56 lines
1.2 KiB
Rust
56 lines
1.2 KiB
Rust
use crate::common::*;
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#[derive(Debug)]
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pub(crate) struct Scope<'src: 'run, 'run> {
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parent: Option<&'run Scope<'src, 'run>>,
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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) -> Scope<'src, 'run> {
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Scope {
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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 new() -> Scope<'src, 'run> {
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Scope {
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parent: None,
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bindings: Table::new(),
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}
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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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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 Scope<'src, 'run>> {
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self.parent
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}
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}
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