How to get the function in the return value about js-interpreter HOT 2 CLOSED

My understanding is that you are expecting a user to enter some code (hopefully a function) into your editor, and you want to know the function name that has been defined. For example, the user enters this code:

function foo() {
  alert('hello')
}

And you want to know that the function is called foo.

The best way I can think of is to compare the global variables before and after the code is injected.

// Create an empty interpreter with no code (and an initFunc for any custom API functions).
var myInterpreter = new Interpreter('', initFunc);
// Record the global names in an empty JavaScript environment.
var oldGlobals = Object.getOwnPropertyNames(myInterpreter.getGlobalScope().object.properties);
// Load the user's code.
myInterpreter.appendCode(code);
// Record the global names after the user's code has been added.
var newGlobals = Object.getOwnPropertyNames(myInterpreter.getGlobalScope().object.properties);
// Compute the difference to determine what's new.
var userGlobals = newGlobals.filter(n => !oldGlobals.includes(n));

This produces an array of all globals which the user's code created. Hopefully that will be the function they defined. But it could also be a global variable. You can use this code to find out if a particular value is a function or not:

myInterpreter.getValueFromScope('foo').class === 'Function'

from js-interpreter.

I think a better approach would be to parse the user-provided code using Acorn and extract the function names from the generated AST. This avoids a whole host of potential pitfalls and additionally obviates the need to use JS Interpreter for this task.

from js-interpreter.