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_value_set(vm: &mut VM) -> Result<&mut VM, Error> {
    if vm.stack.current_stack_len() < 3 {
        bail!("Stack is too shallow for inline set");
    }
    match vm.stack.pull() {
        Some(d_val) => {
            match vm.stack.pull() {
                Some(tag_name_val) => {
                    match vm.stack.pull() {
                        Some(mut value) => {
                            match value.type_of() {
                                VALUEMAP => {
                                    vm.stack.push(value.set_vmap(tag_name_val, d_val));
                                }
                                _ => {
                                    let key_name = match tag_name_val.cast_string() {
                                        Ok(key_name) => key_name,
                                        Err(err) => {
                                            bail!("SET key expected to be string: {}", err);
                                        }
                                    };
                                    vm.stack.push(value.set(key_name, d_val));
                                }
                            }
                        }
                        None => {
                            bail!("SET returns: NO DATA #3");
                        }
                    }
                }
                None => {
                    bail!("SET returns: NO DATA #2");
                }
            }
        }
        None => {
            bail!("SET returns: NO DATA #1");
        }
    }
    Ok(vm)
}

pub fn stdlib_value_get(vm: &mut VM) -> Result<&mut VM, Error> {
    if vm.stack.current_stack_len() < 2 {
        bail!("Stack is too shallow for inline get");
    }
    match vm.stack.pull() {
        Some(tag_name_val) => {
            let key_name = match tag_name_val.cast_string() {
                Ok(key_name) => key_name,
                Err(err) => {
                    bail!("GET key expected to be string: {}", err);
                }
            };
            match vm.stack.pull() {
                Some(value) => {
                    match value.get(key_name) {
                        Ok(d_val) => {
                            vm.stack.push(d_val);
                        }
                        Err(err) => {
                            bail!("GET returns error: {}", err);
                        }
                    }
                }
                None => {
                    bail!("GET returns: NO DATA #2");
                }
            }
        }
        None => {
            bail!("GET returns: NO DATA #1");
        }
    }
    Ok(vm)
}

pub fn stdlib_value_has_key(vm: &mut VM) -> Result<&mut VM, Error> {
    if vm.stack.current_stack_len() < 2 {
        bail!("Stack is too shallow for inline get");
    }
    match vm.stack.pull() {
        Some(tag_name_val) => {
            let key_name = match tag_name_val.cast_string() {
                Ok(key_name) => key_name,
                Err(err) => {
                    bail!("GET key expected to be string: {}", err);
                }
            };
            match vm.stack.pull() {
                Some(value) => {
                    match value.has_key(key_name) {
                        Ok(d_val) => {
                            vm.stack.push(value);
                            vm.stack.push(d_val);
                        }
                        Err(err) => {
                            bail!("HAS_KEY returns error: {}", err);
                        }
                    }
                }
                None => {
                    bail!("HAS_KEY returns: NO DATA #2");
                }
            }
        }
        None => {
            bail!("HAS_KEY returns: NO DATA #1");
        }
    }
    Ok(vm)
}

pub fn init_stdlib(vm: &mut VM) {
    let _ = vm.register_inline("set".to_string(), stdlib_value_set);
    let _ = vm.register_inline("get".to_string(), stdlib_value_get);
    let _ = vm.register_inline("?key".to_string(), stdlib_value_has_key);
}