aaac7fed
 liuqimichale
add
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'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;
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