74 lines
1.9 KiB
JavaScript
74 lines
1.9 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = void 0;
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var _readableStream = require("readable-stream");
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var _N3Parser = _interopRequireDefault(require("./N3Parser"));
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function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
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// **N3StreamParser** parses a text stream into a quad stream.
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// ## Constructor
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class N3StreamParser extends _readableStream.Transform {
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constructor(options) {
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super({
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decodeStrings: true
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});
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this._readableState.objectMode = true;
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// Set up parser with dummy stream to obtain `data` and `end` callbacks
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const parser = new _N3Parser.default(options);
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let onData, onEnd;
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const callbacks = {
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// Handle quads by pushing them down the pipeline
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onQuad: (error, quad) => {
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error && this.emit('error', error) || quad && this.push(quad);
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},
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// Emit prefixes through the `prefix` event
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onPrefix: (prefix, uri) => {
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this.emit('prefix', prefix, uri);
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}
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};
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if (options && options.comments) callbacks.onComment = comment => {
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this.emit('comment', comment);
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};
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parser.parse({
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on: (event, callback) => {
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switch (event) {
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case 'data':
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onData = callback;
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break;
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case 'end':
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onEnd = callback;
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break;
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}
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}
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}, callbacks);
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// Implement Transform methods through parser callbacks
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this._transform = (chunk, encoding, done) => {
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onData(chunk);
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done();
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};
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this._flush = done => {
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onEnd();
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done();
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};
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}
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// ### Parses a stream of strings
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import(stream) {
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stream.on('data', chunk => {
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this.write(chunk);
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});
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stream.on('end', () => {
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this.end();
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});
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stream.on('error', error => {
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this.emit('error', error);
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});
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return this;
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}
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}
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exports.default = N3StreamParser; |