From ac92973a6c5934377c6eca9906f3b7f17e220d4e Mon Sep 17 00:00:00 2001 From: Aleksey Kladov Date: Tue, 8 Jan 2019 20:11:13 +0300 Subject: move function to code_model_api --- crates/ra_hir/src/function/scope.rs | 481 ------------------------------------ 1 file changed, 481 deletions(-) delete mode 100644 crates/ra_hir/src/function/scope.rs (limited to 'crates/ra_hir/src/function/scope.rs') diff --git a/crates/ra_hir/src/function/scope.rs b/crates/ra_hir/src/function/scope.rs deleted file mode 100644 index 699784f71..000000000 --- a/crates/ra_hir/src/function/scope.rs +++ /dev/null @@ -1,481 +0,0 @@ -use std::sync::Arc; - -use rustc_hash::{FxHashMap, FxHashSet}; - -use ra_syntax::{ - AstNode, SyntaxNode, TextUnit, TextRange, - algo::generate, - ast, -}; -use ra_arena::{Arena, RawId, impl_arena_id}; -use ra_db::LocalSyntaxPtr; - -use crate::{Name, AsName, expr::{PatId, ExprId, Pat, Expr, Body, Statement, BodySyntaxMapping}}; - -#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)] -pub struct ScopeId(RawId); -impl_arena_id!(ScopeId); - -#[derive(Debug, PartialEq, Eq)] -pub struct FnScopes { - body: Arc, - scopes: Arena, - scope_for: FxHashMap, -} - -#[derive(Debug, PartialEq, Eq)] -pub struct ScopeEntry { - name: Name, - pat: PatId, -} - -#[derive(Debug, PartialEq, Eq)] -pub struct ScopeData { - parent: Option, - entries: Vec, -} - -impl FnScopes { - pub(crate) fn new(body: Arc) -> FnScopes { - let mut scopes = FnScopes { - body: body.clone(), - scopes: Arena::default(), - scope_for: FxHashMap::default(), - }; - let root = scopes.root_scope(); - scopes.add_params_bindings(root, body.args()); - compute_expr_scopes(body.body_expr(), &body, &mut scopes, root); - scopes - } - pub fn entries(&self, scope: ScopeId) -> &[ScopeEntry] { - &self.scopes[scope].entries - } - pub fn scope_chain_for<'a>(&'a self, expr: ExprId) -> impl Iterator + 'a { - generate(self.scope_for(expr), move |&scope| { - self.scopes[scope].parent - }) - } - - pub fn resolve_local_name<'a>( - &'a self, - context_expr: ExprId, - name: Name, - ) -> Option<&'a ScopeEntry> { - let mut shadowed = FxHashSet::default(); - let ret = self - .scope_chain_for(context_expr) - .flat_map(|scope| self.entries(scope).iter()) - .filter(|entry| shadowed.insert(entry.name())) - .find(|entry| entry.name() == &name); - ret - } - - fn root_scope(&mut self) -> ScopeId { - self.scopes.alloc(ScopeData { - parent: None, - entries: vec![], - }) - } - fn new_scope(&mut self, parent: ScopeId) -> ScopeId { - self.scopes.alloc(ScopeData { - parent: Some(parent), - entries: vec![], - }) - } - fn add_bindings(&mut self, body: &Body, scope: ScopeId, pat: PatId) { - match &body[pat] { - Pat::Bind { name } => self.scopes[scope].entries.push(ScopeEntry { - name: name.clone(), - pat, - }), - p => p.walk_child_pats(|pat| self.add_bindings(body, scope, pat)), - } - } - fn add_params_bindings(&mut self, scope: ScopeId, params: &[PatId]) { - let body = Arc::clone(&self.body); - params - .into_iter() - .for_each(|pat| self.add_bindings(&body, scope, *pat)); - } - fn set_scope(&mut self, node: ExprId, scope: ScopeId) { - self.scope_for.insert(node, scope); - } - fn scope_for(&self, expr: ExprId) -> Option { - self.scope_for.get(&expr).map(|&scope| scope) - } -} - -#[derive(Debug, Clone, PartialEq, Eq)] -pub struct ScopesWithSyntaxMapping { - pub syntax_mapping: Arc, - pub scopes: Arc, -} - -#[derive(Debug, Clone, PartialEq, Eq)] -pub struct ScopeEntryWithSyntax { - name: Name, - ptr: LocalSyntaxPtr, -} - -impl ScopeEntryWithSyntax { - pub fn name(&self) -> &Name { - &self.name - } - pub fn ptr(&self) -> LocalSyntaxPtr { - self.ptr - } -} - -impl ScopesWithSyntaxMapping { - pub fn scope_chain<'a>(&'a self, node: &SyntaxNode) -> impl Iterator + 'a { - generate(self.scope_for(node), move |&scope| { - self.scopes.scopes[scope].parent - }) - } - pub fn scope_chain_for_offset<'a>( - &'a self, - offset: TextUnit, - ) -> impl Iterator + 'a { - let scope = self - .scopes - .scope_for - .iter() - .filter_map(|(id, scope)| Some((self.syntax_mapping.expr_syntax(*id)?, scope))) - // find containing scope - .min_by_key(|(ptr, _scope)| { - ( - !(ptr.range().start() <= offset && offset <= ptr.range().end()), - ptr.range().len(), - ) - }) - .map(|(ptr, scope)| self.adjust(ptr, *scope, offset)); - - generate(scope, move |&scope| self.scopes.scopes[scope].parent) - } - // XXX: during completion, cursor might be outside of any particular - // expression. Try to figure out the correct scope... - fn adjust(&self, ptr: LocalSyntaxPtr, original_scope: ScopeId, offset: TextUnit) -> ScopeId { - let r = ptr.range(); - let child_scopes = self - .scopes - .scope_for - .iter() - .filter_map(|(id, scope)| Some((self.syntax_mapping.expr_syntax(*id)?, 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) - .unwrap_or(original_scope) - } - - pub fn resolve_local_name(&self, name_ref: &ast::NameRef) -> Option { - let mut shadowed = FxHashSet::default(); - let name = name_ref.as_name(); - let ret = self - .scope_chain(name_ref.syntax()) - .flat_map(|scope| self.scopes.entries(scope).iter()) - .filter(|entry| shadowed.insert(entry.name())) - .filter(|entry| entry.name() == &name) - .nth(0); - ret.and_then(|entry| { - Some(ScopeEntryWithSyntax { - name: entry.name().clone(), - ptr: self.syntax_mapping.pat_syntax(entry.pat())?, - }) - }) - } - - pub fn find_all_refs(&self, pat: &ast::BindPat) -> Vec { - let fn_def = pat.syntax().ancestors().find_map(ast::FnDef::cast).unwrap(); - let name_ptr = LocalSyntaxPtr::new(pat.syntax()); - fn_def - .syntax() - .descendants() - .filter_map(ast::NameRef::cast) - .filter(|name_ref| match self.resolve_local_name(*name_ref) { - None => false, - Some(entry) => entry.ptr() == name_ptr, - }) - .map(|name_ref| ReferenceDescriptor { - name: name_ref.syntax().text().to_string(), - range: name_ref.syntax().range(), - }) - .collect() - } - - fn scope_for(&self, node: &SyntaxNode) -> Option { - node.ancestors() - .map(LocalSyntaxPtr::new) - .filter_map(|ptr| self.syntax_mapping.syntax_expr(ptr)) - .find_map(|it| self.scopes.scope_for(it)) - } -} - -impl ScopeEntry { - pub fn name(&self) -> &Name { - &self.name - } - pub fn pat(&self) -> PatId { - self.pat - } -} - -fn compute_block_scopes( - statements: &[Statement], - tail: Option, - body: &Body, - scopes: &mut FnScopes, - mut scope: ScopeId, -) { - for stmt in statements { - match stmt { - Statement::Let { - pat, initializer, .. - } => { - if let Some(expr) = initializer { - scopes.set_scope(*expr, scope); - compute_expr_scopes(*expr, body, scopes, scope); - } - scope = scopes.new_scope(scope); - scopes.add_bindings(body, scope, *pat); - } - Statement::Expr(expr) => { - scopes.set_scope(*expr, scope); - compute_expr_scopes(*expr, body, scopes, scope); - } - } - } - if let Some(expr) = tail { - compute_expr_scopes(expr, body, scopes, scope); - } -} - -fn compute_expr_scopes(expr: ExprId, body: &Body, scopes: &mut FnScopes, scope: ScopeId) { - scopes.set_scope(expr, scope); - match &body[expr] { - Expr::Block { statements, tail } => { - compute_block_scopes(&statements, *tail, body, scopes, scope); - } - Expr::For { - iterable, - pat, - body: body_expr, - } => { - compute_expr_scopes(*iterable, body, scopes, scope); - let scope = scopes.new_scope(scope); - scopes.add_bindings(body, scope, *pat); - compute_expr_scopes(*body_expr, body, scopes, scope); - } - Expr::Lambda { - args, - body: body_expr, - .. - } => { - let scope = scopes.new_scope(scope); - scopes.add_params_bindings(scope, &args); - compute_expr_scopes(*body_expr, body, scopes, scope); - } - Expr::Match { expr, arms } => { - compute_expr_scopes(*expr, body, scopes, scope); - for arm in arms { - let scope = scopes.new_scope(scope); - for pat in &arm.pats { - scopes.add_bindings(body, scope, *pat); - } - scopes.set_scope(arm.expr, scope); - compute_expr_scopes(arm.expr, body, scopes, scope); - } - } - e => e.walk_child_exprs(|e| compute_expr_scopes(e, body, scopes, scope)), - }; -} - -#[derive(Debug)] -pub struct ReferenceDescriptor { - pub range: TextRange, - pub name: String, -} - -#[cfg(test)] -mod tests { - use ra_editor::find_node_at_offset; - use ra_syntax::SourceFile; - use test_utils::{extract_offset, assert_eq_text}; - - use crate::expr; - - use super::*; - - fn do_check(code: &str, expected: &[&str]) { - let (off, code) = extract_offset(code); - let code = { - let mut buf = String::new(); - let off = u32::from(off) as usize; - buf.push_str(&code[..off]); - buf.push_str("marker"); - buf.push_str(&code[off..]); - buf - }; - let file = SourceFile::parse(&code); - let marker: &ast::PathExpr = find_node_at_offset(file.syntax(), off).unwrap(); - let fn_def: &ast::FnDef = find_node_at_offset(file.syntax(), off).unwrap(); - let body_hir = expr::collect_fn_body_syntax(fn_def); - let scopes = FnScopes::new(Arc::clone(body_hir.body())); - let scopes = ScopesWithSyntaxMapping { - scopes: Arc::new(scopes), - syntax_mapping: Arc::new(body_hir), - }; - let actual = scopes - .scope_chain(marker.syntax()) - .flat_map(|scope| scopes.scopes.entries(scope)) - .map(|it| it.name().to_string()) - .collect::>() - .join("\n"); - let expected = expected.join("\n"); - assert_eq_text!(&expected, &actual); - } - - #[test] - fn test_lambda_scope() { - do_check( - r" - fn quux(foo: i32) { - let f = |bar, baz: i32| { - <|> - }; - }", - &["bar", "baz", "foo"], - ); - } - - #[test] - fn test_call_scope() { - do_check( - r" - fn quux() { - f(|x| <|> ); - }", - &["x"], - ); - } - - #[test] - fn test_method_call_scope() { - do_check( - r" - fn quux() { - z.f(|x| <|> ); - }", - &["x"], - ); - } - - #[test] - fn test_loop_scope() { - do_check( - r" - fn quux() { - loop { - let x = (); - <|> - }; - }", - &["x"], - ); - } - - #[test] - fn test_match() { - do_check( - r" - fn quux() { - match () { - Some(x) => { - <|> - } - }; - }", - &["x"], - ); - } - - #[test] - fn test_shadow_variable() { - do_check( - r" - fn foo(x: String) { - let x : &str = &x<|>; - }", - &["x"], - ); - } - - fn do_check_local_name(code: &str, expected_offset: u32) { - let (off, code) = extract_offset(code); - let file = SourceFile::parse(&code); - let fn_def: &ast::FnDef = find_node_at_offset(file.syntax(), off).unwrap(); - let name_ref: &ast::NameRef = find_node_at_offset(file.syntax(), off).unwrap(); - - let body_hir = expr::collect_fn_body_syntax(fn_def); - let scopes = FnScopes::new(Arc::clone(body_hir.body())); - let scopes = ScopesWithSyntaxMapping { - scopes: Arc::new(scopes), - syntax_mapping: Arc::new(body_hir), - }; - - let local_name_entry = scopes.resolve_local_name(name_ref).unwrap(); - let local_name = local_name_entry.ptr(); - let expected_name = - find_node_at_offset::(file.syntax(), expected_offset.into()).unwrap(); - assert_eq!(local_name.range(), expected_name.syntax().range()); - } - - #[test] - fn test_resolve_local_name() { - do_check_local_name( - r#" - fn foo(x: i32, y: u32) { - { - let z = x * 2; - } - { - let t = x<|> * 3; - } - }"#, - 21, - ); - } - - #[test] - fn test_resolve_local_name_declaration() { - do_check_local_name( - r#" - fn foo(x: String) { - let x : &str = &x<|>; - }"#, - 21, - ); - } - - #[test] - fn test_resolve_local_name_shadow() { - do_check_local_name( - r" - fn foo(x: String) { - let x : &str = &x; - x<|> - }", - 46, - ); - } -} -- cgit v1.2.3