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13 KiB
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{"version":3,"sources":["../../src/utils/number.util.ts"],"sourcesContent":["import Web3 from 'web3'\nimport { BN } from 'ethereumjs-util'\n\n/**\n * Converts some token minimal unit to render format string, showing 5 decimals\n *\n * @param {Number|String|BN} tokenValue - Token value to convert\n * @param {Number} decimals - Token decimals to convert\n * @param {Number} decimalsToShow - Decimals to 5\n * @returns {String} - Number of token minimal unit, in render format\n * If value is less than 5 precision decimals will show '< 0.00001'\n */\nexport function renderFromTokenMinimalUnit(tokenValue, decimals, decimalsToShow = 5) {\n const minimalUnit = fromTokenMinimalUnit(tokenValue || 0, decimals)\n const minimalUnitNumber = parseFloat(minimalUnit)\n let renderMinimalUnit\n if (minimalUnitNumber < 0.00001 && minimalUnitNumber > 0) {\n renderMinimalUnit = '< 0.00001'\n } else {\n const base = Math.pow(10, decimalsToShow)\n renderMinimalUnit = (Math.round(minimalUnitNumber * base) / base).toString()\n }\n return renderMinimalUnit\n}\n/**\n * Converts token minimal unit to readable string value\n *\n * @param {number|string|Object} minimalInput - Token minimal unit to convert\n * @param {string} decimals - Token decimals to convert\n * @returns {string} - String containing the new number\n */\nexport function fromTokenMinimalUnit(minimalInput, decimals) {\n minimalInput = addHexPrefix(Number(minimalInput).toString(16))\n let minimal = safeNumberToBN(minimalInput)\n const negative = minimal.lt(new BN(0))\n const base = Web3.utils.toBN(Math.pow(10, decimals).toString())\n\n if (negative) {\n minimal = minimal.mul(new BN(-1))\n }\n let fraction = minimal.mod(base).toString(10)\n while (fraction.length < decimals) {\n fraction = '0' + fraction\n }\n fraction = fraction.match(/^([0-9]*[1-9]|0)(0*)/)[1]\n const whole = minimal.div(base).toString(10)\n let value = '' + whole + (fraction === '0' ? '' : '.' + fraction)\n if (negative) {\n value = '-' + value\n }\n return value\n}\n\n/**\n * Converts wei to render format string, showing 5 decimals\n *\n * @param {Number|String|BN} value - Wei to convert\n * @param {Number} decimalsToShow - Decimals to 5\n * @returns {String} - Number of token minimal unit, in render format\n * If value is less than 5 precision decimals will show '< 0.00001'\n */\nexport function renderFromWei(value, decimalsToShow = 5) {\n let renderWei = '0'\n // avoid undefined\n if (value) {\n const wei = Web3.utils.fromWei(value)\n const weiNumber = parseFloat(wei)\n if (weiNumber < 0.00001 && weiNumber > 0) {\n renderWei = '< 0.00001'\n } else {\n const base = Math.pow(10, decimalsToShow)\n renderWei = (Math.round(weiNumber * base) / base).toString()\n }\n }\n return renderWei\n}\n\n/**\n * Converts token BN value to hex string number to be sent\n *\n * @param {Object} value - BN instance to convert\n * @param {number} decimals - Decimals to be considered on the conversion\n * @returns {string} - String of the hex token value\n */\nexport function calcTokenValueToSend(value, decimals) {\n return value ? (value * Math.pow(10, decimals)).toString(16) : 0\n}\n\n/**\n * Determines if a string is a valid decimal\n *\n * @param {string} value - String to check\n * @returns {boolean} - True if the string is a valid decimal\n */\nexport function isDecimal(value) {\n return Number.isFinite(parseFloat(value)) && !Number.isNaN(parseFloat(value)) && !isNaN(+value)\n}\n\n/**\n * Creates a BN object from a string\n *\n * @param {string} value - Some numeric value represented as a string\n * @returns {Object} - BN instance\n */\nexport function toBN(value) {\n return Web3.utils.toBN(value)\n}\n\n/**\n * Prefixes a hex string with '0x' or '-0x' and returns it. Idempotent.\n *\n * @param {string} str - The string to prefix.\n * @returns {string} The prefixed string.\n */\nexport const addHexPrefix = (str: string) => {\n if (typeof str !== 'string' || str.match(/^-?0x/u)) {\n return str\n }\n\n if (str.match(/^-?0X/u)) {\n return str.replace('0X', '0x')\n }\n\n if (str.startsWith('-')) {\n return str.replace('-', '-0x')\n }\n\n return `0x${str}`\n}\n\n/**\n * Wraps 'numberToBN' method to avoid potential undefined and decimal values\n *\n * @param {number|string} value - number\n * @returns {Object} - The converted value as BN instance\n */\nexport function safeNumberToBN(value: number | string) {\n const safeValue = fastSplit(value.toString()) || '0'\n return numberToBN(safeValue)\n}\n\n/**\n * Performs a fast string split and returns the first item of the string based on the divider provided\n *\n * @param {number|string} value - number/string to be splitted\n * @param {string} divider - string value to use to split the string (default '.')\n * @returns {string} - the selected splitted element\n */\n\nexport function fastSplit(value, divider = '.') {\n value += ''\n const [from, to] = [value.indexOf(divider), 0]\n return value.substring(from, to) || value\n}\n\nexport function stripHexPrefix(str: string) {\n if (typeof str !== 'string') {\n return str\n }\n\n return str.slice(0, 2) === '0x' ? str.slice(2) : str\n}\n\nexport function numberToBN(arg) {\n if (typeof arg === 'string' || typeof arg === 'number') {\n var multiplier = Web3.utils.toBN(1); // eslint-disable-line\n var formattedString = String(arg).toLowerCase().trim()\n var isHexPrefixed = formattedString.substr(0, 2) === '0x' || formattedString.substr(0, 3) === '-0x'\n var stringArg = stripHexPrefix(formattedString); // eslint-disable-line\n if (stringArg.substr(0, 1) === '-') {\n stringArg = stripHexPrefix(stringArg.slice(1))\n multiplier = Web3.utils.toBN(-1)\n }\n stringArg = stringArg === '' ? '0' : stringArg\n\n if (\n (!stringArg.match(/^-?[0-9]+$/) && stringArg.match(/^[0-9A-Fa-f]+$/)) ||\n stringArg.match(/^[a-fA-F]+$/) ||\n (isHexPrefixed === true && stringArg.match(/^[0-9A-Fa-f]+$/))\n ) {\n return Web3.utils.toBN(stringArg).mul(multiplier)\n }\n\n if ((stringArg.match(/^-?[0-9]+$/) || stringArg === '') && isHexPrefixed === false) {\n return Web3.utils.toBN(stringArg).mul(multiplier)\n }\n } else if (typeof arg === 'object' && arg.toString && !arg.pop && !arg.push) {\n if (arg.toString(10).match(/^-?[0-9]+$/) && (arg.mul || arg.dividedToIntegerBy)) {\n return Web3.utils.toBN(arg.toString(10))\n }\n }\n\n throw new Error(\n '[number-to-bn] while converting number ' +\n JSON.stringify(arg) +\n ' to BN.js instance, error: invalid number value. Value must be an integer, hex string, BN or BigNumber instance. Note, decimals are not supported.',\n )\n}\n\nfunction checkRadixLegal(radix) {\n return radix >= 2 && radix <= 62\n}\n\n/**\n * 将letter转为纯数字\n * @param {string} letter\n * @returns {number}\n */\nfunction transformCharToNum(letter, base) {\n if (base <= 36) {\n letter = letter.toLowerCase()\n }\n if (letter >= '0' && letter <= '9') {\n return parseInt(letter)\n }\n if (letter >= 'a' && letter <= 'z') {\n return letter.charCodeAt(0) - 'a'.charCodeAt(0) + 10\n }\n if (letter >= 'A' && letter <= 'Z') {\n return letter.charCodeAt(0) - 'A'.charCodeAt(0) + 36\n }\n return 0\n}\n\n/**\n * 将数字转为进制里的字母\n * @param {number} num\n * @return {string}\n */\nfunction transformNumToChar(num, alphabet) {\n alphabet = alphabet || '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'\n return alphabet.charAt(num)\n}\n\n/**\n * Converts a number from the base specified by `base` to the base specified by `to`.\n * @param {string} numStr - The number string to be converted.\n * @param {number} base - The base of the number.\n * @param {number} to - The target base for the conversion.\n * @return {string} - The converted number string.\n */\nexport function convert({\n numStr,\n base,\n to,\n alphabet,\n}: {\n numStr: string\n base: number\n to: number\n alphabet?: string\n}): string {\n // 当base和to相等 或 base和to超出转换范围，则原样返回\n if (base === to || !checkRadixLegal(base) || !checkRadixLegal(to)) {\n return numStr\n }\n\n // 先转成10进制\n let p = 0\n let number10 = 0\n while (p < numStr.length) {\n number10 *= base\n number10 += transformCharToNum(numStr.charAt(p), base)\n p++\n }\n // 若要转换的正好是进制，则直接返回\n if (to === 10) {\n return number10.toString()\n }\n let result = ''\n let cur\n while (number10) {\n cur = number10 % to\n result = transformNumToChar(cur, alphabet) + result\n number10 = Math.floor(number10 / to)\n }\n return 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