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Rust #39

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17bada5
Introduce Rust implementation
tiziano88 Nov 24, 2017
28847ed
Setup Rust CI
tiziano88 Nov 24, 2017
46fc968
Disable failing tests.
tiziano88 Nov 24, 2017
59548e8
Use BigInt for int numbers
tiziano88 Nov 24, 2017
49babd6
Remove beta Rust channel from CI
tiziano88 Nov 24, 2017
5993977
Attempt to fix Rust CI
tiziano88 Nov 24, 2017
8a924f5
Use sha2 crate for hashing
tiziano88 Nov 27, 2017
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6 changes: 5 additions & 1 deletion .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,11 @@
*.swp
*.so
pkg/
src/
/src/

# made by sbt
project/
objecthash_test

/rust/Cargo.lock
/rust/target
10 changes: 10 additions & 0 deletions .travis.yml
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Expand Up @@ -16,3 +16,13 @@ matrix:
- cd ruby
- bundle
- bundle exec rake
- language: rust
rust: stable
script:
- cd rust
- cargo test --verbose --all
- language: rust
rust: nightly
script:
- cd rust
- cargo test --verbose --all
8 changes: 8 additions & 0 deletions rust/Cargo.toml
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@@ -0,0 +1,8 @@
[package]
name = "objecthash"
version = "0.1.0"
authors = ["Tiziano Santoro <tiziano88@gmail.com>"]

[dependencies]
sha2 = "0.7.0"
num = "0.1.40"
251 changes: 251 additions & 0 deletions rust/src/lib.rs
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@@ -0,0 +1,251 @@
extern crate num;
extern crate sha2;

use sha2::{Digest, Sha256};
use num::bigint::BigInt;

pub enum Node {
Bool(bool),
Int(BigInt),
Float(f64),
String(String),
List(Vec<Node>),
Null,
// TODO: Support dictionaries.
}

const HASH_SIZE: usize = 32;

pub type Hash = [u8; HASH_SIZE];

impl Node {
pub fn hash(&self) -> Hash {
match self {
&Node::Bool(v) => {
let mut bb = vec!['b' as u8];
if v {
bb.push('1' as u8)
} else {
bb.push('0' as u8)
};
hash(&bb)
}
&Node::Int(ref v) => {
let mut bb = vec!['i' as u8];
bb.extend(format!("{}", v).bytes());
hash(&bb)
}
&Node::Float(f) => {
let mut f = f;
let mut bb = vec!['f' as u8];
if f < 0.0 {
f = -f;
bb.push('-' as u8);
} else {
bb.push('+' as u8);
}

{
let mut e = 0;
while f > 1.0 {
f /= 2.0;
e += 1;
}
while f <= 0.5 {
f *= 2.0;
e -= 1;
}
bb.extend(format!("{}:", e).bytes());
}

while f != 0.0 {
if f >= 1.0 {
bb.push('1' as u8);
f -= 1.0;
} else {
bb.push('0' as u8);
}
f *= 2.0;
}

hash(&bb)
}
&Node::String(ref v) => {
let mut bb = vec!['u' as u8];
bb.extend(v.bytes());
hash(&bb)
}
&Node::List(ref v) => {
let mut bb = vec!['l' as u8];
for n in v.iter() {
bb.extend(&n.hash());
}
hash(&bb)
}
&Node::Null => hash(&['n' as u8]),
}
}
}

fn hash(v: &[u8]) -> Hash {
let mut hasher = Sha256::default();
hasher.input(v);
let res = hasher.result();
let mut h = Hash::default();
for i in 0..HASH_SIZE {
h[i] = res[i];
}
h
}

fn format_hash(h: Hash) -> String {
let mut out = String::new();
for b in h.iter() {
out += &format!("{:02x}", b)
}
out
}

#[cfg(test)]
mod tests {
use super::*;
use num::bigint::ToBigInt;

#[test]
fn bool_false() {
test(
Node::Bool(false),
"c02c0b965e023abee808f2b548d8d5193a8b5229be6f3121a6f16e2d41a449b3".to_string(),
);
}

#[test]
fn bool_true() {
test(
Node::Bool(true),
"7dc96f776c8423e57a2785489a3f9c43fb6e756876d6ad9a9cac4aa4e72ec193".to_string(),
);
}

#[test]
fn float_positive() {
test(
Node::Float(1.2345),
"844e08b1195a93563db4e5d4faa59759ba0e0397caf065f3b6bc0825499754e0".to_string(),
);
}

#[test]
fn float_negative() {
test(
Node::Float(-10.1234),
"59b49ae24998519925833e3ff56727e5d4868aba4ecf4c53653638ebff53c366".to_string(),
);
}

#[test]
fn empty_list() {
test(
Node::List(vec![]),
"acac86c0e609ca906f632b0e2dacccb2b77d22b0621f20ebece1a4835b93f6f0".to_string(),
);
}

#[test]
fn list_with_null() {
test(
Node::List(vec![Node::Null]),
"5fb858ed3ef4275e64c2d5c44b77534181f7722b7765288e76924ce2f9f7f7db".to_string(),
);
}

#[ignore]
#[test]
fn list_with_int_1() {
test(
Node::List(vec![Node::Int(123.to_bigint().unwrap())]),
"2e72db006266ed9cdaa353aa22b9213e8a3c69c838349437c06896b1b34cee36".to_string(),
);
}

#[ignore]
#[test]
fn list_with_int_2() {
test(
Node::List(vec![
Node::Int(1.to_bigint().unwrap()),
Node::Int(2.to_bigint().unwrap()),
Node::Int(3.to_bigint().unwrap()),
]),
"925d474ac71f6e8cb35dd951d123944f7cabc5cda9a043cf38cd638cc0158db0".to_string(),
);
}

#[ignore]
#[test]
fn list_with_int_3() {
test(
Node::List(vec![Node::Int(123456789012345.to_bigint().unwrap())]),
"f446de5475e2f24c0a2b0cd87350927f0a2870d1bb9cbaa794e789806e4c0836".to_string(),
);
}

#[ignore]
#[test]
fn list_with_int_4() {
test(
Node::List(vec![
Node::Int(123456789012345.to_bigint().unwrap()),
Node::Int(678901234567890.to_bigint().unwrap()),
]),
"d4cca471f1c68f62fbc815b88effa7e52e79d110419a7c64c1ebb107b07f7f56".to_string(),
);
}

#[test]
fn list_with_string_1() {
test(
Node::List(vec![Node::String("foo".to_string())]),
"268bc27d4974d9d576222e4cdbb8f7c6bd6791894098645a19eeca9c102d0964".to_string(),
);
}

#[test]
fn list_with_string_2() {
test(
Node::List(vec![
Node::String("foo".to_string()),
Node::String("bar".to_string()),
]),
"32ae896c413cfdc79eec68be9139c86ded8b279238467c216cf2bec4d5f1e4a2".to_string(),
);
}

#[test]
fn unicode_1() {
test(
Node::String("ԱԲաբ".to_string()),
"2a2a4485a4e338d8df683971956b1090d2f5d33955a81ecaad1a75125f7a316c".to_string(),
);
}

#[test]
fn unicode_2() {
test(
Node::String("\u{03d3}".to_string()),
"f72826713a01881404f34975447bd6edcb8de40b191dc57097ebf4f5417a554d".to_string(),
);
}

#[test]
fn unicode_3() {
test(
Node::String("\u{03d2}\u{0301}".to_string()),
"42d5b13fb064849a988a86eb7650a22881c0a9ecf77057a1b07ab0dad385889c".to_string(),
);
}

fn test(v: Node, h: String) {
assert_eq!(h, format_hash(v.hash()));
}
}