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git://holbrook.no/erc20-demurrage-token
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Add preliminary code comments
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@ -15,8 +15,8 @@ contract RedistributedDemurrageToken {
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uint256 public taxLevel; // PPM
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uint256 public demurrageModifier; // PPM
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bytes32[] public redistributions; // uint40(participants) uint160(value) uint56(period)
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mapping (address => bytes32) account;
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bytes32[] public redistributions; // uint40(participants) | uint160(value) | uint56(period)
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mapping (address => bytes32) account; // uint12(period) | uint160(value)
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mapping (address => bool) minter;
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event Transfer(address indexed _from, address indexed _to, uint256 _value);
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@ -40,12 +40,14 @@ contract RedistributedDemurrageToken {
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redistributions.push(initialRedistribution);
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}
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/// Given address will be allowed to call the mintTo() function
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function addMinter(address _minter) public returns (bool) {
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require(msg.sender == owner);
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minter[_minter] = true;
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return true;
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}
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/// ERC20
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function balanceOf(address _account) public view returns (uint256) {
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uint256 baseBalance = getBaseBalance(_account);
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uint256 inverseModifier = 1000000 - demurrageModifier;
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@ -53,10 +55,12 @@ contract RedistributedDemurrageToken {
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return baseBalance - balanceModifier;
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}
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/// Balance unmodified by demurrage
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function getBaseBalance(address _account) private view returns (uint256) {
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return uint256(account[_account]) & 0x00ffffffffffffffffffffffffffffffffffffffff;
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}
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/// Increases base balance for a single account
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function increaseBalance(address _account, uint256 _delta) private returns (bool) {
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uint256 oldBalance;
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uint256 newBalance;
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@ -68,6 +72,7 @@ contract RedistributedDemurrageToken {
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return true;
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}
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/// Decreases base balance for a single account
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function decreaseBalance(address _account, uint256 _delta) private returns (bool) {
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uint256 oldBalance;
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uint256 newBalance;
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@ -80,6 +85,8 @@ contract RedistributedDemurrageToken {
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return true;
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}
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// Creates new tokens out of thin air, and allocates them to the given address
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// Triggers tax
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function mintTo(address _beneficiary, uint256 _amount) external returns (bool) {
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require(minter[msg.sender]);
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@ -92,6 +99,7 @@ contract RedistributedDemurrageToken {
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return true;
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}
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// Deserializes the redistribution word
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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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@ -101,22 +109,27 @@ contract RedistributedDemurrageToken {
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return redistribution;
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}
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// Serializes the demurrage period part of the redistribution word
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function toRedistributionPeriod(bytes32 redistribution) public pure returns (uint256) {
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return uint256(redistribution & 0x00000000000000000000000000000000000000000000000000ffffffffffffff);
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}
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// Serializes the supply part of the redistribution word
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function toRedistributionSupply(bytes32 redistribution) public pure returns (uint256) {
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return uint256(redistribution & 0x0000000000ffffffffffffffffffffffffffffffffffffffff00000000000000) >> 56;
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}
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// Serializes the number of participants part of the redistribution word
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function toRedistributionParticipants(bytes32 redistribution) public pure returns (uint256) {
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return uint256(redistribution & 0xffffffffff000000000000000000000000000000000000000000000000000000) >> 216;
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}
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// Client accessor to the redistributions array length
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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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// Add number of participants for the current redistribution period by one
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function incrementRedistributionParticipants() private returns (bool) {
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uint256 currentRedistribution;
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uint256 participants;
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@ -130,6 +143,7 @@ contract RedistributedDemurrageToken {
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redistributions[redistributions.length-1] = bytes32(currentRedistribution);
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}
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// Save the current total supply amount to the current redistribution period
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function saveRedistributionSupply() private returns (bool) {
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uint256 currentRedistribution;
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@ -140,10 +154,12 @@ contract RedistributedDemurrageToken {
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redistributions[redistributions.length-1] = bytes32(currentRedistribution);
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}
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// Get the demurrage period of the current block number
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function actualPeriod() public view returns (uint256) {
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return (block.number - periodStart) / periodDuration + 1;
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}
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// Add an entered demurrage period to the redistribution array
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function checkPeriod() private view returns (bytes32) {
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bytes32 lastRedistribution;
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uint256 currentPeriod;
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@ -156,16 +172,20 @@ contract RedistributedDemurrageToken {
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return lastRedistribution;
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}
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// Deserialize the pemurrage period for the given account is participating in
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function accountPeriod(address _account) public returns (uint256) {
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return (uint256(account[_account]) & 0xffffffffffffffffffffffff0000000000000000000000000000000000000000) >> 160;
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}
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// Save the given demurrage period as the currently participation period for the given address
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function registerAccountPeriod(address _account, uint256 _period) private returns (bool) {
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account[_account] &= 0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff;
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account[_account] |= bytes32(_period << 160);
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incrementRedistributionParticipants();
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}
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// Recalculate the demurrage modifier for the new period
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// After this, all REPORTED balances will have been reduced by the corresponding ratio (but the totalsupply stays the same)
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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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@ -183,6 +203,7 @@ contract RedistributedDemurrageToken {
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return demurrageModifier;
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}
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// Calculate a value reduced by demurrage by the given period
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function toTaxPeriodAmount(uint256 _value, uint256 _period) public view returns (uint256) {
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uint256 valueFactor;
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@ -196,6 +217,8 @@ contract RedistributedDemurrageToken {
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return (valueFactor * _value) / 1000000;
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}
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// If the given account is participating in a period and that period has been crossed
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// THEN increase the base value of the account with its share of the value reduction of the period
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function applyRedistributionOnAccount(address _account) public returns (bool) {
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bytes32 periodRedistribution;
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uint256 supply;
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@ -226,6 +249,7 @@ contract RedistributedDemurrageToken {
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return true;
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}
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// ERC20, triggers tax and/or redistribution
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function transfer(address _to, uint256 _value) public returns (bool) {
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uint256 baseValue;
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bool result;
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@ -240,6 +264,7 @@ contract RedistributedDemurrageToken {
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return result;
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}
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// ERC20 transfer backend for transfer, transferFrom
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function transferBase(address _from, address _to, uint256 _value) private returns (bool) {
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uint256 period;
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