@angular/core
Version:
Angular - the core framework
299 lines • 42.1 kB
JavaScript
/**
* @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 { DECLARATION_COMPONENT_VIEW, HEADER_OFFSET, HOST } from '../render3/interfaces/view';
import { getFirstNativeNode } from '../render3/node_manipulation';
import { ɵɵresolveBody } from '../render3/util/misc_utils';
import { renderStringify } from '../render3/util/stringify_utils';
import { getNativeByTNode, unwrapRNode } from '../render3/util/view_utils';
import { assertDefined } from '../util/assert';
import { compressNodeLocation, decompressNodeLocation } from './compression';
import { nodeNotFoundAtPathError, nodeNotFoundError, validateSiblingNodeExists } from './error_handling';
import { NodeNavigationStep, NODES, REFERENCE_NODE_BODY, REFERENCE_NODE_HOST } from './interfaces';
import { calcSerializedContainerSize, getSegmentHead } from './utils';
/** Whether current TNode is a first node in an <ng-container>. */
function isFirstElementInNgContainer(tNode) {
return !tNode.prev && tNode.parent?.type === 8 /* TNodeType.ElementContainer */;
}
/** Returns an instruction index (subtracting HEADER_OFFSET). */
function getNoOffsetIndex(tNode) {
return tNode.index - HEADER_OFFSET;
}
/**
* Check whether a given node exists, but is disconnected from the DOM.
*
* Note: we leverage the fact that we have this information available in the DOM emulation
* layer (in Domino) for now. Longer-term solution should not rely on the DOM emulation and
* only use internal data structures and state to compute this information.
*/
export function isDisconnectedNode(tNode, lView) {
return !(tNode.type & 16 /* TNodeType.Projection */) && !!lView[tNode.index] &&
!unwrapRNode(lView[tNode.index])?.isConnected;
}
/**
* Locate a node in DOM tree that corresponds to a given TNode.
*
* @param hydrationInfo The hydration annotation data
* @param tView the current tView
* @param lView the current lView
* @param tNode the current tNode
* @returns an RNode that represents a given tNode
*/
export function locateNextRNode(hydrationInfo, tView, lView, tNode) {
let native = null;
const noOffsetIndex = getNoOffsetIndex(tNode);
const nodes = hydrationInfo.data[NODES];
if (nodes?.[noOffsetIndex]) {
// We know the exact location of the node.
native = locateRNodeByPath(nodes[noOffsetIndex], lView);
}
else if (tView.firstChild === tNode) {
// We create a first node in this view, so we use a reference
// to the first child in this DOM segment.
native = hydrationInfo.firstChild;
}
else {
// Locate a node based on a previous sibling or a parent node.
const previousTNodeParent = tNode.prev === null;
const previousTNode = (tNode.prev ?? tNode.parent);
ngDevMode &&
assertDefined(previousTNode, 'Unexpected state: current TNode does not have a connection ' +
'to the previous node or a parent node.');
if (isFirstElementInNgContainer(tNode)) {
const noOffsetParentIndex = getNoOffsetIndex(tNode.parent);
native = getSegmentHead(hydrationInfo, noOffsetParentIndex);
}
else {
let previousRElement = getNativeByTNode(previousTNode, lView);
if (previousTNodeParent) {
native = previousRElement.firstChild;
}
else {
// If the previous node is an element, but it also has container info,
// this means that we are processing a node like `<div #vcrTarget>`, which is
// represented in the DOM as `<div></div>...<!--container-->`.
// In this case, there are nodes *after* this element and we need to skip
// all of them to reach an element that we are looking for.
const noOffsetPrevSiblingIndex = getNoOffsetIndex(previousTNode);
const segmentHead = getSegmentHead(hydrationInfo, noOffsetPrevSiblingIndex);
if (previousTNode.type === 2 /* TNodeType.Element */ && segmentHead) {
const numRootNodesToSkip = calcSerializedContainerSize(hydrationInfo, noOffsetPrevSiblingIndex);
// `+1` stands for an anchor comment node after all the views in this container.
const nodesToSkip = numRootNodesToSkip + 1;
// First node after this segment.
native = siblingAfter(nodesToSkip, segmentHead);
}
else {
native = previousRElement.nextSibling;
}
}
}
}
return native;
}
/**
* Skips over a specified number of nodes and returns the next sibling node after that.
*/
export function siblingAfter(skip, from) {
let currentNode = from;
for (let i = 0; i < skip; i++) {
ngDevMode && validateSiblingNodeExists(currentNode);
currentNode = currentNode.nextSibling;
}
return currentNode;
}
/**
* Helper function to produce a string representation of the navigation steps
* (in terms of `nextSibling` and `firstChild` navigations). Used in error
* messages in dev mode.
*/
function stringifyNavigationInstructions(instructions) {
const container = [];
for (let i = 0; i < instructions.length; i += 2) {
const step = instructions[i];
const repeat = instructions[i + 1];
for (let r = 0; r < repeat; r++) {
container.push(step === NodeNavigationStep.FirstChild ? 'firstChild' : 'nextSibling');
}
}
return container.join('.');
}
/**
* Helper function that navigates from a starting point node (the `from` node)
* using provided set of navigation instructions (within `path` argument).
*/
function navigateToNode(from, instructions) {
let node = from;
for (let i = 0; i < instructions.length; i += 2) {
const step = instructions[i];
const repeat = instructions[i + 1];
for (let r = 0; r < repeat; r++) {
if (ngDevMode && !node) {
throw nodeNotFoundAtPathError(from, stringifyNavigationInstructions(instructions));
}
switch (step) {
case NodeNavigationStep.FirstChild:
node = node.firstChild;
break;
case NodeNavigationStep.NextSibling:
node = node.nextSibling;
break;
}
}
}
if (ngDevMode && !node) {
throw nodeNotFoundAtPathError(from, stringifyNavigationInstructions(instructions));
}
return node;
}
/**
* Locates an RNode given a set of navigation instructions (which also contains
* a starting point node info).
*/
function locateRNodeByPath(path, lView) {
const [referenceNode, ...navigationInstructions] = decompressNodeLocation(path);
let ref;
if (referenceNode === REFERENCE_NODE_HOST) {
ref = lView[DECLARATION_COMPONENT_VIEW][HOST];
}
else if (referenceNode === REFERENCE_NODE_BODY) {
ref = ɵɵresolveBody(lView[DECLARATION_COMPONENT_VIEW][HOST]);
}
else {
const parentElementId = Number(referenceNode);
ref = unwrapRNode(lView[parentElementId + HEADER_OFFSET]);
}
return navigateToNode(ref, navigationInstructions);
}
/**
* Generate a list of DOM navigation operations to get from node `start` to node `finish`.
*
* Note: assumes that node `start` occurs before node `finish` in an in-order traversal of the DOM
* tree. That is, we should be able to get from `start` to `finish` purely by using `.firstChild`
* and `.nextSibling` operations.
*/
export function navigateBetween(start, finish) {
if (start === finish) {
return [];
}
else if (start.parentElement == null || finish.parentElement == null) {
return null;
}
else if (start.parentElement === finish.parentElement) {
return navigateBetweenSiblings(start, finish);
}
else {
// `finish` is a child of its parent, so the parent will always have a child.
const parent = finish.parentElement;
const parentPath = navigateBetween(start, parent);
const childPath = navigateBetween(parent.firstChild, finish);
if (!parentPath || !childPath)
return null;
return [
// First navigate to `finish`'s parent
...parentPath,
// Then to its first child.
NodeNavigationStep.FirstChild,
// And finally from that node to `finish` (maybe a no-op if we're already there).
...childPath,
];
}
}
/**
* Calculates a path between 2 sibling nodes (generates a number of `NextSibling` navigations).
* Returns `null` if no such path exists between the given nodes.
*/
function navigateBetweenSiblings(start, finish) {
const nav = [];
let node = null;
for (node = start; node != null && node !== finish; node = node.nextSibling) {
nav.push(NodeNavigationStep.NextSibling);
}
// If the `node` becomes `null` or `undefined` at the end, that means that we
// didn't find the `end` node, thus return `null` (which would trigger serialization
// error to be produced).
return node == null ? null : nav;
}
/**
* Calculates a path between 2 nodes in terms of `nextSibling` and `firstChild`
* navigations:
* - the `from` node is a known node, used as an starting point for the lookup
* (the `fromNodeName` argument is a string representation of the node).
* - the `to` node is a node that the runtime logic would be looking up,
* using the path generated by this function.
*/
export function calcPathBetween(from, to, fromNodeName) {
const path = navigateBetween(from, to);
return path === null ? null : compressNodeLocation(fromNodeName, path);
}
/**
* Invoked at serialization time (on the server) when a set of navigation
* instructions needs to be generated for a TNode.
*/
export function calcPathForNode(tNode, lView) {
let parentTNode = tNode.parent;
let parentIndex;
let parentRNode;
let referenceNodeName;
// Skip over all parent nodes that are disconnected from the DOM, such nodes
// can not be used as anchors.
//
// This might happen in certain content projection-based use-cases, where
// a content of an element is projected and used, when a parent element
// itself remains detached from DOM. In this scenario we try to find a parent
// element that is attached to DOM and can act as an anchor instead.
while (parentTNode !== null && isDisconnectedNode(parentTNode, lView)) {
parentTNode = parentTNode.parent;
}
if (parentTNode === null || !(parentTNode.type & 3 /* TNodeType.AnyRNode */)) {
// If there is no parent TNode or a parent TNode does not represent an RNode
// (i.e. not a DOM node), use component host element as a reference node.
parentIndex = referenceNodeName = REFERENCE_NODE_HOST;
parentRNode = lView[DECLARATION_COMPONENT_VIEW][HOST];
}
else {
// Use parent TNode as a reference node.
parentIndex = parentTNode.index;
parentRNode = unwrapRNode(lView[parentIndex]);
referenceNodeName = renderStringify(parentIndex - HEADER_OFFSET);
}
let rNode = unwrapRNode(lView[tNode.index]);
if (tNode.type & 12 /* TNodeType.AnyContainer */) {
// For <ng-container> nodes, instead of serializing a reference
// to the anchor comment node, serialize a location of the first
// DOM element. Paired with the container size (serialized as a part
// of `ngh.containers`), it should give enough information for runtime
// to hydrate nodes in this container.
const firstRNode = getFirstNativeNode(lView, tNode);
// If container is not empty, use a reference to the first element,
// otherwise, rNode would point to an anchor comment node.
if (firstRNode) {
rNode = firstRNode;
}
}
let path = calcPathBetween(parentRNode, rNode, referenceNodeName);
if (path === null && parentRNode !== rNode) {
// Searching for a path between elements within a host node failed.
// Trying to find a path to an element starting from the `document.body` instead.
//
// Important note: this type of reference is relatively unstable, since Angular
// may not be able to control parts of the page that the runtime logic navigates
// through. This is mostly needed to cover "portals" use-case (like menus, dialog boxes,
// etc), where nodes are content-projected (including direct DOM manipulations) outside
// of the host node. The better solution is to provide APIs to work with "portals",
// at which point this code path would not be needed.
const body = parentRNode.ownerDocument.body;
path = calcPathBetween(body, rNode, REFERENCE_NODE_BODY);
if (path === null) {
// If the path is still empty, it's likely that this node is detached and
// won't be found during hydration.
throw nodeNotFoundError(lView, tNode);
}
}
return path;
}
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REFERENCE_NODE_BODY, REFERENCE_NODE_HOST} from './interfaces';\nimport {calcSerializedContainerSize, getSegmentHead} from './utils';\n\n\n/** Whether current TNode is a first node in an <ng-container>. */\nfunction isFirstElementInNgContainer(tNode: TNode): boolean {\n  return !tNode.prev && tNode.parent?.type === TNodeType.ElementContainer;\n}\n\n/** Returns an instruction index (subtracting HEADER_OFFSET). */\nfunction getNoOffsetIndex(tNode: TNode): number {\n  return tNode.index - HEADER_OFFSET;\n}\n\n/**\n * Check whether a given node exists, but is disconnected from the DOM.\n *\n * Note: we leverage the fact that we have this information available in the DOM emulation\n * layer (in Domino) for now. 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Used in error\n * messages in dev mode.\n */\nfunction stringifyNavigationInstructions(instructions: (number|NodeNavigationStep)[]): string {\n  const container = [];\n  for (let i = 0; i < instructions.length; i += 2) {\n    const step = instructions[i];\n    const repeat = instructions[i + 1] as number;\n    for (let r = 0; r < repeat; r++) {\n      container.push(step === NodeNavigationStep.FirstChild ? 'firstChild' : 'nextSibling');\n    }\n  }\n  return container.join('.');\n}\n\n/**\n * Helper function that navigates from a starting point node (the `from` node)\n * using provided set of navigation instructions (within `path` argument).\n */\nfunction navigateToNode(from: Node, instructions: (number|NodeNavigationStep)[]): RNode {\n  let node = from;\n  for (let i = 0; i < instructions.length; i += 2) {\n    const step = instructions[i];\n    const repeat = instructions[i + 1] as number;\n    for (let r = 0; r < repeat; r++) {\n      if (ngDevMode && !node) {\n        throw nodeNotFoundAtPathError(from, stringifyNavigationInstructions(instructions));\n      }\n      switch (step) {\n        case NodeNavigationStep.FirstChild:\n          node = node.firstChild!;\n          break;\n        case NodeNavigationStep.NextSibling:\n          node = node.nextSibling!;\n          break;\n      }\n    }\n  }\n  if (ngDevMode && !node) {\n    throw nodeNotFoundAtPathError(from, stringifyNavigationInstructions(instructions));\n  }\n  return node as RNode;\n}\n\n/**\n * Locates an RNode given a set of navigation instructions (which also contains\n * a starting point node info).\n */\nfunction locateRNodeByPath(path: string, lView: LView): RNode {\n  const [referenceNode, ...navigationInstructions] = decompressNodeLocation(path);\n  let ref: Element;\n  if (referenceNode === REFERENCE_NODE_HOST) {\n    ref = lView[DECLARATION_COMPONENT_VIEW][HOST] as unknown as Element;\n  } else if (referenceNode === REFERENCE_NODE_BODY) {\n    ref = ɵɵresolveBody(\n        lView[DECLARATION_COMPONENT_VIEW][HOST] as RElement & {ownerDocument: Document});\n  } else {\n    const parentElementId = Number(referenceNode);\n    ref = unwrapRNode((lView as any)[parentElementId + HEADER_OFFSET]) as Element;\n  }\n  return navigateToNode(ref, navigationInstructions);\n}\n\n/**\n * Generate a list of DOM navigation operations to get from node `start` to node `finish`.\n *\n * Note: assumes that node `start` occurs before node `finish` in an in-order traversal of the DOM\n * tree. That is, we should be able to get from `start` to `finish` purely by using `.firstChild`\n * and `.nextSibling` operations.\n */\nexport function navigateBetween(start: Node, finish: Node): NodeNavigationStep[]|null {\n  if (start === finish) {\n    return [];\n  } else if (start.parentElement == null || finish.parentElement == null) {\n    return null;\n  } else if (start.parentElement === finish.parentElement) {\n    return navigateBetweenSiblings(start, finish);\n  } else {\n    // `finish` is a child of its parent, so the parent will always have a child.\n    const parent = finish.parentElement!;\n\n    const parentPath = navigateBetween(start, parent);\n    const childPath = navigateBetween(parent.firstChild!, finish);\n    if (!parentPath || !childPath) return null;\n\n    return [\n      // First navigate to `finish`'s parent\n      ...parentPath,\n      // Then to its first child.\n      NodeNavigationStep.FirstChild,\n      // And finally from that node to `finish` (maybe a no-op if we're already there).\n      ...childPath,\n    ];\n  }\n}\n\n/**\n * Calculates a path between 2 sibling nodes (generates a number of `NextSibling` navigations).\n * Returns `null` if no such path exists between the given nodes.\n */\nfunction navigateBetweenSiblings(start: Node, finish: Node): NodeNavigationStep[]|null {\n  const nav: NodeNavigationStep[] = [];\n  let node: Node|null = null;\n  for (node = start; node != null && node !== finish; node = node.nextSibling) {\n    nav.push(NodeNavigationStep.NextSibling);\n  }\n  // If the `node` becomes `null` or `undefined` at the end, that means that we\n  // didn't find the `end` node, thus return `null` (which would trigger serialization\n  // error to be produced).\n  return node == null ? null : nav;\n}\n\n/**\n * Calculates a path between 2 nodes in terms of `nextSibling` and `firstChild`\n * navigations:\n * - the `from` node is a known node, used as an starting point for the lookup\n *   (the `fromNodeName` argument is a string representation of the node).\n * - the `to` node is a node that the runtime logic would be looking up,\n *   using the path generated by this function.\n */\nexport function calcPathBetween(from: Node, to: Node, fromNodeName: string): string|null {\n  const path = navigateBetween(from, to);\n  return path === null ? null : compressNodeLocation(fromNodeName, path);\n}\n\n/**\n * Invoked at serialization time (on the server) when a set of navigation\n * instructions needs to be generated for a TNode.\n */\nexport function calcPathForNode(tNode: TNode, lView: LView): string {\n  let parentTNode = tNode.parent;\n  let parentIndex: number|string;\n  let parentRNode: RNode;\n  let referenceNodeName: string;\n\n  // Skip over all parent nodes that are disconnected from the DOM, such nodes\n  // can not be used as anchors.\n  //\n  // This might happen in certain content projection-based use-cases, where\n  // a content of an element is projected and used, when a parent element\n  // itself remains detached from DOM. In this scenario we try to find a parent\n  // element that is attached to DOM and can act as an anchor instead.\n  while (parentTNode !== null && isDisconnectedNode(parentTNode, lView)) {\n    parentTNode = parentTNode.parent;\n  }\n\n  if (parentTNode === null || !(parentTNode.type & TNodeType.AnyRNode)) {\n    // If there is no parent TNode or a parent TNode does not represent an RNode\n    // (i.e. not a DOM node), use component host element as a reference node.\n    parentIndex = referenceNodeName = REFERENCE_NODE_HOST;\n    parentRNode = lView[DECLARATION_COMPONENT_VIEW][HOST]!;\n  } else {\n    // Use parent TNode as a reference node.\n    parentIndex = parentTNode.index;\n    parentRNode = unwrapRNode(lView[parentIndex]);\n    referenceNodeName = renderStringify(parentIndex - HEADER_OFFSET);\n  }\n  let rNode = unwrapRNode(lView[tNode.index]);\n  if (tNode.type & TNodeType.AnyContainer) {\n    // For <ng-container> nodes, instead of serializing a reference\n    // to the anchor comment node, serialize a location of the first\n    // DOM element. Paired with the container size (serialized as a part\n    // of `ngh.containers`), it should give enough information for runtime\n    // to hydrate nodes in this container.\n    const firstRNode = getFirstNativeNode(lView, tNode);\n\n    // If container is not empty, use a reference to the first element,\n    // otherwise, rNode would point to an anchor comment node.\n    if (firstRNode) {\n      rNode = firstRNode;\n    }\n  }\n  let path: string|null = calcPathBetween(parentRNode as Node, rNode as Node, referenceNodeName);\n  if (path === null && parentRNode !== rNode) {\n    // Searching for a path between elements within a host node failed.\n    // Trying to find a path to an element starting from the `document.body` instead.\n    //\n    // Important note: this type of reference is relatively unstable, since Angular\n    // may not be able to control parts of the page that the runtime logic navigates\n    // through. This is mostly needed to cover \"portals\" use-case (like menus, dialog boxes,\n    // etc), where nodes are content-projected (including direct DOM manipulations) outside\n    // of the host node. The better solution is to provide APIs to work with \"portals\",\n    // at which point this code path would not be needed.\n    const body = (parentRNode as Node).ownerDocument!.body as Node;\n    path = calcPathBetween(body, rNode as Node, REFERENCE_NODE_BODY);\n\n    if (path === null) {\n      // If the path is still empty, it's likely that this node is detached and\n      // won't be found during hydration.\n      throw nodeNotFoundError(lView, tNode);\n    }\n  }\n  return path!;\n}\n"]}