如何通过javascript文件进行解析? [英] How to approach parsing through a javascript file?

问题描述

我想通过JavaScript进行解析，并找到特定库中的所有变量声明，属性和对函数的调用.

I want to parse through a javascript and find all the variable declarations, attributions, and calls to functions from a specific library.

最好的方法是什么:正则表达式，词法分析器(Lexer)使用已经完成的事情(确实存在吗?)....

What would be the best approach:regular expressions, lexer, use something already done that does that (does it exist?)....?

事实上，我要确保不修改对象名称空间和方法，而这是通过静态分析实现的.

What I want in fact is to be assured that an object namespace and methods are not modified, and this through a static analysis.

推荐答案

您无法使用正则表达式执行此操作，并且可能您也不想编写自己的 PyV8 .我建议您可以使用它.

You can not do it with regexes and probably you also do not want to write you own implementation of ecma-standard 262 (It is a total overkill).
As for me I dig google's V8 javascript engine, more precisely PyV8. I suggest you can use it.

如果遇到问题，可以使用我用来安装的代码(x64系统的pip安装有错误，因此我使用了源代码):

If you had problems there is the code I used to install (pip installation had an error for my x64 system, so I used sources):

apt-get install subversion scons libboost-python-dev
svn checkout http://v8.googlecode.com/svn/trunk/ v8
svn checkout http://pyv8.googlecode.com/svn/trunk/ pyv8
cd v8
export PyV8=`pwd`
cd ../pyv8
sudo python setup.py build
sudo python setup.py install

我记得这些命令并没有给我带来错误. (我复制粘贴了它，但是它起作用了)

As I remember these commands did not make errors for me. (I copypasted it but it worked)

问题本身的答案:
更复杂的hello wolrd示例，列出全局对象的一些变量:

Answer to the question itself:
More complex hello wolrd example, list some varibales of the global object:

import PyV8

class Global(PyV8.JSClass):      # define a compatible javascript class
    def hello(self):               # define a method
        print "Hello World"

    def alert(self, message): # my own alert function
        print type(message), '  ', message

    @property
    def GObject(self): return self

    def __setattr__(self, key, value):
        super(Global, self).__setattr__(key, value)
        print key, '=', value

G = Global()
ctxt = PyV8.JSContext(G)
ctxt.enter()
ctxt.eval("var a=hello; GObject.b=1.0; a();")
list_all_cmd = '''for (myKey in GObject){
alert(GObject[myKey]);
}'''
ctxt.eval(list_all_cmd)
ctxt.leave()

(在浏览器中，您应该将您称为全局对象-窗口)
该代码将输出:

(In browsers you should call you global object - Window)
This code will output:

b = 1
Hello World
<class '__main__.Global'>    <__main__.Global object at 0x7f202c9159d0>
<class '_PyV8.JSFunction'>    function () { [native code] }
<type 'int'>    1
<class '_PyV8.JSFunction'>    function () { [native code] }
<class '_PyV8.JSFunction'>    function () { [native code] }
<class '_PyV8.JSFunction'>    function () { [native code] }
<class '_PyV8.JSFunction'>    function () { [native code] }
<class '_PyV8.JSFunction'>    function () { [native code] }
<class '_PyV8.JSFunction'>    function () { [native code] }
<class '_PyV8.JSFunction'>    function () { [native code] }
<class '_PyV8.JSFunction'>    function () { [native code] }

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