json_codec_wasm/
ast.rs

1//! JSON AST definition.
2use std::borrow::Borrow;
3use std::collections::HashMap;
4
5#[derive(Clone, Debug, PartialEq)]
6pub enum Json {
7    Bool(bool),
8    I128(i128),
9    U128(u128),
10    String(String),
11    Array(Vec<Json>),
12    Object(HashMap<String, Json>),
13    Null,
14}
15
16/// A reference to some `Json` value.
17///
18/// Mostly used for navigating complex `Json` values
19/// and extracting values from specific locations.
20pub struct Ref<'r> {
21    value: Option<&'r Json>,
22}
23
24impl<'r> Ref<'r> {
25    pub fn new(v: &'r Json) -> Ref<'r> {
26        Ref { value: Some(v) }
27    }
28
29    fn of(v: Option<&'r Json>) -> Ref<'r> {
30        Ref { value: v }
31    }
32
33    pub fn at(&self, i: usize) -> Ref<'r> {
34        match self.value {
35            Some(&Json::Array(ref a)) => Ref::of(a.get(i)),
36            _ => Ref::of(None),
37        }
38    }
39
40    pub fn get<K: Borrow<str>>(&self, k: K) -> Ref<'r> {
41        match self.value {
42            Some(&Json::Object(ref m)) => Ref::of(m.get(k.borrow())),
43            _ => Ref::of(None),
44        }
45    }
46
47    pub fn value(&self) -> Option<&Json> {
48        self.value
49    }
50
51    pub fn opt(&self) -> Option<Ref<'r>> {
52        match self.value {
53            Some(&Json::Null) => None,
54            Some(ref v) => Some(Ref::new(v)),
55            _ => None,
56        }
57    }
58
59    pub fn bool(&self) -> Option<bool> {
60        match self.value {
61            Some(&Json::Bool(x)) => Some(x),
62            _ => None,
63        }
64    }
65
66    pub fn string(&self) -> Option<&str> {
67        match self.value {
68            Some(&Json::String(ref x)) => Some(x),
69            _ => None,
70        }
71    }
72
73    pub fn i128(&self) -> Option<i128> {
74        match self.value {
75            Some(&Json::I128(x)) => Some(x),
76            _ => None,
77        }
78    }
79
80    pub fn u128(&self) -> Option<u128> {
81        match self.value {
82            Some(&Json::U128(x)) => Some(x),
83            _ => None,
84        }
85    }
86
87    pub fn slice(&self) -> Option<&[Json]> {
88        match self.value {
89            Some(&Json::Array(ref v)) => Some(v),
90            _ => None,
91        }
92    }
93}
json_codec_wasm/ast.rs

json_codec_wasm/
ast.rs
