pub_just/
scope.rs

1use super::*;
2
3#[derive(Debug)]
4pub struct Scope<'src: 'run, 'run> {
5  parent: Option<&'run Self>,
6  bindings: Table<'src, Binding<'src, String>>,
7}
8
9impl<'src, 'run> Scope<'src, 'run> {
10  pub fn child(&'run self) -> Self {
11    Self {
12      parent: Some(self),
13      bindings: Table::new(),
14    }
15  }
16
17  pub fn root() -> Self {
18    let mut root = Self {
19      parent: None,
20      bindings: Table::new(),
21    };
22
23    for (key, value) in constants() {
24      root.bind(Binding {
25        constant: true,
26        export: false,
27        file_depth: 0,
28        name: Name {
29          token: Token {
30            column: 0,
31            kind: TokenKind::Identifier,
32            length: key.len(),
33            line: 0,
34            offset: 0,
35            path: Path::new("PRELUDE"),
36            src: key,
37          },
38        },
39        private: false,
40        value: (*value).into(),
41      });
42    }
43
44    root
45  }
46
47  pub fn bind(&mut self, binding: Binding<'src>) {
48    self.bindings.insert(binding);
49  }
50
51  pub fn bound(&self, name: &str) -> bool {
52    self.bindings.contains_key(name)
53  }
54
55  pub fn value(&self, name: &str) -> Option<&str> {
56    if let Some(binding) = self.bindings.get(name) {
57      Some(binding.value.as_ref())
58    } else {
59      self.parent?.value(name)
60    }
61  }
62
63  pub fn bindings(&self) -> impl Iterator<Item = &Binding<String>> {
64    self.bindings.values()
65  }
66
67  pub fn names(&self) -> impl Iterator<Item = &str> {
68    self.bindings.keys().copied()
69  }
70
71  pub fn parent(&self) -> Option<&'run Self> {
72    self.parent
73  }
74}
pub_just/scope.rs

pub_just/
scope.rs
