1212// See the License for the specific language governing permissions and
1313// limitations under the License.
1414
15- use crate :: GenerateCode ;
1615use derive_more:: From ;
16+ #[ cfg( all( feature = "std" , any( ink_abi = "sol" , ink_abi = "all" ) ) ) ]
17+ use ir:: IsDocAttribute ;
1718use proc_macro2:: TokenStream as TokenStream2 ;
19+ use quote:: quote;
1820use syn:: spanned:: Spanned ;
21+ #[ cfg( all( feature = "std" , any( ink_abi = "sol" , ink_abi = "all" ) ) ) ]
22+ use syn:: Fields ;
23+
24+ #[ cfg( all( feature = "std" , any( ink_abi = "sol" , ink_abi = "all" ) ) ) ]
25+ use crate :: generator:: sol;
26+ use crate :: GenerateCode ;
1927
2028/// Generates code for the event item.
2129#[ derive( From , Copy , Clone ) ]
@@ -38,6 +46,12 @@ impl GenerateCode for Event<'_> {
3846 . map ( |hex_s| quote:: quote! { #[ ink( signature_topic = #hex_s) ] } ) ;
3947 let cfg_attrs = self . item . get_cfg_attrs ( item. span ( ) ) ;
4048
49+ #[ cfg( all( feature = "std" , any( ink_abi = "sol" , ink_abi = "all" ) ) ) ]
50+ let sol_event_metadata = self . solidity_event_metadata ( ) ;
51+
52+ #[ cfg( not( all( feature = "std" , any( ink_abi = "sol" , ink_abi = "all" ) ) ) ) ]
53+ let sol_event_metadata = quote ! { } ;
54+
4155 quote:: quote! (
4256 #( #cfg_attrs ) *
4357 #[ cfg_attr( feature = "std" , derive( :: ink:: EventMetadata ) ) ]
@@ -46,6 +60,82 @@ impl GenerateCode for Event<'_> {
4660 #anonymous
4761 #signature_topic
4862 #item
63+
64+ #sol_event_metadata
4965 )
5066 }
5167}
68+
69+ impl Event < ' _ > {
70+ /// Generates Solidity ABI compatible metadata for ink! event.
71+ #[ cfg( all( feature = "std" , any( ink_abi = "sol" , ink_abi = "all" ) ) ) ]
72+ fn solidity_event_metadata ( & self ) -> TokenStream2 {
73+ let item = self . item . item ( ) ;
74+ let ident = & item. ident ;
75+ let name = ident. to_string ( ) ;
76+ let is_anonymous = self . item . anonymous ( ) ;
77+
78+ let fields = match & item. fields {
79+ Fields :: Named ( fields) => fields,
80+ Fields :: Unnamed ( _) | Fields :: Unit => unreachable ! ( "Expected named fields" ) ,
81+ } ;
82+ let params = fields. named . iter ( ) . map ( |field| {
83+ let ty = & field. ty ;
84+ let sol_ty = sol:: utils:: sol_type ( ty) ;
85+ let ident = field. ident . as_ref ( ) . expect ( "Expected a named field" ) ;
86+ let name = ident. to_string ( ) ;
87+ let is_topic = field. attrs . iter ( ) . any ( |attr| {
88+ let is_topic_arg = || {
89+ attr. parse_nested_meta ( |meta| {
90+ if meta. path . is_ident ( "topic" ) {
91+ Ok ( ( ) )
92+ } else {
93+ Err ( meta. error ( "Not a topic arg" ) )
94+ }
95+ } )
96+ . is_ok ( )
97+ } ;
98+ attr. path ( ) . is_ident ( "ink" ) && is_topic_arg ( )
99+ } ) ;
100+ let docs = field
101+ . attrs
102+ . iter ( )
103+ . filter_map ( |attr| attr. extract_docs ( ) )
104+ . collect :: < Vec < _ > > ( )
105+ . join ( "\n " ) ;
106+
107+ quote ! {
108+ :: ink:: metadata:: sol:: EventParamMetadata {
109+ name: #name,
110+ ty: #sol_ty,
111+ is_topic: #is_topic,
112+ docs: #docs,
113+ }
114+ }
115+ } ) ;
116+
117+ let docs = item
118+ . attrs
119+ . iter ( )
120+ . filter_map ( |attr| attr. extract_docs ( ) )
121+ . collect :: < Vec < _ > > ( )
122+ . join ( "\n " ) ;
123+
124+ quote ! {
125+ const _: ( ) = {
126+ // Register Solidity ABI compatible metadata function for event in distributed slice
127+ // for collecting all events referenced in the contract binary.
128+ #[ :: ink:: linkme:: distributed_slice( :: ink:: CONTRACT_EVENTS_SOL ) ]
129+ #[ linkme( crate = :: ink:: linkme) ]
130+ static EVENT_METADATA_SOL : fn ( ) -> :: ink:: metadata:: sol:: EventMetadata = || {
131+ :: ink:: metadata:: sol:: EventMetadata {
132+ name: #name,
133+ is_anonymous: #is_anonymous,
134+ params: vec![ #( #params ) , * ] ,
135+ docs: #docs,
136+ }
137+ } ;
138+ } ;
139+ }
140+ }
141+ }
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