371 lines
13 KiB
Rust
371 lines
13 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::{iter::once, sync::Arc};
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use hir_def::{
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body::{
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scope::{ExprScopes, ScopeId},
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Body, BodySourceMap,
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},
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expr::{ExprId, Pat, PatId},
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resolver::{resolver_for_scope, Resolver, TypeNs, ValueNs},
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AsMacroCall, DefWithBodyId,
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};
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use hir_expand::{hygiene::Hygiene, name::AsName, HirFileId, InFile};
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use hir_ty::InferenceResult;
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use ra_syntax::{
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ast::{self, AstNode},
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SyntaxNode, SyntaxNodePtr, TextUnit,
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};
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use crate::{
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db::HirDatabase, semantics::PathResolution, Adt, Const, EnumVariant, Function, Local, MacroDef,
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ModPath, ModuleDef, Path, PathKind, Static, Struct, Trait, Type, TypeAlias, TypeParam,
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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(crate) struct SourceAnalyzer {
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file_id: HirFileId,
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pub(crate) resolver: Resolver,
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body: Option<Arc<Body>>,
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body_source_map: Option<Arc<BodySourceMap>>,
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infer: Option<Arc<InferenceResult>>,
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scopes: Option<Arc<ExprScopes>>,
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}
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impl SourceAnalyzer {
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pub(crate) fn new_for_body(
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db: &dyn HirDatabase,
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def: DefWithBodyId,
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node: InFile<&SyntaxNode>,
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offset: Option<TextUnit>,
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) -> SourceAnalyzer {
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let (body, source_map) = db.body_with_source_map(def);
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let scopes = db.expr_scopes(def);
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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.upcast(), def, scope);
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SourceAnalyzer {
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resolver,
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body: Some(body),
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body_source_map: Some(source_map),
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infer: Some(db.infer(def)),
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scopes: Some(scopes),
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file_id: node.file_id,
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}
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}
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pub(crate) fn new_for_resolver(
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resolver: Resolver,
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node: InFile<&SyntaxNode>,
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) -> SourceAnalyzer {
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SourceAnalyzer {
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resolver,
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body: 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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fn expr_id(&self, db: &dyn HirDatabase, expr: &ast::Expr) -> Option<ExprId> {
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let src = match expr {
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ast::Expr::MacroCall(call) => {
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self.expand_expr(db, InFile::new(self.file_id, call.clone()))?
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}
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_ => InFile::new(self.file_id, expr.clone()),
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};
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let sm = self.body_source_map.as_ref()?;
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sm.node_expr(src.as_ref())
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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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fn expand_expr(
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&self,
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db: &dyn HirDatabase,
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expr: InFile<ast::MacroCall>,
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) -> Option<InFile<ast::Expr>> {
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let macro_file = self.body_source_map.as_ref()?.node_macro_file(expr.as_ref())?;
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let expanded = db.parse_or_expand(macro_file)?;
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let res = match ast::MacroCall::cast(expanded.clone()) {
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Some(call) => self.expand_expr(db, InFile::new(macro_file, call))?,
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_ => InFile::new(macro_file, ast::Expr::cast(expanded)?),
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};
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Some(res)
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}
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pub(crate) fn type_of(&self, db: &dyn HirDatabase, expr: &ast::Expr) -> Option<Type> {
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let expr_id = self.expr_id(db, expr)?;
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let ty = self.infer.as_ref()?[expr_id].clone();
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Type::new_with_resolver(db, &self.resolver, ty)
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}
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pub(crate) fn type_of_pat(&self, db: &dyn 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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Type::new_with_resolver(db, &self.resolver, ty)
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}
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pub(crate) fn resolve_method_call(
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&self,
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db: &dyn HirDatabase,
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call: &ast::MethodCallExpr,
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) -> Option<Function> {
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let expr_id = self.expr_id(db, &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(crate) fn resolve_field(
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&self,
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db: &dyn HirDatabase,
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field: &ast::FieldExpr,
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) -> Option<crate::StructField> {
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let expr_id = self.expr_id(db, &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(crate) fn resolve_record_field(
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&self,
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db: &dyn HirDatabase,
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field: &ast::RecordField,
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) -> Option<(crate::StructField, Option<Local>)> {
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let (expr_id, local) = match field.expr() {
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Some(it) => (self.expr_id(db, &it)?, None),
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None => {
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let src = InFile { file_id: self.file_id, value: field };
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let expr_id = self.body_source_map.as_ref()?.field_init_shorthand_expr(src)?;
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let local_name = field.name_ref()?.as_name();
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let path = ModPath::from_segments(PathKind::Plain, once(local_name));
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let local = match self.resolver.resolve_path_in_value_ns_fully(db.upcast(), &path) {
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Some(ValueNs::LocalBinding(pat_id)) => {
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Some(Local { pat_id, parent: self.resolver.body_owner()? })
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}
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_ => None,
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};
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(expr_id, local)
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}
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};
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let struct_field = self.infer.as_ref()?.record_field_resolution(expr_id)?;
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Some((struct_field.into(), local))
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}
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pub(crate) fn resolve_record_literal(
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&self,
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db: &dyn HirDatabase,
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record_lit: &ast::RecordLit,
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) -> Option<crate::VariantDef> {
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let expr_id = self.expr_id(db, &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(crate) fn resolve_record_pattern(
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&self,
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record_pat: &ast::RecordPat,
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) -> 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(crate) fn resolve_macro_call(
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&self,
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db: &dyn 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.upcast(), 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.upcast(), path.mod_path()).map(|it| it.into())
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}
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pub(crate) fn resolve_bind_pat_to_const(
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&self,
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db: &dyn HirDatabase,
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pat: &ast::BindPat,
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) -> Option<ModuleDef> {
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let pat_id = self.pat_id(&pat.clone().into())?;
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let body = self.body.as_ref()?;
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let path = match &body[pat_id] {
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Pat::Path(path) => path,
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_ => return None,
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};
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let res = resolve_hir_path(db, &self.resolver, &path)?;
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match res {
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PathResolution::Def(def) => Some(def),
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_ => None,
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}
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}
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pub(crate) fn resolve_path(
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&self,
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db: &dyn HirDatabase,
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path: &ast::Path,
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) -> 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(db, &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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resolve_hir_path(db, &self.resolver, &hir_path)
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}
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pub(crate) fn expand(
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&self,
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db: &dyn HirDatabase,
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macro_call: InFile<&ast::MacroCall>,
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) -> Option<HirFileId> {
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let macro_call_id = macro_call.as_call_id(db.upcast(), |path| {
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self.resolver.resolve_path_as_macro(db.upcast(), &path)
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})?;
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Some(macro_call_id.as_file())
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}
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}
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fn scope_for(
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scopes: &ExprScopes,
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source_map: &BodySourceMap,
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node: InFile<&SyntaxNode>,
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) -> Option<ScopeId> {
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node.value
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.ancestors()
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.filter_map(ast::Expr::cast)
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.filter_map(|it| source_map.node_expr(InFile::new(node.file_id, &it)))
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.find_map(|it| scopes.scope_for(it))
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}
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fn scope_for_offset(
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scopes: &ExprScopes,
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source_map: &BodySourceMap,
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offset: InFile<TextUnit>,
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) -> Option<ScopeId> {
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scopes
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.scope_by_expr()
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.iter()
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.filter_map(|(id, scope)| {
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let source = source_map.expr_syntax(*id).ok()?;
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// FIXME: correctly handle macro expansion
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if source.file_id != offset.file_id {
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return None;
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}
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let syntax_node_ptr =
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source.value.either(|it| it.syntax_node_ptr(), |it| it.syntax_node_ptr());
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Some((syntax_node_ptr, scope))
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})
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// find containing scope
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.min_by_key(|(ptr, _scope)| {
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(
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!(ptr.range().start() <= offset.value && offset.value <= ptr.range().end()),
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ptr.range().len(),
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)
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})
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.map(|(ptr, scope)| {
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adjust(scopes, source_map, ptr, offset.file_id, offset.value).unwrap_or(*scope)
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})
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}
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pub(crate) fn resolve_hir_path(
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db: &dyn HirDatabase,
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resolver: &Resolver,
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path: &crate::Path,
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) -> Option<PathResolution> {
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let types =
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resolver.resolve_path_in_type_ns_fully(db.upcast(), path.mod_path()).map(|ty| match ty {
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TypeNs::SelfType(it) => PathResolution::SelfType(it.into()),
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TypeNs::GenericParam(id) => PathResolution::TypeParam(TypeParam { id }),
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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 body_owner = resolver.body_owner();
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let values =
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resolver.resolve_path_in_value_ns_fully(db.upcast(), path.mod_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: body_owner?.into(), 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 = resolver
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.resolve_module_path_in_items(db.upcast(), path.mod_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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resolver
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.resolve_path_as_macro(db.upcast(), path.mod_path())
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.map(|def| PathResolution::Macro(def.into()))
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})
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}
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// XXX: during completion, cursor might be outside of any particular
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// expression. Try to figure out the correct scope...
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fn adjust(
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scopes: &ExprScopes,
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source_map: &BodySourceMap,
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ptr: SyntaxNodePtr,
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file_id: HirFileId,
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offset: TextUnit,
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) -> Option<ScopeId> {
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let r = ptr.range();
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let child_scopes = scopes
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.scope_by_expr()
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.iter()
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.filter_map(|(id, scope)| {
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let source = source_map.expr_syntax(*id).ok()?;
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// FIXME: correctly handle macro expansion
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if source.file_id != file_id {
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return None;
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}
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let syntax_node_ptr =
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source.value.either(|it| it.syntax_node_ptr(), |it| it.syntax_node_ptr());
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Some((syntax_node_ptr, scope))
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})
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.map(|(ptr, scope)| (ptr.range(), scope))
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.filter(|(range, _)| range.start() <= offset && range.is_subrange(&r) && *range != r);
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child_scopes
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.max_by(|(r1, _), (r2, _)| {
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if r2.is_subrange(&r1) {
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std::cmp::Ordering::Greater
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} else if r1.is_subrange(&r2) {
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std::cmp::Ordering::Less
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} else {
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r1.start().cmp(&r2.start())
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}
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})
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.map(|(_ptr, scope)| *scope)
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}
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