@@ -47,7 +47,9 @@ use self::lsp::ext as lsp_ext;
4747#[ cfg( test) ]
4848mod integrated_benchmarks;
4949
50+ use ide:: { CompletionItem , CompletionRelevance , TextEdit , TextRange } ;
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 +63,90 @@ 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_text_range ( hasher : & mut TentHasher , text_range : & TextRange ) {
69+ hasher. update ( u32:: from ( text_range. start ( ) ) . to_le_bytes ( ) ) ;
70+ hasher. update ( u32:: from ( text_range. end ( ) ) . to_le_bytes ( ) ) ;
71+ }
72+
73+ fn hash_text_edit ( hasher : & mut TentHasher , edit : & TextEdit ) {
74+ for indel in edit. iter ( ) {
75+ hasher. update ( & indel. insert ) ;
76+ hash_text_range ( hasher, & indel. delete ) ;
77+ }
78+ }
79+
80+ fn has_completion_relevance ( hasher : & mut TentHasher , relevance : & CompletionRelevance ) {
81+ use ide_completion:: {
82+ CompletionRelevancePostfixMatch , CompletionRelevanceReturnType ,
83+ CompletionRelevanceTypeMatch ,
84+ } ;
85+
86+ if let Some ( type_match) = & relevance. type_match {
87+ let label = match type_match {
88+ CompletionRelevanceTypeMatch :: CouldUnify => "could_unify" ,
89+ CompletionRelevanceTypeMatch :: Exact => "exact" ,
90+ } ;
91+ hasher. update ( label) ;
92+ }
93+ hasher. update ( & [ u8:: from ( relevance. exact_name_match ) , u8:: from ( relevance. is_local ) ] ) ;
94+ if let Some ( trait_) = & relevance. trait_ {
95+ hasher. update ( & [ u8:: from ( trait_. is_op_method ) , u8:: from ( trait_. notable_trait ) ] ) ;
96+ }
97+ hasher. update ( & [
98+ u8:: from ( relevance. is_name_already_imported ) ,
99+ u8:: from ( relevance. requires_import ) ,
100+ u8:: from ( relevance. is_private_editable ) ,
101+ ] ) ;
102+ if let Some ( postfix_match) = & relevance. postfix_match {
103+ let label = match postfix_match {
104+ CompletionRelevancePostfixMatch :: NonExact => "non_exact" ,
105+ CompletionRelevancePostfixMatch :: Exact => "exact" ,
106+ } ;
107+ hasher. update ( label) ;
108+ }
109+ if let Some ( function) = & relevance. function {
110+ hasher. update ( & [ u8:: from ( function. has_params ) , u8:: from ( function. has_self_param ) ] ) ;
111+ let label = match function. return_type {
112+ CompletionRelevanceReturnType :: Other => "other" ,
113+ CompletionRelevanceReturnType :: DirectConstructor => "direct_constructor" ,
114+ CompletionRelevanceReturnType :: Constructor => "constructor" ,
115+ CompletionRelevanceReturnType :: Builder => "builder" ,
116+ } ;
117+ hasher. update ( label) ;
118+ }
119+ }
120+
121+ let mut hasher = TentHasher :: new ( ) ;
122+ hasher. update ( & [
123+ u8:: from ( is_ref_completion) ,
124+ u8:: from ( item. is_snippet ) ,
125+ u8:: from ( item. deprecated ) ,
126+ u8:: from ( item. trigger_call_info ) ,
127+ ] ) ;
128+ hasher. update ( & item. label ) ;
129+ if let Some ( label_detail) = & item. label_detail {
130+ hasher. update ( label_detail) ;
131+ }
132+ hash_text_range ( & mut hasher, & item. source_range ) ;
133+ hash_text_edit ( & mut hasher, & item. text_edit ) ;
134+ hasher. update ( item. kind . tag ( ) ) ;
135+ hasher. update ( & item. lookup ) ;
136+ if let Some ( detail) = & item. detail {
137+ hasher. update ( detail) ;
138+ }
139+ if let Some ( documentation) = & item. documentation {
140+ hasher. update ( documentation. as_str ( ) ) ;
141+ }
142+ has_completion_relevance ( & mut hasher, & item. relevance ) ;
143+ if let Some ( ( mutability, text_size) ) = & item. ref_match {
144+ hasher. update ( mutability. as_keyword_for_ref ( ) ) ;
145+ hasher. update ( u32:: from ( * text_size) . to_le_bytes ( ) ) ;
146+ }
147+ for ( import_path, import_name) in & item. import_to_add {
148+ hasher. update ( import_path) ;
149+ hasher. update ( import_name) ;
150+ }
151+ hasher. finalize ( )
152+ }
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