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//! Describes items defined or visible (ie, imported) in a certain scope.
//! This is shared between modules and blocks.
use hir_expand::name::Name;
use once_cell::sync::Lazy;
use rustc_hash::FxHashMap;
use crate::{
per_ns::PerNs, visibility::Visibility, AdtId, BuiltinType, ImplId, MacroDefId, ModuleDefId,
TraitId,
};
#[derive(Debug, Default, PartialEq, Eq)]
pub struct ItemScope {
visible: FxHashMap<Name, PerNs>,
defs: Vec<ModuleDefId>,
impls: Vec<ImplId>,
/// Macros visible in current module in legacy textual scope
///
/// For macros invoked by an unqualified identifier like `bar!()`, `legacy_macros` will be searched in first.
/// If it yields no result, then it turns to module scoped `macros`.
/// It macros with name qualified with a path like `crate::foo::bar!()`, `legacy_macros` will be skipped,
/// and only normal scoped `macros` will be searched in.
///
/// Note that this automatically inherit macros defined textually before the definition of module itself.
///
/// Module scoped macros will be inserted into `items` instead of here.
// FIXME: Macro shadowing in one module is not properly handled. Non-item place macros will
// be all resolved to the last one defined if shadowing happens.
legacy_macros: FxHashMap<Name, MacroDefId>,
}
static BUILTIN_SCOPE: Lazy<FxHashMap<Name, PerNs>> = Lazy::new(|| {
BuiltinType::ALL
.iter()
.map(|(name, ty)| (name.clone(), PerNs::types(ty.clone().into(), Visibility::Public)))
.collect()
});
/// Shadow mode for builtin type which can be shadowed by module.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub(crate) enum BuiltinShadowMode {
// Prefer Module
Module,
// Prefer Other Types
Other,
}
/// Legacy macros can only be accessed through special methods like `get_legacy_macros`.
/// Other methods will only resolve values, types and module scoped macros only.
impl ItemScope {
pub fn entries<'a>(&'a self) -> impl Iterator<Item = (&'a Name, PerNs)> + 'a {
//FIXME: shadowing
self.visible.iter().chain(BUILTIN_SCOPE.iter()).map(|(n, def)| (n, *def))
}
pub fn entries_without_primitives<'a>(
&'a self,
) -> impl Iterator<Item = (&'a Name, PerNs)> + 'a {
self.visible.iter().map(|(n, def)| (n, *def))
}
pub fn declarations(&self) -> impl Iterator<Item = ModuleDefId> + '_ {
self.defs.iter().copied()
}
pub fn impls(&self) -> impl Iterator<Item = ImplId> + ExactSizeIterator + '_ {
self.impls.iter().copied()
}
/// Iterate over all module scoped macros
pub(crate) fn macros<'a>(&'a self) -> impl Iterator<Item = (&'a Name, MacroDefId)> + 'a {
self.visible.iter().filter_map(|(name, def)| def.take_macros().map(|macro_| (name, macro_)))
}
/// Iterate over all legacy textual scoped macros visible at the end of the module
pub(crate) fn legacy_macros<'a>(&'a self) -> impl Iterator<Item = (&'a Name, MacroDefId)> + 'a {
self.legacy_macros.iter().map(|(name, def)| (name, *def))
}
/// Get a name from current module scope, legacy macros are not included
pub(crate) fn get(&self, name: &Name, shadow: BuiltinShadowMode) -> PerNs {
match shadow {
BuiltinShadowMode::Module => self
.visible
.get(name)
.or_else(|| BUILTIN_SCOPE.get(name))
.copied()
.unwrap_or_else(PerNs::none),
BuiltinShadowMode::Other => {
let item = self.visible.get(name).copied();
if let Some(def) = item {
if let Some(ModuleDefId::ModuleId(_)) = def.take_types() {
return BUILTIN_SCOPE
.get(name)
.copied()
.or(item)
.unwrap_or_else(PerNs::none);
}
}
item.or_else(|| BUILTIN_SCOPE.get(name).copied()).unwrap_or_else(PerNs::none)
}
}
}
pub(crate) fn name_of(&self, item: ItemInNs) -> Option<(&Name, Visibility)> {
for (name, per_ns) in &self.visible {
if let Some(vis) = item.match_with(*per_ns) {
return Some((name, vis));
}
}
None
}
pub(crate) fn traits<'a>(&'a self) -> impl Iterator<Item = TraitId> + 'a {
self.visible.values().filter_map(|def| match def.take_types() {
Some(ModuleDefId::TraitId(t)) => Some(t),
_ => None,
})
}
pub(crate) fn define_def(&mut self, def: ModuleDefId) {
self.defs.push(def)
}
pub(crate) fn get_legacy_macro(&self, name: &Name) -> Option<MacroDefId> {
self.legacy_macros.get(name).copied()
}
pub(crate) fn define_impl(&mut self, imp: ImplId) {
self.impls.push(imp)
}
pub(crate) fn define_legacy_macro(&mut self, name: Name, mac: MacroDefId) {
self.legacy_macros.insert(name, mac);
}
pub(crate) fn push_res(&mut self, name: Name, def: PerNs) -> bool {
let mut changed = false;
let existing = self.visible.entry(name).or_default();
if existing.types.is_none() && def.types.is_some() {
existing.types = def.types;
changed = true;
}
if existing.values.is_none() && def.values.is_some() {
existing.values = def.values;
changed = true;
}
if existing.macros.is_none() && def.macros.is_some() {
existing.macros = def.macros;
changed = true;
}
changed
}
pub(crate) fn resolutions<'a>(&'a self) -> impl Iterator<Item = (Name, PerNs)> + 'a {
self.visible.iter().map(|(name, res)| (name.clone(), res.clone()))
}
pub(crate) fn collect_legacy_macros(&self) -> FxHashMap<Name, MacroDefId> {
self.legacy_macros.clone()
}
}
impl PerNs {
pub(crate) fn from_def(def: ModuleDefId, v: Visibility) -> PerNs {
match def {
ModuleDefId::ModuleId(_) => PerNs::types(def, v),
ModuleDefId::FunctionId(_) => PerNs::values(def, v),
ModuleDefId::AdtId(adt) => match adt {
AdtId::StructId(_) | AdtId::UnionId(_) => PerNs::both(def, def, v),
AdtId::EnumId(_) => PerNs::types(def, v),
},
ModuleDefId::EnumVariantId(_) => PerNs::both(def, def, v),
ModuleDefId::ConstId(_) | ModuleDefId::StaticId(_) => PerNs::values(def, v),
ModuleDefId::TraitId(_) => PerNs::types(def, v),
ModuleDefId::TypeAliasId(_) => PerNs::types(def, v),
ModuleDefId::BuiltinType(_) => PerNs::types(def, v),
}
}
}
#[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
pub enum ItemInNs {
Types(ModuleDefId),
Values(ModuleDefId),
Macros(MacroDefId),
}
impl ItemInNs {
fn match_with(self, per_ns: PerNs) -> Option<Visibility> {
match self {
ItemInNs::Types(def) => {
per_ns.types.filter(|(other_def, _)| *other_def == def).map(|(_, vis)| vis)
}
ItemInNs::Values(def) => {
per_ns.values.filter(|(other_def, _)| *other_def == def).map(|(_, vis)| vis)
}
ItemInNs::Macros(def) => {
per_ns.macros.filter(|(other_def, _)| *other_def == def).map(|(_, vis)| vis)
}
}
}
pub fn as_module_def_id(self) -> Option<ModuleDefId> {
match self {
ItemInNs::Types(id) | ItemInNs::Values(id) => Some(id),
ItemInNs::Macros(_) => None,
}
}
}
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