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use serde_json::Value;
use std::collections::HashSet;
pub(super) struct ValueWalker;
impl<'a> ValueWalker {
pub fn all_with_num(vec: &[&'a Value], tmp: &mut Vec<&'a Value>, index: f64) {
Self::walk(vec, tmp, &|v| if v.is_array() {
if let Some(item) = v.get(index as usize) {
Some(vec![item])
} else {
None
}
} else {
None
});
}
pub fn all_with_str(vec: &[&'a Value], tmp: &mut Vec<&'a Value>, key: &str, is_filter: bool) {
if is_filter {
Self::walk(vec, tmp, &|v| match v {
Value::Object(map) if map.contains_key(key) => Some(vec![v]),
_ => None,
});
} else {
Self::walk(vec, tmp, &|v| match v {
Value::Object(map) => match map.get(key) {
Some(v) => Some(vec![v]),
_ => None,
},
_ => None,
});
}
}
pub fn all(vec: &[&'a Value], tmp: &mut Vec<&'a Value>) {
Self::walk(vec, tmp, &|v| match v {
Value::Array(vec) => Some(vec.iter().collect()),
Value::Object(map) => {
let mut tmp = Vec::new();
for (_, v) in map {
tmp.push(v);
}
Some(tmp)
}
_ => None,
});
}
fn walk<F>(vec: &[&'a Value], tmp: &mut Vec<&'a Value>, fun: &F) where F: Fn(&Value) -> Option<Vec<&Value>> {
for v in vec {
Self::_walk(v, tmp, fun);
}
}
fn _walk<F>(v: &'a Value, tmp: &mut Vec<&'a Value>, fun: &F) where F: Fn(&Value) -> Option<Vec<&Value>> {
if let Some(mut ret) = fun(v) {
tmp.append(&mut ret);
}
match v {
Value::Array(vec) => {
for v in vec {
Self::_walk(v, tmp, fun);
}
}
Value::Object(map) => {
for (_, v) in map {
Self::_walk(&v, tmp, fun);
}
}
_ => {}
}
}
pub fn walk_dedup(v: &'a Value,
tmp: &mut Vec<&'a Value>,
key: &str,
visited: &mut HashSet<*const Value>, ) {
match v {
Value::Object(map) => {
if map.contains_key(key) {
let ptr = v as *const Value;
if !visited.contains(&ptr) {
visited.insert(ptr);
tmp.push(v)
}
}
}
Value::Array(vec) => {
for v in vec {
Self::walk_dedup(v, tmp, key, visited);
}
}
_ => {}
}
}
}
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