{ "fileName": "ERC20Burnable.sol", "contractName": "ERC20Burnable", "source": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"../../GSN/Context.sol\";\nimport \"./ERC20.sol\";\n\n/**\n * @dev Extension of {ERC20} that allows token holders to destroy both their own\n * tokens and those that they have an allowance for, in a way that can be\n * recognized off-chain (via event analysis).\n */\nabstract contract ERC20Burnable is Context, ERC20 {\n using SafeMath for uint256;\n\n /**\n * @dev Destroys `amount` tokens from the caller.\n *\n * See {ERC20-_burn}.\n */\n function burn(uint256 amount) public virtual {\n _burn(_msgSender(), amount);\n }\n\n /**\n * @dev Destroys `amount` tokens from `account`, deducting from the caller's\n * allowance.\n *\n * See {ERC20-_burn} and {ERC20-allowance}.\n *\n * Requirements:\n *\n * - the caller must have allowance for ``accounts``'s tokens of at least\n * `amount`.\n */\n function burnFrom(address account, uint256 amount) public virtual {\n uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, \"ERC20: burn amount exceeds allowance\");\n\n _approve(account, _msgSender(), decreasedAllowance);\n _burn(account, amount);\n }\n}\n", "sourcePath": "contracts/token/ERC20/ERC20Burnable.sol", "sourceMap": "", "deployedSourceMap": "", "abi": [ { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "address", "name": "owner", "type": "address" }, { "indexed": true, "internalType": "address", "name": "spender", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "Approval", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "address", "name": "from", "type": "address" }, { "indexed": true, "internalType": "address", "name": "to", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "Transfer", "type": "event" }, { "inputs": [ { "internalType": "address", "name": "owner", "type": "address" }, { "internalType": "address", "name": "spender", "type": "address" } ], "name": "allowance", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "approve", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "account", "type": "address" } ], "name": "balanceOf", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "burn", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "account", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "burnFrom", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [], "name": "decimals", "outputs": [ { "internalType": "uint8", "name": "", "type": "uint8" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "subtractedValue", "type": "uint256" } ], "name": "decreaseAllowance", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "addedValue", "type": "uint256" } ], "name": "increaseAllowance", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [], "name": "name", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "symbol", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "totalSupply", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "recipient", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "transfer", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "sender", "type": "address" }, { "internalType": "address", "name": "recipient", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "transferFrom", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" } ], "ast": { "absolutePath": "contracts/token/ERC20/ERC20Burnable.sol", "exportedSymbols": { "ERC20Burnable": [ 9253 ] }, "id": 9254, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 9196, "literals": [ "solidity", "^", "0.7", ".0" ], "nodeType": "PragmaDirective", "src": "33:23:85" }, { "absolutePath": "contracts/GSN/Context.sol", "file": "../../GSN/Context.sol", "id": 9197, "nodeType": "ImportDirective", "scope": 9254, "sourceUnit": 23, "src": "58:31:85", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "contracts/token/ERC20/ERC20.sol", "file": "./ERC20.sol", "id": 9198, "nodeType": "ImportDirective", "scope": 9254, "sourceUnit": 9195, "src": "90:21:85", "symbolAliases": [], "unitAlias": "" }, { "abstract": true, "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 9200, "name": "Context", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 22, "src": "357:7:85", "typeDescriptions": { "typeIdentifier": "t_contract$_Context_$22", "typeString": "contract Context" } }, "id": 9201, "nodeType": "InheritanceSpecifier", "src": "357:7:85" }, { "arguments": null, "baseName": { "contractScope": null, "id": 9202, "name": "ERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 9194, "src": "366:5:85", "typeDescriptions": { "typeIdentifier": "t_contract$_ERC20_$9194", "typeString": "contract ERC20" } }, "id": 9203, "nodeType": "InheritanceSpecifier", "src": "366:5:85" } ], "contractDependencies": [ 22, 9194, 9779 ], "contractKind": "contract", "documentation": { "id": 9199, "nodeType": "StructuredDocumentation", "src": "113:208:85", "text": " @dev Extension of {ERC20} that allows token holders to destroy both their own\n tokens and those that they have an allowance for, in a way that can be\n recognized off-chain (via event analysis)." }, "fullyImplemented": false, "id": 9253, "linearizedBaseContracts": [ 9253, 9194, 9779, 22 ], "name": "ERC20Burnable", "nodeType": "ContractDefinition", "nodes": [ { "id": 9206, "libraryName": { "contractScope": null, "id": 9204, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 2421, "src": "384:8:85", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$2421", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "378:27:85", "typeName": { "id": 9205, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "397:7:85", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "body": { "id": 9218, "nodeType": "Block", "src": "559:44:85", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "id": 9213, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10, "src": "575:10:85", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_payable_$", "typeString": "function () view returns (address payable)" } }, "id": 9214, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "575:12:85", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "id": 9215, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9209, "src": "589:6:85", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 9212, "name": "_burn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9126, "src": "569:5:85", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,uint256)" } }, "id": 9216, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "569:27:85", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 9217, "nodeType": "ExpressionStatement", "src": "569:27:85" } ] }, "documentation": { "id": 9207, "nodeType": "StructuredDocumentation", "src": "411:98:85", "text": " @dev Destroys `amount` tokens from the caller.\n See {ERC20-_burn}." }, "functionSelector": "42966c68", "id": 9219, "implemented": true, "kind": "function", "modifiers": [], "name": "burn", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 9210, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 9209, "mutability": "mutable", "name": "amount", "nodeType": "VariableDeclaration", "overrides": null, "scope": 9219, "src": "528:14:85", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 9208, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "528:7:85", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "527:16:85" }, "returnParameters": { "id": 9211, "nodeType": "ParameterList", "parameters": [], "src": "559:0:85" }, "scope": 9253, "src": "514:89:85", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "body": { "id": 9251, "nodeType": "Block", "src": "975:224:85", "statements": [ { "assignments": [ 9228 ], "declarations": [ { "constant": false, "id": 9228, "mutability": "mutable", "name": "decreasedAllowance", "nodeType": "VariableDeclaration", "overrides": null, "scope": 9251, "src": "985:26:85", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 9227, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "985:7:85", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 9238, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 9235, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9224, "src": "1051:6:85", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "hexValue": "45524332303a206275726e20616d6f756e74206578636565647320616c6c6f77616e6365", "id": 9236, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "1059:38:85", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_a287c363786607a1457a2d9d12fa61c0073358e02d76b4035fc2c2d86a19c0db", "typeString": "literal_string \"ERC20: burn amount exceeds allowance\"" }, "value": "ERC20: burn amount exceeds allowance" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_stringliteral_a287c363786607a1457a2d9d12fa61c0073358e02d76b4035fc2c2d86a19c0db", "typeString": "literal_string \"ERC20: burn amount exceeds allowance\"" } ], "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 9230, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9222, "src": "1024:7:85", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "id": 9231, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10, "src": "1033:10:85", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_payable_$", "typeString": "function () view returns (address payable)" } }, "id": 9232, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1033:12:85", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address_payable", "typeString": "address payable" } ], "id": 9229, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 8833, "src": "1014:9:85", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view returns (uint256)" } }, "id": 9233, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1014:32:85", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 9234, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "sub", "nodeType": "MemberAccess", "referencedDeclaration": 2299, "src": "1014:36:85", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$_t_string_memory_ptr_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256,string memory) pure returns (uint256)" } }, "id": 9237, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1014:84:85", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "985:113:85" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 9240, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9222, "src": "1118:7:85", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "id": 9241, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10, "src": "1127:10:85", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_payable_$", "typeString": "function () view returns (address payable)" } }, "id": 9242, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1127:12:85", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "id": 9243, "name": "decreasedAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9228, "src": "1141:18:85", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 9239, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9171, "src": "1109:8:85", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 9244, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1109:51:85", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 9245, "nodeType": "ExpressionStatement", "src": "1109:51:85" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 9247, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9222, "src": "1176:7:85", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 9248, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9224, "src": "1185:6:85", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 9246, "name": "_burn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9126, "src": "1170:5:85", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,uint256)" } }, "id": 9249, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1170:22:85", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 9250, "nodeType": "ExpressionStatement", "src": "1170:22:85" } ] }, "documentation": { "id": 9220, "nodeType": "StructuredDocumentation", "src": "609:295:85", "text": " @dev Destroys `amount` tokens from `account`, deducting from the caller's\n allowance.\n See {ERC20-_burn} and {ERC20-allowance}.\n Requirements:\n - the caller must have allowance for ``accounts``'s tokens of at least\n `amount`." }, "functionSelector": "79cc6790", "id": 9252, "implemented": true, "kind": "function", "modifiers": [], "name": "burnFrom", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 9225, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 9222, "mutability": "mutable", "name": "account", "nodeType": "VariableDeclaration", "overrides": null, "scope": 9252, "src": "927:15:85", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 9221, "name": "address", "nodeType": "ElementaryTypeName", "src": "927:7:85", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 9224, "mutability": "mutable", "name": "amount", "nodeType": "VariableDeclaration", 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