From d604f6b14137feedd779f0b32b63266bd9a6ff8c Mon Sep 17 00:00:00 2001
From: Yaroslav Bolyukin <iam@lach.pw>
Date: Tue, 20 Jul 2021 17:25:52 +0000
Subject: [PATCH] feat: implement new solidity interface generator


---
--- /dev/null
+++ b/crates/evm-coder/src/solidity.rs
@@ -0,0 +1,161 @@
+use core::{fmt, marker::PhantomData};
+use impl_trait_for_tuples::impl_for_tuples;
+use crate::types::*;
+
+pub trait SolidityTypeName: 'static {
+	fn solidity_name(writer: &mut impl fmt::Write) -> fmt::Result;
+	fn is_void() -> bool {
+		false
+	}
+}
+
+macro_rules! solidity_type_name {
+    ($($ty:ident => $name:expr),* $(,)?) => {
+        $(
+            impl SolidityTypeName for $ty {
+                fn solidity_name(writer: &mut impl core::fmt::Write) -> core::fmt::Result {
+                    write!(writer, $name)
+                }
+            }
+        )*
+    };
+}
+
+solidity_type_name! {
+	uint8 => "uint8",
+	address => "address",
+	string => "memory string",
+}
+impl SolidityTypeName for void {
+	fn solidity_name(_writer: &mut impl fmt::Write) -> fmt::Result {
+		Ok(())
+	}
+	fn is_void() -> bool {
+		true
+	}
+}
+
+pub trait SolidityArguments {
+	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result;
+	fn is_empty(&self) -> bool {
+		self.len() == 0
+	}
+	fn len(&self) -> usize;
+}
+
+pub struct UnnamedArgument<T>(PhantomData<*const T>);
+
+impl<T: SolidityTypeName> SolidityArguments for UnnamedArgument<T> {
+	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+		if !T::is_void() {
+			T::solidity_name(writer)
+		} else {
+			Ok(())
+		}
+	}
+	fn len(&self) -> usize {
+		if T::is_void() {
+			0
+		} else {
+			1
+		}
+	}
+}
+
+pub struct NamedArgument<T>(&'static str, PhantomData<*const T>);
+
+impl<T: SolidityTypeName> SolidityArguments for NamedArgument<T> {
+	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+		if !T::is_void() {
+			T::solidity_name(writer)?;
+			write!(writer, " {}", self.0)
+		} else {
+			Ok(())
+		}
+	}
+	fn len(&self) -> usize {
+		if T::is_void() {
+			0
+		} else {
+			1
+		}
+	}
+}
+
+impl SolidityArguments for () {
+	fn solidity_name(&self, _writer: &mut impl fmt::Write) -> fmt::Result {
+		Ok(())
+	}
+	fn len(&self) -> usize {
+		0
+	}
+}
+
+#[impl_for_tuples(1, 5)]
+impl SolidityArguments for Tuple {
+	for_tuples!( where #( Tuple: SolidityArguments ),* );
+
+	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+		let mut first = false;
+		for_tuples!( #(
+            if !Tuple.is_empty() {
+                if first {
+                    write!(writer, ", ")?;
+                }
+                first = false;
+                Tuple.solidity_name(writer)?;
+            }
+        )* );
+		Ok(())
+	}
+	fn len(&self) -> usize {
+		for_tuples!( #( Tuple.len() )+* )
+	}
+}
+
+trait SolidityFunctions {
+	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result;
+}
+
+pub enum SolidityMutability {
+	Pure,
+	View,
+	Mutable,
+}
+pub struct SolidityFunction<A, R> {
+	name: &'static str,
+	args: A,
+	result: R,
+	mutability: SolidityMutability,
+}
+impl<A: SolidityArguments, R: SolidityArguments> SolidityFunctions for SolidityFunction<A, R> {
+	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+		write!(writer, "function {}(", self.name)?;
+		self.args.solidity_name(writer)?;
+		write!(writer, ") public")?;
+		match &self.mutability {
+			SolidityMutability::Pure => write!(writer, " pure")?,
+			SolidityMutability::View => write!(writer, " view")?,
+			SolidityMutability::Mutable => {}
+		}
+		if !self.result.is_empty() {
+			write!(writer, "returns (")?;
+			self.result.solidity_name(writer)?;
+			write!(writer, ")")?;
+		}
+		writeln!(writer, ";")
+	}
+}
+
+#[impl_for_tuples(0, 12)]
+impl SolidityFunctions for Tuple {
+	for_tuples!( where #( Tuple: SolidityFunctions ),* );
+
+	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+		let mut first = false;
+		for_tuples!( #(
+            Tuple.solidity_name(writer)?;
+        )* );
+		Ok(())
+	}
+}

-- 
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