68 lines
2.7 KiB
Rust
68 lines
2.7 KiB
Rust
//! keys to be used with `DynMap`
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use std::marker::PhantomData;
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use hir_expand::{MacroCallId, MacroDefId};
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use rustc_hash::FxHashMap;
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use syntax::{ast, AstNode, AstPtr};
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use crate::{
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attr::AttrId,
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dyn_map::{DynMap, Policy},
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ConstId, ConstParamId, EnumId, EnumVariantId, FieldId, FunctionId, ImplId, LifetimeParamId,
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StaticId, StructId, TraitId, TypeAliasId, TypeParamId, UnionId,
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};
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pub type Key<K, V> = crate::dyn_map::Key<K, V, AstPtrPolicy<K, V>>;
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pub const FUNCTION: Key<ast::Fn, FunctionId> = Key::new();
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pub const CONST: Key<ast::Const, ConstId> = Key::new();
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pub const STATIC: Key<ast::Static, StaticId> = Key::new();
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pub const TYPE_ALIAS: Key<ast::TypeAlias, TypeAliasId> = Key::new();
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pub const IMPL: Key<ast::Impl, ImplId> = Key::new();
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pub const TRAIT: Key<ast::Trait, TraitId> = Key::new();
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pub const STRUCT: Key<ast::Struct, StructId> = Key::new();
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pub const UNION: Key<ast::Union, UnionId> = Key::new();
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pub const ENUM: Key<ast::Enum, EnumId> = Key::new();
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pub const VARIANT: Key<ast::Variant, EnumVariantId> = Key::new();
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pub const TUPLE_FIELD: Key<ast::TupleField, FieldId> = Key::new();
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pub const RECORD_FIELD: Key<ast::RecordField, FieldId> = Key::new();
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pub const TYPE_PARAM: Key<ast::TypeParam, TypeParamId> = Key::new();
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pub const LIFETIME_PARAM: Key<ast::LifetimeParam, LifetimeParamId> = Key::new();
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pub const CONST_PARAM: Key<ast::ConstParam, ConstParamId> = Key::new();
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pub const MACRO: Key<ast::Macro, MacroDefId> = Key::new();
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pub const ATTR_MACRO_CALL: Key<ast::Item, MacroCallId> = Key::new();
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pub const DERIVE_MACRO_CALL: Key<ast::Attr, (AttrId, MacroCallId, Box<[Option<MacroCallId>]>)> =
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Key::new();
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/// XXX: AST Nodes and SyntaxNodes have identity equality semantics: nodes are
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/// equal if they point to exactly the same object.
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///
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/// In general, we do not guarantee that we have exactly one instance of a
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/// syntax tree for each file. We probably should add such guarantee, but, for
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/// the time being, we will use identity-less AstPtr comparison.
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pub struct AstPtrPolicy<AST, ID> {
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_phantom: PhantomData<(AST, ID)>,
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}
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impl<AST: AstNode + 'static, ID: 'static> Policy for AstPtrPolicy<AST, ID> {
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type K = AST;
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type V = ID;
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fn insert(map: &mut DynMap, key: AST, value: ID) {
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let key = AstPtr::new(&key);
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map.map
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.entry::<FxHashMap<AstPtr<AST>, ID>>()
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.or_insert_with(Default::default)
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.insert(key, value);
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}
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fn get<'a>(map: &'a DynMap, key: &AST) -> Option<&'a ID> {
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let key = AstPtr::new(key);
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map.map.get::<FxHashMap<AstPtr<AST>, ID>>()?.get(&key)
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}
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fn is_empty(map: &DynMap) -> bool {
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map.map.get::<FxHashMap<AstPtr<AST>, ID>>().map_or(true, |it| it.is_empty())
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}
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}
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