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//! This module implements Nix lists.
use std::ops::Deref;
use std::rc::Rc;
use crate::errors::ErrorKind;
use crate::vm::VM;
use super::thunk::ThunkSet;
use super::TotalDisplay;
use super::Value;
#[repr(transparent)]
#[derive(Clone, Debug)]
pub struct NixList(Rc<Vec<Value>>);
impl TotalDisplay for NixList {
fn total_fmt(&self, f: &mut std::fmt::Formatter<'_>, set: &mut ThunkSet) -> std::fmt::Result {
f.write_str("[ ")?;
for v in self.0.as_ref() {
v.total_fmt(f, set)?;
f.write_str(" ")?;
}
f.write_str("]")
}
}
impl From<Vec<Value>> for NixList {
fn from(vs: Vec<Value>) -> Self {
Self(Rc::new(vs))
}
}
#[cfg(feature = "arbitrary")]
mod arbitrary {
use proptest::{
prelude::{any_with, Arbitrary},
strategy::{BoxedStrategy, Strategy},
};
use super::*;
impl Arbitrary for NixList {
type Parameters = <Vec<Value> as Arbitrary>::Parameters;
type Strategy = BoxedStrategy<Self>;
fn arbitrary_with(args: Self::Parameters) -> Self::Strategy {
any_with::<Rc<Vec<Value>>>(args).prop_map(Self).boxed()
}
}
}
impl NixList {
pub fn new() -> Self {
Self(Rc::new(vec![]))
}
pub fn len(&self) -> usize {
self.0.len()
}
pub fn get(&self, i: usize) -> Option<&Value> {
self.0.get(i)
}
pub fn construct(count: usize, stack_slice: Vec<Value>) -> Self {
debug_assert!(
count == stack_slice.len(),
"NixList::construct called with count == {}, but slice.len() == {}",
count,
stack_slice.len(),
);
NixList(Rc::new(stack_slice))
}
pub fn iter(&self) -> std::slice::Iter<Value> {
self.0.iter()
}
pub fn ptr_eq(&self, other: &Self) -> bool {
Rc::ptr_eq(&self.0, &other.0)
}
/// Compare `self` against `other` for equality using Nix equality semantics
pub fn nix_eq(&self, other: &Self, vm: &mut VM) -> Result<bool, ErrorKind> {
if self.ptr_eq(other) {
return Ok(true);
}
if self.len() != other.len() {
return Ok(false);
}
for (v1, v2) in self.iter().zip(other.iter()) {
if !v1.nix_eq(v2, vm)? {
return Ok(false);
}
}
Ok(true)
}
/// force each element of the list (shallowly), making it safe to call .get().value()
pub fn force_elements(&self, vm: &mut VM) -> Result<(), ErrorKind> {
self.iter().try_for_each(|v| v.force(vm).map(|_| ()))
}
pub fn into_vec(self) -> Vec<Value> {
crate::unwrap_or_clone_rc(self.0)
}
}
impl IntoIterator for NixList {
type Item = Value;
type IntoIter = std::vec::IntoIter<Value>;
fn into_iter(self) -> std::vec::IntoIter<Value> {
self.into_vec().into_iter()
}
}
impl<'a> IntoIterator for &'a NixList {
type Item = &'a Value;
type IntoIter = std::slice::Iter<'a, Value>;
fn into_iter(self) -> Self::IntoIter {
self.0.iter()
}
}
impl Deref for NixList {
type Target = Vec<Value>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
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