Solidity String转换工具

Solidity String转换工具

相对openzeppelin，弥补一下没有的：bytes，address，uint转string

pragma solidity ^0.8.0;

contract String{
    //==============================string工具函数==============================
    function strConcat(string memory _a, string memory _b) internal returns (string memory){
        bytes memory _ba = bytes(_a);
        bytes memory _bb = bytes(_b);
        string memory ret = new string(_ba.length + _bb.length);
        bytes memory bret = bytes(ret);
        uint k = 0;
        for (uint i = 0; i < _ba.length; i++) bret[k++] = _ba[i];
        for (uint i = 0; i < _bb.length; i++) bret[k++] = _bb[i];
        return string(ret);
    }

    function toString(address account) public pure returns (string memory) {
        return toString(abi.encodePacked(account));
    }

    function toString(uint256 value) public pure returns (string memory) {
        return toString(abi.encodePacked(value));
    }

    function toString(bytes32 value) public pure returns (string memory) {
        return toString(abi.encodePacked(value));
    }

    function toString(bytes memory data) public pure returns (string memory) {
        bytes memory alphabet = "0123456789abcdef";

        bytes memory str = new bytes(2 + data.length * 2);
        str[0] = "0";
        str[1] = "x";
        for (uint i = 0; i < data.length; i++) {
            str[2 + i * 2] = alphabet[uint(uint8(data[i] >> 4))];
            str[3 + i * 2] = alphabet[uint(uint8(data[i] & 0x0f))];
        }
        return string(str);
    }
}