我使用Rhino(17R4)时出错。
我的目标是使用jsbeautifier.js缩进javascript源代码。
这是我的代码:
import java.io.InputStream;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
public class JSBeautifier {
public String beautify(String jsSource) {
Context context = Context.enter();
Scriptable globalScope = context.initStandardObjects();
String beautify = getFileContents(JSBeautifier.class.getResourceAsStream("beautify.js"));
context.evaluateString(globalScope, beautify, "beautify", 1, null);
globalScope.put("source", globalScope, jsSource);
context.evaluateString(globalScope, "result = js_beautify(source);", "beautify", 1, null);
Object result = globalScope.get("result", globalScope);
return (String)result;
}
private String getFileContents(InputStream stream) {
StringBuffer contents = new StringBuffer("");
try {
byte[] readBytes = new byte[1024];
int i = 0;
while ((i = stream.read(readBytes)) > 0)
contents.append(new String(readBytes, 0, i));
} catch (Exception e) {
e.printStackTrace();
}
return contents.toString();
}
}
当我执行此代码时,它发生在异常下面。
org.mozilla.javascript.EcmaError: ReferenceError: "js_beautify" is not defined. (beautify#1)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3687)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3665)
at org.mozilla.javascript.ScriptRuntime.notFoundError(ScriptRuntime.java:3750)
at org.mozilla.javascript.ScriptRuntime.getNameFunctionAndThis(ScriptRuntime.java:2176)
at org.mozilla.javascript.optimizer.OptRuntime.callName(OptRuntime.java:61)
at org.mozilla.javascript.gen.beautify_2._c_script_0(beautify:1)
at org.mozilla.javascript.gen.beautify_2.call(beautify)
at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:394)
at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3091)
at org.mozilla.javascript.gen.beautify_2.call(beautify)
at org.mozilla.javascript.gen.beautify_2.exec(beautify)
at org.mozilla.javascript.Context.evaluateString(Context.java:1079)
at test.util.jsconverter.JSBeautifier.beautify(JSBeautifier.java:20)
如何解决此问题?
答案 0 :(得分:4)
问题在于beautify.js正在将其功能分配给全局范围中的变量
if (typeof define === "function") {
// Add support for require.js
define(function(require, exports, module) {
exports.js_beautify = js_beautify;
});
} else if (typeof exports !== "undefined") {
// Add support for CommonJS. Just put this file somewhere on your require.paths
// and you will be able to `var js_beautify = require("beautify").js_beautify`.
exports.js_beautify = js_beautify;
} else if (typeof window !== "undefined") {
// If we're running a web page and don't have either of the above, add our one global
window.js_beautify = js_beautify;
} else if (typeof global !== "undefined") {
// If we don't even have window, try global.
global.js_beautify = js_beautify;
}
因此,您必须创建一个可以将其功能分配给
的全局变量context.evaluateString(globalScope, "var global = {};", "global", 1, null);
context.evaluateString(globalScope, beautify, "beautify", 1, null);
globalScope.put("source", globalScope, jsSource);
context.evaluateString(globalScope, "result = global.js_beautify(source);", "beautify", 1, null);
答案 1 :(得分:1)
result = js_beautifier(source);
这是js_beautify
。