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var pathUtil = require("path"),
getImportGlobalsSrc = require("./getImportGlobalsSrc.js"); // must be relative to lib/index.js because of forwardBrowserifyRewire()
/**
* Clones an object deeply. Used to clone the module-object that is
* stored in the cache. Because browserify doesn't create the module-
* object newly if the module is executed again we can't modify the
* exports object directly. Instead of we have to make an independent copy.
*
* @param {!Object} obj
* @return {Object}
*/
function clone(obj) {
var target = {},
value,
key;
for (key in obj) {
if (obj.hasOwnProperty(key)) {
value = obj[key];
if (Array.isArray(value)) {
target[key] = value.slice(0);
} else if (typeof value === "object" && value !== null) {
target[key] = clone(value);
} else {
target[key] = value;
}
}
}
return target;
}
// Saves all setters and getters for every module according to its filename
var registry = {};
/**
* Executes the given module and adds a special setter and getter that allow you to set and get private variables.
* The parentModulePath is usually set by the requireProxy.
*
* @param {!String} parentModulePath __filename of the module, that wants to rewire() another module.
* @param {!String} path path to the module that shall be rewired
* @return {Object} the rewired module
*/
function browserifyRewire(parentModulePath, path) {
var cached,
originalModule,
originalExports,
absPath,
rewiredExports = {},
registryEntry,
_require = require; // hide it from browserify to avoid annoying console warnings
// Normalize path with file extensions
absPath = pathUtil.resolve(parentModulePath, path);
// Retrieve original module from cache
cached = originalModule = require.cache[absPath];
if (cached) {
// If there is already a module instance in the cache we have to store the original exports-object
// manually so it won't be overwritten by the next execution. This is all necessary due to browserify's
// odd way of module creation.
originalExports = originalModule.exports;
originalModule.exports = rewiredExports;
// Delete the original module from the cache so the next call to _require()
// executes the module
delete require.cache[absPath];
}
// Require module to trigger rewire.register().
_require(absPath);
originalModule = require.cache[absPath];
// Now we're cloning the exports-obj so later modifications of the rewired module won't influence the
// cached, original version of this module.
rewiredExports = clone(originalModule.exports);
if (cached) {
// Restore original exports
originalModule.exports = originalExports;
}
// Get registry entry of the target module
registryEntry = registry[absPath];
// Apply setter and getters
rewiredExports.__set__ = registryEntry.setter;
rewiredExports.__get__ = registryEntry.getter;
return rewiredExports;
}
/**
* Registers the setter and getter of every module according to its filename
*
* @param {!String} filename the absolute path to the module (module id)
* @param {!Function} setter
* @param {!Function} getter
*/
browserifyRewire.register = function (filename, module, setter, getter) {
registry[filename] = {
module: module,
setter: setter,
getter: getter
};
};
/**
* Provides a special require-proxy. Every module calls require("rewire").getProxy(require, __filename) at the
* beginning and overrides its own require with this proxy.
*
* This is necessary to call rewire() with the original __filename. Thus you can use rewire() like require().
*
* @param {!Function} internalRequire the module's own require
* @param {String} dirname the __dirname of the module
* @return {Function} requireProxy
*/
browserifyRewire.getProxy = function (internalRequire, dirname) {
var rewire = internalRequire("rewire"),
rewireProxyInit = false;
function copyProperties(from, to) {
var key;
for (key in from) {
if (from.hasOwnProperty(key)) {
to[key] = from[key];
}
}
}
function rewireProxy(path, cache) {
return rewire(dirname, path, cache);
}
function requireProxy(path) {
if (path === "rewire") {
if (rewireProxyInit === false) {
copyProperties(rewire, rewireProxy); // lazy copy
rewireProxyInit = true;
}
return rewireProxy;
} else {
return internalRequire(path);
}
}
copyProperties(internalRequire, requireProxy);
return requireProxy;
};
/**
* Scans for global vars and returns an evalable string that declares all globals as a var.
* This way a global variable can be overridden by __set__ without changing the global instance.
* It is executed each time again to include global variables that have been added later.
*
* @return {String}
*/
browserifyRewire.getImportGlobalsSrc = function () {
return getImportGlobalsSrc(['require','module','exports','__dirname','__filename','process']);
};
/**
* Returns a new object that inherits from the original module via prototype inheritance.
*
* Any changes to the module, e.g. assigning another exports-object will now modify the object
* instead of original module.
*
* @param {Object} originalModule
* @return {Object} the independent module
*/
browserifyRewire.getIndependentModule = function (originalModule) {
var independentModule;
function IndependentModule() {}
IndependentModule.prototype = originalModule;
independentModule = new IndependentModule();
independentModule.exports = originalModule.exports;
return independentModule;
};
module.exports = browserifyRewire;
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