{
    "Function": "_calculateSaleReturn",
    "File": "contracts/Bancor/BancorFormula.sol",
    "Parent Contracts": [],
    "High-Level Calls": [
        "SafeMath",
        "SafeMath"
    ],
    "Internal Calls": [
        "power",
        "require(bool)"
    ],
    "Library Calls": [
        "mul",
        "mul"
    ],
    "Low-Level Calls": [],
    "Code": "function _calculateSaleReturn(uint256 _supply, uint256 _connectorBalance, uint32 _connectorWeight, uint256 _sellAmount) internal view returns (uint256) {\n        // validate input\n        require(_supply > 0 && _connectorBalance > 0 && _connectorWeight > 0 && _connectorWeight <= MAX_WEIGHT && _sellAmount <= _supply);\n\n        // special case for 0 sell amount\n        if (_sellAmount == 0)\n            return 0;\n\n        // special case for selling the entire supply\n        if (_sellAmount == _supply)\n            return _connectorBalance;\n\n        // special case if the weight = 100%\n        if (_connectorWeight == MAX_WEIGHT)\n            return _connectorBalance.mul(_sellAmount) / _supply;\n\n        uint256 result;\n        uint8 precision;\n        uint256 baseD = _supply - _sellAmount;\n        (result, precision) = power(_supply, baseD, MAX_WEIGHT, _connectorWeight);\n        uint256 temp1 = _connectorBalance.mul(result);\n        uint256 temp2 = _connectorBalance << precision;\n        return (temp1 - temp2) / result;\n    }"
}