How to obtain arguments.callee.caller? - google-apps-script

Question

I am trying to find out the name of the function that called my Google Apps Script function, by using arguments.callee.caller as in How do you find out the caller function in JavaScript?, but it seems there's no such property exported. (However, arguments.callee exists.)
How can I get that calling function's name in Google Apps Script?
As a secondary question, why isn't arguments.callee.caller there?

Answer 1

I made this function:
function getCaller()
{
var stack;
var ret = "";
try
{
throw new Error("Whoops!");
}
catch (e)
{
stack = e.stack;
}
finally
{
var matchArr = stack.match(/\(.*\)/g);
if (matchArr.length > 2)
{
tmp = matchArr[2];
ret = tmp.slice(1, tmp.length - 1) + "()";
}
return ret;
}
}
It throws as Error() and then gets the function name from the stack trace.
Try vary the '2' in matchArr[2] when using wrappers.

Answer 2

caller is a non-standard extension to JavaScript (that is, many browsers have it but it's not part of the EcmaScript standard) and not implemented in Apps Script.

Answer 3

I made a function to get the call stack based on jgrotius's answer:
function getCallStack()
{
var returnValue = "";
var framePattern = /\sat (.+?):(\d+) \((.+?)\)/;
try
{
throw new Error('');
}
catch (e)
{
returnValue = e.stack
.split('\n')
.filter(function(frame, index) {
return !frame.isBlank() && index > 0;
})
// at app/lib/debug:21 (getCaller)
.map(function(frame) {
var parts = frame.match(framePattern);
return {
file: parts[1],
line: parseInt(parts[2]),
func: parts[3]
};
});
}
return returnValue;
}

Answer 4

This is my updated version of the other two proposed solutions:
const getStacktrace = () => {
try {
throw new Error('')
} catch (exception) {
// example: at getStacktrace (helper:6:11)
const regex = /\sat (.+?) \((.+?):(\d+):(\d+)\)/
return exception
.stack
.split('\n')
.slice(1, -1)
.filter((frame, index) => {
return frame && index > 0
})
.map((frame) => {
const parts = frame.match(regex)
return {
function: parts[1],
file: parts[2],
line: parseInt(parts[3]),
column: parseInt(parts[4])
}
})
}
}
P.S.: please not that the regex has changed and also we are ignoring the first element of the stacktrace, since it is the getStacktrace function itself.