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Utilities to parse grouped quads from the N3-family of serializations based on parser directives
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">// **N3GroupedStreamParser** parses a text stream into a quad stream.
import { Transform } from 'readable-stream';
import { ParserOptions, Quad} from 'n3';
import { EventEmitter } from "events";
import { NamedNode } from '@rdfjs/types';
import GroupedParser from './N3GroupedParser';
export default class GroupedStreamParser extends Transform {
constructor(options: ParserOptions) {
super({ decodeStrings: true });
this._readableState.objectMode = true;
if (!options)
options = {};
options.comments = true;
// Set up parser with dummy stream to obtain `data` and `end` callbacks
const parser = new GroupedParser(options);
let onData: Function;
let onEnd: Function;
let input = new EventEmitter();
input.on = (event: string, callback: Function): EventEmitter => {
switch (event) {
case 'data': onData = callback; break;
case 'end': onEnd = callback; break;
}
return this;
};
parser.parse(input, {
// Handle quads by pushing them in each currently active group.
// If no active group is currently in place, it is going to emit the quad in their own group as it appears.
onGroupedQuads: (error: Error, quadGroup: Quad[]) => {
if (error) {
this.emit('error', error);
}
else if (quadGroup) {
this.push(quadGroup);
}
},
// Emit prefixes through the `prefix` event
onPrefix: (prefix: string, iri: NamedNode) => { this.emit('prefix', prefix, iri); },
onComment: (comment: string) => { this.emit('comment', comment); },
});
// Implement Transform methods through parser callbacks
this._transform = (chunk, encoding, done) => { onData(chunk); done(); };
this._flush = done => { onEnd(); done(); };
}
// ### Parses a stream of strings
import(stream: any) {
stream.on('data', (chunk: string) => { this.write(chunk); });
stream.on('end', () => { this.end(); });
stream.on('error', (error: Error ) => { this.emit('error', error); });
return this;
}
}
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at 2024-08-31T18:03:42.853Z
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