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https://github.com/rust-lang/rust-analyzer
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58 lines
2.3 KiB
Rust
58 lines
2.3 KiB
Rust
//! keys to be used with `DynMap`
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use std::marker::PhantomData;
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use hir_expand::{InFile, MacroDefId};
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use ra_syntax::{ast, AstNode, AstPtr};
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use rustc_hash::FxHashMap;
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use crate::{
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dyn_map::{DynMap, Policy},
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ConstId, EnumId, EnumVariantId, FieldId, FunctionId, ImplId, StaticId, StructId, TraitId,
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TypeAliasId, TypeParamId, UnionId,
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};
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pub type Key<K, V> = crate::dyn_map::Key<InFile<K>, V, AstPtrPolicy<K, V>>;
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pub const FUNCTION: Key<ast::FnDef, FunctionId> = Key::new();
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pub const CONST: Key<ast::ConstDef, ConstId> = Key::new();
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pub const STATIC: Key<ast::StaticDef, StaticId> = Key::new();
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pub const TYPE_ALIAS: Key<ast::TypeAliasDef, TypeAliasId> = Key::new();
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pub const IMPL: Key<ast::ImplDef, ImplId> = Key::new();
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pub const TRAIT: Key<ast::TraitDef, TraitId> = Key::new();
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pub const STRUCT: Key<ast::StructDef, StructId> = Key::new();
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pub const UNION: Key<ast::UnionDef, UnionId> = Key::new();
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pub const ENUM: Key<ast::EnumDef, EnumId> = Key::new();
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pub const ENUM_VARIANT: Key<ast::EnumVariant, EnumVariantId> = Key::new();
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pub const TUPLE_FIELD: Key<ast::TupleFieldDef, FieldId> = Key::new();
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pub const RECORD_FIELD: Key<ast::RecordFieldDef, FieldId> = Key::new();
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pub const TYPE_PARAM: Key<ast::TypeParam, TypeParamId> = Key::new();
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pub const MACRO: Key<ast::MacroCall, MacroDefId> = 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 = InFile<AST>;
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type V = ID;
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fn insert(map: &mut DynMap, key: InFile<AST>, value: ID) {
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let key = key.as_ref().map(AstPtr::new);
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map.map
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.entry::<FxHashMap<InFile<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: &InFile<AST>) -> Option<&'a ID> {
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let key = key.as_ref().map(AstPtr::new);
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map.map.get::<FxHashMap<InFile<AstPtr<AST>>, ID>>()?.get(&key)
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}
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}
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