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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Routines used to normalize arguments to messaging functions.
function alignSendMessageArguments(args, hasOptionsArgument) {
// Align missing (optional) function arguments with the arguments that
// schema validation is expecting, e.g.
// extension.sendRequest(req) -> extension.sendRequest(null, req)
// extension.sendRequest(req, cb) -> extension.sendRequest(null, req, cb)
if (!args || !args.length)
return null;
var lastArg = args.length - 1;
// responseCallback (last argument) is optional.
var responseCallback = null;
if (typeof args[lastArg] == 'function')
responseCallback = args[lastArg--];
var options = null;
if (hasOptionsArgument && lastArg >= 1) {
// options (third argument) is optional. It can also be ambiguous which
// argument it should match. If there are more than two arguments remaining,
// options is definitely present:
if (lastArg > 1) {
options = args[lastArg--];
} else {
// Exactly two arguments remaining. If the first argument is a string,
// it should bind to targetId, and the second argument should bind to
// request, which is required. In other words, when two arguments remain,
// only bind options when the first argument cannot bind to targetId.
if (!(args[0] === null || typeof args[0] == 'string'))
options = args[lastArg--];
}
}
// request (second argument) is required.
var request = args[lastArg--];
// targetId (first argument, extensionId in the manifest) is optional.
var targetId = null;
if (lastArg >= 0)
targetId = args[lastArg--];
if (lastArg != -1)
return null;
if (hasOptionsArgument)
return [targetId, request, options, responseCallback];
return [targetId, request, responseCallback];
}
exports.$set('alignSendMessageArguments', alignSendMessageArguments);
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