toml_edit/
index.rs

1use std::ops;
2
3use crate::key::Key;
4use crate::DocumentMut;
5use crate::{value, InlineTable, Item, Table, Value};
6
7// copied from
8// https://github.com/serde-rs/json/blob/master/src/value/index.rs
9
10pub trait Index: crate::private::Sealed {
11    #[doc(hidden)]
12    fn index<'v>(&self, val: &'v Item) -> Option<&'v Item>;
13    #[doc(hidden)]
14    fn index_mut<'v>(&self, val: &'v mut Item) -> Option<&'v mut Item>;
15}
16
17impl Index for usize {
18    fn index<'v>(&self, v: &'v Item) -> Option<&'v Item> {
19        match *v {
20            Item::ArrayOfTables(ref aot) => aot.values.get(*self),
21            Item::Value(ref a) if a.is_array() => a.as_array().and_then(|a| a.values.get(*self)),
22            _ => None,
23        }
24    }
25    fn index_mut<'v>(&self, v: &'v mut Item) -> Option<&'v mut Item> {
26        match *v {
27            Item::ArrayOfTables(ref mut vec) => vec.values.get_mut(*self),
28            Item::Value(ref mut a) => a.as_array_mut().and_then(|a| a.values.get_mut(*self)),
29            _ => None,
30        }
31    }
32}
33
34impl Index for str {
35    fn index<'v>(&self, v: &'v Item) -> Option<&'v Item> {
36        match *v {
37            Item::Table(ref t) => t.get(self),
38            Item::Value(ref v) => v
39                .as_inline_table()
40                .and_then(|t| t.items.get(self))
41                .and_then(|value| if !value.is_none() { Some(value) } else { None }),
42            _ => None,
43        }
44    }
45    fn index_mut<'v>(&self, v: &'v mut Item) -> Option<&'v mut Item> {
46        if let Item::None = *v {
47            let mut t = InlineTable::default();
48            t.items.insert(Key::new(self), Item::None);
49            *v = value(Value::InlineTable(t));
50        }
51        match *v {
52            Item::Table(ref mut t) => Some(t.entry(self).or_insert(Item::None)),
53            Item::Value(ref mut v) => v
54                .as_inline_table_mut()
55                .map(|t| t.items.entry(Key::new(self)).or_insert_with(|| Item::None)),
56            _ => None,
57        }
58    }
59}
60
61impl Index for String {
62    fn index<'v>(&self, v: &'v Item) -> Option<&'v Item> {
63        self[..].index(v)
64    }
65    fn index_mut<'v>(&self, v: &'v mut Item) -> Option<&'v mut Item> {
66        self[..].index_mut(v)
67    }
68}
69
70impl<T: ?Sized> Index for &T
71where
72    T: Index,
73{
74    fn index<'v>(&self, v: &'v Item) -> Option<&'v Item> {
75        (**self).index(v)
76    }
77    fn index_mut<'v>(&self, v: &'v mut Item) -> Option<&'v mut Item> {
78        (**self).index_mut(v)
79    }
80}
81
82impl<I> ops::Index<I> for Item
83where
84    I: Index,
85{
86    type Output = Item;
87
88    fn index(&self, index: I) -> &Item {
89        index.index(self).expect("index not found")
90    }
91}
92
93impl<I> ops::IndexMut<I> for Item
94where
95    I: Index,
96{
97    fn index_mut(&mut self, index: I) -> &mut Item {
98        index.index_mut(self).expect("index not found")
99    }
100}
101
102impl<'s> ops::Index<&'s str> for Table {
103    type Output = Item;
104
105    fn index(&self, key: &'s str) -> &Item {
106        self.get(key).expect("index not found")
107    }
108}
109
110impl<'s> ops::IndexMut<&'s str> for Table {
111    fn index_mut(&mut self, key: &'s str) -> &mut Item {
112        self.entry(key).or_insert(Item::None)
113    }
114}
115
116impl<'s> ops::Index<&'s str> for InlineTable {
117    type Output = Value;
118
119    fn index(&self, key: &'s str) -> &Value {
120        self.get(key).expect("index not found")
121    }
122}
123
124impl<'s> ops::IndexMut<&'s str> for InlineTable {
125    fn index_mut(&mut self, key: &'s str) -> &mut Value {
126        self.get_mut(key).expect("index not found")
127    }
128}
129
130impl<'s> ops::Index<&'s str> for DocumentMut {
131    type Output = Item;
132
133    fn index(&self, key: &'s str) -> &Item {
134        self.root.index(key)
135    }
136}
137
138impl<'s> ops::IndexMut<&'s str> for DocumentMut {
139    fn index_mut(&mut self, key: &'s str) -> &mut Item {
140        self.root.index_mut(key)
141    }
142}
toml_edit/index.rs

toml_edit/
index.rs
