{
  "contractName": "strings",
  "abi": [],
  "bytecode": "0x604c602c600b82828239805160001a60731460008114601c57601e565bfe5b5030600052607381538281f30073000000000000000000000000000000000000000030146080604052600080fd00a165627a7a72305820dd3ae9d75ff3fa73361a02b01e9b6f2351e7da198756a7276b3c729775fa90810029",
  "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fd00a165627a7a72305820dd3ae9d75ff3fa73361a02b01e9b6f2351e7da198756a7276b3c729775fa90810029",
  "sourceMap": "2003:23357:13:-;;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": "2003:23357:13:-;;;;;;;;",
  "source": "/*\n * @title String & slice utility library for Solidity contracts.\n * @author Nick Johnson <arachnid@notdot.net>\n *\n * @dev Functionality in this library is largely implemented using an\n *      abstraction called a 'slice'. A slice represents a part of a string -\n *      anything from the entire string to a single character, or even no\n *      characters at all (a 0-length slice). Since a slice only has to specify\n *      an offset and a length, copying and manipulating slices is a lot less\n *      expensive than copying and manipulating the strings they reference.\n *\n *      To further reduce gas costs, most functions on slice that need to return\n *      a slice modify the original one instead of allocating a new one; for\n *      instance, `s.split(\".\")` will return the text up to the first '.',\n *      modifying s to only contain the remainder of the string after the '.'.\n *      In situations where you do not want to modify the original slice, you\n *      can make a copy first with `.copy()`, for example:\n *      `s.copy().split(\".\")`. Try and avoid using this idiom in loops; since\n *      Solidity has no memory management, it will result in allocating many\n *      short-lived slices that are later discarded.\n *\n *      Functions that return two slices come in two versions: a non-allocating\n *      version that takes the second slice as an argument, modifying it in\n *      place, and an allocating version that allocates and returns the second\n *      slice; see `nextRune` for example.\n *\n *      Functions that have to copy string data will return strings rather than\n *      slices; these can be cast back to slices for further processing if\n *      required.\n *\n *      For convenience, some functions are provided with non-modifying\n *      variants that create a new slice and return both; for instance,\n *      `s.splitNew('.')` leaves s unmodified, and returns two values\n *      corresponding to the left and right parts of the string.\n */\n\npragma solidity ^0.4.14;\n\nlibrary strings {\n    struct slice {\n        uint _len;\n        uint _ptr;\n    }\n\n    function memcpy(uint dest, uint src, uint len) private pure {\n        // Copy word-length chunks while possible\n        for(; len >= 32; len -= 32) {\n            assembly {\n                mstore(dest, mload(src))\n            }\n            dest += 32;\n            src += 32;\n        }\n\n        // Copy remaining bytes\n        uint mask = 256 ** (32 - len) - 1;\n        assembly {\n            let srcpart := and(mload(src), not(mask))\n            let destpart := and(mload(dest), mask)\n            mstore(dest, or(destpart, srcpart))\n        }\n    }\n\n    /*\n     * @dev Returns a slice containing the entire string.\n     * @param self The string to make a slice from.\n     * @return A newly allocated slice containing the entire string.\n     */\n    function toSlice(string memory self) internal pure returns (slice memory) {\n        uint ptr;\n        assembly {\n            ptr := add(self, 0x20)\n        }\n        return slice(bytes(self).length, ptr);\n    }\n\n    /*\n     * @dev Returns the length of a null-terminated bytes32 string.\n     * @param self The value to find the length of.\n     * @return The length of the string, from 0 to 32.\n     */\n    function len(bytes32 self) internal pure returns (uint) {\n        uint ret;\n        if (self == 0)\n            return 0;\n        if (self & 0xffffffffffffffffffffffffffffffff == 0) {\n            ret += 16;\n            self = bytes32(uint(self) / 0x100000000000000000000000000000000);\n        }\n        if (self & 0xffffffffffffffff == 0) {\n            ret += 8;\n            self = bytes32(uint(self) / 0x10000000000000000);\n        }\n        if (self & 0xffffffff == 0) {\n            ret += 4;\n            self = bytes32(uint(self) / 0x100000000);\n        }\n        if (self & 0xffff == 0) {\n            ret += 2;\n            self = bytes32(uint(self) / 0x10000);\n        }\n        if (self & 0xff == 0) {\n            ret += 1;\n        }\n        return 32 - ret;\n    }\n\n    /*\n     * @dev Returns a slice containing the entire bytes32, interpreted as a\n     *      null-terminated utf-8 string.\n     * @param self The bytes32 value to convert to a slice.\n     * @return A new slice containing the value of the input argument up to the\n     *         first null.\n     */\n    function toSliceB32(bytes32 self) internal pure returns (slice memory ret) {\n        // Allocate space for `self` in memory, copy it there, and point ret at it\n        assembly {\n            let ptr := mload(0x40)\n            mstore(0x40, add(ptr, 0x20))\n            mstore(ptr, self)\n            mstore(add(ret, 0x20), ptr)\n        }\n        ret._len = len(self);\n    }\n\n    /*\n     * @dev Returns a new slice containing the same data as the current slice.\n     * @param self The slice to copy.\n     * @return A new slice containing the same data as `self`.\n     */\n    function copy(slice memory self) internal pure returns (slice memory) {\n        return slice(self._len, self._ptr);\n    }\n\n    /*\n     * @dev Copies a slice to a new string.\n     * @param self The slice to copy.\n     * @return A newly allocated string containing the slice's text.\n     */\n    function toString(slice memory self) internal pure returns (string memory) {\n        string memory ret = new string(self._len);\n        uint retptr;\n        assembly { retptr := add(ret, 32) }\n\n        memcpy(retptr, self._ptr, self._len);\n        return ret;\n    }\n\n    /*\n     * @dev Returns the length in runes of the slice. Note that this operation\n     *      takes time proportional to the length of the slice; avoid using it\n     *      in loops, and call `slice.empty()` if you only need to know whether\n     *      the slice is empty or not.\n     * @param self The slice to operate on.\n     * @return The length of the slice in runes.\n     */\n    function len(slice memory self) internal pure returns (uint l) {\n        // Starting at ptr-31 means the LSB will be the byte we care about\n        uint ptr = self._ptr - 31;\n        uint end = ptr + self._len;\n        for (l = 0; ptr < end; l++) {\n            uint8 b;\n            assembly { b := and(mload(ptr), 0xFF) }\n            if (b < 0x80) {\n                ptr += 1;\n            } else if(b < 0xE0) {\n                ptr += 2;\n            } else if(b < 0xF0) {\n                ptr += 3;\n            } else if(b < 0xF8) {\n                ptr += 4;\n            } else if(b < 0xFC) {\n                ptr += 5;\n            } else {\n                ptr += 6;\n            }\n        }\n    }\n\n    /*\n     * @dev Returns true if the slice is empty (has a length of 0).\n     * @param self The slice to operate on.\n     * @return True if the slice is empty, False otherwise.\n     */\n    function empty(slice memory self) internal pure returns (bool) {\n        return self._len == 0;\n    }\n\n    /*\n     * @dev Returns a positive number if `other` comes lexicographically after\n     *      `self`, a negative number if it comes before, or zero if the\n     *      contents of the two slices are equal. Comparison is done per-rune,\n     *      on unicode codepoints.\n     * @param self The first slice to compare.\n     * @param other The second slice to compare.\n     * @return The result of the comparison.\n     */\n    function compare(slice memory self, slice memory other) internal pure returns (int) {\n        uint shortest = self._len;\n        if (other._len < self._len)\n            shortest = other._len;\n\n        uint selfptr = self._ptr;\n        uint otherptr = other._ptr;\n        for (uint idx = 0; idx < shortest; idx += 32) {\n            uint a;\n            uint b;\n            assembly {\n                a := mload(selfptr)\n                b := mload(otherptr)\n            }\n            if (a != b) {\n                // Mask out irrelevant bytes and check again\n                uint256 mask = uint256(-1); // 0xffff...\n                if(shortest < 32) {\n                    mask = ~(2 ** (8 * (32 - shortest + idx)) - 1);\n                }\n                uint256 diff = (a & mask) - (b & mask);\n                if (diff != 0)\n                    return int(diff);\n            }\n            selfptr += 32;\n            otherptr += 32;\n        }\n        return int(self._len) - int(other._len);\n    }\n\n    /*\n     * @dev Returns true if the two slices contain the same text.\n     * @param self The first slice to compare.\n     * @param self The second slice to compare.\n     * @return True if the slices are equal, false otherwise.\n     */\n    function equals(slice memory self, slice memory other) internal pure returns (bool) {\n        return compare(self, other) == 0;\n    }\n\n    /*\n     * @dev Extracts the first rune in the slice into `rune`, advancing the\n     *      slice to point to the next rune and returning `self`.\n     * @param self The slice to operate on.\n     * @param rune The slice that will contain the first rune.\n     * @return `rune`.\n     */\n    function nextRune(slice memory self, slice memory rune) internal pure returns (slice memory) {\n        rune._ptr = self._ptr;\n\n        if (self._len == 0) {\n            rune._len = 0;\n            return rune;\n        }\n\n        uint l;\n        uint b;\n        // Load the first byte of the rune into the LSBs of b\n        assembly { b := and(mload(sub(mload(add(self, 32)), 31)), 0xFF) }\n        if (b < 0x80) {\n            l = 1;\n        } else if(b < 0xE0) {\n            l = 2;\n        } else if(b < 0xF0) {\n            l = 3;\n        } else {\n            l = 4;\n        }\n\n        // Check for truncated codepoints\n        if (l > self._len) {\n            rune._len = self._len;\n            self._ptr += self._len;\n            self._len = 0;\n            return rune;\n        }\n\n        self._ptr += l;\n        self._len -= l;\n        rune._len = l;\n        return rune;\n    }\n\n    /*\n     * @dev Returns the first rune in the slice, advancing the slice to point\n     *      to the next rune.\n     * @param self The slice to operate on.\n     * @return A slice containing only the first rune from `self`.\n     */\n    function nextRune(slice memory self) internal pure returns (slice memory ret) {\n        nextRune(self, ret);\n    }\n\n    /*\n     * @dev Returns the number of the first codepoint in the slice.\n     * @param self The slice to operate on.\n     * @return The number of the first codepoint in the slice.\n     */\n    function ord(slice memory self) internal pure returns (uint ret) {\n        if (self._len == 0) {\n            return 0;\n        }\n\n        uint word;\n        uint length;\n        uint divisor = 2 ** 248;\n\n        // Load the rune into the MSBs of b\n        assembly { word:= mload(mload(add(self, 32))) }\n        uint b = word / divisor;\n        if (b < 0x80) {\n            ret = b;\n            length = 1;\n        } else if(b < 0xE0) {\n            ret = b & 0x1F;\n            length = 2;\n        } else if(b < 0xF0) {\n            ret = b & 0x0F;\n            length = 3;\n        } else {\n            ret = b & 0x07;\n            length = 4;\n        }\n\n        // Check for truncated codepoints\n        if (length > self._len) {\n            return 0;\n        }\n\n        for (uint i = 1; i < length; i++) {\n            divisor = divisor / 256;\n            b = (word / divisor) & 0xFF;\n            if (b & 0xC0 != 0x80) {\n                // Invalid UTF-8 sequence\n                return 0;\n            }\n            ret = (ret * 64) | (b & 0x3F);\n        }\n\n        return ret;\n    }\n\n    /*\n     * @dev Returns the keccak-256 hash of the slice.\n     * @param self The slice to hash.\n     * @return The hash of the slice.\n     */\n    function keccak(slice memory self) internal pure returns (bytes32 ret) {\n        assembly {\n            ret := keccak256(mload(add(self, 32)), mload(self))\n        }\n    }\n\n    /*\n     * @dev Returns true if `self` starts with `needle`.\n     * @param self The slice to operate on.\n     * @param needle The slice to search for.\n     * @return True if the slice starts with the provided text, false otherwise.\n     */\n    function startsWith(slice memory self, slice memory needle) internal pure returns (bool) {\n        if (self._len < needle._len) {\n            return false;\n        }\n\n        if (self._ptr == needle._ptr) {\n            return true;\n        }\n\n        bool equal;\n        assembly {\n            let length := mload(needle)\n            let selfptr := mload(add(self, 0x20))\n            let needleptr := mload(add(needle, 0x20))\n            equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))\n        }\n        return equal;\n    }\n\n    /*\n     * @dev If `self` starts with `needle`, `needle` is removed from the\n     *      beginning of `self`. Otherwise, `self` is unmodified.\n     * @param self The slice to operate on.\n     * @param needle The slice to search for.\n     * @return `self`\n     */\n    function beyond(slice memory self, slice memory needle) internal pure returns (slice memory) {\n        if (self._len < needle._len) {\n            return self;\n        }\n\n        bool equal = true;\n        if (self._ptr != needle._ptr) {\n            assembly {\n                let length := mload(needle)\n                let selfptr := mload(add(self, 0x20))\n                let needleptr := mload(add(needle, 0x20))\n                equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))\n            }\n        }\n\n        if (equal) {\n            self._len -= needle._len;\n            self._ptr += needle._len;\n        }\n\n        return self;\n    }\n\n    /*\n     * @dev Returns true if the slice ends with `needle`.\n     * @param self The slice to operate on.\n     * @param needle The slice to search for.\n     * @return True if the slice starts with the provided text, false otherwise.\n     */\n    function endsWith(slice memory self, slice memory needle) internal pure returns (bool) {\n        if (self._len < needle._len) {\n            return false;\n        }\n\n        uint selfptr = self._ptr + self._len - needle._len;\n\n        if (selfptr == needle._ptr) {\n            return true;\n        }\n\n        bool equal;\n        assembly {\n            let length := mload(needle)\n            let needleptr := mload(add(needle, 0x20))\n            equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))\n        }\n\n        return equal;\n    }\n\n    /*\n     * @dev If `self` ends with `needle`, `needle` is removed from the\n     *      end of `self`. Otherwise, `self` is unmodified.\n     * @param self The slice to operate on.\n     * @param needle The slice to search for.\n     * @return `self`\n     */\n    function until(slice memory self, slice memory needle) internal pure returns (slice memory) {\n        if (self._len < needle._len) {\n            return self;\n        }\n\n        uint selfptr = self._ptr + self._len - needle._len;\n        bool equal = true;\n        if (selfptr != needle._ptr) {\n            assembly {\n                let length := mload(needle)\n                let needleptr := mload(add(needle, 0x20))\n                equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))\n            }\n        }\n\n        if (equal) {\n            self._len -= needle._len;\n        }\n\n        return self;\n    }\n\n    // Returns the memory address of the first byte of the first occurrence of\n    // `needle` in `self`, or the first byte after `self` if not found.\n    function findPtr(uint selflen, uint selfptr, uint needlelen, uint needleptr) private pure returns (uint) {\n        uint ptr = selfptr;\n        uint idx;\n\n        if (needlelen <= selflen) {\n            if (needlelen <= 32) {\n                bytes32 mask = bytes32(~(2 ** (8 * (32 - needlelen)) - 1));\n\n                bytes32 needledata;\n                assembly { needledata := and(mload(needleptr), mask) }\n\n                uint end = selfptr + selflen - needlelen;\n                bytes32 ptrdata;\n                assembly { ptrdata := and(mload(ptr), mask) }\n\n                while (ptrdata != needledata) {\n                    if (ptr >= end)\n                        return selfptr + selflen;\n                    ptr++;\n                    assembly { ptrdata := and(mload(ptr), mask) }\n                }\n                return ptr;\n            } else {\n                // For long needles, use hashing\n                bytes32 hash;\n                assembly { hash := keccak256(needleptr, needlelen) }\n\n                for (idx = 0; idx <= selflen - needlelen; idx++) {\n                    bytes32 testHash;\n                    assembly { testHash := keccak256(ptr, needlelen) }\n                    if (hash == testHash)\n                        return ptr;\n                    ptr += 1;\n                }\n            }\n        }\n        return selfptr + selflen;\n    }\n\n    // Returns the memory address of the first byte after the last occurrence of\n    // `needle` in `self`, or the address of `self` if not found.\n    function rfindPtr(uint selflen, uint selfptr, uint needlelen, uint needleptr) private pure returns (uint) {\n        uint ptr;\n\n        if (needlelen <= selflen) {\n            if (needlelen <= 32) {\n                bytes32 mask = bytes32(~(2 ** (8 * (32 - needlelen)) - 1));\n\n                bytes32 needledata;\n                assembly { needledata := and(mload(needleptr), mask) }\n\n                ptr = selfptr + selflen - needlelen;\n                bytes32 ptrdata;\n                assembly { ptrdata := and(mload(ptr), mask) }\n\n                while (ptrdata != needledata) {\n                    if (ptr <= selfptr)\n                        return selfptr;\n                    ptr--;\n                    assembly { ptrdata := and(mload(ptr), mask) }\n                }\n                return ptr + needlelen;\n            } else {\n                // For long needles, use hashing\n                bytes32 hash;\n                assembly { hash := keccak256(needleptr, needlelen) }\n                ptr = selfptr + (selflen - needlelen);\n                while (ptr >= selfptr) {\n                    bytes32 testHash;\n                    assembly { testHash := keccak256(ptr, needlelen) }\n                    if (hash == testHash)\n                        return ptr + needlelen;\n                    ptr -= 1;\n                }\n            }\n        }\n        return selfptr;\n    }\n\n    /*\n     * @dev Modifies `self` to contain everything from the first occurrence of\n     *      `needle` to the end of the slice. `self` is set to the empty slice\n     *      if `needle` is not found.\n     * @param self The slice to search and modify.\n     * @param needle The text to search for.\n     * @return `self`.\n     */\n    function find(slice memory self, slice memory needle) internal pure returns (slice memory) {\n        uint ptr = findPtr(self._len, self._ptr, needle._len, needle._ptr);\n        self._len -= ptr - self._ptr;\n        self._ptr = ptr;\n        return self;\n    }\n\n    /*\n     * @dev Modifies `self` to contain the part of the string from the start of\n     *      `self` to the end of the first occurrence of `needle`. If `needle`\n     *      is not found, `self` is set to the empty slice.\n     * @param self The slice to search and modify.\n     * @param needle The text to search for.\n     * @return `self`.\n     */\n    function rfind(slice memory self, slice memory needle) internal pure returns (slice memory) {\n        uint ptr = rfindPtr(self._len, self._ptr, needle._len, needle._ptr);\n        self._len = ptr - self._ptr;\n        return self;\n    }\n\n    /*\n     * @dev Splits the slice, setting `self` to everything after the first\n     *      occurrence of `needle`, and `token` to everything before it. If\n     *      `needle` does not occur in `self`, `self` is set to the empty slice,\n     *      and `token` is set to the entirety of `self`.\n     * @param self The slice to split.\n     * @param needle The text to search for in `self`.\n     * @param token An output parameter to which the first token is written.\n     * @return `token`.\n     */\n    function split(slice memory self, slice memory needle, slice memory token) internal pure returns (slice memory) {\n        uint ptr = findPtr(self._len, self._ptr, needle._len, needle._ptr);\n        token._ptr = self._ptr;\n        token._len = ptr - self._ptr;\n        if (ptr == self._ptr + self._len) {\n            // Not found\n            self._len = 0;\n        } else {\n            self._len -= token._len + needle._len;\n            self._ptr = ptr + needle._len;\n        }\n        return token;\n    }\n\n    /*\n     * @dev Splits the slice, setting `self` to everything after the first\n     *      occurrence of `needle`, and returning everything before it. If\n     *      `needle` does not occur in `self`, `self` is set to the empty slice,\n     *      and the entirety of `self` is returned.\n     * @param self The slice to split.\n     * @param needle The text to search for in `self`.\n     * @return The part of `self` up to the first occurrence of `delim`.\n     */\n    function split(slice memory self, slice memory needle) internal pure returns (slice memory token) {\n        split(self, needle, token);\n    }\n\n    /*\n     * @dev Splits the slice, setting `self` to everything before the last\n     *      occurrence of `needle`, and `token` to everything after it. If\n     *      `needle` does not occur in `self`, `self` is set to the empty slice,\n     *      and `token` is set to the entirety of `self`.\n     * @param self The slice to split.\n     * @param needle The text to search for in `self`.\n     * @param token An output parameter to which the first token is written.\n     * @return `token`.\n     */\n    function rsplit(slice memory self, slice memory needle, slice memory token) internal pure returns (slice memory) {\n        uint ptr = rfindPtr(self._len, self._ptr, needle._len, needle._ptr);\n        token._ptr = ptr;\n        token._len = self._len - (ptr - self._ptr);\n        if (ptr == self._ptr) {\n            // Not found\n            self._len = 0;\n        } else {\n            self._len -= token._len + needle._len;\n        }\n        return token;\n    }\n\n    /*\n     * @dev Splits the slice, setting `self` to everything before the last\n     *      occurrence of `needle`, and returning everything after it. If\n     *      `needle` does not occur in `self`, `self` is set to the empty slice,\n     *      and the entirety of `self` is returned.\n     * @param self The slice to split.\n     * @param needle The text to search for in `self`.\n     * @return The part of `self` after the last occurrence of `delim`.\n     */\n    function rsplit(slice memory self, slice memory needle) internal pure returns (slice memory token) {\n        rsplit(self, needle, token);\n    }\n\n    /*\n     * @dev Counts the number of nonoverlapping occurrences of `needle` in `self`.\n     * @param self The slice to search.\n     * @param needle The text to search for in `self`.\n     * @return The number of occurrences of `needle` found in `self`.\n     */\n    function count(slice memory self, slice memory needle) internal pure returns (uint cnt) {\n        uint ptr = findPtr(self._len, self._ptr, needle._len, needle._ptr) + needle._len;\n        while (ptr <= self._ptr + self._len) {\n            cnt++;\n            ptr = findPtr(self._len - (ptr - self._ptr), ptr, needle._len, needle._ptr) + needle._len;\n        }\n    }\n\n    /*\n     * @dev Returns True if `self` contains `needle`.\n     * @param self The slice to search.\n     * @param needle The text to search for in `self`.\n     * @return True if `needle` is found in `self`, false otherwise.\n     */\n    function contains(slice memory self, slice memory needle) internal pure returns (bool) {\n        return rfindPtr(self._len, self._ptr, needle._len, needle._ptr) != self._ptr;\n    }\n\n    /*\n     * @dev Returns a newly allocated string containing the concatenation of\n     *      `self` and `other`.\n     * @param self The first slice to concatenate.\n     * @param other The second slice to concatenate.\n     * @return The concatenation of the two strings.\n     */\n    function concat(slice memory self, slice memory other) internal pure returns (string memory) {\n        string memory ret = new string(self._len + other._len);\n        uint retptr;\n        assembly { retptr := add(ret, 32) }\n        memcpy(retptr, self._ptr, self._len);\n        memcpy(retptr + self._len, other._ptr, other._len);\n        return ret;\n    }\n\n    /*\n     * @dev Joins an array of slices, using `self` as a delimiter, returning a\n     *      newly allocated string.\n     * @param self The delimiter to use.\n     * @param parts A list of slices to join.\n     * @return A newly allocated string containing all the slices in `parts`,\n     *         joined with `self`.\n     */\n    function join(slice memory self, slice[] memory parts) internal pure returns (string memory) {\n        if (parts.length == 0)\n            return \"\";\n\n        uint length = self._len * (parts.length - 1);\n        for(uint i = 0; i < parts.length; i++)\n            length += parts[i]._len;\n\n        string memory ret = new string(length);\n        uint retptr;\n        assembly { retptr := add(ret, 32) }\n\n        for(i = 0; i < parts.length; i++) {\n            memcpy(retptr, parts[i]._ptr, parts[i]._len);\n            retptr += parts[i]._len;\n            if (i < parts.length - 1) {\n                memcpy(retptr, self._ptr, self._len);\n                retptr += self._len;\n            }\n        }\n\n        return ret;\n    }\n}",
  "sourcePath": "/Users/yoonjae/SolidityProjects/tokenboost-solidity/contracts/utils/strings.sol",
  "ast": {
    "absolutePath": "/Users/yoonjae/SolidityProjects/tokenboost-solidity/contracts/utils/strings.sol",
    "exportedSymbols": {
      "strings": [
        3728
      ]
    },
    "id": 3729,
    "nodeType": "SourceUnit",
    "nodes": [
      {
        "id": 2035,
        "literals": [
          "solidity",
          "^",
          "0.4",
          ".14"
        ],
        "nodeType": "PragmaDirective",
        "src": "1977:24:13"
      },
      {
        "baseContracts": [],
        "contractDependencies": [],
        "contractKind": "library",
        "documentation": null,
        "fullyImplemented": true,
        "id": 3728,
        "linearizedBaseContracts": [
          3728
        ],
        "name": "strings",
        "nodeType": "ContractDefinition",
        "nodes": [
          {
            "canonicalName": "strings.slice",
            "id": 2040,
            "members": [
              {
                "constant": false,
                "id": 2037,
                "name": "_len",
                "nodeType": "VariableDeclaration",
                "scope": 2040,
                "src": "2048:9:13",
                "stateVariable": false,
                "storageLocation": "default",
                "typeDescriptions": {
                  "typeIdentifier": "t_uint256",
                  "typeString": "uint256"
                },
                "typeName": {
                  "id": 2036,
                  "name": "uint",
                  "nodeType": "ElementaryTypeName",
                  "src": "2048:4:13",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
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