62 lines
1.8 KiB
JavaScript
62 lines
1.8 KiB
JavaScript
Function.prototype.addRuntimeChecker = function() {
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var handler = {
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apply: function(target, thisArg, argumentValues) {
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// https://stackoverflow.com/a/31194949
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var argumentNames = target.toString()
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.replace(/[/][/].*$/mg,'') // strip single-line comments
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.replace(/\s+/g, '') // strip white space
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.replace(/[/][*][^/\*]*[*][/]/g, '') // strip multi-line comments
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.split('){', 1)[0].replace(/^[^(]*[(]/, '') // extract the parameters
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.replace(/=[^,]+/g, '') // strip any ES6 defaults
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.split(',').filter(Boolean); // split & filter [""]
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var argumentNamesWithoutTypes = [];
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for (var i = 0; i < argumentValues.length; i++) {
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// Get type from parameter name
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var match = argumentNames[i].match(/(.+)_(\w+)/);
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if (!match || match.length < 3) {
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argumentNamesWithoutTypes.push(argumentNames[i]);
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continue;
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}
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argumentNamesWithoutTypes.push(match[1]);
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var type = match[2];
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// Check types
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if (typeof argumentValues[i] !== type)
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throw new Error("Invalid argument #" + i + " - Expected " + type + ", got " + typeof argumentValues[i]);
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}
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// Assign actual names to window object before calling functions
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var oldWindow = {};
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for (var i = 0; i < argumentNamesWithoutTypes.length; i++) {
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var name = argumentNamesWithoutTypes[i];
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oldWindow[name] = window[name];
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window[name] = argumentValues[i];
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}
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// Call function
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var runtimeCheckerResult = target.apply(thisArg, argumentValues);
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// Re-assign old window values
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for (var name in oldWindow) {
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if (!oldWindow.hasOwnProperty(name)) continue;
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window[name] = oldWindow[name];
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}
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return runtimeCheckerResult;
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}
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};
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return new Proxy(this, handler);
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}
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window.typedFunction = function(func) {
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return func.addRuntimeChecker();
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}
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