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var Module = require("module"),
fs = require("fs"),
getImportGlobalsSrc = require("./getImportGlobalsSrc.js"),
getDefinePropertySrc = require("./getDefinePropertySrc.js"),
detectStrictMode = require("./detectStrictMode.js"),
moduleEnv = require("./moduleEnv.js");
/**
* Does actual rewiring the module. For further documentation @see index.js
*/
function internalRewire(parentModulePath, targetPath) {
var targetModule,
prelude,
appendix,
src;
// 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
// TODO Remove this switch on the next major release
/* istanbul ignore next because it will be removed soon */
if (Array.isArray(targetPath)) {
targetPath = targetPath[1];
}
// Create testModule as it would be created by require()
targetModule = new Module(targetPath, parentModulePath);
// We prepend a list of all globals declared with var so they can be overridden (without changing original globals)
prelude = getImportGlobalsSrc();
// The module src is wrapped inside a self-executing function.
// This is necessary to separate the module src from the preceding importGlobalsSrc,
// because the module src can be in strict mode.
// In strict mode eval() can only declare vars in the current scope. In this case our setters
// and getters won't work.
// @see http://whereswalden.com/2011/01/10/new-es5-strict-mode-support-new-vars-created-by-strict-mode-eval-code-are-local-to-that-code-only/
// It also circumvents a problem with identical global variables and function declarations
// @see https://github.com/jhnns/rewire/issues/56
prelude += "(function () { ";
// We append our special setter and getter.
appendix = "\n" + getDefinePropertySrc();
// End of self-executing function
appendix += "})();";
// 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) {
prelude = ' "use strict"; ' + prelude;
}
moduleEnv.inject(prelude, appendix);
moduleEnv.load(targetModule);
return targetModule.exports;
}
module.exports = internalRewire;
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