e81e8a8f71
* Revert "Revert "Merge branch 'main' of https://github.com/Uniswap/interface" (#2912)" This reverts commit 7d343dcfbdf75a2f91d28cefce84e4b1bace7b87. * Revert "deleted files" This reverts commit 097b8361d4c09afd3cb681c4622145c555ced884.
73 lines
3.0 KiB
TypeScript
73 lines
3.0 KiB
TypeScript
import { Currency, Token } from '@uniswap/sdk-core'
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import { useMemo } from 'react'
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import { ADDITIONAL_BASES, BASES_TO_CHECK_TRADES_AGAINST, CUSTOM_BASES } from '../constants/routing'
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export function useAllCurrencyCombinations(currencyA?: Currency, currencyB?: Currency): [Token, Token][] {
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const chainId = currencyA?.chainId
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const [tokenA, tokenB] = chainId ? [currencyA?.wrapped, currencyB?.wrapped] : [undefined, undefined]
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const bases: Token[] = useMemo(() => {
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if (!chainId || chainId !== tokenB?.chainId) return []
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const common = BASES_TO_CHECK_TRADES_AGAINST[chainId] ?? []
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const additionalA = tokenA ? ADDITIONAL_BASES[chainId]?.[tokenA.address] ?? [] : []
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const additionalB = tokenB ? ADDITIONAL_BASES[chainId]?.[tokenB.address] ?? [] : []
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return [...common, ...additionalA, ...additionalB]
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}, [chainId, tokenA, tokenB])
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const basePairs: [Token, Token][] = useMemo(
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() =>
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bases
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.flatMap((base): [Token, Token][] => bases.map((otherBase) => [base, otherBase]))
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// though redundant with the first filter below, that expression runs more often, so this is probably worthwhile
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.filter(([t0, t1]) => !t0.equals(t1)),
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[bases]
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)
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return useMemo(
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() =>
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tokenA && tokenB
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? [
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// the direct pair
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[tokenA, tokenB] as [Token, Token],
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// token A against all bases
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...bases.map((base): [Token, Token] => [tokenA, base]),
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// token B against all bases
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...bases.map((base): [Token, Token] => [tokenB, base]),
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// each base against all bases
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...basePairs,
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]
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// filter out invalid pairs comprised of the same asset (e.g. WETH<>WETH)
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.filter(([t0, t1]) => !t0.equals(t1))
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// filter out duplicate pairs
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.filter(([t0, t1], i, otherPairs) => {
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// find the first index in the array at which there are the same 2 tokens as the current
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const firstIndexInOtherPairs = otherPairs.findIndex(([t0Other, t1Other]) => {
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return (t0.equals(t0Other) && t1.equals(t1Other)) || (t0.equals(t1Other) && t1.equals(t0Other))
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})
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// only accept the first occurrence of the same 2 tokens
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return firstIndexInOtherPairs === i
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})
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// optionally filter out some pairs for tokens with custom bases defined
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.filter(([tokenA, tokenB]) => {
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if (!chainId) return true
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const customBases = CUSTOM_BASES[chainId]
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const customBasesA: Token[] | undefined = customBases?.[tokenA.address]
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const customBasesB: Token[] | undefined = customBases?.[tokenB.address]
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if (!customBasesA && !customBasesB) return true
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if (customBasesA && !customBasesA.find((base) => tokenB.equals(base))) return false
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if (customBasesB && !customBasesB.find((base) => tokenA.equals(base))) return false
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return true
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})
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: [],
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[tokenA, tokenB, bases, basePairs, chainId]
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)
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}
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