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/** * @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 { retrieveHydrationInfo } from '../../hydration/utils'; import { assertEqual } from '../../util/assert'; import { CONTEXT, FLAGS, HOST, HYDRATION, INJECTOR, TVIEW } from '../interfaces/view'; import { enterView, leaveView } from '../state'; import { getComponentLViewByIndex, isCreationMode } from '../util/view_utils'; import { executeTemplate, executeViewQueryFn, refreshContentQueries } from './shared'; export function renderComponent(hostLView, componentHostIdx) { ngDevMode && assertEqual(isCreationMode(hostLView), true, 'Should be run in creation mode'); const componentView = getComponentLViewByIndex(componentHostIdx, hostLView); const componentTView = componentView[TVIEW]; syncViewWithBlueprint(componentTView, componentView); const hostRNode = componentView[HOST]; // Populate an LView with hydration info retrieved from the DOM via TransferState. if (hostRNode !== null && componentView[HYDRATION] === null) { componentView[HYDRATION] = retrieveHydrationInfo(hostRNode, componentView[INJECTOR]); } renderView(componentTView, componentView, componentView[CONTEXT]); } /** * Syncs an LView instance with its blueprint if they have gotten out of sync. * * Typically, blueprints and their view instances should always be in sync, so the loop here * will be skipped. However, consider this case of two components side-by-side: * * App template: * ``` * <comp></comp> * <comp></comp> * ``` * * The following will happen: * 1. App template begins processing. * 2. First <comp> is matched as a component and its LView is created. * 3. Second <comp> is matched as a component and its LView is created. * 4. App template completes processing, so it's time to check child templates. * 5. First <comp> template is checked. It has a directive, so its def is pushed to blueprint. * 6. Second <comp> template is checked. Its blueprint has been updated by the first * <comp> template, but its LView was created before this update, so it is out of sync. * * Note that embedded views inside ngFor loops will never be out of sync because these views * are processed as soon as they are created. * * @param tView The `TView` that contains the blueprint for syncing * @param lView The view to sync */ export function syncViewWithBlueprint(tView, lView) { for (let i = lView.length; i < tView.blueprint.length; i++) { lView.push(tView.blueprint[i]); } } /** * Processes a view in the creation mode. This includes a number of steps in a specific order: * - creating view query functions (if any); * - executing a template function in the creation mode; * - updating static queries (if any); * - creating child components defined in a given view. */ export function renderView(tView, lView, context) { ngDevMode && assertEqual(isCreationMode(lView), true, 'Should be run in creation mode'); enterView(lView); try { const viewQuery = tView.viewQuery; if (viewQuery !== null) { executeViewQueryFn(1 /* RenderFlags.Create */, viewQuery, context); } // Execute a template associated with this view, if it exists. A template function might not be // defined for the root component views. const templateFn = tView.template; if (templateFn !== null) { executeTemplate(tView, lView, templateFn, 1 /* RenderFlags.Create */, context); } // This needs to be set before children are processed to support recursive components. // This must be set to false immediately after the first creation run because in an // ngFor loop, all the views will be created together before update mode runs and turns // off firstCreatePass. If we don't set it here, instances will perform directive // matching, etc again and again. if (tView.firstCreatePass) { tView.firstCreatePass = false; } // We resolve content queries specifically marked as `static` in creation mode. Dynamic // content queries are resolved during change detection (i.e. update mode), after embedded // views are refreshed (see block above). if (tView.staticContentQueries) { refreshContentQueries(tView, lView); } // We must materialize query results before child components are processed // in case a child component has projected a container. The LContainer needs // to exist so the embedded views are properly attached by the container. if (tView.staticViewQueries) { executeViewQueryFn(2 /* RenderFlags.Update */, tView.viewQuery, context); } // Render child component views. const components = tView.components; if (components !== null) { renderChildComponents(lView, components); } } catch (error) { // If we didn't manage to get past the first template pass due to // an error, mark the view as corrupted so we can try to recover. if (tView.firstCreatePass) { tView.incompleteFirstPass = true; tView.firstCreatePass = false; } throw error; } finally { lView[FLAGS] &= ~4 /* LViewFlags.CreationMode */; leaveView(); } } /** Renders child components in the current view (creation mode). */ function renderChildComponents(hostLView, components) { for (let i = 0; i < components.length; i++) { renderComponent(hostLView, components[i]); } } //# 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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 {retrieveHydrationInfo} from '../../hydration/utils';\nimport {assertEqual} from '../../util/assert';\nimport {RenderFlags} from '../interfaces/definition';\nimport {CONTEXT, FLAGS, HOST, HYDRATION, INJECTOR, LView, LViewFlags, TVIEW, TView} from '../interfaces/view';\nimport {enterView, leaveView} from '../state';\nimport {getComponentLViewByIndex, isCreationMode} from '../util/view_utils';\n\nimport {executeTemplate, executeViewQueryFn, refreshContentQueries} from './shared';\n\nexport function renderComponent(hostLView: LView, componentHostIdx: number) {\n  ngDevMode && assertEqual(isCreationMode(hostLView), true, 'Should be run in creation mode');\n  const componentView = getComponentLViewByIndex(componentHostIdx, hostLView);\n  const componentTView = componentView[TVIEW];\n  syncViewWithBlueprint(componentTView, componentView);\n\n  const hostRNode = componentView[HOST];\n  // Populate an LView with hydration info retrieved from the DOM via TransferState.\n  if (hostRNode !== null && componentView[HYDRATION] === null) {\n    componentView[HYDRATION] = retrieveHydrationInfo(hostRNode, componentView[INJECTOR]!);\n  }\n\n  renderView(componentTView, componentView, componentView[CONTEXT]);\n}\n\n/**\n * Syncs an LView instance with its blueprint if they have gotten out of sync.\n *\n * Typically, blueprints and their view instances should always be in sync, so the loop here\n * will be skipped. However, consider this case of two components side-by-side:\n *\n * App template:\n * ```\n * <comp></comp>\n * <comp></comp>\n * ```\n *\n * The following will happen:\n * 1. App template begins processing.\n * 2. First <comp> is matched as a component and its LView is created.\n * 3. Second <comp> is matched as a component and its LView is created.\n * 4. App template completes processing, so it's time to check child templates.\n * 5. First <comp> template is checked. It has a directive, so its def is pushed to blueprint.\n * 6. Second <comp> template is checked. Its blueprint has been updated by the first\n * <comp> template, but its LView was created before this update, so it is out of sync.\n *\n * Note that embedded views inside ngFor loops will never be out of sync because these views\n * are processed as soon as they are created.\n *\n * @param tView The `TView` that contains the blueprint for syncing\n * @param lView The view to sync\n */\nexport function syncViewWithBlueprint(tView: TView, lView: LView) {\n  for (let i = lView.length; i < tView.blueprint.length; i++) {\n    lView.push(tView.blueprint[i]);\n  }\n}\n\n/**\n * Processes a view in the creation mode. This includes a number of steps in a specific order:\n * - creating view query functions (if any);\n * - executing a template function in the creation mode;\n * - updating static queries (if any);\n * - creating child components defined in a given view.\n */\nexport function renderView<T>(tView: TView, lView: LView<T>, context: T): void {\n  ngDevMode && assertEqual(isCreationMode(lView), true, 'Should be run in creation mode');\n  enterView(lView);\n  try {\n    const viewQuery = tView.viewQuery;\n    if (viewQuery !== null) {\n      executeViewQueryFn<T>(RenderFlags.Create, viewQuery, context);\n    }\n\n    // Execute a template associated with this view, if it exists. A template function might not be\n    // defined for the root component views.\n    const templateFn = tView.template;\n    if (templateFn !== null) {\n      executeTemplate<T>(tView, lView, templateFn, RenderFlags.Create, context);\n    }\n\n    // This needs to be set before children are processed to support recursive components.\n    // This must be set to false immediately after the first creation run because in an\n    // ngFor loop, all the views will be created together before update mode runs and turns\n    // off firstCreatePass. If we don't set it here, instances will perform directive\n    // matching, etc again and again.\n    if (tView.firstCreatePass) {\n      tView.firstCreatePass = false;\n    }\n\n    // We resolve content queries specifically marked as `static` in creation mode. Dynamic\n    // content queries are resolved during change detection (i.e. update mode), after embedded\n    // views are refreshed (see block above).\n    if (tView.staticContentQueries) {\n      refreshContentQueries(tView, lView);\n    }\n\n    // We must materialize query results before child components are processed\n    // in case a child component has projected a container. The LContainer needs\n    // to exist so the embedded views are properly attached by the container.\n    if (tView.staticViewQueries) {\n      executeViewQueryFn<T>(RenderFlags.Update, tView.viewQuery!, context);\n    }\n\n    // Render child component views.\n    const components = tView.components;\n    if (components !== null) {\n      renderChildComponents(lView, components);\n    }\n\n  } catch (error) {\n    // If we didn't manage to get past the first template pass due to\n    // an error, mark the view as corrupted so we can try to recover.\n    if (tView.firstCreatePass) {\n      tView.incompleteFirstPass = true;\n      tView.firstCreatePass = false;\n    }\n\n    throw error;\n  } finally {\n    lView[FLAGS] &= ~LViewFlags.CreationMode;\n    leaveView();\n  }\n}\n\n/** Renders child components in the current view (creation mode). */\nfunction renderChildComponents(hostLView: LView, components: number[]): void {\n  for (let i = 0; i < components.length; i++) {\n    renderComponent(hostLView, components[i]);\n  }\n}\n"]}