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import {ABIEncoder} from '../serializer/encoder'
import {ABIDecoder} from '../serializer/decoder'
import {isInstanceOf} from '../utils'
import {Int64, Int64Type, Name, NameType, UInt64} from '../'
export type AssetType = Asset | string
export class Asset implements ABISerializableObject {
static abiName = 'asset'
units: Int64
symbol: Asset.Symbol
static from(value: AssetType): Asset
static from(value: number, symbol: Asset.SymbolType): Asset
static from(value: AssetType | number, symbol?: Asset.SymbolType) {
if (isInstanceOf(value, Asset)) {
return value
}
switch (typeof value) {
case 'number':
Iif (!symbol) {
throw new Error('Symbol is required when creating Asset from number')
}
return this.fromFloat(value, symbol)
case 'string':
return this.fromString(value)
default:
throw new Error('Invalid asset')
}
}
static fromString(value: string) {
const parts = (typeof value === 'string' ? value : '').split(' ')
if (parts.length !== 2) {
throw new Error('Invalid asset string')
}
const amount = parts[0].replace('.', '')
const precision = (parts[0].split('.')[1] || '').length
const symbol = Asset.Symbol.fromParts(parts[1], precision)
return new Asset(Int64.from(amount), symbol)
}
static fromFloat(value: number, symbol: Asset.SymbolType) {
const s = Asset.Symbol.from(symbol)
return new Asset(s.convertFloat(value), s)
}
static fromUnits(value: Int64Type, symbol: Asset.SymbolType) {
return new Asset(Int64.from(value), Asset.Symbol.from(symbol))
}
static fromABI(decoder: ABIDecoder): Asset {
const units = Int64.fromABI(decoder)
const symbol = Asset.Symbol.fromABI(decoder)
return new Asset(units, symbol)
}
static abiDefault() {
return new this(Int64.from(0), Asset.Symbol.abiDefault())
}
static formatUnits(units: Int64Type, precision: number) {
const digits = Int64.from(units).toString().split('')
let negative = false
if (digits[0] === '-') {
negative = true
digits.shift()
}
while (digits.length <= precision) {
digits.unshift('0')
}
if (precision > 0) {
digits.splice(digits.length - precision, 0, '.')
}
let rv = digits.join('')
if (negative) {
rv = '-' + rv
}
return rv
}
constructor(units: Int64, symbol: Asset.Symbol) {
this.units = units
this.symbol = symbol
}
equals(other: AssetType) {
const {symbol, units} = Asset.from(other)
return this.symbol.value.equals(symbol.value) && this.units.equals(units)
}
get value(): number {
return this.symbol.convertUnits(this.units)
}
set value(newValue: number) {
this.units = this.symbol.convertFloat(newValue)
}
get quantity(): string {
return Asset.formatUnits(this.units, this.symbol.precision)
}
toABI(encoder: ABIEncoder) {
this.units.toABI(encoder)
this.symbol.toABI(encoder)
}
toString() {
return this.quantity + ' ' + this.symbol.name
}
toJSON() {
return this.toString()
}
}
export namespace Asset {
export type SymbolType = Symbol | UInt64 | string
export class Symbol implements ABISerializableObject {
static abiName = 'symbol'
static maxPrecision = 18
static from(value: SymbolType) {
if (isInstanceOf(value, Symbol)) {
return value
}
if (isInstanceOf(value, UInt64)) {
return new Symbol(value)
}
const parts = value.split(',')
if (parts.length !== 2 && value !== '0,') {
throw new Error('Invalid symbol string')
}
if (value === '0,') {
parts.push('')
}
const precision = Number.parseInt(parts[0])
return Symbol.fromParts(parts[1], precision)
}
static fromParts(name: string, precision: number) {
return new Symbol(toRawSymbol(name, precision))
}
static fromABI(decoder: ABIDecoder): Symbol {
return new Symbol(UInt64.fromABI(decoder))
}
static abiDefault() {
return this.from('4,SYS') // CORE_SYMBOL = 4,CORE_SYMBOL_NAME
}
value: UInt64
constructor(value: UInt64) {
if (toSymbolPrecision(value) > Symbol.maxPrecision) {
throw new Error('Invalid asset symbol, precision too large')
}
if (!value.equals(0) && !SymbolCode.pattern.test(toSymbolName(value))) {
throw new Error('Invalid asset symbol, name must be uppercase A-Z')
}
this.value = value
}
equals(other: SymbolType) {
return this.value.equals(Symbol.from(other).value)
}
get name(): string {
return toSymbolName(this.value)
}
get precision(): number {
return toSymbolPrecision(this.value)
}
get code(): SymbolCode {
return new SymbolCode(UInt64.from(this.value.value.clone().iushrn(8)))
}
toABI(encoder: ABIEncoder) {
this.value.toABI(encoder)
}
/**
* Convert units to floating point number according to symbol precision.
* @throws If the given units can't be represented in 53 bits.
**/
convertUnits(units: Int64): number {
return units.value.toNumber() / Math.pow(10, this.precision)
}
/**
* Convert floating point to units according to symbol precision.
* Note that the value will be rounded to closest precision.
**/
convertFloat(float: number): Int64 {
return Int64.from(float.toFixed(this.precision).replace('.', ''))
}
toString() {
return `${this.precision},${this.name}`
}
toJSON() {
return this.toString()
}
}
export type SymbolCodeType = SymbolCode | UInt64 | string | number
export class SymbolCode implements ABISerializableObject {
static abiName = 'symbol_code'
static pattern = /^[A-Z]{0,7}$/
static from(value: SymbolCodeType) {
Iif (isInstanceOf(value, SymbolCode)) {
return value
}
if (typeof value === 'string') {
value = UInt64.from(toRawSymbolCode(value))
}
return new this(UInt64.from(value))
}
static fromABI(decoder: ABIDecoder) {
return new SymbolCode(UInt64.fromABI(decoder))
}
static abiDefault() {
return this.from('SYS') // CORE_SYMBOL_NAME
}
value: UInt64
constructor(value: UInt64) {
Iif (!value.equals(0) && !SymbolCode.pattern.test(toSymbolName(value))) {
throw new Error('Invalid asset symbol, name must be uppercase A-Z')
}
this.value = value
}
equals(other: SymbolCodeType) {
return this.value.equals(SymbolCode.from(other).value)
}
toABI(encoder: ABIEncoder) {
this.value.toABI(encoder)
}
toString() {
return charsToSymbolName(this.value.value.toArray('be'))
}
toJSON() {
return this.toString()
}
}
}
export type ExtendedAssetType = ExtendedAsset | {quantity: AssetType; contract: NameType}
export class ExtendedAsset implements ABISerializableObject {
static abiName = 'extended_asset'
static from(value: ExtendedAssetType) {
Iif (isInstanceOf(value, ExtendedAsset)) {
return value
}
return new this(Asset.from(value.quantity), Name.from(value.contract))
}
static fromABI(decoder: ABIDecoder) {
return new ExtendedAsset(Asset.fromABI(decoder), Name.fromABI(decoder))
}
quantity: Asset
contract: Name
constructor(quantity: Asset, contract: Name) {
this.quantity = quantity
this.contract = contract
}
equals(other: ExtendedAssetType) {
return this.quantity.equals(other.quantity) && this.contract.equals(other.contract)
}
toABI(encoder: ABIEncoder) {
this.quantity.toABI(encoder)
this.contract.toABI(encoder)
}
toJSON() {
return {
quantity: this.quantity,
contract: this.contract,
}
}
}
export type ExtendedSymbolType = ExtendedSymbol | {sym: Asset.SymbolType; contract: NameType}
export class ExtendedSymbol implements ABISerializableObject {
static abiName = 'extended_symbol'
static from(value: ExtendedSymbolType) {
Iif (isInstanceOf(value, ExtendedSymbol)) {
return value
}
return new this(Asset.Symbol.from(value.sym), Name.from(value.contract))
}
static fromABI(decoder: ABIDecoder) {
return new ExtendedSymbol(Asset.Symbol.fromABI(decoder), Name.fromABI(decoder))
}
sym: Asset.Symbol
contract: Name
constructor(sym: Asset.Symbol, contract: Name) {
this.sym = sym
this.contract = contract
}
equals(other: ExtendedSymbolType) {
return this.sym.equals(other.sym) && this.contract.equals(other.contract)
}
toABI(encoder: ABIEncoder) {
this.sym.toABI(encoder)
this.contract.toABI(encoder)
}
toJSON() {
return {
sym: this.sym,
contract: this.contract,
}
}
}
function toSymbolPrecision(rawSymbol: UInt64) {
return rawSymbol.value.and(UInt64.from(0xff).value).toNumber()
}
function toSymbolName(rawSymbol: UInt64) {
const chars = rawSymbol.value.toArray('be').slice(0, -1)
return charsToSymbolName(chars)
}
function charsToSymbolName(chars: number[]) {
return chars
.map((char) => String.fromCharCode(char))
.reverse()
.join('')
}
function toRawSymbol(name: string, precision: number) {
const code = toRawSymbolCode(name)
const bytes = new Uint8Array(code.length + 1)
bytes[0] = precision
bytes.set(code, 1)
return UInt64.from(bytes)
}
function toRawSymbolCode(name: string) {
const length = Math.min(name.length, 7)
const bytes = new Uint8Array(length)
for (let i = 0; i < length; i++) {
bytes[i] = name.charCodeAt(i)
}
return bytes
}
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