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Invert structure of Scope#shadowed_bindings (#4855)

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Charlie Marsh 2023-06-04 22:03:21 -04:00 • committed by GitHub
parent 694bf7f5b8
commit a0721912a4
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1 changed files with 13 additions and 13 deletions
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26
crates/ruff_python_semantic/src/scope.rs
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@ -1,3 +1,5 @@
use nohash_hasher::{BuildNoHashHasher, IntMap};
use std::collections::HashMap;
use std::ops::{Deref, DerefMut};
use rustc_hash::FxHashMap;
@ -17,10 +19,10 @@ pub struct Scope<'a> {
/// A list of star imports in this scope. These represent _module_ imports (e.g., `sys` in
/// `from sys import *`), rather than individual bindings (e.g., individual members in `sys`).
star_imports: Vec<StarImportation<'a>>,
/// A map from bound name to binding index, for current bindings.
/// A map from bound name to binding ID.
bindings: FxHashMap<&'a str, BindingId>,
/// A map from bound name to binding index, for bindings that were shadowed later in the scope.
shadowed_bindings: FxHashMap<&'a str, Vec<BindingId>>,
/// A map from binding ID to binding ID that it shadows.
shadowed_bindings: HashMap<BindingId, BindingId, BuildNoHashHasher<BindingId>>,
/// Index into the globals arena, if the scope contains any globally-declared symbols.
globals_id: Option<GlobalsId>,
}
@ -33,7 +35,7 @@ impl<'a> Scope<'a> {
uses_locals: false,
star_imports: Vec::default(),
bindings: FxHashMap::default(),
shadowed_bindings: FxHashMap::default(),
shadowed_bindings: IntMap::default(),
globals_id: None,
}
}
@ -45,7 +47,7 @@ impl<'a> Scope<'a> {
uses_locals: false,
star_imports: Vec::default(),
bindings: FxHashMap::default(),
shadowed_bindings: FxHashMap::default(),
shadowed_bindings: IntMap::default(),
globals_id: None,
}
}
@ -57,9 +59,9 @@ impl<'a> Scope<'a> {
/// Adds a new binding with the given name to this scope.
pub fn add(&mut self, name: &'a str, id: BindingId) -> Option<BindingId> {
if let Some(id) = self.bindings.insert(name, id) {
self.shadowed_bindings.entry(name).or_default().push(id);
Some(id)
if let Some(shadowed) = self.bindings.insert(name, id) {
self.shadowed_bindings.insert(id, shadowed);
Some(shadowed)
} else {
None
}
@ -88,11 +90,9 @@ impl<'a> Scope<'a> {
/// Returns an iterator over all [bindings](BindingId) bound to the given name, including
/// those that were shadowed by later bindings.
pub fn bindings_for_name(&self, name: &str) -> impl Iterator<Item = BindingId> + '_ {
self.bindings
.get(name)
.into_iter()
.chain(self.shadowed_bindings.get(name).into_iter().flatten().rev())
.copied()
std::iter::successors(self.bindings.get(name).copied(), |id| {
self.shadowed_bindings.get(id).copied()
})
}
/// Adds a reference to a star import (e.g., `from sys import *`) to this scope.