TypeScript kernel.Tracer類代碼示例

function createElementForTag<T extends INode>(dom: IDOM<T>, tagName: string, props?: Record<string, string | HTMLTargetedInstruction>, children?: ArrayLike<unknown>): RenderPlan<T> {
  if (Tracer.enabled) { Tracer.enter('createElement', 'createElementForTag', slice.call(arguments)); }
  const instructions: HTMLTargetedInstruction[] = [];
  const allInstructions: HTMLTargetedInstruction[][] = [];
  const dependencies: IRegistry[] = [];
  const element = dom.createElement(tagName);
  let hasInstructions = false;

  if (props) {
    Object.keys(props)
      .forEach(to => {
        const value = props[to];

        if (isHTMLTargetedInstruction(value)) {
          hasInstructions = true;
          instructions.push(value);
        } else {
          dom.setAttribute(element, to, value);
        }
      });
  }

  if (hasInstructions) {
    dom.makeTarget(element);
    allInstructions.push(instructions);
  }

  if (children) {
    addChildren(dom, element, children, allInstructions, dependencies);
  }

  if (Tracer.enabled) { Tracer.leave(); }
  return new RenderPlan(dom, element, allInstructions, dependencies);
}

  public $bind(flags: LifecycleFlags, scope: IScope): void {
    if (Tracer.enabled) { Tracer.enter('Listener', '$bind', slice.call(arguments)); }
    if (this.$state & State.isBound) {
      if (this.$scope === scope) {
        if (Tracer.enabled) { Tracer.leave(); }
        return;
      }

      this.$unbind(flags | LifecycleFlags.fromBind);
    }
    // add isBinding flag
    this.$state |= State.isBinding;

    this.$scope = scope;

    const sourceExpression = this.sourceExpression;
    if (hasBind(sourceExpression)) {
      sourceExpression.bind(flags, scope, this);
    }

    this.handler = this.eventManager.addEventListener(
      this.dom,
      this.target,
      this.targetEvent,
      this,
      this.delegationStrategy
    );

    // add isBound flag and remove isBinding flag
    this.$state |= State.isBound;
    this.$state &= ~State.isBinding;
    if (Tracer.enabled) { Tracer.leave(); }
  }

  public $unbind(flags: LifecycleFlags): void {
    if (Tracer.enabled) { Tracer.enter('Binding', '$unbind', slice.call(arguments)); }
    if (!(this.$state & State.isBound)) {
      if (Tracer.enabled) { Tracer.leave(); }
      return;
    }
    // add isUnbinding flag
    this.$state |= State.isUnbinding;

    // clear persistent flags
    this.persistentFlags = LifecycleFlags.none;

    if (hasUnbind(this.sourceExpression)) {
      this.sourceExpression.unbind(flags, this.$scope, this);
    }
    this.$scope = null;

    if ((this.targetObserver as IBindingTargetObserver).unbind) {
      (this.targetObserver as IBindingTargetObserver).unbind(flags);
    }
    if ((this.targetObserver as IBindingTargetObserver).unsubscribe) {
      (this.targetObserver as IBindingTargetObserver).unsubscribe(this);
      this.targetObserver[this.id] &= ~LifecycleFlags.updateSourceExpression;
    }
    this.unobserve(true);

    // remove isBound and isUnbinding flags
    this.$state &= ~(State.isBound | State.isUnbinding);
    if (Tracer.enabled) { Tracer.leave(); }
  }

  public $bind(flags: LifecycleFlags, scope: IScope): void {
    if (Tracer.enabled) { Tracer.enter('Ref', '$bind', slice.call(arguments)); }
    if (this.$state & State.isBound) {
      if (this.$scope === scope) {
        if (Tracer.enabled) { Tracer.leave(); }
        return;
      }

      this.$unbind(flags | LifecycleFlags.fromBind);
    }
    // add isBinding flag
    this.$state |= State.isBinding;

    this.$scope = scope;

    if (hasBind(this.sourceExpression)) {
      this.sourceExpression.bind(flags, scope, this);
    }

    this.sourceExpression.assign(flags, this.$scope, this.locator, this.target);

    // add isBound flag and remove isBinding flag
    this.$state |= State.isBound;
    this.$state &= ~State.isBinding;
    if (Tracer.enabled) { Tracer.leave(); }
  }

  public $bind(flags: LifecycleFlags, scope: IScope): void {
    if (Tracer.enabled) { Tracer.enter('LetBinding', '$bind', slice.call(arguments)); }
    if (this.$state & State.isBound) {
      if (this.$scope === scope) {
        if (Tracer.enabled) { Tracer.leave(); }
        return;
      }
      this.$unbind(flags | LifecycleFlags.fromBind);
    }
    // add isBinding flag
    this.$state |= State.isBinding;

    this.$scope = scope;
    this.target = (this.toViewModel ? scope.bindingContext : scope.overrideContext) as IIndexable;

    const sourceExpression = this.sourceExpression;
    if (sourceExpression.bind) {
      sourceExpression.bind(flags, scope, this);
    }
    // sourceExpression might have been changed during bind
    this.target[this.targetProperty] = this.sourceExpression.evaluate(LifecycleFlags.fromBind, scope, this.locator);
    this.sourceExpression.connect(flags, scope, this);

    // add isBound flag and remove isBinding flag
    this.$state |= State.isBound;
    this.$state &= ~State.isBinding;
    if (Tracer.enabled) { Tracer.leave(); }
  }

export function $attachAttribute(this: Writable<IAttachable>, flags: LifecycleFlags): void {
  if (Profiler.enabled) { enter(); }
  if (Tracer.enabled) { Tracer.enter(this.constructor.description && this.constructor.description.name || this.constructor.name, '$attach', slice.call(arguments)); }
  if (this.$state & State.isAttached) {
    if (Profiler.enabled) { leave(); }
    if (Tracer.enabled) { Tracer.leave(); }
    return;
  }
  const lifecycle = this.$lifecycle;
  lifecycle.beginAttach();
  // add isAttaching flag
  this.$state |= State.isAttaching;
  flags |= LifecycleFlags.fromAttach;

  const hooks = this.$hooks;

  if (hooks & Hooks.hasAttaching) {
    this.attaching(flags);
  }

  // add isAttached flag, remove isAttaching flag
  this.$state |= State.isAttached;
  this.$state &= ~State.isAttaching;

  if (hooks & Hooks.hasAttached) {
    lifecycle.enqueueAttached(this as Required<typeof this>);
  }
  lifecycle.endAttach(flags);
  if (Profiler.enabled) { leave(); }
  if (Tracer.enabled) { Tracer.leave(); }
}

export function $lockedBind(this: IBindable, flags: LifecycleFlags): void {
  if (Tracer.enabled) { Tracer.enter('IView', 'lockedBind', slice.call(arguments)); }
  flags |= LifecycleFlags.fromBind;

  if (this.$state & State.isBound) {
    if (Tracer.enabled) { Tracer.leave(); }
    return;
  }
  // add isBinding flag
  this.$state |= State.isBinding;

  const scope = this.$scope;

  let binding = this.$bindingHead;
  while (binding !== null) {
    binding.$bind(flags, scope);
    binding = binding.$nextBinding;
  }

  let component = this.$componentHead;
  while (component !== null) {
    component.$bind(flags, scope);
    component = component.$nextComponent;
  }

  // add isBound flag and remove isBinding flag
  this.$state |= State.isBound;
  this.$state &= ~State.isBinding;
  if (Tracer.enabled) { Tracer.leave(); }
}

export function $unbindAttribute(this: Writable<IBindable>, flags: LifecycleFlags): void {
  if (Tracer.enabled) { Tracer.enter(this.constructor.description && this.constructor.description.name || this.constructor.name, '$bind', slice.call(arguments)); }
  if (this.$state & State.isBound) {
    const lifecycle = this.$lifecycle;
    lifecycle.beginUnbind();
    // add isUnbinding flag
    this.$state |= State.isUnbinding;

    const hooks = this.$hooks;
    flags |= LifecycleFlags.fromUnbind;

    if (hooks & Hooks.hasUnbound) {
      lifecycle.enqueueUnbound(this);
    }

    if (hooks & Hooks.hasUnbinding) {
      this.unbinding(flags);
    }

    // remove isBound and isUnbinding flags
    this.$state &= ~(State.isBound | State.isUnbinding);

    lifecycle.endUnbind(flags);
  }
  if (Tracer.enabled) { Tracer.leave(); }
}

  private bindChildNodes(node: HTMLTemplateElement | HTMLElement): void {
    if (Tracer.enabled) { Tracer.enter('TemplateBinder', 'bindChildNodes', slice.call(arguments)); }

    let childNode: ChildNode;
    if (node.nodeName === 'TEMPLATE') {
      childNode = (node as HTMLTemplateElement).content.firstChild;
    } else {
      childNode = node.firstChild;
    }

    let nextChild: ChildNode;
    while (childNode !== null) {
      switch (childNode.nodeType) {
        case NodeType.Element:
          nextChild = childNode.nextSibling as ChildNode;
          this.bindManifest(this.manifest, childNode as HTMLElement);
          childNode = nextChild;
          break;
        case NodeType.Text:
          childNode = this.bindText(childNode as Text).nextSibling as ChildNode;
          break;
        case NodeType.CDATASection:
        case NodeType.ProcessingInstruction:
        case NodeType.Comment:
        case NodeType.DocumentType:
          childNode = childNode.nextSibling as ChildNode;
          break;
        case NodeType.Document:
        case NodeType.DocumentFragment:
          childNode = childNode.firstChild;
      }
    }

    if (Tracer.enabled) { Tracer.leave(); }
  }

export function $detachView(this: Writable<IAttachable & IMountableComponent>, flags: LifecycleFlags): void {
  if (Tracer.enabled) { Tracer.enter('IView', '$detach', slice.call(arguments)); }
  if (this.$state & State.isAttached) {
    // add isDetaching flag
    this.$state |= State.isDetaching;
    flags |= LifecycleFlags.fromDetach;

    // Only unmount if either:
    // - No parent view/element is queued for unmount yet, or
    // - Aurelia is stopping (in which case all nodes need to return to their fragments for a clean mount on next start)
    if (((flags & LifecycleFlags.parentUnmountQueued) ^ LifecycleFlags.parentUnmountQueued) | (flags & LifecycleFlags.fromStopTask)) {
      this.$lifecycle.enqueueUnmount(this);
      flags |= LifecycleFlags.parentUnmountQueued;
    }

    let current = this.$componentTail;
    while (current !== null) {
      current.$detach(flags);
      current = current.$prevComponent;
    }

    // remove isAttached and isDetaching flags
    this.$state &= ~(State.isAttached | State.isDetaching);
  }
  if (Tracer.enabled) { Tracer.leave(); }
}