git.delta.rocks / unique-network / refs/commits / 527498be3f5d

1// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.2// This file is part of Unique Network.34// Unique Network is free software: you can redistribute it and/or modify5// it under the terms of the GNU General Public License as published by6// the Free Software Foundation, either version 3 of the License, or7// (at your option) any later version.89// Unique Network is distributed in the hope that it will be useful,10// but WITHOUT ANY WARRANTY; without even the implied warranty of11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the12// GNU General Public License for more details.1314// You should have received a copy of the GNU General Public License15// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.1617#![allow(dead_code)]1819// NOTE: In order to understand this Rust macro better, first read this chapter20// about Procedural Macros in Rust book:21// https://doc.rust-lang.org/reference/procedural-macros.html2223use proc_macro2::TokenStream;24use quote::{quote, ToTokens, format_ident};25use inflector::cases;26use std::fmt::Write;27use syn::{28	Expr, FnArg, GenericArgument, Generics, Ident, ImplItem, ImplItemMethod, ItemImpl, Lit, Meta,29	MetaNameValue, PatType, PathArguments, ReturnType, Type,30	spanned::Spanned,31	parse::{Parse, ParseStream},32	parenthesized, Token, LitInt, LitStr,33};3435use crate::{36	fn_selector_str, parse_ident_from_pat, parse_ident_from_path, parse_path, parse_path_segment,37	parse_result_ok, pascal_ident_to_call, pascal_ident_to_snake_call, snake_ident_to_pascal,38	snake_ident_to_screaming,39};4041struct Is {42	name: Ident,43	pascal_call_name: Ident,44	snake_call_name: Ident,45	via: Option<(Type, Ident)>,46	condition: Option<Expr>,47}48impl Is {49	fn expand_call_def(&self, gen_ref: &proc_macro2::TokenStream) -> proc_macro2::TokenStream {50		let name = &self.name;51		let pascal_call_name = &self.pascal_call_name;52		quote! {53			#name(#pascal_call_name #gen_ref)54		}55	}5657	fn expand_interface_id(&self) -> proc_macro2::TokenStream {58		let pascal_call_name = &self.pascal_call_name;59		quote! {60			interface_id ^= u32::from_be_bytes(#pascal_call_name::interface_id());61		}62	}6364	fn expand_supports_interface(65		&self,66		generics: &proc_macro2::TokenStream,67	) -> proc_macro2::TokenStream {68		let pascal_call_name = &self.pascal_call_name;69		let condition = self.condition.as_ref().map(|condition| {70			quote! {71				(#condition) &&72			}73		});74		quote! {75			#condition <#pascal_call_name #generics>::supports_interface(this, interface_id)76		}77	}7879	fn expand_variant_weight(&self) -> proc_macro2::TokenStream {80		let name = &self.name;81		quote! {82			Self::#name(call) => call.weight()83		}84	}8586	fn expand_variant_call(87		&self,88		call_name: &proc_macro2::Ident,89		generics: &proc_macro2::TokenStream,90	) -> proc_macro2::TokenStream {91		let name = &self.name;92		let pascal_call_name = &self.pascal_call_name;93		let via_typ = self94			.via95			.as_ref()96			.map(|(t, _)| quote! {#t})97			.unwrap_or_else(|| quote! {Self});98		let via_map = self99			.via100			.as_ref()101			.map(|(_, i)| quote! {.#i()})102			.unwrap_or_default();103		let condition = self.condition.as_ref().map(|condition| {104			quote! {105				if ({let this = &self; (#condition)})106			}107		});108		quote! {109			#call_name::#name(call) #condition => return <#via_typ as ::evm_coder::Callable<#pascal_call_name #generics>>::call(self #via_map, Msg {110				call,111				caller: c.caller,112				value: c.value,113			})114		}115	}116117	fn expand_parse(&self, generics: &proc_macro2::TokenStream) -> proc_macro2::TokenStream {118		let name = &self.name;119		let pascal_call_name = &self.pascal_call_name;120		quote! {121			if let Some(parsed_call) = <#pascal_call_name #generics>::parse(method_id, reader)? {122				return Ok(Some(Self::#name(parsed_call)))123			}124		}125	}126127	fn expand_generator(&self, generics: &proc_macro2::TokenStream) -> proc_macro2::TokenStream {128		let pascal_call_name = &self.pascal_call_name;129		quote! {130			<#pascal_call_name #generics>::generate_solidity_interface(tc, is_impl);131		}132	}133134	fn expand_event_generator(&self) -> proc_macro2::TokenStream {135		let name = &self.name;136		quote! {137			#name::generate_solidity_interface(tc, is_impl);138		}139	}140}141142#[derive(Default)]143struct IsList(Vec<Is>);144impl Parse for IsList {145	fn parse(input: ParseStream) -> syn::Result<Self> {146		let mut out = vec![];147		loop {148			if input.is_empty() {149				break;150			}151			let name = input.parse::<Ident>()?;152			let lookahead = input.lookahead1();153154			let mut condition: Option<Expr> = None;155			let mut via: Option<(Type, Ident)> = None;156157			if lookahead.peek(syn::token::Paren) {158				let contents;159				parenthesized!(contents in input);160				let input = contents;161162				while !input.is_empty() {163					let lookahead = input.lookahead1();164					if lookahead.peek(Token![if]) {165						input.parse::<Token![if]>()?;166						let contents;167						parenthesized!(contents in input);168						let contents = contents.parse::<Expr>()?;169170						if condition.replace(contents).is_some() {171							return Err(syn::Error::new(input.span(), "condition is already set"));172						}173					} else if lookahead.peek(kw::via) {174						input.parse::<kw::via>()?;175						let contents;176						parenthesized!(contents in input);177178						let method = contents.parse::<Ident>()?;179						contents.parse::<kw::returns>()?;180						let ty = contents.parse::<Type>()?;181182						if via.replace((ty, method)).is_some() {183							return Err(syn::Error::new(input.span(), "via is already set"));184						}185					} else {186						return Err(lookahead.error());187					}188189					if input.peek(Token![,]) {190						input.parse::<Token![,]>()?;191					} else if !input.is_empty() {192						return Err(syn::Error::new(input.span(), "expected end"));193					}194				}195			} else if lookahead.peek(Token![,]) || input.is_empty() {196				// Pass197			} else {198				return Err(lookahead.error());199			};200			out.push(Is {201				pascal_call_name: pascal_ident_to_call(&name),202				snake_call_name: pascal_ident_to_snake_call(&name),203				name,204				via,205				condition,206			});207			if input.peek(Token![,]) {208				input.parse::<Token![,]>()?;209				continue;210			} else {211				break;212			}213		}214		Ok(Self(out))215	}216}217218pub struct InterfaceInfo {219	name: Ident,220	is: IsList,221	inline_is: IsList,222	events: IsList,223	expect_selector: Option<u32>,224}225impl Parse for InterfaceInfo {226	fn parse(input: ParseStream) -> syn::Result<Self> {227		let mut name = None;228		let mut is = None;229		let mut inline_is = None;230		let mut events = None;231		let mut expect_selector = None;232		// TODO: create proc-macro to optimize proc-macro boilerplate? :D233		loop {234			let lookahead = input.lookahead1();235			if lookahead.peek(kw::name) {236				let k = input.parse::<kw::name>()?;237				input.parse::<Token![=]>()?;238				if name.replace(input.parse::<Ident>()?).is_some() {239					return Err(syn::Error::new(k.span(), "name is already set"));240				}241			} else if lookahead.peek(kw::is) {242				let k = input.parse::<kw::is>()?;243				let contents;244				parenthesized!(contents in input);245				if is.replace(contents.parse::<IsList>()?).is_some() {246					return Err(syn::Error::new(k.span(), "is is already set"));247				}248			} else if lookahead.peek(kw::inline_is) {249				let k = input.parse::<kw::inline_is>()?;250				let contents;251				parenthesized!(contents in input);252				if inline_is.replace(contents.parse::<IsList>()?).is_some() {253					return Err(syn::Error::new(k.span(), "inline_is is already set"));254				}255			} else if lookahead.peek(kw::events) {256				let k = input.parse::<kw::events>()?;257				let contents;258				parenthesized!(contents in input);259				if events.replace(contents.parse::<IsList>()?).is_some() {260					return Err(syn::Error::new(k.span(), "events is already set"));261				}262			} else if lookahead.peek(kw::expect_selector) {263				let k = input.parse::<kw::expect_selector>()?;264				input.parse::<Token![=]>()?;265				let value = input.parse::<LitInt>()?;266				if expect_selector267					.replace(value.base10_parse::<u32>()?)268					.is_some()269				{270					return Err(syn::Error::new(k.span(), "expect_selector is already set"));271				}272			} else if input.is_empty() {273				break;274			} else {275				return Err(lookahead.error());276			}277			if input.peek(Token![,]) {278				input.parse::<Token![,]>()?;279			} else {280				break;281			}282		}283		Ok(Self {284			name: name.ok_or_else(|| syn::Error::new(input.span(), "missing name"))?,285			is: is.unwrap_or_default(),286			inline_is: inline_is.unwrap_or_default(),287			events: events.unwrap_or_default(),288			expect_selector,289		})290	}291}292293struct MethodInfo {294	rename_selector: Option<String>,295	hide: bool,296}297impl Parse for MethodInfo {298	fn parse(input: ParseStream) -> syn::Result<Self> {299		let mut rename_selector = None;300		let mut hide = false;301		while !input.is_empty() {302			let lookahead = input.lookahead1();303			if lookahead.peek(kw::rename_selector) {304				let k = input.parse::<kw::rename_selector>()?;305				input.parse::<Token![=]>()?;306				if rename_selector307					.replace(input.parse::<LitStr>()?.value())308					.is_some()309				{310					return Err(syn::Error::new(k.span(), "rename_selector is already set"));311				}312			} else if lookahead.peek(kw::hide) {313				input.parse::<kw::hide>()?;314				hide = true;315			} else {316				return Err(lookahead.error());317			}318319			if input.peek(Token![,]) {320				input.parse::<Token![,]>()?;321			} else if !input.is_empty() {322				return Err(syn::Error::new(input.span(), "expected end"));323			}324		}325		Ok(Self {326			rename_selector,327			hide,328		})329	}330}331332trait AbiType {333	fn plain(&self) -> syn::Result<&Ident>;334	fn is_value(&self) -> bool;335	fn is_caller(&self) -> bool;336	fn is_special(&self) -> bool;337}338339impl AbiType for Type {340	fn plain(&self) -> syn::Result<&Ident> {341		let path = parse_path(self)?;342		let segment = parse_path_segment(path)?;343		if !segment.arguments.is_empty() {344			return Err(syn::Error::new(self.span(), "Not plain type"));345		}346		Ok(&segment.ident)347	}348349	fn is_value(&self) -> bool {350		if let Ok(ident) = self.plain() {351			return ident == "value";352		}353		false354	}355356	fn is_caller(&self) -> bool {357		if let Ok(ident) = self.plain() {358			return ident == "caller";359		}360		false361	}362363	fn is_special(&self) -> bool {364		self.is_caller() || self.is_value()365	}366}367368#[derive(Debug)]369struct MethodArg {370	name: Ident,371	camel_name: String,372	ty: Type,373}374impl MethodArg {375	fn try_from(value: &PatType) -> syn::Result<Self> {376		let name = parse_ident_from_pat(&value.pat)?.clone();377		Ok(Self {378			camel_name: cases::camelcase::to_camel_case(&name.to_string()),379			name,380			ty: value.ty.as_ref().clone(),381		})382	}383	fn is_value(&self) -> bool {384		self.ty.is_value()385	}386	fn is_caller(&self) -> bool {387		self.ty.is_caller()388	}389	fn is_special(&self) -> bool {390		self.ty.is_special()391	}392393	fn expand_call_def(&self) -> proc_macro2::TokenStream {394		assert!(!self.is_special());395		let name = &self.name;396		let ty = &self.ty;397398		quote! {399			#name: #ty400		}401	}402403	fn expand_parse(&self) -> proc_macro2::TokenStream {404		assert!(!self.is_special());405		let name = &self.name;406		let ty = &self.ty;407		quote! {408			#name: <#ty>::abi_read(reader)?409		}410	}411412	fn expand_call_arg(&self) -> proc_macro2::TokenStream {413		if self.is_value() {414			quote! {415				c.value.clone()416			}417		} else if self.is_caller() {418			quote! {419				c.caller.clone()420			}421		} else {422			let name = &self.name;423			quote! {424				#name425			}426		}427	}428429	fn expand_solidity_argument(&self) -> proc_macro2::TokenStream {430		let camel_name = &self.camel_name.to_string();431		let ty = &self.ty;432		quote! {433			<NamedArgument<#ty>>::new(#camel_name)434		}435	}436}437438#[derive(PartialEq)]439enum Mutability {440	Mutable,441	View,442	Pure,443}444445/// Group all keywords for this macro. Usage example:446/// #[solidity_interface(name = "B", inline_is(A))]447mod kw {448	syn::custom_keyword!(weight);449450	syn::custom_keyword!(via);451	syn::custom_keyword!(returns);452	syn::custom_keyword!(name);453	syn::custom_keyword!(is);454	syn::custom_keyword!(inline_is);455	syn::custom_keyword!(events);456	syn::custom_keyword!(expect_selector);457458	syn::custom_keyword!(rename_selector);459	syn::custom_keyword!(hide);460}461462/// Rust methods are parsed into this structure when Solidity code is generated463struct Method {464	name: Ident,465	camel_name: String,466	pascal_name: Ident,467	screaming_name: Ident,468	hide: bool,469	args: Vec<MethodArg>,470	has_normal_args: bool,471	has_value_args: bool,472	mutability: Mutability,473	result: Type,474	weight: Option<Expr>,475	docs: Vec<String>,476}477impl Method {478	fn try_from(value: &ImplItemMethod) -> syn::Result<Self> {479		let mut info = MethodInfo {480			rename_selector: None,481			hide: false,482		};483		let mut docs = Vec::new();484		let mut weight = None;485		for attr in &value.attrs {486			let ident = parse_ident_from_path(&attr.path, false)?;487			if ident == "solidity" {488				info = attr.parse_args::<MethodInfo>()?;489			} else if ident == "doc" {490				let args = attr.parse_meta().unwrap();491				let value = match args {492					Meta::NameValue(MetaNameValue {493						lit: Lit::Str(str), ..494					}) => str.value(),495					_ => unreachable!(),496				};497				docs.push(value);498			} else if ident == "weight" {499				weight = Some(attr.parse_args::<Expr>()?);500			}501		}502		let ident = &value.sig.ident;503		let ident_str = ident.to_string();504		if !cases::snakecase::is_snake_case(&ident_str) {505			return Err(syn::Error::new(ident.span(), "method name should be snake_cased\nif alternative solidity name needs to be set - use #[solidity] attribute"));506		}507508		let mut mutability = Mutability::Pure;509510		if let Some(FnArg::Receiver(receiver)) = value511			.sig512			.inputs513			.iter()514			.find(|arg| matches!(arg, FnArg::Receiver(_)))515		{516			if receiver.reference.is_none() {517				return Err(syn::Error::new(518					receiver.span(),519					"receiver should be by ref",520				));521			}522			if receiver.mutability.is_some() {523				mutability = Mutability::Mutable;524			} else {525				mutability = Mutability::View;526			}527		}528		let mut args = Vec::new();529		for typ in value530			.sig531			.inputs532			.iter()533			.filter(|arg| matches!(arg, FnArg::Typed(_)))534		{535			let typ = match typ {536				FnArg::Typed(typ) => typ,537				_ => unreachable!(),538			};539			args.push(MethodArg::try_from(typ)?);540		}541542		if mutability != Mutability::Mutable && args.iter().any(|arg| arg.is_value()) {543			return Err(syn::Error::new(544				args.iter().find(|arg| arg.is_value()).unwrap().ty.span(),545				"payable function should be mutable",546			));547		}548549		let result = match &value.sig.output {550			ReturnType::Type(_, ty) => ty,551			_ => return Err(syn::Error::new(value.sig.output.span(), "interface method should return Result<value>\nif there is no value to return - specify void (which is alias to unit)")),552		};553		let result = parse_result_ok(result)?;554555		let camel_name = info556			.rename_selector557			.unwrap_or_else(|| cases::camelcase::to_camel_case(&ident.to_string()));558		let has_normal_args = args.iter().filter(|arg| !arg.is_special()).count() != 0;559		let has_value_args = args.iter().any(|a| a.is_value());560561		Ok(Self {562			name: ident.clone(),563			camel_name,564			pascal_name: snake_ident_to_pascal(ident),565			screaming_name: snake_ident_to_screaming(ident),566			hide: info.hide,567			args,568			has_normal_args,569			has_value_args,570			mutability,571			result: result.clone(),572			weight,573			docs,574		})575	}576	fn expand_call_def(&self) -> proc_macro2::TokenStream {577		let defs = self578			.args579			.iter()580			.filter(|a| !a.is_special())581			.map(|a| a.expand_call_def());582		let pascal_name = &self.pascal_name;583		let docs = &self.docs;584585		if self.has_normal_args {586			quote! {587				#(#[doc = #docs])*588				#[allow(missing_docs)]589				#pascal_name {590					#(591						#defs,592					)*593				}594			}595		} else {596			quote! {#pascal_name}597		}598	}599600	fn expand_const(&self) -> proc_macro2::TokenStream {601		let screaming_name = &self.screaming_name;602		let screaming_name_signature = format_ident!("{}_SIGNATURE", &self.screaming_name);603		let custom_signature = self.expand_custom_signature();604		quote! {605			const #screaming_name_signature: ::evm_coder::custom_signature::FunctionSignature = #custom_signature;606			const #screaming_name: ::evm_coder::types::bytes4 = {607				let mut sum = ::evm_coder::sha3_const::Keccak256::new();608				let mut pos = 0;609				while pos < Self::#screaming_name_signature.unit.len {610					sum = sum.update(&[Self::#screaming_name_signature.unit.data[pos]; 1]);611					pos += 1;612				}613				let a = sum.finalize();614				[a[0], a[1], a[2], a[3]]615			};616		}617	}618619	fn expand_interface_id(&self) -> proc_macro2::TokenStream {620		let screaming_name = &self.screaming_name;621		quote! {622			interface_id ^= u32::from_be_bytes(Self::#screaming_name);623		}624	}625626	fn expand_parse(&self) -> proc_macro2::TokenStream {627		let pascal_name = &self.pascal_name;628		let screaming_name = &self.screaming_name;629		if self.has_normal_args {630			let parsers = self631				.args632				.iter()633				.filter(|a| !a.is_special())634				.map(|a| a.expand_parse());635			quote! {636				Self::#screaming_name => return Ok(Some(Self::#pascal_name {637					#(638						#parsers,639					)*640				}))641			}642		} else {643			quote! { Self::#screaming_name => return Ok(Some(Self::#pascal_name)) }644		}645	}646647	fn expand_variant_call(&self, call_name: &proc_macro2::Ident) -> proc_macro2::TokenStream {648		let pascal_name = &self.pascal_name;649		let name = &self.name;650651		let matcher = if self.has_normal_args {652			let names = self653				.args654				.iter()655				.filter(|a| !a.is_special())656				.map(|a| &a.name);657658			quote! {{659				#(660					#names,661				)*662			}}663		} else {664			quote! {}665		};666667		let receiver = match self.mutability {668			Mutability::Mutable | Mutability::View => quote! {self.},669			Mutability::Pure => quote! {Self::},670		};671		let args = self.args.iter().map(|a| a.expand_call_arg());672673		quote! {674			#call_name::#pascal_name #matcher => {675				let result = #receiver #name(676					#(677						#args,678					)*679				)?;680				(&result).to_result()681			}682		}683	}684685	fn expand_variant_weight(&self) -> proc_macro2::TokenStream {686		let pascal_name = &self.pascal_name;687		if let Some(weight) = &self.weight {688			let matcher = if self.has_normal_args {689				let names = self690					.args691					.iter()692					.filter(|a| !a.is_special())693					.map(|a| &a.name);694695				quote! {{696					#(697						#names,698					)*699				}}700			} else {701				quote! {}702			};703			quote! {704				Self::#pascal_name #matcher => (#weight).into()705			}706		} else {707			let matcher = if self.has_normal_args {708				quote! {{..}}709			} else {710				quote! {}711			};712			quote! {713				Self::#pascal_name #matcher => ().into()714			}715		}716	}717718	fn expand_type(ty: &Type, token_stream: &mut proc_macro2::TokenStream, read_signature: bool) {719		match ty {720			Type::Path(tp) => {721				if let Some(qself) = &tp.qself {722					panic!("no receiver expected {:?}", qself.ty.span());723				}724				let path = &tp.path;725				if path.segments.len() != 1 {726					panic!("expected path to have only one segment {:?}", path.span());727				}728				let last_segment = path.segments.last().unwrap();729730				if last_segment.ident == "Vec" {731					let args = match &last_segment.arguments {732						PathArguments::AngleBracketed(e) => e,733						_ => {734							panic!("missing Vec generic {:?}", last_segment.arguments.span());735						}736					};737					let args = &args.args;738					if args.len() != 1 {739						panic!("expected only one generic for vec {:?}", args.span());740					}741					let arg = args.first().expect("first arg");742743					let ty = match arg {744						GenericArgument::Type(ty) => ty,745						_ => {746							panic!("expected first generic to be type {:?}", arg.span());747						}748					};749750					let mut vec_token = proc_macro2::TokenStream::new();751					Self::expand_type(ty, &mut vec_token, false);752					vec_token = if read_signature {753						quote! { (<Vec<#vec_token>>::SIGNATURE) }754					} else {755						quote! { <Vec<#vec_token>> }756					};757					token_stream.extend(vec_token);758				} else {759					if !last_segment.arguments.is_empty() {760						panic!(761							"unexpected generic arguments for non-vec type {:?}",762							last_segment.arguments.span()763						);764					}765766					let ident = &last_segment.ident;767					let plain_token = if read_signature {768						quote! {769							(<#ident>::SIGNATURE)770						}771					} else {772						quote! {773							#ident774						}775					};776777					token_stream.extend(plain_token);778				}779			}780781			Type::Tuple(tt) => {782				// for ty in tt.elems.iter() {783				// 	out.push(AbiType::try_from(ty)?)784				// }785786				let mut tuple_types = proc_macro2::TokenStream::new();787				let mut is_first = true;788789				for ty in tt.elems.iter() {790					if is_first {791						is_first = false792					} else {793						tuple_types.extend(quote!(,));794					}795					Self::expand_type(ty, &mut tuple_types, false);796				}797				tuple_types = if read_signature {798					quote! { (<(#tuple_types)>::SIGNATURE) }799				} else {800					quote! { (#tuple_types) }801				};802				token_stream.extend(tuple_types);803			}804805			// Type::Array(arr) => {806			// 	let wrapped = AbiType::try_from(&arr.elem)?;807			// 	match &arr.len {808			// 		Expr::Lit(l) => match &l.lit {809			// 			Lit::Int(i) => {810			// 				let num = i.base10_parse::<usize>()?;811			// 				Ok(AbiType::Array(Box::new(wrapped), num as usize))812			// 			}813			// 			_ => Err(syn::Error::new(arr.len.span(), "should be int literal")),814			// 		},815			// 		_ => Err(syn::Error::new(arr.len.span(), "should be literal")),816			// 	}817			// }818			_ => panic!("Unexpected type {ty:?}"),819		}820		// match ty {821		// 	AbiType::Plain(ref ident) => {822		// 		let plain_token = if read_signature {823		// 			quote! {824		// 				(<#ident>::SIGNATURE)825		// 			}826		// 		} else {827		// 			quote! {828		// 				#ident829		// 			}830		// 		};831832		// 		token_stream.extend(plain_token);833		// 	}834835		// 	AbiType::Tuple(ref tuple_type) => {836		// 		let mut tuple_types = proc_macro2::TokenStream::new();837		// 		let mut is_first = true;838839		// 		for ty in tuple_type {840		// 			if is_first {841		// 				is_first = false842		// 			} else {843		// 				tuple_types.extend(quote!(,));844		// 			}845		// 			Self::expand_type(ty, &mut tuple_types, false);846		// 		}847		// 		tuple_types = if read_signature {848		// 			quote! { (<(#tuple_types)>::SIGNATURE) }849		// 		} else {850		// 			quote! { (#tuple_types) }851		// 		};852		// 		token_stream.extend(tuple_types);853		// 	}854855		// 	AbiType::Vec(ref vec_type) => {856		// 		let mut vec_token = proc_macro2::TokenStream::new();857		// 		Self::expand_type(vec_type.as_ref(), &mut vec_token, false);858		// 		vec_token = if read_signature {859		// 			quote! { (<Vec<#vec_token>>::SIGNATURE) }860		// 		} else {861		// 			quote! { <Vec<#vec_token>> }862		// 		};863		// 		token_stream.extend(vec_token);864		// 	}865866		// 	AbiType::Array(_, _) => todo!("Array eth signature"),867		// };868	}869870	fn expand_custom_signature(&self) -> proc_macro2::TokenStream {871		let mut token_stream = TokenStream::new();872873		let mut is_first = true;874		for arg in &self.args {875			if arg.is_special() {876				continue;877			}878879			if is_first {880				is_first = false;881			} else {882				token_stream.extend(quote!(,));883			}884			Self::expand_type(&arg.ty, &mut token_stream, true);885		}886887		if !is_first {888			token_stream.extend(quote!(,));889		}890891		let func_name = self.camel_name.clone();892		let func_name = quote!(SignaturePreferences {893			open_name: Some(SignatureUnit::new(#func_name)),894			open_delimiter: Some(SignatureUnit::new("(")),895			param_delimiter: Some(SignatureUnit::new(",")),896			close_delimiter: Some(SignatureUnit::new(")")),897			close_name: None,898		});899		quote!({ ::evm_coder::make_signature!(new fn(#func_name), #token_stream) })900	}901902	fn expand_solidity_function(&self) -> proc_macro2::TokenStream {903		let camel_name = &self.camel_name;904		let mutability = match self.mutability {905			Mutability::Mutable => quote! {SolidityMutability::Mutable},906			Mutability::View => quote! { SolidityMutability::View },907			Mutability::Pure => quote! {SolidityMutability::Pure},908		};909		let result = &self.result;910911		let args = self912			.args913			.iter()914			.filter(|a| !a.is_special())915			.map(MethodArg::expand_solidity_argument);916		let docs = &self.docs;917		let screaming_name = &self.screaming_name;918		let hide = self.hide;919		let custom_signature = self.expand_custom_signature();920		let custom_signature = quote!(921			{922				const cs: FunctionSignature = #custom_signature;923				cs924			}925		);926		let is_payable = self.has_value_args;927928		quote! {929			SolidityFunction {930				docs: &[#(#docs),*],931				hide: #hide,932				selector: u32::from_be_bytes(Self::#screaming_name),933				custom_signature: #custom_signature,934				name: #camel_name,935				mutability: #mutability,936				is_payable: #is_payable,937				args: (938					#(939						#args,940					)*941				),942				result: <UnnamedArgument<#result>>::default(),943			}944		}945	}946}947948fn generics_list(gen: &Generics) -> proc_macro2::TokenStream {949	if gen.params.is_empty() {950		return quote! {};951	}952	let params = gen.params.iter().map(|p| match p {953		syn::GenericParam::Type(id) => {954			let v = &id.ident;955			quote! {#v}956		}957		syn::GenericParam::Lifetime(lt) => {958			let v = &lt.lifetime;959			quote! {#v}960		}961		syn::GenericParam::Const(c) => {962			let i = &c.ident;963			quote! {#i}964		}965	});966	quote! { #(#params),* }967}968fn generics_reference(gen: &Generics) -> proc_macro2::TokenStream {969	if gen.params.is_empty() {970		return quote! {};971	}972	let list = generics_list(gen);973	quote! { <#list> }974}975fn generics_data(gen: &Generics) -> proc_macro2::TokenStream {976	let list = generics_list(gen);977	if gen.params.len() == 1 {978		quote! {#list}979	} else {980		quote! { (#list) }981	}982}983984pub struct SolidityInterface {985	generics: Generics,986	name: Box<syn::Type>,987	info: InterfaceInfo,988	methods: Vec<Method>,989	docs: Vec<String>,990}991impl SolidityInterface {992	pub fn try_from(info: InterfaceInfo, value: &ItemImpl) -> syn::Result<Self> {993		let mut methods = Vec::new();994995		for item in &value.items {996			if let ImplItem::Method(method) = item {997				methods.push(Method::try_from(method)?)998			}999		}1000		let mut docs = vec![];1001		for attr in &value.attrs {1002			let ident = parse_ident_from_path(&attr.path, false)?;1003			if ident == "doc" {1004				let args = attr.parse_meta().unwrap();1005				let value = match args {1006					Meta::NameValue(MetaNameValue {1007						lit: Lit::Str(str), ..1008					}) => str.value(),1009					_ => unreachable!(),1010				};1011				docs.push(value);1012			}1013		}1014		Ok(Self {1015			generics: value.generics.clone(),1016			name: value.self_ty.clone(),1017			info,1018			methods,1019			docs,1020		})1021	}1022	pub fn expand(self) -> proc_macro2::TokenStream {1023		let name = self.name;10241025		let solidity_name = self.info.name.to_string();1026		let call_name = pascal_ident_to_call(&self.info.name);1027		let generics = self.generics;1028		let gen_ref = generics_reference(&generics);1029		let gen_data = generics_data(&generics);1030		let gen_where = &generics.where_clause;10311032		let call_sub = self1033			.info1034			.inline_is1035			.01036			.iter()1037			.chain(self.info.is.0.iter())1038			.map(|c| Is::expand_call_def(c, &gen_ref));1039		let call_parse = self1040			.info1041			.inline_is1042			.01043			.iter()1044			.chain(self.info.is.0.iter())1045			.map(|is| Is::expand_parse(is, &gen_ref));1046		let call_variants = self1047			.info1048			.inline_is1049			.01050			.iter()1051			.chain(self.info.is.0.iter())1052			.map(|c| Is::expand_variant_call(c, &call_name, &gen_ref));1053		let weight_variants = self1054			.info1055			.inline_is1056			.01057			.iter()1058			.chain(self.info.is.0.iter())1059			.map(Is::expand_variant_weight);10601061		let inline_interface_id = self.info.inline_is.0.iter().map(Is::expand_interface_id);1062		let supports_interface = self1063			.info1064			.is1065			.01066			.iter()1067			.map(|is| Is::expand_supports_interface(is, &gen_ref));10681069		let calls = self.methods.iter().map(Method::expand_call_def);1070		let consts = self.methods.iter().map(Method::expand_const);1071		let interface_id = self.methods.iter().map(Method::expand_interface_id);1072		let parsers = self.methods.iter().map(Method::expand_parse);1073		let call_variants_this = self1074			.methods1075			.iter()1076			.map(|m| Method::expand_variant_call(m, &call_name));1077		let weight_variants_this = self.methods.iter().map(Method::expand_variant_weight);1078		let solidity_functions = self.methods.iter().map(Method::expand_solidity_function);10791080		// TODO: Inline inline_is1081		let solidity_is = self1082			.info1083			.is1084			.01085			.iter()1086			.chain(self.info.inline_is.0.iter())1087			.map(|is| is.name.to_string());1088		let solidity_events_is = self.info.events.0.iter().map(|is| is.name.to_string());1089		let solidity_generators = self1090			.info1091			.is1092			.01093			.iter()1094			.chain(self.info.inline_is.0.iter())1095			.map(|is| Is::expand_generator(is, &gen_ref));1096		let solidity_event_generators = self.info.events.0.iter().map(Is::expand_event_generator);10971098		let docs = &self.docs;10991100		quote! {1101			#[derive(Debug)]1102			#(#[doc = #docs])*1103			pub enum #call_name #gen_ref {1104				/// Inherited method1105				ERC165Call(::evm_coder::ERC165Call, ::core::marker::PhantomData<#gen_data>),1106				#(1107					#calls,1108				)*1109				#(1110					#call_sub,1111				)*1112			}1113			impl #gen_ref #call_name #gen_ref {1114				#(1115					#consts1116				)*1117				/// Return this call ERC165 selector1118				pub fn interface_id() -> ::evm_coder::types::bytes4 {1119					let mut interface_id = 0;1120					#(#interface_id)*1121					#(#inline_interface_id)*1122					u32::to_be_bytes(interface_id)1123				}1124				/// Generate solidity definitions for methods described in this interface1125				pub fn generate_solidity_interface(tc: &evm_coder::solidity::TypeCollector, is_impl: bool) {1126					use evm_coder::solidity::*;1127					use core::fmt::Write;1128					let interface = SolidityInterface {1129						docs: &[#(#docs),*],1130						name: #solidity_name,1131						selector: Self::interface_id(),1132						is: &["Dummy", "ERC165", #(1133							#solidity_is,1134						)* #(1135							#solidity_events_is,1136						)* ],1137						functions: (#(1138							#solidity_functions,1139						)*),1140					};11411142					let mut out = ::evm_coder::types::string::new();1143					if #solidity_name.starts_with("Inline") {1144						out.push_str("/// @dev inlined interface\n");1145					}1146					let _ = interface.format(is_impl, &mut out, tc);1147					tc.collect(out);1148					#(1149						#solidity_event_generators1150					)*1151					#(1152						#solidity_generators1153					)*1154					if is_impl {1155						tc.collect("/// @dev common stubs holder\ncontract Dummy {\n\tuint8 dummy;\n\tstring stub_error = \"this contract is implemented in native\";\n}\ncontract ERC165 is Dummy {\n\tfunction supportsInterface(bytes4 interfaceID) external view returns (bool) {\n\t\trequire(false, stub_error);\n\t\tinterfaceID;\n\t\treturn true;\n\t}\n}\n".into());1156					} else {1157						tc.collect("/// @dev common stubs holder\ninterface Dummy {\n}\ninterface ERC165 is Dummy {\n\tfunction supportsInterface(bytes4 interfaceID) external view returns (bool);\n}\n".into());1158					}1159				}1160			}1161			impl #gen_ref ::evm_coder::Call for #call_name #gen_ref {1162				fn parse(method_id: ::evm_coder::types::bytes4, reader: &mut ::evm_coder::abi::AbiReader) -> ::evm_coder::execution::Result<Option<Self>> {1163					use ::evm_coder::abi::AbiRead;1164					match method_id {1165						::evm_coder::ERC165Call::INTERFACE_ID => return Ok(1166							::evm_coder::ERC165Call::parse(method_id, reader)?1167							.map(|c| Self::ERC165Call(c, ::core::marker::PhantomData))1168						),1169						#(1170							#parsers,1171						)*1172						_ => {},1173					}1174					#(1175						#call_parse1176					)else*1177					return Ok(None);1178				}1179			}1180			impl #generics #call_name #gen_ref1181			#gen_where1182			{1183				/// Is this contract implements specified ERC165 selector1184				pub fn supports_interface(this: &#name, interface_id: ::evm_coder::types::bytes4) -> bool {1185					interface_id != u32::to_be_bytes(0xffffff) && (1186						interface_id == ::evm_coder::ERC165Call::INTERFACE_ID ||1187						interface_id == Self::interface_id()1188						#(1189							|| #supports_interface1190						)*1191					)1192				}1193			}1194			impl #generics ::evm_coder::Weighted for #call_name #gen_ref1195			#gen_where1196			{1197				#[allow(unused_variables)]1198				fn weight(&self) -> ::evm_coder::execution::DispatchInfo {1199					match self {1200						#(1201							#weight_variants,1202						)*1203						// TODO: It should be very cheap, but not free1204						Self::ERC165Call(::evm_coder::ERC165Call::SupportsInterface {..}, _) => ::frame_support::weights::Weight::from_ref_time(100).into(),1205						#(1206							#weight_variants_this,1207						)*1208					}1209				}1210			}1211			impl #generics ::evm_coder::Callable<#call_name #gen_ref> for #name1212			#gen_where1213			{1214				#[allow(unreachable_code)] // In case of no inner calls1215				fn call(&mut self, c: Msg<#call_name #gen_ref>) -> ::evm_coder::execution::ResultWithPostInfo<::evm_coder::abi::AbiWriter> {1216					use ::evm_coder::abi::AbiWrite;1217					match c.call {1218						#(1219							#call_variants,1220						)*1221						#call_name::ERC165Call(::evm_coder::ERC165Call::SupportsInterface {interface_id}, _) => {1222							let mut writer = ::evm_coder::abi::AbiWriter::default();1223							writer.bool(&<#call_name #gen_ref>::supports_interface(self, interface_id));1224							return Ok(writer.into());1225						}1226						_ => {},1227					}1228					let mut writer = ::evm_coder::abi::AbiWriter::default();1229					match c.call {1230						#(1231							#call_variants_this,1232						)*1233						_ => Err(::evm_coder::execution::Error::from("method is not available").into()),1234					}1235				}1236			}1237		}1238	}1239}