我发现 Gameboy 脚本是用 javascript 编写的,我正在尝试让它在 java 中运行。 (我不是在寻找任何 java gameboy 模拟器)。
我有一个包含这两个文件的 JavaScript
function cout(e, t) {
java.lang.System.out.println("e = " + e + " t = " + t);
}
function setTimeout(expr, msec) {
if (typeof expr == "function") {
// save the global object and trailing args for later apply
var gobj = this;
var args = [].concat(arguments).slice(2);
var o = {actionPerformed: function(){expr.apply(gobj, args)}};
} else {
var o = {actionPerformed: function(){eval(expr)}};
}
var al = new java.awt.event.ActionListener(o);
var t = new javax.swing.Timer(msec, al);
t.start();
}
我在另一个 javascript 文件中有类似这样的内容
var frames = 0;
function tick() {
var a = (new Date().getTime() - tstart) - ttime;
while (a > settings[6]) {
ttime += settings[6];
a = (new Date().getTime() - tstart) - ttime;
gameboy.run()
frames++;
}
setTimeout(tick, settings[6])
}
下面是我的 Java Rhino 代码修改后的示例之一。
public class GameBoyJS {
/**
* Main entry point.
*
* Process arguments as would a normal Java program. Also
* create a new Context and associate it with the current thread.
* Then set up the execution environment and begin to
* execute scripts.
*/
public GameBoyJS()
{
Context context = Context.enter();
try {
Scriptable globalScope = context.initStandardObjects();
Reader base64LibReader = new InputStreamReader(getClass().getResourceAsStream("js/base64.js"));
//Reader msgpackLibReader = new InputStreamReader(getClass().getResourceAsStream("js/msgpack.js"));
Reader json2LibReader = new InputStreamReader(getClass().getResourceAsStream("js/json2.js"));
Reader terminalLibReader = new InputStreamReader(getClass().getResourceAsStream("js/terminal.js"));
//Reader resizeLibReader = new InputStreamReader(getClass().getResourceAsStream("js/resize.js"));
Reader GameBoyIOLibReader = new InputStreamReader(getClass().getResourceAsStream("js/GameBoyIO.js"));
Reader GameBoyCoreLibReader = new InputStreamReader(getClass().getResourceAsStream("js/GameBoyCore.js"));
//Reader XAudioServerLibReader = new InputStreamReader(getClass().getResourceAsStream("js/XAudioServer.js"));
//Replace this with your current gameboy rom file.
Reader RomLibReader = new InputStreamReader(getClass().getResourceAsStream("js/roms/crystal.js"));
//Put the files into javascript engine.
context.evaluateReader(globalScope, base64LibReader, "base64.js", 1, null);
//context.evaluateReader(globalScope, msgpackLibReader, "msgpack.js", 1, null);
context.evaluateReader(globalScope, json2LibReader, "json2.js", 1, null);
context.evaluateReader(globalScope, terminalLibReader, "terminal.js", 1, null);
//context.evaluateReader(globalScope, resizeLibReader, "resize.js", 1, null);
context.evaluateReader(globalScope, GameBoyIOLibReader, "GameBoyIO.js", 1, null);
context.evaluateReader(globalScope, GameBoyCoreLibReader, "GameBoyCore.js", 1, null);
//context.evaluateReader(globalScope, XAudioServerLibReader, "XAudioServer.js", 1, null);
context.evaluateReader(globalScope, RomLibReader, "crystal.js", 1, null);
// Add a global variable out that is a JavaScript reflection of the System.out variable:
Object wrappedOut = Context.javaToJS(System.out, globalScope);
ScriptableObject.putProperty(globalScope, "out", wrappedOut);
String code = "cout('Gameboy frame finished' + frames);";
context.evaluateString(globalScope, code, "<mem>", 1, null);
// Tried a hack here (this below is stupid but just to prove my suspensions)
for(int i = 0;i <=50; i++) {
context.evaluateString(globalScope, code, "<mem>", 1, null);
System.out.println("okay next frame");
}
} catch(IOException ioe) {
ioe.printStackTrace();
} finally {
Context.exit();
}
}
}
我试图按顺序检索帧计数器,但每次输出都是frame=1..这意味着脚本会在我想要的时候从头开始重新启动,以保持不间断并保留引用以前的变量,老实说,它甚至不应该重新启动,它应该继续使用 setTimeout() 函数
另外,如果问为什么 Rhino 总是占用我的 50% 的 CPU 和 100 MB 的内存,而它甚至没有做任何事情,那么当它到达 setTimeout 无限循环时,可能应该趋于平稳。 (如果可能的话)。
我想我需要 context.compileString
只是无法弄清楚。
最佳答案
找到的解决方案只需将其放入任何 JavaScript 中,然后再运行 rhino。
还有一个无法找到 JavaAdapter 的错误,请确保您使用的 Rhino 1.7R5 已修复此错误。
只需谷歌搜索rhino-1.7R5-SNAPSHOT.jar
(function(global) {
var timer = new java.util.Timer();
var counter = 1;
var ids = {};
global.setTimeout = function(fn, delay) {
var id = counter;
counter += 1;
ids[id] = new JavaAdapter(java.util.TimerTask, { run : fn });
timer.schedule(ids[id], delay);
return id;
};
global.clearTimeout = function(id) {
ids[id].cancel();
timer.purge();
delete ids[id];
};
global.setInterval = function(fn, delay) {
var id = counter;
counter += 1;
ids[id] = new JavaAdapter(java.util.TimerTask, { run : fn });
timer.schedule(ids[id], delay, delay);
return id;
};
global.clearInterval = global.clearTimeout;
// exports object in case of "isCommonJS"
global.exports = {};
})(this);
关于java - 如何让Rhino运行自定义的javascript setTimeout函数,无尽的eval,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22319199/