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import * as Base from 'lib/base'
import * as State from 'state'
import * as Utils from 'serialization/utils'
import * as V0 from 'serialization/v0'
// Encoding
const lastVersion = 0 // max is 62
export function encode(s: State.State): string {
if (s.length == 0) {
return ''
} else {
const version = Base.encode(BigInt(lastVersion), Base.b62)
const xs = V0.encode(s).map(binaryToBase62).join('-')
return `${version}${xs}`
}
}
function binaryToBase62(str: string): string {
// Prepend 1 so that we don’t loose leading 0s
return Base.encode(Base.decode('1' + str, Base.b2), Base.b62)
}
// Decoding
export function decode(encoded: string): State.State {
if (encoded == '') {
return []
} else {
const version = Number(Base.decode(encoded.slice(0, 1), Base.b62))
if (version == 0) return V0.decode(encoded.slice(1).split('-').map(base62ToBinary))
else {
console.error(`Unknown decoder version ${version} in order to decode state.`)
return []
}
}
}
function base62ToBinary(str: string): string {
// Remove prepended 1
return Base.encode(Base.decode(str, Base.b62), Base.b2).slice(1)
}
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