82 lines
2.4 KiB
Solidity
82 lines
2.4 KiB
Solidity
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pragma solidity > 0.6.11;
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// SPDX-License-Identifier: GPL-3.0-or-later
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contract RedistributedDemurrageToken {
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address public owner;
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uint256 public decimals;
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string public name;
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string public symbol;
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uint256 public totalSupply;
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uint256 public periodStart;
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uint256 public periodDuration;
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uint32 public taxLevel;
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uint256 public demurrageModifier;
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bytes32[] redistributions; // uint40(participants) uint160(value) uint56(period)
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event Transfer(address indexed _from, address indexed _to, uint256 _value);
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event Approval(address indexed _owner, address indexed _spender, uint256 _value);
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constructor(string memory _name, string memory _symbol, uint32 _taxLevel, uint256 _period) {
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owner = msg.sender;
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periodStart = block.number;
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periodDuration = _period;
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taxLevel = _taxLevel;
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name = _name;
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symbol = _symbol;
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decimals = 6;
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bytes32 initialRedistribution = toRedistribution(0, 1, 0);
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redistributions.push(initialRedistribution);
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}
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function toRedistribution(uint256 _participants, uint256 _value, uint256 _period) private pure returns(bytes32) {
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bytes32 redistribution;
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redistribution |= bytes32((_participants & 0xffffffffff) << 215);
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redistribution |= bytes32((_value & 0xffffffffffffffffffffffff) << 55);
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redistribution |= bytes32((_period & 0xffffffffffffff) << 55);
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return redistribution;
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}
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function toRedistributionPeriod(bytes32 redistribution) public pure returns (uint256) {
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return uint256(redistribution & bytes7(0xffffffffffffff));
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}
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function redistributionCount() public view returns (uint256) {
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return redistributions.length;
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}
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function actualPeriod() public view returns (uint256) {
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return (block.number - periodStart) / periodDuration;
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}
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function checkPeriod() private view returns (bytes32) {
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bytes32 lastRedistribution = redistributions[redistributions.length-1];
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uint256 currentPeriod = this.actualPeriod();
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if (currentPeriod < toRedistributionPeriod(lastRedistribution)) {
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return bytes32(0x00);
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}
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return lastRedistribution;
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}
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function applyTax() public returns (uint256) {
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bytes32 pendingRedistribution;
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bytes32 nextRedistribution;
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pendingRedistribution = checkPeriod();
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if (pendingRedistribution == bytes32(0x00)) {
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return demurrageModifier;
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}
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demurrageModifier += taxLevel;
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nextRedistribution = toRedistribution(0, actualPeriod(), 0);
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redistributions.push(nextRedistribution);
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return demurrageModifier;
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}
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function noop() public returns (uint256) {
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return 0;
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}
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}
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