json-patch 0.1.0

RFC 6902, JavaScript Object Notation (JSON) Patch
Documentation 
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extern crate test;
extern crate rand;

mod util;
mod generator;

use self::test::Bencher;
use self::rand::SeedableRng;
use super::*;
use serde_json::from_str;

#[test]
fn parse_from_value() {
    use PatchOperation::*;

    let json = json!([{"op": "add", "path": "/a/b", "value": 1}, {"op": "remove", "path": "/c"}]);
    let patch: Patch = from_value(json).unwrap();

    assert_eq!(patch, Patch(vec![
        Add(AddOperation {
            path: String::from("/a/b"),
            value: Value::from(1)
        }),
        Remove(RemoveOperation {
            path: String::from("/c")
        })])
    );

    let _patch: Patch = from_str(r#"[{"op": "add", "path": "/a/b", "value": 1}, {"op": "remove", "path": "/c"}]"#).unwrap();
}

#[test]
fn parse_from_string() {
    use PatchOperation::*;

    let patch: Patch = from_str(r#"[{"op": "add", "path": "/a/b", "value": 1}, {"op": "remove", "path": "/c"}]"#).unwrap();

    assert_eq!(patch, Patch(vec![
        Add(AddOperation {
            path: String::from("/a/b"),
            value: Value::from(1)
        }),
        Remove(RemoveOperation {
            path: String::from("/c")
        })])
    );
}

#[test]
fn serialize_patch() {
    let s = r#"[{"op":"add","path":"/a/b","value":1},{"op":"remove","path":"/c"}]"#;
    let patch: Patch = from_str(s).unwrap();

    let serialized = serde_json::to_string(&patch).unwrap();
    assert_eq!(serialized, s);
}

#[test]
fn tests() {
    util::run_specs("specs/tests.json");
}

#[test]
fn spec_tests() {
    util::run_specs("specs/spec_tests.json");
}

#[test]
fn revert_tests() {
    util::run_specs("specs/revert_tests.json");
}

#[bench]
fn bench_add_removes(b: &mut Bencher) {
    let mut rng = rand::StdRng::from_seed(&[0]);
    let params = generator::Params { ..Default::default() };
    let doc = params.gen(&mut rng);
    let patches = generator::gen_add_remove_patches(&doc, &mut rng, 10, 10);

    b.iter(|| {
        let mut doc = doc.clone();
        let mut result = Ok(());
        for ref p in &patches {
            // Patch mutable
            result = result.and_then(|_| patch(&mut doc, p));
        }
    });
}

#[bench]
fn bench_add_removes_unsafe(b: &mut Bencher) {
    let mut rng = rand::StdRng::from_seed(&[0]);
    let params = generator::Params { ..Default::default() };
    let doc = params.gen(&mut rng);
    let patches = generator::gen_add_remove_patches(&doc, &mut rng, 10, 10);

    b.iter(|| {
        let mut doc = doc.clone();
        let mut result = Ok(());
        for ref p in &patches {
            // Patch mutable
            result = unsafe { result.and_then(|_| patch_unsafe(&mut doc, p)) };
        }
    });
}