openzeppelin-contracts/contracts/mocks/ERC165/ERC165InterfacesSupported.sol

pragma solidity ^0.4.24;

import "../../introspection/IERC165.sol";

/**
 * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-214.md#specification
 * > Any attempts to make state-changing operations inside an execution instance with STATIC set to true will instead throw an exception.
 * > These operations include [...], LOG0, LOG1, LOG2, [...]
 *
 * therefore, because this contract is staticcall'd we need to not emit events (which is how solidity-coverage works)
 * solidity-coverage ignores the /mocks folder, so we duplicate its implementation here to avoid instrumenting it
 */
contract SupportsInterfaceWithLookupMock is IERC165 {

  bytes4 public constant InterfaceId_ERC165 = 0x01ffc9a7;
  /**
   * 0x01ffc9a7 ===
   *   bytes4(keccak256('supportsInterface(bytes4)'))
   */

  /**
   * @dev a mapping of interface id to whether or not it's supported
   */
  mapping(bytes4 => bool) private _supportedInterfaces;

  /**
   * @dev A contract implementing SupportsInterfaceWithLookup
   * implement ERC165 itself
   */
  constructor()
    public
  {
    _registerInterface(InterfaceId_ERC165);
  }

  /**
   * @dev implement supportsInterface(bytes4) using a lookup table
   */
  function supportsInterface(bytes4 interfaceId)
    external
    view
    returns (bool)
  {
    return _supportedInterfaces[interfaceId];
  }

  /**
   * @dev private method for registering an interface
   */
  function _registerInterface(bytes4 interfaceId)
    internal
  {
    require(interfaceId != 0xffffffff);
    _supportedInterfaces[interfaceId] = true;
  }
}

contract ERC165InterfacesSupported is SupportsInterfaceWithLookupMock {
  constructor (bytes4[] interfaceIds)
    public
  {
    for (uint256 i = 0; i < interfaceIds.length; i++) {
      _registerInterface(interfaceIds[i]);
    }
  }
}