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-rw-r--r--crates/ra_hir/src/function/scope.rs47
1 files changed, 46 insertions, 1 deletions
diff --git a/crates/ra_hir/src/function/scope.rs b/crates/ra_hir/src/function/scope.rs
index 863453291..9f1aa1ef2 100644
--- a/crates/ra_hir/src/function/scope.rs
+++ b/crates/ra_hir/src/function/scope.rs
@@ -1,7 +1,7 @@
1use rustc_hash::{FxHashMap, FxHashSet}; 1use rustc_hash::{FxHashMap, FxHashSet};
2 2
3use ra_syntax::{ 3use ra_syntax::{
4 AstNode, SmolStr, SyntaxNodeRef, TextRange, 4 AstNode, SmolStr, SyntaxNodeRef, TextUnit, TextRange,
5 algo::generate, 5 algo::generate,
6 ast::{self, ArgListOwner, LoopBodyOwner, NameOwner}, 6 ast::{self, ArgListOwner, LoopBodyOwner, NameOwner},
7}; 7};
@@ -57,6 +57,48 @@ impl FnScopes {
57 self.scopes[scope].parent 57 self.scopes[scope].parent
58 }) 58 })
59 } 59 }
60 pub fn scope_chain_for_offset<'a>(
61 &'a self,
62 offset: TextUnit,
63 ) -> impl Iterator<Item = ScopeId> + 'a {
64 let scope = self
65 .scope_for
66 .iter()
67 // find containin scope
68 .min_by_key(|(ptr, _scope)| {
69 (
70 !(ptr.range().start() <= offset && offset <= ptr.range().end()),
71 ptr.range().len(),
72 )
73 })
74 .map(|(ptr, scope)| self.adjust(*ptr, *scope, offset));
75
76 generate(scope, move |&scope| self.scopes[scope].parent)
77 }
78 // XXX: during completion, cursor might be outside of any particular
79 // expression. Try to figure out the correct scope...
80 fn adjust(&self, ptr: LocalSyntaxPtr, original_scope: ScopeId, offset: TextUnit) -> ScopeId {
81 let r = ptr.range();
82 let child_scopes = self
83 .scope_for
84 .iter()
85 .map(|(ptr, scope)| (ptr.range(), scope))
86 .filter(|(range, _)| range.start() <= offset && range.is_subrange(&r) && *range != r);
87
88 child_scopes
89 .max_by(|(r1, _), (r2, _)| {
90 if r2.is_subrange(&r1) {
91 std::cmp::Ordering::Greater
92 } else if r1.is_subrange(&r2) {
93 std::cmp::Ordering::Less
94 } else {
95 r1.start().cmp(&r2.start())
96 }
97 })
98 .map(|(ptr, scope)| *scope)
99 .unwrap_or(original_scope)
100 }
101
60 pub fn resolve_local_name<'a>(&'a self, name_ref: ast::NameRef) -> Option<&'a ScopeEntry> { 102 pub fn resolve_local_name<'a>(&'a self, name_ref: ast::NameRef) -> Option<&'a ScopeEntry> {
61 let mut shadowed = FxHashSet::default(); 103 let mut shadowed = FxHashSet::default();
62 let ret = self 104 let ret = self
@@ -144,6 +186,8 @@ impl ScopeEntry {
144} 186}
145 187
146fn compute_block_scopes(block: ast::Block, scopes: &mut FnScopes, mut scope: ScopeId) { 188fn compute_block_scopes(block: ast::Block, scopes: &mut FnScopes, mut scope: ScopeId) {
189 // A hack for completion :(
190 scopes.set_scope(block.syntax(), scope);
147 for stmt in block.statements() { 191 for stmt in block.statements() {
148 match stmt { 192 match stmt {
149 ast::Stmt::LetStmt(stmt) => { 193 ast::Stmt::LetStmt(stmt) => {
@@ -165,6 +209,7 @@ fn compute_block_scopes(block: ast::Block, scopes: &mut FnScopes, mut scope: Sco
165 } 209 }
166 } 210 }
167 if let Some(expr) = block.expr() { 211 if let Some(expr) = block.expr() {
212 eprintln!("{:?}", expr);
168 scopes.set_scope(expr.syntax(), scope); 213 scopes.set_scope(expr.syntax(), scope);
169 compute_expr_scopes(expr, scopes, scope); 214 compute_expr_scopes(expr, scopes, scope);
170 } 215 }