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"source": "pragma solidity =0.6.6;\n\nimport '../libraries/SafeMath.sol';\n\ncontract ERC20 {\n using SafeMath for uint;\n\n string public constant name = 'Test Token';\n string public constant symbol = 'TT';\n uint8 public constant decimals = 18;\n uint public totalSupply;\n mapping(address => uint) public balanceOf;\n mapping(address => mapping(address => uint)) public allowance;\n\n bytes32 public DOMAIN_SEPARATOR;\n // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\");\n bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\n mapping(address => uint) public nonces;\n\n event Approval(address indexed owner, address indexed spender, uint value);\n event Transfer(address indexed from, address indexed to, uint value);\n\n constructor(uint _totalSupply) public {\n uint chainId;\n assembly {\n chainId := chainid()\n }\n DOMAIN_SEPARATOR = keccak256(\n abi.encode(\n keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),\n keccak256(bytes(name)),\n keccak256(bytes('1')),\n chainId,\n address(this)\n )\n );\n _mint(msg.sender, _totalSupply);\n }\n\n function _mint(address to, uint value) internal {\n totalSupply = totalSupply.add(value);\n balanceOf[to] = balanceOf[to].add(value);\n emit Transfer(address(0), to, value);\n }\n\n function _burn(address from, uint value) internal {\n balanceOf[from] = balanceOf[from].sub(value);\n totalSupply = totalSupply.sub(value);\n emit Transfer(from, address(0), value);\n }\n\n function _approve(address owner, address spender, uint value) private {\n allowance[owner][spender] = value;\n emit Approval(owner, spender, value);\n }\n\n function _transfer(address from, address to, uint value) private {\n balanceOf[from] = balanceOf[from].sub(value);\n balanceOf[to] = balanceOf[to].add(value);\n emit Transfer(from, to, value);\n }\n\n function approve(address spender, uint value) external returns (bool) {\n _approve(msg.sender, spender, value);\n return true;\n }\n\n function transfer(address to, uint value) external returns (bool) {\n _transfer(msg.sender, to, value);\n return true;\n }\n\n function transferFrom(address from, address to, uint value) external returns (bool) {\n if (allowance[from][msg.sender] != uint(-1)) {\n allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);\n }\n _transfer(from, to, value);\n return true;\n }\n\n function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {\n require(deadline >= block.timestamp, 'EXPIRED');\n bytes32 digest = keccak256(\n abi.encodePacked(\n '\\x19\\x01',\n DOMAIN_SEPARATOR,\n keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))\n )\n );\n address recoveredAddress = ecrecover(digest, v, r, s);\n require(recoveredAddress != address(0) && recoveredAddress == owner, 'INVALID_SIGNATURE');\n _approve(owner, spender, value);\n }\n}\n", "sourcePath": "/Users/warrenmason/Documents/UniswapV3Contracts/Core/LiveContracts/Moonwalkerswap-v2-periphery/contracts/test/ERC20.sol", "ast": { "absolutePath": "/Users/warrenmason/Documents/UniswapV3Contracts/Core/LiveContracts/Moonwalkerswap-v2-periphery/contracts/test/ERC20.sol", "exportedSymbols": { "ERC20": [ 6179 ] }, "id": 6180, "nodeType": "SourceUnit", "nodes": [ { "id": 5784, "literals": [ "solidity", "=", "0.6", ".6" ], "nodeType": "PragmaDirective", "src": "0:23:15" }, { "absolutePath": "/Users/warrenmason/Documents/UniswapV3Contracts/Core/LiveContracts/Moonwalkerswap-v2-periphery/contracts/libraries/SafeMath.sol", "file": "../libraries/SafeMath.sol", "id": 5785, "nodeType": "ImportDirective", "scope": 6180, "sourceUnit": 5368, "src": "25:35:15", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "id": 6179, "linearizedBaseContracts": [ 6179 ], "name": "ERC20", "nodeType": "ContractDefinition", "nodes": [ { "id": 5788, "libraryName": { "contractScope": null, "id": 5786, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5367, "src": "89:8:15", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$5367", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "83:24:15", "typeName": { "id": 5787, "name": "uint", "nodeType": "ElementaryTypeName", "src": "102:4:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "constant": true, "functionSelector": "06fdde03", "id": 5791, "mutability": "constant", "name": "name", "nodeType": "VariableDeclaration", "overrides": null, "scope": 6179, "src": "113:42:15", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 5789, "name": "string", "nodeType": "ElementaryTypeName", "src": "113:6:15", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "value": { "argumentTypes": null, "hexValue": "5465737420546f6b656e", "id": 5790, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "143:12:15", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_81e8ad438398ab0d4a2a7ecb159490c091bb27c67ace5181f70084e30fadaea2", "typeString": "literal_string \"Test Token\"" }, "value": "Test Token" }, "visibility": "public" }, { "constant": true, "functionSelector": "95d89b41", "id": 5794, "mutability": "constant", "name": "symbol", "nodeType": "VariableDeclaration", "overrides": null, "scope": 6179, "src": "161:36:15", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 5792, "name": "string", "nodeType": "ElementaryTypeName", "src": "161:6:15", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "value": { "argumentTypes": null, "hexValue": "5454", "id": 5793, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "193:4:15", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_2ac50a34f0da9360cfd7e529a34ccdaa61aa98e2a0ac0928bf981af8e73352ba", "typeString": "literal_string \"TT\"" }, "value": "TT" }, "visibility": "public" }, { "constant": true, "functionSelector": "313ce567", "id": 5797, "mutability": "constant", "name": "decimals", "nodeType": "VariableDeclaration", "overrides": null, "scope": 6179, "src": "203:35:15", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 5795, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "203:5:15", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": { "argumentTypes": null, "hexValue": "3138", "id": 5796, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "236:2:15", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_18_by_1", "typeString": "int_const 18" }, "value": "18" }, "visibility": "public" }, { "constant": false, "functionSelector": "18160ddd", "id": 5799, "mutability": "mutable", "name": "totalSupply", "nodeType": "VariableDeclaration", "overrides": null, "scope": 6179, "src": "244:24:15", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 5798, "name": "uint", "nodeType": "ElementaryTypeName", "src": "244:4:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, 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