| 'use strict'; |
| |
| var TOKEN = /([!#\$%&'\*\+\-\.\^_`\|~0-9A-Za-z]+)/, |
| NOTOKEN = /([^!#\$%&'\*\+\-\.\^_`\|~0-9A-Za-z])/g, |
| QUOTED = /"((?:\\[\x00-\x7f]|[^\x00-\x08\x0a-\x1f\x7f"])*)"/, |
| PARAM = new RegExp(TOKEN.source + '(?:=(?:' + TOKEN.source + '|' + QUOTED.source + '))?'), |
| EXT = new RegExp(TOKEN.source + '(?: *; *' + PARAM.source + ')*', 'g'), |
| EXT_LIST = new RegExp('^' + EXT.source + '(?: *, *' + EXT.source + ')*$'), |
| NUMBER = /^-?(0|[1-9][0-9]*)(\.[0-9]+)?$/; |
| |
| var hasOwnProperty = Object.prototype.hasOwnProperty; |
| |
| var Parser = { |
| parseHeader: function(header) { |
| var offers = new Offers(); |
| if (header === '' || header === undefined) return offers; |
| |
| if (!EXT_LIST.test(header)) |
| throw new SyntaxError('Invalid Sec-WebSocket-Extensions header: ' + header); |
| |
| var values = header.match(EXT); |
| |
| values.forEach(function(value) { |
| var params = value.match(new RegExp(PARAM.source, 'g')), |
| name = params.shift(), |
| offer = {}; |
| |
| params.forEach(function(param) { |
| var args = param.match(PARAM), key = args[1], data; |
| |
| if (args[2] !== undefined) { |
| data = args[2]; |
| } else if (args[3] !== undefined) { |
| data = args[3].replace(/\\/g, ''); |
| } else { |
| data = true; |
| } |
| if (NUMBER.test(data)) data = parseFloat(data); |
| |
| if (hasOwnProperty.call(offer, key)) { |
| offer[key] = [].concat(offer[key]); |
| offer[key].push(data); |
| } else { |
| offer[key] = data; |
| } |
| }, this); |
| offers.push(name, offer); |
| }, this); |
| |
| return offers; |
| }, |
| |
| serializeParams: function(name, params) { |
| var values = []; |
| |
| var print = function(key, value) { |
| if (value instanceof Array) { |
| value.forEach(function(v) { print(key, v) }); |
| } else if (value === true) { |
| values.push(key); |
| } else if (typeof value === 'number') { |
| values.push(key + '=' + value); |
| } else if (NOTOKEN.test(value)) { |
| values.push(key + '="' + value.replace(/"/g, '\\"') + '"'); |
| } else { |
| values.push(key + '=' + value); |
| } |
| }; |
| |
| for (var key in params) print(key, params[key]); |
| |
| return [name].concat(values).join('; '); |
| } |
| }; |
| |
| var Offers = function() { |
| this._byName = {}; |
| this._inOrder = []; |
| }; |
| |
| Offers.prototype.push = function(name, params) { |
| if (!hasOwnProperty.call(this._byName, name)) |
| this._byName[name] = []; |
| |
| this._byName[name].push(params); |
| this._inOrder.push({name: name, params: params}); |
| }; |
| |
| Offers.prototype.eachOffer = function(callback, context) { |
| var list = this._inOrder; |
| for (var i = 0, n = list.length; i < n; i++) |
| callback.call(context, list[i].name, list[i].params); |
| }; |
| |
| Offers.prototype.byName = function(name) { |
| return this._byName[name] || []; |
| }; |
| |
| Offers.prototype.toArray = function() { |
| return this._inOrder.slice(); |
| }; |
| |
| module.exports = Parser; |