32 lines
1.2 KiB
Rust
32 lines
1.2 KiB
Rust
|
// Copyright 2016 Mozilla
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
|
||
|
|
// this file except in compliance with the License. You may obtain a copy of the
|
||
|
|
// License at http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
// Unless required by applicable law or agreed to in writing, software distributed
|
||
|
|
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
||
|
|
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
|
||
|
|
// specific language governing permissions and limitations under the License.
|
||
|
|
|
||
|
|
#![allow(dead_code)]
|
||
|
|
|
||
|
|
use types::Value;
|
||
|
|
|
||
|
|
/// Merge the EDN `Value::Map` instance `right` into `left`. Returns `None` if either `left` or
|
||
|
|
/// `right` is not a `Value::Map`.
|
||
|
|
///
|
||
|
|
/// Keys present in `right` overwrite keys present in `left`. See also
|
||
|
|
/// https://clojuredocs.org/clojure.core/merge.
|
||
|
|
///
|
||
|
|
/// TODO: implement `merge` for [Value], following the `concat`/`SliceConcatExt` pattern.
|
||
|
|
pub fn merge(left: &Value, right: &Value) -> Option<Value> {
|
||
|
|
match (left, right) {
|
||
|
|
(&Value::Map(ref l), &Value::Map(ref r)) => {
|
||
|
|
let mut result = l.clone();
|
||
|
|
result.extend(r.clone().into_iter());
|
||
|
|
Some(Value::Map(result))
|
||
|
|
}
|
||
|
|
_ => None
|
||
|
|
}
|
||
|
|
}
|