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use super::Key;
use crate::traitdef::{Mutable, Value};
use serde_json::{map, Map, Value as SerdeJson};
use std::mem;
impl Value for SerdeJson {
type Key = Key;
type Item = SerdeJson;
fn items<'a>(&'a self) -> Option<Box<dyn Iterator<Item = (Self::Key, &'a Self::Item)> + 'a>> {
match *self {
SerdeJson::String(_) | SerdeJson::Number(_) | SerdeJson::Bool(_) | SerdeJson::Null => {
None
}
SerdeJson::Array(ref inner) => Some(Box::new(
inner.iter().enumerate().map(|(i, v)| (Key::Index(i), v)),
)),
SerdeJson::Object(ref inner) => Some(Box::new(
inner.iter().map(|(s, v)| (Key::String(s.clone()), v)),
)),
}
}
}
impl Mutable for SerdeJson {
type Key = Key;
type Item = SerdeJson;
fn set(&mut self, keys: &[Self::Key], v: &Self::Item) {
if keys.is_empty() {
*self = v.clone();
} else {
let mut c = self;
let last_key_index = keys.len() - 1;
let object_or_value = |index| {
if index == last_key_index {
v.clone()
} else {
SerdeJson::Object(Map::new())
}
};
fn runup_array_or_value<'a>(
array: &'a mut Vec<SerdeJson>,
target_index: usize,
key_index: usize,
last_key_index: usize,
v: &SerdeJson,
) -> &'a mut SerdeJson {
for _ in array.len()..target_index {
array.push(SerdeJson::Null);
}
let value = if key_index == last_key_index {
v.clone()
} else {
SerdeJson::Null
};
if target_index == array.len() {
array.push(value);
} else {
array[target_index] = value;
}
&mut array[target_index]
};
for (i, k) in keys.iter().enumerate() {
c = match *k {
Key::String(ref k) => match { c } {
&mut SerdeJson::Object(ref mut obj) => match obj.entry(k.clone()) {
map::Entry::Vacant(e) => e.insert(object_or_value(i)),
map::Entry::Occupied(e) => {
if i == last_key_index {
*e.into_mut() = v.clone();
return;
} else {
e.into_mut()
}
}
},
c @ &mut SerdeJson::String(_)
| c @ &mut SerdeJson::Number(_)
| c @ &mut SerdeJson::Bool(_)
| c @ &mut SerdeJson::Null
| c @ &mut SerdeJson::Array(_) => {
drop(mem::replace(
c,
SerdeJson::Object({
let mut o = Map::new();
o.insert(k.clone(), object_or_value(i));
o
}),
));
if i == last_key_index {
return;
}
match c {
SerdeJson::Object(ref mut obj) => {
obj.get_mut(k).expect("previous insertion")
}
_ => unreachable!(),
}
}
},
Key::Index(idx) => match { c } {
&mut SerdeJson::Array(ref mut a) => {
runup_array_or_value(a, idx, i, last_key_index, v)
}
c @ &mut SerdeJson::String(_)
| c @ &mut SerdeJson::Number(_)
| c @ &mut SerdeJson::Bool(_)
| c @ &mut SerdeJson::Null
| c @ &mut SerdeJson::Object(_) => {
let mut a = Vec::new();
runup_array_or_value(&mut a, idx, i, last_key_index, v);
drop(mem::replace(c, SerdeJson::Array(a)));
if i == last_key_index {
return;
}
match c {
SerdeJson::Array(ref mut a) => {
a.get_mut(idx).expect("previous insertion")
}
_ => unreachable!(),
}
}
},
}
}
}
}
fn remove(&mut self, keys: &[Self::Key]) {
let mut c = self;
let last_key_index = keys.len().checked_sub(1).expect("at least one key");
for (i, k) in keys.iter().enumerate() {
c = match *k {
Key::String(ref k) => match { c } {
SerdeJson::Object(ref mut obj) => {
if i == last_key_index {
obj.remove(k);
return;
} else {
match obj.get_mut(k) {
Some(json) => json,
None => return,
}
}
}
_ => return,
},
Key::Index(idx) => match { c } {
SerdeJson::Array(ref mut a) => {
if i == last_key_index {
a.remove(idx);
return;
} else {
match a.get_mut(idx) {
Some(json) => json,
None => return,
}
}
}
_ => return,
},
}
}
}
}