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use super::types::Range;
use std::collections::HashMap;
#[derive(Debug)]
pub enum EntryType {
JSONObject(HashMap<String, (usize, usize)>), // key, value
JSONArray(Vec<usize>),
String(String),
Int(i64),
Float(f64),
Bool(bool),
Null,
}
#[derive(Debug)]
pub struct Entry {
pub key: Option<usize>,
pub range: Range,
pub entry_type: EntryType,
}
#[derive(Debug)]
pub struct Key {
pub name: String,
pub range: Range,
}
#[derive(Debug)]
pub struct Tree {
pub entries: Vec<Entry>,
pub keys: Vec<Key>,
}
#[derive(Debug, Clone)]
pub enum PathType<'input> {
Object(&'input str),
Array(usize),
Wildcard,
RecursiveWildcard,
}
impl Tree {
fn handle_path(&self, entries: &[&Entry], path: &str) -> Vec<&Entry> {
entries
.iter()
.filter_map(|entry| {
if let EntryType::JSONObject(entries) = &entry.entry_type {
if let Some((_, value)) = entries.get(path) {
return self.entries.get(*value);
}
}
None
})
.collect()
}
fn handle_array(&self, entries: &[&Entry], pos: usize) -> Vec<&Entry> {
entries
.iter()
.filter_map(|entry| {
if let EntryType::JSONArray(entries) = &entry.entry_type {
if let Some(value) = entries.get(pos) {
return self.entries.get(*value);
}
}
None
})
.collect()
}
fn handle_wildcard(&self, entries: &[&Entry]) -> Vec<&Entry> {
entries
.iter()
.filter_map(|entry| {
if let EntryType::JSONObject(hash) = &entry.entry_type {
return Some(
hash.iter()
.filter_map(|(_, (_, entry))| self.entries.get(*entry))
.collect(),
);
}
if let EntryType::JSONArray(array) = &entry.entry_type {
return Some(
array
.iter()
.filter_map(|entry| self.entries.get(*entry))
.collect(),
);
}
None
})
.collect::<Vec<Vec<&Entry>>>()
.into_iter()
.flatten()
.collect::<Vec<&Entry>>()
}
fn handle_recursive_wildcard(&self, entries: &[&Entry]) -> Vec<&Entry> {
entries
.iter()
.filter_map(|entry| {
if let EntryType::JSONObject(hash) = &entry.entry_type {
let values: Vec<&Entry> = hash
.iter()
.filter_map(|(_, (_, entry))| self.entries.get(*entry))
.collect();
let next = self.handle_recursive_wildcard(&values);
return Some([&values[..], &next[..]].concat());
}
if let EntryType::JSONArray(array) = &entry.entry_type {
let values: Vec<&Entry> = array
.iter()
.filter_map(|entry| self.entries.get(*entry))
.collect();
let next = self.handle_recursive_wildcard(&values);
return Some([&values[..], &next[..]].concat());
}
None
})
.collect::<Vec<Vec<&Entry>>>()
.into_iter()
.flatten()
.collect::<Vec<&Entry>>()
}
/// Get values at a path. Wildcard and recursive wildcard available.
///
/// **Example**
/// ```
/// let text = "{ \"a\": { \"b\": ["c"] } }";
/// match parse_json(&text) {
/// Ok(tree) => {
/// let keys = tree.values_at(&[
/// PathType::Object("a"),
/// PathType::Object("b"),
/// PathType::Array(0),
/// ]);
/// },
/// Err(e) => println!("{:?}", e),
/// };
/// ```
pub fn value_at(&self, path: &[PathType]) -> Vec<&Entry> {
let mut vec = vec![];
if let Some(first) = self.entries.last() {
vec.push(first);
return path.iter().fold(vec, |last, path| match path {
PathType::Object(path) => self.handle_path(&last, path),
PathType::Array(pos) => self.handle_array(&last, *pos),
PathType::Wildcard => self.handle_wildcard(&last),
PathType::RecursiveWildcard => {
[&last[..], &self.handle_recursive_wildcard(&last)[..]].concat()
}
});
}
vec
}
/// Get keys at a path. Wildcard and recursive wildcard available.
///
/// **Example**
/// ```
/// let text = "{ \"a\": { \"b\": ["c"] } }";
/// match parse_json(&text) {
/// Ok(tree) => {
/// let keys = tree.keys_at(&[
/// PathType::Object("a"),
/// PathType::Object("b"),
/// PathType::Array(0),
/// ]);
/// },
/// Err(e) => println!("{:?}", e),
/// };
/// ```
pub fn keys_at(&self, path: &[PathType]) -> Vec<&Key> {
self.value_at(path)
.iter()
.filter_map(|entry| {
if let EntryType::JSONObject(hash) = &entry.entry_type {
return Some(
hash.iter()
.filter_map(|(_, (key, _))| self.keys.get(*key))
.collect(),
);
}
None
})
.collect::<Vec<Vec<&Key>>>()
.into_iter()
.flatten()
.collect::<Vec<&Key>>()
}
}