139 lines
3.8 KiB
Rust
139 lines
3.8 KiB
Rust
use common::*;
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/// Remove the `"0x"`, if present, from the left of `s`, returning the remaining slice.
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pub fn clean(s: &str) -> &str {
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if s.len() >= 2 && &s[0..2] == "0x" {
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&s[2..]
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} else {
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s
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}
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}
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fn u256_from_str(s: &str) -> U256 {
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if s.len() >= 2 && &s[0..2] == "0x" {
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U256::from_str(&s[2..]).unwrap_or_else(|_| U256::zero())
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} else {
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U256::from_dec_str(s).unwrap_or_else(|_| U256::zero())
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}
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}
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impl FromJson for Bytes {
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fn from_json(json: &Json) -> Self {
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match *json {
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Json::String(ref s) => match s.len() % 2 {
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0 => FromHex::from_hex(clean(s)).unwrap_or_else(|_| vec![]),
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_ => FromHex::from_hex(&("0".to_owned() + &(clean(s).to_owned()))[..]).unwrap_or_else(|_| vec![]),
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},
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_ => vec![],
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}
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}
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}
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impl FromJson for BTreeMap<H256, H256> {
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fn from_json(json: &Json) -> Self {
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match *json {
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Json::Object(ref o) => o.iter().map(|(key, value)| (x!(&u256_from_str(key)), x!(&U256::from_json(value)))).collect(),
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_ => BTreeMap::new(),
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}
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}
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}
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impl<T> FromJson for Vec<T> where T: FromJson {
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fn from_json(json: &Json) -> Self {
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match *json {
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Json::Array(ref o) => o.iter().map(|x|T::from_json(x)).collect(),
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_ => Vec::new(),
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}
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}
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}
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impl<T> FromJson for Option<T> where T: FromJson {
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fn from_json(json: &Json) -> Self {
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match *json {
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Json::String(ref o) if o.is_empty() => None,
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Json::Null => None,
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_ => Some(FromJson::from_json(json)),
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}
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}
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}
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impl FromJson for u64 {
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fn from_json(json: &Json) -> Self {
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U256::from_json(json).low_u64()
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}
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}
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impl FromJson for u32 {
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fn from_json(json: &Json) -> Self {
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U256::from_json(json).low_u64() as u32
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}
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}
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impl FromJson for u16 {
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fn from_json(json: &Json) -> Self {
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U256::from_json(json).low_u64() as u16
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}
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}
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#[test]
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fn u256_from_json() {
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let j = Json::from_str("{ \"dec\": \"10\", \"hex\": \"0x0a\", \"int\": 10 }").unwrap();
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let v: U256 = xjson!(&j["dec"]);
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assert_eq!(U256::from(10), v);
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let v: U256 = xjson!(&j["hex"]);
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assert_eq!(U256::from(10), v);
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let v: U256 = xjson!(&j["int"]);
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assert_eq!(U256::from(10), v);
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}
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#[test]
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fn h256_from_json() {
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let j = Json::from_str("{ \"with\": \"0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef\", \"without\": \"0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef\" }").unwrap();
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let v: H256 = xjson!(&j["with"]);
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assert_eq!(H256::from_str("1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef").unwrap(), v);
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let v: H256 = xjson!(&j["without"]);
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assert_eq!(H256::from_str("1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef").unwrap(), v);
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}
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#[test]
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fn vec_u256_from_json() {
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let j = Json::from_str("{ \"array\": [ \"10\", \"0x0a\", 10] }").unwrap();
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let v: Vec<U256> = xjson!(&j["array"]);
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assert_eq!(vec![U256::from(10); 3], v);
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}
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#[test]
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fn vec_h256_from_json() {
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let j = Json::from_str("{ \"array\": [ \"1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef\", \"0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef\"] }").unwrap();
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let v: Vec<H256> = xjson!(&j["array"]);
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assert_eq!(vec![H256::from_str("1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef").unwrap(); 2], v);
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}
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#[test]
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fn simple_types() {
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let j = Json::from_str("{ \"null\": null, \"empty\": \"\", \"int\": 42, \"dec\": \"42\", \"hex\": \"0x2a\" }").unwrap();
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let v: u16 = xjson!(&j["int"]);
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assert_eq!(42u16, v);
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let v: u32 = xjson!(&j["dec"]);
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assert_eq!(42u32, v);
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let v: u64 = xjson!(&j["hex"]);
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assert_eq!(42u64, v);
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}
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#[test]
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fn option_types() {
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let j = Json::from_str("{ \"null\": null, \"empty\": \"\", \"int\": 42, \"dec\": \"42\", \"hex\": \"0x2a\" }").unwrap();
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let v: Option<u16> = xjson!(&j["int"]);
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assert_eq!(Some(42u16), v);
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let v: Option<u16> = xjson!(&j["dec"]);
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assert_eq!(Some(42u16), v);
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let v: Option<u16> = xjson!(&j["null"]);
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assert_eq!(None, v);
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let v: Option<u16> = xjson!(&j["empty"]);
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assert_eq!(None, v);
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}
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