2019-09-30 03:58:53 -05:00
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//! 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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2020-03-02 12:00:38 -06:00
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use std::{iter::once, sync::Arc};
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2019-04-10 03:15:55 -05:00
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2019-11-14 01:30:30 -06:00
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use hir_def::{
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2019-11-27 08:46:02 -06:00
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body::{
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scope::{ExprScopes, ScopeId},
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2020-02-28 09:36:14 -06:00
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Body, BodySourceMap,
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2019-11-27 08:46:02 -06:00
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},
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2020-02-28 09:36:14 -06:00
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expr::{ExprId, Pat, PatId},
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2020-02-18 11:35:10 -06:00
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resolver::{resolver_for_scope, Resolver, TypeNs, ValueNs},
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AsMacroCall, DefWithBodyId,
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2019-11-14 01:30:30 -06:00
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};
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2020-02-18 11:35:10 -06:00
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use hir_expand::{hygiene::Hygiene, name::AsName, HirFileId, InFile};
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2020-01-14 07:42:52 -06:00
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use hir_ty::{InEnvironment, InferenceResult, TraitEnvironment};
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2019-08-03 19:56:29 -05:00
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use ra_syntax::{
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2019-09-16 05:48:54 -05:00
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ast::{self, AstNode},
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2020-03-05 04:06:02 -06:00
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SyntaxNode, SyntaxNodePtr, TextUnit,
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2019-08-03 19:56:29 -05:00
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};
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2018-12-05 04:16:20 -06:00
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use crate::{
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2020-03-05 04:08:31 -06:00
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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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2019-08-03 05:07:20 -05:00
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};
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2018-12-05 04:16:20 -06:00
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2019-04-11 07:58:00 -05:00
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/// `SourceAnalyzer` is a convenience wrapper which exposes HIR API in terms of
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2020-01-15 09:53:01 -06:00
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/// original source files. It should not be used inside the HIR itself.
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2019-04-10 03:15:55 -05:00
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#[derive(Debug)]
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2020-02-18 11:35:10 -06:00
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pub(crate) struct SourceAnalyzer {
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2019-11-15 15:40:54 -06:00
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file_id: HirFileId,
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2020-02-18 11:35:10 -06:00
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pub(crate) resolver: Resolver,
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2020-02-28 09:36:14 -06:00
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body: Option<Arc<Body>>,
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2019-04-13 02:49:01 -05:00
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body_source_map: Option<Arc<BodySourceMap>>,
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2019-12-08 05:44:14 -06:00
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infer: Option<Arc<InferenceResult>>,
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2019-11-27 08:46:02 -06:00
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scopes: Option<Arc<ExprScopes>>,
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2019-04-10 03:15:55 -05:00
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}
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2019-04-11 07:51:02 -05:00
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impl SourceAnalyzer {
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2020-01-14 08:27:05 -06:00
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pub(crate) fn new_for_body(
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db: &impl 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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2020-02-28 09:36:14 -06:00
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let (body, source_map) = db.body_with_source_map(def);
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2020-01-14 08:27:05 -06:00
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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, def, scope);
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SourceAnalyzer {
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resolver,
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2020-02-28 09:36:14 -06:00
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body: Some(body),
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2020-01-14 08:27:05 -06:00
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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,
|
2020-02-28 09:36:14 -06:00
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body: None,
|
2020-01-14 08:27:05 -06:00
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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,
|
2019-04-10 03:15:55 -05:00
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}
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}
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2019-11-14 01:30:30 -06:00
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fn expr_id(&self, expr: &ast::Expr) -> Option<ExprId> {
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2019-11-28 03:50:26 -06:00
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let src = InFile { file_id: self.file_id, value: expr };
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2019-11-14 01:30:30 -06:00
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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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2019-11-28 03:50:26 -06:00
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let src = InFile { file_id: self.file_id, value: pat };
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2019-11-14 01:30:30 -06:00
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self.body_source_map.as_ref()?.node_pat(src)
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}
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2019-12-23 07:47:11 -06:00
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fn expand_expr(
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&self,
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db: &impl HirDatabase,
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2020-03-04 07:39:51 -06:00
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expr: InFile<ast::MacroCall>,
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2019-12-23 07:47:11 -06:00
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) -> Option<InFile<ast::Expr>> {
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2020-03-04 07:39:51 -06:00
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let macro_file = self.body_source_map.as_ref()?.node_macro_file(expr.as_ref())?;
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2019-12-23 07:47:11 -06:00
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let expanded = db.parse_or_expand(macro_file)?;
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|
2020-03-04 07:39:51 -06:00
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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)
|
2019-12-23 07:47:11 -06:00
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}
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|
2020-01-24 07:32:47 -06:00
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fn trait_env(&self, db: &impl HirDatabase) -> Arc<TraitEnvironment> {
|
2020-01-24 08:22:00 -06:00
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TraitEnvironment::lower(db, &self.resolver)
|
2020-01-24 07:32:47 -06:00
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}
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|
2020-02-18 11:35:10 -06:00
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pub(crate) fn type_of(&self, db: &impl HirDatabase, expr: &ast::Expr) -> Option<Type> {
|
2020-03-04 07:39:51 -06:00
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let expr_id = match expr {
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ast::Expr::MacroCall(call) => {
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let expr = self.expand_expr(db, InFile::new(self.file_id, call.clone()))?;
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self.body_source_map.as_ref()?.node_expr(expr.as_ref())
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}
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_ => self.expr_id(expr),
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}?;
|
2019-12-22 23:18:28 -06:00
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|
2019-11-26 05:02:57 -06:00
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let ty = self.infer.as_ref()?[expr_id].clone();
|
2020-01-24 07:32:47 -06:00
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|
let environment = self.trait_env(db);
|
2019-11-26 05:02:57 -06:00
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Some(Type { krate: self.resolver.krate()?, ty: InEnvironment { value: ty, environment } })
|
2019-04-10 03:15:55 -05:00
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}
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|
2020-02-18 11:35:10 -06:00
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pub(crate) fn type_of_pat(&self, db: &impl HirDatabase, pat: &ast::Pat) -> Option<Type> {
|
2019-11-14 01:30:30 -06:00
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|
let pat_id = self.pat_id(pat)?;
|
2019-11-26 05:02:57 -06:00
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|
let ty = self.infer.as_ref()?[pat_id].clone();
|
2020-01-24 07:32:47 -06:00
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|
let environment = self.trait_env(db);
|
2019-11-26 05:02:57 -06:00
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Some(Type { krate: self.resolver.krate()?, ty: InEnvironment { value: ty, environment } })
|
2019-07-23 11:24:54 -05:00
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}
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|
2020-02-18 11:35:10 -06:00
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pub(crate) fn resolve_method_call(&self, call: &ast::MethodCallExpr) -> Option<Function> {
|
2019-11-14 01:30:30 -06:00
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let expr_id = self.expr_id(&call.clone().into())?;
|
2019-11-27 06:56:20 -06:00
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self.infer.as_ref()?.method_resolution(expr_id).map(Function::from)
|
2019-04-10 03:15:55 -05:00
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}
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|
2020-02-18 11:35:10 -06:00
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pub(crate) fn resolve_field(&self, field: &ast::FieldExpr) -> Option<crate::StructField> {
|
2019-11-14 01:30:30 -06:00
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let expr_id = self.expr_id(&field.clone().into())?;
|
2019-11-27 06:56:20 -06:00
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self.infer.as_ref()?.field_resolution(expr_id).map(|it| it.into())
|
2019-04-10 03:15:55 -05:00
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}
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|
2020-02-18 11:35:10 -06:00
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|
pub(crate) fn resolve_record_field(
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|
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|
&self,
|
2020-03-02 12:00:38 -06:00
|
|
|
db: &impl HirDatabase,
|
2020-02-18 11:35:10 -06:00
|
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|
field: &ast::RecordField,
|
2020-03-02 12:00:38 -06:00
|
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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(&it)?, None),
|
2019-12-20 07:47:01 -06:00
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|
None => {
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|
|
let src = InFile { file_id: self.file_id, value: field };
|
2020-03-02 12:00:38 -06:00
|
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|
let expr_id = self.body_source_map.as_ref()?.field_init_shorthand_expr(src)?;
|
|
|
|
|
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, &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)
|
2019-12-20 07:47:01 -06:00
|
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|
}
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|
};
|
2020-03-02 12:00:38 -06:00
|
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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))
|
2019-11-24 11:06:55 -06:00
|
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|
}
|
|
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|
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|
2020-02-18 11:35:10 -06:00
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|
|
pub(crate) fn resolve_record_literal(
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|
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|
|
&self,
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|
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|
|
record_lit: &ast::RecordLit,
|
|
|
|
|
) -> Option<crate::VariantDef> {
|
2019-11-14 01:30:30 -06:00
|
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|
let expr_id = self.expr_id(&record_lit.clone().into())?;
|
2019-11-27 07:25:01 -06:00
|
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|
self.infer.as_ref()?.variant_resolution_for_expr(expr_id).map(|it| it.into())
|
2019-07-21 06:11:45 -05:00
|
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|
}
|
|
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|
|
|
2020-02-18 11:35:10 -06:00
|
|
|
pub(crate) fn resolve_record_pattern(
|
|
|
|
|
&self,
|
|
|
|
|
record_pat: &ast::RecordPat,
|
|
|
|
|
) -> Option<crate::VariantDef> {
|
2019-11-14 01:30:30 -06:00
|
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|
let pat_id = self.pat_id(&record_pat.clone().into())?;
|
2019-11-27 07:25:01 -06:00
|
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|
self.infer.as_ref()?.variant_resolution_for_pat(pat_id).map(|it| it.into())
|
2019-07-12 11:56:18 -05:00
|
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|
}
|
|
|
|
|
|
2020-02-18 11:35:10 -06:00
|
|
|
pub(crate) fn resolve_macro_call(
|
2019-06-01 06:34:19 -05:00
|
|
|
&self,
|
|
|
|
|
db: &impl HirDatabase,
|
2019-11-28 03:50:26 -06:00
|
|
|
macro_call: InFile<&ast::MacroCall>,
|
2019-06-08 06:48:56 -05:00
|
|
|
) -> Option<MacroDef> {
|
2019-11-26 01:05:53 -06:00
|
|
|
let hygiene = Hygiene::new(db, macro_call.file_id);
|
|
|
|
|
let path = macro_call.value.path().and_then(|ast| Path::from_src(ast, &hygiene))?;
|
2019-12-13 05:12:36 -06:00
|
|
|
self.resolver.resolve_path_as_macro(db, path.mod_path()).map(|it| it.into())
|
2019-04-24 15:16:50 -05:00
|
|
|
}
|
|
|
|
|
|
2020-02-28 09:36:14 -06:00
|
|
|
pub(crate) fn resolve_bind_pat_to_const(
|
|
|
|
|
&self,
|
|
|
|
|
db: &impl HirDatabase,
|
|
|
|
|
pat: &ast::BindPat,
|
|
|
|
|
) -> Option<ModuleDef> {
|
|
|
|
|
let pat_id = self.pat_id(&pat.clone().into())?;
|
|
|
|
|
let body = self.body.as_ref()?;
|
|
|
|
|
let path = match &body[pat_id] {
|
|
|
|
|
Pat::Path(path) => path,
|
|
|
|
|
_ => return None,
|
|
|
|
|
};
|
|
|
|
|
let res = resolve_hir_path(db, &self.resolver, &path)?;
|
|
|
|
|
match res {
|
|
|
|
|
PathResolution::Def(def) => Some(def),
|
|
|
|
|
_ => None,
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2020-02-18 11:35:10 -06:00
|
|
|
pub(crate) fn resolve_path(
|
2019-04-13 03:00:15 -05:00
|
|
|
&self,
|
|
|
|
|
db: &impl HirDatabase,
|
2020-02-18 11:35:10 -06:00
|
|
|
path: &ast::Path,
|
2019-09-12 15:35:53 -05:00
|
|
|
) -> Option<PathResolution> {
|
2019-04-10 03:15:55 -05:00
|
|
|
if let Some(path_expr) = path.syntax().parent().and_then(ast::PathExpr::cast) {
|
2019-11-14 01:30:30 -06:00
|
|
|
let expr_id = self.expr_id(&path_expr.into())?;
|
2019-04-10 03:15:55 -05:00
|
|
|
if let Some(assoc) = self.infer.as_ref()?.assoc_resolutions_for_expr(expr_id) {
|
2019-11-27 07:02:33 -06:00
|
|
|
return Some(PathResolution::AssocItem(assoc.into()));
|
2019-04-10 03:15:55 -05:00
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
if let Some(path_pat) = path.syntax().parent().and_then(ast::PathPat::cast) {
|
2019-11-14 01:30:30 -06:00
|
|
|
let pat_id = self.pat_id(&path_pat.into())?;
|
2019-04-10 03:15:55 -05:00
|
|
|
if let Some(assoc) = self.infer.as_ref()?.assoc_resolutions_for_pat(pat_id) {
|
2019-11-27 07:02:33 -06:00
|
|
|
return Some(PathResolution::AssocItem(assoc.into()));
|
2019-04-10 03:15:55 -05:00
|
|
|
}
|
|
|
|
|
}
|
2019-09-26 12:59:38 -05:00
|
|
|
// This must be a normal source file rather than macro file.
|
2019-07-19 02:43:01 -05:00
|
|
|
let hir_path = crate::Path::from_ast(path.clone())?;
|
2020-02-18 11:35:10 -06:00
|
|
|
resolve_hir_path(db, &self.resolver, &hir_path)
|
2019-04-10 03:15:55 -05:00
|
|
|
}
|
2019-04-12 16:56:57 -05:00
|
|
|
|
2020-02-18 11:35:10 -06:00
|
|
|
pub(crate) fn expand(
|
2019-11-19 22:21:31 -06:00
|
|
|
&self,
|
|
|
|
|
db: &impl HirDatabase,
|
2019-11-28 03:50:26 -06:00
|
|
|
macro_call: InFile<&ast::MacroCall>,
|
2020-02-18 11:35:10 -06:00
|
|
|
) -> Option<HirFileId> {
|
2020-02-18 06:53:02 -06:00
|
|
|
let macro_call_id =
|
|
|
|
|
macro_call.as_call_id(db, |path| self.resolver.resolve_path_as_macro(db, &path))?;
|
2020-02-18 11:35:10 -06:00
|
|
|
Some(macro_call_id.as_file())
|
2019-11-16 07:49:26 -06:00
|
|
|
}
|
2019-04-13 02:49:01 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
fn scope_for(
|
|
|
|
|
scopes: &ExprScopes,
|
|
|
|
|
source_map: &BodySourceMap,
|
2019-11-28 03:50:26 -06:00
|
|
|
node: InFile<&SyntaxNode>,
|
2019-04-13 02:49:01 -05:00
|
|
|
) -> Option<ScopeId> {
|
2019-11-20 00:40:36 -06:00
|
|
|
node.value
|
2019-11-15 15:05:10 -06:00
|
|
|
.ancestors()
|
2019-09-02 13:23:19 -05:00
|
|
|
.filter_map(ast::Expr::cast)
|
2019-11-28 03:50:26 -06:00
|
|
|
.filter_map(|it| source_map.node_expr(InFile::new(node.file_id, &it)))
|
2019-04-13 02:49:01 -05:00
|
|
|
.find_map(|it| scopes.scope_for(it))
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
fn scope_for_offset(
|
|
|
|
|
scopes: &ExprScopes,
|
|
|
|
|
source_map: &BodySourceMap,
|
2019-11-28 03:50:26 -06:00
|
|
|
offset: InFile<TextUnit>,
|
2019-04-13 02:49:01 -05:00
|
|
|
) -> Option<ScopeId> {
|
|
|
|
|
scopes
|
2019-04-13 03:29:47 -05:00
|
|
|
.scope_by_expr()
|
2019-04-13 02:49:01 -05:00
|
|
|
.iter()
|
2019-09-02 13:23:19 -05:00
|
|
|
.filter_map(|(id, scope)| {
|
2020-03-06 07:44:44 -06:00
|
|
|
let source = source_map.expr_syntax(*id).ok()?;
|
2019-09-03 03:04:38 -05:00
|
|
|
// FIXME: correctly handle macro expansion
|
2019-11-15 15:05:10 -06:00
|
|
|
if source.file_id != offset.file_id {
|
2019-09-03 03:04:38 -05:00
|
|
|
return None;
|
|
|
|
|
}
|
|
|
|
|
let syntax_node_ptr =
|
2019-11-20 00:40:36 -06:00
|
|
|
source.value.either(|it| it.syntax_node_ptr(), |it| it.syntax_node_ptr());
|
2019-09-03 03:04:38 -05:00
|
|
|
Some((syntax_node_ptr, scope))
|
2019-09-02 13:23:19 -05:00
|
|
|
})
|
2019-04-13 02:49:01 -05:00
|
|
|
// find containing scope
|
|
|
|
|
.min_by_key(|(ptr, _scope)| {
|
2019-11-15 15:05:10 -06:00
|
|
|
(
|
2019-11-20 00:40:36 -06:00
|
|
|
!(ptr.range().start() <= offset.value && offset.value <= ptr.range().end()),
|
2019-11-15 15:05:10 -06:00
|
|
|
ptr.range().len(),
|
|
|
|
|
)
|
|
|
|
|
})
|
|
|
|
|
.map(|(ptr, scope)| {
|
2019-11-20 00:40:36 -06:00
|
|
|
adjust(scopes, source_map, ptr, offset.file_id, offset.value).unwrap_or(*scope)
|
2019-04-13 02:49:01 -05:00
|
|
|
})
|
|
|
|
|
}
|
|
|
|
|
|
2020-02-18 11:35:10 -06:00
|
|
|
pub(crate) fn resolve_hir_path(
|
|
|
|
|
db: &impl HirDatabase,
|
|
|
|
|
resolver: &Resolver,
|
|
|
|
|
path: &crate::Path,
|
|
|
|
|
) -> Option<PathResolution> {
|
|
|
|
|
let types = resolver.resolve_path_in_type_ns_fully(db, path.mod_path()).map(|ty| match ty {
|
|
|
|
|
TypeNs::SelfType(it) => PathResolution::SelfType(it.into()),
|
|
|
|
|
TypeNs::GenericParam(id) => PathResolution::TypeParam(TypeParam { id }),
|
|
|
|
|
TypeNs::AdtSelfType(it) | TypeNs::AdtId(it) => PathResolution::Def(Adt::from(it).into()),
|
|
|
|
|
TypeNs::EnumVariantId(it) => PathResolution::Def(EnumVariant::from(it).into()),
|
|
|
|
|
TypeNs::TypeAliasId(it) => PathResolution::Def(TypeAlias::from(it).into()),
|
|
|
|
|
TypeNs::BuiltinType(it) => PathResolution::Def(it.into()),
|
|
|
|
|
TypeNs::TraitId(it) => PathResolution::Def(Trait::from(it).into()),
|
|
|
|
|
});
|
|
|
|
|
let body_owner = resolver.body_owner();
|
|
|
|
|
let values = resolver.resolve_path_in_value_ns_fully(db, path.mod_path()).and_then(|val| {
|
|
|
|
|
let res = match val {
|
|
|
|
|
ValueNs::LocalBinding(pat_id) => {
|
|
|
|
|
let var = Local { parent: body_owner?.into(), pat_id };
|
|
|
|
|
PathResolution::Local(var)
|
|
|
|
|
}
|
|
|
|
|
ValueNs::FunctionId(it) => PathResolution::Def(Function::from(it).into()),
|
|
|
|
|
ValueNs::ConstId(it) => PathResolution::Def(Const::from(it).into()),
|
|
|
|
|
ValueNs::StaticId(it) => PathResolution::Def(Static::from(it).into()),
|
|
|
|
|
ValueNs::StructId(it) => PathResolution::Def(Struct::from(it).into()),
|
|
|
|
|
ValueNs::EnumVariantId(it) => PathResolution::Def(EnumVariant::from(it).into()),
|
|
|
|
|
};
|
|
|
|
|
Some(res)
|
|
|
|
|
});
|
|
|
|
|
|
|
|
|
|
let items = resolver
|
|
|
|
|
.resolve_module_path_in_items(db, path.mod_path())
|
|
|
|
|
.take_types()
|
|
|
|
|
.map(|it| PathResolution::Def(it.into()));
|
|
|
|
|
types.or(values).or(items).or_else(|| {
|
|
|
|
|
resolver
|
|
|
|
|
.resolve_path_as_macro(db, path.mod_path())
|
|
|
|
|
.map(|def| PathResolution::Macro(def.into()))
|
|
|
|
|
})
|
|
|
|
|
}
|
|
|
|
|
|
2019-04-13 02:49:01 -05:00
|
|
|
// 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,
|
2019-09-03 03:04:38 -05:00
|
|
|
file_id: HirFileId,
|
2019-04-13 02:49:01 -05:00
|
|
|
offset: TextUnit,
|
|
|
|
|
) -> Option<ScopeId> {
|
|
|
|
|
let r = ptr.range();
|
|
|
|
|
let child_scopes = scopes
|
2019-04-13 03:29:47 -05:00
|
|
|
.scope_by_expr()
|
2019-04-13 02:49:01 -05:00
|
|
|
.iter()
|
2019-09-02 13:23:19 -05:00
|
|
|
.filter_map(|(id, scope)| {
|
2020-03-06 07:44:44 -06:00
|
|
|
let source = source_map.expr_syntax(*id).ok()?;
|
2019-09-03 03:04:38 -05:00
|
|
|
// FIXME: correctly handle macro expansion
|
|
|
|
|
if source.file_id != file_id {
|
|
|
|
|
return None;
|
|
|
|
|
}
|
|
|
|
|
let syntax_node_ptr =
|
2019-11-20 00:40:36 -06:00
|
|
|
source.value.either(|it| it.syntax_node_ptr(), |it| it.syntax_node_ptr());
|
2019-09-03 03:04:38 -05:00
|
|
|
Some((syntax_node_ptr, scope))
|
2019-09-02 13:23:19 -05:00
|
|
|
})
|
2019-04-13 02:49:01 -05:00
|
|
|
.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)
|
2019-04-10 03:15:55 -05:00
|
|
|
}
|
