mirror_xterm.js/addons/attach/attach.js

/*
 * Implements the attach method, that
 * attaches the terminal to a WebSocket stream.
 *
 * The bidirectional argument indicates, whether the terminal should
 * send data to the socket as well and is true, by default.
 */

(function (attach) {
    if (typeof define == 'function') {
        /*
         * Require.js is available
         */
        define(['../../src/xterm'], attach);
    } else {
        /*
         * Plain browser environment
         */
        attach(this.Xterm);
    }
})(function (Xterm) {
    /**
     * Attaches the current terminal to the given socket
     *
     * @param {WebSocket} socket - The socket to attach the current terminal
     * @param {boolean} bidirectional - Whether the terminal should send data
     *                                  to the socket as well
     * @param {boolean} buffered - Whether the rendering of incoming data
     *                             should happen instantly or at a maximum
     *                             frequency of 1 rendering per 10ms
     */
    Xterm.prototype.attach = function (socket, bidirectional, buffered) {
        var term = this;

        bidirectional = (typeof bidirectional == 'undefined') ? true : bidirectional;
        this.socket = socket;

        term._flushBuffer = function () {
            term.write(term._attachSocketBuffer);
            term._attachSocketBuffer = null;
            clearTimeout(term._attachSocketBufferTimer);
            term._attachSocketBufferTimer = null;
        };

        term._pushToBuffer = function (data) {
            if (term._attachSocketBuffer) {
                term._attachSocketBuffer += data;
            } else {
                term._attachSocketBuffer = data;
                setTimeout(term._flushBuffer, 10);
            }
        };

        term._getMessage = function (ev) {
            if (buffered) {
                term._pushToBuffer(ev.data);
            } else {
                term.write(ev.data);
            }
        };

        term._sendData = function (data) {
            socket.send(data);
        };

        socket.addEventListener('message', term._getMessage);

        if (bidirectional) {
            this.on('data', term._sendData);
        }

        socket.addEventListener('close', term.detach.bind(term, socket));
        socket.addEventListener('error', term.detach.bind(term, socket));
    };

    /**
     * Detaches the current terminal from the given socket
     *
     * @param {WebSocket} socket - The socket from which to detach the current
     *                             terminal
     */
    Xterm.prototype.detach = function (socket) {
        var term = this;

        term.off('data', term._sendData);

        socket = (typeof socket == 'undefined') ? term.socket : socket;

        if (socket) {
            socket.removeEventListener('message', term._getMessage);
        }

        delete term.socket;
    };
});