NoBey/openzeppelin-contracts
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Add non-value types in EnumerableSet and EnumerableMap (#5658)

Browse Source 
Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>
This commit is contained in:
Ernesto García
2025-06-03 08:26:06 -06:00
committed by GitHub
parent 4bafedfe72
commit 784d4f71b1
13 changed files with 770 additions and 101 deletions
Download Patch File Download Diff File Expand all files Collapse all files

249
contracts/utils/structs/EnumerableSet.sol
View File

@ -28,8 +28,13 @@ import {Arrays} from "../Arrays.sol";
* }
* ```
*
* As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
* and `uint256` (`UintSet`) are supported.
* The following types are supported:
*
* - `bytes32` (`Bytes32Set`) since v3.3.0
* - `address` (`AddressSet`) since v3.3.0
* - `uint256` (`UintSet`) since v3.3.0
* - `string` (`StringSet`) since v5.4.0
* - `bytes` (`BytesSet`) since v5.4.0
*
* [WARNING]
* ====
@ -419,4 +424,244 @@ library EnumerableSet {
return result;
}
struct StringSet {
// Storage of set values
string[] _values;
// Position is the index of the value in the `values` array plus 1.
// Position 0 is used to mean a value is not in the set.
mapping(string value => uint256) _positions;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(StringSet storage self, string memory value) internal returns (bool) {
if (!contains(self, value)) {
self._values.push(value);
// The value is stored at length-1, but we add 1 to all indexes
// and use 0 as a sentinel value
self._positions[value] = self._values.length;
return true;
} else {
return false;
}
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(StringSet storage self, string memory value) internal returns (bool) {
// We cache the value's position to prevent multiple reads from the same storage slot
uint256 position = self._positions[value];
if (position != 0) {
// Equivalent to contains(self, value)
// To delete an element from the _values array in O(1), we swap the element to delete with the last one in
// the array, and then remove the last element (sometimes called as 'swap and pop').
// This modifies the order of the array, as noted in {at}.
uint256 valueIndex = position - 1;
uint256 lastIndex = self._values.length - 1;
if (valueIndex != lastIndex) {
string memory lastValue = self._values[lastIndex];
// Move the lastValue to the index where the value to delete is
self._values[valueIndex] = lastValue;
// Update the tracked position of the lastValue (that was just moved)
self._positions[lastValue] = position;
}
// Delete the slot where the moved value was stored
self._values.pop();
// Delete the tracked position for the deleted slot
delete self._positions[value];
return true;
} else {
return false;
}
}
/**
* @dev Removes all the values from a set. O(n).
*
* WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
* function uncallable if the set grows to the point where clearing it consumes too much gas to fit in a block.
*/
function clear(StringSet storage set) internal {
uint256 len = length(set);
for (uint256 i = 0; i < len; ++i) {
delete set._positions[set._values[i]];
}
Arrays.unsafeSetLength(set._values, 0);
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(StringSet storage self, string memory value) internal view returns (bool) {
return self._positions[value] != 0;
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function length(StringSet storage self) internal view returns (uint256) {
return self._values.length;
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(StringSet storage self, uint256 index) internal view returns (string memory) {
return self._values[index];
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(StringSet storage self) internal view returns (string[] memory) {
return self._values;
}
struct BytesSet {
// Storage of set values
bytes[] _values;
// Position is the index of the value in the `values` array plus 1.
// Position 0 is used to mean a value is not in the set.
mapping(bytes value => uint256) _positions;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(BytesSet storage self, bytes memory value) internal returns (bool) {
if (!contains(self, value)) {
self._values.push(value);
// The value is stored at length-1, but we add 1 to all indexes
// and use 0 as a sentinel value
self._positions[value] = self._values.length;
return true;
} else {
return false;
}
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(BytesSet storage self, bytes memory value) internal returns (bool) {
// We cache the value's position to prevent multiple reads from the same storage slot
uint256 position = self._positions[value];
if (position != 0) {
// Equivalent to contains(self, value)
// To delete an element from the _values array in O(1), we swap the element to delete with the last one in
// the array, and then remove the last element (sometimes called as 'swap and pop').
// This modifies the order of the array, as noted in {at}.
uint256 valueIndex = position - 1;
uint256 lastIndex = self._values.length - 1;
if (valueIndex != lastIndex) {
bytes memory lastValue = self._values[lastIndex];
// Move the lastValue to the index where the value to delete is
self._values[valueIndex] = lastValue;
// Update the tracked position of the lastValue (that was just moved)
self._positions[lastValue] = position;
}
// Delete the slot where the moved value was stored
self._values.pop();
// Delete the tracked position for the deleted slot
delete self._positions[value];
return true;
} else {
return false;
}
}
/**
* @dev Removes all the values from a set. O(n).
*
* WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
* function uncallable if the set grows to the point where clearing it consumes too much gas to fit in a block.
*/
function clear(BytesSet storage set) internal {
uint256 len = length(set);
for (uint256 i = 0; i < len; ++i) {
delete set._positions[set._values[i]];
}
Arrays.unsafeSetLength(set._values, 0);
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(BytesSet storage self, bytes memory value) internal view returns (bool) {
return self._positions[value] != 0;
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function length(BytesSet storage self) internal view returns (uint256) {
return self._values.length;
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(BytesSet storage self, uint256 index) internal view returns (bytes memory) {
return self._values[index];
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(BytesSet storage self) internal view returns (bytes[] memory) {
return self._values;
}
}