index.ts

import { getAddress } from '@ethersproject/address'
import { AddressZero } from '@ethersproject/constants'
import { Contract } from '@ethersproject/contracts'
import { JsonRpcSigner, Web3Provider } from '@ethersproject/providers'
import { Token } from '@uniswap/sdk-core'
import { FeeAmount } from '@uniswap/v3-sdk/dist/'
import { TokenAddressMap } from '../state/lists/hooks'

// returns the checksummed address if the address is valid, otherwise returns false
export function isAddress(value: any): string | false {
  try {
    return getAddress(value)
  } catch {
    return false
  }
}

// shorten the checksummed version of the input address to have 0x + 4 characters at start and end
export function shortenAddress(address: string, chars = 4): string {
  const parsed = isAddress(address)
  if (!parsed) {
    throw Error(`Invalid 'address' parameter '${address}'.`)
  }
  return `${parsed.substring(0, chars + 2)}...${parsed.substring(42 - chars)}`
}

// account is not optional
function getSigner(library: Web3Provider, account: string): JsonRpcSigner {
  return library.getSigner(account).connectUnchecked()
}

// account is optional
function getProviderOrSigner(library: Web3Provider, account?: string): Web3Provider | JsonRpcSigner {
  return account ? getSigner(library, account) : library
}

// account is optional
export function getContract(address: string, ABI: any, library: Web3Provider, account?: string): Contract {
  if (!isAddress(address) || address === AddressZero) {
    throw Error(`Invalid 'address' parameter '${address}'.`)
  }

  return new Contract(address, ABI, getProviderOrSigner(library, account) as any)
}

export function escapeRegExp(string: string): string {
  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&') // $& means the whole matched string
}

export function isTokenOnList(tokenAddressMap: TokenAddressMap, token?: Token): boolean {
  return Boolean(token?.isToken && tokenAddressMap[token.chainId]?.[token.address])
}

export function formattedFeeAmount(feeAmount: FeeAmount): number {
  return feeAmount / 10000
}