hue 0.0.1

The beginnings of a Philips Hue client library
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74

/// Because honestly the existing parser is pants-on-head.
extern crate serialize;
use serialize::json;
use serialize::json::Json;

pub trait FromJson {
  fn from_json(j: &Json) -> Option<Self>;
}

impl FromJson for bool {
  fn from_json(jb: &Json) -> Option<bool> {
    match jb {
      &json::Boolean(b) => Some(b),
      _ => None
    }
  }
}
impl FromJson for u8 {
  fn from_json(j: &Json) -> Option<u8> {
    match j {
      &json::U64(n) => Some(n as u8),
      _ => None
    }
  }
}
impl FromJson for u16 {
  fn from_json(j: &Json) -> Option<u16> {
    match j {
      &json::U64(n) => Some(n as u16),
      _ => None
    }
  }
}
impl FromJson for f32 {
  fn from_json(j: &Json) -> Option<f32> {
    match j {
      &json::F64(n) => Some(n as f32),
      _ => None
    }
  }
}

impl FromJson for String {
  fn from_json(j: &Json) -> Option<String> {
    // This is really crummy that I need to copy.
    match j {
      &json::String(ref s) => Some(s.clone()),
      _ => None
    }
  }
}

impl<T, U> FromJson for (T, U) where T: FromJson, U: FromJson {
  fn from_json(j: &Json) -> Option<(T, U)> {
    match j {
      &json::List(ref vec) => {
          if vec.len() != 2 { return None };
          let (f1, f2) = (FromJson::from_json(&vec[0]),
                          FromJson::from_json(&vec[1]));
          if f1.is_some() && f2.is_some() {
            return Some((f1.unwrap(), f2.unwrap()));
          }
          None
        },
      _ => None
    }
  }
}

#[test]
fn test() {
  let b: Option<bool> = FromJson::from_json(&json::U64(1));
  assert_eq!(None, b);
}