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use crate::edn::{Edn, Map};
use std::fmt;
use std::ops;
pub trait Index: private::Sealed {
#[doc(hidden)]
fn index_into<'v>(&self, v: &'v Edn) -> Option<&'v Edn>;
#[doc(hidden)]
fn index_into_mut<'v>(&self, v: &'v mut Edn) -> Option<&'v mut Edn>;
#[doc(hidden)]
fn index_or_insert<'v>(&self, v: &'v mut Edn) -> &'v mut Edn;
}
impl Index for usize {
fn index_into<'v>(&self, v: &'v Edn) -> Option<&'v Edn> {
match *v {
Edn::Vector(ref vec) => vec.0.get(*self),
Edn::List(ref vec) => vec.0.get(*self),
Edn::NamespacedMap(_, ref map) => map.0.get(&self.to_string()),
_ => None,
}
}
fn index_into_mut<'v>(&self, v: &'v mut Edn) -> Option<&'v mut Edn> {
match *v {
Edn::Vector(ref mut vec) => vec.0.get_mut(*self),
Edn::List(ref mut vec) => vec.0.get_mut(*self),
Edn::NamespacedMap(_, ref mut map) => map.0.get_mut(&self.to_string()),
_ => None,
}
}
fn index_or_insert<'v>(&self, v: &'v mut Edn) -> &'v mut Edn {
match *v {
Edn::Vector(ref mut vec) => {
let len = vec.0.len();
vec.0.get_mut(*self).unwrap_or_else(|| {
panic!(
"cannot access index {} of EDN array of length {}",
self, len
)
})
}
Edn::NamespacedMap(_, ref mut map) => map.0.entry(self.to_string()).or_insert(Edn::Nil),
_ => panic!("cannot access index {} of EDN {}", self, Type(v)),
}
}
}
impl Index for str {
fn index_into<'v>(&self, v: &'v Edn) -> Option<&'v Edn> {
match *v {
Edn::Map(ref map) => map.0.get(self),
Edn::NamespacedMap(_, ref map) => map.0.get(self),
_ => None,
}
}
fn index_into_mut<'v>(&self, v: &'v mut Edn) -> Option<&'v mut Edn> {
match *v {
Edn::Map(ref mut map) => map.0.get_mut(self),
Edn::NamespacedMap(_, ref mut map) => map.0.get_mut(self),
_ => None,
}
}
fn index_or_insert<'v>(&self, v: &'v mut Edn) -> &'v mut Edn {
if let Edn::Nil = *v {
*v = Edn::Map(Map::new(std::collections::BTreeMap::new()));
}
match *v {
Edn::Map(ref mut map) => map.0.entry(self.to_owned()).or_insert(Edn::Nil),
Edn::NamespacedMap(_, ref mut map) => map.0.entry(self.to_owned()).or_insert(Edn::Nil),
_ => panic!("cannot access key {:?} in EDN {}", self, Type(v)),
}
}
}
impl Index for String {
fn index_into<'v>(&self, v: &'v Edn) -> Option<&'v Edn> {
self[..].index_into(v)
}
fn index_into_mut<'v>(&self, v: &'v mut Edn) -> Option<&'v mut Edn> {
self[..].index_into_mut(v)
}
fn index_or_insert<'v>(&self, v: &'v mut Edn) -> &'v mut Edn {
self[..].index_or_insert(v)
}
}
impl Index for Edn {
fn index_into<'v>(&self, v: &'v Edn) -> Option<&'v Edn> {
let key = self.to_string();
let index = self.to_uint();
match (v, index) {
(Edn::Map(ref map), _) => map.0.get(&key),
(Edn::NamespacedMap(_, ref map), _) => map.0.get(&key),
(Edn::List(_), Some(idx)) => idx.index_into(v),
(Edn::Vector(_), Some(idx)) => idx.index_into(v),
_ => None,
}
}
fn index_into_mut<'v>(&self, _: &'v mut Edn) -> Option<&'v mut Edn> {
panic!("index_into_mut not implemented for edn")
}
fn index_or_insert<'v>(&self, _: &'v mut Edn) -> &'v mut Edn {
panic!("index_or_insert not implemented for edn")
}
}
impl<'a, T: ?Sized> Index for &'a T
where
T: Index,
{
fn index_into<'v>(&self, v: &'v Edn) -> Option<&'v Edn> {
(**self).index_into(v)
}
fn index_into_mut<'v>(&self, v: &'v mut Edn) -> Option<&'v mut Edn> {
(**self).index_into_mut(v)
}
fn index_or_insert<'v>(&self, v: &'v mut Edn) -> &'v mut Edn {
(**self).index_or_insert(v)
}
}
mod private {
use crate::Edn;
pub trait Sealed {}
impl Sealed for usize {}
impl Sealed for str {}
impl Sealed for String {}
impl Sealed for Edn {}
impl<'a, T: ?Sized> Sealed for &'a T where T: Sealed {}
}
struct Type<'a>(&'a Edn);
impl<'a> fmt::Display for Type<'a> {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
match *self.0 {
Edn::Empty => formatter.write_str("empty"),
Edn::Nil => formatter.write_str("null"),
Edn::Bool(_) => formatter.write_str("boolean"),
Edn::Int(_) | Edn::UInt(_) => formatter.write_str("integer"),
Edn::Str(_) => formatter.write_str("string"),
Edn::Vector(_) => formatter.write_str("vector"),
Edn::Set(_) => formatter.write_str("set"),
Edn::List(_) => formatter.write_str("list"),
Edn::Map(_) => formatter.write_str("map"),
Edn::NamespacedMap(_, _) => formatter.write_str("namespaced-map"),
Edn::Key(_) => formatter.write_str("key"),
Edn::Char(_) => formatter.write_str("char"),
Edn::Symbol(_) => formatter.write_str("symbol"),
Edn::Double(_) => formatter.write_str("double"),
Edn::Inst(_) => formatter.write_str("inst"),
Edn::Uuid(_) => formatter.write_str("uuid"),
Edn::Rational(_) => formatter.write_str("rational"),
Edn::Tagged(_, _) => formatter.write_str("tagged-element"),
}
}
}
impl<I> ops::Index<I> for Edn
where
I: Index,
{
type Output = Edn;
fn index(&self, index: I) -> &Edn {
static NULL: Edn = Edn::Nil;
index.index_into(self).unwrap_or(&NULL)
}
}
impl<I> ops::IndexMut<I> for Edn
where
I: Index,
{
fn index_mut(&mut self, index: I) -> &mut Edn {
index.index_or_insert(self)
}
}
