578 lines
21 KiB
Rust
578 lines
21 KiB
Rust
//! Lookup hir elements using positions in the source code. This is a lossy
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//! transformation: in general, a single source might correspond to several
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//! modules, functions, etc, due to macros, cfgs and `#[path=]` attributes on
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//! modules.
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//!
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//! So, this modules should not be used during hir construction, it exists
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//! purely for "IDE needs".
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use std::sync::Arc;
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use either::Either;
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use hir_def::{
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body::{
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scope::{ExprScopes, ScopeId},
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BodySourceMap,
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},
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expr::{ExprId, PatId},
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nameres::ModuleSource,
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path::known,
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resolver::{self, resolver_for_scope, HasResolver, Resolver, TypeNs, ValueNs},
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AssocItemId, DefWithBodyId,
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};
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use hir_expand::{
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hygiene::Hygiene, name::AsName, AstId, HirFileId, InFile, MacroCallId, MacroCallKind,
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MacroFileKind,
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};
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use ra_syntax::{
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ast::{self, AstNode},
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match_ast, AstPtr,
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SyntaxKind::*,
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SyntaxNode, SyntaxNodePtr, SyntaxToken, TextRange, TextUnit,
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};
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use crate::{
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db::HirDatabase,
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ty::{
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method_resolution::{self, implements_trait},
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InEnvironment, TraitEnvironment, Ty,
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},
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Adt, AssocItem, Const, DefWithBody, Enum, EnumVariant, FromSource, Function, GenericParam,
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Local, MacroDef, Name, Path, ScopeDef, Static, Struct, Trait, Type, TypeAlias,
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};
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fn try_get_resolver_for_node(db: &impl HirDatabase, node: InFile<&SyntaxNode>) -> Option<Resolver> {
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match_ast! {
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match (node.value) {
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ast::Module(it) => {
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let src = node.with_value(it);
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Some(crate::Module::from_declaration(db, src)?.id.resolver(db))
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},
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ast::SourceFile(it) => {
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let src = node.with_value(ModuleSource::SourceFile(it));
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Some(crate::Module::from_definition(db, src)?.id.resolver(db))
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},
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ast::StructDef(it) => {
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let src = node.with_value(it);
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Some(Struct::from_source(db, src)?.id.resolver(db))
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},
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ast::EnumDef(it) => {
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let src = node.with_value(it);
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Some(Enum::from_source(db, src)?.id.resolver(db))
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},
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_ => match node.value.kind() {
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FN_DEF | CONST_DEF | STATIC_DEF => {
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let def = def_with_body_from_child_node(db, node)?;
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let def = DefWithBodyId::from(def);
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Some(def.resolver(db))
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}
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// FIXME add missing cases
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_ => None
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}
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}
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}
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}
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fn def_with_body_from_child_node(
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db: &impl HirDatabase,
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child: InFile<&SyntaxNode>,
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) -> Option<DefWithBody> {
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child.value.ancestors().find_map(|node| {
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match_ast! {
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match node {
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ast::FnDef(def) => { return Function::from_source(db, child.with_value(def)).map(DefWithBody::from); },
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ast::ConstDef(def) => { return Const::from_source(db, child.with_value(def)).map(DefWithBody::from); },
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ast::StaticDef(def) => { return Static::from_source(db, child.with_value(def)).map(DefWithBody::from); },
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_ => { None },
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}
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}
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})
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}
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/// `SourceAnalyzer` is a convenience wrapper which exposes HIR API in terms of
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/// original source files. It should not be used inside the HIR itself.
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#[derive(Debug)]
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pub struct SourceAnalyzer {
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file_id: HirFileId,
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resolver: Resolver,
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body_owner: Option<DefWithBody>,
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body_source_map: Option<Arc<BodySourceMap>>,
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infer: Option<Arc<crate::ty::InferenceResult>>,
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scopes: Option<Arc<ExprScopes>>,
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}
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub enum PathResolution {
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/// An item
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Def(crate::ModuleDef),
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/// A local binding (only value namespace)
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Local(Local),
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/// A generic parameter
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GenericParam(GenericParam),
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SelfType(crate::ImplBlock),
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Macro(MacroDef),
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AssocItem(crate::AssocItem),
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}
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct ScopeEntryWithSyntax {
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pub(crate) name: Name,
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pub(crate) ptr: Either<AstPtr<ast::Pat>, AstPtr<ast::SelfParam>>,
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}
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impl ScopeEntryWithSyntax {
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pub fn name(&self) -> &Name {
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&self.name
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}
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pub fn ptr(&self) -> Either<AstPtr<ast::Pat>, AstPtr<ast::SelfParam>> {
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self.ptr
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}
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}
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#[derive(Debug)]
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pub struct ReferenceDescriptor {
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pub range: TextRange,
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pub name: String,
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}
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pub struct Expansion {
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macro_file_kind: MacroFileKind,
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macro_call_id: MacroCallId,
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}
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impl Expansion {
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pub fn map_token_down(
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&self,
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db: &impl HirDatabase,
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token: InFile<&SyntaxToken>,
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) -> Option<InFile<SyntaxToken>> {
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let exp_info = self.file_id().expansion_info(db)?;
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exp_info.map_token_down(token)
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}
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pub fn file_id(&self) -> HirFileId {
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self.macro_call_id.as_file(self.macro_file_kind)
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}
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}
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impl SourceAnalyzer {
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pub fn new(
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db: &impl HirDatabase,
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node: InFile<&SyntaxNode>,
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offset: Option<TextUnit>,
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) -> SourceAnalyzer {
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let def_with_body = def_with_body_from_child_node(db, node);
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if let Some(def) = def_with_body {
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let (_body, source_map) = db.body_with_source_map(def.into());
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let scopes = db.expr_scopes(def.into());
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let scope = match offset {
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None => scope_for(&scopes, &source_map, node),
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Some(offset) => scope_for_offset(&scopes, &source_map, node.with_value(offset)),
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};
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let resolver = resolver_for_scope(db, def.into(), scope);
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SourceAnalyzer {
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resolver,
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body_owner: Some(def),
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body_source_map: Some(source_map),
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infer: Some(db.infer(def.into())),
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scopes: Some(scopes),
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file_id: node.file_id,
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}
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} else {
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SourceAnalyzer {
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resolver: node
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.value
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.ancestors()
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.find_map(|it| try_get_resolver_for_node(db, node.with_value(&it)))
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.unwrap_or_default(),
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body_owner: None,
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body_source_map: None,
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infer: None,
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scopes: None,
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file_id: node.file_id,
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}
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}
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}
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fn expr_id(&self, expr: &ast::Expr) -> Option<ExprId> {
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let src = InFile { file_id: self.file_id, value: expr };
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self.body_source_map.as_ref()?.node_expr(src)
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}
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fn pat_id(&self, pat: &ast::Pat) -> Option<PatId> {
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let src = InFile { file_id: self.file_id, value: pat };
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self.body_source_map.as_ref()?.node_pat(src)
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}
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pub fn type_of(&self, db: &impl HirDatabase, expr: &ast::Expr) -> Option<Type> {
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let expr_id = self.expr_id(expr)?;
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let ty = self.infer.as_ref()?[expr_id].clone();
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let environment = TraitEnvironment::lower(db, &self.resolver);
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Some(Type { krate: self.resolver.krate()?, ty: InEnvironment { value: ty, environment } })
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}
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pub fn type_of_pat(&self, db: &impl HirDatabase, pat: &ast::Pat) -> Option<Type> {
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let pat_id = self.pat_id(pat)?;
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let ty = self.infer.as_ref()?[pat_id].clone();
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let environment = TraitEnvironment::lower(db, &self.resolver);
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Some(Type { krate: self.resolver.krate()?, ty: InEnvironment { value: ty, environment } })
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}
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pub fn resolve_method_call(&self, call: &ast::MethodCallExpr) -> Option<Function> {
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let expr_id = self.expr_id(&call.clone().into())?;
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self.infer.as_ref()?.method_resolution(expr_id).map(Function::from)
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}
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pub fn resolve_field(&self, field: &ast::FieldExpr) -> Option<crate::StructField> {
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let expr_id = self.expr_id(&field.clone().into())?;
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self.infer.as_ref()?.field_resolution(expr_id).map(|it| it.into())
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}
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pub fn resolve_record_field(&self, field: &ast::RecordField) -> Option<crate::StructField> {
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let expr_id = self.expr_id(&field.expr()?)?;
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self.infer.as_ref()?.record_field_resolution(expr_id).map(|it| it.into())
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}
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pub fn resolve_record_literal(&self, record_lit: &ast::RecordLit) -> Option<crate::VariantDef> {
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let expr_id = self.expr_id(&record_lit.clone().into())?;
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self.infer.as_ref()?.variant_resolution_for_expr(expr_id).map(|it| it.into())
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}
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pub fn resolve_record_pattern(&self, record_pat: &ast::RecordPat) -> Option<crate::VariantDef> {
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let pat_id = self.pat_id(&record_pat.clone().into())?;
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self.infer.as_ref()?.variant_resolution_for_pat(pat_id).map(|it| it.into())
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}
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pub fn resolve_macro_call(
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&self,
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db: &impl HirDatabase,
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macro_call: InFile<&ast::MacroCall>,
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) -> Option<MacroDef> {
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let hygiene = Hygiene::new(db, macro_call.file_id);
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let path = macro_call.value.path().and_then(|ast| Path::from_src(ast, &hygiene))?;
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self.resolver.resolve_path_as_macro(db, &path).map(|it| it.into())
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}
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pub fn resolve_hir_path(
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&self,
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db: &impl HirDatabase,
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path: &crate::Path,
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) -> Option<PathResolution> {
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let types = self.resolver.resolve_path_in_type_ns_fully(db, &path).map(|ty| match ty {
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TypeNs::SelfType(it) => PathResolution::SelfType(it.into()),
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TypeNs::GenericParam(idx) => PathResolution::GenericParam(GenericParam {
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parent: self.resolver.generic_def().unwrap(),
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idx,
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}),
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TypeNs::AdtSelfType(it) | TypeNs::AdtId(it) => {
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PathResolution::Def(Adt::from(it).into())
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}
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TypeNs::EnumVariantId(it) => PathResolution::Def(EnumVariant::from(it).into()),
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TypeNs::TypeAliasId(it) => PathResolution::Def(TypeAlias::from(it).into()),
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TypeNs::BuiltinType(it) => PathResolution::Def(it.into()),
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TypeNs::TraitId(it) => PathResolution::Def(Trait::from(it).into()),
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});
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let values = self.resolver.resolve_path_in_value_ns_fully(db, &path).and_then(|val| {
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let res = match val {
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ValueNs::LocalBinding(pat_id) => {
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let var = Local { parent: self.body_owner?, pat_id };
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PathResolution::Local(var)
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}
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ValueNs::FunctionId(it) => PathResolution::Def(Function::from(it).into()),
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ValueNs::ConstId(it) => PathResolution::Def(Const::from(it).into()),
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ValueNs::StaticId(it) => PathResolution::Def(Static::from(it).into()),
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ValueNs::StructId(it) => PathResolution::Def(Struct::from(it).into()),
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ValueNs::EnumVariantId(it) => PathResolution::Def(EnumVariant::from(it).into()),
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};
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Some(res)
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});
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let items = self
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.resolver
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.resolve_module_path_in_items(db, &path)
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.take_types()
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.map(|it| PathResolution::Def(it.into()));
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types.or(values).or(items).or_else(|| {
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self.resolver
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.resolve_path_as_macro(db, &path)
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.map(|def| PathResolution::Macro(def.into()))
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})
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}
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pub fn resolve_path(&self, db: &impl HirDatabase, path: &ast::Path) -> Option<PathResolution> {
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if let Some(path_expr) = path.syntax().parent().and_then(ast::PathExpr::cast) {
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let expr_id = self.expr_id(&path_expr.into())?;
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if let Some(assoc) = self.infer.as_ref()?.assoc_resolutions_for_expr(expr_id) {
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return Some(PathResolution::AssocItem(assoc.into()));
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}
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}
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if let Some(path_pat) = path.syntax().parent().and_then(ast::PathPat::cast) {
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let pat_id = self.pat_id(&path_pat.into())?;
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if let Some(assoc) = self.infer.as_ref()?.assoc_resolutions_for_pat(pat_id) {
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return Some(PathResolution::AssocItem(assoc.into()));
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}
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}
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// This must be a normal source file rather than macro file.
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let hir_path = crate::Path::from_ast(path.clone())?;
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self.resolve_hir_path(db, &hir_path)
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}
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fn resolve_local_name(&self, name_ref: &ast::NameRef) -> Option<ScopeEntryWithSyntax> {
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let name = name_ref.as_name();
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let source_map = self.body_source_map.as_ref()?;
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let scopes = self.scopes.as_ref()?;
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let scope = scope_for(scopes, source_map, InFile::new(self.file_id, name_ref.syntax()))?;
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let entry = scopes.resolve_name_in_scope(scope, &name)?;
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Some(ScopeEntryWithSyntax {
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name: entry.name().clone(),
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ptr: source_map.pat_syntax(entry.pat())?.value,
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})
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}
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pub fn process_all_names(&self, db: &impl HirDatabase, f: &mut dyn FnMut(Name, ScopeDef)) {
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self.resolver.process_all_names(db, &mut |name, def| {
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let def = match def {
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resolver::ScopeDef::PerNs(it) => it.into(),
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resolver::ScopeDef::ImplSelfType(it) => ScopeDef::ImplSelfType(it.into()),
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resolver::ScopeDef::AdtSelfType(it) => ScopeDef::AdtSelfType(it.into()),
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resolver::ScopeDef::GenericParam(idx) => {
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let parent = self.resolver.generic_def().unwrap();
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ScopeDef::GenericParam(GenericParam { parent, idx })
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}
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resolver::ScopeDef::Local(pat_id) => {
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let parent = self.resolver.body_owner().unwrap().into();
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ScopeDef::Local(Local { parent, pat_id })
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}
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};
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f(name, def)
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})
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}
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// FIXME: we only use this in `inline_local_variable` assist, ideally, we
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// should switch to general reference search infra there.
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pub fn find_all_refs(&self, pat: &ast::BindPat) -> Vec<ReferenceDescriptor> {
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let fn_def = pat.syntax().ancestors().find_map(ast::FnDef::cast).unwrap();
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let ptr = Either::Left(AstPtr::new(&ast::Pat::from(pat.clone())));
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fn_def
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.syntax()
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.descendants()
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.filter_map(ast::NameRef::cast)
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.filter(|name_ref| match self.resolve_local_name(&name_ref) {
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None => false,
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Some(entry) => entry.ptr() == ptr,
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})
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.map(|name_ref| ReferenceDescriptor {
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name: name_ref.text().to_string(),
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range: name_ref.syntax().text_range(),
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})
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.collect()
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}
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pub fn iterate_method_candidates<T>(
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&self,
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db: &impl HirDatabase,
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ty: &Type,
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name: Option<&Name>,
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mut callback: impl FnMut(&Ty, Function) -> Option<T>,
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) -> Option<T> {
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// There should be no inference vars in types passed here
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// FIXME check that?
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// FIXME replace Unknown by bound vars here
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let canonical = crate::ty::Canonical { value: ty.ty.value.clone(), num_vars: 0 };
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method_resolution::iterate_method_candidates(
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&canonical,
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db,
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&self.resolver,
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name,
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method_resolution::LookupMode::MethodCall,
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|ty, it| match it {
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AssocItemId::FunctionId(f) => callback(ty, f.into()),
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_ => None,
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},
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)
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}
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pub fn iterate_path_candidates<T>(
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&self,
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db: &impl HirDatabase,
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ty: &Type,
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name: Option<&Name>,
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mut callback: impl FnMut(&Ty, AssocItem) -> Option<T>,
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) -> Option<T> {
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// There should be no inference vars in types passed here
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// FIXME check that?
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// FIXME replace Unknown by bound vars here
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let canonical = crate::ty::Canonical { value: ty.ty.value.clone(), num_vars: 0 };
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method_resolution::iterate_method_candidates(
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&canonical,
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db,
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&self.resolver,
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name,
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method_resolution::LookupMode::Path,
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|ty, it| callback(ty, it.into()),
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)
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}
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// pub fn autoderef<'a>(
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// &'a self,
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// db: &'a impl HirDatabase,
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// ty: Ty,
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// ) -> impl Iterator<Item = Ty> + 'a {
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// // There should be no inference vars in types passed here
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// // FIXME check that?
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// let canonical = crate::ty::Canonical { value: ty, num_vars: 0 };
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// let krate = self.resolver.krate();
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// let environment = TraitEnvironment::lower(db, &self.resolver);
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// let ty = crate::ty::InEnvironment { value: canonical, environment };
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// crate::ty::autoderef(db, krate, ty).map(|canonical| canonical.value)
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// }
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/// Checks that particular type `ty` implements `std::future::Future`.
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/// This function is used in `.await` syntax completion.
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pub fn impls_future(&self, db: &impl HirDatabase, ty: Ty) -> bool {
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let std_future_path = known::std_future_future();
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let std_future_trait = match self.resolver.resolve_known_trait(db, &std_future_path) {
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Some(it) => it.into(),
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_ => return false,
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};
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let krate = match self.resolver.krate() {
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Some(krate) => krate,
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_ => return false,
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};
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let canonical_ty = crate::ty::Canonical { value: ty, num_vars: 0 };
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implements_trait(&canonical_ty, db, &self.resolver, krate.into(), std_future_trait)
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}
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pub fn expand(
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&self,
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db: &impl HirDatabase,
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macro_call: InFile<&ast::MacroCall>,
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) -> Option<Expansion> {
|
|
let def = self.resolve_macro_call(db, macro_call)?.id;
|
|
let ast_id = AstId::new(
|
|
macro_call.file_id,
|
|
db.ast_id_map(macro_call.file_id).ast_id(macro_call.value),
|
|
);
|
|
Some(Expansion {
|
|
macro_call_id: def.as_call_id(db, MacroCallKind::FnLike(ast_id)),
|
|
macro_file_kind: to_macro_file_kind(macro_call.value),
|
|
})
|
|
}
|
|
}
|
|
|
|
fn scope_for(
|
|
scopes: &ExprScopes,
|
|
source_map: &BodySourceMap,
|
|
node: InFile<&SyntaxNode>,
|
|
) -> Option<ScopeId> {
|
|
node.value
|
|
.ancestors()
|
|
.filter_map(ast::Expr::cast)
|
|
.filter_map(|it| source_map.node_expr(InFile::new(node.file_id, &it)))
|
|
.find_map(|it| scopes.scope_for(it))
|
|
}
|
|
|
|
fn scope_for_offset(
|
|
scopes: &ExprScopes,
|
|
source_map: &BodySourceMap,
|
|
offset: InFile<TextUnit>,
|
|
) -> Option<ScopeId> {
|
|
scopes
|
|
.scope_by_expr()
|
|
.iter()
|
|
.filter_map(|(id, scope)| {
|
|
let source = source_map.expr_syntax(*id)?;
|
|
// FIXME: correctly handle macro expansion
|
|
if source.file_id != offset.file_id {
|
|
return None;
|
|
}
|
|
let syntax_node_ptr =
|
|
source.value.either(|it| it.syntax_node_ptr(), |it| it.syntax_node_ptr());
|
|
Some((syntax_node_ptr, scope))
|
|
})
|
|
// find containing scope
|
|
.min_by_key(|(ptr, _scope)| {
|
|
(
|
|
!(ptr.range().start() <= offset.value && offset.value <= ptr.range().end()),
|
|
ptr.range().len(),
|
|
)
|
|
})
|
|
.map(|(ptr, scope)| {
|
|
adjust(scopes, source_map, ptr, offset.file_id, offset.value).unwrap_or(*scope)
|
|
})
|
|
}
|
|
|
|
// XXX: during completion, cursor might be outside of any particular
|
|
// expression. Try to figure out the correct scope...
|
|
fn adjust(
|
|
scopes: &ExprScopes,
|
|
source_map: &BodySourceMap,
|
|
ptr: SyntaxNodePtr,
|
|
file_id: HirFileId,
|
|
offset: TextUnit,
|
|
) -> Option<ScopeId> {
|
|
let r = ptr.range();
|
|
let child_scopes = scopes
|
|
.scope_by_expr()
|
|
.iter()
|
|
.filter_map(|(id, scope)| {
|
|
let source = source_map.expr_syntax(*id)?;
|
|
// FIXME: correctly handle macro expansion
|
|
if source.file_id != file_id {
|
|
return None;
|
|
}
|
|
let syntax_node_ptr =
|
|
source.value.either(|it| it.syntax_node_ptr(), |it| it.syntax_node_ptr());
|
|
Some((syntax_node_ptr, scope))
|
|
})
|
|
.map(|(ptr, scope)| (ptr.range(), scope))
|
|
.filter(|(range, _)| range.start() <= offset && range.is_subrange(&r) && *range != r);
|
|
|
|
child_scopes
|
|
.max_by(|(r1, _), (r2, _)| {
|
|
if r2.is_subrange(&r1) {
|
|
std::cmp::Ordering::Greater
|
|
} else if r1.is_subrange(&r2) {
|
|
std::cmp::Ordering::Less
|
|
} else {
|
|
r1.start().cmp(&r2.start())
|
|
}
|
|
})
|
|
.map(|(_ptr, scope)| *scope)
|
|
}
|
|
|
|
/// Given a `ast::MacroCall`, return what `MacroKindFile` it belongs to.
|
|
/// FIXME: Not completed
|
|
fn to_macro_file_kind(macro_call: &ast::MacroCall) -> MacroFileKind {
|
|
let syn = macro_call.syntax();
|
|
let parent = match syn.parent() {
|
|
Some(it) => it,
|
|
None => {
|
|
// FIXME:
|
|
// If it is root, which means the parent HirFile
|
|
// MacroKindFile must be non-items
|
|
// return expr now.
|
|
return MacroFileKind::Expr;
|
|
}
|
|
};
|
|
|
|
match parent.kind() {
|
|
MACRO_ITEMS | SOURCE_FILE => MacroFileKind::Items,
|
|
LET_STMT => {
|
|
// FIXME: Handle Pattern
|
|
MacroFileKind::Expr
|
|
}
|
|
EXPR_STMT => MacroFileKind::Statements,
|
|
BLOCK => MacroFileKind::Statements,
|
|
ARG_LIST => MacroFileKind::Expr,
|
|
TRY_EXPR => MacroFileKind::Expr,
|
|
_ => {
|
|
// Unknown , Just guess it is `Items`
|
|
MacroFileKind::Items
|
|
}
|
|
}
|
|
}
|