/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { assertTNodeForLView } from '../render3/assert';
import { getLContext } from '../render3/context_discovery';
import { CONTAINER_HEADER_OFFSET, NATIVE } from '../render3/interfaces/container';
import { isComponentHost, isLContainer } from '../render3/interfaces/type_checks';
import { DECLARATION_COMPONENT_VIEW, PARENT, T_HOST, TVIEW } from '../render3/interfaces/view';
import { getComponent, getContext, getInjectionTokens, getInjector, getListeners, getLocalRefs, getOwningComponent } from '../render3/util/discovery_utils';
import { INTERPOLATION_DELIMITER } from '../render3/util/misc_utils';
import { renderStringify } from '../render3/util/stringify_utils';
import { getComponentLViewByIndex, getNativeByTNodeOrNull } from '../render3/util/view_utils';
import { assertDomNode } from '../util/assert';
/**
 * @publicApi
 */
export class DebugEventListener {
    constructor(name, callback) {
        this.name = name;
        this.callback = callback;
    }
}
/**
 * @publicApi
 */
export function asNativeElements(debugEls) {
    return debugEls.map((el) => el.nativeElement);
}
/**
 * @publicApi
 */
export class DebugNode {
    constructor(nativeNode) {
        this.nativeNode = nativeNode;
    }
    /**
     * The `DebugElement` parent. Will be `null` if this is the root element.
     */
    get parent() {
        const parent = this.nativeNode.parentNode;
        return parent ? new DebugElement(parent) : null;
    }
    /**
     * The host dependency injector. For example, the root element's component instance injector.
     */
    get injector() {
        return getInjector(this.nativeNode);
    }
    /**
     * The element's own component instance, if it has one.
     */
    get componentInstance() {
        const nativeElement = this.nativeNode;
        return nativeElement &&
            (getComponent(nativeElement) || getOwningComponent(nativeElement));
    }
    /**
     * An object that provides parent context for this element. Often an ancestor component instance
     * that governs this element.
     *
     * When an element is repeated within *ngFor, the context is an `NgForOf` whose `$implicit`
     * property is the value of the row instance value. For example, the `hero` in `*ngFor="let hero
     * of heroes"`.
     */
    get context() {
        return getComponent(this.nativeNode) || getContext(this.nativeNode);
    }
    /**
     * The callbacks attached to the component's @Output properties and/or the element's event
     * properties.
     */
    get listeners() {
        return getListeners(this.nativeNode).filter(listener => listener.type === 'dom');
    }
    /**
     * Dictionary of objects associated with template local variables (e.g. #foo), keyed by the local
     * variable name.
     */
    get references() {
        return getLocalRefs(this.nativeNode);
    }
    /**
     * This component's injector lookup tokens. Includes the component itself plus the tokens that the
     * component lists in its providers metadata.
     */
    get providerTokens() {
        return getInjectionTokens(this.nativeNode);
    }
}
/**
 * @publicApi
 *
 * @see [Component testing scenarios](guide/testing-components-scenarios)
 * @see [Basics of testing components](guide/testing-components-basics)
 * @see [Testing utility APIs](guide/testing-utility-apis)
 */
export class DebugElement extends DebugNode {
    constructor(nativeNode) {
        ngDevMode && assertDomNode(nativeNode);
        super(nativeNode);
    }
    /**
     * The underlying DOM element at the root of the component.
     */
    get nativeElement() {
        return this.nativeNode.nodeType == Node.ELEMENT_NODE ? this.nativeNode : null;
    }
    /**
     * The element tag name, if it is an element.
     */
    get name() {
        const context = getLContext(this.nativeNode);
        const lView = context ? context.lView : null;
        if (lView !== null) {
            const tData = lView[TVIEW].data;
            const tNode = tData[context.nodeIndex];
            return tNode.value;
        }
        else {
            return this.nativeNode.nodeName;
        }
    }
    /**
     *  Gets a map of property names to property values for an element.
     *
     *  This map includes:
     *  - Regular property bindings (e.g. `[id]="id"`)
     *  - Host property bindings (e.g. `host: { '[id]': "id" }`)
     *  - Interpolated property bindings (e.g. `id="{{ value }}")
     *
     *  It does not include:
     *  - input property bindings (e.g. `[myCustomInput]="value"`)
     *  - attribute bindings (e.g. `[attr.role]="menu"`)
     */
    get properties() {
        const context = getLContext(this.nativeNode);
        const lView = context ? context.lView : null;
        if (lView === null) {
            return {};
        }
        const tData = lView[TVIEW].data;
        const tNode = tData[context.nodeIndex];
        const properties = {};
        // Collect properties from the DOM.
        copyDomProperties(this.nativeElement, properties);
        // Collect properties from the bindings. This is needed for animation renderer which has
        // synthetic properties which don't get reflected into the DOM.
        collectPropertyBindings(properties, tNode, lView, tData);
        return properties;
    }
    /**
     *  A map of attribute names to attribute values for an element.
     */
    get attributes() {
        const attributes = {};
        const element = this.nativeElement;
        if (!element) {
            return attributes;
        }
        const context = getLContext(element);
        const lView = context ? context.lView : null;
        if (lView === null) {
            return {};
        }
        const tNodeAttrs = lView[TVIEW].data[context.nodeIndex].attrs;
        const lowercaseTNodeAttrs = [];
        // For debug nodes we take the element's attribute directly from the DOM since it allows us
        // to account for ones that weren't set via bindings (e.g. ViewEngine keeps track of the ones
        // that are set through `Renderer2`). The problem is that the browser will lowercase all names,
        // however since we have the attributes already on the TNode, we can preserve the case by going
        // through them once, adding them to the `attributes` map and putting their lower-cased name
        // into an array. Afterwards when we're going through the native DOM attributes, we can check
        // whether we haven't run into an attribute already through the TNode.
        if (tNodeAttrs) {
            let i = 0;
            while (i < tNodeAttrs.length) {
                const attrName = tNodeAttrs[i];
                // Stop as soon as we hit a marker. We only care about the regular attributes. Everything
                // else will be handled below when we read the final attributes off the DOM.
                if (typeof attrName !== 'string')
                    break;
                const attrValue = tNodeAttrs[i + 1];
                attributes[attrName] = attrValue;
                lowercaseTNodeAttrs.push(attrName.toLowerCase());
                i += 2;
            }
        }
        const eAttrs = element.attributes;
        for (let i = 0; i < eAttrs.length; i++) {
            const attr = eAttrs[i];
            const lowercaseName = attr.name.toLowerCase();
            // Make sure that we don't assign the same attribute both in its
            // case-sensitive form and the lower-cased one from the browser.
            if (lowercaseTNodeAttrs.indexOf(lowercaseName) === -1) {
                // Save the lowercase name to align the behavior between browsers.
                // IE preserves the case, while all other browser convert it to lower case.
                attributes[lowercaseName] = attr.value;
            }
        }
        return attributes;
    }
    /**
     * The inline styles of the DOM element.
     *
     * Will be `null` if there is no `style` property on the underlying DOM element.
     *
     * @see [ElementCSSInlineStyle](https://developer.mozilla.org/en-US/docs/Web/API/ElementCSSInlineStyle/style)
     */
    get styles() {
        if (this.nativeElement && this.nativeElement.style) {
            return this.nativeElement.style;
        }
        return {};
    }
    /**
     * A map containing the class names on the element as keys.
     *
     * This map is derived from the `className` property of the DOM element.
     *
     * Note: The values of this object will always be `true`. The class key will not appear in the KV
     * object if it does not exist on the element.
     *
     * @see [Element.className](https://developer.mozilla.org/en-US/docs/Web/API/Element/className)
     */
    get classes() {
        const result = {};
        const element = this.nativeElement;
        // SVG elements return an `SVGAnimatedString` instead of a plain string for the `className`.
        const className = element.className;
        const classes = typeof className !== 'string' ? className.baseVal.split(' ') : className.split(' ');
        classes.forEach((value) => result[value] = true);
        return result;
    }
    /**
     * The `childNodes` of the DOM element as a `DebugNode` array.
     *
     * @see [Node.childNodes](https://developer.mozilla.org/en-US/docs/Web/API/Node/childNodes)
     */
    get childNodes() {
        const childNodes = this.nativeNode.childNodes;
        const children = [];
        for (let i = 0; i < childNodes.length; i++) {
            const element = childNodes[i];
            children.push(getDebugNode(element));
        }
        return children;
    }
    /**
     * The immediate `DebugElement` children. Walk the tree by descending through `children`.
     */
    get children() {
        const nativeElement = this.nativeElement;
        if (!nativeElement)
            return [];
        const childNodes = nativeElement.children;
        const children = [];
        for (let i = 0; i < childNodes.length; i++) {
            const element = childNodes[i];
            children.push(getDebugNode(element));
        }
        return children;
    }
    /**
     * @returns the first `DebugElement` that matches the predicate at any depth in the subtree.
     */
    query(predicate) {
        const results = this.queryAll(predicate);
        return results[0] || null;
    }
    /**
     * @returns All `DebugElement` matches for the predicate at any depth in the subtree.
     */
    queryAll(predicate) {
        const matches = [];
        _queryAll(this, predicate, matches, true);
        return matches;
    }
    /**
     * @returns All `DebugNode` matches for the predicate at any depth in the subtree.
     */
    queryAllNodes(predicate) {
        const matches = [];
        _queryAll(this, predicate, matches, false);
        return matches;
    }
    /**
     * Triggers the event by its name if there is a corresponding listener in the element's
     * `listeners` collection.
     *
     * If the event lacks a listener or there's some other problem, consider
     * calling `nativeElement.dispatchEvent(eventObject)`.
     *
     * @param eventName The name of the event to trigger
     * @param eventObj The _event object_ expected by the handler
     *
     * @see [Testing components scenarios](guide/testing-components-scenarios#trigger-event-handler)
     */
    triggerEventHandler(eventName, eventObj) {
        const node = this.nativeNode;
        const invokedListeners = [];
        this.listeners.forEach(listener => {
            if (listener.name === eventName) {
                const callback = listener.callback;
                callback.call(node, eventObj);
                invokedListeners.push(callback);
            }
        });
        // We need to check whether `eventListeners` exists, because it's something
        // that Zone.js only adds to `EventTarget` in browser environments.
        if (typeof node.eventListeners === 'function') {
            // Note that in Ivy we wrap event listeners with a call to `event.preventDefault` in some
            // cases. We use '__ngUnwrap__' as a special token that gives us access to the actual event
            // listener.
            node.eventListeners(eventName).forEach((listener) => {
                // In order to ensure that we can detect the special __ngUnwrap__ token described above, we
                // use `toString` on the listener and see if it contains the token. We use this approach to
                // ensure that it still worked with compiled code since it cannot remove or rename string
                // literals. We also considered using a special function name (i.e. if(listener.name ===
                // special)) but that was more cumbersome and we were also concerned the compiled code could
                // strip the name, turning the condition in to ("" === "") and always returning true.
                if (listener.toString().indexOf('__ngUnwrap__') !== -1) {
                    const unwrappedListener = listener('__ngUnwrap__');
                    return invokedListeners.indexOf(unwrappedListener) === -1 &&
                        unwrappedListener.call(node, eventObj);
                }
            });
        }
    }
}
function copyDomProperties(element, properties) {
    if (element) {
        // Skip own properties (as those are patched)
        let obj = Object.getPrototypeOf(element);
        const NodePrototype = Node.prototype;
        while (obj !== null && obj !== NodePrototype) {
            const descriptors = Object.getOwnPropertyDescriptors(obj);
            for (let key in descriptors) {
                if (!key.startsWith('__') && !key.startsWith('on')) {
                    // don't include properties starting with `__` and `on`.
                    // `__` are patched values which should not be included.
                    // `on` are listeners which also should not be included.
                    const value = element[key];
                    if (isPrimitiveValue(value)) {
                        properties[key] = value;
                    }
                }
            }
            obj = Object.getPrototypeOf(obj);
        }
    }
}
function isPrimitiveValue(value) {
    return typeof value === 'string' || typeof value === 'boolean' || typeof value === 'number' ||
        value === null;
}
function _queryAll(parentElement, predicate, matches, elementsOnly) {
    const context = getLContext(parentElement.nativeNode);
    const lView = context ? context.lView : null;
    if (lView !== null) {
        const parentTNode = lView[TVIEW].data[context.nodeIndex];
        _queryNodeChildren(parentTNode, lView, predicate, matches, elementsOnly, parentElement.nativeNode);
    }
    else {
        // If the context is null, then `parentElement` was either created with Renderer2 or native DOM
        // APIs.
        _queryNativeNodeDescendants(parentElement.nativeNode, predicate, matches, elementsOnly);
    }
}
/**
 * Recursively match the current TNode against the predicate, and goes on with the next ones.
 *
 * @param tNode the current TNode
 * @param lView the LView of this TNode
 * @param predicate the predicate to match
 * @param matches the list of positive matches
 * @param elementsOnly whether only elements should be searched
 * @param rootNativeNode the root native node on which predicate should not be matched
 */
function _queryNodeChildren(tNode, lView, predicate, matches, elementsOnly, rootNativeNode) {
    ngDevMode && assertTNodeForLView(tNode, lView);
    const nativeNode = getNativeByTNodeOrNull(tNode, lView);
    // For each type of TNode, specific logic is executed.
    if (tNode.type & (3 /* TNodeType.AnyRNode */ | 8 /* TNodeType.ElementContainer */)) {
        // Case 1: the TNode is an element
        // The native node has to be checked.
        _addQueryMatch(nativeNode, predicate, matches, elementsOnly, rootNativeNode);
        if (isComponentHost(tNode)) {
            // If the element is the host of a component, then all nodes in its view have to be processed.
            // Note: the component's content (tNode.child) will be processed from the insertion points.
            const componentView = getComponentLViewByIndex(tNode.index, lView);
            if (componentView && componentView[TVIEW].firstChild) {
                _queryNodeChildren(componentView[TVIEW].firstChild, componentView, predicate, matches, elementsOnly, rootNativeNode);
            }
        }
        else {
            if (tNode.child) {
                // Otherwise, its children have to be processed.
                _queryNodeChildren(tNode.child, lView, predicate, matches, elementsOnly, rootNativeNode);
            }
            // We also have to query the DOM directly in order to catch elements inserted through
            // Renderer2. Note that this is __not__ optimal, because we're walking similar trees multiple
            // times. ViewEngine could do it more efficiently, because all the insertions go through
            // Renderer2, however that's not the case in Ivy. This approach is being used because:
            // 1. Matching the ViewEngine behavior would mean potentially introducing a dependency
            //    from `Renderer2` to Ivy which could bring Ivy code into ViewEngine.
            // 2. It allows us to capture nodes that were inserted directly via the DOM.
            nativeNode && _queryNativeNodeDescendants(nativeNode, predicate, matches, elementsOnly);
        }
        // In all cases, if a dynamic container exists for this node, each view inside it has to be
        // processed.
        const nodeOrContainer = lView[tNode.index];
        if (isLContainer(nodeOrContainer)) {
            _queryNodeChildrenInContainer(nodeOrContainer, predicate, matches, elementsOnly, rootNativeNode);
        }
    }
    else if (tNode.type & 4 /* TNodeType.Container */) {
        // Case 2: the TNode is a container
        // The native node has to be checked.
        const lContainer = lView[tNode.index];
        _addQueryMatch(lContainer[NATIVE], predicate, matches, elementsOnly, rootNativeNode);
        // Each view inside the container has to be processed.
        _queryNodeChildrenInContainer(lContainer, predicate, matches, elementsOnly, rootNativeNode);
    }
    else if (tNode.type & 16 /* TNodeType.Projection */) {
        // Case 3: the TNode is a projection insertion point (i.e. a <ng-content>).
        // The nodes projected at this location all need to be processed.
        const componentView = lView[DECLARATION_COMPONENT_VIEW];
        const componentHost = componentView[T_HOST];
        const head = componentHost.projection[tNode.projection];
        if (Array.isArray(head)) {
            for (let nativeNode of head) {
                _addQueryMatch(nativeNode, predicate, matches, elementsOnly, rootNativeNode);
            }
        }
        else if (head) {
            const nextLView = componentView[PARENT];
            const nextTNode = nextLView[TVIEW].data[head.index];
            _queryNodeChildren(nextTNode, nextLView, predicate, matches, elementsOnly, rootNativeNode);
        }
    }
    else if (tNode.child) {
        // Case 4: the TNode is a view.
        _queryNodeChildren(tNode.child, lView, predicate, matches, elementsOnly, rootNativeNode);
    }
    // We don't want to go to the next sibling of the root node.
    if (rootNativeNode !== nativeNode) {
        // To determine the next node to be processed, we need to use the next or the projectionNext
        // link, depending on whether the current node has been projected.
        const nextTNode = (tNode.flags & 4 /* TNodeFlags.isProjected */) ? tNode.projectionNext : tNode.next;
        if (nextTNode) {
            _queryNodeChildren(nextTNode, lView, predicate, matches, elementsOnly, rootNativeNode);
        }
    }
}
/**
 * Process all TNodes in a given container.
 *
 * @param lContainer the container to be processed
 * @param predicate the predicate to match
 * @param matches the list of positive matches
 * @param elementsOnly whether only elements should be searched
 * @param rootNativeNode the root native node on which predicate should not be matched
 */
function _queryNodeChildrenInContainer(lContainer, predicate, matches, elementsOnly, rootNativeNode) {
    for (let i = CONTAINER_HEADER_OFFSET; i < lContainer.length; i++) {
        const childView = lContainer[i];
        const firstChild = childView[TVIEW].firstChild;
        if (firstChild) {
            _queryNodeChildren(firstChild, childView, predicate, matches, elementsOnly, rootNativeNode);
        }
    }
}
/**
 * Match the current native node against the predicate.
 *
 * @param nativeNode the current native node
 * @param predicate the predicate to match
 * @param matches the list of positive matches
 * @param elementsOnly whether only elements should be searched
 * @param rootNativeNode the root native node on which predicate should not be matched
 */
function _addQueryMatch(nativeNode, predicate, matches, elementsOnly, rootNativeNode) {
    if (rootNativeNode !== nativeNode) {
        const debugNode = getDebugNode(nativeNode);
        if (!debugNode) {
            return;
        }
        // Type of the "predicate and "matches" array are set based on the value of
        // the "elementsOnly" parameter. TypeScript is not able to properly infer these
        // types with generics, so we manually cast the parameters accordingly.
        if (elementsOnly && (debugNode instanceof DebugElement) && predicate(debugNode) &&
            matches.indexOf(debugNode) === -1) {
            matches.push(debugNode);
        }
        else if (!elementsOnly && predicate(debugNode) &&
            matches.indexOf(debugNode) === -1) {
            matches.push(debugNode);
        }
    }
}
/**
 * Match all the descendants of a DOM node against a predicate.
 *
 * @param nativeNode the current native node
 * @param predicate the predicate to match
 * @param matches the list where matches are stored
 * @param elementsOnly whether only elements should be searched
 */
function _queryNativeNodeDescendants(parentNode, predicate, matches, elementsOnly) {
    const nodes = parentNode.childNodes;
    const length = nodes.length;
    for (let i = 0; i < length; i++) {
        const node = nodes[i];
        const debugNode = getDebugNode(node);
        if (debugNode) {
            if (elementsOnly && (debugNode instanceof DebugElement) && predicate(debugNode) &&
                matches.indexOf(debugNode) === -1) {
                matches.push(debugNode);
            }
            else if (!elementsOnly && predicate(debugNode) &&
                matches.indexOf(debugNode) === -1) {
                matches.push(debugNode);
            }
            _queryNativeNodeDescendants(node, predicate, matches, elementsOnly);
        }
    }
}
/**
 * Iterates through the property bindings for a given node and generates
 * a map of property names to values. This map only contains property bindings
 * defined in templates, not in host bindings.
 */
function collectPropertyBindings(properties, tNode, lView, tData) {
    let bindingIndexes = tNode.propertyBindings;
    if (bindingIndexes !== null) {
        for (let i = 0; i < bindingIndexes.length; i++) {
            const bindingIndex = bindingIndexes[i];
            const propMetadata = tData[bindingIndex];
            const metadataParts = propMetadata.split(INTERPOLATION_DELIMITER);
            const propertyName = metadataParts[0];
            if (metadataParts.length > 1) {
                let value = metadataParts[1];
                for (let j = 1; j < metadataParts.length - 1; j++) {
                    value += renderStringify(lView[bindingIndex + j - 1]) + metadataParts[j + 1];
                }
                properties[propertyName] = value;
            }
            else {
                properties[propertyName] = lView[bindingIndex];
            }
        }
    }
}
// Need to keep the nodes in a global Map so that multiple angular apps are supported.
const _nativeNodeToDebugNode = new Map();
const NG_DEBUG_PROPERTY = '__ng_debug__';
/**
 * @publicApi
 */
export function getDebugNode(nativeNode) {
    if (nativeNode instanceof Node) {
        if (!(nativeNode.hasOwnProperty(NG_DEBUG_PROPERTY))) {
            nativeNode[NG_DEBUG_PROPERTY] = nativeNode.nodeType == Node.ELEMENT_NODE ?
                new DebugElement(nativeNode) :
                new DebugNode(nativeNode);
        }
        return nativeNode[NG_DEBUG_PROPERTY];
    }
    return null;
}
// TODO: cleanup all references to this function and remove it.
export function getDebugNodeR2(_nativeNode) {
    return null;
}
export function getAllDebugNodes() {
    return Array.from(_nativeNodeToDebugNode.values());
}
export function indexDebugNode(node) {
    _nativeNodeToDebugNode.set(node.nativeNode, node);
}
export function removeDebugNodeFromIndex(node) {
    _nativeNodeToDebugNode.delete(node.nativeNode);
}
//# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Injector} from '../di/injector';\nimport {assertTNodeForLView} from '../render3/assert';\nimport {getLContext} from '../render3/context_discovery';\nimport {CONTAINER_HEADER_OFFSET, LContainer, NATIVE} from '../render3/interfaces/container';\nimport {TElementNode, TNode, TNodeFlags, TNodeType} from '../render3/interfaces/node';\nimport {isComponentHost, isLContainer} from '../render3/interfaces/type_checks';\nimport {DECLARATION_COMPONENT_VIEW, LView, PARENT, T_HOST, TData, TVIEW} from '../render3/interfaces/view';\nimport {getComponent, getContext, getInjectionTokens, getInjector, getListeners, getLocalRefs, getOwningComponent} from '../render3/util/discovery_utils';\nimport {INTERPOLATION_DELIMITER} from '../render3/util/misc_utils';\nimport {renderStringify} from '../render3/util/stringify_utils';\nimport {getComponentLViewByIndex, getNativeByTNodeOrNull} from '../render3/util/view_utils';\nimport {assertDomNode} from '../util/assert';\n\n/**\n * @publicApi\n */\nexport class DebugEventListener {\n  constructor(public name: string, public callback: Function) {}\n}\n\n/**\n * @publicApi\n */\nexport function asNativeElements(debugEls: DebugElement[]): any {\n  return debugEls.map((el) => el.nativeElement);\n}\n\n/**\n * @publicApi\n */\nexport class DebugNode {\n  /**\n   * The underlying DOM node.\n   */\n  readonly nativeNode: any;\n\n  constructor(nativeNode: Node) {\n    this.nativeNode = nativeNode;\n  }\n\n  /**\n   * The `DebugElement` parent. Will be `null` if this is the root element.\n   */\n  get parent(): DebugElement|null {\n    const parent = this.nativeNode.parentNode as Element;\n    return parent ? new DebugElement(parent) : null;\n  }\n\n  /**\n   * The host dependency injector. For example, the root element's component instance injector.\n   */\n  get injector(): Injector {\n    return getInjector(this.nativeNode);\n  }\n\n  /**\n   * The element's own component instance, if it has one.\n   */\n  get componentInstance(): any {\n    const nativeElement = this.nativeNode;\n    return nativeElement &&\n        (getComponent(nativeElement as Element) || getOwningComponent(nativeElement));\n  }\n\n  /**\n   * An object that provides parent context for this element. Often an ancestor component instance\n   * that governs this element.\n   *\n   * When an element is repeated within *ngFor, the context is an `NgForOf` whose `$implicit`\n   * property is the value of the row instance value. For example, the `hero` in `*ngFor=\"let hero\n   * of heroes\"`.\n   */\n  get context(): any {\n    return getComponent(this.nativeNode as Element) || getContext(this.nativeNode as Element);\n  }\n\n  /**\n   * The callbacks attached to the component's @Output properties and/or the element's event\n   * properties.\n   */\n  get listeners(): DebugEventListener[] {\n    return getListeners(this.nativeNode as Element).filter(listener => listener.type === 'dom');\n  }\n\n  /**\n   * Dictionary of objects associated with template local variables (e.g. #foo), keyed by the local\n   * variable name.\n   */\n  get references(): {[key: string]: any} {\n    return getLocalRefs(this.nativeNode);\n  }\n\n  /**\n   * This component's injector lookup tokens. Includes the component itself plus the tokens that the\n   * component lists in its providers metadata.\n   */\n  get providerTokens(): any[] {\n    return getInjectionTokens(this.nativeNode as Element);\n  }\n}\n\n/**\n * @publicApi\n *\n * @see [Component testing scenarios](guide/testing-components-scenarios)\n * @see [Basics of testing components](guide/testing-components-basics)\n * @see [Testing utility APIs](guide/testing-utility-apis)\n */\nexport class DebugElement extends DebugNode {\n  constructor(nativeNode: Element) {\n    ngDevMode && assertDomNode(nativeNode);\n    super(nativeNode);\n  }\n\n  /**\n   * The underlying DOM element at the root of the component.\n   */\n  get nativeElement(): any {\n    return this.nativeNode.nodeType == Node.ELEMENT_NODE ? this.nativeNode as Element : null;\n  }\n\n  /**\n   * The element tag name, if it is an element.\n   */\n  get name(): string {\n    const context = getLContext(this.nativeNode)!;\n    const lView = context ? context.lView : null;\n\n    if (lView !== null) {\n      const tData = lView[TVIEW].data;\n      const tNode = tData[context.nodeIndex] as TNode;\n      return tNode.value!;\n    } else {\n      return this.nativeNode.nodeName;\n    }\n  }\n\n  /**\n   *  Gets a map of property names to property values for an element.\n   *\n   *  This map includes:\n   *  - Regular property bindings (e.g. `[id]=\"id\"`)\n   *  - Host property bindings (e.g. `host: { '[id]': \"id\" }`)\n   *  - Interpolated property bindings (e.g. `id=\"{{ value }}\")\n   *\n   *  It does not include:\n   *  - input property bindings (e.g. `[myCustomInput]=\"value\"`)\n   *  - attribute bindings (e.g. `[attr.role]=\"menu\"`)\n   */\n  get properties(): {[key: string]: any;} {\n    const context = getLContext(this.nativeNode)!;\n    const lView = context ? context.lView : null;\n\n    if (lView === null) {\n      return {};\n    }\n\n    const tData = lView[TVIEW].data;\n    const tNode = tData[context.nodeIndex] as TNode;\n\n    const properties: {[key: string]: string} = {};\n    // Collect properties from the DOM.\n    copyDomProperties(this.nativeElement, properties);\n    // Collect properties from the bindings. This is needed for animation renderer which has\n    // synthetic properties which don't get reflected into the DOM.\n    collectPropertyBindings(properties, tNode, lView, tData);\n    return properties;\n  }\n\n  /**\n   *  A map of attribute names to attribute values for an element.\n   */\n  get attributes(): {[key: string]: string|null} {\n    const attributes: {[key: string]: string|null} = {};\n    const element = this.nativeElement;\n\n    if (!element) {\n      return attributes;\n    }\n\n    const context = getLContext(element)!;\n    const lView = context ? context.lView : null;\n\n    if (lView === null) {\n      return {};\n    }\n\n    const tNodeAttrs = (lView[TVIEW].data[context.nodeIndex] as TNode).attrs;\n    const lowercaseTNodeAttrs: string[] = [];\n\n    // For debug nodes we take the element's attribute directly from the DOM since it allows us\n    // to account for ones that weren't set via bindings (e.g. ViewEngine keeps track of the ones\n    // that are set through `Renderer2`). The problem is that the browser will lowercase all names,\n    // however since we have the attributes already on the TNode, we can preserve the case by going\n    // through them once, adding them to the `attributes` map and putting their lower-cased name\n    // into an array. Afterwards when we're going through the native DOM attributes, we can check\n    // whether we haven't run into an attribute already through the TNode.\n    if (tNodeAttrs) {\n      let i = 0;\n      while (i < tNodeAttrs.length) {\n        const attrName = tNodeAttrs[i];\n\n        // Stop as soon as we hit a marker. We only care about the regular attributes. Everything\n        // else will be handled below when we read the final attributes off the DOM.\n        if (typeof attrName !== 'string') break;\n\n        const attrValue = tNodeAttrs[i + 1];\n        attributes[attrName] = attrValue as string;\n        lowercaseTNodeAttrs.push(attrName.toLowerCase());\n\n        i += 2;\n      }\n    }\n\n    const eAttrs = element.attributes;\n    for (let i = 0; i < eAttrs.length; i++) {\n      const attr = eAttrs[i];\n      const lowercaseName = attr.name.toLowerCase();\n\n      // Make sure that we don't assign the same attribute both in its\n      // case-sensitive form and the lower-cased one from the browser.\n      if (lowercaseTNodeAttrs.indexOf(lowercaseName) === -1) {\n        // Save the lowercase name to align the behavior between browsers.\n        // IE preserves the case, while all other browser convert it to lower case.\n        attributes[lowercaseName] = attr.value;\n      }\n    }\n\n    return attributes;\n  }\n\n  /**\n   * The inline styles of the DOM element.\n   *\n   * Will be `null` if there is no `style` property on the underlying DOM element.\n   *\n   * @see [ElementCSSInlineStyle](https://developer.mozilla.org/en-US/docs/Web/API/ElementCSSInlineStyle/style)\n   */\n  get styles(): {[key: string]: string|null} {\n    if (this.nativeElement && (this.nativeElement as HTMLElement).style) {\n      return (this.nativeElement as HTMLElement).style as {[key: string]: any};\n    }\n    return {};\n  }\n\n  /**\n   * A map containing the class names on the element as keys.\n   *\n   * This map is derived from the `className` property of the DOM element.\n   *\n   * Note: The values of this object will always be `true`. The class key will not appear in the KV\n   * object if it does not exist on the element.\n   *\n   * @see [Element.className](https://developer.mozilla.org/en-US/docs/Web/API/Element/className)\n   */\n  get classes(): {[key: string]: boolean} {\n    const result: {[key: string]: boolean} = {};\n    const element = this.nativeElement as HTMLElement | SVGElement;\n\n    // SVG elements return an `SVGAnimatedString` instead of a plain string for the `className`.\n    const className = element.className as string | SVGAnimatedString;\n    const classes =\n        typeof className !== 'string' ? className.baseVal.split(' ') : className.split(' ');\n\n    classes.forEach((value: string) => result[value] = true);\n\n    return result;\n  }\n\n  /**\n   * The `childNodes` of the DOM element as a `DebugNode` array.\n   *\n   * @see [Node.childNodes](https://developer.mozilla.org/en-US/docs/Web/API/Node/childNodes)\n   */\n  get childNodes(): DebugNode[] {\n    const childNodes = this.nativeNode.childNodes;\n    const children: DebugNode[] = [];\n    for (let i = 0; i < childNodes.length; i++) {\n      const element = childNodes[i];\n      children.push(getDebugNode(element)!);\n    }\n    return children;\n  }\n\n  /**\n   * The immediate `DebugElement` children. Walk the tree by descending through `children`.\n   */\n  get children(): DebugElement[] {\n    const nativeElement = this.nativeElement;\n    if (!nativeElement) return [];\n    const childNodes = nativeElement.children;\n    const children: DebugElement[] = [];\n    for (let i = 0; i < childNodes.length; i++) {\n      const element = childNodes[i];\n      children.push(getDebugNode(element) as DebugElement);\n    }\n    return children;\n  }\n\n  /**\n   * @returns the first `DebugElement` that matches the predicate at any depth in the subtree.\n   */\n  query(predicate: Predicate<DebugElement>): DebugElement {\n    const results = this.queryAll(predicate);\n    return results[0] || null;\n  }\n\n  /**\n   * @returns All `DebugElement` matches for the predicate at any depth in the subtree.\n   */\n  queryAll(predicate: Predicate<DebugElement>): DebugElement[] {\n    const matches: DebugElement[] = [];\n    _queryAll(this, predicate, matches, true);\n    return matches;\n  }\n\n  /**\n   * @returns All `DebugNode` matches for the predicate at any depth in the subtree.\n   */\n  queryAllNodes(predicate: Predicate<DebugNode>): DebugNode[] {\n    const matches: DebugNode[] = [];\n    _queryAll(this, predicate, matches, false);\n    return matches;\n  }\n\n  /**\n   * Triggers the event by its name if there is a corresponding listener in the element's\n   * `listeners` collection.\n   *\n   * If the event lacks a listener or there's some other problem, consider\n   * calling `nativeElement.dispatchEvent(eventObject)`.\n   *\n   * @param eventName The name of the event to trigger\n   * @param eventObj The _event object_ expected by the handler\n   *\n   * @see [Testing components scenarios](guide/testing-components-scenarios#trigger-event-handler)\n   */\n  triggerEventHandler(eventName: string, eventObj?: any): void {\n    const node = this.nativeNode as any;\n    const invokedListeners: Function[] = [];\n\n    this.listeners.forEach(listener => {\n      if (listener.name === eventName) {\n        const callback = listener.callback;\n        callback.call(node, eventObj);\n        invokedListeners.push(callback);\n      }\n    });\n\n    // We need to check whether `eventListeners` exists, because it's something\n    // that Zone.js only adds to `EventTarget` in browser environments.\n    if (typeof node.eventListeners === 'function') {\n      // Note that in Ivy we wrap event listeners with a call to `event.preventDefault` in some\n      // cases. We use '__ngUnwrap__' as a special token that gives us access to the actual event\n      // listener.\n      node.eventListeners(eventName).forEach((listener: Function) => {\n        // In order to ensure that we can detect the special __ngUnwrap__ token described above, we\n        // use `toString` on the listener and see if it contains the token. We use this approach to\n        // ensure that it still worked with compiled code since it cannot remove or rename string\n        // literals. We also considered using a special function name (i.e. if(listener.name ===\n        // special)) but that was more cumbersome and we were also concerned the compiled code could\n        // strip the name, turning the condition in to (\"\" === \"\") and always returning true.\n        if (listener.toString().indexOf('__ngUnwrap__') !== -1) {\n          const unwrappedListener = listener('__ngUnwrap__');\n          return invokedListeners.indexOf(unwrappedListener) === -1 &&\n              unwrappedListener.call(node, eventObj);\n        }\n      });\n    }\n  }\n}\n\nfunction copyDomProperties(element: Element|null, properties: {[name: string]: string}): void {\n  if (element) {\n    // Skip own properties (as those are patched)\n    let obj = Object.getPrototypeOf(element);\n    const NodePrototype: any = Node.prototype;\n    while (obj !== null && obj !== NodePrototype) {\n      const descriptors = Object.getOwnPropertyDescriptors(obj);\n      for (let key in descriptors) {\n        if (!key.startsWith('__') && !key.startsWith('on')) {\n          // don't include properties starting with `__` and `on`.\n          // `__` are patched values which should not be included.\n          // `on` are listeners which also should not be included.\n          const value = (element as any)[key];\n          if (isPrimitiveValue(value)) {\n            properties[key] = value;\n          }\n        }\n      }\n      obj = Object.getPrototypeOf(obj);\n    }\n  }\n}\n\nfunction isPrimitiveValue(value: any): boolean {\n  return typeof value === 'string' || typeof value === 'boolean' || typeof value === 'number' ||\n      value === null;\n}\n\n/**\n * Walk the TNode tree to find matches for the predicate.\n *\n * @param parentElement the element from which the walk is started\n * @param predicate the predicate to match\n * @param matches the list of positive matches\n * @param elementsOnly whether only elements should be searched\n */\nfunction _queryAll(\n    parentElement: DebugElement, predicate: Predicate<DebugElement>, matches: DebugElement[],\n    elementsOnly: true): void;\nfunction _queryAll(\n    parentElement: DebugElement, predicate: Predicate<DebugNode>, matches: DebugNode[],\n    elementsOnly: false): void;\nfunction _queryAll(\n    parentElement: DebugElement, predicate: Predicate<DebugElement>|Predicate<DebugNode>,\n    matches: DebugElement[]|DebugNode[], elementsOnly: boolean) {\n  const context = getLContext(parentElement.nativeNode)!;\n  const lView = context ? context.lView : null;\n  if (lView !== null) {\n    const parentTNode = lView[TVIEW].data[context.nodeIndex] as TNode;\n    _queryNodeChildren(\n        parentTNode, lView, predicate, matches, elementsOnly, parentElement.nativeNode);\n  } else {\n    // If the context is null, then `parentElement` was either created with Renderer2 or native DOM\n    // APIs.\n    _queryNativeNodeDescendants(parentElement.nativeNode, predicate, matches, elementsOnly);\n  }\n}\n\n/**\n * Recursively match the current TNode against the predicate, and goes on with the next ones.\n *\n * @param tNode the current TNode\n * @param lView the LView of this TNode\n * @param predicate the predicate to match\n * @param matches the list of positive matches\n * @param elementsOnly whether only elements should be searched\n * @param rootNativeNode the root native node on which predicate should not be matched\n */\nfunction _queryNodeChildren(\n    tNode: TNode, lView: LView, predicate: Predicate<DebugElement>|Predicate<DebugNode>,\n    matches: DebugElement[]|DebugNode[], elementsOnly: boolean, rootNativeNode: any) {\n  ngDevMode && assertTNodeForLView(tNode, lView);\n  const nativeNode = getNativeByTNodeOrNull(tNode, lView);\n  // For each type of TNode, specific logic is executed.\n  if (tNode.type & (TNodeType.AnyRNode | TNodeType.ElementContainer)) {\n    // Case 1: the TNode is an element\n    // The native node has to be checked.\n    _addQueryMatch(nativeNode, predicate, matches, elementsOnly, rootNativeNode);\n    if (isComponentHost(tNode)) {\n      // If the element is the host of a component, then all nodes in its view have to be processed.\n      // Note: the component's content (tNode.child) will be processed from the insertion points.\n      const componentView = getComponentLViewByIndex(tNode.index, lView);\n      if (componentView && componentView[TVIEW].firstChild) {\n        _queryNodeChildren(\n            componentView[TVIEW].firstChild!, componentView, predicate, matches, elementsOnly,\n            rootNativeNode);\n      }\n    } else {\n      if (tNode.child) {\n        // Otherwise, its children have to be processed.\n        _queryNodeChildren(tNode.child, lView, predicate, matches, elementsOnly, rootNativeNode);\n      }\n\n      // We also have to query the DOM directly in order to catch elements inserted through\n      // Renderer2. Note that this is __not__ optimal, because we're walking similar trees multiple\n      // times. ViewEngine could do it more efficiently, because all the insertions go through\n      // Renderer2, however that's not the case in Ivy. This approach is being used because:\n      // 1. Matching the ViewEngine behavior would mean potentially introducing a dependency\n      //    from `Renderer2` to Ivy which could bring Ivy code into ViewEngine.\n      // 2. It allows us to capture nodes that were inserted directly via the DOM.\n      nativeNode && _queryNativeNodeDescendants(nativeNode, predicate, matches, elementsOnly);\n    }\n    // In all cases, if a dynamic container exists for this node, each view inside it has to be\n    // processed.\n    const nodeOrContainer = lView[tNode.index];\n    if (isLContainer(nodeOrContainer)) {\n      _queryNodeChildrenInContainer(\n          nodeOrContainer, predicate, matches, elementsOnly, rootNativeNode);\n    }\n  } else if (tNode.type & TNodeType.Container) {\n    // Case 2: the TNode is a container\n    // The native node has to be checked.\n    const lContainer = lView[tNode.index];\n    _addQueryMatch(lContainer[NATIVE], predicate, matches, elementsOnly, rootNativeNode);\n    // Each view inside the container has to be processed.\n    _queryNodeChildrenInContainer(lContainer, predicate, matches, elementsOnly, rootNativeNode);\n  } else if (tNode.type & TNodeType.Projection) {\n    // Case 3: the TNode is a projection insertion point (i.e. a <ng-content>).\n    // The nodes projected at this location all need to be processed.\n    const componentView = lView![DECLARATION_COMPONENT_VIEW];\n    const componentHost = componentView[T_HOST] as TElementNode;\n    const head: TNode|null =\n        (componentHost.projection as (TNode | null)[])[tNode.projection as number];\n\n    if (Array.isArray(head)) {\n      for (let nativeNode of head) {\n        _addQueryMatch(nativeNode, predicate, matches, elementsOnly, rootNativeNode);\n      }\n    } else if (head) {\n      const nextLView = componentView[PARENT]! as LView;\n      const nextTNode = nextLView[TVIEW].data[head.index] as TNode;\n      _queryNodeChildren(nextTNode, nextLView, predicate, matches, elementsOnly, rootNativeNode);\n    }\n  } else if (tNode.child) {\n    // Case 4: the TNode is a view.\n    _queryNodeChildren(tNode.child, lView, predicate, matches, elementsOnly, rootNativeNode);\n  }\n\n  // We don't want to go to the next sibling of the root node.\n  if (rootNativeNode !== nativeNode) {\n    // To determine the next node to be processed, we need to use the next or the projectionNext\n    // link, depending on whether the current node has been projected.\n    const nextTNode = (tNode.flags & TNodeFlags.isProjected) ? tNode.projectionNext : tNode.next;\n    if (nextTNode) {\n      _queryNodeChildren(nextTNode, lView, predicate, matches, elementsOnly, rootNativeNode);\n    }\n  }\n}\n\n/**\n * Process all TNodes in a given container.\n *\n * @param lContainer the container to be processed\n * @param predicate the predicate to match\n * @param matches the list of positive matches\n * @param elementsOnly whether only elements should be searched\n * @param rootNativeNode the root native node on which predicate should not be matched\n */\nfunction _queryNodeChildrenInContainer(\n    lContainer: LContainer, predicate: Predicate<DebugElement>|Predicate<DebugNode>,\n    matches: DebugElement[]|DebugNode[], elementsOnly: boolean, rootNativeNode: any) {\n  for (let i = CONTAINER_HEADER_OFFSET; i < lContainer.length; i++) {\n    const childView = lContainer[i] as LView;\n    const firstChild = childView[TVIEW].firstChild;\n    if (firstChild) {\n      _queryNodeChildren(firstChild, childView, predicate, matches, elementsOnly, rootNativeNode);\n    }\n  }\n}\n\n/**\n * Match the current native node against the predicate.\n *\n * @param nativeNode the current native node\n * @param predicate the predicate to match\n * @param matches the list of positive matches\n * @param elementsOnly whether only elements should be searched\n * @param rootNativeNode the root native node on which predicate should not be matched\n */\nfunction _addQueryMatch(\n    nativeNode: any, predicate: Predicate<DebugElement>|Predicate<DebugNode>,\n    matches: DebugElement[]|DebugNode[], elementsOnly: boolean, rootNativeNode: any) {\n  if (rootNativeNode !== nativeNode) {\n    const debugNode = getDebugNode(nativeNode);\n    if (!debugNode) {\n      return;\n    }\n    // Type of the \"predicate and \"matches\" array are set based on the value of\n    // the \"elementsOnly\" parameter. TypeScript is not able to properly infer these\n    // types with generics, so we manually cast the parameters accordingly.\n    if (elementsOnly && (debugNode instanceof DebugElement) && predicate(debugNode) &&\n        matches.indexOf(debugNode) === -1) {\n      matches.push(debugNode);\n    } else if (\n        !elementsOnly && (predicate as Predicate<DebugNode>)(debugNode) &&\n        (matches as DebugNode[]).indexOf(debugNode) === -1) {\n      (matches as DebugNode[]).push(debugNode);\n    }\n  }\n}\n\n/**\n * Match all the descendants of a DOM node against a predicate.\n *\n * @param nativeNode the current native node\n * @param predicate the predicate to match\n * @param matches the list where matches are stored\n * @param elementsOnly whether only elements should be searched\n */\nfunction _queryNativeNodeDescendants(\n    parentNode: any, predicate: Predicate<DebugElement>|Predicate<DebugNode>,\n    matches: DebugElement[]|DebugNode[], elementsOnly: boolean) {\n  const nodes = parentNode.childNodes;\n  const length = nodes.length;\n\n  for (let i = 0; i < length; i++) {\n    const node = nodes[i];\n    const debugNode = getDebugNode(node);\n\n    if (debugNode) {\n      if (elementsOnly && (debugNode instanceof DebugElement) && predicate(debugNode) &&\n          matches.indexOf(debugNode) === -1) {\n        matches.push(debugNode);\n      } else if (\n          !elementsOnly && (predicate as Predicate<DebugNode>)(debugNode) &&\n          (matches as DebugNode[]).indexOf(debugNode) === -1) {\n        (matches as DebugNode[]).push(debugNode);\n      }\n\n      _queryNativeNodeDescendants(node, predicate, matches, elementsOnly);\n    }\n  }\n}\n\n/**\n * Iterates through the property bindings for a given node and generates\n * a map of property names to values. This map only contains property bindings\n * defined in templates, not in host bindings.\n */\nfunction collectPropertyBindings(\n    properties: {[key: string]: string}, tNode: TNode, lView: LView, tData: TData): void {\n  let bindingIndexes = tNode.propertyBindings;\n\n  if (bindingIndexes !== null) {\n    for (let i = 0; i < bindingIndexes.length; i++) {\n      const bindingIndex = bindingIndexes[i];\n      const propMetadata = tData[bindingIndex] as string;\n      const metadataParts = propMetadata.split(INTERPOLATION_DELIMITER);\n      const propertyName = metadataParts[0];\n      if (metadataParts.length > 1) {\n        let value = metadataParts[1];\n        for (let j = 1; j < metadataParts.length - 1; j++) {\n          value += renderStringify(lView[bindingIndex + j - 1]) + metadataParts[j + 1];\n        }\n        properties[propertyName] = value;\n      } else {\n        properties[propertyName] = lView[bindingIndex];\n      }\n    }\n  }\n}\n\n\n// Need to keep the nodes in a global Map so that multiple angular apps are supported.\nconst _nativeNodeToDebugNode = new Map<any, DebugNode>();\n\nconst NG_DEBUG_PROPERTY = '__ng_debug__';\n\n/**\n * @publicApi\n */\nexport function getDebugNode(nativeNode: any): DebugNode|null {\n  if (nativeNode instanceof Node) {\n    if (!(nativeNode.hasOwnProperty(NG_DEBUG_PROPERTY))) {\n      (nativeNode as any)[NG_DEBUG_PROPERTY] = nativeNode.nodeType == Node.ELEMENT_NODE ?\n          new DebugElement(nativeNode as Element) :\n          new DebugNode(nativeNode);\n    }\n    return (nativeNode as any)[NG_DEBUG_PROPERTY];\n  }\n  return null;\n}\n\n// TODO: cleanup all references to this function and remove it.\nexport function getDebugNodeR2(_nativeNode: any): DebugNode|null {\n  return null;\n}\n\nexport function getAllDebugNodes(): DebugNode[] {\n  return Array.from(_nativeNodeToDebugNode.values());\n}\n\nexport function indexDebugNode(node: DebugNode) {\n  _nativeNodeToDebugNode.set(node.nativeNode, node);\n}\n\nexport function removeDebugNodeFromIndex(node: DebugNode) {\n  _nativeNodeToDebugNode.delete(node.nativeNode);\n}\n\n/**\n * A boolean-valued function over a value, possibly including context information\n * regarding that value's position in an array.\n *\n * @publicApi\n */\nexport interface Predicate<T> {\n  (value: T): boolean;\n}\n"]}