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refactor: modularize Assets structure
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6 files changed

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‎packages/evolution/src/core/Assets/Label.ts‎

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import { ParseResult, Schema } from "effect"
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import * as Bytes from "../Bytes.js"
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/**
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* CRC8 implementation for label checksum calculation.
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* Uses polynomial 0x07 (x^8 + x^2 + x + 1) as per CIP-67 specification.
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*
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* @since 2.0.0
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* @category internal
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*/
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function crc8(data: Uint8Array): number {
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let crc = 0
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for (let i = 0; i < data.length; i++) {
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crc ^= data[i]
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for (let j = 0; j < 8; j++) {
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if (crc & 0x80) {
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crc = (crc << 1) ^ 0x07
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} else {
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crc = crc << 1
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}
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}
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}
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return crc & 0xff
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}
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/**
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* Generate checksum for a hex-encoded number.
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*
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* @since 2.0.0
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* @category internal
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*/
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function checksum(num: string): string {
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return crc8(Bytes.fromHex(num)).toString(16).padStart(2, "0")
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}
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/**
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* Convert a number to a CIP-67 label format.
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* Creates an 8-character hex string with format: 0[4-digit-hex][2-digit-checksum]0
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*
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* Reference: https://cips.cardano.org/cip/CIP-67
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*
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* @since 2.0.0
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* @category conversions
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* @example
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* ```typescript
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* import * as Label from "@evolution-sdk/core/Label"
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*
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* const label = Label.toLabel(222)
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* // => "000de1400"
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* ```
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*/
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export const toLabel = (num: number): string => {
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if (num < 0 || num > 65535) {
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throw new Error(`Label ${num} out of range: min label 0 - max label 65535.`)
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}
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const numHex = num.toString(16).padStart(4, "0")
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return "0" + numHex + checksum(numHex) + "0"
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}
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/**
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* Parse a CIP-67 label format back to a number.
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* Returns undefined if the label format is invalid or checksum doesn't match.
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*
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* Reference: https://cips.cardano.org/cip/CIP-67
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*
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* @since 2.0.0
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* @category conversions
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* @example
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* ```typescript
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* import * as Label from "@evolution-sdk/core/Label"
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*
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* const num = Label.fromLabel("000de1400")
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* // => 222
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*
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* const invalid = Label.fromLabel("00000000")
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* // => undefined
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* ```
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*/
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export const fromLabel = (label: string): number | undefined => {
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if (label.length !== 8 || !(label[0] === "0" && label[7] === "0")) {
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return undefined
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}
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const numHex = label.slice(1, 5)
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const num = parseInt(numHex, 16)
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const check = label.slice(5, 7)
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return check === checksum(numHex) ? num : undefined
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}
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/**
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* Schema for validating and parsing CIP-67 labels.
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* Decodes hex string labels to numbers and encodes numbers to label format.
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*
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* @since 2.0.0
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* @category schemas
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* @example
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* ```typescript
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* import * as Label from "@evolution-sdk/core/Label"
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* import { Schema } from "effect"
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*
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* const decoded = Schema.decodeSync(Label.LabelFromHex)("000de1400")
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* // => 222
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*
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* const encoded = Schema.encodeSync(Label.LabelFromHex)(222)
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* // => "000de1400"
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* ```
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*/
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export const LabelFromHex = Schema.transformOrFail(
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Schema.String.pipe(
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Schema.pattern(/^0[0-9a-fA-F]{6}0$/, {
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message: () => "Label must be 8 hex characters starting and ending with 0"
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})
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),
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Schema.Int.pipe(Schema.between(0, 65535)),
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{
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strict: true,
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decode: (label, _, ast) => {
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const num = fromLabel(label)
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if (num === undefined) {
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return ParseResult.fail(
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new ParseResult.Type(
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ast,
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label,
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"Invalid label: checksum mismatch"
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)
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)
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}
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return ParseResult.succeed(num)
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},
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encode: (num) => ParseResult.succeed(toLabel(num))
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}
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).annotations({
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identifier: "Label.LabelFromHex",
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description: "CIP-67 compliant label with checksum validation"
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})

‎packages/evolution/src/core/Assets/Unit.ts‎

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import { Schema } from "effect"
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import * as AssetName from "../AssetName.js"
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import * as Bytes from "../Bytes.js"
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import * as PolicyId from "../PolicyId.js"
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import * as Label from "./Label.js"
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/**
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* Unit represents the concatenation of PolicyId and AssetName as a single hex string.
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* Format: policyId (56 chars) + assetName (0-64 chars)
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* Special case: "lovelace" represents ADA
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*
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* @since 2.0.0
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* @category model
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*/
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export type Unit = string
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/**
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* Result of parsing a Unit string.
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*
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* @since 2.0.0
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* @category model
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*/
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export interface UnitDetails {
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policyId: PolicyId.PolicyId
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assetName: AssetName.AssetName | null
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name: AssetName.AssetName | null
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label: number | null
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}
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/**
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* Parse a Unit string into its components.
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* Extracts policy ID, asset name, and CIP-67 label if present.
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*
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* @since 2.0.0
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* @category conversions
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* @example
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* ```typescript
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* import * as Unit from "@evolution-sdk/core/Assets/Unit"
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*
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* // NFT with CIP-67 label 222
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* const details = Unit.fromUnit("a0b1c2...policyId...000de140...name...")
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* // => {
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* // policyId: PolicyId,
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* // assetName: AssetName,
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* // name: AssetName (without label),
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* // label: 222
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* // }
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*
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* // Regular token without label
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* const token = Unit.fromUnit("a0b1c2...policyId...tokenName")
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* // => { policyId, assetName, name, label: null }
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* ```
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*/
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export const fromUnit = (unit: Unit): UnitDetails => {
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const policyIdHex = unit.slice(0, 56)
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const assetNameHex = unit.slice(56) || null
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const policyId = Schema.decodeSync(PolicyId.FromHex)(policyIdHex)
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if (!assetNameHex) {
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return {
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policyId,
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assetName: null,
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name: null,
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label: null
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}
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}
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const assetName = Schema.decodeSync(AssetName.FromHex)(assetNameHex)
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// Check for CIP-67 label (first 8 chars of asset name)
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if (assetNameHex.length >= 8) {
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const potentialLabel = assetNameHex.slice(0, 8)
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const labelNum = Label.fromLabel(potentialLabel)
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if (labelNum !== undefined) {
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// Has valid label, extract name without label
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const nameHex = assetNameHex.slice(8)
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const name = nameHex ? Schema.decodeSync(AssetName.FromHex)(nameHex) : null
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return {
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policyId,
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assetName,
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name,
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label: labelNum
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}
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}
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}
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// No label found
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return {
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policyId,
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assetName,
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name: assetName,
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label: null
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}
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}
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/**
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* Construct a Unit string from components.
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* Combines policy ID, optional CIP-67 label, and asset name.
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*
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* @since 2.0.0
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* @category conversions
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* @throws {Error} If asset name exceeds 32 bytes
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* @throws {Error} If policy ID is invalid length
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* @example
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* ```typescript
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* import * as Unit from "@evolution-sdk/core/Assets/Unit"
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*
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* // With CIP-67 label
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* const unit = Unit.toUnit(policyId, "name", 222)
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* // => "policyId" + "000de140" + "name"
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*
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* // Without label
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* const simple = Unit.toUnit(policyId, "tokenName")
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* // => "policyId" + "tokenName"
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*
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* // Policy only (no asset name)
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* const policyOnly = Unit.toUnit(policyId)
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* // => "policyId"
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* ```
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*/
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export const toUnit = (
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policyId: PolicyId.PolicyId,
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name?: AssetName.AssetName | string | null,
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label?: number | null
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): Unit => {
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const policyIdHex = Schema.encodeSync(PolicyId.FromHex)(policyId)
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if (policyIdHex.length !== 56) {
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throw new Error(`Policy id invalid: ${policyIdHex}`)
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}
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if (!name && !label) {
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return policyIdHex
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}
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const nameHex = name ? (typeof name === "string" ? name : Bytes.toHex(name.bytes)) : ""
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const labelHex = label !== null && label !== undefined ? Label.toLabel(label) : ""
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const totalHex = labelHex + nameHex
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if (totalHex.length > 64) {
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throw new Error("Asset name size exceeds 32 bytes.")
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}
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return policyIdHex + totalHex
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}
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/**
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* Check if a value is the special "lovelace" unit.
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*
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* @since 2.0.0
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* @category predicates
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*/
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export const isLovelace = (unit: Unit): boolean => unit === "lovelace"
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/**
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* Schema for validating Unit strings.
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*
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* @since 2.0.0
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* @category schemas
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*/
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export const UnitSchema = Schema.String.pipe(
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Schema.filter(
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(s) => s === "lovelace" || (s.length >= 56 && s.length <= 120 && /^[0-9a-fA-F]+$/.test(s)),
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{
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message: () => 'Unit must be "lovelace" or hex string (56-120 chars)'
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}
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)
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).annotations({
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identifier: "Assets.Unit",
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description: "Unit identifier for native assets (policyId + assetName)"
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})

packages/evolution/src/core/Assets.ts renamed to packages/evolution/src/core/Assets/index.ts

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import { Effect as Eff, Equal, FastCheck, Hash, Inspectable, ParseResult, Schema } from "effect"
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import * as AssetName from "./AssetName.js"
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import * as CBOR from "./CBOR.js"
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import * as Coin from "./Coin.js"
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import * as MultiAsset from "./MultiAsset.js"
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import * as PolicyId from "./PolicyId.js"
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import * as PositiveCoin from "./PositiveCoin.js"
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import * as AssetName from "../AssetName.js"
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import * as CBOR from "../CBOR.js"
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import * as Coin from "../Coin.js"
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import * as MultiAsset from "../MultiAsset.js"
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import * as PolicyId from "../PolicyId.js"
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import * as PositiveCoin from "../PositiveCoin.js"
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/**
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* Assets representing both ADA and native tokens.

‎packages/evolution/src/core/TxOut.ts‎

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@@ -1,7 +1,7 @@
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import { Either as E, Equal, FastCheck, Hash, Inspectable, ParseResult, Schema } from "effect"
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import * as Address from "./Address.js"
4-
import * as Assets from "./Assets.js"
4+
import * as Assets from "./Assets/index.js"
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import * as CBOR from "./CBOR.js"
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import * as DatumOption from "./DatumOption.js"
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import * as ScriptRef from "./ScriptRef.js"

‎packages/evolution/src/sdk/Assets.ts‎

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Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@ import { Effect as Eff, ParseResult, Schema } from "effect"
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import * as Equal from "effect/Equal"
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import * as AssetName from "../core/AssetName.js"
5-
import * as CoreAssets from "../core/Assets.js"
5+
import * as CoreAssets from "../core/Assets/index.js"
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import * as CoreMint from "../core/Mint.js"
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import * as MultiAsset from "../core/MultiAsset.js"
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import * as NonZeroInt64 from "../core/NonZeroInt64.js"

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