@@ -47,7 +47,9 @@ use self::lsp::ext as lsp_ext;
4747#[ cfg( test) ]
4848mod integrated_benchmarks;
4949
50+ use ide:: { CompletionItem , CompletionRelevance } ;
5051use serde:: de:: DeserializeOwned ;
52+ use tenthash:: TentHasher ;
5153
5254pub use crate :: {
5355 lsp:: capabilities:: server_capabilities, main_loop:: main_loop, reload:: ws_to_crate_graph,
@@ -61,3 +63,79 @@ pub fn from_json<T: DeserializeOwned>(
6163 serde_json:: from_value ( json. clone ( ) )
6264 . map_err ( |e| anyhow:: format_err!( "Failed to deserialize {what}: {e}; {json}" ) )
6365}
66+
67+ fn completion_item_hash ( item : & CompletionItem , is_ref_completion : bool ) -> [ u8 ; 20 ] {
68+ fn hash_completion_relevance ( hasher : & mut TentHasher , relevance : & CompletionRelevance ) {
69+ use ide_completion:: {
70+ CompletionRelevancePostfixMatch , CompletionRelevanceReturnType ,
71+ CompletionRelevanceTypeMatch ,
72+ } ;
73+
74+ hasher. update ( [
75+ u8:: from ( relevance. exact_name_match ) ,
76+ u8:: from ( relevance. is_local ) ,
77+ u8:: from ( relevance. is_name_already_imported ) ,
78+ u8:: from ( relevance. requires_import ) ,
79+ u8:: from ( relevance. is_private_editable ) ,
80+ ] ) ;
81+ if let Some ( type_match) = & relevance. type_match {
82+ let label = match type_match {
83+ CompletionRelevanceTypeMatch :: CouldUnify => "could_unify" ,
84+ CompletionRelevanceTypeMatch :: Exact => "exact" ,
85+ } ;
86+ hasher. update ( label) ;
87+ }
88+ if let Some ( trait_) = & relevance. trait_ {
89+ hasher. update ( [ u8:: from ( trait_. is_op_method ) , u8:: from ( trait_. notable_trait ) ] ) ;
90+ }
91+ if let Some ( postfix_match) = & relevance. postfix_match {
92+ let label = match postfix_match {
93+ CompletionRelevancePostfixMatch :: NonExact => "non_exact" ,
94+ CompletionRelevancePostfixMatch :: Exact => "exact" ,
95+ } ;
96+ hasher. update ( label) ;
97+ }
98+ if let Some ( function) = & relevance. function {
99+ hasher. update ( [ u8:: from ( function. has_params ) , u8:: from ( function. has_self_param ) ] ) ;
100+ let label = match function. return_type {
101+ CompletionRelevanceReturnType :: Other => "other" ,
102+ CompletionRelevanceReturnType :: DirectConstructor => "direct_constructor" ,
103+ CompletionRelevanceReturnType :: Constructor => "constructor" ,
104+ CompletionRelevanceReturnType :: Builder => "builder" ,
105+ } ;
106+ hasher. update ( label) ;
107+ }
108+ }
109+
110+ let mut hasher = TentHasher :: new ( ) ;
111+ hasher. update ( [
112+ u8:: from ( is_ref_completion) ,
113+ u8:: from ( item. is_snippet ) ,
114+ u8:: from ( item. deprecated ) ,
115+ u8:: from ( item. trigger_call_info ) ,
116+ ] ) ;
117+ hasher. update ( & item. label ) ;
118+ if let Some ( label_detail) = & item. label_detail {
119+ hasher. update ( label_detail) ;
120+ }
121+ // NB: do not hash edits or source range, as those may change between the time the client sends the resolve request
122+ // and the time it receives it: some editors do allow changing the buffer between that, leading to ranges being different.
123+ //
124+ // Documentation hashing is skipped too, as it's a large blob to process,
125+ // while not really making completion properties more unique as they are already.
126+ hasher. update ( item. kind . tag ( ) ) ;
127+ hasher. update ( & item. lookup ) ;
128+ if let Some ( detail) = & item. detail {
129+ hasher. update ( detail) ;
130+ }
131+ hash_completion_relevance ( & mut hasher, & item. relevance ) ;
132+ if let Some ( ( mutability, text_size) ) = & item. ref_match {
133+ hasher. update ( mutability. as_keyword_for_ref ( ) ) ;
134+ hasher. update ( u32:: from ( * text_size) . to_le_bytes ( ) ) ;
135+ }
136+ for ( import_path, import_name) in & item. import_to_add {
137+ hasher. update ( import_path) ;
138+ hasher. update ( import_name) ;
139+ }
140+ hasher. finalize ( )
141+ }
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