91 lines
2.0 KiB
JavaScript
91 lines
2.0 KiB
JavaScript
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'use strict';
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function isFunction(funktion) {
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return funktion && {}.toString.call(funktion) === '[object Function]';
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}
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// Default to complaining loudly when things don't go according to plan.
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var logger = console.error.bind(console);
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// Keep initialization idempotent.
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function shimmer(options) {
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if (options && options.logger) {
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if (!isFunction(options.logger)) logger("new logger isn't a function, not replacing");
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else logger = options.logger;
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}
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}
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function wrap(nodule, name, wrapper) {
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if (!nodule || !nodule[name]) {
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logger("no original function " + name + " to wrap");
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return;
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}
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if (!wrapper) {
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logger("no wrapper function");
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logger((new Error()).stack);
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return;
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}
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if (!isFunction(nodule[name]) || !isFunction(wrapper)) {
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logger("original object and wrapper must be functions");
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return;
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}
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var original = nodule[name]
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, wrapped = wrapper(original)
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;
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wrapped.__original = original;
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wrapped.__unwrap = function () {
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if (nodule[name] === wrapped) nodule[name] = original;
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};
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wrapped.__wrapped = true;
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nodule[name] = wrapped;
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return wrapped;
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}
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function massWrap(nodules, names, wrapper) {
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if (!nodules) {
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logger("must provide one or more modules to patch");
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logger((new Error()).stack);
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return;
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} else if (!Array.isArray(nodules)) {
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nodules = [nodules];
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}
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if (!(names && Array.isArray(names))) {
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logger("must provide one or more functions to wrap on modules");
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return;
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}
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nodules.forEach(function (nodule) {
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names.forEach(function (name) {
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wrap(nodule, name, wrapper);
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});
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});
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}
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function unwrap(nodule, name) {
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if (!nodule || !nodule[name]) {
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logger("no function to unwrap.");
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logger((new Error()).stack);
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return;
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}
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if (!nodule[name].__unwrap) {
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logger("no original to unwrap to -- has " + name + " already been unwrapped?");
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}
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else {
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return nodule[name].__unwrap();
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}
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}
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shimmer.wrap = wrap;
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shimmer.massWrap = massWrap;
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shimmer.unwrap = unwrap;
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module.exports = shimmer;
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