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use std::fmt::Write;
use serde_json::Value;
#[derive(Debug, Clone)]
pub enum SelectorPart {
Field(String),
Index(usize),
}
pub type Selector = Vec<SelectorPart>;
pub fn to_jsonpath(sel: &Selector) -> String {
let mut s = String::from("$");
for part in sel {
match part {
SelectorPart::Field(name) => {
if is_jsonpath_safe(name) {
write!(&mut s, ".{}", name).unwrap();
} else {
// This is probably wrong in edge cases, but all Id's are
// just ascii alphanumerics, `-` `_`, and `:`
write!(&mut s, "[{name:?}]").unwrap();
}
}
SelectorPart::Index(idx) => write!(&mut s, "[{idx}]").unwrap(),
}
}
s
}
fn is_jsonpath_safe(s: &str) -> bool {
s.chars().all(|c| c.is_ascii_alphanumeric() || c == '_')
}
pub fn find_selector(haystack: &Value, needle: &Value) -> Vec<Selector> {
let mut result = Vec::new();
let mut sel = Selector::new();
find_selector_recursive(haystack, needle, &mut result, &mut sel);
result
}
fn find_selector_recursive(
haystack: &Value,
needle: &Value,
result: &mut Vec<Selector>,
pos: &mut Selector,
) {
if needle == haystack {
result.push(pos.clone());
// Haystack cant both contain needle and be needle
} else {
match haystack {
Value::Null => {}
Value::Bool(_) => {}
Value::Number(_) => {}
Value::String(_) => {}
Value::Array(arr) => {
for (idx, subhaystack) in arr.iter().enumerate() {
pos.push(SelectorPart::Index(idx));
find_selector_recursive(subhaystack, needle, result, pos);
pos.pop().unwrap();
}
}
Value::Object(obj) => {
for (key, subhaystack) in obj {
pos.push(SelectorPart::Field(key.clone()));
find_selector_recursive(subhaystack, needle, result, pos);
pos.pop().unwrap();
}
}
}
}
}
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