/
JSONLDContext.ts
79 lines (66 loc) · 1.96 KB
/
JSONLDContext.ts
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import URI from "./uri";
export default class JSONLDContext {
private rawData: object;
private aliases: object;
public constructor(blob: object) {
this.rawData = {};
this.aliases = {};
if (Array.isArray(blob)) {
this.processArray(blob);
} else {
this.rawData = blob;
this.processObject(blob);
}
}
public resolveIdentifier(name: string): string {
if (name.indexOf("://") > 0) {
// absolute URI
return name;
}
if (this.aliases[name]) {
return this.aliases[name];
}
if (name.indexOf(":") > 0) {
this.aliases[name] = this.expandURI(name);
return this.aliases[name];
}
return name;
}
private processObject(blob: object) {
for (const [name, data] of Object.entries(blob)) {
if (name.indexOf(":") >= 0) {
this.aliases[name] = this.expandURI(name);
}
if (typeof (data) === "object") {
if (data["@id"]) {
const rawId = data["@id"];
this.aliases[name] = this.expandURI(rawId);
}
} else if (typeof (data) === "string") {
this.aliases[name] = this.expandURI(data);
}
}
}
private expandURI(name: string) {
if (name.indexOf("://") > 0) {
// absolute URI
return name;
}
if (name.indexOf(":") < 0) {
return name;
}
const [prefix, rest] = name.split(":");
const namespace = this.rawData[prefix];
if (namespace) {
return URI.inNS(namespace, rest);
} else {
return name;
}
}
private processArray(blobs: object[]) {
for (const blob of blobs) {
this.rawData = Object.assign(this.rawData, blob);
this.processObject(blob);
}
}
}