{ "fileName": "EnumerableMap.sol", "contractName": "EnumerableMap", "source": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Library for managing an enumerable variant of Solidity's\n * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]\n * type.\n *\n * Maps have the following properties:\n *\n * - Entries are added, removed, and checked for existence in constant time\n * (O(1)).\n * - Entries are enumerated in O(n). No guarantees are made on the ordering.\n *\n * ```\n * contract Example {\n * // Add the library methods\n * using EnumerableMap for EnumerableMap.UintToAddressMap;\n *\n * // Declare a set state variable\n * EnumerableMap.UintToAddressMap private myMap;\n * }\n * ```\n *\n * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are\n * supported.\n */\nlibrary EnumerableMap {\n // To implement this library for multiple types with as little code\n // repetition as possible, we write it in terms of a generic Map type with\n // bytes32 keys and values.\n // The Map implementation uses private functions, and user-facing\n // implementations (such as Uint256ToAddressMap) are just wrappers around\n // the underlying Map.\n // This means that we can only create new EnumerableMaps for types that fit\n // in bytes32.\n\n struct MapEntry {\n bytes32 _key;\n bytes32 _value;\n }\n\n struct Map {\n // Storage of map keys and values\n MapEntry[] _entries;\n\n // Position of the entry defined by a key in the `entries` array, plus 1\n // because index 0 means a key is not in the map.\n mapping (bytes32 => uint256) _indexes;\n }\n\n /**\n * @dev Adds a key-value pair to a map, or updates the value for an existing\n * key. O(1).\n *\n * Returns true if the key was added to the map, that is if it was not\n * already present.\n */\n function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {\n // We read and store the key's index to prevent multiple reads from the same storage slot\n uint256 keyIndex = map._indexes[key];\n\n if (keyIndex == 0) { // Equivalent to !contains(map, key)\n map._entries.push(MapEntry({ _key: key, _value: value }));\n // The entry is stored at length-1, but we add 1 to all indexes\n // and use 0 as a sentinel value\n map._indexes[key] = map._entries.length;\n return true;\n } else {\n map._entries[keyIndex - 1]._value = value;\n return false;\n }\n }\n\n /**\n * @dev Removes a key-value pair from a map. O(1).\n *\n * Returns true if the key was removed from the map, that is if it was present.\n */\n function _remove(Map storage map, bytes32 key) private returns (bool) {\n // We read and store the key's index to prevent multiple reads from the same storage slot\n uint256 keyIndex = map._indexes[key];\n\n if (keyIndex != 0) { // Equivalent to contains(map, key)\n // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one\n // in the array, and then remove the last entry (sometimes called as 'swap and pop').\n // This modifies the order of the array, as noted in {at}.\n\n uint256 toDeleteIndex = keyIndex - 1;\n uint256 lastIndex = map._entries.length - 1;\n\n // When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs\n // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.\n\n MapEntry storage lastEntry = map._entries[lastIndex];\n\n // Move the last entry to the index where the entry to delete is\n map._entries[toDeleteIndex] = lastEntry;\n // Update the index for the moved entry\n map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based\n\n // Delete the slot where the moved entry was stored\n map._entries.pop();\n\n // Delete the index for the deleted slot\n delete map._indexes[key];\n\n return true;\n } else {\n return false;\n }\n }\n\n /**\n * @dev Returns true if the key is in the map. O(1).\n */\n function _contains(Map storage map, bytes32 key) private view returns (bool) {\n return map._indexes[key] != 0;\n }\n\n /**\n * @dev Returns the number of key-value pairs in the map. O(1).\n */\n function _length(Map storage map) private view returns (uint256) {\n return map._entries.length;\n }\n\n /**\n * @dev Returns the key-value pair stored at position `index` in the map. O(1).\n *\n * Note that there are no guarantees on the ordering of entries inside the\n * array, and it may change when more entries are added or removed.\n *\n * Requirements:\n *\n * - `index` must be strictly less than {length}.\n */\n function _at(Map storage map, uint256 index) private view returns (bytes32, bytes32) {\n require(map._entries.length > index, \"EnumerableMap: index out of bounds\");\n\n MapEntry storage entry = map._entries[index];\n return (entry._key, entry._value);\n }\n\n /**\n * @dev Returns the value associated with `key`. O(1).\n *\n * Requirements:\n *\n * - `key` must be in the map.\n */\n function _get(Map storage map, bytes32 key) private view returns (bytes32) {\n return _get(map, key, \"EnumerableMap: nonexistent key\");\n }\n\n /**\n * @dev Same as {_get}, with a custom error message when `key` is not in the map.\n */\n function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {\n uint256 keyIndex = map._indexes[key];\n require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)\n return map._entries[keyIndex - 1]._value; // All indexes are 1-based\n }\n\n // UintToAddressMap\n\n struct UintToAddressMap {\n Map _inner;\n }\n\n /**\n * @dev Adds a key-value pair to a map, or updates the value for an existing\n * key. O(1).\n *\n * Returns true if the key was added to the map, that is if it was not\n * already present.\n */\n function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {\n return _set(map._inner, bytes32(key), bytes32(uint256(value)));\n }\n\n /**\n * @dev Removes a value from a set. O(1).\n *\n * Returns true if the key was removed from the map, that is if it was present.\n */\n function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {\n return _remove(map._inner, bytes32(key));\n }\n\n /**\n * @dev Returns true if the key is in the map. O(1).\n */\n function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {\n return _contains(map._inner, bytes32(key));\n }\n\n /**\n * @dev Returns the number of elements in the map. O(1).\n */\n function length(UintToAddressMap storage map) internal view returns (uint256) {\n return _length(map._inner);\n }\n\n /**\n * @dev Returns the element stored at position `index` in the set. O(1).\n * Note that there are no guarantees on the ordering of values inside the\n * array, and it may change when more values are added or removed.\n *\n * Requirements:\n *\n * - `index` must be strictly less than {length}.\n */\n function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {\n (bytes32 key, bytes32 value) = _at(map._inner, index);\n return (uint256(key), address(uint256(value)));\n }\n\n /**\n * @dev Returns the value associated with `key`. O(1).\n *\n * Requirements:\n *\n * - `key` must be in the map.\n */\n function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {\n return address(uint256(_get(map._inner, bytes32(key))));\n }\n\n /**\n * @dev Same as {get}, with a custom error message when `key` is not in the map.\n */\n function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {\n return address(uint256(_get(map._inner, bytes32(key), errorMessage)));\n }\n}\n", "sourcePath": "contracts/utils/EnumerableMap.sol", "sourceMap": "764:7555:108:-:0;;;;;;;;;;;;;;;;;;;;;;;;;", "deployedSourceMap": "764:7555:108:-:0;;;;;;;;", "abi": [], "ast": { "absolutePath": "contracts/utils/EnumerableMap.sol", "exportedSymbols": { "EnumerableMap": [ 13509 ] }, "id": 13510, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 13056, "literals": [ "solidity", "^", "0.7", ".0" ], "nodeType": "PragmaDirective", "src": "33:23:108" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": { "id": 13057, "nodeType": "StructuredDocumentation", "src": "58:705:108", "text": " @dev Library for managing an enumerable variant of Solidity's\n https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]\n type.\n Maps have the following properties:\n - Entries are added, removed, and checked for existence in constant time\n (O(1)).\n - Entries are enumerated in O(n). No guarantees are made on the ordering.\n ```\n contract Example {\n // Add the library methods\n using EnumerableMap for EnumerableMap.UintToAddressMap;\n // Declare a set state variable\n EnumerableMap.UintToAddressMap private myMap;\n }\n ```\n As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are\n supported." }, "fullyImplemented": true, "id": 13509, "linearizedBaseContracts": [ 13509 ], "name": "EnumerableMap", "nodeType": "ContractDefinition", "nodes": [ { "canonicalName": "EnumerableMap.MapEntry", "id": 13062, "members": [ { "constant": false, "id": 13059, "mutability": "mutable", "name": "_key", "nodeType": "VariableDeclaration", "overrides": null, "scope": 13062, "src": "1276:12:108", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 13058, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "1276:7:108", "typeDescriptions": { 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"stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_array$_t_struct$_MapEntry_$13062_storage_$dyn_storage_ptr", "typeString": "struct EnumerableMap.MapEntry[]" }, "typeName": { "baseType": { "contractScope": null, "id": 13063, "name": "MapEntry", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 13062, "src": "1388:8:108", "typeDescriptions": { "typeIdentifier": "t_struct$_MapEntry_$13062_storage_ptr", "typeString": "struct EnumerableMap.MapEntry" } }, "id": 13064, "length": null, "nodeType": "ArrayTypeName", "src": "1388:10:108", "typeDescriptions": { "typeIdentifier": "t_array$_t_struct$_MapEntry_$13062_storage_$dyn_storage_ptr", "typeString": "struct EnumerableMap.MapEntry[]" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 13069, "mutability": "mutable", "name": "_indexes", "nodeType": "VariableDeclaration", "overrides": null, "scope": 13070, "src": "1557:37:108", "stateVariable": false, 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