mirror of
https://github.com/nushell/nushell
synced 2024-12-29 06:23:11 +00:00
cf9813cbf8
# Description
This PR uses `str::lines` to simplify the `lines` command (and one other
section of code). This has two main benefits:
1. We no longer need to use regex to split on lines, as `str::lines`
splits on `\r\n` or `\n`.
2. We no longer need to handle blank empty lines at the end. E.g.,
`str::lines` results in `["text"]` for both `"test\n"` and `"text"`.
These changes give a slight boost to performance for the following
benchmarks:
1. lines of `Value::String`:
```nushell
let data = open Cargo.lock
1..10000 | each { $data | timeit { lines } } | math avg
```
current main: 392µs
this PR: 270µs
2. lines of external stream:
```nushell
1..10000 | each { open Cargo.lock | timeit { lines } } | math avg
```
current main: 794µs
this PR: 489µs
|
||
|---|---|---|
| .. | ||
| src | ||
| tests | ||
| Cargo.toml | ||
| CHANGELOG.md | ||
| LICENSE | ||
| README.md | ||
nu-json
a fork of serde_hjson.
The changes made to this crate are kept in CHANGELOG.
The Rust implementation of Hjson is based on the Serde JSON Serialization Library.
This crate is a Rust library for parsing and generating Human JSON Hjson. It is built upon Serde, a high performance generic serialization framework.
Install
This crate works with Cargo and can be found on crates.io with a Cargo.toml like:
[dependencies]
serde = "1"
nu-json = "0.76"
From the Commandline
Add with:
cargo add serde
cargo add nu-json
Usage
extern crate serde;
extern crate nu_json;
use nu_json::{Map,Value};
fn main() {
// Now let's look at decoding Hjson data
let sample_text=r#"
{
# specify rate in requests/second
rate: 1000
array:
[
foo
bar
]
}"#;
// Decode and unwrap.
let mut sample: Map<String, Value> = nu_json::from_str(&sample_text).unwrap();
// scope to control lifetime of borrow
{
// Extract the rate
let rate = sample.get("rate").unwrap().as_f64().unwrap();
println!("rate: {}", rate);
// Extract the array
let array : &mut Vec<Value> = sample.get_mut("array").unwrap().as_array_mut().unwrap();
println!("first: {}", array.first().unwrap());
// Add a value
array.push(Value::String("tak".to_string()));
}
// Encode to Hjson
let sample2 = nu_json::to_string(&sample).unwrap();
println!("Hjson:\n{}", sample2);
}
DOCS
At the moment, the documentation on serde_hjson / serde_json is also relevant for nu-json.