git ssb

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const cbor = require('borc')
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const TAGS = {
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  id: 41,
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  link: 42,
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  func: 43,
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  mod: 44
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}
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const DEFAULTS = {
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  elem: [],
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  data: Buffer.from([]),
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  id: new cbor.Tagged(TAGS.id, 0),
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  mod: new cbor.Tagged(TAGS.mod, [{}, new cbor.Tagged(TAGS.id, 0)]),
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  link: {'/': null},
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  func: new cbor.Tagged(TAGS.func, 0)
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}
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const decoder = new cbor.Decoder({
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  tags: {
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    [TAGS.id]: val => new ID(val),
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    [TAGS.func]: val => new FunctionRef(...val),
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    [TAGS.mod]: val => new ModuleRef(...val)
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  }
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})
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class Serializable {
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  serialize () {
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    const encoder = new cbor.Encoder()
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    this.encodeCBOR(encoder)
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    return encoder.finalize()
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  }
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  static deserialize (serialized) {
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    return decoder.decodeFirst(serialized)
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  }
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}
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class FunctionRef extends Serializable {
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  constructor (opts) {
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    super()
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    this.identifier = opts.identifier
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    if (!(opts.id instanceof ID)) {
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      opts.id = new ID(opts.id)
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    }
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    this.destId = opts.id
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    this.params = opts.params
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    this.gas = opts.gas
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  }
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  encodeCBOR (gen) {
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    return gen.write(new cbor.Tagged(TAGS.func, [
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      this.identifier,
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      this.params,
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      this.destId
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    ]))
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  }
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  set container (container) {
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    this._container = container
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  }
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}
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class ModuleRef extends Serializable {
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  constructor (ex, id) {
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    super()
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    this.exports = ex
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    this.id = id
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  }
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  getFuncRef (name) {
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    return new FunctionRef({
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      identifier: [false, name],
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      params: this.exports[name],
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      id: this.id
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    })
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  }
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  encodeCBOR (gen) {
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    return gen.write(new cbor.Tagged(TAGS.mod, [this.exports, this.id]))
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  }
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  static fromMetaJSON (json, id) {
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    const exports = {}
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    for (const ex in json.exports) {
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      const type = json.types[json.indexes[json.exports[ex].toString()]].params
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      exports[ex] = type
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    }
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    return new ModuleRef(exports, id)
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  }
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}
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class ID extends Serializable {
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  constructor (id) {
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    super()
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    this.id = id
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  }
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  encodeCBOR (gen) {
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    return gen.write(new cbor.Tagged(TAGS.id, this.id))
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  }
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}
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module.exports = {
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  ID,
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  FunctionRef,
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  ModuleRef,
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  DEFAULTS
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}
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