dexorder

lib_openzeppelin_contracts/contracts/utils/Strings.sol

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+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.0.0) (utils/Strings.sol)
+
+pragma solidity ^0.8.20;
+
+import {Math} from "./math/Math.sol";
+import {SignedMath} from "./math/SignedMath.sol";
+
+/**
+ * @dev String operations.
+ */
+library Strings {
+    bytes16 private constant HEX_DIGITS = "0123456789abcdef";
+    uint8 private constant ADDRESS_LENGTH = 20;
+
+    /**
+     * @dev The `value` string doesn't fit in the specified `length`.
+     */
+    error StringsInsufficientHexLength(uint256 value, uint256 length);
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
+     */
+    function toString(uint256 value) internal pure returns (string memory) {
+        unchecked {
+            uint256 length = Math.log10(value) + 1;
+            string memory buffer = new string(length);
+            uint256 ptr;
+            /// @solidity memory-safe-assembly
+            assembly {
+                ptr := add(buffer, add(32, length))
+            }
+            while (true) {
+                ptr--;
+                /// @solidity memory-safe-assembly
+                assembly {
+                    mstore8(ptr, byte(mod(value, 10), HEX_DIGITS))
+                }
+                value /= 10;
+                if (value == 0) break;
+            }
+            return buffer;
+        }
+    }
+
+    /**
+     * @dev Converts a `int256` to its ASCII `string` decimal representation.
+     */
+    function toStringSigned(int256 value) internal pure returns (string memory) {
+        return string.concat(value < 0 ? "-" : "", toString(SignedMath.abs(value)));
+    }
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
+     */
+    function toHexString(uint256 value) internal pure returns (string memory) {
+        unchecked {
+            return toHexString(value, Math.log256(value) + 1);
+        }
+    }
+
+    /**
+     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
+     */
+    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
+        uint256 localValue = value;
+        bytes memory buffer = new bytes(2 * length + 2);
+        buffer[0] = "0";
+        buffer[1] = "x";
+        for (uint256 i = 2 * length + 1; i > 1; --i) {
+            buffer[i] = HEX_DIGITS[localValue & 0xf];
+            localValue >>= 4;
+        }
+        if (localValue != 0) {
+            revert StringsInsufficientHexLength(value, length);
+        }
+        return string(buffer);
+    }
+
+    /**
+     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal
+     * representation.
+     */
+    function toHexString(address addr) internal pure returns (string memory) {
+        return toHexString(uint256(uint160(addr)), ADDRESS_LENGTH);
+    }
+
+    /**
+     * @dev Returns true if the two strings are equal.
+     */
+    function equal(string memory a, string memory b) internal pure returns (bool) {
+        return bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b));
+    }
+}