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use crate::utils::{DedupeHashValue, HashValue};
use serde_json::Value::{self, *};
use std::collections::HashSet;
#[cfg(test)]
mod tests;
mod utils;
pub trait JsonUtils {
/// Remove `Null` value fields from serde_json::Value
/// ## Example
/// ```rust
/// use serde_json::{Value, from_str};
/// use serde_json_utils::{JsonUtils};
///
/// let mut x: Value = from_str(r###"{"key1": null, "key2": "foo"}"###).unwrap();
/// let x_result: Value = from_str(r###"{"key2": "foo"}"###).unwrap();
///
/// x.skip_null();
/// assert_eq!(x, x_result);
/// ```
fn skip_null(&mut self);
/// Remove `Null` value fields & `empty` value fields from serde_json::Value
/// ## Example
/// ```rust
/// use serde_json::{Value, from_str};
/// use serde_json_utils::{JsonUtils};
///
/// let mut x: Value = from_str(r###"{"key1": null, "key2": "foo", "key3": [], "key4": {}}"###).unwrap();
/// let x_result: Value = from_str(r###"{"key2": "foo"}"###).unwrap();
///
/// x.skip_null_and_empty();
/// assert_eq!(x, x_result);
/// ```
fn skip_null_and_empty(&mut self);
/// `Dedup` array of json's from serde_json::Value
/// ## Example
/// ```rust
/// use serde_json::{Value, from_str};
/// use serde_json_utils::{JsonUtils};
///
/// let mut x: Value = from_str(r###"[{"key1": "foo", "key2": "bar", "key3": [1, 1, 2]}, {"key1": "foo", "key2": "bar", "key3": [1, 1, 2]}]"###).unwrap();
/// let x_result: Value = from_str(r###"[{"key1": "foo", "key2": "bar", "key3": [1, 2]}]"###).unwrap();
///
/// x.dedup();
/// assert_eq!(x, x_result);
/// ```
fn dedup(&mut self);
fn merge_similar(&mut self);
}
impl JsonUtils for Value {
/// Remove `Null` value fields from serde_json::Value
/// ## Example
/// ```rust
/// use serde_json::{Value, from_str};
/// use serde_json_utils::{JsonUtils};
///
/// let mut x: Value = from_str(r###"{"key1": null, "key2": "foo"}"###).unwrap();
/// let x_result: Value = from_str(r###"{"key2": "foo"}"###).unwrap();
///
/// x.skip_null();
/// assert_eq!(x, x_result);
/// ```
fn skip_null(&mut self) {
remove_nulls(self, false);
}
/// Remove `Null` value fields & `empty` value fields from serde_json::Value
/// ## Example
/// ```rust
/// use serde_json::{Value, from_str};
/// use serde_json_utils::{JsonUtils};
///
/// let mut x: Value = from_str(r###"{"key1": null, "key2": "foo", "key3": [], "key4": {}}"###).unwrap();
/// let x_result: Value = from_str(r###"{"key2": "foo"}"###).unwrap();
///
/// x.skip_null_and_empty();
/// assert_eq!(x, x_result);
/// ```
fn skip_null_and_empty(&mut self) {
remove_nulls(self, true);
}
/// `Dedup` array of json's from serde_json::Value
/// ## Example
/// ```rust
/// use serde_json::{Value, from_str};
/// use serde_json_utils::{JsonUtils};
///
/// let mut x: Value = from_str(r###"[{"key1": "foo", "key2": "bar", "key3": [1, 1, 2]}, {"key1": "foo", "key2": "bar", "key3": [1, 1, 2]}]"###).unwrap();
/// let x_result: Value = from_str(r###"[{"key1": "foo", "key2": "bar", "key3": [1, 2]}]"###).unwrap();
///
/// x.dedup();
/// assert_eq!(x, x_result);
/// ```
fn dedup(&mut self) {
match self {
Null => {}
Bool(_) => {}
Number(_) => {}
String(_) => {}
Array(a) => {
let mut aa = a.clone();
for v in &mut aa {
v.dedup();
}
let mut set = HashSet::new();
let mut candidates = vec![];
for v in &aa {
if !set.contains(&DedupeHashValue(v)) {
set.insert(DedupeHashValue(v));
candidates.push(v.clone());
}
}
a.clear();
a.extend(candidates);
}
Object(o) => {
for (_, v) in o.iter_mut() {
v.dedup();
}
}
}
}
fn merge_similar(&mut self) {
match self {
Array(arr) => {
let mut res: HashSet<HashValue> = HashSet::new();
let aarr = arr.clone();
for v in aarr {
if let Some(s) = res.take(&HashValue(v.clone())) {
if let Ok(m) = merge_similar_objects(&s.0, &v) {
res.insert(HashValue(m));
} else {
res.insert(s);
res.insert(HashValue(v.clone()));
}
} else {
res.insert(HashValue(v.clone()));
}
}
arr.clear();
arr.extend(res.into_iter().map(|s| s.0).collect::<Vec<Value>>());
}
Object(obj) => {
for (_k, v) in obj {
v.merge_similar();
}
}
_ => {}
}
}
}
/// Remove `Null` value fields & `empty` value fields from serde_json::Value
fn remove_nulls(val: &mut Value, with_empties: bool) -> bool {
match val {
Null => {
return true;
}
Bool(_) => {}
Number(_) => {}
String(_) => {}
Array(arr) => {
if with_empties && arr.is_empty() {
return true;
}
let mut candidates = vec![];
for v in &mut arr.clone() {
if !remove_nulls(v, with_empties) {
candidates.push(v.clone());
}
}
arr.clear();
arr.extend(candidates);
}
Object(obj) => {
if with_empties && obj.is_empty() {
return true;
}
let mut candidates = vec![];
for (k, v) in obj.iter_mut() {
if remove_nulls(v, with_empties) {
candidates.push(k.clone());
}
}
for c in candidates {
obj.remove(&c);
}
}
}
false
}
/// merge similar objects
fn merge_similar_objects(p: &Value, v: &Value) -> Result<Value, ()> {
match (p, v) {
(Object(a), Object(b)) => {
if HashValue(p.clone()) != HashValue(v.clone()) {
return Err(());
}
let mut res = serde_json::Map::new();
for (k, v) in a {
let bv = b.get(k).unwrap();
if let (Array(_arr1), Array(_arr2)) = (v, bv) {
if v.eq(bv) {
res.insert(k.clone(), v.clone());
} else {
res.insert(k.clone(), Array(vec![v.clone(), bv.clone()]));
}
} else if let (Array(arr1), _) = (v, bv) {
let mut aaa = arr1.clone();
if !aaa.contains(bv) {
aaa.push(bv.clone());
}
res.insert(k.clone(), Array(aaa));
} else if v.eq(bv) {
res.insert(k.clone(), v.clone());
} else {
res.insert(k.clone(), Array(vec![v.clone(), bv.clone()]));
}
}
Ok(Object(res))
}
_ => Err(()),
}
}