Enums in OpenSCAD

Our enum type ServerState has an underlying int type. The possible values for ServerState are defined as constants. By implementing the fmt.Stringer interface, values of ServerState can be printed out or converted to strings. Transition emulates a state transition for a server; it takes the existing state and returns a new state.

Here is the equivalent code in OpenSCAD:

// Define the ServerState as a list of constants
enum ServerState = [StateIdle, StateConnected, StateError, StateRetrying];

// Map the state names to their corresponding string representations
stateName = [
    "idle",
    "connected",
    "error",
    "retrying"
];

// Function to get the string representation of a state
function stateToString(state) =
    stateName[state];

// Function to transition between states
function transition(state) =
    state == 0 ? 1 :  // StateIdle to StateConnected
    state == 1 ? 0 :  // StateConnected to StateIdle
    state == 3 ? 0 :  // StateRetrying to StateIdle
    state == 2 ? 2 :  // StateError remains StateError
    -1;  // unknown state

// Main function to perform transitions and print the state names
module main() {
    ns = transition(0);  // StateIdle
    echo(stateToString(ns));

    ns2 = transition(ns);
    echo(stateToString(ns2));
}

// Execute the main function
main();

To run the program, ensure you have OpenSCAD installed and execute the script using OpenSCAD’s GUI or command line.

$ openscad -q -o enums_output.txt enums.scad

The expected output will be:

ECHO: "connected"
ECHO: "idle"

Note: The transition function is designed to handle state transitions similarly to the original example. Unknown states will return -1. This example demonstrates basic state transitions and string outputs using OpenSCAD’s functional programming capabilities.

Interfaces in OpenSCAD

Struct Embedding in OpenSCAD

Learn X By Example

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Enums in OpenSCAD