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use std::ops;
use crate::document::Document;
use crate::key::Key;
use crate::table::TableKeyValue;
use crate::{value, InlineTable, InternalString, Item, Table, Value};
// copied from
// https://github.com/serde-rs/json/blob/master/src/value/index.rs
pub trait Index: crate::private::Sealed {
#[doc(hidden)]
fn index<'v>(&self, val: &'v Item) -> Option<&'v Item>;
#[doc(hidden)]
fn index_mut<'v>(&self, val: &'v mut Item) -> Option<&'v mut Item>;
}
impl Index for usize {
fn index<'v>(&self, v: &'v Item) -> Option<&'v Item> {
match *v {
Item::ArrayOfTables(ref aot) => aot.values.get(*self),
Item::Value(ref a) if a.is_array() => a.as_array().and_then(|a| a.values.get(*self)),
_ => None,
}
}
fn index_mut<'v>(&self, v: &'v mut Item) -> Option<&'v mut Item> {
match *v {
Item::ArrayOfTables(ref mut vec) => vec.values.get_mut(*self),
Item::Value(ref mut a) => a.as_array_mut().and_then(|a| a.values.get_mut(*self)),
_ => None,
}
}
}
impl Index for str {
fn index<'v>(&self, v: &'v Item) -> Option<&'v Item> {
match *v {
Item::Table(ref t) => t.get(self),
Item::Value(ref v) => v
.as_inline_table()
.and_then(|t| t.items.get(self))
.and_then(|kv| {
if !kv.value.is_none() {
Some(&kv.value)
} else {
None
}
}),
_ => None,
}
}
fn index_mut<'v>(&self, v: &'v mut Item) -> Option<&'v mut Item> {
if let Item::None = *v {
let mut t = InlineTable::default();
t.items.insert(
InternalString::from(self),
TableKeyValue::new(Key::new(self), Item::None),
);
*v = value(Value::InlineTable(t));
}
match *v {
Item::Table(ref mut t) => Some(t.entry(self).or_insert(Item::None)),
Item::Value(ref mut v) => v.as_inline_table_mut().map(|t| {
&mut t
.items
.entry(InternalString::from(self))
.or_insert_with(|| TableKeyValue::new(Key::new(self), Item::None))
.value
}),
_ => None,
}
}
}
impl Index for String {
fn index<'v>(&self, v: &'v Item) -> Option<&'v Item> {
self[..].index(v)
}
fn index_mut<'v>(&self, v: &'v mut Item) -> Option<&'v mut Item> {
self[..].index_mut(v)
}
}
impl<'a, T: ?Sized> Index for &'a T
where
T: Index,
{
fn index<'v>(&self, v: &'v Item) -> Option<&'v Item> {
(**self).index(v)
}
fn index_mut<'v>(&self, v: &'v mut Item) -> Option<&'v mut Item> {
(**self).index_mut(v)
}
}
impl<I> ops::Index<I> for Item
where
I: Index,
{
type Output = Item;
fn index(&self, index: I) -> &Item {
index.index(self).expect("index not found")
}
}
impl<I> ops::IndexMut<I> for Item
where
I: Index,
{
fn index_mut(&mut self, index: I) -> &mut Item {
index.index_mut(self).expect("index not found")
}
}
impl<'s> ops::Index<&'s str> for Table {
type Output = Item;
fn index(&self, key: &'s str) -> &Item {
self.get(key).expect("index not found")
}
}
impl<'s> ops::IndexMut<&'s str> for Table {
fn index_mut(&mut self, key: &'s str) -> &mut Item {
self.entry(key).or_insert(Item::None)
}
}
impl<'s> ops::Index<&'s str> for InlineTable {
type Output = Value;
fn index(&self, key: &'s str) -> &Value {
self.get(key).expect("index not found")
}
}
impl<'s> ops::IndexMut<&'s str> for InlineTable {
fn index_mut(&mut self, key: &'s str) -> &mut Value {
self.get_mut(key).expect("index not found")
}
}
impl<'s> ops::Index<&'s str> for Document {
type Output = Item;
fn index(&self, key: &'s str) -> &Item {
self.root.index(key)
}
}
impl<'s> ops::IndexMut<&'s str> for Document {
fn index_mut(&mut self, key: &'s str) -> &mut Item {
self.root.index_mut(key)
}
}
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