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Document as XmlDocument,
Element as XmlElement,
Node as XmlNode,
} from '@xmldom/xmldom';
import { FLOWABLE_ATTRIBUTE_KEYS } from '../types';
import { XMLNS_NAMESPACE } from './constants';
import {
buildXmlIdentity,
detachNode,
getElementChildren,
getLocalName,
getNodeDocument,
insertAfter,
isSameElementType,
serializer,
setTextContentPreservingComments,
} from './xmlUtils';
const editableActivitiAttributes = new Set(FLOWABLE_ATTRIBUTE_KEYS.map((key) => `activiti:${key}`));
const editableLegacyAttributes = new Set(FLOWABLE_ATTRIBUTE_KEYS);
const overlayManagedChildNames = new Set([
'extensionElements',
'documentation',
'conditionExpression',
'script',
'multiInstanceLoopCharacteristics',
]);
interface NodePlacement {
node: XmlNode;
existedHere: boolean;
}
export interface StructuralMergeContext {
originalById: Map<string, XmlElement>;
preserveUnmatchedLexicalNodes: boolean;
}
function shouldPreserveUnmatchedLexicalNodes(sourceHasLexicalNodes: boolean, context: StructuralMergeContext): boolean {
return context.preserveUnmatchedLexicalNodes && !sourceHasLexicalNodes;
}
function shouldSyncStructuralAttribute(attributeName: string): boolean {
return !editableActivitiAttributes.has(attributeName) && !editableLegacyAttributes.has(attributeName as typeof FLOWABLE_ATTRIBUTE_KEYS[number]);
}
function applySourceStructuralAttributes(target: XmlElement, source: XmlElement): Map<string, string> {
const sourceAttributes = new Map<string, string>();
for (const attribute of Array.from(source.attributes)) {
if (!shouldSyncStructuralAttribute(attribute.name)) {
continue;
}
sourceAttributes.set(attribute.name, attribute.value);
if (attribute.name === 'xmlns' || attribute.name.startsWith('xmlns:')) {
target.setAttributeNS(XMLNS_NAMESPACE, attribute.name, attribute.value);
continue;
}
target.setAttribute(attribute.name, attribute.value);
}
return sourceAttributes;
}
function removeMissingStructuralAttributes(target: XmlElement, sourceAttributes: Map<string, string>): void {
for (const attribute of Array.from(target.attributes)) {
if (!shouldSyncStructuralAttribute(attribute.name) || sourceAttributes.has(attribute.name)) {
continue;
}
Iif (attribute.name === 'xmlns') {
target.removeAttribute('xmlns');
continue;
}
if (attribute.name.startsWith('xmlns:')) {
target.removeAttributeNS(XMLNS_NAMESPACE, attribute.localName || attribute.name.slice(6));
continue;
}
target.removeAttribute(attribute.name);
}
}
export function syncStructuralAttributes(target: XmlElement, source: XmlElement): void {
const sourceAttributes = applySourceStructuralAttributes(target, source);
removeMissingStructuralAttributes(target, sourceAttributes);
}
function isStructuralChild(parent: XmlElement, child: XmlElement): boolean {
const childLocalName = getLocalName(child);
if (overlayManagedChildNames.has(childLocalName)) {
return false;
}
const parentLocalName = getLocalName(parent);
if (parentLocalName === 'definitions' && (childLocalName === 'signal' || childLocalName === 'message')) {
return false;
}
if (parentLocalName === 'process' && childLocalName === 'dataObject') {
return false;
}
return true;
}
function getStructuralChildKey(parent: XmlElement, child: XmlElement): string {
const id = child.getAttribute('id');
if (id) {
return `id:${child.namespaceURI || ''}:${getLocalName(child)}:${id}`;
}
return buildXmlIdentity(`structural:${getLocalName(parent)}`, child);
}
function maybeSyncLeafText(target: XmlElement, source: XmlElement): void {
const sourceElements = getElementChildren(source);
const targetElements = getElementChildren(target);
if (sourceElements.length > 0 || targetElements.length > 0) {
return;
}
const sourceHasComments = Array.from(source.childNodes).some((node) => node.nodeType === node.COMMENT_NODE || node.nodeType === node.PROCESSING_INSTRUCTION_NODE);
const targetHasComments = Array.from(target.childNodes).some((node) => node.nodeType === node.COMMENT_NODE || node.nodeType === node.PROCESSING_INSTRUCTION_NODE);
Iif (sourceHasComments || targetHasComments) {
return;
}
const sourceText = source.textContent || '';
const targetText = target.textContent || '';
if (sourceText !== targetText) {
setTextContentPreservingComments(target, sourceText);
}
}
function indexNodeById(idMap: Map<string, XmlElement>, node: XmlNode): void {
if (node.nodeType !== node.ELEMENT_NODE) {
return;
}
const element = node as XmlElement;
const id = element.getAttribute('id');
if (id) {
idMap.set(id, element);
}
for (const child of getElementChildren(element)) {
indexNodeById(idMap, child);
}
}
function removeNodeIds(idMap: Map<string, XmlElement>, node: XmlNode): void {
Iif (node.nodeType !== node.ELEMENT_NODE) {
return;
}
const element = node as XmlElement;
const id = element.getAttribute('id');
if (id) {
idMap.delete(id);
}
for (const child of getElementChildren(element)) {
removeNodeIds(idMap, child);
}
}
function isXmlDeclarationNode(node: XmlNode): boolean {
return node.nodeType === node.PROCESSING_INSTRUCTION_NODE && node.nodeName.toLowerCase() === 'xml';
}
function isStructuralNonElementNode(node: XmlNode): boolean {
Iif (isXmlDeclarationNode(node)) {
return false;
}
if (node.nodeType === node.TEXT_NODE) {
return (node.nodeValue || '').trim().length > 0;
}
return node.nodeType === node.COMMENT_NODE
|| node.nodeType === node.PROCESSING_INSTRUCTION_NODE
|| node.nodeType === node.CDATA_SECTION_NODE
|| node.nodeType === node.DOCUMENT_TYPE_NODE;
}
function isStructuralChildNode(parent: XmlElement, child: XmlNode): boolean {
if (child.nodeType === child.ELEMENT_NODE) {
return isStructuralChild(parent, child as XmlElement);
}
return isStructuralNonElementNode(child);
}
function getNonElementNodeKey(node: XmlNode): string {
switch (node.nodeType) {
case node.TEXT_NODE:
return `text:${node.nodeValue || ''}`;
case node.CDATA_SECTION_NODE:
return `cdata:${node.nodeValue || ''}`;
case node.COMMENT_NODE:
return `comment:${node.nodeValue || ''}`;
case node.PROCESSING_INSTRUCTION_NODE:
return `pi:${node.nodeName}:${node.nodeValue || ''}`;
case node.DOCUMENT_TYPE_NODE:
return `doctype:${serializer.serializeToString(node)}`;
default:
return `node:${node.nodeType}:${serializer.serializeToString(node)}`;
}
}
function getDocumentChildKey(child: XmlNode): string {
if (child.nodeType === child.ELEMENT_NODE) {
const element = child as XmlElement;
return `element:${element.namespaceURI || ''}:${getLocalName(element)}`;
}
return getNonElementNodeKey(child);
}
function getStructuralNodeKey(parent: XmlElement, child: XmlNode): string {
if (child.nodeType === child.ELEMENT_NODE) {
return getStructuralChildKey(parent, child as XmlElement);
}
return getNonElementNodeKey(child);
}
function getElementOrderKey(parent: XmlElement, child: XmlElement): string {
const id = child.getAttribute('id');
if (id) {
return `id:${child.namespaceURI || ''}:${getLocalName(child)}:${id}`;
}
return buildXmlIdentity(`order:${getLocalName(parent)}`, child);
}
function didElementChildOrderChange(target: XmlElement, source: XmlElement): boolean {
const leftKeys = getElementChildren(source).map((child) => getElementOrderKey(target, child));
const rightKeys = getElementChildren(target).map((child) => getElementOrderKey(target, child));
return JSON.stringify(leftKeys) !== JSON.stringify(rightKeys);
}
export function didStructuralElementChildOrderChange(target: XmlElement, source: XmlElement): boolean {
const leftKeys = getElementChildren(source)
.filter((child) => isStructuralChild(source, child))
.map((child) => getElementOrderKey(source, child));
const rightKeys = getElementChildren(target)
.filter((child) => isStructuralChild(target, child))
.map((child) => getElementOrderKey(target, child));
return JSON.stringify(leftKeys) !== JSON.stringify(rightKeys);
}
function didDocumentElementOrderChange(leftChildren: XmlNode[], rightChildren: XmlNode[]): boolean {
const leftKeys = leftChildren.filter((child) => child.nodeType === child.ELEMENT_NODE).map((child) => getDocumentChildKey(child));
const rightKeys = rightChildren.filter((child) => child.nodeType === child.ELEMENT_NODE).map((child) => getDocumentChildKey(child));
return JSON.stringify(leftKeys) !== JSON.stringify(rightKeys);
}
function createNodeBuckets(children: XmlNode[], getKey: (child: XmlNode) => string): Map<string, XmlNode[]> {
const buckets = new Map<string, XmlNode[]>();
for (const child of children) {
const key = getKey(child);
const bucket = buckets.get(key) || [];
bucket.push(child);
buckets.set(key, bucket);
}
return buckets;
}
function takeBucketNode(buckets: Map<string, XmlNode[]>, key: string): XmlNode | undefined {
return buckets.get(key)?.shift();
}
function findNextStableNode(parent: XmlNode, placements: NodePlacement[], index: number): XmlNode | undefined {
return placements.slice(index + 1).find((candidate) => candidate.existedHere && candidate.node.parentNode === parent)?.node;
}
function findPreviousPlacedNode(parent: XmlNode, placements: NodePlacement[], index: number): XmlNode | undefined {
return placements.slice(0, index).reverse().find((candidate) => candidate.node.parentNode === parent)?.node;
}
function findFirstRelevantChild(parent: XmlNode, isRelevant: (child: XmlNode) => boolean, excludedNode: XmlNode): XmlNode | undefined {
return Array.from(parent.childNodes).find((child) => isRelevant(child) && child !== excludedNode);
}
function placeNodes(parent: XmlNode, placements: NodePlacement[], isRelevant: (child: XmlNode) => boolean): void {
for (let index = 0; index < placements.length; index++) {
const placement = placements[index];
if (placement.existedHere) {
continue;
}
const nextStable = findNextStableNode(parent, placements, index);
if (nextStable) {
parent.insertBefore(placement.node, nextStable);
continue;
}
const previousPlaced = findPreviousPlacedNode(parent, placements, index);
if (previousPlaced) {
insertAfter(parent, placement.node, previousPlaced);
continue;
}
const firstRelevantChild = findFirstRelevantChild(parent, isRelevant, placement.node);
if (firstRelevantChild) {
parent.insertBefore(placement.node, firstRelevantChild);
} else {
parent.appendChild(placement.node);
}
}
}
function resolveDocumentTargetChild(
target: XmlDocument,
sourceChild: XmlNode,
targetChildrenByKey: Map<string, XmlNode[]>,
): NodePlacement {
const targetDocumentElement = target.documentElement;
if (
sourceChild.nodeType === sourceChild.ELEMENT_NODE
&& targetDocumentElement?.nodeType === sourceChild.nodeType
&& isSameElementType(targetDocumentElement, sourceChild as XmlElement)
) {
return { node: targetDocumentElement, existedHere: targetDocumentElement.parentNode === target };
}
const matchedNode = takeBucketNode(targetChildrenByKey, getDocumentChildKey(sourceChild));
if (matchedNode) {
return { node: matchedNode, existedHere: matchedNode.parentNode === target };
}
const importedNode = target.importNode(sourceChild, true);
return { node: importedNode, existedHere: false };
}
function removeUnkeptDocumentChildren(
target: XmlDocument,
keptChildren: Set<XmlNode>,
sourceHasLexicalNodes: boolean,
documentElementOrderChanged: boolean,
context: StructuralMergeContext,
): void {
for (const child of Array.from(target.childNodes).filter((node) => !isXmlDeclarationNode(node))) {
Iif (!keptChildren.has(child) && child.nodeType !== child.ELEMENT_NODE && shouldPreserveUnmatchedLexicalNodes(sourceHasLexicalNodes, context)) {
continue;
}
const shouldRemove = !keptChildren.has(child)
&& (child.nodeType === child.ELEMENT_NODE || sourceHasLexicalNodes || !documentElementOrderChanged);
if (shouldRemove) {
detachNode(child);
}
}
}
export function syncDocumentLexicalNodes(target: XmlDocument, source: XmlDocument, context: StructuralMergeContext): void {
const sourceChildren = Array.from(source.childNodes).filter((node) => !isXmlDeclarationNode(node));
const targetChildren = Array.from(target.childNodes).filter((node) => !isXmlDeclarationNode(node));
const sourceHasLexicalNodes = sourceChildren.some((node) => node.nodeType !== node.ELEMENT_NODE);
const documentElementOrderChanged = didDocumentElementOrderChange(sourceChildren, targetChildren);
const targetChildrenByKey = createNodeBuckets(targetChildren, getDocumentChildKey);
const keptChildren = new Set<XmlNode>();
const placements = sourceChildren.map((sourceChild) => {
const placement = resolveDocumentTargetChild(target, sourceChild, targetChildrenByKey);
keptChildren.add(placement.node);
return placement;
});
placeNodes(target, placements, (child) => !isXmlDeclarationNode(child));
removeUnkeptDocumentChildren(target, keptChildren, sourceHasLexicalNodes, documentElementOrderChanged, context);
}
function getMatchedStructuralNodeById(sourceElement: XmlElement, context: StructuralMergeContext): XmlNode | undefined {
const id = sourceElement.getAttribute('id');
if (!id) {
return undefined;
}
const matchedById = context.originalById.get(id);
if (matchedById && isSameElementType(matchedById, sourceElement)) {
return matchedById;
}
return undefined;
}
function syncMatchedStructuralElement(targetChild: XmlNode, sourceChild: XmlNode, context: StructuralMergeContext): void {
if (targetChild.nodeType !== targetChild.ELEMENT_NODE || sourceChild.nodeType !== sourceChild.ELEMENT_NODE) {
return;
}
const targetElement = targetChild as XmlElement;
const sourceElement = sourceChild as XmlElement;
syncStructuralAttributes(targetElement, sourceElement);
reconcileStructuralChildren(targetElement, sourceElement, context);
maybeSyncLeafText(targetElement, sourceElement);
}
function resolveStructuralTargetChild(
target: XmlElement,
sourceChild: XmlNode,
targetChildrenByKey: Map<string, XmlNode[]>,
context: StructuralMergeContext,
): NodePlacement {
const sourceElement = sourceChild.nodeType === sourceChild.ELEMENT_NODE ? sourceChild as XmlElement : undefined;
const matchedById = sourceElement ? getMatchedStructuralNodeById(sourceElement, context) : undefined;
if (matchedById) {
syncMatchedStructuralElement(matchedById, sourceChild, context);
return { node: matchedById, existedHere: matchedById.parentNode === target };
}
const matchedByKey = takeBucketNode(targetChildrenByKey, getStructuralNodeKey(target, sourceChild));
if (matchedByKey) {
syncMatchedStructuralElement(matchedByKey, sourceChild, context);
return { node: matchedByKey, existedHere: matchedByKey.parentNode === target };
}
const importedNode = getNodeDocument(target).importNode(sourceChild, true);
indexNodeById(context.originalById, importedNode);
return { node: importedNode, existedHere: false };
}
function removeUnkeptStructuralChildren(
target: XmlElement,
keptChildren: Set<XmlNode>,
sourceHasLexicalNodes: boolean,
elementChildOrderChanged: boolean,
context: StructuralMergeContext,
): void {
for (const child of Array.from(target.childNodes).filter((node) => isStructuralChildNode(target, node))) {
if (keptChildren.has(child)) {
continue;
}
if (child.nodeType === child.ELEMENT_NODE) {
removeNodeIds(context.originalById, child);
detachNode(child);
continue;
}
if (shouldPreserveUnmatchedLexicalNodes(sourceHasLexicalNodes, context)) {
continue;
}
Eif (sourceHasLexicalNodes || !elementChildOrderChanged) {
detachNode(child);
}
}
}
export function reconcileStructuralChildren(target: XmlElement, source: XmlElement, context: StructuralMergeContext): void {
const sourceChildren = Array.from(source.childNodes).filter((child) => isStructuralChildNode(source, child));
const targetChildren = Array.from(target.childNodes).filter((child) => isStructuralChildNode(target, child));
const sourceHasLexicalNodes = sourceChildren.some((child) => child.nodeType !== child.ELEMENT_NODE);
const elementChildOrderChanged = didElementChildOrderChange(target, source);
const targetChildrenByKey = createNodeBuckets(targetChildren, (child) => getStructuralNodeKey(target, child));
const keptChildren = new Set<XmlNode>();
const placements = sourceChildren.map((sourceChild) => {
const placement = resolveStructuralTargetChild(target, sourceChild, targetChildrenByKey, context);
keptChildren.add(placement.node);
return placement;
});
placeNodes(target, placements, (child) => isStructuralChildNode(target, child));
removeUnkeptStructuralChildren(target, keptChildren, sourceHasLexicalNodes, elementChildOrderChanged, context);
}
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