Recover in OpenSCAD

OpenSCAD does not have built-in support for exception handling or panic recovery like Go does. However, we can simulate a similar concept using functions and conditional statements. Here’s an example that demonstrates a similar idea:

// This function simulates a panic
function mayPanic() = assert(false, "a problem");

// This function simulates recover
function recover(result) =
    is_undef(result) ? undef : str("Recovered. Error:\n", result);

// Main function
function main() =
    let(
        result = mayPanic()
    )
    recover(result) == undef
        ? echo("After mayPanic()")
        : echo(recover(result));

// Execute the main function
main();

In OpenSCAD, we don’t have true exception handling or a panic mechanism. Instead, we’re using functions to simulate similar behavior:

1. The mayPanic() function uses assert() to simulate a panic. When the assertion fails, it will stop the execution and print an error message.

2. The recover() function checks if a result is undefined (which would be the case if mayPanic() didn’t assert). If it’s undefined, it returns undef, otherwise it returns an error message string.

3. In the main() function, we call mayPanic() and store its result. We then use a ternary operator to check if the recover function returns undef. If it does, we echo “After mayPanic()”, otherwise we echo the recovered error message.

To run this script:

1. Save it to a file with a .scad extension, for example recover.scad.
2. Open it in the OpenSCAD application or run it from the command line.

When you run this script, you should see output similar to this in the OpenSCAD console:

ECHO: "Recovered. Error:
a problem"

This output indicates that our simulated “panic” was caught and “recovered” from, mimicking the behavior of the original Go code as closely as possible within the constraints of OpenSCAD.

Remember that this is a simulation of the concept, not a true implementation of panic and recover. OpenSCAD’s assert() function will still halt execution when it fails, unlike Go’s panic which can be recovered from.