harn-vm 0.9.8

Async bytecode virtual machine for the Harn programming language
Documentation 
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use std::path::PathBuf;

use crate::value::VmValue;

pub(super) fn optional_string_field(dict: &crate::value::DictMap, key: &str) -> Option<String> {
    dict.get(key)
        .and_then(value_as_string)
        .filter(|value| !value.is_empty())
}

pub(super) fn value_as_string(value: &VmValue) -> Option<String> {
    match value {
        VmValue::Nil => None,
        VmValue::String(s) => Some(s.to_string()),
        other => Some(other.display()),
    }
}

pub(super) fn string_list_value(values: Vec<String>) -> VmValue {
    VmValue::List(std::sync::Arc::new(
        values.into_iter().map(VmValue::string).collect(),
    ))
}

pub(super) fn value_as_bool(value: &VmValue) -> Option<bool> {
    match value {
        VmValue::Bool(flag) => Some(*flag),
        _ => None,
    }
}

pub(super) fn read_text_if_exists(path: PathBuf) -> Option<String> {
    std::fs::read_to_string(path).ok()
}