--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.cms/lib/codemirror/src/util/event.js	Fri Oct 11 22:40:23 2024 +0000
@@ -0,0 +1,103 @@
+import { mac } from "./browser.js"
+import { indexOf } from "./misc.js"
+
+// EVENT HANDLING
+
+// Lightweight event framework. on/off also work on DOM nodes,
+// registering native DOM handlers.
+
+const noHandlers = []
+
+export let on = function(emitter, type, f) {
+  if (emitter.addEventListener) {
+    emitter.addEventListener(type, f, false)
+  } else if (emitter.attachEvent) {
+    emitter.attachEvent("on" + type, f)
+  } else {
+    let map = emitter._handlers || (emitter._handlers = {})
+    map[type] = (map[type] || noHandlers).concat(f)
+  }
+}
+
+export function getHandlers(emitter, type) {
+  return emitter._handlers && emitter._handlers[type] || noHandlers
+}
+
+export function off(emitter, type, f) {
+  if (emitter.removeEventListener) {
+    emitter.removeEventListener(type, f, false)
+  } else if (emitter.detachEvent) {
+    emitter.detachEvent("on" + type, f)
+  } else {
+    let map = emitter._handlers, arr = map && map[type]
+    if (arr) {
+      let index = indexOf(arr, f)
+      if (index > -1)
+        map[type] = arr.slice(0, index).concat(arr.slice(index + 1))
+    }
+  }
+}
+
+export function signal(emitter, type /*, values...*/) {
+  let handlers = getHandlers(emitter, type)
+  if (!handlers.length) return
+  let args = Array.prototype.slice.call(arguments, 2)
+  for (let i = 0; i < handlers.length; ++i) handlers[i].apply(null, args)
+}
+
+// The DOM events that CodeMirror handles can be overridden by
+// registering a (non-DOM) handler on the editor for the event name,
+// and preventDefault-ing the event in that handler.
+export function signalDOMEvent(cm, e, override) {
+  if (typeof e == "string")
+    e = {type: e, preventDefault: function() { this.defaultPrevented = true }}
+  signal(cm, override || e.type, cm, e)
+  return e_defaultPrevented(e) || e.codemirrorIgnore
+}
+
+export function signalCursorActivity(cm) {
+  let arr = cm._handlers && cm._handlers.cursorActivity
+  if (!arr) return
+  let set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = [])
+  for (let i = 0; i < arr.length; ++i) if (indexOf(set, arr[i]) == -1)
+    set.push(arr[i])
+}
+
+export function hasHandler(emitter, type) {
+  return getHandlers(emitter, type).length > 0
+}
+
+// Add on and off methods to a constructor's prototype, to make
+// registering events on such objects more convenient.
+export function eventMixin(ctor) {
+  ctor.prototype.on = function(type, f) {on(this, type, f)}
+  ctor.prototype.off = function(type, f) {off(this, type, f)}
+}
+
+// Due to the fact that we still support jurassic IE versions, some
+// compatibility wrappers are needed.
+
+export function e_preventDefault(e) {
+  if (e.preventDefault) e.preventDefault()
+  else e.returnValue = false
+}
+export function e_stopPropagation(e) {
+  if (e.stopPropagation) e.stopPropagation()
+  else e.cancelBubble = true
+}
+export function e_defaultPrevented(e) {
+  return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
+}
+export function e_stop(e) {e_preventDefault(e); e_stopPropagation(e)}
+
+export function e_target(e) {return e.target || e.srcElement}
+export function e_button(e) {
+  let b = e.which
+  if (b == null) {
+    if (e.button & 1) b = 1
+    else if (e.button & 2) b = 3
+    else if (e.button & 4) b = 2
+  }
+  if (mac && e.ctrlKey && b == 1) b = 3
+  return b
+}