rust_multistackvm 0.38.0

Stack-based virtual machine on top of rust_multistack crate
Documentation 
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use crate::multistackvm::VM;
use rust_dynamic::types::*;
use easy_error::{Error, bail};

pub fn stdlib_lambda_register(vm: &mut VM) -> Result<&mut VM, Error> {
    if vm.stack.current_stack_len() < 2 {
        bail!("Stack is too shallow for inline register");
    }
    match vm.stack.pull() {
        Some(lambda_value) => {
            match vm.stack.pull() {
                Some(name_value) => {
                    match name_value.cast_string() {
                        Ok(name) => {
                            match lambda_value.type_of() {
                                LAMBDA => {
                                    return vm.register_lambda(name, lambda_value);
                                }
                                CLASS => {
                                    return vm.register_class(name, lambda_value);
                                }
                                _ => bail!("REGISTER expecting CLASS or LAMBDA")
                            }
                        }
                        Err(err) => {
                            bail!("REGISTER expecting lambda name to be string: {}", err);
                        }
                    }
                }
                None => {
                    bail!("REGISTER returns: NO DATA #2");
                }
            }
        }
        None => {
            bail!("REGISTER returns: NO DATA #1");
        }
    }
}

pub fn stdlib_lambda_unregister(vm: &mut VM) -> Result<&mut VM, Error> {
    if vm.stack.current_stack_len() < 1 {
        bail!("Stack is too shallow for inline unregister");
    }

    match vm.stack.pull() {
        Some(name_value) => {
            match name_value.cast_string() {
                Ok(name) => {
                    return vm.unregister_lambda(name);
                }
                Err(err) => {
                    bail!("UNREGISTER expecting lanbda name to be string: {}", err);
                }
            }
        }
        None => {
            bail!("UNREGISTER returns: NO DATA #1");
        }
    }
}

pub fn stdlib_class_unregister(vm: &mut VM) -> Result<&mut VM, Error> {
    if vm.stack.current_stack_len() < 1 {
        bail!("Stack is too shallow for inline unregister.class");
    }

    match vm.stack.pull() {
        Some(name_value) => {
            match name_value.cast_string() {
                Ok(name) => {
                    return vm.unregister_class(name);
                }
                Err(err) => {
                    bail!("UNREGISTER.CLASS expecting lanbda name to be string: {}", err);
                }
            }
        }
        None => {
            bail!("UNREGISTER.CLASS returns: NO DATA #1");
        }
    }
}



pub fn init_stdlib(vm: &mut VM) {
    let _ = vm.register_inline("register".to_string(), stdlib_lambda_register);
    let _ = vm.register_inline("unregister".to_string(), stdlib_lambda_unregister);
    let _ = vm.register_inline("unregister".to_string(), stdlib_class_unregister);
}