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//! This module implements the backing representation of runtime
//! values in the Nix language.
use std::fmt::Display;
use std::rc::Rc;
mod attrs;
mod string;
use crate::errors::{Error, EvalResult};
use attrs::NixAttrs;
use string::NixString;
#[derive(Clone, Debug, PartialEq)]
pub enum Value {
Null,
Bool(bool),
Integer(i64),
Float(f64),
String(NixString),
Attrs(Rc<NixAttrs>),
}
impl Value {
pub fn is_number(&self) -> bool {
match self {
Value::Integer(_) => true,
Value::Float(_) => true,
_ => false,
}
}
pub fn type_of(&self) -> &'static str {
match self {
Value::Null => "null",
Value::Bool(_) => "bool",
Value::Integer(_) => "int",
Value::Float(_) => "float",
Value::String(_) => "string",
Value::Attrs(_) => "set",
}
}
pub fn as_bool(self) -> EvalResult<bool> {
match self {
Value::Bool(b) => Ok(b),
other => Err(Error::TypeError {
expected: "bool",
actual: other.type_of(),
}),
}
}
}
impl Display for Value {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Value::Null => f.write_str("null"),
Value::Bool(true) => f.write_str("true"),
Value::Bool(false) => f.write_str("false"),
Value::Integer(num) => f.write_fmt(format_args!("{}", num)),
Value::Float(num) => f.write_fmt(format_args!("{}", num)),
Value::String(s) => s.fmt(f),
Value::Attrs(attrs) => attrs.fmt(f),
}
}
}
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