{ "contractName": "ChainList", "abi": [], "metadata": 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"bytecode": "0x604c602c600b82828239805160001a60731460008114601c57601e565bfe5b5030600052607381538281f30073000000000000000000000000000000000000000030146080604052600080fd00a165627a7a72305820f82cbac49dbe027212f1999d62475398aec32aa4703bb417ef0df66421216b650029", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fd00a165627a7a72305820f82cbac49dbe027212f1999d62475398aec32aa4703bb417ef0df66421216b650029", "sourceMap": "91:3335:14:-;;132:2:-1;166:7;155:9;146:7;137:37;252:7;246:14;243:1;238:23;232:4;229:33;270:1;265:20;;;;222:63;;265:20;274:9;222:63;;298:9;295:1;288:20;328:4;319:7;311:22;352:7;343;336:24", "deployedSourceMap": "91:3335:14:-;;;;;;;;", "source": "pragma solidity >=0.4.24;\n\nimport \"../math/SafeMath.sol\";\n\n/**\n * @dev 区块链列表\n */\nlibrary ChainList {\n using SafeMath for uint256;\n\n // 遵循BIP44\n struct element {\n // 索引id\n uint256 idx;\n // chain id\n uint256 id;\n string symbol;\n }\n struct chainMap {\n // chain id => index\n mapping(uint256 => uint256) mapId;\n // symbol hash => index\n mapping(bytes32 => uint256) mapSymbol;\n // data array\n element[] list;\n }\n\n function exist(chainMap storage self, uint256 _id)\n internal\n view\n returns (bool)\n {\n if (self.list.length == 0) return false;\n return (self.list[self.mapId[_id]].id == _id &&\n getStringLen(self.list[self.mapId[_id]].symbol) > 0);\n }\n\n function getStringLen(string _str) internal pure returns (uint256) {\n bytes memory b = bytes(_str);\n require(b.length <= 1024, \"too large string make overflow risk\");\n return b.length;\n }\n\n function getHash(string _symbol) internal pure returns (bytes32) {\n return keccak256(abi.encodePacked(_symbol));\n }\n\n /**\n @dev 增加新定时定义，重复的ID返回失败\n */\n function insert(\n chainMap storage self,\n uint256 _id,\n string _symbol\n ) internal returns (bool) {\n if (exist(self, _id)) {\n return false;\n }\n\n element memory e =\n element({idx: self.list.length, id: _id, symbol: _symbol});\n\n self.list.push(e);\n self.mapId[_id] = e.idx;\n self.mapSymbol[getHash(_symbol)] = e.idx;\n\n return true;\n }\n\n function remove(chainMap storage self, uint256 _id) internal returns (bool) {\n if (!exist(self, _id)) {\n return false;\n }\n\n uint256 row2Del = self.mapId[_id];\n element storage keyToMove = self.list[self.list.length.sub(1)];\n self.list[row2Del] = keyToMove;\n self.mapId[keyToMove.id] = row2Del;\n self.mapSymbol[getHash(keyToMove.symbol)] = row2Del;\n self.list.length = self.list.length.sub(1);\n\n return true;\n }\n\n function count(chainMap storage self) internal view returns (uint256) {\n return self.list.length;\n }\n\n function get(chainMap storage self, uint256 index)\n internal\n view\n returns (ChainList.element)\n {\n require(index < self.list.length, \"index must small than current count\");\n return self.list[index];\n }\n\n function getById(chainMap storage self, uint256 _id)\n internal\n view\n returns (ChainList.element)\n {\n require(exist(self, _id), \"chain data must exist\");\n return self.list[self.mapId[_id]];\n }\n\n function getBySymbol(chainMap storage self, string _symbol)\n internal\n view\n returns (ChainList.element)\n {\n ChainList.element storage e = self.list[self.mapSymbol[getHash(_symbol)]];\n // 因为删除增加操作，map对应的存储未动，要校验一次\n require(exist(self, e.id), \"chain data must exist\");\n return e;\n }\n\n /**\n @dev 从指定位置返回多条（不多于count）地址记录,如果不足则空缺\n */\n function getList(\n chainMap storage self,\n uint256 from,\n uint256 _count\n ) internal view returns (ChainList.element[] memory) {\n uint256 _idx = 0;\n require(_count > 0, \"return number must bigger than 0\");\n ChainList.element[] memory res = new ChainList.element[](_count);\n\n for (uint256 i = from; i < self.list.length; i++) {\n if (_idx == _count) {\n break;\n }\n\n res[_idx] = self.list[i];\n _idx = _idx.add(1);\n }\n\n return res;\n }\n}\n", "sourcePath": "/Users/chtian/Documents/01_work/01_develope/jcc/jcc-solidity-utils/contracts/list/ChainList.sol", "ast": { 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