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var Module = require("module"),
fs = require("fs"),
__get__ = require("./__get__.js"),
__set__ = require("./__set__.js"),
getImportGlobalsSrc = require("./getImportGlobalsSrc.js"),
detectStrictMode = require("./detectStrictMode.js"),
moduleWrapper0 = Module.wrapper[0], // caching original wrapper
moduleWrapper1 = Module.wrapper[1]; // caching original wrapper
function restoreOriginalWrappers() {
Module.wrapper[0] = moduleWrapper0;
Module.wrapper[1] = moduleWrapper1;
}
/**
* Does actual rewiring the module. For further documentation @see index.js
*/
function internalRewire(parentModulePath, targetPath) {
var testModule,
nodeRequire,
prepend,
append,
src;
/**
* Proxies the first require call in order to draw back all changes to the Module.wrapper.
* Thus our changes don't influence other modules
*
* @param {!String} path
*/
function requireProxy(path) {
restoreOriginalWrappers();
testModule.require = nodeRequire;
return nodeRequire.call(testModule, path); // node's require only works when "this" points to the module
}
// Checking params
if (typeof targetPath !== "string") {
throw new TypeError("Filename must be a string");
}
// Resolve full filename relative to the parent module
targetPath = Module._resolveFilename(targetPath, parentModulePath);
// Special support for older node versions that returned an array on Module._resolveFilename
// @see https://github.com/joyent/node/blob/865b077819a9271a29f982faaef99dc635b57fbc/lib/module.js#L319
if (Array.isArray(targetPath)) {
targetPath = targetPath[1];
}
// Create testModule as it would be created by require()
testModule = new Module(targetPath, parentModulePath);
// Patching requireProxy
nodeRequire = testModule.require;
testModule.require = requireProxy;
// We prepend a list of all globals declared with var so they can be overridden (without changing original globals)
prepend = getImportGlobalsSrc();
// We append our special setter and getter.
append = "module.exports.__set__ = " + __set__.toString() + "; ";
append += "module.exports.__get__ = " + __get__.toString() + "; ";
// Check if the module uses the strict mode.
// If so we must ensure that "use strict"; stays at the beginning of the module.
src = fs.readFileSync(targetPath, "utf8");
if (detectStrictMode(src) === true) {
prepend = ' "use strict"; ' + prepend;
}
// Apply prepend and appends
Module.wrapper[0] = moduleWrapper0 + prepend;
Module.wrapper[1] = append + moduleWrapper1;
//console.log(Module.wrapper);
// Let the show begin
testModule.load(testModule.id);
// This is only necessary if nothing has been required within the module
restoreOriginalWrappers();
return testModule.exports;
}
module.exports = internalRewire;
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