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