solidity/test/externalTests/solc-js/DAO/Token.sol
cd10012 16fe59b7b4 Implement @erak review notes by creating function and adding constructor test
Update 060 doc with natspec change

Add two more tests with mixed usage

Fix solc-js

fix changelog
2019-11-06 21:44:59 +01:00

151 lines
5.6 KiB
Solidity

/*
This file is part of the DAO.
The DAO is free software: you can redistribute it and/or modify
it under the terms of the GNU lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The DAO is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU lesser General Public License for more details.
You should have received a copy of the GNU lesser General Public License
along with the DAO. If not, see <http://www.gnu.org/licenses/>.
*/
/*
Basic, standardized Token contract with no "premine". Defines the functions to
check token balances, send tokens, send tokens on behalf of a 3rd party and the
corresponding approval process. Tokens need to be created by a derived
contract (e.g. TokenCreation.sol).
Thank you ConsenSys, this contract originated from:
https://github.com/ConsenSys/Tokens/blob/master/Token_Contracts/contracts/Standard_Token.sol
Which is itself based on the Ethereum standardized contract APIs:
https://github.com/ethereum/wiki/wiki/Standardized_Contract_APIs
*/
/// @title Standard Token Contract.
abstract contract TokenInterface {
mapping (address => uint256) balances;
mapping (address => mapping (address => uint256)) allowed;
/// Public variables of the token, all used for display
string public name;
string public symbol;
uint8 public decimals;
string public standard = 'Token 0.1';
/// Total amount of tokens
uint256 public totalSupply;
/// @param _owner The address from which the balance will be retrieved
/// @return balance The balance
function balanceOf(address _owner) public view returns (uint256 balance);
/// @notice Send `_amount` tokens to `_to` from `msg.sender`
/// @param _to The address of the recipient
/// @param _amount The amount of tokens to be transferred
/// @return success Whether the transfer was successful or not
function transfer(address _to, uint256 _amount) public returns (bool success);
/// @notice Send `_amount` tokens to `_to` from `_from` on the condition it
/// is approved by `_from`
/// @param _from The address of the origin of the transfer
/// @param _to The address of the recipient
/// @param _amount The amount of tokens to be transferred
/// @return success Whether the transfer was successful or not
function transferFrom(address _from, address _to, uint256 _amount) public returns (bool success);
/// @notice `msg.sender` approves `_spender` to spend `_amount` tokens on
/// its behalf
/// @param _spender The address of the account able to transfer the tokens
/// @param _amount The amount of tokens to be approved for transfer
/// @return success Whether the approval was successful or not
function approve(address _spender, uint256 _amount) public returns (bool success);
/// @param _owner The address of the account owning tokens
/// @param _spender The address of the account able to transfer the tokens
/// @return remaining Amount of remaining tokens of _owner that _spender is allowed
/// to spend
function allowance(
address _owner,
address _spender
) public view returns (uint256 remaining);
event Transfer(address indexed _from, address indexed _to, uint256 _amount);
event Approval(
address indexed _owner,
address indexed _spender,
uint256 _amount
);
}
abstract contract tokenRecipient {
function receiveApproval(address _from, uint256 _value, address _token, bytes memory _extraData) public;
}
contract Token is TokenInterface {
// Protects users by preventing the execution of method calls that
// inadvertently also transferred ether
modifier noEther() {if (msg.value > 0) revert(); _; }
function balanceOf(address _owner) public override view returns (uint256 balance) {
return balances[_owner];
}
function transfer(address _to, uint256 _amount) public override returns (bool success) {
if (balances[msg.sender] >= _amount && _amount > 0) {
balances[msg.sender] -= _amount;
balances[_to] += _amount;
emit Transfer(msg.sender, _to, _amount);
return true;
} else {
return false;
}
}
function transferFrom(
address _from,
address _to,
uint256 _amount
) public override returns (bool success) {
if (balances[_from] >= _amount
&& allowed[_from][msg.sender] >= _amount
&& _amount > 0) {
balances[_to] += _amount;
balances[_from] -= _amount;
allowed[_from][msg.sender] -= _amount;
emit Transfer(_from, _to, _amount);
return true;
} else {
return false;
}
}
function approve(address _spender, uint256 _amount) public override returns (bool success) {
allowed[msg.sender][_spender] = _amount;
emit Approval(msg.sender, _spender, _amount);
return true;
}
/// Allow another contract to spend some tokens in your behalf
function approveAndCall(address _spender, uint256 _value, bytes memory _extraData)
public returns (bool success) {
allowed[msg.sender][_spender] = _value;
tokenRecipient spender = tokenRecipient(_spender);
spender.receiveApproval(msg.sender, _value, address(this), _extraData);
return true;
}
function allowance(address _owner, address _spender) public override view returns (uint256 remaining) {
return allowed[_owner][_spender];
}
}