77 lines
1.5 KiB
Rust
77 lines
1.5 KiB
Rust
use super::*;
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#[derive(Debug)]
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pub(crate) struct Scope<'src: 'run, 'run> {
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parent: Option<&'run Self>,
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bindings: Table<'src, Binding<'src, String>>,
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}
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impl<'src, 'run> Scope<'src, 'run> {
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pub(crate) fn child(&'run self) -> Self {
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Self {
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parent: Some(self),
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bindings: Table::new(),
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}
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}
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pub(crate) fn root() -> Self {
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let mut root = Self {
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parent: None,
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bindings: Table::new(),
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};
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for (key, value) in constants() {
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root.bind(
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false,
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Name {
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token: Token {
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column: 0,
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kind: TokenKind::Identifier,
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length: key.len(),
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line: 0,
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offset: 0,
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path: Path::new("PRELUDE"),
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src: key,
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},
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},
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(*value).into(),
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);
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}
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root
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}
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pub(crate) fn bind(&mut self, export: bool, name: Name<'src>, value: String) {
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self.bindings.insert(Binding {
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depth: 0,
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export,
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name,
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value,
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});
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}
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pub(crate) fn bound(&self, name: &str) -> bool {
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self.bindings.contains_key(name)
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}
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pub(crate) fn value(&self, name: &str) -> Option<&str> {
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if let Some(binding) = self.bindings.get(name) {
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Some(binding.value.as_ref())
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} else {
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self.parent?.value(name)
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}
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}
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pub(crate) fn bindings(&self) -> impl Iterator<Item = &Binding<String>> {
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self.bindings.values()
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}
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pub(crate) fn names(&self) -> impl Iterator<Item = &str> {
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self.bindings.keys().copied()
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}
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pub(crate) fn parent(&self) -> Option<&'run Self> {
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self.parent
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}
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}
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