/** * @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 . */ 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; } /** * 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 `
`, which is // represented in the DOM as `
...`. // 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) { const parentTNode = tNode.parent; let parentIndex; let parentRNode; let referenceNodeName; 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 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 * Locate a node in DOM tree that corresponds to a given TNode.\n *\n * @param hydrationInfo The hydration annotation data\n * @param tView the current tView\n * @param lView the current lView\n * @param tNode the current tNode\n * @returns an RNode that represents a given tNode\n */\nexport function locateNextRNode<T extends RNode>(\n    hydrationInfo: DehydratedView, tView: TView, lView: LView<unknown>, tNode: TNode): T|null {\n  let native: RNode|null = null;\n  const noOffsetIndex = getNoOffsetIndex(tNode);\n  const nodes = hydrationInfo.data[NODES];\n  if (nodes?.[noOffsetIndex]) {\n    // We know the exact location of the node.\n    native = locateRNodeByPath(nodes[noOffsetIndex], lView);\n  } else if (tView.firstChild === tNode) {\n    // We create a first node in this view, so we use a reference\n    // to the first child in this DOM segment.\n    native = hydrationInfo.firstChild;\n  } else {\n    // Locate a node based on a previous sibling or a parent node.\n    const previousTNodeParent = tNode.prev === null;\n    const previousTNode = (tNode.prev ?? tNode.parent)!;\n    ngDevMode &&\n        assertDefined(\n            previousTNode,\n            'Unexpected state: current TNode does not have a connection ' +\n                'to the previous node or a parent node.');\n    if (isFirstElementInNgContainer(tNode)) {\n      const noOffsetParentIndex = getNoOffsetIndex(tNode.parent!);\n      native = getSegmentHead(hydrationInfo, 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anchor comment node after all the views in this container.\n          const nodesToSkip = numRootNodesToSkip + 1;\n          // First node after this segment.\n          native = siblingAfter(nodesToSkip, segmentHead);\n        } else {\n          native = previousRElement.nextSibling;\n        }\n      }\n    }\n  }\n  return native as T;\n}\n\n/**\n * Skips over a specified number of nodes and returns the next sibling node after that.\n */\nexport function siblingAfter<T extends RNode>(skip: number, from: RNode): T|null {\n  let currentNode = from;\n  for (let i = 0; i < skip; i++) {\n    ngDevMode && validateSiblingNodeExists(currentNode);\n    currentNode = currentNode.nextSibling!;\n  }\n  return currentNode as T;\n}\n\n/**\n * Helper function to produce a string representation of the navigation steps\n * (in terms of `nextSibling` and `firstChild` navigations). 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  const parentTNode = tNode.parent;\n  let parentIndex: number|string;\n  let parentRNode: RNode;\n  let referenceNodeName: string;\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"]}