
+        remove: function(elem) {
+          elem.remove();
+        },
+        replaceWith: (oldElem, newElem) => oldElem.replaceWith(newElem),
+        addEventListener: function(elem, name, f) {
+          elem.addEventListener(name, f);
+        },
+      },
+      websocket: {
+        create: function(uri) {
+          ws = new WebSocket(uri);
+          return ws;
+        },
+        registerHandler: function(sock, handler, f) {
+          sock[handler] = function (event) {
+            if (handler == "onmessage") {
+              f(event.data);
+            } else {
+              f(event);
+            }
+          };
+        },
+        send: function(sock, message) {
+          sock.send(message);
+        },
+      },
+      notification: {
+        create: function(text) {
+          return new Notification(text);
+        },
+        permission: function() {
+          return Notification.permission;
+        },
+        requestPermission: Notification.requestPermission,
+      },
+      promise: {
+        on: function(promise, f) {
+          promise.then(f);
+        },
+      },
+      localStorage: {
+        getItem: (key) => localStorage.getItem(key) || "#f",
+        setItem: (key, value) => localStorage.setItem(key, value)
+      },
+      location: {
+        protocol: () => location.protocol,
+        hostname: () => location.hostname
+      }
+    }
+  });
+});