@angular/core
Version:
Angular - the core framework
292 lines • 37.3 kB
JavaScript
/**
* @license
* Copyright Google Inc. 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 { assertDomNode } from '../util/assert';
import { EMPTY_ARRAY } from './empty';
import { MONKEY_PATCH_KEY_NAME } from './interfaces/context';
import { CONTEXT, HEADER_OFFSET, HOST, TVIEW } from './interfaces/view';
import { getComponentViewByIndex, getNativeByTNode, readPatchedData, 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) {
var 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 (Array.isArray(mpValue)) {
var lView = mpValue;
var nodeIndex = void 0;
var component = undefined;
var 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, false);
}
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.
var native = unwrapRNode(lView[nodeIndex]);
var existingCtx = readPatchedData(native);
var 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 (var i = 0; i < directives.length; i++) {
attachPatchData(directives[i], context);
}
}
attachPatchData(context.native, context);
mpValue = context;
}
}
else {
var 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
var parent_1 = rElement;
while (parent_1 = parent_1.parentNode) {
var parentContext = readPatchedData(parent_1);
if (parentContext) {
var lView = void 0;
if (Array.isArray(parentContext)) {
lView = parentContext;
}
else {
lView = 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;
}
var index = findViaNativeElement(lView, rElement);
if (index >= 0) {
var native = unwrapRNode(lView[index]);
var 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 {
lView: lView,
nodeIndex: nodeIndex,
native: native,
component: undefined,
directives: undefined,
localRefs: undefined,
};
}
/**
* Takes a component instance and returns the view for that component.
*
* @param componentInstance
* @returns The component's view
*/
export function getComponentViewByInstance(componentInstance) {
var lView = readPatchedData(componentInstance);
var view;
if (Array.isArray(lView)) {
var nodeIndex = findViaComponent(lView, componentInstance);
view = getComponentViewByIndex(nodeIndex, lView);
var context = createLContext(lView, nodeIndex, view[HOST]);
context.component = componentInstance;
attachPatchData(componentInstance, context);
attachPatchData(context.native, context);
}
else {
var context = lView;
view = getComponentViewByIndex(context.nodeIndex, context.lView);
}
return view;
}
/**
* 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) {
target[MONKEY_PATCH_KEY_NAME] = data;
}
export function isComponentInstance(instance) {
return instance && instance.constructor && instance.constructor.ngComponentDef;
}
export function isDirectiveInstance(instance) {
return instance && instance.constructor && instance.constructor.ngDirectiveDef;
}
/**
* Locates the element within the given LView and returns the matching index
*/
function findViaNativeElement(lView, target) {
var tNode = lView[TVIEW].firstChild;
while (tNode) {
var native = getNativeByTNode(tNode, lView);
if (native === target) {
return tNode.index;
}
tNode = traverseNextElement(tNode);
}
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: <div><span>text</span></div><component/>
// 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) {
var componentIndices = lView[TVIEW].components;
if (componentIndices) {
for (var i = 0; i < componentIndices.length; i++) {
var elementComponentIndex = componentIndices[i];
var componentView = getComponentViewByIndex(elementComponentIndex, lView);
if (componentView[CONTEXT] === componentInstance) {
return elementComponentIndex;
}
}
}
else {
var rootComponentView = getComponentViewByIndex(HEADER_OFFSET, lView);
var 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.
var tNode = lView[TVIEW].firstChild;
while (tNode) {
var directiveIndexStart = tNode.directiveStart;
var directiveIndexEnd = tNode.directiveEnd;
for (var i = directiveIndexStart; i < directiveIndexEnd; i++) {
if (lView[i] === directiveInstance) {
return tNode.index;
}
}
tNode = traverseNextElement(tNode);
}
return -1;
}
/**
* Returns a list of directives extracted from the given view based on the
* provided list of directive index values.
*
* @param nodeIndex The node index
* @param lView The target view data
* @param includeComponents Whether or not to include components in returned directives
*/
export function getDirectivesAtNodeIndex(nodeIndex, lView, includeComponents) {
var tNode = lView[TVIEW].data[nodeIndex];
var directiveStartIndex = tNode.directiveStart;
if (directiveStartIndex == 0)
return EMPTY_ARRAY;
var directiveEndIndex = tNode.directiveEnd;
if (!includeComponents && tNode.flags & 1 /* isComponent */)
directiveStartIndex++;
return lView.slice(directiveStartIndex, directiveEndIndex);
}
export function getComponentAtNodeIndex(nodeIndex, lView) {
var tNode = lView[TVIEW].data[nodeIndex];
var directiveStartIndex = tNode.directiveStart;
return tNode.flags & 1 /* isComponent */ ? lView[directiveStartIndex] : 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) {
var tNode = lView[TVIEW].data[nodeIndex];
if (tNode && tNode.localNames) {
var result = {};
var localIndex = tNode.index + 1;
for (var 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 Inc. 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 {assertDomNode} from '../util/assert';\n\nimport {EMPTY_ARRAY} from './empty';\nimport {LContext, MONKEY_PATCH_KEY_NAME} from './interfaces/context';\nimport {TNode, TNodeFlags} from './interfaces/node';\nimport {RElement, RNode} from './interfaces/renderer';\nimport {CONTEXT, HEADER_OFFSET, HOST, LView, TVIEW} from './interfaces/view';\nimport {getComponentViewByIndex, getNativeByTNode, readPatchedData, unwrapRNode} from './util/view_utils';\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 (Array.isArray(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, false);\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. 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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        let lView: LView|null;\n        if (Array.isArray(parentContext)) {\n          lView = parentContext as LView;\n        } else {\n          lView = parentContext.lView;\n        }\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 {\n    lView,\n    nodeIndex,\n    native,\n    component: undefined,\n    directives: undefined,\n    localRefs: undefined,\n  };\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 lView = readPatchedData(componentInstance);\n  let view: LView;\n\n  if (Array.isArray(lView)) {\n    const nodeIndex = findViaComponent(lView, componentInstance);\n    view = getComponentViewByIndex(nodeIndex, lView);\n    const context = createLContext(lView, nodeIndex, view[HOST] as RElement);\n    context.component = componentInstance;\n    attachPatchData(componentInstance, context);\n    attachPatchData(context.native, context);\n  } else {\n    const context = lView as any as LContext;\n    view = getComponentViewByIndex(context.nodeIndex, context.lView);\n  }\n  return view;\n}\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  target[MONKEY_PATCH_KEY_NAME] = data;\n}\n\nexport function isComponentInstance(instance: any): boolean {\n  return instance && instance.constructor && instance.constructor.ngComponentDef;\n}\n\nexport function isDirectiveInstance(instance: any): boolean {\n  return instance && instance.constructor && instance.constructor.ngDirectiveDef;\n}\n\n/**\n * Locates the element within the given LView and returns the matching index\n */\nfunction 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*/\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 extracted from the given view based on the\n * provided list of directive index values.\n *\n * @param nodeIndex The node index\n * @param lView The target view data\n * @param includeComponents Whether or not to include components in returned directives\n */\nexport function getDirectivesAtNodeIndex(\n    nodeIndex: number, lView: LView, includeComponents: boolean): any[]|null {\n  const tNode = lView[TVIEW].data[nodeIndex] as TNode;\n  let directiveStartIndex = tNode.directiveStart;\n  if (directiveStartIndex == 0) return EMPTY_ARRAY;\n  const directiveEndIndex = tNode.directiveEnd;\n  if (!includeComponents && tNode.flags & TNodeFlags.isComponent) directiveStartIndex++;\n  return lView.slice(directiveStartIndex, directiveEndIndex);\n}\n\nexport function getComponentAtNodeIndex(nodeIndex: number, lView: LView): {}|null {\n  const tNode = lView[TVIEW].data[nodeIndex] as TNode;\n  let directiveStartIndex = tNode.directiveStart;\n  return tNode.flags & TNodeFlags.isComponent ? lView[directiveStartIndex] : 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"]}