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use crate::namespace::Namespace;
use crate::rules::Rule;
use serde::{Deserialize, Serialize};
use std::fmt::Debug;
use std::mem;
#[derive(Debug, Serialize, Deserialize)]
pub(crate) enum Node {
Object {
id: String,
children: Option<(usize, usize)>, // start + end tuple
rules: Option<Vec<Box<dyn Rule>>>,
},
Array {
index: usize,
id: String,
children: Option<(usize, usize)>, // start + end tuple
rules: Option<Vec<Box<dyn Rule>>>,
},
}
#[derive(Debug, Serialize, Deserialize)]
pub(crate) struct Arena {
pub(crate) tree: Vec<Node>,
}
impl Default for Arena {
fn default() -> Self {
Arena {
tree: vec![Node::Object {
id: String::from(""),
children: None,
rules: None,
}],
}
}
}
impl Arena {
// TODO: investigate using Option for namespace below
#[inline]
pub fn add<R>(&mut self, namespace: &[Namespace], rule: R)
where
R: Rule + Debug + 'static,
{
// when top level there will be no namespaces
let mut n = 0;
'outer: for ns in namespace {
// TODO: validate the children's namespace type matches the Namespace type
match self.tree.get(n).unwrap() {
Node::Object { children, .. } => {
if let Some((start, end)) = children.as_ref() {
for idx in *start..=*end {
match self.tree.get(idx).unwrap() {
Node::Object { id, .. } => {
if id == ns.id() && ns.is_object() {
n = idx;
continue 'outer;
}
}
Node::Array { index, id, .. } => {
if id == ns.id()
&& ns.is_array()
&& index == ns.as_array().unwrap().1
{
n = idx;
continue 'outer;
}
}
}
}
let parent_idx = Some(n);
n = end + 1;
match ns {
Namespace::Object { id } => {
let new_node = Node::Object {
id: id.clone(),
children: None,
rules: None,
};
self.reindex(parent_idx, n, new_node);
}
Namespace::Array { id, index } => {
let new_node = Node::Array {
index: *index,
id: id.clone(),
children: None,
rules: None,
};
self.reindex(parent_idx, n, new_node);
}
}
continue 'outer;
}
let parent_idx = Some(n);
n = self.tree.len();
match ns {
Namespace::Object { id } => {
let new_node = Node::Object {
id: id.clone(),
children: None,
rules: None,
};
self.reindex(parent_idx, n, new_node);
}
Namespace::Array { id, index } => {
let new_node = Node::Array {
index: *index,
id: id.clone(),
children: None,
rules: None,
};
self.reindex(parent_idx, n, new_node);
}
}
}
Node::Array {
// never be Node::Array for the root of the tree
children,
..
} => {
if let Some((start, end)) = children.as_ref() {
for idx in *start..=*end {
match self.tree.get(idx).unwrap() {
Node::Object { id, .. } => {
if id == ns.id() && ns.is_object() {
n = idx;
continue 'outer;
}
}
Node::Array { index, id, .. } => {
if id == ns.id()
&& ns.is_array()
&& index == ns.as_array().unwrap().1
{
n = idx;
continue 'outer;
}
}
}
}
let parent_idx = Some(n);
n = end + 1;
match ns {
Namespace::Object { id } => {
let new_node = Node::Object {
id: id.clone(),
children: None,
rules: None,
};
self.reindex(parent_idx, n, new_node);
}
Namespace::Array { id, index } => {
let new_node = Node::Array {
index: *index,
id: id.clone(),
children: None,
rules: None,
};
self.reindex(parent_idx, n, new_node);
}
}
continue 'outer;
}
let parent_idx = Some(n);
n = self.tree.len();
match ns {
Namespace::Object { id } => {
let new_node = Node::Object {
id: id.clone(),
children: None,
rules: None,
};
self.reindex(parent_idx, n, new_node);
}
Namespace::Array { id, index } => {
let new_node = Node::Array {
index: *index,
id: id.clone(),
children: None,
rules: None,
};
self.reindex(parent_idx, n, new_node);
}
}
}
}
}
let boxed_rule = Box::new(rule);
let node = self.tree.get_mut(n).unwrap();
match node {
Node::Object { rules, .. } => match rules {
Some(v) => v.push(boxed_rule),
None => *rules = Some(vec![boxed_rule]),
},
Node::Array { rules, .. } => match rules {
Some(v) => v.push(boxed_rule),
None => *rules = Some(vec![boxed_rule]),
},
}
}
#[inline]
fn reindex(&mut self, parent_idx: Option<usize>, index: usize, mut node: Node) {
// loop over all nodes in tree
for i in 0..self.tree.len() {
// increase child count for any nodes that will be reindexed
match self.tree.get_mut(i).unwrap() {
Node::Object { children, .. } => {
if let Some((start, end)) = children {
if *start >= index {
*start += 1;
*end += 1;
}
}
}
Node::Array { children, .. } => {
if let Some((start, end)) = children {
if *start >= index {
*start += 1;
*end += 1;
}
}
}
}
// if we're at the new nodes insertion point start reindexing
if i >= index {
node = mem::replace(&mut self.tree[i], node);
}
}
self.tree.push(node);
// increase or set the parent nodes child count to it's new range.
if let Some(idx) = parent_idx {
match self.tree.get_mut(idx).unwrap() {
Node::Object { children, .. } => match children {
Some((_, end)) => {
*end += 1;
}
None => *children = Some((index, index)),
},
Node::Array { children, .. } => match children {
Some((_, end)) => {
*end += 1;
}
None => *children = Some((index, index)),
},
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::errors::Result;
use serde::{Deserialize, Serialize};
use serde_json::{Map, Value};
#[derive(Debug, Serialize, Deserialize)]
struct MyRule {}
#[typetag::serde]
impl Rule for MyRule {
fn apply(&self, from: &Value, _to: &mut Map<String, Value>) -> Result<()> {
dbg!(from);
Ok(())
}
}
#[derive(Debug, Serialize, Deserialize)]
struct MyRule2 {}
#[typetag::serde]
impl Rule for MyRule2 {
fn apply(&self, from: &Value, _to: &mut Map<String, Value>) -> Result<()> {
dbg!(from);
Ok(())
}
}
#[test]
fn test_simple() {
let rule = MyRule {};
let namespace = vec![];
let mut arena = Arena::default();
arena.add(&namespace, rule);
let rule2 = MyRule2 {};
arena.add(&namespace, rule2);
// add a nested value
let rule3 = MyRule {};
let embedded = vec![Namespace::Object {
id: String::from("embedded"),
}];
arena.add(&embedded, rule3);
// add a nested value
let rule4 = MyRule2 {};
arena.add(&embedded, rule4);
let rule5 = MyRule {};
let embedded = vec![Namespace::Object {
id: String::from("embedded2"),
}];
arena.add(&embedded, rule5);
let rule6 = MyRule {};
let embedded = vec![
Namespace::Object {
id: String::from("embedded"),
},
Namespace::Object {
id: String::from("injected-child"),
},
];
arena.add(&embedded, rule6);
let rule7 = MyRule {};
let embedded = vec![
Namespace::Object {
id: String::from("embedded"),
},
Namespace::Object {
id: String::from("injected-child2"),
},
];
arena.add(&embedded, rule7);
let rule8 = MyRule {};
let embedded = vec![
Namespace::Object {
id: String::from("embedded2"),
},
Namespace::Object {
id: String::from("embedded2-injected-child"),
},
];
arena.add(&embedded, rule8);
let rule9 = MyRule {};
let embedded = vec![
Namespace::Object {
id: String::from("embedded"),
},
Namespace::Object {
id: String::from("injected-child3"),
},
];
arena.add(&embedded, rule9);
let rule10 = MyRule {};
let embedded = vec![
Namespace::Object {
id: String::from("embedded2"),
},
Namespace::Object {
id: String::from("embedded2-injected-child2"),
},
];
arena.add(&embedded, rule10);
// add a nested value
let rule11 = MyRule {};
let embedded = vec![Namespace::Object {
id: String::from("injected-embedded-after"),
}];
arena.add(&embedded, rule11);
let tree = vec![
Node::Object {
id: "".to_string(),
children: Some((1, 3)),
rules: Some(vec![Box::new(MyRule {}), Box::new(MyRule2 {})]),
},
Node::Object {
id: "embedded".to_string(),
children: Some((4, 6)),
rules: Some(vec![Box::new(MyRule {}), Box::new(MyRule2 {})]),
},
Node::Object {
id: "embedded2".to_string(),
children: Some((7, 8)),
rules: Some(vec![Box::new(MyRule {})]),
},
Node::Object {
id: "injected-embedded-after".to_string(),
children: None,
rules: Some(vec![Box::new(MyRule {})]),
},
Node::Object {
id: "injected-child".to_string(),
children: None,
rules: Some(vec![Box::new(MyRule {})]),
},
Node::Object {
id: "injected-child2".to_string(),
children: None,
rules: Some(vec![Box::new(MyRule {})]),
},
Node::Object {
id: "injected-child3".to_string(),
children: None,
rules: Some(vec![Box::new(MyRule {})]),
},
Node::Object {
id: "embedded2-injected-child".to_string(),
children: None,
rules: Some(vec![Box::new(MyRule {})]),
},
Node::Object {
id: "embedded2-injected-child2".to_string(),
children: None,
rules: Some(vec![Box::new(MyRule {})]),
},
];
let expected = Arena { tree };
assert_eq!(format!("{:?}", expected), format!("{:?}", arena));
}
}