jspurefix
Version:
pure node js fix engine
69 lines • 2.13 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const fix_duplex_1 = require("./fix-duplex");
class StringDuplex extends fix_duplex_1.FixDuplex {
constructor(text = '', chunks = false) {
super();
this.text = text;
this.chunks = chunks;
this.readable = StringDuplex.makeReadable(text, chunks);
this.writable = StringDuplex.makeWritable();
}
static makeReadable(text, chunks) {
const Readable = require('stream').Readable;
let total = 0;
const reader = {
read: (size) => {
total += size;
if (text.length > 0 && total > text.length) {
readable.push(null);
}
}
};
const readable = new Readable(reader);
if (!chunks) {
readable.push(text);
}
else {
StringDuplex.sendReaderChunks(text, readable);
}
return readable;
}
static makeWritable() {
const Writable = require('stream').Writable;
const writer = {
write: (data, _, done) => {
try {
receiver.emit('data', data);
done();
}
catch (e) {
done(e);
}
}
};
const receiver = new Writable(writer);
return receiver;
}
static sendReaderChunks(text, readable) {
let start = 0;
let iteration = 0;
let remaining = text.length;
while (remaining > 0) {
iteration++;
let chunk = Math.min(remaining, iteration % 10);
remaining -= chunk;
const end = start + chunk;
let snippet = text.slice(start, end);
readable.push(snippet);
start = end;
}
}
end() {
if (this.text.length === 0) {
this.readable.push(null);
}
}
}
exports.StringDuplex = StringDuplex;
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