Use JS-Interpreter for youtube

src/userscript.ts

@@ -20000,6 +20000,10 @@ var $$IMU_EXPORT$$;
 			size: 21482,
 			crc32: 337445473,
 			crc32_size: 2641711624
+		},
+		"JSInterpreter": {
+			name: "acorn_interpreter",
+			url: ""
 		}
 	};
 
@@ -31067,17 +31071,65 @@ var $$IMU_EXPORT$$;
 									return done(null, 6*60*60);
 								}
 
-								return done(new Function(["a"], match3[1]), 60*60);
+								let sanitized = match3[1];
+
+								let sanitize = function(code) {
+									return code
+										.replace(/new Date\("([^"]+)"\)/, function(_, x) {
+											return new Date(x).getTime();
+										})
+										.replace(/Math.pow\(([0-9]+),([0-9]+)\)/, function(_, x, y) {
+											return Math_pow(x, y);
+										});
+								};
+
+								while (true) {
+									let new_sanitized = sanitize(sanitized);
+									if (new_sanitized === sanitized)
+										break;
+
+									sanitized = new_sanitized;
+								}
+
+								get_library("JSInterpreter", options, options.do_request, function(JSInterpreter) {
+									if (!JSInterpreter) {
+										console_error(cache_key, "Unable to fetch JSInterpreter");
+										return done(null, false);
+									}
+
+									let source = "var replacer = function(a) {" + sanitized + "}; replacer(a);";
+
+									//let func = new Function(["a"], sanitized); // for comparison
+									let cache = {};
+
+									let replacer_wrap = function(n) {
+										if (n in cache)
+											return cache[n];
+
+										// TODO: move this out of replacer_wrap, somehow change "a".
+										let source = "var a = \"" + n + "\";var replacer = function(a) {" + sanitized + "}; replacer(a);";
+										let interp = new JSInterpreter(source);
+										let globalObject = interp.getGlobalScope().object;
+										//interp.setProperty(globalObject, "a", interp.nativeToPseudo(n));
+										interp.run();
+										cache[n] = interp.value;
+										return interp.value;
+									};
+
+									return done(replacer_wrap, 60*60);
+								});
 							});
 						});
 					};
 
 					var replace_n = function(n, cb) {
-						get_n_replacer(function(replacer) {
-							if (!replacer)
-								return cb(n);
+						api_cache.fetch("youtube_n:" + n, cb, function(done) {
+							get_n_replacer(function(replacer) {
+								if (!replacer)
+									return done(n, false);
 
-							cb(replacer(n));
+								done(replacer(n), 60*60);
+							});
 						});
 					};