refactor: use ERC20 component

contracts/.tool-versions

@@ -0,0 +1,2 @@
+scarb 2.3.1
+starknet-foundry 0.12.0

contracts/Scarb.toml

@@ -18,3 +18,6 @@ allowed-libfuncs-list.name = "experimental"
 
 [cairo]
 sierra-replace-ids = true
+
+[tool.fmt]
+sort-module-level-items = true

contracts/src/lib.cairo

@@ -1,3 +1,4 @@
 mod tokens {
+    mod interface;
     mod memecoin;
 }

contracts/src/tokens/interface.cairo

@@ -0,0 +1,65 @@
+use openzeppelin::token::erc20::interface::{IERC20Metadata, IERC20, IERC20Camel};
+use starknet::ContractAddress;
+
+
+#[starknet::interface]
+trait IUnruggableMemecoin<TState> {
+    // ************************************
+    // * Metadata
+    // ************************************
+    fn name(self: @TState) -> felt252;
+    fn symbol(self: @TState) -> felt252;
+    fn decimals(self: @TState) -> u8;
+
+    // ************************************
+    // * snake_case
+    // ************************************
+    fn total_supply(self: @TState) -> u256;
+    fn balance_of(self: @TState, account: ContractAddress) -> u256;
+    fn allowance(self: @TState, owner: ContractAddress, spender: ContractAddress) -> u256;
+    fn transfer(ref self: TState, recipient: ContractAddress, amount: u256) -> bool;
+    fn transfer_from(
+        ref self: TState, sender: ContractAddress, recipient: ContractAddress, amount: u256
+    ) -> bool;
+    fn approve(ref self: TState, spender: ContractAddress, amount: u256) -> bool;
+
+    // ************************************
+    // * camelCase
+    // ************************************
+    fn totalSupply(self: @TState) -> u256;
+    fn balanceOf(self: @TState, account: ContractAddress) -> u256;
+    fn transferFrom(
+        ref self: TState, sender: ContractAddress, recipient: ContractAddress, amount: u256
+    ) -> bool;
+
+    // ************************************
+    // * Additional functions
+    // ************************************
+    fn launch_memecoin(ref self: TState);
+}
+
+#[starknet::interface]
+trait IUnruggableMemecoinCamel<TState> {
+    fn totalSupply(self: @TState) -> u256;
+    fn balanceOf(self: @TState, account: ContractAddress) -> u256;
+    fn transferFrom(
+        ref self: TState, sender: ContractAddress, recipient: ContractAddress, amount: u256
+    ) -> bool;
+}
+
+#[starknet::interface]
+trait IUnruggableMemecoinSnake<TState> {
+    fn total_supply(self: @TState) -> u256;
+    fn balance_of(self: @TState, account: ContractAddress) -> u256;
+    fn allowance(self: @TState, owner: ContractAddress, spender: ContractAddress) -> u256;
+    fn transfer(ref self: TState, recipient: ContractAddress, amount: u256) -> bool;
+    fn transfer_from(
+        ref self: TState, sender: ContractAddress, recipient: ContractAddress, amount: u256
+    ) -> bool;
+    fn approve(ref self: TState, spender: ContractAddress, amount: u256) -> bool;
+}
+
+#[starknet::interface]
+trait IUnruggableAdditional<TState> {
+    fn launch_memecoin(ref self: TState);
+}

contracts/src/tokens/memecoin.cairo

@@ -1,48 +1,32 @@
 //! `UnruggableMemecoin` is an ERC20 token has additional features to prevent rug pulls.
 use starknet::ContractAddress;
 
-#[starknet::interface]
-trait IUnruggableMemecoin<TState> {
-    // ************************************
-    // * Standard ERC20 functions
-    // ************************************
-    fn name(self: @TState) -> felt252;
-    fn symbol(self: @TState) -> felt252;
-    fn decimals(self: @TState) -> u8;
-    fn total_supply(self: @TState) -> u256;
-    fn balance_of(self: @TState, account: ContractAddress) -> u256;
-    fn allowance(self: @TState, owner: ContractAddress, spender: ContractAddress) -> u256;
-    fn transfer(ref self: TState, recipient: ContractAddress, amount: u256) -> bool;
-    fn transfer_from(
-        ref self: TState, sender: ContractAddress, recipient: ContractAddress, amount: u256
-    ) -> bool;
-    fn approve(ref self: TState, spender: ContractAddress, amount: u256) -> bool;
-    // ************************************
-    // * Additional functions
-    // ************************************
-    fn launch_memecoin(ref self: TState);
-}
 
 #[starknet::contract]
 mod UnruggableMemecoin {
-    // Core dependencies.
-    use openzeppelin::access::ownable::ownable::OwnableComponent::InternalTrait;
     use integer::BoundedInt;
+    use openzeppelin::access::ownable::OwnableComponent;
+    use openzeppelin::access::ownable::ownable::OwnableComponent::InternalTrait;
+    use openzeppelin::token::erc20::ERC20Component;
     use starknet::{ContractAddress, get_caller_address};
+    use unruggable::tokens::interface::{
+        IUnruggableMemecoinSnake, IUnruggableMemecoinCamel, IUnruggableAdditional
+    };
     use zeroable::Zeroable;
 
-    // External dependencies.
-    use openzeppelin::access::ownable::OwnableComponent;
-
-    // Internal dependencies.
-    use super::IUnruggableMemecoin;
-
     // Components.
     component!(path: OwnableComponent, storage: ownable, event: OwnableEvent);
     impl OwnableInternalImpl = OwnableComponent::InternalImpl<ContractState>;
 
+    component!(path: ERC20Component, storage: erc20, event: ERC20Event);
+    // Internals
+    impl ERC20InternalImpl = ERC20Component::InternalImpl<ContractState>;
+
+    // ERC20 entrypoints.
+    #[abi(embed_v0)]
+    impl ERC20MetadataImpl = ERC20Component::ERC20MetadataImpl<ContractState>;
+
     // Constants.
-    const DECIMALS: u8 = 18;
     /// The maximum number of holders allowed before launch.
     /// This is to prevent the contract from being launched with a large number of holders.
     /// Once reached, transfers are disabled until the memecoin is launched.
@@ -56,38 +40,22 @@ mod UnruggableMemecoin {
     #[storage]
     struct Storage {
         marker_v_0: (),
-        name: felt252,
-        symbol: felt252,
-        total_supply: u256,
-        balances: LegacyMap<ContractAddress, u256>,
-        allowances: LegacyMap<(ContractAddress, ContractAddress), u256>,
         // Components.
         #[substorage(v0)]
-        ownable: OwnableComponent::Storage
+        ownable: OwnableComponent::Storage,
+        #[substorage(v0)]
+        erc20: ERC20Component::Storage
     }
 
     #[event]
     #[derive(Drop, starknet::Event)]
     enum Event {
-        Transfer: Transfer,
-        Approval: Approval,
         #[flat]
-        OwnableEvent: OwnableComponent::Event
+        OwnableEvent: OwnableComponent::Event,
+        #[flat]
+        ERC20Event: ERC20Component::Event
     }
 
-    #[derive(Drop, starknet::Event)]
-    struct Transfer {
-        from: ContractAddress,
-        to: ContractAddress,
-        value: u256
-    }
-
-    #[derive(Drop, starknet::Event)]
-    struct Approval {
-        owner: ContractAddress,
-        spender: ContractAddress,
-        value: u256
-    }
 
     /// Constructor called once when the contract is deployed.
     /// # Arguments
@@ -106,20 +74,20 @@ mod UnruggableMemecoin {
         initial_supply: u256
     ) {
         // Initialize the ERC20 token.
-        self.initializer(name, symbol);
+        self.erc20.initializer(name, symbol);
 
         // Initialize the owner.
         self.ownable.initializer(owner);
 
         // Mint initial supply to the initial recipient.
-        self._mint(initial_recipient, initial_supply);
+        self.erc20._mint(initial_recipient, initial_supply);
     }
 
     //
     // External
     //
     #[abi(embed_v0)]
-    impl UnruggableMemecoinImpl of IUnruggableMemecoin<ContractState> {
+    impl UnruggableEntrypoints of IUnruggableAdditional<ContractState> {
         // ************************************
         // * UnruggableMemecoin functions
         // ************************************
@@ -130,34 +98,25 @@ mod UnruggableMemecoin {
 
         // Interactions.
         }
+    }
 
+    #[abi(embed_v0)]
+    impl SnakeEntrypoints of IUnruggableMemecoinSnake<ContractState> {
         // ************************************
-        // * Standard ERC20 functions
+        // * snake_case functions
         // ************************************
-        fn name(self: @ContractState) -> felt252 {
-            self.name.read()
-        }
-
-        fn symbol(self: @ContractState) -> felt252 {
-            self.symbol.read()
-        }
-
-        fn decimals(self: @ContractState) -> u8 {
-            DECIMALS
-        }
-
         fn total_supply(self: @ContractState) -> u256 {
-            self.total_supply.read()
+            self.erc20.ERC20_total_supply.read()
         }
 
         fn balance_of(self: @ContractState, account: ContractAddress) -> u256 {
-            self.balances.read(account)
+            self.erc20.ERC20_balances.read(account)
         }
 
         fn allowance(
             self: @ContractState, owner: ContractAddress, spender: ContractAddress
         ) -> u256 {
-            self.allowances.read((owner, spender))
+            self.erc20.ERC20_allowances.read((owner, spender))
         }
 
         fn transfer(ref self: ContractState, recipient: ContractAddress, amount: u256) -> bool {
@@ -173,119 +132,52 @@ mod UnruggableMemecoin {
             amount: u256
         ) -> bool {
             let caller = get_caller_address();
-            self._spend_allowance(sender, caller, amount);
-            self._transfer(sender, recipient, amount);
+            self.erc20._spend_allowance(sender, caller, amount);
+            self.erc20._transfer(sender, recipient, amount);
             true
         }
 
         fn approve(ref self: ContractState, spender: ContractAddress, amount: u256) -> bool {
             let caller = get_caller_address();
-            self._approve(caller, spender, amount);
+            self.erc20._approve(caller, spender, amount);
             true
         }
     }
 
-    #[external(v0)]
-    fn increase_allowance(
-        ref self: ContractState, spender: ContractAddress, added_value: u256
-    ) -> bool {
-        self._increase_allowance(spender, added_value)
-    }
-
-    #[external(v0)]
-    fn increaseAllowance(
-        ref self: ContractState, spender: ContractAddress, addedValue: u256
-    ) -> bool {
-        increase_allowance(ref self, spender, addedValue)
-    }
-
-    #[external(v0)]
-    fn decrease_allowance(
-        ref self: ContractState, spender: ContractAddress, subtracted_value: u256
-    ) -> bool {
-        self._decrease_allowance(spender, subtracted_value)
-    }
-
-    #[external(v0)]
-    fn decreaseAllowance(
-        ref self: ContractState, spender: ContractAddress, subtractedValue: u256
-    ) -> bool {
-        decrease_allowance(ref self, spender, subtractedValue)
-    }
-
-    //
-    // Internal
-    //
-
-    #[generate_trait]
-    impl UnruggableMemecoinInternalImpl of UnruggableMemecoinInternalTrait {
-        fn initializer(ref self: ContractState, name_: felt252, symbol_: felt252) {
-            self.name.write(name_);
-            self.symbol.write(symbol_);
+    #[abi(embed_v0)]
+    impl CamelEntrypoints of IUnruggableMemecoinCamel<ContractState> {
+        fn totalSupply(self: @ContractState) -> u256 {
+            self.erc20.ERC20_total_supply.read()
         }
-
-        fn _increase_allowance(
-            ref self: ContractState, spender: ContractAddress, added_value: u256
-        ) -> bool {
-            let caller = get_caller_address();
-            self._approve(caller, spender, self.allowances.read((caller, spender)) + added_value);
-            true
+        fn balanceOf(self: @ContractState, account: ContractAddress) -> u256 {
+            self.erc20.ERC20_balances.read(account)
         }
-
-        fn _decrease_allowance(
-            ref self: ContractState, spender: ContractAddress, subtracted_value: u256
+        fn transferFrom(
+            ref self: ContractState,
+            sender: ContractAddress,
+            recipient: ContractAddress,
+            amount: u256
         ) -> bool {
             let caller = get_caller_address();
-            self
-                ._approve(
-                    caller, spender, self.allowances.read((caller, spender)) - subtracted_value
-                );
+            self.erc20._spend_allowance(sender, caller, amount);
+            self._transfer(sender, recipient, amount);
             true
         }
+    }
 
-        fn _mint(ref self: ContractState, recipient: ContractAddress, amount: u256) {
-            assert(!recipient.is_zero(), 'ERC20: mint to 0');
-            self.total_supply.write(self.total_supply.read() + amount);
-            self.balances.write(recipient, self.balances.read(recipient) + amount);
-            self.emit(Transfer { from: Zeroable::zero(), to: recipient, value: amount });
-        }
-
-        fn _burn(ref self: ContractState, account: ContractAddress, amount: u256) {
-            assert(!account.is_zero(), 'ERC20: burn from 0');
-            self.total_supply.write(self.total_supply.read() - amount);
-            self.balances.write(account, self.balances.read(account) - amount);
-            self.emit(Transfer { from: account, to: Zeroable::zero(), value: amount });
-        }
-
-        fn _approve(
-            ref self: ContractState, owner: ContractAddress, spender: ContractAddress, amount: u256
-        ) {
-            assert(!owner.is_zero(), 'ERC20: approve from 0');
-            assert(!spender.is_zero(), 'ERC20: approve to 0');
-            self.allowances.write((owner, spender), amount);
-            self.emit(Approval { owner, spender, value: amount });
-        }
 
+    //
+    // Internal
+    //
+    #[generate_trait]
+    impl UnruggableMemecoinInternalImpl of UnruggableMemecoinInternalTrait {
         fn _transfer(
             ref self: ContractState,
             sender: ContractAddress,
             recipient: ContractAddress,
             amount: u256
         ) {
-            assert(!sender.is_zero(), 'ERC20: transfer from 0');
-            assert(!recipient.is_zero(), 'ERC20: transfer to 0');
-            self.balances.write(sender, self.balances.read(sender) - amount);
-            self.balances.write(recipient, self.balances.read(recipient) + amount);
-            self.emit(Transfer { from: sender, to: recipient, value: amount });
-        }
-
-        fn _spend_allowance(
-            ref self: ContractState, owner: ContractAddress, spender: ContractAddress, amount: u256
-        ) {
-            let current_allowance = self.allowances.read((owner, spender));
-            if current_allowance != BoundedInt::max() {
-                self._approve(owner, spender, current_allowance - amount);
-            }
+            self.erc20._transfer(sender, recipient, amount);
         }
     }
 }