WIP

node_modules/n3/lib/N3StreamParser.js

@@ -0,0 +1,74 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _readableStream = require("readable-stream");
+var _N3Parser = _interopRequireDefault(require("./N3Parser"));
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
+// **N3StreamParser** parses a text stream into a quad stream.
+
+// ## Constructor
+class N3StreamParser extends _readableStream.Transform {
+  constructor(options) {
+    super({
+      decodeStrings: true
+    });
+    this._readableState.objectMode = true;
+
+    // Set up parser with dummy stream to obtain `data` and `end` callbacks
+    const parser = new _N3Parser.default(options);
+    let onData, onEnd;
+    const callbacks = {
+      // Handle quads by pushing them down the pipeline
+      onQuad: (error, quad) => {
+        error && this.emit('error', error) || quad && this.push(quad);
+      },
+      // Emit prefixes through the `prefix` event
+      onPrefix: (prefix, uri) => {
+        this.emit('prefix', prefix, uri);
+      }
+    };
+    if (options && options.comments) callbacks.onComment = comment => {
+      this.emit('comment', comment);
+    };
+    parser.parse({
+      on: (event, callback) => {
+        switch (event) {
+          case 'data':
+            onData = callback;
+            break;
+          case 'end':
+            onEnd = callback;
+            break;
+        }
+      }
+    }, callbacks);
+
+    // 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) {
+    stream.on('data', chunk => {
+      this.write(chunk);
+    });
+    stream.on('end', () => {
+      this.end();
+    });
+    stream.on('error', error => {
+      this.emit('error', error);
+    });
+    return this;
+  }
+}
+exports.default = N3StreamParser;