ref: dfab56b94698b9ebb5291931a9f67c6cebac8881
dir: /domino-lib/Node.js/
"use strict";
module.exports = Node;
var EventTarget = require('./EventTarget');
var LinkedList = require('./LinkedList');
var NodeUtils = require('./NodeUtils');
var utils = require('./utils');
// All nodes have a nodeType and an ownerDocument.
// Once inserted, they also have a parentNode.
// This is an abstract class; all nodes in a document are instances
// of a subtype, so all the properties are defined by more specific
// constructors.
function Node() {
EventTarget.call(this);
this.parentNode = null;
this._nextSibling = this._previousSibling = this;
this._index = undefined;
}
var ELEMENT_NODE = Node.ELEMENT_NODE = 1;
var ATTRIBUTE_NODE = Node.ATTRIBUTE_NODE = 2;
var TEXT_NODE = Node.TEXT_NODE = 3;
var CDATA_SECTION_NODE = Node.CDATA_SECTION_NODE = 4;
var ENTITY_REFERENCE_NODE = Node.ENTITY_REFERENCE_NODE = 5;
var ENTITY_NODE = Node.ENTITY_NODE = 6;
var PROCESSING_INSTRUCTION_NODE = Node.PROCESSING_INSTRUCTION_NODE = 7;
var COMMENT_NODE = Node.COMMENT_NODE = 8;
var DOCUMENT_NODE = Node.DOCUMENT_NODE = 9;
var DOCUMENT_TYPE_NODE = Node.DOCUMENT_TYPE_NODE = 10;
var DOCUMENT_FRAGMENT_NODE = Node.DOCUMENT_FRAGMENT_NODE = 11;
var NOTATION_NODE = Node.NOTATION_NODE = 12;
var DOCUMENT_POSITION_DISCONNECTED = Node.DOCUMENT_POSITION_DISCONNECTED = 0x01;
var DOCUMENT_POSITION_PRECEDING = Node.DOCUMENT_POSITION_PRECEDING = 0x02;
var DOCUMENT_POSITION_FOLLOWING = Node.DOCUMENT_POSITION_FOLLOWING = 0x04;
var DOCUMENT_POSITION_CONTAINS = Node.DOCUMENT_POSITION_CONTAINS = 0x08;
var DOCUMENT_POSITION_CONTAINED_BY = Node.DOCUMENT_POSITION_CONTAINED_BY = 0x10;
var DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = Node.DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20;
Node.prototype = Object.create(EventTarget.prototype, {
// Node that are not inserted into the tree inherit a null parent
// XXX: the baseURI attribute is defined by dom core, but
// a correct implementation of it requires HTML features, so
// we'll come back to this later.
baseURI: { get: utils.nyi },
parentElement: { get: function() {
return (this.parentNode && this.parentNode.nodeType===ELEMENT_NODE) ? this.parentNode : null;
}},
hasChildNodes: { value: utils.shouldOverride },
firstChild: { get: utils.shouldOverride },
lastChild: { get: utils.shouldOverride },
previousSibling: { get: function() {
var parent = this.parentNode;
if (!parent) return null;
if (this === parent.firstChild) return null;
return this._previousSibling;
}},
nextSibling: { get: function() {
var parent = this.parentNode, next = this._nextSibling;
if (!parent) return null;
if (next === parent.firstChild) return null;
return next;
}},
textContent: {
// Should override for DocumentFragment/Element/Attr/Text/PI/Comment
get: function() { return null; },
set: function(v) { /* do nothing */ },
},
_countChildrenOfType: { value: function(type) {
var sum = 0;
for (var kid = this.firstChild; kid !== null; kid = kid.nextSibling) {
if (kid.nodeType === type) sum++;
}
return sum;
}},
_ensureInsertValid: { value: function _ensureInsertValid(node, child, isPreinsert) {
var parent = this, i, kid;
if (!node.nodeType) throw new TypeError('not a node');
// 1. If parent is not a Document, DocumentFragment, or Element
// node, throw a HierarchyRequestError.
switch (parent.nodeType) {
case DOCUMENT_NODE:
case DOCUMENT_FRAGMENT_NODE:
case ELEMENT_NODE:
break;
default: utils.HierarchyRequestError();
}
// 2. If node is a host-including inclusive ancestor of parent,
// throw a HierarchyRequestError.
if (node.isAncestor(parent)) utils.HierarchyRequestError();
// 3. If child is not null and its parent is not parent, then
// throw a NotFoundError. (replaceChild omits the 'child is not null'
// and throws a TypeError here if child is null.)
if (child !== null || !isPreinsert) {
if (child.parentNode !== parent) utils.NotFoundError();
}
// 4. If node is not a DocumentFragment, DocumentType, Element,
// Text, ProcessingInstruction, or Comment node, throw a
// HierarchyRequestError.
switch (node.nodeType) {
case DOCUMENT_FRAGMENT_NODE:
case DOCUMENT_TYPE_NODE:
case ELEMENT_NODE:
case TEXT_NODE:
case PROCESSING_INSTRUCTION_NODE:
case COMMENT_NODE:
break;
default: utils.HierarchyRequestError();
}
// 5. If either node is a Text node and parent is a document, or
// node is a doctype and parent is not a document, throw a
// HierarchyRequestError.
// 6. If parent is a document, and any of the statements below, switched
// on node, are true, throw a HierarchyRequestError.
if (parent.nodeType === DOCUMENT_NODE) {
switch (node.nodeType) {
case TEXT_NODE:
utils.HierarchyRequestError();
break;
case DOCUMENT_FRAGMENT_NODE:
// 6a1. If node has more than one element child or has a Text
// node child.
if (node._countChildrenOfType(TEXT_NODE) > 0)
utils.HierarchyRequestError();
switch (node._countChildrenOfType(ELEMENT_NODE)) {
case 0:
break;
case 1:
// 6a2. Otherwise, if node has one element child and either
// parent has an element child, child is a doctype, or child
// is not null and a doctype is following child. [preinsert]
// 6a2. Otherwise, if node has one element child and either
// parent has an element child that is not child or a
// doctype is following child. [replaceWith]
if (child !== null /* always true here for replaceWith */) {
if (isPreinsert && child.nodeType === DOCUMENT_TYPE_NODE)
utils.HierarchyRequestError();
for (kid = child.nextSibling; kid !== null; kid = kid.nextSibling) {
if (kid.nodeType === DOCUMENT_TYPE_NODE)
utils.HierarchyRequestError();
}
}
i = parent._countChildrenOfType(ELEMENT_NODE);
if (isPreinsert) {
// "parent has an element child"
if (i > 0)
utils.HierarchyRequestError();
} else {
// "parent has an element child that is not child"
if (i > 1 || (i === 1 && child.nodeType !== ELEMENT_NODE))
utils.HierarchyRequestError();
}
break;
default: // 6a1, continued. (more than one Element child)
utils.HierarchyRequestError();
}
break;
case ELEMENT_NODE:
// 6b. parent has an element child, child is a doctype, or
// child is not null and a doctype is following child. [preinsert]
// 6b. parent has an element child that is not child or a
// doctype is following child. [replaceWith]
if (child !== null /* always true here for replaceWith */) {
if (isPreinsert && child.nodeType === DOCUMENT_TYPE_NODE)
utils.HierarchyRequestError();
for (kid = child.nextSibling; kid !== null; kid = kid.nextSibling) {
if (kid.nodeType === DOCUMENT_TYPE_NODE)
utils.HierarchyRequestError();
}
}
i = parent._countChildrenOfType(ELEMENT_NODE);
if (isPreinsert) {
// "parent has an element child"
if (i > 0)
utils.HierarchyRequestError();
} else {
// "parent has an element child that is not child"
if (i > 1 || (i === 1 && child.nodeType !== ELEMENT_NODE))
utils.HierarchyRequestError();
}
break;
case DOCUMENT_TYPE_NODE:
// 6c. parent has a doctype child, child is non-null and an
// element is preceding child, or child is null and parent has
// an element child. [preinsert]
// 6c. parent has a doctype child that is not child, or an
// element is preceding child. [replaceWith]
if (child === null) {
if (parent._countChildrenOfType(ELEMENT_NODE))
utils.HierarchyRequestError();
} else {
// child is always non-null for [replaceWith] case
for (kid = parent.firstChild; kid !== null; kid = kid.nextSibling) {
if (kid === child) break;
if (kid.nodeType === ELEMENT_NODE)
utils.HierarchyRequestError();
}
}
i = parent._countChildrenOfType(DOCUMENT_TYPE_NODE);
if (isPreinsert) {
// "parent has an doctype child"
if (i > 0)
utils.HierarchyRequestError();
} else {
// "parent has an doctype child that is not child"
if (i > 1 || (i === 1 && child.nodeType !== DOCUMENT_TYPE_NODE))
utils.HierarchyRequestError();
}
break;
}
} else {
// 5, continued: (parent is not a document)
if (node.nodeType === DOCUMENT_TYPE_NODE) utils.HierarchyRequestError();
}
}},
insertBefore: { value: function insertBefore(node, child) {
var parent = this;
// 1. Ensure pre-insertion validity
parent._ensureInsertValid(node, child, true);
// 2. Let reference child be child.
var refChild = child;
// 3. If reference child is node, set it to node's next sibling
if (refChild === node) { refChild = node.nextSibling; }
// 4. Adopt node into parent's node document.
parent.doc.adoptNode(node);
// 5. Insert node into parent before reference child.
node._insertOrReplace(parent, refChild, false);
// 6. Return node
return node;
}},
appendChild: { value: function(child) {
// This invokes _appendChild after doing validity checks.
return this.insertBefore(child, null);
}},
_appendChild: { value: function(child) {
child._insertOrReplace(this, null, false);
}},
removeChild: { value: function removeChild(child) {
var parent = this;
if (!child.nodeType) throw new TypeError('not a node');
if (child.parentNode !== parent) utils.NotFoundError();
child.remove();
return child;
}},
// To replace a `child` with `node` within a `parent` (this)
replaceChild: { value: function replaceChild(node, child) {
var parent = this;
// Ensure validity (slight differences from pre-insertion check)
parent._ensureInsertValid(node, child, false);
// Adopt node into parent's node document.
if (node.doc !== parent.doc) {
// XXX adoptNode has side-effect of removing node from its parent
// and generating a mutation event, thus causing the _insertOrReplace
// to generate two deletes and an insert instead of a 'move'
// event. It looks like the new MutationObserver stuff avoids
// this problem, but for now let's only adopt (ie, remove `node`
// from its parent) here if we need to.
parent.doc.adoptNode(node);
}
// Do the replace.
node._insertOrReplace(parent, child, true);
return child;
}},
// See: http://ejohn.org/blog/comparing-document-position/
contains: { value: function contains(node) {
if (node === null) { return false; }
if (this === node) { return true; /* inclusive descendant */ }
/* jshint bitwise: false */
return (this.compareDocumentPosition(node) &
DOCUMENT_POSITION_CONTAINED_BY) !== 0;
}},
compareDocumentPosition: { value: function compareDocumentPosition(that){
// Basic algorithm for finding the relative position of two nodes.
// Make a list the ancestors of each node, starting with the
// document element and proceeding down to the nodes themselves.
// Then, loop through the lists, looking for the first element
// that differs. The order of those two elements give the
// order of their descendant nodes. Or, if one list is a prefix
// of the other one, then that node contains the other.
if (this === that) return 0;
// If they're not owned by the same document or if one is rooted
// and one is not, then they're disconnected.
if (this.doc !== that.doc ||
this.rooted !== that.rooted)
return (DOCUMENT_POSITION_DISCONNECTED +
DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC);
// Get arrays of ancestors for this and that
var these = [], those = [];
for(var n = this; n !== null; n = n.parentNode) these.push(n);
for(n = that; n !== null; n = n.parentNode) those.push(n);
these.reverse(); // So we start with the outermost
those.reverse();
if (these[0] !== those[0]) // No common ancestor
return (DOCUMENT_POSITION_DISCONNECTED +
DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC);
n = Math.min(these.length, those.length);
for(var i = 1; i < n; i++) {
if (these[i] !== those[i]) {
// We found two different ancestors, so compare
// their positions
if (these[i].index < those[i].index)
return DOCUMENT_POSITION_FOLLOWING;
else
return DOCUMENT_POSITION_PRECEDING;
}
}
// If we get to here, then one of the nodes (the one with the
// shorter list of ancestors) contains the other one.
if (these.length < those.length)
return (DOCUMENT_POSITION_FOLLOWING +
DOCUMENT_POSITION_CONTAINED_BY);
else
return (DOCUMENT_POSITION_PRECEDING +
DOCUMENT_POSITION_CONTAINS);
}},
isSameNode: {value : function isSameNode(node) {
return this === node;
}},
// This method implements the generic parts of node equality testing
// and defers to the (non-recursive) type-specific isEqual() method
// defined by subclasses
isEqualNode: { value: function isEqualNode(node) {
if (!node) return false;
if (node.nodeType !== this.nodeType) return false;
// Check type-specific properties for equality
if (!this.isEqual(node)) return false;
// Now check children for number and equality
for (var c1 = this.firstChild, c2 = node.firstChild;
c1 && c2;
c1 = c1.nextSibling, c2 = c2.nextSibling) {
if (!c1.isEqualNode(c2)) return false;
}
return c1 === null && c2 === null;
}},
// This method delegates shallow cloning to a clone() method
// that each concrete subclass must implement
cloneNode: { value: function(deep) {
// Clone this node
var clone = this.clone();
// Handle the recursive case if necessary
if (deep) {
for (var kid = this.firstChild; kid !== null; kid = kid.nextSibling) {
clone._appendChild(kid.cloneNode(true));
}
}
return clone;
}},
lookupPrefix: { value: function lookupPrefix(ns) {
var e;
if (ns === '' || ns === null || ns === undefined) return null;
switch(this.nodeType) {
case ELEMENT_NODE:
return this._lookupNamespacePrefix(ns, this);
case DOCUMENT_NODE:
e = this.documentElement;
return e ? e.lookupPrefix(ns) : null;
case ENTITY_NODE:
case NOTATION_NODE:
case DOCUMENT_FRAGMENT_NODE:
case DOCUMENT_TYPE_NODE:
return null;
case ATTRIBUTE_NODE:
e = this.ownerElement;
return e ? e.lookupPrefix(ns) : null;
default:
e = this.parentElement;
return e ? e.lookupPrefix(ns) : null;
}
}},
lookupNamespaceURI: {value: function lookupNamespaceURI(prefix) {
if (prefix === '' || prefix === undefined) { prefix = null; }
var e;
switch(this.nodeType) {
case ELEMENT_NODE:
return utils.shouldOverride();
case DOCUMENT_NODE:
e = this.documentElement;
return e ? e.lookupNamespaceURI(prefix) : null;
case ENTITY_NODE:
case NOTATION_NODE:
case DOCUMENT_TYPE_NODE:
case DOCUMENT_FRAGMENT_NODE:
return null;
case ATTRIBUTE_NODE:
e = this.ownerElement;
return e ? e.lookupNamespaceURI(prefix) : null;
default:
e = this.parentElement;
return e ? e.lookupNamespaceURI(prefix) : null;
}
}},
isDefaultNamespace: { value: function isDefaultNamespace(ns) {
if (ns === '' || ns === undefined) { ns = null; }
var defaultNamespace = this.lookupNamespaceURI(null);
return (defaultNamespace === ns);
}},
// Utility methods for nodes. Not part of the DOM
// Return the index of this node in its parent.
// Throw if no parent, or if this node is not a child of its parent
index: { get: function() {
var parent = this.parentNode;
if (this === parent.firstChild) return 0; // fast case
var kids = parent.childNodes;
if (this._index === undefined || kids[this._index] !== this) {
// Ensure that we don't have an O(N^2) blowup if none of the
// kids have defined indices yet and we're traversing via
// nextSibling or previousSibling
for (var i=0; i<kids.length; i++) {
kids[i]._index = i;
}
utils.assert(kids[this._index] === this);
}
return this._index;
}},
// Return true if this node is equal to or is an ancestor of that node
// Note that nodes are considered to be ancestors of themselves
isAncestor: { value: function(that) {
// If they belong to different documents, then they're unrelated.
if (this.doc !== that.doc) return false;
// If one is rooted and one isn't then they're not related
if (this.rooted !== that.rooted) return false;
// Otherwise check by traversing the parentNode chain
for(var e = that; e; e = e.parentNode) {
if (e === this) return true;
}
return false;
}},
// DOMINO Changed the behavior to conform with the specs. See:
// https://groups.google.com/d/topic/mozilla.dev.platform/77sIYcpdDmc/discussion
ensureSameDoc: { value: function(that) {
if (that.ownerDocument === null) {
that.ownerDocument = this.doc;
}
else if(that.ownerDocument !== this.doc) {
utils.WrongDocumentError();
}
}},
removeChildren: { value: utils.shouldOverride },
// Insert this node as a child of parent before the specified child,
// or insert as the last child of parent if specified child is null,
// or replace the specified child with this node, firing mutation events as
// necessary
_insertOrReplace: { value: function _insertOrReplace(parent, before, isReplace) {
var child = this, before_index, i;
if (child.nodeType === DOCUMENT_FRAGMENT_NODE && child.rooted) {
utils.HierarchyRequestError();
}
/* Ensure index of `before` is cached before we (possibly) remove it. */
if (parent._childNodes) {
before_index = (before === null) ? parent._childNodes.length :
before.index; /* ensure _index is cached */
// If we are already a child of the specified parent, then
// the index may have to be adjusted.
if (child.parentNode === parent) {
var child_index = child.index;
// If the child is before the spot it is to be inserted at,
// then when it is removed, the index of that spot will be
// reduced.
if (child_index < before_index) {
before_index--;
}
}
}
// Delete the old child
if (isReplace) {
if (before.rooted) before.doc.mutateRemove(before);
before.parentNode = null;
}
var n = before;
if (n === null) { n = parent.firstChild; }
// If both the child and the parent are rooted, then we want to
// transplant the child without uprooting and rerooting it.
var bothRooted = child.rooted && parent.rooted;
if (child.nodeType === DOCUMENT_FRAGMENT_NODE) {
var spliceArgs = [0, isReplace ? 1 : 0], next;
for (var kid = child.firstChild; kid !== null; kid = next) {
next = kid.nextSibling;
spliceArgs.push(kid);
kid.parentNode = parent;
}
var len = spliceArgs.length;
// Add all nodes to the new parent, overwriting the old child
if (isReplace) {
LinkedList.replace(n, len > 2 ? spliceArgs[2] : null);
} else if (len > 2 && n !== null) {
LinkedList.insertBefore(spliceArgs[2], n);
}
if (parent._childNodes) {
spliceArgs[0] = (before === null) ?
parent._childNodes.length : before._index;
parent._childNodes.splice.apply(parent._childNodes, spliceArgs);
for (i=2; i<len; i++) {
spliceArgs[i]._index = spliceArgs[0] + (i - 2);
}
} else if (parent._firstChild === before) {
if (len > 2) {
parent._firstChild = spliceArgs[2];
} else if (isReplace) {
parent._firstChild = null;
}
}
// Remove all nodes from the document fragment
if (child._childNodes) {
child._childNodes.length = 0;
} else {
child._firstChild = null;
}
// Call the mutation handlers
// Use spliceArgs since the original array has been destroyed. The
// liveness guarantee requires us to clone the array so that
// references to the childNodes of the DocumentFragment will be empty
// when the insertion handlers are called.
if (parent.rooted) {
parent.modify();
for (i = 2; i < len; i++) {
parent.doc.mutateInsert(spliceArgs[i]);
}
}
} else {
if (before === child) { return; }
if (bothRooted) {
// Remove the child from its current position in the tree
// without calling remove(), since we don't want to uproot it.
child._remove();
} else if (child.parentNode) {
child.remove();
}
// Insert it as a child of its new parent
child.parentNode = parent;
if (isReplace) {
LinkedList.replace(n, child);
if (parent._childNodes) {
child._index = before_index;
parent._childNodes[before_index] = child;
} else if (parent._firstChild === before) {
parent._firstChild = child;
}
} else {
if (n !== null) {
LinkedList.insertBefore(child, n);
}
if (parent._childNodes) {
child._index = before_index;
parent._childNodes.splice(before_index, 0, child);
} else if (parent._firstChild === before) {
parent._firstChild = child;
}
}
if (bothRooted) {
parent.modify();
// Generate a move mutation event
parent.doc.mutateMove(child);
} else if (parent.rooted) {
parent.modify();
parent.doc.mutateInsert(child);
}
}
}},
// Return the lastModTime value for this node. (For use as a
// cache invalidation mechanism. If the node does not already
// have one, initialize it from the owner document's modclock
// property. (Note that modclock does not return the actual
// time; it is simply a counter incremented on each document
// modification)
lastModTime: { get: function() {
if (!this._lastModTime) {
this._lastModTime = this.doc.modclock;
}
return this._lastModTime;
}},
// Increment the owner document's modclock and use the new
// value to update the lastModTime value for this node and
// all of its ancestors. Nodes that have never had their
// lastModTime value queried do not need to have a
// lastModTime property set on them since there is no
// previously queried value to ever compare the new value
// against, so only update nodes that already have a
// _lastModTime property.
modify: { value: function() {
if (this.doc.modclock) { // Skip while doc.modclock == 0
var time = ++this.doc.modclock;
for(var n = this; n; n = n.parentElement) {
if (n._lastModTime) {
n._lastModTime = time;
}
}
}
}},
// This attribute is not part of the DOM but is quite helpful.
// It returns the document with which a node is associated. Usually
// this is the ownerDocument. But ownerDocument is null for the
// document object itself, so this is a handy way to get the document
// regardless of the node type
doc: { get: function() {
return this.ownerDocument || this;
}},
// If the node has a nid (node id), then it is rooted in a document
rooted: { get: function() {
return !!this._nid;
}},
normalize: { value: function() {
var next;
for (var child=this.firstChild; child !== null; child=next) {
next = child.nextSibling;
if (child.normalize) {
child.normalize();
}
if (child.nodeType !== Node.TEXT_NODE) {
continue;
}
if (child.nodeValue === "") {
this.removeChild(child);
continue;
}
var prevChild = child.previousSibling;
if (prevChild === null) {
continue;
} else if (prevChild.nodeType === Node.TEXT_NODE) {
// merge this with previous and remove the child
prevChild.appendData(child.nodeValue);
this.removeChild(child);
}
}
}},
// Convert the children of a node to an HTML string.
// This is used by the innerHTML getter
// The serialization spec is at:
// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#serializing-html-fragments
//
// The serialization logic is intentionally implemented in a separate
// `NodeUtils` helper instead of the more obvious choice of a private
// `_serializeOne()` method on the `Node.prototype` in order to avoid
// the megamorphic `this._serializeOne` property access, which reduces
// performance unnecessarily. If you need specialized behavior for a
// certain subclass, you'll need to implement that in `NodeUtils`.
// See https://github.com/fgnass/domino/pull/142 for more information.
serialize: { value: function() {
var s = '';
for (var kid = this.firstChild; kid !== null; kid = kid.nextSibling) {
s += NodeUtils.serializeOne(kid, this);
}
return s;
}},
// Non-standard, but often useful for debugging.
outerHTML: {
get: function() {
return NodeUtils.serializeOne(this, { nodeType: 0 });
},
set: utils.nyi,
},
// mirror node type properties in the prototype, so they are present
// in instances of Node (and subclasses)
ELEMENT_NODE: { value: ELEMENT_NODE },
ATTRIBUTE_NODE: { value: ATTRIBUTE_NODE },
TEXT_NODE: { value: TEXT_NODE },
CDATA_SECTION_NODE: { value: CDATA_SECTION_NODE },
ENTITY_REFERENCE_NODE: { value: ENTITY_REFERENCE_NODE },
ENTITY_NODE: { value: ENTITY_NODE },
PROCESSING_INSTRUCTION_NODE: { value: PROCESSING_INSTRUCTION_NODE },
COMMENT_NODE: { value: COMMENT_NODE },
DOCUMENT_NODE: { value: DOCUMENT_NODE },
DOCUMENT_TYPE_NODE: { value: DOCUMENT_TYPE_NODE },
DOCUMENT_FRAGMENT_NODE: { value: DOCUMENT_FRAGMENT_NODE },
NOTATION_NODE: { value: NOTATION_NODE },
DOCUMENT_POSITION_DISCONNECTED: { value: DOCUMENT_POSITION_DISCONNECTED },
DOCUMENT_POSITION_PRECEDING: { value: DOCUMENT_POSITION_PRECEDING },
DOCUMENT_POSITION_FOLLOWING: { value: DOCUMENT_POSITION_FOLLOWING },
DOCUMENT_POSITION_CONTAINS: { value: DOCUMENT_POSITION_CONTAINS },
DOCUMENT_POSITION_CONTAINED_BY: { value: DOCUMENT_POSITION_CONTAINED_BY },
DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: { value: DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC },
});