/// <summary>Expands a language map.</summary> /// <remarks>Expands a language map.</remarks> /// <param name="languageMap">the language map to expand.</param> /// <returns>the expanded language map.</returns> /// <exception cref="JsonLdError">JsonLdError</exception> /// <exception cref="JsonLD.Core.JsonLdError"></exception> internal static JArray ExpandLanguageMap(JObject languageMap ) { JArray rval = new JArray(); IList<string> keys = new List<string>(languageMap.GetKeys()); keys.SortInPlace(); // lexicographically sort languages foreach (string key in keys) { JToken val; if (!IsArray(languageMap[key])) { val = new JArray(); ((JArray)val).Add(languageMap[key]); } else { val = (JArray)languageMap[key]; } foreach (JToken item in val) { if (!IsString(item)) { throw new JsonLdError(JsonLdError.Error.SyntaxError); } JObject tmp = new JObject(); tmp["@value"] = item; tmp["@language"] = key.ToLower(); rval.Add(tmp); } } return rval; }
/// <exception cref="JsonLD.Core.JsonLdError"></exception> private static void Resolve(JToken input, JObject cycles) { Pattern regex = Pattern.Compile("(http|https)://(\\w+:{0,1}\\w*@)?(\\S+)(:[0-9]+)?(/|/([\\w#!:.?+=&%@!\\-/]))?" ); if (cycles.Count > MaxContextUrls) { throw new JsonLdError(JsonLdError.Error.UnknownError); } // for tracking the URLs to resolve JObject urls = new JObject(); // find all URLs in the given input if (!FindContextUrls(input, urls, false)) { // finished FindContextUrls(input, urls, true); } // queue all unresolved URLs JArray queue = new JArray(); foreach (string url in urls.GetKeys()) { if (urls[url].SafeCompare(false)) { // validate URL if (!regex.Matcher(url).Matches()) { throw new JsonLdError(JsonLdError.Error.UnknownError); } queue.Add(url); } } // resolve URLs in queue int count = queue.Count; foreach (string url_1 in queue) { // check for context URL cycle if (cycles.ContainsKey(url_1)) { throw new JsonLdError(JsonLdError.Error.UnknownError); } JObject _cycles = (JObject)Clone(cycles); _cycles[url_1] = true; try { JObject ctx = (JObject)new DocumentLoader().LoadDocument(url_1).Document; if (!ctx.ContainsKey("@context")) { ctx = new JObject(); ctx["@context"] = new JObject(); } Resolve(ctx, _cycles); urls[url_1] = ctx["@context"]; count -= 1; if (count == 0) { FindContextUrls(input, urls, true); } } //catch (JsonParseException) //{ // throw new JsonLdError(JsonLdError.Error.UnknownError); //} //catch (MalformedURLException) //{ // throw new JsonLdError(JsonLdError.Error.UnknownError); //} catch (IOException) { throw new JsonLdError(JsonLdError.Error.UnknownError); } } }
/// <summary> /// Expansion Algorithm /// http://json-ld.org/spec/latest/json-ld-api/#expansion-algorithm /// </summary> /// <param name="activeCtx"></param> /// <param name="activeProperty"></param> /// <param name="element"></param> /// <returns></returns> /// <exception cref="JsonLdError">JsonLdError</exception> /// <exception cref="JsonLD.Core.JsonLdError"></exception> public virtual JToken Expand(Context activeCtx, string activeProperty, JToken element ) { // 1) if (element.IsNull()) { return null; } // 3) if (element is JArray) { // 3.1) JArray result = new JArray(); // 3.2) foreach (JToken item in (JArray)element) { // 3.2.1) JToken v = Expand(activeCtx, activeProperty, item); // 3.2.2) if (("@list".Equals(activeProperty) || "@list".Equals(activeCtx.GetContainer(activeProperty ))) && (v is JArray || (v is JObject && ((IDictionary<string, JToken>)v).ContainsKey ("@list")))) { throw new JsonLdError(JsonLdError.Error.ListOfLists, "lists of lists are not permitted." ); } else { // 3.2.3) if (!v.IsNull()) { if (v is JArray) { JsonLD.Collections.AddAll(result, (JArray)v); } else { result.Add(v); } } } } // 3.3) return result; } else { // 4) if (element is JObject) { // access helper IDictionary<string, JToken> elem = (JObject)element; // 5) if (elem.ContainsKey("@context")) { activeCtx = activeCtx.Parse(elem["@context"]); } // 6) JObject result = new JObject(); // 7) JArray keys = new JArray(element.GetKeys()); keys.SortInPlace(); foreach (string key in keys) { JToken value = elem[key]; // 7.1) if (key.Equals("@context")) { continue; } // 7.2) string expandedProperty = activeCtx.ExpandIri(key, false, true, null, null); JToken expandedValue = null; // 7.3) if (expandedProperty == null || (!expandedProperty.Contains(":") && !JsonLdUtils.IsKeyword (expandedProperty))) { continue; } // 7.4) if (JsonLdUtils.IsKeyword(expandedProperty)) { // 7.4.1) if ("@reverse".Equals(activeProperty)) { throw new JsonLdError(JsonLdError.Error.InvalidReversePropertyMap, "a keyword cannot be used as a @reverse propery" ); } // 7.4.2) if (result.ContainsKey(expandedProperty)) { throw new JsonLdError(JsonLdError.Error.CollidingKeywords, expandedProperty + " already exists in result" ); } // 7.4.3) if ("@id".Equals(expandedProperty)) { if (!(value.Type == JTokenType.String)) { throw new JsonLdError(JsonLdError.Error.InvalidIdValue, "value of @id must be a string" ); } expandedValue = activeCtx.ExpandIri((string)value, true, false, null, null); } else { // 7.4.4) if ("@type".Equals(expandedProperty)) { if (value is JArray) { expandedValue = new JArray(); foreach (JToken v in (JArray)value) { if (v.Type != JTokenType.String) { throw new JsonLdError(JsonLdError.Error.InvalidTypeValue, "@type value must be a string or array of strings" ); } ((JArray)expandedValue).Add(activeCtx.ExpandIri((string)v, true, true, null , null)); } } else { if (value.Type == JTokenType.String) { expandedValue = activeCtx.ExpandIri((string)value, true, true, null, null); } else { // TODO: SPEC: no mention of empty map check if (value is JObject) { if (((JObject)value).Count != 0) { throw new JsonLdError(JsonLdError.Error.InvalidTypeValue, "@type value must be a an empty object for framing" ); } expandedValue = value; } else { throw new JsonLdError(JsonLdError.Error.InvalidTypeValue, "@type value must be a string or array of strings" ); } } } } else { // 7.4.5) if ("@graph".Equals(expandedProperty)) { expandedValue = Expand(activeCtx, "@graph", value); } else { // 7.4.6) if ("@value".Equals(expandedProperty)) { if (!value.IsNull() && (value is JObject || value is JArray)) { throw new JsonLdError(JsonLdError.Error.InvalidValueObjectValue, "value of " + expandedProperty + " must be a scalar or null"); } expandedValue = value; if (expandedValue.IsNull()) { result["@value"] = null; continue; } } else { // 7.4.7) if ("@language".Equals(expandedProperty)) { if (!(value.Type == JTokenType.String)) { throw new JsonLdError(JsonLdError.Error.InvalidLanguageTaggedString, "Value of " + expandedProperty + " must be a string"); } expandedValue = ((string)value).ToLower(); } else { // 7.4.8) if ("@index".Equals(expandedProperty)) { if (!(value.Type == JTokenType.String)) { throw new JsonLdError(JsonLdError.Error.InvalidIndexValue, "Value of " + expandedProperty + " must be a string"); } expandedValue = value; } else { // 7.4.9) if ("@list".Equals(expandedProperty)) { // 7.4.9.1) if (activeProperty == null || "@graph".Equals(activeProperty)) { continue; } // 7.4.9.2) expandedValue = Expand(activeCtx, activeProperty, value); // NOTE: step not in the spec yet if (!(expandedValue is JArray)) { JArray tmp = new JArray(); tmp.Add(expandedValue); expandedValue = tmp; } // 7.4.9.3) foreach (JToken o in (JArray)expandedValue) { if (o is JObject && ((JObject)o).ContainsKey("@list")) { throw new JsonLdError(JsonLdError.Error.ListOfLists, "A list may not contain another list" ); } } } else { // 7.4.10) if ("@set".Equals(expandedProperty)) { expandedValue = Expand(activeCtx, activeProperty, value); } else { // 7.4.11) if ("@reverse".Equals(expandedProperty)) { if (!(value is JObject)) { throw new JsonLdError(JsonLdError.Error.InvalidReverseValue, "@reverse value must be an object" ); } // 7.4.11.1) expandedValue = Expand(activeCtx, "@reverse", value); // NOTE: algorithm assumes the result is a map // 7.4.11.2) if (((IDictionary<string, JToken>)expandedValue).ContainsKey("@reverse")) { JObject reverse = (JObject)((JObject)expandedValue)["@reverse"]; foreach (string property in reverse.GetKeys()) { JToken item = reverse[property]; // 7.4.11.2.1) if (!result.ContainsKey(property)) { result[property] = new JArray(); } // 7.4.11.2.2) if (item is JArray) { JsonLD.Collections.AddAll(((JArray)result[property]), (JArray)item); } else { ((JArray)result[property]).Add(item); } } } // 7.4.11.3) if (((JObject)expandedValue).Count > (((JObject)expandedValue).ContainsKey("@reverse") ? 1 : 0)) { // 7.4.11.3.1) if (!result.ContainsKey("@reverse")) { result["@reverse"] = new JObject(); } // 7.4.11.3.2) JObject reverseMap = (JObject)result["@reverse"]; // 7.4.11.3.3) foreach (string property in expandedValue.GetKeys()) { if ("@reverse".Equals(property)) { continue; } // 7.4.11.3.3.1) JArray items = (JArray)((JObject)expandedValue)[property]; foreach (JToken item in items) { // 7.4.11.3.3.1.1) if (item is JObject && (((JObject)item).ContainsKey("@value") || ((JObject)item).ContainsKey("@list"))) { throw new JsonLdError(JsonLdError.Error.InvalidReversePropertyValue); } // 7.4.11.3.3.1.2) if (!reverseMap.ContainsKey(property)) { reverseMap[property] = new JArray(); } // 7.4.11.3.3.1.3) ((JArray)reverseMap[property]).Add(item); } } } // 7.4.11.4) continue; } else { // TODO: SPEC no mention of @explicit etc in spec if ("@explicit".Equals(expandedProperty) || "@default".Equals(expandedProperty) || "@embed".Equals(expandedProperty) || "@embedChildren".Equals(expandedProperty) || "@omitDefault".Equals(expandedProperty)) { expandedValue = Expand(activeCtx, expandedProperty, value); } } } } } } } } } } // 7.4.12) if (!expandedValue.IsNull()) { result[expandedProperty] = expandedValue; } // 7.4.13) continue; } else { // 7.5 if ("@language".Equals(activeCtx.GetContainer(key)) && value is JObject) { // 7.5.1) expandedValue = new JArray(); // 7.5.2) foreach (string language in value.GetKeys()) { JToken languageValue = ((IDictionary<string, JToken>)value)[language]; // 7.5.2.1) if (!(languageValue is JArray)) { JToken tmp = languageValue; languageValue = new JArray(); ((JArray)languageValue).Add(tmp); } // 7.5.2.2) foreach (JToken item in (JArray)languageValue) { // 7.5.2.2.1) if (!(item.Type == JTokenType.String)) { throw new JsonLdError(JsonLdError.Error.InvalidLanguageMapValue, "Expected " + item .ToString() + " to be a string"); } // 7.5.2.2.2) JObject tmp = new JObject(); tmp["@value"] = item; tmp["@language"] = language.ToLower(); ((JArray)expandedValue).Add(tmp); } } } else { // 7.6) if ("@index".Equals(activeCtx.GetContainer(key)) && value is JObject) { // 7.6.1) expandedValue = new JArray(); // 7.6.2) JArray indexKeys = new JArray(value.GetKeys()); indexKeys.SortInPlace(); foreach (string index in indexKeys) { JToken indexValue = ((JObject)value)[index]; // 7.6.2.1) if (!(indexValue is JArray)) { JToken tmp = indexValue; indexValue = new JArray(); ((JArray)indexValue).Add(tmp); } // 7.6.2.2) indexValue = Expand(activeCtx, key, indexValue); // 7.6.2.3) foreach (JObject item in (JArray)indexValue) { // 7.6.2.3.1) if (!item.ContainsKey("@index")) { item["@index"] = index; } // 7.6.2.3.2) ((JArray)expandedValue).Add(item); } } } else { // 7.7) expandedValue = Expand(activeCtx, key, value); } } } // 7.8) if (expandedValue.IsNull()) { continue; } // 7.9) if ("@list".Equals(activeCtx.GetContainer(key))) { if (!(expandedValue is JObject) || !((JObject)expandedValue).ContainsKey("@list")) { JToken tmp = expandedValue; if (!(tmp is JArray)) { tmp = new JArray(); ((JArray)tmp).Add(expandedValue); } expandedValue = new JObject(); ((JObject)expandedValue)["@list"] = tmp; } } // 7.10) if (activeCtx.IsReverseProperty(key)) { // 7.10.1) if (!result.ContainsKey("@reverse")) { result["@reverse"] = new JObject(); } // 7.10.2) JObject reverseMap = (JObject)result["@reverse"]; // 7.10.3) if (!(expandedValue is JArray)) { JToken tmp = expandedValue; expandedValue = new JArray(); ((JArray)expandedValue).Add(tmp); } // 7.10.4) foreach (JToken item in (JArray)expandedValue) { // 7.10.4.1) if (item is JObject && (((JObject)item).ContainsKey("@value") || ((JObject)item).ContainsKey("@list"))) { throw new JsonLdError(JsonLdError.Error.InvalidReversePropertyValue); } // 7.10.4.2) if (!reverseMap.ContainsKey(expandedProperty)) { reverseMap[expandedProperty] = new JArray(); } // 7.10.4.3) if (item is JArray) { JsonLD.Collections.AddAll(((JArray)reverseMap[expandedProperty]), (JArray)item); } else { ((JArray)reverseMap[expandedProperty]).Add(item); } } } else { // 7.11) // 7.11.1) if (!result.ContainsKey(expandedProperty)) { result[expandedProperty] = new JArray(); } // 7.11.2) if (expandedValue is JArray) { JsonLD.Collections.AddAll(((JArray)result[expandedProperty]), (JArray)expandedValue); } else { ((JArray)result[expandedProperty]).Add(expandedValue); } } } // 8) if (result.ContainsKey("@value")) { // 8.1) // TODO: is this method faster than just using containsKey for // each? ICollection<string> keySet = new HashSet<string>(result.GetKeys()); keySet.Remove("@value"); keySet.Remove("@index"); bool langremoved = keySet.Remove("@language"); bool typeremoved = keySet.Remove("@type"); if ((langremoved && typeremoved) || !keySet.IsEmpty()) { throw new JsonLdError(JsonLdError.Error.InvalidValueObject, "value object has unknown keys" ); } // 8.2) JToken rval = result["@value"]; if (rval.IsNull()) { // nothing else is possible with result if we set it to // null, so simply return it return null; } // 8.3) if (!(rval.Type == JTokenType.String) && result.ContainsKey("@language")) { throw new JsonLdError(JsonLdError.Error.InvalidLanguageTaggedValue, "when @language is used, @value must be a string" ); } else { // 8.4) if (result.ContainsKey("@type")) { // TODO: is this enough for "is an IRI" if (!(result["@type"].Type == JTokenType.String) || ((string)result["@type"]).StartsWith("_:") || !((string)result["@type"]).Contains(":")) { throw new JsonLdError(JsonLdError.Error.InvalidTypedValue, "value of @type must be an IRI" ); } } } } else { // 9) if (result.ContainsKey("@type")) { JToken rtype = result["@type"]; if (!(rtype is JArray)) { JArray tmp = new JArray(); tmp.Add(rtype); result["@type"] = tmp; } } else { // 10) if (result.ContainsKey("@set") || result.ContainsKey("@list")) { // 10.1) if (result.Count > (result.ContainsKey("@index") ? 2 : 1)) { throw new JsonLdError(JsonLdError.Error.InvalidSetOrListObject, "@set or @list may only contain @index" ); } // 10.2) if (result.ContainsKey("@set")) { // result becomes an array here, thus the remaining checks // will never be true from here on // so simply return the value rather than have to make // result an object and cast it with every // other use in the function. return result["@set"]; } } } } // 11) if (result.ContainsKey("@language") && result.Count == 1) { result = null; } // 12) if (activeProperty == null || "@graph".Equals(activeProperty)) { // 12.1) if (result != null && (result.Count == 0 || result.ContainsKey("@value") || result .ContainsKey("@list"))) { result = null; } else { // 12.2) if (result != null && result.ContainsKey("@id") && result.Count == 1) { result = null; } } } // 13) return result; } else { // 2) If element is a scalar // 2.1) if (activeProperty == null || "@graph".Equals(activeProperty)) { return null; } return activeCtx.ExpandValue(activeProperty, element); } } }
internal static JArray GraphToRDF(JObject graph, UniqueNamer namer) { // use RDFDataset.graphToRDF JArray rval = new JArray(); foreach (string id in graph.GetKeys()) { JObject node = (JObject)graph[id]; JArray properties = new JArray(node.GetKeys()); properties.SortInPlace(); foreach (string property in properties) { var eachProperty = property; JToken items = node[eachProperty]; if ("@type".Equals(eachProperty)) { eachProperty = JSONLDConsts.RdfType; } else { if (JsonLdUtils.IsKeyword(eachProperty)) { continue; } } foreach (JToken item in (JArray)items) { // RDF subjects JObject subject = new JObject(); if (id.IndexOf("_:") == 0) { subject["type"] = "blank node"; subject["value"] = namer.GetName(id); } else { subject["type"] = "IRI"; subject["value"] = id; } // RDF predicates JObject predicate = new JObject(); predicate["type"] = "IRI"; predicate["value"] = eachProperty; // convert @list to triples if (JsonLdUtils.IsList(item)) { ListToRDF((JArray)((JObject)item)["@list"], namer, subject , predicate, rval); } else { // convert value or node object to triple object @object = ObjectToRDF(item, namer); IDictionary<string, object> tmp = new Dictionary<string, object>(); tmp["subject"] = subject; tmp["predicate"] = predicate; tmp["object"] = @object; rval.Add(tmp); } } } } return rval; }
/// <summary>Adds RDF triples for each graph in the given node map to an RDF dataset. /// </summary> /// <remarks>Adds RDF triples for each graph in the given node map to an RDF dataset. /// </remarks> /// <returns>the RDF dataset.</returns> /// <exception cref="JsonLdError">JsonLdError</exception> /// <exception cref="JsonLD.Core.JsonLdError"></exception> public virtual RDFDataset ToRDF() { // TODO: make the default generateNodeMap call (i.e. without a // graphName) create and return the nodeMap JObject nodeMap = new JObject(); nodeMap["@default"] = new JObject(); GenerateNodeMap(this.value, nodeMap); RDFDataset dataset = new RDFDataset(this); foreach (string graphName in nodeMap.GetKeys()) { // 4.1) if (JsonLdUtils.IsRelativeIri(graphName)) { continue; } JObject graph = (JObject)nodeMap[graphName ]; dataset.GraphToRDF(graphName, graph); } return dataset; }
/// <summary>Converts RDF statements into JSON-LD.</summary> /// <remarks>Converts RDF statements into JSON-LD.</remarks> /// <param name="statements">the RDF statements.</param> /// <param name="options">the RDF conversion options.</param> /// <param name="callback">(err, output) called once the operation completes.</param> /// <exception cref="JSONLDProcessingError">JSONLDProcessingError</exception> /// <exception cref="JsonLD.Core.JsonLdError"></exception> public virtual JArray FromRDF(RDFDataset dataset) { // 1) JObject defaultGraph = new JObject(); // 2) JObject graphMap = new JObject(); graphMap["@default"] = defaultGraph; // 3/3.1) foreach (string name in dataset.GraphNames()) { IList<RDFDataset.Quad> graph = dataset.GetQuads(name); // 3.2+3.4) JObject nodeMap; if (!graphMap.ContainsKey(name)) { nodeMap = new JObject(); graphMap[name] = nodeMap; } else { nodeMap = (JObject)graphMap[name]; } // 3.3) if (!"@default".Equals(name) && !Obj.Contains(defaultGraph, name)) { defaultGraph[name] = new JsonLdApi.NodeMapNode(this, name); } // 3.5) foreach (RDFDataset.Quad triple in graph) { string subject = triple.GetSubject().GetValue(); string predicate = triple.GetPredicate().GetValue(); RDFDataset.Node @object = triple.GetObject(); // 3.5.1+3.5.2) JsonLdApi.NodeMapNode node; if (!nodeMap.ContainsKey(subject)) { node = new JsonLdApi.NodeMapNode(this, subject); nodeMap[subject] = node; } else { node = (NodeMapNode)nodeMap[subject]; } // 3.5.3) if ((@object.IsIRI() || @object.IsBlankNode()) && !nodeMap.ContainsKey(@object.GetValue ())) { nodeMap[@object.GetValue()] = new JsonLdApi.NodeMapNode(this, @object.GetValue()); } // 3.5.4) if (JSONLDConsts.RdfType.Equals(predicate) && (@object.IsIRI() || @object.IsBlankNode ()) && !opts.GetUseRdfType()) { JsonLdUtils.MergeValue(node, "@type", @object.GetValue()); continue; } // 3.5.5) JObject value = @object.ToObject(opts.GetUseNativeTypes()); // 3.5.6+7) JsonLdUtils.MergeValue(node, predicate, value); // 3.5.8) if (@object.IsBlankNode() || @object.IsIRI()) { // 3.5.8.1-3) ((NodeMapNode)nodeMap[@object.GetValue()]).usages.Add(new JsonLdApi.UsagesNode(this, node, predicate , value)); } } } // 4) foreach (string name_1 in graphMap.GetKeys()) { JObject graph = (JObject)graphMap[name_1]; // 4.1) if (!graph.ContainsKey(JSONLDConsts.RdfNil)) { continue; } // 4.2) JsonLdApi.NodeMapNode nil = (NodeMapNode)graph[JSONLDConsts.RdfNil]; // 4.3) foreach (JsonLdApi.UsagesNode usage in nil.usages) { // 4.3.1) JsonLdApi.NodeMapNode node = usage.node; string property = usage.property; JObject head = usage.value; // 4.3.2) JArray list = new JArray(); JArray listNodes = new JArray(); // 4.3.3) while (JSONLDConsts.RdfRest.Equals(property) && node.IsWellFormedListNode()) { // 4.3.3.1) list.Add(((JArray)node[JSONLDConsts.RdfFirst])[0]); // 4.3.3.2) listNodes.Add((string)node["@id"]); // 4.3.3.3) JsonLdApi.UsagesNode nodeUsage = node.usages[0]; // 4.3.3.4) node = nodeUsage.node; property = nodeUsage.property; head = nodeUsage.value; // 4.3.3.5) if (!JsonLdUtils.IsBlankNode(node)) { break; } } // 4.3.4) if (JSONLDConsts.RdfFirst.Equals(property)) { // 4.3.4.1) if (JSONLDConsts.RdfNil.Equals(node["@id"])) { continue; } // 4.3.4.3) string headId = (string)head["@id"]; // 4.3.4.4-5) head = (JObject)((JArray)graph[headId][JSONLDConsts.RdfRest ])[0]; // 4.3.4.6) list.RemoveAt(list.Count - 1); listNodes.RemoveAt(listNodes.Count - 1); } // 4.3.5) JsonLD.Collections.Remove(head, "@id"); // 4.3.6) JsonLD.Collections.Reverse(list); // 4.3.7) head["@list"] = list; // 4.3.8) foreach (string nodeId in listNodes) { JsonLD.Collections.Remove(graph, nodeId); } } } // 5) JArray result = new JArray(); // 6) JArray ids = new JArray(defaultGraph.GetKeys()); ids.SortInPlace(); foreach (string subject_1 in ids) { JsonLdApi.NodeMapNode node = (NodeMapNode)defaultGraph[subject_1]; // 6.1) if (graphMap.ContainsKey(subject_1)) { // 6.1.1) node["@graph"] = new JArray(); // 6.1.2) JArray keys = new JArray(graphMap[subject_1].GetKeys()); keys.SortInPlace(); foreach (string s in keys) { JsonLdApi.NodeMapNode n = (NodeMapNode)graphMap[subject_1][s]; if (n.Count == 1 && n.ContainsKey("@id")) { continue; } ((JArray)node["@graph"]).Add(n.Serialize()); } } // 6.2) if (node.Count == 1 && node.ContainsKey("@id")) { continue; } result.Add(node.Serialize()); } return result; }
/// <exception cref="JsonLD.Core.JsonLdError"></exception> private bool FilterNode(JsonLdApi.FramingContext state, JObject node, JObject frame) { JToken types = frame["@type"]; if (!types.IsNull()) { if (!(types is JArray)) { throw new JsonLdError(JsonLdError.Error.SyntaxError, "frame @type must be an array" ); } JToken nodeTypes = node["@type"]; if (nodeTypes.IsNull()) { nodeTypes = new JArray(); } else { if (!(nodeTypes is JArray)) { throw new JsonLdError(JsonLdError.Error.SyntaxError, "node @type must be an array" ); } } if (((JArray)types).Count == 1 && ((JArray)types)[0] is JObject && ((JObject)((JArray)types)[0]).Count == 0) { return !((JArray)nodeTypes).IsEmpty(); } else { foreach (JToken i in (JArray)nodeTypes) { foreach (JToken j in (JArray)types) { if (JsonLdUtils.DeepCompare(i, j)) { return true; } } } return false; } } else { foreach (string key in frame.GetKeys()) { if ("@id".Equals(key) || !JsonLdUtils.IsKeyword(key) && !(node.ContainsKey(key))) { return false; } } return true; } }
/// <exception cref="JsonLD.Core.JsonLdError"></exception> private JObject FilterNodes(JsonLdApi.FramingContext state, JObject nodes, JObject frame) { JObject rval = new JObject(); foreach (string id in nodes.GetKeys()) { JObject element = (JObject)nodes[id]; if (element != null && FilterNode(state, element, frame)) { rval[id] = element; } } return rval; }
/// <summary>Frames subjects according to the given frame.</summary> /// <remarks>Frames subjects according to the given frame.</remarks> /// <param name="state">the current framing state.</param> /// <param name="subjects">the subjects to filter.</param> /// <param name="frame">the frame.</param> /// <param name="parent">the parent subject or top-level array.</param> /// <param name="property">the parent property, initialized to null.</param> /// <exception cref="JSONLDProcessingError">JSONLDProcessingError</exception> /// <exception cref="JsonLD.Core.JsonLdError"></exception> private void Frame(JsonLdApi.FramingContext state, JObject nodes , JObject frame, JToken parent, string property) { // filter out subjects that match the frame JObject matches = FilterNodes(state, nodes, frame); // get flags for current frame bool embedOn = GetFrameFlag(frame, "@embed", state.embed); bool explicitOn = GetFrameFlag(frame, "@explicit", state.@explicit); // add matches to output JArray ids = new JArray(matches.GetKeys()); ids.SortInPlace(); foreach (string id in ids) { if (property == null) { state.embeds = new Dictionary<string, JsonLdApi.EmbedNode>(); } // start output JObject output = new JObject(); output["@id"] = id; // prepare embed meta info JsonLdApi.EmbedNode embeddedNode = new JsonLdApi.EmbedNode(this); embeddedNode.parent = parent; embeddedNode.property = property; // if embed is on and there is an existing embed if (embedOn && state.embeds.ContainsKey(id)) { JsonLdApi.EmbedNode existing = state.embeds[id]; embedOn = false; if (existing.parent is JArray) { foreach (JToken p in (JArray)(existing.parent)) { if (JsonLdUtils.CompareValues(output, p)) { embedOn = true; break; } } } else { // existing embed's parent is an object if (((JObject)existing.parent).ContainsKey(existing.property)) { foreach (JToken v in (JArray)((JObject)existing.parent)[existing.property]) { if (v is JObject && ((JObject)v)["@id"].SafeCompare(id)) { embedOn = true; break; } } } } // existing embed has already been added, so allow an overwrite if (embedOn) { RemoveEmbed(state, id); } } // not embedding, add output without any other properties if (!embedOn) { AddFrameOutput(state, parent, property, output); } else { // add embed meta info state.embeds[id] = embeddedNode; // iterate over subject properties JObject element = (JObject)matches[id]; JArray props = new JArray(element.GetKeys()); props.SortInPlace(); foreach (string prop in props) { // copy keywords to output if (JsonLdUtils.IsKeyword(prop)) { output[prop] = JsonLdUtils.Clone(element[prop]); continue; } // if property isn't in the frame if (!frame.ContainsKey(prop)) { // if explicit is off, embed values if (!explicitOn) { EmbedValues(state, element, prop, output); } continue; } // add objects JArray value = (JArray)element[prop]; foreach (JToken item in value) { // recurse into list if ((item is JObject) && ((JObject)item).ContainsKey("@list")) { // add empty list JObject list = new JObject(); list["@list"] = new JArray(); AddFrameOutput(state, output, prop, list); // add list objects foreach (JToken listitem in (JArray)((JObject)item)["@list" ]) { // recurse into subject reference if (JsonLdUtils.IsNodeReference(listitem)) { JObject tmp = new JObject(); string itemid = (string)((IDictionary<string, JToken>)listitem)["@id"]; // TODO: nodes may need to be node_map, // which is global tmp[itemid] = this.nodeMap[itemid]; Frame(state, tmp, (JObject)((JArray)frame[prop])[0], list , "@list"); } else { // include other values automatcially (TODO: // may need JsonLdUtils.clone(n)) AddFrameOutput(state, list, "@list", listitem); } } } else { // recurse into subject reference if (JsonLdUtils.IsNodeReference(item)) { JObject tmp = new JObject(); string itemid = (string)((JObject)item)["@id"]; // TODO: nodes may need to be node_map, which is // global tmp[itemid] = this.nodeMap[itemid]; Frame(state, tmp, (JObject)((JArray)frame[prop])[0], output , prop); } else { // include other values automatically (TODO: may // need JsonLdUtils.clone(o)) AddFrameOutput(state, output, prop, item); } } } } // handle defaults props = new JArray(frame.GetKeys()); props.SortInPlace(); foreach (string prop_1 in props) { // skip keywords if (JsonLdUtils.IsKeyword(prop_1)) { continue; } JArray pf = (JArray)frame[prop_1]; JObject propertyFrame = pf.Count > 0 ? (JObject)pf[0] : null; if (propertyFrame == null) { propertyFrame = new JObject(); } bool omitDefaultOn = GetFrameFlag(propertyFrame, "@omitDefault", state.omitDefault ); if (!omitDefaultOn && !output.ContainsKey(prop_1)) { JToken def = "@null"; if (propertyFrame.ContainsKey("@default")) { def = JsonLdUtils.Clone(propertyFrame["@default"]); } if (!(def is JArray)) { JArray tmp = new JArray(); tmp.Add(def); def = tmp; } JObject tmp1 = new JObject(); tmp1["@preserve"] = def; JArray tmp2 = new JArray(); tmp2.Add(tmp1); output[prop_1] = tmp2; } } // add output to parent AddFrameOutput(state, parent, property, output); } } }