diff options
Diffstat (limited to 'legacy/RDFDataSource.jsm')
| -rw-r--r-- | legacy/RDFDataSource.jsm | 1517 |
1 files changed, 0 insertions, 1517 deletions
diff --git a/legacy/RDFDataSource.jsm b/legacy/RDFDataSource.jsm deleted file mode 100644 index 579d075..0000000 --- a/legacy/RDFDataSource.jsm +++ /dev/null @@ -1,1517 +0,0 @@ - /* This Source Code Form is subject to the terms of the Mozilla Public - * License, v. 2.0. If a copy of the MPL was not distributed with this - * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ - -/** - * This module creates a new API for accessing and modifying RDF graphs. The - * goal is to be able to serialise the graph in a human readable form. Also - * if the graph was originally loaded from an RDF/XML the serialisation should - * closely match the original with any new data closely following the existing - * layout. The output should always be compatible with Mozilla's RDF parser. - * - * This is all achieved by using a DOM Document to hold the current state of the - * graph in XML form. This can be initially loaded and parsed from disk or - * a blank document used for an empty graph. As assertions are added to the - * graph, appropriate DOM nodes are added to the document to represent them - * along with any necessary whitespace to properly layout the XML. - * - * In general the order of adding assertions to the graph will impact the form - * the serialisation takes. If a resource is first added as the object of an - * assertion then it will eventually be serialised inside the assertion's - * property element. If a resource is first added as the subject of an assertion - * then it will be serialised at the top level of the XML. - */ - -const NS_XML = "http://www.w3.org/XML/1998/namespace"; -const NS_XMLNS = "http://www.w3.org/2000/xmlns/"; -const NS_RDF = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"; -const NS_NC = "http://home.netscape.com/NC-rdf#"; - -/* eslint prefer-template: 1 */ - -function raw(strings) { - return strings.raw[0].replace(/\s+/, ""); -} - -// Copied from http://www.w3.org/TR/2000/REC-xml-20001006#CharClasses -const XML_LETTER = raw` - \u0041-\u005A\u0061-\u007A\u00C0-\u00D6\u00D8-\u00F6 - \u00F8-\u00FF\u0100-\u0131\u0134-\u013E\u0141-\u0148 - \u014A-\u017E\u0180-\u01C3\u01CD-\u01F0\u01F4-\u01F5 - \u01FA-\u0217\u0250-\u02A8\u02BB-\u02C1\u0386\u0388-\u038A - \u038C\u038E-\u03A1\u03A3-\u03CE\u03D0-\u03D6\u03DA\u03DC - \u03DE\u03E0\u03E2-\u03F3\u0401-\u040C\u040E-\u044F - \u0451-\u045C\u045E-\u0481\u0490-\u04C4\u04C7-\u04C8 - \u04CB-\u04CC\u04D0-\u04EB\u04EE-\u04F5\u04F8-\u04F9 - \u0531-\u0556\u0559\u0561-\u0586\u05D0-\u05EA\u05F0-\u05F2 - \u0621-\u063A\u0641-\u064A\u0671-\u06B7\u06BA-\u06BE - \u06C0-\u06CE\u06D0-\u06D3\u06D5\u06E5-\u06E6\u0905-\u0939 - \u093D\u0958-\u0961\u0985-\u098C\u098F-\u0990\u0993-\u09A8 - \u09AA-\u09B0\u09B2\u09B6-\u09B9\u09DC-\u09DD\u09DF-\u09E1 - \u09F0-\u09F1\u0A05-\u0A0A\u0A0F-\u0A10\u0A13-\u0A28 - \u0A2A-\u0A30\u0A32-\u0A33\u0A35-\u0A36\u0A38-\u0A39 - \u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8B\u0A8D - \u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2-\u0AB3 - \u0AB5-\u0AB9\u0ABD\u0AE0\u0B05-\u0B0C\u0B0F-\u0B10 - \u0B13-\u0B28\u0B2A-\u0B30\u0B32-\u0B33\u0B36-\u0B39 - \u0B3D\u0B5C-\u0B5D\u0B5F-\u0B61\u0B85-\u0B8A\u0B8E-\u0B90 - \u0B92-\u0B95\u0B99-\u0B9A\u0B9C\u0B9E-\u0B9F\u0BA3-\u0BA4 - \u0BA8-\u0BAA\u0BAE-\u0BB5\u0BB7-\u0BB9\u0C05-\u0C0C - \u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39 - \u0C60-\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8 - \u0CAA-\u0CB3\u0CB5-\u0CB9\u0CDE\u0CE0-\u0CE1\u0D05-\u0D0C - \u0D0E-\u0D10\u0D12-\u0D28\u0D2A-\u0D39\u0D60-\u0D61 - \u0E01-\u0E2E\u0E30\u0E32-\u0E33\u0E40-\u0E45\u0E81-\u0E82 - \u0E84\u0E87-\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F - \u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA-\u0EAB\u0EAD-\u0EAE\u0EB0 - \u0EB2-\u0EB3\u0EBD\u0EC0-\u0EC4\u0F40-\u0F47\u0F49-\u0F69 - \u10A0-\u10C5\u10D0-\u10F6\u1100\u1102-\u1103\u1105-\u1107 - \u1109\u110B-\u110C\u110E-\u1112\u113C\u113E\u1140\u114C - \u114E\u1150\u1154-\u1155\u1159\u115F-\u1161\u1163\u1165 - \u1167\u1169\u116D-\u116E\u1172-\u1173\u1175\u119E\u11A8 - \u11AB\u11AE-\u11AF\u11B7-\u11B8\u11BA\u11BC-\u11C2\u11EB - \u11F0\u11F9\u1E00-\u1E9B\u1EA0-\u1EF9\u1F00-\u1F15 - \u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57 - \u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC - \u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB - \u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2126\u212A-\u212B - \u212E\u2180-\u2182\u3041-\u3094\u30A1-\u30FA\u3105-\u312C - \uAC00-\uD7A3\u4E00-\u9FA5\u3007\u3021-\u3029 -`; -const XML_DIGIT = raw` - \u0030-\u0039\u0660-\u0669\u06F0-\u06F9\u0966-\u096F - \u09E6-\u09EF\u0A66-\u0A6F\u0AE6-\u0AEF\u0B66-\u0B6F - \u0BE7-\u0BEF\u0C66-\u0C6F\u0CE6-\u0CEF\u0D66-\u0D6F - \u0E50-\u0E59\u0ED0-\u0ED9\u0F20-\u0F29 -`; -const XML_COMBINING = raw` - \u0300-\u0345\u0360-\u0361\u0483-\u0486\u0591-\u05A1 - \u05A3-\u05B9\u05BB-\u05BD\u05BF\u05C1-\u05C2\u05C4 - \u064B-\u0652\u0670\u06D6-\u06DC\u06DD-\u06DF\u06E0-\u06E4 - \u06E7-\u06E8\u06EA-\u06ED\u0901-\u0903\u093C\u093E-\u094C - \u094D\u0951-\u0954\u0962-\u0963\u0981-\u0983\u09BC\u09BE - \u09BF\u09C0-\u09C4\u09C7-\u09C8\u09CB-\u09CD\u09D7 - \u09E2-\u09E3\u0A02\u0A3C\u0A3E\u0A3F\u0A40-\u0A42 - \u0A47-\u0A48\u0A4B-\u0A4D\u0A70-\u0A71\u0A81-\u0A83 - \u0ABC\u0ABE-\u0AC5\u0AC7-\u0AC9\u0ACB-\u0ACD\u0B01-\u0B03 - \u0B3C\u0B3E-\u0B43\u0B47-\u0B48\u0B4B-\u0B4D\u0B56-\u0B57 - \u0B82-\u0B83\u0BBE-\u0BC2\u0BC6-\u0BC8\u0BCA-\u0BCD\u0BD7 - \u0C01-\u0C03\u0C3E-\u0C44\u0C46-\u0C48\u0C4A-\u0C4D - \u0C55-\u0C56\u0C82-\u0C83\u0CBE-\u0CC4\u0CC6-\u0CC8 - \u0CCA-\u0CCD\u0CD5-\u0CD6\u0D02-\u0D03\u0D3E-\u0D43 - \u0D46-\u0D48\u0D4A-\u0D4D\u0D57\u0E31\u0E34-\u0E3A - \u0E47-\u0E4E\u0EB1\u0EB4-\u0EB9\u0EBB-\u0EBC\u0EC8-\u0ECD - \u0F18-\u0F19\u0F35\u0F37\u0F39\u0F3E\u0F3F\u0F71-\u0F84 - \u0F86-\u0F8B\u0F90-\u0F95\u0F97\u0F99-\u0FAD\u0FB1-\u0FB7 - \u0FB9\u20D0-\u20DC\u20E1\u302A-\u302F\u3099\u309A -`; -const XML_EXTENDER = raw` - \u00B7\u02D0\u02D1\u0387\u0640\u0E46\u0EC6\u3005 - \u3031-\u3035\u309D-\u309E\u30FC-\u30FE -`; -const XML_NCNAMECHAR = String.raw`${XML_LETTER}${XML_DIGIT}\.\-_${XML_COMBINING}${XML_EXTENDER}`; -const XML_NCNAME = new RegExp(`^[${XML_LETTER}_][${XML_NCNAMECHAR}]*$`); - -const URI_SUFFIX = /[A-Za-z_][0-9A-Za-z\.\-_]*$/; -const INDENT = /\n([ \t]*)$/; -const RDF_LISTITEM = /^http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#_\d+$/; - -const RDF_NODE_INVALID_TYPES = - ["RDF", "ID", "about", "bagID", "parseType", "resource", "nodeID", - "li", "aboutEach", "aboutEachPrefix"]; -const RDF_PROPERTY_INVALID_TYPES = - ["Description", "RDF", "ID", "about", "bagID", "parseType", "resource", - "nodeID", "aboutEach", "aboutEachPrefix"]; - -/** - * Whether to use properly namespaces attributes for rdf:about etc... - * When on this produces poor output in the event that the rdf namespace is the - * default namespace, and the parser recognises unnamespaced attributes and - * most of our rdf examples are unnamespaced so leaving off for the time being. - */ -const USE_RDFNS_ATTR = false; - -var EXPORTED_SYMBOLS = ["RDFLiteral", "RDFIntLiteral", "RDFDateLiteral", - "RDFBlankNode", "RDFResource", "RDFDataSource"]; - -const {XPCOMUtils} = ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm"); - -XPCOMUtils.defineLazyGlobalGetters(this, ["DOMParser", "Element", "XMLSerializer", "fetch"]); - -const Services = globalThis.Services || ChromeUtils.import("resource://gre/modules/Services.jsm").Services; - -function isAttr(obj) { - return obj && typeof obj == "object" && ChromeUtils.getClassName(obj) == "Attr"; -} -function isDocument(obj) { - return obj && typeof obj == "object" && obj.nodeType == Element.DOCUMENT_NODE; -} -function isElement(obj) { - return Element.isInstance(obj); -} -function isText(obj) { - return obj && typeof obj == "object" && ChromeUtils.getClassName(obj) == "Text"; -} - -/** - * Logs an error message to the error console - */ -function ERROR(str) { - Cu.reportError(str); -} - -function RDF_R(name) { - return NS_RDF + name; -} - -function renameNode(domnode, namespaceURI, qname) { - if (isElement(domnode)) { - var newdomnode = domnode.ownerDocument.createElementNS(namespaceURI, qname); - if ("listCounter" in domnode) - newdomnode.listCounter = domnode.listCounter; - domnode.replaceWith(newdomnode); - while (domnode.firstChild) - newdomnode.appendChild(domnode.firstChild); - for (let attr of domnode.attributes) { - domnode.removeAttributeNode(attr); - newdomnode.setAttributeNode(attr); - } - return newdomnode; - } else if (isAttr(domnode)) { - if (domnode.ownerElement.hasAttribute(namespaceURI, qname)) - throw new Error("attribute already exists"); - var attr = domnode.ownerDocument.createAttributeNS(namespaceURI, qname); - attr.value = domnode.value; - domnode.ownerElement.setAttributeNode(attr); - domnode.ownerElement.removeAttributeNode(domnode); - return attr; - } - throw new Error("cannot rename node of this type"); -} - -function predicateOrder(a, b) { - return a.getPredicate().localeCompare(b.getPredicate()); -} - -/** - * Returns either an rdf namespaced attribute or an un-namespaced attribute - * value. Returns null if neither exists, - */ -function getRDFAttribute(element, name) { - if (element.hasAttributeNS(NS_RDF, name)) - return element.getAttributeNS(NS_RDF, name); - if (element.hasAttribute(name)) - return element.getAttribute(name); - return undefined; -} - -/** - * Represents an assertion in the datasource - */ -class RDFAssertion { - constructor(subject, predicate, object) { - if (!(subject instanceof RDFSubject)) - throw new Error("subject must be an RDFSubject"); - - if (typeof(predicate) != "string") - throw new Error("predicate must be a string URI"); - - if (!(object instanceof RDFLiteral) && !(object instanceof RDFSubject)) - throw new Error("object must be a concrete RDFNode"); - - if (object instanceof RDFSubject && object._ds != subject._ds) - throw new Error("object must be from the same datasource as subject"); - - // The subject on this assertion, an RDFSubject - this._subject = subject; - // The predicate, a string - this._predicate = predicate; - // The object, an RDFNode - this._object = object; - // The datasource this assertion exists in - this._ds = this._subject._ds; - // Marks that _DOMnode is the subject's element - this._isSubjectElement = false; - // The DOM node that represents this assertion. Could be a property element, - // a property attribute or the subject's element for rdf:type - this._DOMNode = null; - } - - /** - * Adds content to _DOMnode to store this assertion in the DOM document. - */ - _applyToDOMNode() { - if (this._object instanceof RDFLiteral) - this._object._applyToDOMNode(this._ds, this._DOMnode); - else - this._object._addReferenceToElement(this._DOMnode); - } - - /** - * Returns the DOM Element linked to the subject that this assertion is - * attached to. - */ - _getSubjectElement() { - if (isAttr(this._DOMnode)) - return this._DOMnode.ownerElement; - if (this._isSubjectElement) - return this._DOMnode; - return this._DOMnode.parentNode; - } - - getSubject() { - return this._subject; - } - - getPredicate() { - return this._predicate; - } - - getObject() { - return this._object; - } -} - -class RDFNode { - equals(rdfnode) { - return (rdfnode.constructor === this.constructor && - rdfnode._value == this._value); - } -} - -/** - * A simple literal value - */ -class RDFLiteral extends RDFNode { - constructor(value) { - super(); - this._value = value; - } - - /** - * This stores the value of the literal in the given DOM node - */ - _applyToDOMNode(ds, domnode) { - if (isElement(domnode)) - domnode.textContent = this._value; - else if (isAttr(domnode)) - domnode.value = this._value; - else - throw new Error("cannot use this node for a literal"); - } - - getValue() { - return this._value; - } -} - -/** - * A literal that is integer typed. - */ -class RDFIntLiteral extends RDFLiteral { - constructor(value) { - super(parseInt(value)); - } - - /** - * This stores the value of the literal in the given DOM node - */ - _applyToDOMNode(ds, domnode) { - if (!isElement(domnode)) - throw new Error("cannot use this node for a literal"); - - RDFLiteral.prototype._applyToDOMNode.call(this, ds, domnode); - var prefix = ds._resolvePrefix(domnode, `${NS_NC}parseType`); - domnode.setAttributeNS(prefix.namespaceURI, prefix.qname, "Integer"); - } -} - -/** - * A literal that represents a date. - */ -class RDFDateLiteral extends RDFLiteral { - constructor(value) { - if (!(value instanceof Date)) - throw new Error("RDFDateLiteral must be constructed with a Date object"); - - super(value); - } - - /** - * This stores the value of the literal in the given DOM node - */ - _applyToDOMNode(ds, domnode) { - if (!isElement(domnode)) - throw new Error("cannot use this node for a literal"); - - domnode.textContent = this._value.getTime(); - var prefix = ds._resolvePrefix(domnode, `${NS_NC}parseType`); - domnode.setAttributeNS(prefix.namespaceURI, prefix.qname, "Date"); - } -} - -/** - * This is an RDF node that can be a subject so a resource or a blank node - */ -class RDFSubject extends RDFNode { - constructor(ds) { - super(); - // A lookup of the assertions with this as the subject. Keyed on predicate - this._assertions = {}; - // A lookup of the assertions with this as the object. Keyed on predicate - this._backwards = {}; - // The datasource this subject belongs to - this._ds = ds; - // The DOM elements in the document that represent this subject. Array of Element - this._elements = []; - } - - /** - * Creates a new Element in the document for holding assertions about this - * subject. The URI controls what tagname to use. - */ - _createElement(uri) { - // Seek an appropriate reference to this node to add this node under - var parent = null; - for (var p in this._backwards) { - for (let back of this._backwards[p]) { - // Don't add under an rdf:type - if (back.getPredicate() == RDF_R("type")) - continue; - // The assertion already has a child node, probably one of ours - if (back._DOMnode.firstChild) - continue; - parent = back._DOMnode; - var element = this._ds._addElement(parent, uri); - this._removeReferenceFromElement(parent); - break; - } - if (parent) - break; - } - - // No back assertions that are sensible to use - if (!parent) - element = this._ds._addElement(this._ds._document.documentElement, uri); - - element.listCounter = 1; - this._applyToElement(element); - this._elements.push(element); - return element; - } - - /** - * When a DOM node representing this subject is removed from the document - * we must remove the node and recreate any child assertions elsewhere. - */ - _removeElement(element) { - var pos = this._elements.indexOf(element); - if (pos < 0) - throw new Error("invalid element"); - this._elements.splice(pos, 1); - if (element.parentNode != element.ownerDocument.documentElement) - this._addReferenceToElement(element.parentNode); - this._ds._removeElement(element); - - // Find all the assertions that are represented here and create new - // nodes for them. - for (var predicate in this._assertions) { - for (let assertion of this._assertions[predicate]) { - if (assertion._getSubjectElement() == element) - this._createDOMNodeForAssertion(assertion); - } - } - } - - /** - * Creates a DOM node to represent the assertion in the document. If the - * assertion has rdf:type as the predicate then an attempt will be made to - * create a typed subject Element, otherwise a new property Element is - * created. For list items an attempt is made to find an appropriate container - * that an rdf:li element can be added to. - */ - _createDOMNodeForAssertion(assertion) { - let elements; - if (RDF_LISTITEM.test(assertion.getPredicate())) { - // Find all the containers - elements = this._elements.filter(function(element) { - return (element.namespaceURI == NS_RDF && (element.localName == "Seq" || - element.localName == "Bag" || - element.localName == "Alt")); - }); - if (elements.length > 0) { - // Look for one whose listCounter matches the item we want to add - var item = parseInt(assertion.getPredicate().substring(NS_RDF.length + 1)); - for (let element of elements) { - if (element.listCounter == item) { - assertion._DOMnode = this._ds._addElement(element, RDF_R("li")); - assertion._applyToDOMNode(); - element.listCounter++; - return; - } - } - // No good container to add to, shove in the first real container - assertion._DOMnode = this._ds._addElement(elements[0], assertion.getPredicate()); - assertion._applyToDOMNode(); - return; - } - // TODO No containers, this will end up in a non-container for now - } else if (assertion.getPredicate() == RDF_R("type")) { - // Try renaming an existing rdf:Description - for (let element of this.elements) { - if (element.namespaceURI == NS_RDF && - element.localName == "Description") { - try { - var prefix = this._ds._resolvePrefix(element.parentNode, assertion.getObject().getURI()); - element = renameNode(element, prefix.namespaceURI, prefix.qname); - assertion._DOMnode = element; - assertion._isSubjectElement = true; - return; - } catch (e) { - // If the type cannot be sensibly turned into a prefix then just set - // as a regular property - } - } - } - } - - // Filter out all the containers - elements = this._elements.filter(function(element) { - return (element.namespaceURI != NS_RDF || (element.localName != "Seq" && - element.localName != "Bag" && - element.localName != "Alt")); - }); - if (elements.length == 0) { - // Create a new node of the right type - if (assertion.getPredicate() == RDF_R("type")) { - try { - assertion._DOMnode = this._createElement(assertion.getObject().getURI()); - assertion._isSubjectElement = true; - return; - } catch (e) { - // If the type cannot be sensibly turned into a prefix then just set - // as a regular property - } - } - elements[0] = this._createElement(RDF_R("Description")); - } - assertion._DOMnode = this._ds._addElement(elements[0], assertion.getPredicate()); - assertion._applyToDOMNode(); - } - - /** - * Removes the DOM node representing the assertion. - */ - _removeDOMNodeForAssertion(assertion) { - if (isAttr(assertion._DOMnode)) { - var parent = assertion._DOMnode.ownerElement; - parent.removeAttributeNode(assertion._DOMnode); - } else if (assertion._isSubjectElement) { - var domnode = renameNode(assertion._DOMnode, NS_RDF, "Description"); - if (domnode != assertion._DOMnode) { - var pos = this._elements.indexOf(assertion._DOMnode); - this._elements.splice(pos, 1, domnode); - } - parent = domnode; - } else { - var object = assertion.getObject(); - if (object instanceof RDFSubject && assertion._DOMnode.firstChild) { - // Object is a subject that has an Element inside this assertion's node. - for (let element of object._elements) { - if (element.parentNode == assertion._DOMnode) { - object._removeElement(element); - break; - } - } - } - parent = assertion._DOMnode.parentNode; - if (assertion._DOMnode.namespaceURI == NS_RDF && - assertion._DOMnode.localName == "li") - parent.listCounter--; - this._ds._removeElement(assertion._DOMnode); - } - - // If there are no assertions left using the assertion's containing dom node - // then remove it from the document. - // TODO could do with a quick lookup list for assertions attached to a node - for (var p in this._assertions) { - for (let assertion of this._assertions[p]) { - if (assertion._getSubjectElement() == parent) - return; - } - } - // No assertions left in this element. - this._removeElement(parent); - } - - /** - * Parses the given Element from the DOM document - */ - /* eslint-disable complexity */ - _parseElement(element) { - this._elements.push(element); - - // There might be an inferred rdf:type assertion in the element name - if (element.namespaceURI != NS_RDF || - element.localName != "Description") { - if (element.namespaceURI == NS_RDF && element.localName == "li") - throw new Error("rdf:li is not a valid type for a subject node"); - var assertion = new RDFAssertion(this, RDF_R("type"), - this._ds.getResource(element.namespaceURI + element.localName)); - assertion._DOMnode = element; - assertion._isSubjectElement = true; - this._addAssertion(assertion); - } - - // Certain attributes can be literal properties - for (let attr of element.attributes) { - if (attr.namespaceURI == NS_XML || attr.namespaceURI == NS_XMLNS || - attr.nodeName == "xmlns") - continue; - if ((attr.namespaceURI == NS_RDF || !attr.namespaceURI) && - (["nodeID", "about", "resource", "ID", "parseType"].includes(attr.localName))) - continue; - var object = null; - if (attr.namespaceURI == NS_RDF) { - if (attr.localName == "type") - object = this._ds.getResource(attr.nodeValue); - else if (attr.localName == "li") - throw new Error("rdf:li is not allowed as a property attribute"); - else if (attr.localName == "aboutEach") - throw new Error("rdf:aboutEach is deprecated"); - else if (attr.localName == "aboutEachPrefix") - throw new Error("rdf:aboutEachPrefix is deprecated"); - else if (attr.localName == "aboutEach") - throw new Error("rdf:aboutEach is deprecated"); - else if (attr.localName == "bagID") - throw new Error("rdf:bagID is deprecated"); - } - if (!object) - object = new RDFLiteral(attr.nodeValue); - assertion = new RDFAssertion(this, attr.namespaceURI + attr.localName, object); - assertion._DOMnode = attr; - this._addAssertion(assertion); - } - - var child = element.firstChild; - element.listCounter = 1; - while (child) { - if (isText(child) && /\S/.test(child.nodeValue)) { - ERROR(`Text ${child.nodeValue} is not allowed in a subject node`); - throw new Error("subject nodes cannot contain text content"); - } else if (isElement(child)) { - object = null; - var predicate = child.namespaceURI + child.localName; - if (child.namespaceURI == NS_RDF) { - if (RDF_PROPERTY_INVALID_TYPES.includes(child.localName) && - !child.localName.match(/^_\d+$/)) - throw new Error(`${child.nodeName} is an invalid property`); - if (child.localName == "li") { - predicate = RDF_R(`_${element.listCounter}`); - element.listCounter++; - } - } - - // Check for and bail out on unknown attributes on the property element - for (let attr of child.attributes) { - // Ignore XML namespaced attributes - if (attr.namespaceURI == NS_XML) - continue; - // These are reserved by XML for future use - if (attr.localName.substring(0, 3).toLowerCase() == "xml") - continue; - // We can handle these RDF attributes - if ((!attr.namespaceURI || attr.namespaceURI == NS_RDF) && - ["resource", "nodeID"].includes(attr.localName)) - continue; - // This is a special attribute we handle for compatibility with Mozilla RDF - if (attr.namespaceURI == NS_NC && - attr.localName == "parseType") - continue; - throw new Error(`Attribute ${attr.nodeName} is not supported`); - } - - var parseType = child.getAttributeNS(NS_NC, "parseType"); - if (parseType && parseType != "Date" && parseType != "Integer") { - ERROR(`parseType ${parseType} is not supported`); - throw new Error("unsupported parseType"); - } - - var resource = getRDFAttribute(child, "resource"); - var nodeID = getRDFAttribute(child, "nodeID"); - if ((resource && (nodeID || parseType)) || - (nodeID && (resource || parseType))) { - ERROR("Cannot use more than one of parseType, resource and nodeID on a single node"); - throw new Error("Invalid rdf assertion"); - } - - if (resource !== undefined) { - var base = Services.io.newURI(element.baseURI); - object = this._ds.getResource(base.resolve(resource)); - } else if (nodeID !== undefined) { - if (!nodeID.match(XML_NCNAME)) - throw new Error("rdf:nodeID must be a valid XML name"); - object = this._ds.getBlankNode(nodeID); - } else { - var hasText = false; - var childElement = null; - var subchild = child.firstChild; - while (subchild) { - if (isText(subchild) && /\S/.test(subchild.nodeValue)) { - hasText = true; - } else if (isElement(subchild)) { - if (childElement) { - new Error(`Multiple object elements found in ${child.nodeName}`); - } - childElement = subchild; - } - subchild = subchild.nextSibling; - } - - if ((resource || nodeID) && (hasText || childElement)) { - ERROR("Assertion references a resource so should not contain additional contents"); - throw new Error("assertion cannot contain multiple objects"); - } - - if (hasText && childElement) { - ERROR(`Both literal and resource objects found in ${child.nodeName}`); - throw new Error("assertion cannot contain multiple objects"); - } - - if (childElement) { - if (parseType) { - ERROR("Cannot specify a parseType for an assertion with resource object"); - throw new Error("parseType is not valid in this context"); - } - object = this._ds._getSubjectForElement(childElement); - object._parseElement(childElement); - } else if (parseType == "Integer") { - object = new RDFIntLiteral(child.textContent); - } else if (parseType == "Date") { - object = new RDFDateLiteral(new Date(child.textContent)); - } else { - object = new RDFLiteral(child.textContent); - } - } - - assertion = new RDFAssertion(this, predicate, object); - this._addAssertion(assertion); - assertion._DOMnode = child; - } - child = child.nextSibling; - } - } - /* eslint-enable complexity */ - - /** - * Adds a new assertion to the internal hashes. Should be called for every - * new assertion parsed or created programmatically. - */ - _addAssertion(assertion) { - var predicate = assertion.getPredicate(); - if (predicate in this._assertions) - this._assertions[predicate].push(assertion); - else - this._assertions[predicate] = [ assertion ]; - - var object = assertion.getObject(); - if (object instanceof RDFSubject) { - // Create reverse assertion - if (predicate in object._backwards) - object._backwards[predicate].push(assertion); - else - object._backwards[predicate] = [ assertion ]; - } - } - - /** - * Removes an assertion from the internal hashes. Should be called for all - * assertions that are programmatically deleted. - */ - _removeAssertion(assertion) { - var predicate = assertion.getPredicate(); - if (predicate in this._assertions) { - var pos = this._assertions[predicate].indexOf(assertion); - if (pos >= 0) - this._assertions[predicate].splice(pos, 1); - if (this._assertions[predicate].length == 0) - delete this._assertions[predicate]; - } - - var object = assertion.getObject(); - if (object instanceof RDFSubject) { - // Delete reverse assertion - if (predicate in object._backwards) { - pos = object._backwards[predicate].indexOf(assertion); - if (pos >= 0) - object._backwards[predicate].splice(pos, 1); - if (object._backwards[predicate].length == 0) - delete object._backwards[predicate]; - } - } - } - - /** - * Returns the ordinal assertions from this subject in order. - */ - _getChildAssertions() { - var assertions = []; - for (var i in this._assertions) { - if (RDF_LISTITEM.test(i)) - assertions.push(...this._assertions[i]); - } - assertions.sort(predicateOrder); - return assertions; - } - - /** - * Compares this to another rdf node - */ - equals(rdfnode) { - // subjects are created by the datasource so no two objects ever correspond - // to the same one. - return this === rdfnode; - } - - /** - * Adds a new assertion with this as the subject - */ - assert(predicate, object) { - if (predicate == RDF_R("type") && !(object instanceof RDFResource)) - throw new Error("rdf:type must be an RDFResource"); - - var assertion = new RDFAssertion(this, predicate, object); - this._createDOMNodeForAssertion(assertion); - this._addAssertion(assertion); - } - - /** - * Removes an assertion matching the predicate and node given, if such an - * assertion exists. - */ - unassert(predicate, object) { - if (!(predicate in this._assertions)) - return; - - for (let assertion of this._assertions[predicate]) { - if (assertion.getObject().equals(object)) { - this._removeAssertion(assertion); - this._removeDOMNodeForAssertion(assertion); - return; - } - } - } - - /** - * Returns an array of all the predicates that exist in assertions from this - * subject. - */ - getPredicates() { - return Object.keys(this._assertions); - } - - /** - * Returns all objects in assertions with this subject and the given predicate. - */ - getObjects(predicate) { - if (predicate in this._assertions) - return Array.from(this._assertions[predicate], - i => i.getObject()); - - return []; - } - - /** - * Returns all of the ordinal children of this subject in order. - */ - getChildren() { - return Array.from(this._getChildAssertions(), - i => i.getObject()); - } - - /** - * Removes the child at the given index. This is the index based on the - * children returned from getChildren. Forces a reordering of the later - * children. - */ - removeChildAt(pos) { - if (pos < 0) - throw new Error("no such child"); - var assertions = this._getChildAssertions(); - if (pos >= assertions.length) - throw new Error("no such child"); - for (var i = pos; i < assertions.length; i++) { - this._removeAssertion(assertions[i]); - this._removeDOMNodeForAssertion(assertions[i]); - } - var index = 1; - if (pos > 0) - index = parseInt(assertions[pos - 1].getPredicate().substring(NS_RDF.length + 1)) + 1; - for (let i = pos + 1; i < assertions.length; i++) { - assertions[i]._predicate = RDF_R(`_${index}`); - this._addAssertion(assertions[i]); - this._createDOMNodeForAssertion(assertions[i]); - index++; - } - } - - /** - * Removes the child with the given object. It is unspecified which child is - * removed if the object features more than once. - */ - removeChild(object) { - var assertions = this._getChildAssertions(); - for (var pos = 0; pos < assertions.length; pos++) { - if (assertions[pos].getObject().equals(object)) { - for (var i = pos; i < assertions.length; i++) { - this._removeAssertion(assertions[i]); - this._removeDOMNodeForAssertion(assertions[i]); - } - var index = 1; - if (pos > 0) - index = parseInt(assertions[pos - 1].getPredicate().substring(NS_RDF.length + 1)) + 1; - for (let i = pos + 1; i < assertions.length; i++) { - assertions[i]._predicate = RDF_R(`_${index}`); - this._addAssertion(assertions[i]); - this._createDOMNodeForAssertion(assertions[i]); - index++; - } - return; - } - } - throw new Error("no such child"); - } - - /** - * Adds a new ordinal child to this subject. - */ - addChild(object) { - var max = 0; - for (var i in this._assertions) { - if (RDF_LISTITEM.test(i)) - max = Math.max(max, parseInt(i.substring(NS_RDF.length + 1))); - } - max++; - this.assert(RDF_R(`_${max}`), object); - } - - /** - * This reorders the child assertions to remove duplicates and gaps in the - * sequence. Generally this will move all children to be under the same - * container element and all represented as an rdf:li - */ - reorderChildren() { - var assertions = this._getChildAssertions(); - for (let assertion of assertions) { - this._removeAssertion(assertion); - this._removeDOMNodeForAssertion(assertion); - } - var index = 1; - for (let assertion of assertions) { - assertion._predicate = RDF_R(`_${index}`); - this._addAssertion(assertion); - this._createDOMNodeForAssertion(assertion); - index++; - } - } - - /** - * Returns the type of this subject or null if there is no specified type. - */ - getType() { - var type = this.getProperty(RDF_R("type")); - if (type && type instanceof RDFResource) - return type.getURI(); - return null; - } - - /** - * Tests if a property exists for the given predicate. - */ - hasProperty(predicate) { - return (predicate in this._assertions); - } - - /** - * Retrieves the first property value for the given predicate. - */ - getProperty(predicate) { - if (predicate in this._assertions) - return this._assertions[predicate][0].getObject(); - return null; - } - - /** - * Sets the property value for the given predicate, clearing any existing - * values. - */ - setProperty(predicate, object) { - // TODO optimise by replacing the first assertion and clearing the rest - this.clearProperty(predicate); - this.assert(predicate, object); - } - - /** - * Clears any existing properties for the given predicate. - */ - clearProperty(predicate) { - if (!(predicate in this._assertions)) - return; - - var assertions = this._assertions[predicate]; - while (assertions.length > 0) { - var assertion = assertions[0]; - this._removeAssertion(assertion); - this._removeDOMNodeForAssertion(assertion); - } - } -} - -/** - * Creates a new RDFResource for the datasource. Private. - */ -class RDFResource extends RDFSubject { - constructor(ds, uri) { - if (!(ds instanceof RDFDataSource)) - throw new Error("datasource must be an RDFDataSource"); - - if (!uri) - throw new Error("An RDFResource requires a non-null uri"); - - super(ds); - // This is the uri that the resource represents. - this._uri = uri; - } - - /** - * Sets attributes on the DOM element to mark it as representing this resource - */ - _applyToElement(element) { - if (USE_RDFNS_ATTR) { - var prefix = this._ds._resolvePrefix(element, RDF_R("about")); - element.setAttributeNS(prefix.namespaceURI, prefix.qname, this._uri); - } else { - element.setAttribute("about", this._uri); - } - } - - /** - * Adds a reference to this resource to the given property Element. - */ - _addReferenceToElement(element) { - if (USE_RDFNS_ATTR) { - var prefix = this._ds._resolvePrefix(element, RDF_R("resource")); - element.setAttributeNS(prefix.namespaceURI, prefix.qname, this._uri); - } else { - element.setAttribute("resource", this._uri); - } - } - - /** - * Removes any reference to this resource from the given property Element. - */ - _removeReferenceFromElement(element) { - if (element.hasAttributeNS(NS_RDF, "resource")) - element.removeAttributeNS(NS_RDF, "resource"); - if (element.hasAttribute("resource")) - element.removeAttribute("resource"); - } - - getURI() { - return this._uri; - } -} - -/** - * Creates a new blank node. Private. - */ -class RDFBlankNode extends RDFSubject { - constructor(ds, nodeID) { - if (!(ds instanceof RDFDataSource)) - throw new Error("datasource must be an RDFDataSource"); - - super(ds); - // The nodeID of this node. May be null if there is no ID. - this._nodeID = nodeID; - } - - /** - * Sets attributes on the DOM element to mark it as representing this node - */ - _applyToElement(element) { - if (!this._nodeID) - return; - if (USE_RDFNS_ATTR) { - var prefix = this._ds._resolvePrefix(element, RDF_R("nodeID")); - element.setAttributeNS(prefix.namespaceURI, prefix.qname, this._nodeID); - } else { - element.setAttribute("nodeID", this._nodeID); - } - } - - /** - * Creates a new Element in the document for holding assertions about this - * subject. The URI controls what tagname to use. - */ - _createNewElement(uri) { - // If there are already nodes representing this in the document then we need - // a nodeID to match them - if (!this._nodeID && this._elements.length > 0) { - this._ds._createNodeID(this); - for (let element of this._elements) - this._applyToElement(element); - } - - return super._createNewElement.call(uri); - } - - /** - * Adds a reference to this node to the given property Element. - */ - _addReferenceToElement(element) { - if (this._elements.length > 0 && !this._nodeID) { - // In document elsewhere already - // Create a node ID and update the other nodes referencing - this._ds._createNodeID(this); - for (let element of this._elements) - this._applyToElement(element); - } - - if (this._nodeID) { - if (USE_RDFNS_ATTR) { - let prefix = this._ds._resolvePrefix(element, RDF_R("nodeID")); - element.setAttributeNS(prefix.namespaceURI, prefix.qname, this._nodeID); - } else { - element.setAttribute("nodeID", this._nodeID); - } - } else { - // Add the empty blank node, this is generally right since further - // assertions will be added to fill this out - var newelement = this._ds._addElement(element, RDF_R("Description")); - newelement.listCounter = 1; - this._elements.push(newelement); - } - } - - /** - * Removes any reference to this node from the given property Element. - */ - _removeReferenceFromElement(element) { - if (element.hasAttributeNS(NS_RDF, "nodeID")) - element.removeAttributeNS(NS_RDF, "nodeID"); - if (element.hasAttribute("nodeID")) - element.removeAttribute("nodeID"); - } - - getNodeID() { - return this._nodeID; - } -} - -/** - * Creates a new RDFDataSource from the given document. The document will be - * changed as assertions are added and removed to the RDF. Pass a null document - * to start with an empty graph. - */ -class RDFDataSource { - constructor(document) { - // All known resources, indexed on URI - this._resources = {}; - // All blank nodes - this._allBlankNodes = []; - // All blank nodes with IDs, indexed on ID - this._blankNodes = {}; - // Suggested prefixes to use for namespaces, index is prefix, value is namespaceURI. - this._prefixes = { - rdf: NS_RDF, - NC: NS_NC, - }; - - if (!document) { - // Creating a document through xpcom leaves out the xml prolog so just parse - // something small - var parser = Cc["@mozilla.org/xmlextras/domparser;1"]. - createInstance(Ci.nsIDOMParser); - var doctext = `<?xml version="1.0"?>\n<rdf:RDF xmlns:rdf="${NS_RDF}"/>\n`; - document = parser.parseFromString(doctext, "text/xml"); - } - // The underlying DOM document for this datasource - this._document = document; - this._parseDocument(); - } - - static loadFromString(text) { - let parser = new DOMParser(); - let document = parser.parseFromString(text, "application/xml"); - - return new this(document); - } - - static loadFromBuffer(buffer) { - let parser = new DOMParser(); - let document = parser.parseFromBuffer(new Uint8Array(buffer), "application/xml"); - - return new this(document); - } - - static async loadFromFile(uri) { - if (uri instanceof Ci.nsIFile) - uri = Services.io.newFileURI(uri); - else if (typeof(uri) == "string") - uri = Services.io.newURI(uri); - - let resp = await fetch(uri.spec); - return this.loadFromBuffer(await resp.arrayBuffer()); - } - - get uri() { - return this._document.documentURI; - } - - /** - * Creates a new nodeID for an unnamed blank node. Just node<number>. - */ - _createNodeID(blanknode) { - var i = 1; - while (`node${i}` in this._blankNodes) - i++; - blanknode._nodeID = `node${i}`; - this._blankNodes[blanknode._nodeID] = blanknode; - } - - /** - * Returns an rdf subject for the given DOM Element. If the subject has not - * been seen before a new one is created. - */ - _getSubjectForElement(element) { - if (element.namespaceURI == NS_RDF && - RDF_NODE_INVALID_TYPES.includes(element.localName)) - throw new Error(`${element.nodeName} is not a valid class for a subject node`); - - var about = getRDFAttribute(element, "about"); - var id = getRDFAttribute(element, "ID"); - var nodeID = getRDFAttribute(element, "nodeID"); - - if ((about && (id || nodeID)) || - (nodeID && (id || about))) { - ERROR("More than one of about, ID and nodeID present on the same subject"); - throw new Error("invalid subject in rdf"); - } - - if (about !== undefined) { - let base = Services.io.newURI(element.baseURI); - return this.getResource(base.resolve(about)); - } - if (id !== undefined) { - if (!id.match(XML_NCNAME)) - throw new Error("rdf:ID must be a valid XML name"); - let base = Services.io.newURI(element.baseURI); - return this.getResource(base.resolve(`#${id}`)); - } - if (nodeID !== undefined) - return this.getBlankNode(nodeID); - return this.getBlankNode(null); - } - - /** - * Parses the document for subjects at the top level. - */ - _parseDocument() { - if (!this._document.documentElement) { - ERROR("No document element in document"); - throw new Error("document contains no root element"); - } - - if (this._document.documentElement.namespaceURI != NS_RDF || - this._document.documentElement.localName != "RDF") { - ERROR(`${this._document.documentElement.nodeName} is not rdf:RDF`); - throw new Error("document does not appear to be RDF"); - } - - var domnode = this._document.documentElement.firstChild; - while (domnode) { - if (isText(domnode) && /\S/.test(domnode.nodeValue)) { - ERROR("RDF does not allow for text in the root of the document"); - throw new Error("invalid markup in document"); - } else if (isElement(domnode)) { - var subject = this._getSubjectForElement(domnode); - subject._parseElement(domnode); - } - domnode = domnode.nextSibling; - } - } - - /** - * Works out a sensible namespace prefix to use for the given uri. node should - * be the parent of where the element is to be inserted, or the node that an - * attribute is to be added to. This will recursively walk to the top of the - * document finding an already registered prefix that matches for the uri. - * If none is found a new prefix is registered. - * This returns an object with keys namespaceURI, prefix, localName and qname. - * Pass null or undefined for badPrefixes for the first call. - */ - _resolvePrefix(domnode, uri, badPrefixes) { - if (!badPrefixes) - badPrefixes = []; - - // No known prefix, try to create one from the lookup list - if (!domnode || isDocument(domnode)) { - for (let i in this._prefixes) { - if (badPrefixes.includes(i)) - continue; - if (this._prefixes[i] == uri.substring(0, this._prefixes[i].length)) { - var local = uri.substring(this._prefixes[i].length); - var test = URI_SUFFIX.exec(local); - // Remaining part of uri is a good XML Name - if (test && test[0] == local) { - this._document.documentElement.setAttributeNS(NS_XMLNS, `xmlns:${i}`, this._prefixes[i]); - return { - namespaceURI: this._prefixes[i], - prefix: i, - localName: local, - qname: i ? `${i}:${local}` : local, - }; - } - } - } - - // No match, make something up - test = URI_SUFFIX.exec(uri); - if (test) { - var namespaceURI = uri.substring(0, uri.length - test[0].length); - local = test[0]; - let i = 1; - while (badPrefixes.includes(`NS${i}`)) - i++; - this._document.documentElement.setAttributeNS(NS_XMLNS, `xmlns:NS${i}`, namespaceURI); - return { - namespaceURI, - prefix: `NS${i}`, - localName: local, - qname: `NS${i}:${local}`, - }; - } - // There is no end part of this URI that is an XML Name - throw new Error(`invalid node name: ${uri}`); - } - - for (let attr of domnode.attributes) { - // Not a namespace declaration, ignore this attribute - if (attr.namespaceURI != NS_XMLNS && attr.nodeName != "xmlns") - continue; - - var prefix = attr.prefix ? attr.localName : ""; - // Seen this prefix before, cannot use it - if (badPrefixes.includes(prefix)) - continue; - - // Namespace matches the start of the uri - if (attr.value == uri.substring(0, attr.value.length)) { - local = uri.substring(attr.value.length); - test = URI_SUFFIX.exec(local); - // Remaining part of uri is a good XML Name - if (test && test[0] == local) { - return { - namespaceURI: attr.value, - prefix, - localName: local, - qname: prefix ? `${prefix}:${local}` : local, - }; - } - } - - badPrefixes.push(prefix); - } - - // No prefix found here, move up the document - return this._resolvePrefix(domnode.parentNode, uri, badPrefixes); - } - - /** - * Guess the indent level within the given Element. The method looks for - * elements that are preceded by whitespace including a newline. The - * whitespace following the newline is presumed to be the indentation for the - * element. - * If the indentation cannot be guessed then it recurses up the document - * hierarchy until it can guess the indent or until the Document is reached. - */ - _guessIndent(element) { - // The indent at document level is 0 - if (!element || isDocument(element)) - return ""; - - // Check the text immediately preceding each child node. One could be - // a valid indent - var pretext = ""; - var child = element.firstChild; - while (child) { - if (isText(child)) { - pretext += child.nodeValue; - } else if (isElement(child)) { - var result = INDENT.exec(pretext); - if (result) - return result[1]; - pretext = ""; - } - child = child.nextSibling; - } - - // pretext now contains any trailing text in the element. This can be - // the indent of the end tag. If so add a little to it. - result = INDENT.exec(pretext); - if (result) - return `${result[1]} `; - - // Check the text immediately before this node - pretext = ""; - var sibling = element.previousSibling; - while (sibling && isText(sibling)) { - pretext += sibling.nodeValue; - sibling = sibling.previousSibling; - } - - // If there is a sensible indent then just add to it. - result = INDENT.exec(pretext); - if (result) - return `${result[1]} `; - - // Last chance, get the indent level for the tag above and add to it - return `${this._guessIndent(element.parentNode)} `; - } - - _addElement(parent, uri) { - var prefix = this._resolvePrefix(parent, uri); - var element = this._document.createElementNS(prefix.namespaceURI, prefix.qname); - - if (parent.lastChild) { - // We want to insert immediately after the last child element - var last = parent.lastChild; - while (last && isText(last)) - last = last.previousSibling; - // No child elements so insert at the start - if (!last) - last = parent.firstChild; - else - last = last.nextSibling; - - let indent = this._guessIndent(parent); - parent.insertBefore(this._document.createTextNode(`\n${indent}`), last); - parent.insertBefore(element, last); - } else { - // No children, must indent our element and the end tag - let indent = this._guessIndent(parent.parentNode); - parent.append(`\n${indent} `, element, `\n${indent}`); - } - return element; - } - - /** - * Removes the element from its parent. Should also remove surrounding - * white space as appropriate. - */ - _removeElement(element) { - var parent = element.parentNode; - var sibling = element.previousSibling; - // Drop any text nodes immediately preceding the element - while (sibling && isText(sibling)) { - var temp = sibling; - sibling = sibling.previousSibling; - parent.removeChild(temp); - } - - sibling = element.nextSibling; - // Drop the element - parent.removeChild(element); - - // If the next node after element is now the first child then element was - // the first child. If there are no other child elements then remove the - // remaining child nodes. - if (parent.firstChild == sibling) { - while (sibling && isText(sibling)) - sibling = sibling.nextSibling; - if (!sibling) { - // No other child elements - while (parent.lastChild) - parent.removeChild(parent.lastChild); - } - } - } - - /** - * Requests that a given prefix be used for the namespace where possible. - * This must be called before any assertions are made using the namespace - * and the registration will not override any existing prefix used in the - * document. - */ - registerPrefix(prefix, namespaceURI) { - this._prefixes[prefix] = namespaceURI; - } - - /** - * Gets a blank node. nodeID may be null and if so a new blank node is created. - * If a nodeID is given then the blank node with that ID is returned or created. - */ - getBlankNode(nodeID) { - if (nodeID && nodeID in this._blankNodes) - return this._blankNodes[nodeID]; - - if (nodeID && !nodeID.match(XML_NCNAME)) - throw new Error("rdf:nodeID must be a valid XML name"); - - var rdfnode = new RDFBlankNode(this, nodeID); - this._allBlankNodes.push(rdfnode); - if (nodeID) - this._blankNodes[nodeID] = rdfnode; - return rdfnode; - } - - /** - * Gets all blank nodes - */ - getAllBlankNodes() { - return this._allBlankNodes.slice(); - } - - /** - * Gets the resource for the URI. The resource is created if it has not been - * used already. - */ - getResource(uri) { - if (uri in this._resources) - return this._resources[uri]; - - var resource = new RDFResource(this, uri); - this._resources[uri] = resource; - return resource; - } - - /** - * Gets all resources that have been used. - */ - getAllResources() { - return Object.values(this._resources); - } - - /** - * Returns all blank nodes and resources - */ - getAllSubjects() { - return [...Object.values(this._resources), - ...this._allBlankNodes]; - } - - /** - * Saves the RDF/XML to a string. - */ - serializeToString() { - var serializer = new XMLSerializer(); - return serializer.serializeToString(this._document); - } - - /** - * Saves the RDF/XML to a file. - */ - async saveToFile(file) { - return IOUtils.writeUTF8(file, this.serializeToString()); - } -} |