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Name	Size	Permission
buffer-util.js	2.84 KB	-rw-r--r--
constants.js	360 B	-rw-r--r--
event-target.js	6.44 KB	-rw-r--r--
extension.js	6.04 KB	-rw-r--r--
limiter.js	1.01 KB	-rw-r--r--
permessage-deflate.js	13.69 KB	-rw-r--r--
receiver.js	14.17 KB	-rw-r--r--
sender.js	12.37 KB	-rw-r--r--
stream.js	3.99 KB	-rw-r--r--
subprotocol.js	1.46 KB	-rw-r--r--
validation.js	3.07 KB	-rw-r--r--
websocket-server.js	13.38 KB	-rw-r--r--
websocket.js	30.49 KB	-rw-r--r--

Code Editor : subprotocol.js

'use strict';

const { tokenChars } = require('./validation');

/**
 * Parses the `Sec-WebSocket-Protocol` header into a set of subprotocol names.
 *
 * @param {String} header The field value of the header
 * @return {Set} The subprotocol names
 * @public
 */
function parse(header) {
  const protocols = new Set();
  let start = -1;
  let end = -1;
  let i = 0;

for (i; i < header.length; i++) {
    const code = header.charCodeAt(i);

if (end === -1 && tokenChars[code] === 1) {
      if (start === -1) start = i;
    } else if (
      i !== 0 &&
      (code === 0x20 /* ' ' */ || code === 0x09) /* '\t' */
    ) {
      if (end === -1 && start !== -1) end = i;
    } else if (code === 0x2c /* ',' */) {
      if (start === -1) {
        throw new SyntaxError(`Unexpected character at index ${i}`);
      }

if (end === -1) end = i;

const protocol = header.slice(start, end);

if (protocols.has(protocol)) {
        throw new SyntaxError(`The "${protocol}" subprotocol is duplicated`);
      }

protocols.add(protocol);
      start = end = -1;
    } else {
      throw new SyntaxError(`Unexpected character at index ${i}`);
    }
  }

if (start === -1 || end !== -1) {
    throw new SyntaxError('Unexpected end of input');
  }

const protocol = header.slice(start, i);

if (protocols.has(protocol)) {
    throw new SyntaxError(`The "${protocol}" subprotocol is duplicated`);
  }

protocols.add(protocol);
  return protocols;
}

module.exports = { parse };

${this.title}

Code Editor : subprotocol.js