Rename `eventHandler` and `selectorEngine` files.

1 files changed, 345 insertions, 0 deletions

diff --git a/js/src/dom/event-handler.js b/js/src/dom/event-handler.js
new file mode 100644
index 000000000..9e590de88
--- /dev/null
+++ b/js/src/dom/event-handler.js
@@ -0,0 +1,345 @@
+/**
+ * --------------------------------------------------------------------------
+ * Bootstrap (v4.3.1): dom/event-handler.js
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * --------------------------------------------------------------------------
+ */
+
+import { jQuery as $ } from '../util/index'
+import { createCustomEvent, defaultPreventedPreservedOnDispatch } from './polyfill'
+
+/**
+ * ------------------------------------------------------------------------
+ * Constants
+ * ------------------------------------------------------------------------
+ */
+
+const namespaceRegex = /[^.]*(?=\..*)\.|.*/
+const stripNameRegex = /\..*/
+const keyEventRegex = /^key/
+const stripUidRegex = /::\d+$/
+const eventRegistry = {} // Events storage
+let uidEvent = 1
+const customEvents = {
+  mouseenter: 'mouseover',
+  mouseleave: 'mouseout'
+}
+const nativeEvents = [
+  'click',
+  'dblclick',
+  'mouseup',
+  'mousedown',
+  'contextmenu',
+  'mousewheel',
+  'DOMMouseScroll',
+  'mouseover',
+  'mouseout',
+  'mousemove',
+  'selectstart',
+  'selectend',
+  'keydown',
+  'keypress',
+  'keyup',
+  'orientationchange',
+  'touchstart',
+  'touchmove',
+  'touchend',
+  'touchcancel',
+  'pointerdown',
+  'pointermove',
+  'pointerup',
+  'pointerleave',
+  'pointercancel',
+  'gesturestart',
+  'gesturechange',
+  'gestureend',
+  'focus',
+  'blur',
+  'change',
+  'reset',
+  'select',
+  'submit',
+  'focusin',
+  'focusout',
+  'load',
+  'unload',
+  'beforeunload',
+  'resize',
+  'move',
+  'DOMContentLoaded',
+  'readystatechange',
+  'error',
+  'abort',
+  'scroll'
+]
+
+/**
+ * ------------------------------------------------------------------------
+ * Private methods
+ * ------------------------------------------------------------------------
+ */
+
+function getUidEvent(element, uid) {
+  return uid && `${uid}::${uidEvent++}` || element.uidEvent || uidEvent++
+}
+
+function getEvent(element) {
+  const uid = getUidEvent(element)
+
+  element.uidEvent = uid
+  eventRegistry[uid] = eventRegistry[uid] || {}
+
+  return eventRegistry[uid]
+}
+
+function fixEvent(event, element) {
+  // Add which for key events
+  if (event.which === null && keyEventRegex.test(event.type)) {
+    event.which = event.charCode === null ? event.keyCode : event.charCode
+  }
+
+  event.delegateTarget = element
+}
+
+function bootstrapHandler(element, fn) {
+  return function handler(event) {
+    fixEvent(event, element)
+    if (handler.oneOff) {
+      EventHandler.off(element, event.type, fn)
+    }
+
+    return fn.apply(element, [event])
+  }
+}
+
+function bootstrapDelegationHandler(element, selector, fn) {
+  return function handler(event) {
+    const domElements = element.querySelectorAll(selector)
+
+    for (let { target } = event; target && target !== this; target = target.parentNode) {
+      for (let i = domElements.length; i--;) {
+        if (domElements[i] === target) {
+          fixEvent(event, target)
+
+          if (handler.oneOff) {
+            EventHandler.off(element, event.type, fn)
+          }
+
+          return fn.apply(target, [event])
+        }
+      }
+    }
+
+    // To please ESLint
+    return null
+  }
+}
+
+function findHandler(events, handler, delegationSelector = null) {
+  for (const uid of Object.keys(events)) {
+    const event = events[uid]
+
+    if (event.originalHandler === handler && event.delegationSelector === delegationSelector) {
+      return events[uid]
+    }
+  }
+
+  return null
+}
+
+function normalizeParams(originalTypeEvent, handler, delegationFn) {
+  const delegation = typeof handler === 'string'
+  const originalHandler = delegation ? delegationFn : handler
+
+  // allow to get the native events from namespaced events ('click.bs.button' --> 'click')
+  let typeEvent = originalTypeEvent.replace(stripNameRegex, '')
+  const custom = customEvents[typeEvent]
+
+  if (custom) {
+    typeEvent = custom
+  }
+
+  const isNative = nativeEvents.indexOf(typeEvent) > -1
+
+  if (!isNative) {
+    typeEvent = originalTypeEvent
+  }
+
+  return [delegation, originalHandler, typeEvent]
+}
+
+function addHandler(element, originalTypeEvent, handler, delegationFn, oneOff) {
+  if (typeof originalTypeEvent !== 'string' || !element) {
+    return
+  }
+
+  if (!handler) {
+    handler = delegationFn
+    delegationFn = null
+  }
+
+  const [delegation, originalHandler, typeEvent] = normalizeParams(originalTypeEvent, handler, delegationFn)
+  const events = getEvent(element)
+  const handlers = events[typeEvent] || (events[typeEvent] = {})
+  const previousFn = findHandler(handlers, originalHandler, delegation ? handler : null)
+
+  if (previousFn) {
+    previousFn.oneOff = previousFn.oneOff && oneOff
+
+    return
+  }
+
+  const uid = getUidEvent(originalHandler, originalTypeEvent.replace(namespaceRegex, ''))
+  const fn = delegation ? bootstrapDelegationHandler(element, handler, delegationFn) : bootstrapHandler(element, handler)
+
+  fn.delegationSelector = delegation ? handler : null
+  fn.originalHandler = originalHandler
+  fn.oneOff = oneOff
+  fn.uidEvent = uid
+  handlers[uid] = fn
+
+  element.addEventListener(typeEvent, fn, delegation)
+}
+
+function removeHandler(element, events, typeEvent, handler, delegationSelector) {
+  const fn = findHandler(events[typeEvent], handler, delegationSelector)
+
+  if (fn === null) {
+    return
+  }
+
+  element.removeEventListener(typeEvent, fn, Boolean(delegationSelector))
+  delete events[typeEvent][fn.uidEvent]
+}
+
+function removeNamespacedHandlers(element, events, typeEvent, namespace) {
+  const storeElementEvent = events[typeEvent] || {}
+
+  Object.keys(storeElementEvent)
+    .forEach(handlerKey => {
+      if (handlerKey.indexOf(namespace) > -1) {
+        const event = storeElementEvent[handlerKey]
+
+        removeHandler(element, events, typeEvent, event.originalHandler, event.delegationSelector)
+      }
+    })
+}
+
+const EventHandler = {
+  on(element, event, handler, delegationFn) {
+    addHandler(element, event, handler, delegationFn, false)
+  },
+
+  one(element, event, handler, delegationFn) {
+    addHandler(element, event, handler, delegationFn, true)
+  },
+
+  off(element, originalTypeEvent, handler, delegationFn) {
+    if (typeof originalTypeEvent !== 'string' || !element) {
+      return
+    }
+
+    const [delegation, originalHandler, typeEvent] = normalizeParams(originalTypeEvent, handler, delegationFn)
+    const inNamespace = typeEvent !== originalTypeEvent
+    const events = getEvent(element)
+    const isNamespace = originalTypeEvent.charAt(0) === '.'
+
+    if (typeof originalHandler !== 'undefined') {
+      // Simplest case: handler is passed, remove that listener ONLY.
+      if (!events || !events[typeEvent]) {
+        return
+      }
+
+      removeHandler(element, events, typeEvent, originalHandler, delegation ? handler : null)
+      return
+    }
+
+    if (isNamespace) {
+      Object.keys(events)
+        .forEach(elementEvent => {
+          removeNamespacedHandlers(element, events, elementEvent, originalTypeEvent.substr(1))
+        })
+    }
+
+    const storeElementEvent = events[typeEvent] || {}
+    Object.keys(storeElementEvent)
+      .forEach(keyHandlers => {
+        const handlerKey = keyHandlers.replace(stripUidRegex, '')
+
+        if (!inNamespace || originalTypeEvent.indexOf(handlerKey) > -1) {
+          const event = storeElementEvent[keyHandlers]
+
+          removeHandler(element, events, typeEvent, event.originalHandler, event.delegationSelector)
+        }
+      })
+  },
+
+  trigger(element, event, args) {
+    if (typeof event !== 'string' || !element) {
+      return null
+    }
+
+    const typeEvent = event.replace(stripNameRegex, '')
+    const inNamespace = event !== typeEvent
+    const isNative = nativeEvents.indexOf(typeEvent) > -1
+
+    let jQueryEvent
+    let bubbles = true
+    let nativeDispatch = true
+    let defaultPrevented = false
+    let evt = null
+
+    if (inNamespace && typeof $ !== 'undefined') {
+      jQueryEvent = $.Event(event, args)
+
+      $(element).trigger(jQueryEvent)
+      bubbles = !jQueryEvent.isPropagationStopped()
+      nativeDispatch = !jQueryEvent.isImmediatePropagationStopped()
+      defaultPrevented = jQueryEvent.isDefaultPrevented()
+    }
+
+    if (isNative) {
+      evt = document.createEvent('HTMLEvents')
+      evt.initEvent(typeEvent, bubbles, true)
+    } else {
+      evt = createCustomEvent(event, {
+        bubbles,
+        cancelable: true
+      })
+    }
+
+    // merge custom informations in our event
+    if (typeof args !== 'undefined') {
+      Object.keys(args)
+        .forEach(key => {
+          Object.defineProperty(evt, key, {
+            get() {
+              return args[key]
+            }
+          })
+        })
+    }
+
+    if (defaultPrevented) {
+      evt.preventDefault()
+
+      if (!defaultPreventedPreservedOnDispatch) {
+        Object.defineProperty(evt, 'defaultPrevented', {
+          get: () => true
+        })
+      }
+    }
+
+    if (nativeDispatch) {
+      element.dispatchEvent(evt)
+    }
+
+    if (evt.defaultPrevented && typeof jQueryEvent !== 'undefined') {
+      jQueryEvent.preventDefault()
+    }
+
+    return evt
+  }
+}
+
+export default EventHandler