[REF] runtime: rename handler.ts -> event_handling.ts

src/runtime/event_handling.ts

@@ -0,0 +1,44 @@
+import { filterOutModifiersFromData } from "./blockdom/config";
+import { STATUS } from "./status";
+
+export const mainEventHandler = (data: any, ev: Event, currentTarget?: EventTarget | null) => {
+  const { data: _data, modifiers } = filterOutModifiersFromData(data);
+  data = _data;
+  let stopped = false;
+  if (modifiers.length) {
+    let selfMode = false;
+    const isSelf = ev.target === currentTarget;
+    for (const mod of modifiers) {
+      switch (mod) {
+        case "self":
+          selfMode = true;
+          if (isSelf) {
+            continue;
+          } else {
+            return stopped;
+          }
+        case "prevent":
+          if ((selfMode && isSelf) || !selfMode) ev.preventDefault();
+          continue;
+        case "stop":
+          if ((selfMode && isSelf) || !selfMode) ev.stopPropagation();
+          stopped = true;
+          continue;
+      }
+    }
+  }
+  // If handler is empty, the array slot 0 will also be empty, and data will not have the property 0
+  // We check this rather than data[0] being truthy (or typeof function) so that it crashes
+  // as expected when there is a handler expression that evaluates to a falsy value
+  if (Object.hasOwnProperty.call(data, 0)) {
+    const handler = data[0];
+    if (typeof handler !== "function") {
+      throw new Error(`Invalid handler (expected a function, received: '${handler}')`);
+    }
+    let node = data[1] ? data[1].__owl__ : null;
+    if (node ? node.status === STATUS.MOUNTED : true) {
+      handler.call(node ? node.component : null, ev);
+    }
+  }
+  return stopped;
+};