从nodejs脚本内部解析nodejs(parsing nodejs from inside of a nodejs script)

从nodejs脚本内部解析nodejs(parsing nodejs from inside of a nodejs script)

是否有可能解析节点js文件并从另一个节点js文件内部运行部分代码？

我有一个node.js文件，我试图从另一个node.js脚本中解析。 我不控制文件的内容，但是它是有效的node.js，它在代码中总是有一个函数调用：getParameterDefinitions

这是我要解析的文件： https ： //github.com/jscad/OpenJSCAD.org/blob/master/examples/gear.jscad

特别是我想从我的代码中getParameterDefinitions返回的JSON数组作为变量。

这是我目前的代码：

const fs = require('fs') inputFile = 'gear.jscad' let src = fs.readFileSync(inputFile, 'UTF8') console.log(src) params = Parse(src,'getParameterDefinitions') //how to write this line?

我如何让节点解析javascript并运行函数让结果返回到params变量中。

is it possible to parse a node js file and run part of the code from inside of another node js file?

I have a node.js file that I am trying to parse from inside another node.js script. I don't control the contents of the file, but it is valid node.js and it always has a function inside of the code called: getParameterDefinitions

Here is a file I am trying to parse: https://github.com/jscad/OpenJSCAD.org/blob/master/examples/gear.jscad

Specifically I want the JSON array returned from getParameterDefinitions as a variable in my code.

Here is the code I have currently:

const fs = require('fs') inputFile = 'gear.jscad' let src = fs.readFileSync(inputFile, 'UTF8') console.log(src) params = Parse(src,'getParameterDefinitions') //how to write this line?

How can I have node parse the javascript and run the function to get me back the results into the params variable.

最满意答案

有些人可能会建议使用eval 。 但是有一个更简洁的方法： Function构造函数 - 参见这里 。 然后这样做：

const getGetParameterDefinitions = new Function(src + ";\nreturn getParameterDefinitions;"); const getParameterDefinitions = getGetParameterDefinitions(); const params = getParameterDefinitions();

否则这个：

const getParameterDefinitions = new Function(src + ";\nreturn getParameterDefinitions();"); const params = getParameterDefinitions();

（注意：在这两种情况下， Function的参数略有不同。）

这仍然是一个坏主意 - 除非你相信编写代码的人，否则不要这样做。

另外，我假设函数getParameterDefinitions是在src脚本的最外层范围内声明的。

Some people may suggest using eval. But there's a slightly cleaner way: the Function constructor - see here. Then do this:

const getGetParameterDefinitions = new Function(src + ";\nreturn getParameterDefinitions;"); const getParameterDefinitions = getGetParameterDefinitions(); const params = getParameterDefinitions();

or else this:

const getParameterDefinitions = new Function(src + ";\nreturn getParameterDefinitions();"); const params = getParameterDefinitions();

(Note: the argument to Function is slightly different in these two cases.)

This is still a bad idea though - don't do it unless you trust the people who wrote the code.

Also, I'm assuming that the function getParameterDefinitions is declared in the outermost scope of the src script.