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Add `encode` and `decode` shortcut functions 

Now you can just use `json::encode` and `json::decode`, which is very
practical

**Deprecated `Encoder::str_encode` in favor of `json::encode`**

[breaking-change]
This commit is contained in:
Adolfo Ochagavía 2014-06-28 15:33:37 +02:00
parent 1e55dce0e4
commit 6ae5e92cc2
1 changed files with 49 additions and 61 deletions
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110
src/libserialize/json.rs
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@ -314,6 +314,23 @@ pub fn error_str(error: ErrorCode) -> &'static str {
} }
} }
/// Shortcut function to decode a JSON `&str` into an object
pub fn decode<T: ::Decodable<Decoder, DecoderError>>(s: &str) -> DecodeResult<T> {
let json = match from_str(s) {
Ok(x) => x,
Err(e) => return Err(ParseError(e))
};
let mut decoder = Decoder::new(json);
::Decodable::decode(&mut decoder)
}
/// Shortcut function to encode a `T` into a JSON `String`
pub fn encode<'a, T: Encodable<Encoder<'a>, io::IoError>>(object: &T) -> String {
let buff = Encoder::buffer_encode(object);
str::from_utf8_owned(buff).unwrap()
}
impl fmt::Show for ErrorCode { impl fmt::Show for ErrorCode {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
error_str(*self).fmt(f) error_str(*self).fmt(f)
@ -382,9 +399,11 @@ impl<'a> Encoder<'a> {
} }
/// Encode the specified struct into a json str /// Encode the specified struct into a json str
///
/// Note: this function is deprecated. Consider using `json::encode` instead.
#[deprecated = "Replaced by `json::encode`"]
pub fn str_encode<T: Encodable<Encoder<'a>, io::IoError>>(object: &T) -> String { pub fn str_encode<T: Encodable<Encoder<'a>, io::IoError>>(object: &T) -> String {
let buff = Encoder::buffer_encode(object); encode(object)
str::from_utf8_owned(buff).unwrap()
} }
} }
@ -2456,16 +2475,13 @@ mod tests {
#[test] #[test]
fn test_decode_identifiers() { fn test_decode_identifiers() {
let mut decoder = Decoder::new(from_str("null").unwrap()); let v: () = super::decode("null").unwrap();
let v: () = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, ()); assert_eq!(v, ());
let mut decoder = Decoder::new(from_str("true").unwrap()); let v: bool = super::decode("true").unwrap();
let v: bool = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, true); assert_eq!(v, true);
let mut decoder = Decoder::new(from_str("false").unwrap()); let v: bool = super::decode("false").unwrap();
let v: bool = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, false); assert_eq!(v, false);
} }
@ -2492,32 +2508,25 @@ mod tests {
#[test] #[test]
fn test_decode_numbers() { fn test_decode_numbers() {
let mut decoder = Decoder::new(from_str("3").unwrap()); let v: f64 = super::decode("3").unwrap();
let v: f64 = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, 3.0); assert_eq!(v, 3.0);
let mut decoder = Decoder::new(from_str("3.1").unwrap()); let v: f64 = super::decode("3.1").unwrap();
let v: f64 = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, 3.1); assert_eq!(v, 3.1);
let mut decoder = Decoder::new(from_str("-1.2").unwrap()); let v: f64 = super::decode("-1.2").unwrap();
let v: f64 = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, -1.2); assert_eq!(v, -1.2);
let mut decoder = Decoder::new(from_str("0.4").unwrap()); let v: f64 = super::decode("0.4").unwrap();
let v: f64 = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, 0.4); assert_eq!(v, 0.4);
let mut decoder = Decoder::new(from_str("0.4e5").unwrap()); let v: f64 = super::decode("0.4e5").unwrap();
let v: f64 = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, 0.4e5); assert_eq!(v, 0.4e5);
let mut decoder = Decoder::new(from_str("0.4e15").unwrap()); let v: f64 = super::decode("0.4e15").unwrap();
let v: f64 = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, 0.4e15); assert_eq!(v, 0.4e15);
let mut decoder = Decoder::new(from_str("0.4e-01").unwrap()); let v: f64 = super::decode("0.4e-01").unwrap();
let v: f64 = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, 0.4e-01); assert_eq!(v, 0.4e-01);
} }
@ -2551,13 +2560,8 @@ mod tests {
("\"\\uAB12\"", "\uAB12")]; ("\"\\uAB12\"", "\uAB12")];
for &(i, o) in s.iter() { for &(i, o) in s.iter() {
let mut decoder = Decoder::new(from_str(i).unwrap()); let v: String = super::decode(i).unwrap();
let v: String = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v.as_slice(), o); assert_eq!(v.as_slice(), o);
let mut decoder = Decoder::new(from_str(i).unwrap());
let v: String = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, o.to_string());
} }
} }
@ -2584,28 +2588,19 @@ mod tests {
#[test] #[test]
fn test_decode_list() { fn test_decode_list() {
let mut decoder = Decoder::new(from_str("[]").unwrap()); let v: Vec<()> = super::decode("[]").unwrap();
let v: Vec<()> = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, vec![]); assert_eq!(v, vec![]);
let mut decoder = Decoder::new(from_str("[null]").unwrap()); let v: Vec<()> = super::decode("[null]").unwrap();
let v: Vec<()> = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, vec![()]); assert_eq!(v, vec![()]);
let mut decoder = Decoder::new(from_str("[true]").unwrap()); let v: Vec<bool> = super::decode("[true]").unwrap();
let v: Vec<bool> = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, vec![true]); assert_eq!(v, vec![true]);
let mut decoder = Decoder::new(from_str("[true]").unwrap()); let v: Vec<int> = super::decode("[3, 1]").unwrap();
let v: Vec<bool> = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, vec![true]);
let mut decoder = Decoder::new(from_str("[3, 1]").unwrap());
let v: Vec<int> = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, vec![3, 1]); assert_eq!(v, vec![3, 1]);
let mut decoder = Decoder::new(from_str("[[3], [1, 2]]").unwrap()); let v: Vec<Vec<uint>> = super::decode("[[3], [1, 2]]").unwrap();
let v: Vec<Vec<uint>> = Decodable::decode(&mut decoder).unwrap();
assert_eq!(v, vec![vec![3], vec![1, 2]]); assert_eq!(v, vec![vec![3], vec![1, 2]]);
} }
@ -2671,8 +2666,8 @@ mod tests {
{ \"a\": null, \"b\": 2, \"c\": [\"abc\", \"xyz\"] } { \"a\": null, \"b\": 2, \"c\": [\"abc\", \"xyz\"] }
] ]
}"; }";
let mut decoder = Decoder::new(from_str(s).unwrap());
let v: Outer = Decodable::decode(&mut decoder).unwrap(); let v: Outer = super::decode(s).unwrap();
assert_eq!( assert_eq!(
v, v,
Outer { Outer {
@ -2690,35 +2685,29 @@ mod tests {
} }
#[test] #[test]
fn test_decode_struct_with_nan() { fn test_decode_struct_with_nan() {
let encoded_str = "{\"f\":null,\"a\":[null,123]}"; let s = "{\"f\":null,\"a\":[null,123]}";
let json_object = from_str(encoded_str.as_slice()); let obj: FloatStruct = super::decode(s).unwrap();
let mut decoder = Decoder::new(json_object.unwrap()); assert!(obj.f.is_nan());
let after: FloatStruct = Decodable::decode(&mut decoder).unwrap(); assert!(obj.a.get(0).is_nan());
assert!(after.f.is_nan()); assert_eq!(obj.a.get(1), &123f64);
assert!(after.a.get(0).is_nan());
assert_eq!(after.a.get(1), &123f64);
} }
#[test] #[test]
fn test_decode_option() { fn test_decode_option() {
let mut decoder = Decoder::new(from_str("null").unwrap()); let value: Option<String> = super::decode("null").unwrap();
let value: Option<String> = Decodable::decode(&mut decoder).unwrap();
assert_eq!(value, None); assert_eq!(value, None);
let mut decoder = Decoder::new(from_str("\"jodhpurs\"").unwrap()); let value: Option<String> = super::decode("\"jodhpurs\"").unwrap();
let value: Option<String> = Decodable::decode(&mut decoder).unwrap();
assert_eq!(value, Some("jodhpurs".to_string())); assert_eq!(value, Some("jodhpurs".to_string()));
} }
#[test] #[test]
fn test_decode_enum() { fn test_decode_enum() {
let mut decoder = Decoder::new(from_str("\"Dog\"").unwrap()); let value: Animal = super::decode("\"Dog\"").unwrap();
let value: Animal = Decodable::decode(&mut decoder).unwrap();
assert_eq!(value, Dog); assert_eq!(value, Dog);
let s = "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}"; let s = "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}";
let mut decoder = Decoder::new(from_str(s).unwrap()); let value: Animal = super::decode(s).unwrap();
let value: Animal = Decodable::decode(&mut decoder).unwrap();
assert_eq!(value, Frog("Henry".to_string(), 349)); assert_eq!(value, Frog("Henry".to_string(), 349));
} }
@ -2726,8 +2715,7 @@ mod tests {
fn test_decode_map() { fn test_decode_map() {
let s = "{\"a\": \"Dog\", \"b\": {\"variant\":\"Frog\",\ let s = "{\"a\": \"Dog\", \"b\": {\"variant\":\"Frog\",\
\"fields\":[\"Henry\", 349]}}"; \"fields\":[\"Henry\", 349]}}";
let mut decoder = Decoder::new(from_str(s).unwrap()); let mut map: TreeMap<String, Animal> = super::decode(s).unwrap();
let mut map: TreeMap<String, Animal> = Decodable::decode(&mut decoder).unwrap();
assert_eq!(map.pop(&"a".to_string()), Some(Dog)); assert_eq!(map.pop(&"a".to_string()), Some(Dog));
assert_eq!(map.pop(&"b".to_string()), Some(Frog("Henry".to_string(), 349))); assert_eq!(map.pop(&"b".to_string()), Some(Frog("Henry".to_string(), 349)));