electron-builder-lib/out/util/JsonStreamParser.js

electron-builder lib

"use strict";

Object.defineProperty(exports, "__esModule", {
    value: true
});
var ReadState;
(function (ReadState) {
    ReadState[ReadState["HEADER"] = 0] = "HEADER";
    ReadState[ReadState["BODY"] = 1] = "BODY";
})(ReadState || (ReadState = {}));
class JsonStreamParser {
    constructor(eventHandler) {
        this.eventHandler = eventHandler;
        this.state = ReadState.HEADER;
        this.buffer = "";
        this.remainingMessageLength = 0;
    }
    // https://github.com/EventSource/eventsource/blob/master/lib/eventsource.js
    parseIncoming(chunk) {
        let offset = 0;
        while (offset < chunk.length) {
            if (this.state === ReadState.HEADER) {
                if (chunk.length === 1 && chunk[0] === " ") {
                    // ping
                    return;
                }
                for (let i = offset; i < chunk.length; i++) {
                    if (chunk[i] === "{") {
                        this.buffer += chunk.substring(0, i);
                        this.remainingMessageLength = parseInt(this.buffer.trim(), 10);
                        this.buffer = "";
                        offset = i;
                        this.state = ReadState.BODY;
                        break;
                    }
                }
            }
            const end = offset + this.remainingMessageLength;
            this.buffer += chunk.substring(offset, Math.min(chunk.length, end));
            this.remainingMessageLength -= chunk.length - offset;
            if (this.remainingMessageLength > 0) {
                return;
            }
            offset = end;
            this.remainingMessageLength = 0;
            this.state = ReadState.HEADER;
            const data = JSON.parse(this.buffer);
            this.buffer = "";
            this.eventHandler(data);
        }
    }
}
exports.JsonStreamParser = JsonStreamParser; //# sourceMappingURL=JsonStreamParser.js.map