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Diffstat (limited to 'lib/bundlers/injectRewire.js')
| -rw-r--r-- | lib/bundlers/injectRewire.js | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/lib/bundlers/injectRewire.js b/lib/bundlers/injectRewire.js new file mode 100644 index 0000000..dfd56a4 --- /dev/null +++ b/lib/bundlers/injectRewire.js @@ -0,0 +1,54 @@ +"use strict"; // run code in ES5 strict mode + +var path = require("path"), + getRewireRequires = require("./getRewireRequires.js"), + detectStrictMode = require("../detectStrictMode.js"); + +/** + * Gets called by the bundler for every module. Injects special code so rewire is able to access private variables. + * + * @param {String} src the module's src + * @param {String} filename the module's filename + * @param {String} settersAndGettersSrc source that injects the setters and getters into the module scope + * @return {String} + */ +function injectRewire(src, filename, settersAndGettersSrc) { + // Convert back slashes to normal slashes on windows. + if (path.sep !== "/") { + filename = filename.split(path.sep).join("/"); + } + + // We don't want to inject this code at the beginning of a rewire/lib-module. Otherwise + // it would cause a black hole that devours our universe. + if (filename.indexOf("/rewire/lib/") === -1) { + src = + // Trying to hide the injected line in the debug view with extra whitespaces. + ' ' + + '/* this line was injected by rewire() */ ' + // Comment for the curious developer + + // Now all global variables are declared with a var statement so they can be changed via __set__() + // without influencing global objects. + 'var global = window; ' + // window is our new global object + 'eval(require("rewire").getImportGlobalsSrc()); ' + + + // The module src is wrapped inside a self-executing function. + // This is necessary to separate the module src from the preceding eval(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 https://developer.mozilla.org/en/JavaScript/Strict_mode#Making_eval_and_arguments_simpler + "(function () { " + + + // If the module uses strict mode we must ensure that "use strict" stays at the beginning of the function. + (detectStrictMode(src)? ' "use strict"; ': ' ') + + + settersAndGettersSrc + "\n" + + src + + + " })();"; + } + + return src; +} + +module.exports = injectRewire;
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