/**
* @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 '../util/ng_dev_mode';
import { assertDefined, assertDomNode } from '../util/assert';
import { EMPTY_ARRAY } from '../util/empty';
import { assertLView } from './assert';
import { LContext } from './interfaces/context';
import { getLViewById, registerLView } from './interfaces/lview_tracking';
import { isLView } from './interfaces/type_checks';
import { CONTEXT, HEADER_OFFSET, HOST, ID, TVIEW } from './interfaces/view';
import { getComponentLViewByIndex, unwrapRNode } from './util/view_utils';
/**
* Returns the matching `LContext` data for a given DOM node, directive or component instance.
*
* This function will examine the provided DOM element, component, or directive instance\'s
* monkey-patched property to derive the `LContext` data. Once called then the monkey-patched
* value will be that of the newly created `LContext`.
*
* If the monkey-patched value is the `LView` instance then the context value for that
* target will be created and the monkey-patch reference will be updated. Therefore when this
* function is called it may mutate the provided element\'s, component\'s or any of the associated
* directive\'s monkey-patch values.
*
* If the monkey-patch value is not detected then the code will walk up the DOM until an element
* is found which contains a monkey-patch reference. When that occurs then the provided element
* will be updated with a new context (which is then returned). If the monkey-patch value is not
* detected for a component/directive instance then it will throw an error (all components and
* directives should be automatically monkey-patched by ivy).
*
* @param target Component, Directive or DOM Node.
*/
export function getLContext(target) {
let mpValue = readPatchedData(target);
if (mpValue) {
// only when it's an array is it considered an LView instance
// ... otherwise it's an already constructed LContext instance
if (isLView(mpValue)) {
const lView = mpValue;
let nodeIndex;
let component = undefined;
let directives = undefined;
if (isComponentInstance(target)) {
nodeIndex = findViaComponent(lView, target);
if (nodeIndex == -1) {
throw new Error('The provided component was not found in the application');
}
component = target;
}
else if (isDirectiveInstance(target)) {
nodeIndex = findViaDirective(lView, target);
if (nodeIndex == -1) {
throw new Error('The provided directive was not found in the application');
}
directives = getDirectivesAtNodeIndex(nodeIndex, lView);
}
else {
nodeIndex = findViaNativeElement(lView, target);
if (nodeIndex == -1) {
return null;
}
}
// the goal is not to fill the entire context full of data because the lookups
// are expensive. Instead, only the target data (the element, component, container, ICU
// expression or directive details) are filled into the context. If called multiple times
// with different target values then the missing target data will be filled in.
const native = unwrapRNode(lView[nodeIndex]);
const existingCtx = readPatchedData(native);
const context = (existingCtx && !Array.isArray(existingCtx)) ?
existingCtx :
createLContext(lView, nodeIndex, native);
// only when the component has been discovered then update the monkey-patch
if (component && context.component === undefined) {
context.component = component;
attachPatchData(context.component, context);
}
// only when the directives have been discovered then update the monkey-patch
if (directives && context.directives === undefined) {
context.directives = directives;
for (let i = 0; i < directives.length; i++) {
attachPatchData(directives[i], context);
}
}
attachPatchData(context.native, context);
mpValue = context;
}
}
else {
const rElement = target;
ngDevMode && assertDomNode(rElement);
// if the context is not found then we need to traverse upwards up the DOM
// to find the nearest element that has already been monkey patched with data
let parent = rElement;
while (parent = parent.parentNode) {
const parentContext = readPatchedData(parent);
if (parentContext) {
const lView = Array.isArray(parentContext) ? parentContext : parentContext.lView;
// the edge of the app was also reached here through another means
// (maybe because the DOM was changed manually).
if (!lView) {
return null;
}
const index = findViaNativeElement(lView, rElement);
if (index >= 0) {
const native = unwrapRNode(lView[index]);
const context = createLContext(lView, index, native);
attachPatchData(native, context);
mpValue = context;
break;
}
}
}
}
return mpValue || null;
}
/**
* Creates an empty instance of a `LContext` context
*/
function createLContext(lView, nodeIndex, native) {
return new LContext(lView[ID], nodeIndex, native);
}
/**
* Takes a component instance and returns the view for that component.
*
* @param componentInstance
* @returns The component's view
*/
export function getComponentViewByInstance(componentInstance) {
let patchedData = readPatchedData(componentInstance);
let lView;
if (isLView(patchedData)) {
const contextLView = patchedData;
const nodeIndex = findViaComponent(contextLView, componentInstance);
lView = getComponentLViewByIndex(nodeIndex, contextLView);
const context = createLContext(contextLView, nodeIndex, lView[HOST]);
context.component = componentInstance;
attachPatchData(componentInstance, context);
attachPatchData(context.native, context);
}
else {
const context = patchedData;
const contextLView = context.lView;
ngDevMode && assertLView(contextLView);
lView = getComponentLViewByIndex(context.nodeIndex, contextLView);
}
return lView;
}
/**
* This property will be monkey-patched on elements, components and directives.
*/
const MONKEY_PATCH_KEY_NAME = '__ngContext__';
/**
* Assigns the given data to the given target (which could be a component,
* directive or DOM node instance) using monkey-patching.
*/
export function attachPatchData(target, data) {
ngDevMode && assertDefined(target, 'Target expected');
// Only attach the ID of the view in order to avoid memory leaks (see #41047). We only do this
// for `LView`, because we have control over when an `LView` is created and destroyed, whereas
// we can't know when to remove an `LContext`.
if (isLView(data)) {
target[MONKEY_PATCH_KEY_NAME] = data[ID];
registerLView(data);
}
else {
target[MONKEY_PATCH_KEY_NAME] = data;
}
}
/**
* Returns the monkey-patch value data present on the target (which could be
* a component, directive or a DOM node).
*/
export function readPatchedData(target) {
ngDevMode && assertDefined(target, 'Target expected');
const data = target[MONKEY_PATCH_KEY_NAME];
return (typeof data === 'number') ? getLViewById(data) : data || null;
}
export function readPatchedLView(target) {
const value = readPatchedData(target);
if (value) {
return (isLView(value) ? value : value.lView);
}
return null;
}
export function isComponentInstance(instance) {
return instance && instance.constructor && instance.constructor.ɵcmp;
}
export function isDirectiveInstance(instance) {
return instance && instance.constructor && instance.constructor.ɵdir;
}
/**
* Locates the element within the given LView and returns the matching index
*/
function findViaNativeElement(lView, target) {
const tView = lView[TVIEW];
for (let i = HEADER_OFFSET; i < tView.bindingStartIndex; i++) {
if (unwrapRNode(lView[i]) === target) {
return i;
}
}
return -1;
}
/**
* Locates the next tNode (child, sibling or parent).
*/
function traverseNextElement(tNode) {
if (tNode.child) {
return tNode.child;
}
else if (tNode.next) {
return tNode.next;
}
else {
// Let's take the following template: text
// After checking the text node, we need to find the next parent that has a "next" TNode,
// in this case the parent `div`, so that we can find the component.
while (tNode.parent && !tNode.parent.next) {
tNode = tNode.parent;
}
return tNode.parent && tNode.parent.next;
}
}
/**
* Locates the component within the given LView and returns the matching index
*/
function findViaComponent(lView, componentInstance) {
const componentIndices = lView[TVIEW].components;
if (componentIndices) {
for (let i = 0; i < componentIndices.length; i++) {
const elementComponentIndex = componentIndices[i];
const componentView = getComponentLViewByIndex(elementComponentIndex, lView);
if (componentView[CONTEXT] === componentInstance) {
return elementComponentIndex;
}
}
}
else {
const rootComponentView = getComponentLViewByIndex(HEADER_OFFSET, lView);
const rootComponent = rootComponentView[CONTEXT];
if (rootComponent === componentInstance) {
// we are dealing with the root element here therefore we know that the
// element is the very first element after the HEADER data in the lView
return HEADER_OFFSET;
}
}
return -1;
}
/**
* Locates the directive within the given LView and returns the matching index
*/
function findViaDirective(lView, directiveInstance) {
// if a directive is monkey patched then it will (by default)
// have a reference to the LView of the current view. The
// element bound to the directive being search lives somewhere
// in the view data. We loop through the nodes and check their
// list of directives for the instance.
let tNode = lView[TVIEW].firstChild;
while (tNode) {
const directiveIndexStart = tNode.directiveStart;
const directiveIndexEnd = tNode.directiveEnd;
for (let i = directiveIndexStart; i < directiveIndexEnd; i++) {
if (lView[i] === directiveInstance) {
return tNode.index;
}
}
tNode = traverseNextElement(tNode);
}
return -1;
}
/**
* Returns a list of directives applied to a node at a specific index. The list includes
* directives matched by selector and any host directives, but it excludes components.
* Use `getComponentAtNodeIndex` to find the component applied to a node.
*
* @param nodeIndex The node index
* @param lView The target view data
*/
export function getDirectivesAtNodeIndex(nodeIndex, lView) {
const tNode = lView[TVIEW].data[nodeIndex];
if (tNode.directiveStart === 0)
return EMPTY_ARRAY;
const results = [];
for (let i = tNode.directiveStart; i < tNode.directiveEnd; i++) {
const directiveInstance = lView[i];
if (!isComponentInstance(directiveInstance)) {
results.push(directiveInstance);
}
}
return results;
}
export function getComponentAtNodeIndex(nodeIndex, lView) {
const tNode = lView[TVIEW].data[nodeIndex];
const { directiveStart, componentOffset } = tNode;
return componentOffset > -1 ? lView[directiveStart + componentOffset] : null;
}
/**
* Returns a map of local references (local reference name => element or directive instance) that
* exist on a given element.
*/
export function discoverLocalRefs(lView, nodeIndex) {
const tNode = lView[TVIEW].data[nodeIndex];
if (tNode && tNode.localNames) {
const result = {};
let localIndex = tNode.index + 1;
for (let i = 0; i < tNode.localNames.length; i += 2) {
result[tNode.localNames[i]] = lView[localIndex];
localIndex++;
}
return result;
}
return null;
}
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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 */\nimport '../util/ng_dev_mode';\n\nimport {assertDefined, assertDomNode} from '../util/assert';\nimport {EMPTY_ARRAY} from '../util/empty';\n\nimport {assertLView} from './assert';\nimport {LContext} from './interfaces/context';\nimport {getLViewById, registerLView} from './interfaces/lview_tracking';\nimport {TNode} from './interfaces/node';\nimport {RElement, RNode} from './interfaces/renderer_dom';\nimport {isLView} from './interfaces/type_checks';\nimport {CONTEXT, HEADER_OFFSET, HOST, ID, LView, TVIEW} from './interfaces/view';\nimport {getComponentLViewByIndex, unwrapRNode} from './util/view_utils';\n\n\n\n/**\n * Returns the matching `LContext` data for a given DOM node, directive or component instance.\n *\n * This function will examine the provided DOM element, component, or directive instance\\'s\n * monkey-patched property to derive the `LContext` data. Once called then the monkey-patched\n * value will be that of the newly created `LContext`.\n *\n * If the monkey-patched value is the `LView` instance then the context value for that\n * target will be created and the monkey-patch reference will be updated. Therefore when this\n * function is called it may mutate the provided element\\'s, component\\'s or any of the associated\n * directive\\'s monkey-patch values.\n *\n * If the monkey-patch value is not detected then the code will walk up the DOM until an element\n * is found which contains a monkey-patch reference. When that occurs then the provided element\n * will be updated with a new context (which is then returned). If the monkey-patch value is not\n * detected for a component/directive instance then it will throw an error (all components and\n * directives should be automatically monkey-patched by ivy).\n *\n * @param target Component, Directive or DOM Node.\n */\nexport function getLContext(target: any): LContext|null {\n  let mpValue = readPatchedData(target);\n  if (mpValue) {\n    // only when it's an array is it considered an LView instance\n    // ... otherwise it's an already constructed LContext instance\n    if (isLView(mpValue)) {\n      const lView: LView = mpValue!;\n      let nodeIndex: number;\n      let component: any = undefined;\n      let directives: any[]|null|undefined = undefined;\n\n      if (isComponentInstance(target)) {\n        nodeIndex = findViaComponent(lView, target);\n        if (nodeIndex == -1) {\n          throw new Error('The provided component was not found in the application');\n        }\n        component = target;\n      } else if (isDirectiveInstance(target)) {\n        nodeIndex = findViaDirective(lView, target);\n        if (nodeIndex == -1) {\n          throw new Error('The provided directive was not found in the application');\n        }\n        directives = getDirectivesAtNodeIndex(nodeIndex, lView);\n      } else {\n        nodeIndex = findViaNativeElement(lView, target as RElement);\n        if (nodeIndex == -1) {\n          return null;\n        }\n      }\n\n      // the goal is not to fill the entire context full of data because the lookups\n      // are expensive. Instead, only the target data (the element, component, container, ICU\n      // expression or directive details) are filled into the context. If called multiple times\n      // with different target values then the missing target data will be filled in.\n      const native = unwrapRNode(lView[nodeIndex]);\n      const existingCtx = readPatchedData(native);\n      const context: LContext = (existingCtx && !Array.isArray(existingCtx)) ?\n          existingCtx :\n          createLContext(lView, nodeIndex, native);\n\n      // only when the component has been discovered then update the monkey-patch\n      if (component && context.component === undefined) {\n        context.component = component;\n        attachPatchData(context.component, context);\n      }\n\n      // only when the directives have been discovered then update the monkey-patch\n      if (directives && context.directives === undefined) {\n        context.directives = directives;\n        for (let i = 0; i < directives.length; i++) {\n          attachPatchData(directives[i], context);\n        }\n      }\n\n      attachPatchData(context.native, context);\n      mpValue = context;\n    }\n  } else {\n    const rElement = target as RElement;\n    ngDevMode && assertDomNode(rElement);\n\n    // if the context is not found then we need to traverse upwards up the DOM\n    // to find the nearest element that has already been monkey patched with data\n    let parent = rElement as any;\n    while (parent = parent.parentNode) {\n      const parentContext = readPatchedData(parent);\n      if (parentContext) {\n        const lView = Array.isArray(parentContext) ? parentContext as LView : parentContext.lView;\n\n        // the edge of the app was also reached here through another means\n        // (maybe because the DOM was changed manually).\n        if (!lView) {\n          return null;\n        }\n\n        const index = findViaNativeElement(lView, rElement);\n        if (index >= 0) {\n          const native = unwrapRNode(lView[index]);\n          const context = createLContext(lView, index, native);\n          attachPatchData(native, context);\n          mpValue = context;\n          break;\n        }\n      }\n    }\n  }\n  return (mpValue as LContext) || null;\n}\n\n/**\n * Creates an empty instance of a `LContext` context\n */\nfunction createLContext(lView: LView, nodeIndex: number, native: RNode): LContext {\n  return new LContext(lView[ID], nodeIndex, native);\n}\n\n/**\n * Takes a component instance and returns the view for that component.\n *\n * @param componentInstance\n * @returns The component's view\n */\nexport function getComponentViewByInstance(componentInstance: {}): LView {\n  let patchedData = readPatchedData(componentInstance);\n  let lView: LView;\n\n  if (isLView(patchedData)) {\n    const contextLView: LView = patchedData;\n    const nodeIndex = findViaComponent(contextLView, componentInstance);\n    lView = getComponentLViewByIndex(nodeIndex, contextLView);\n    const context = createLContext(contextLView, nodeIndex, lView[HOST] as RElement);\n    context.component = componentInstance;\n    attachPatchData(componentInstance, context);\n    attachPatchData(context.native, context);\n  } else {\n    const context = patchedData as unknown as LContext;\n    const contextLView = context.lView!;\n    ngDevMode && assertLView(contextLView);\n    lView = getComponentLViewByIndex(context.nodeIndex, contextLView);\n  }\n  return lView;\n}\n\n/**\n * This property will be monkey-patched on elements, components and directives.\n */\nconst MONKEY_PATCH_KEY_NAME = '__ngContext__';\n\n/**\n * Assigns the given data to the given target (which could be a component,\n * directive or DOM node instance) using monkey-patching.\n */\nexport function attachPatchData(target: any, data: LView|LContext) {\n  ngDevMode && assertDefined(target, 'Target expected');\n  // Only attach the ID of the view in order to avoid memory leaks (see #41047). We only do this\n  // for `LView`, because we have control over when an `LView` is created and destroyed, whereas\n  // we can't know when to remove an `LContext`.\n  if (isLView(data)) {\n    target[MONKEY_PATCH_KEY_NAME] = data[ID];\n    registerLView(data);\n  } else {\n    target[MONKEY_PATCH_KEY_NAME] = data;\n  }\n}\n\n/**\n * Returns the monkey-patch value data present on the target (which could be\n * a component, directive or a DOM node).\n */\nexport function readPatchedData(target: any): LView|LContext|null {\n  ngDevMode && assertDefined(target, 'Target expected');\n  const data = target[MONKEY_PATCH_KEY_NAME];\n  return (typeof data === 'number') ? getLViewById(data) : data || null;\n}\n\nexport function readPatchedLView<T>(target: any): LView<T>|null {\n  const value = readPatchedData(target);\n  if (value) {\n    return (isLView(value) ? value : value.lView) as LView<T>;\n  }\n  return null;\n}\n\nexport function isComponentInstance(instance: any): boolean {\n  return instance && instance.constructor && instance.constructor.ɵcmp;\n}\n\nexport function isDirectiveInstance(instance: any): boolean {\n  return instance && instance.constructor && instance.constructor.ɵdir;\n}\n\n/**\n * Locates the element within the given LView and returns the matching index\n */\nfunction findViaNativeElement(lView: LView, target: RElement): number {\n  const tView = lView[TVIEW];\n  for (let i = HEADER_OFFSET; i < tView.bindingStartIndex; i++) {\n    if (unwrapRNode(lView[i]) === target) {\n      return i;\n    }\n  }\n\n  return -1;\n}\n\n/**\n * Locates the next tNode (child, sibling or parent).\n */\nfunction traverseNextElement(tNode: TNode): TNode|null {\n  if (tNode.child) {\n    return tNode.child;\n  } else if (tNode.next) {\n    return tNode.next;\n  } else {\n    // Let's take the following template: <div><span>text</span></div><component/>\n    // After checking the text node, we need to find the next parent that has a \"next\" TNode,\n    // in this case the parent `div`, so that we can find the component.\n    while (tNode.parent && !tNode.parent.next) {\n      tNode = tNode.parent;\n    }\n    return tNode.parent && tNode.parent.next;\n  }\n}\n\n/**\n * Locates the component within the given LView and returns the matching index\n */\nfunction findViaComponent(lView: LView, componentInstance: {}): number {\n  const componentIndices = lView[TVIEW].components;\n  if (componentIndices) {\n    for (let i = 0; i < componentIndices.length; i++) {\n      const elementComponentIndex = componentIndices[i];\n      const componentView = getComponentLViewByIndex(elementComponentIndex, lView);\n      if (componentView[CONTEXT] === componentInstance) {\n        return elementComponentIndex;\n      }\n    }\n  } else {\n    const rootComponentView = getComponentLViewByIndex(HEADER_OFFSET, lView);\n    const rootComponent = rootComponentView[CONTEXT];\n    if (rootComponent === componentInstance) {\n      // we are dealing with the root element here therefore we know that the\n      // element is the very first element after the HEADER data in the lView\n      return HEADER_OFFSET;\n    }\n  }\n  return -1;\n}\n\n/**\n * Locates the directive within the given LView and returns the matching index\n */\nfunction findViaDirective(lView: LView, directiveInstance: {}): number {\n  // if a directive is monkey patched then it will (by default)\n  // have a reference to the LView of the current view. The\n  // element bound to the directive being search lives somewhere\n  // in the view data. We loop through the nodes and check their\n  // list of directives for the instance.\n  let tNode = lView[TVIEW].firstChild;\n  while (tNode) {\n    const directiveIndexStart = tNode.directiveStart;\n    const directiveIndexEnd = tNode.directiveEnd;\n    for (let i = directiveIndexStart; i < directiveIndexEnd; i++) {\n      if (lView[i] === directiveInstance) {\n        return tNode.index;\n      }\n    }\n    tNode = traverseNextElement(tNode);\n  }\n  return -1;\n}\n\n/**\n * Returns a list of directives applied to a node at a specific index. The list includes\n * directives matched by selector and any host directives, but it excludes components.\n * Use `getComponentAtNodeIndex` to find the component applied to a node.\n *\n * @param nodeIndex The node index\n * @param lView The target view data\n */\nexport function getDirectivesAtNodeIndex(nodeIndex: number, lView: LView): any[]|null {\n  const tNode = lView[TVIEW].data[nodeIndex] as TNode;\n  if (tNode.directiveStart === 0) return EMPTY_ARRAY;\n  const results: any[] = [];\n  for (let i = tNode.directiveStart; i < tNode.directiveEnd; i++) {\n    const directiveInstance = lView[i];\n    if (!isComponentInstance(directiveInstance)) {\n      results.push(directiveInstance);\n    }\n  }\n  return results;\n}\n\nexport function getComponentAtNodeIndex(nodeIndex: number, lView: LView): {}|null {\n  const tNode = lView[TVIEW].data[nodeIndex] as TNode;\n  const {directiveStart, componentOffset} = tNode;\n  return componentOffset > -1 ? lView[directiveStart + componentOffset] : null;\n}\n\n/**\n * Returns a map of local references (local reference name => element or directive instance) that\n * exist on a given element.\n */\nexport function discoverLocalRefs(lView: LView, nodeIndex: number): {[key: string]: any}|null {\n  const tNode = lView[TVIEW].data[nodeIndex] as TNode;\n  if (tNode && tNode.localNames) {\n    const result: {[key: string]: any} = {};\n    let localIndex = tNode.index + 1;\n    for (let i = 0; i < tNode.localNames.length; i += 2) {\n      result[tNode.localNames[i]] = lView[localIndex];\n      localIndex++;\n    }\n    return result;\n  }\n\n  return null;\n}\n"]}