@metaplex-foundation/umi-serializers/dist/cjs/map.cjs

A comprehensive set of serializers for the Umi framework

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var umiSerializersCore = require('@metaplex-foundation/umi-serializers-core');
var umiSerializersNumbers = require('@metaplex-foundation/umi-serializers-numbers');
var errors = require('./errors.cjs');
var utils = require('./utils.cjs');

/**
 * Defines the options for `Map` serializers.
 * @category Serializers
 */

/**
 * Creates a serializer for a map.
 *
 * @param key - The serializer to use for the map's keys.
 * @param value - The serializer to use for the map's values.
 * @param options - A set of options for the serializer.
 * @category Serializers
 */
function map(key, value, options = {}) {
  const size = options.size ?? umiSerializersNumbers.u32();
  return {
    description: options.description ?? `map(${key.description}, ${value.description}; ${utils.getSizeDescription(size)})`,
    fixedSize: utils.getSizeFromChildren(size, [key.fixedSize, value.fixedSize]),
    maxSize: utils.getSizeFromChildren(size, [key.maxSize, value.maxSize]),
    serialize: map => {
      if (typeof size === 'number' && map.size !== size) {
        throw new errors.InvalidNumberOfItemsError('map', size, map.size);
      }
      const itemBytes = Array.from(map, ([k, v]) => umiSerializersCore.mergeBytes([key.serialize(k), value.serialize(v)]));
      return umiSerializersCore.mergeBytes([utils.getSizePrefix(size, map.size), ...itemBytes]);
    },
    deserialize: (bytes, offset = 0) => {
      const map = new Map();
      if (typeof size === 'object' && bytes.slice(offset).length === 0) {
        return [map, offset];
      }
      if (size === 'remainder') {
        while (offset < bytes.length) {
          const [deserializedKey, kOffset] = key.deserialize(bytes, offset);
          offset = kOffset;
          const [deserializedValue, vOffset] = value.deserialize(bytes, offset);
          offset = vOffset;
          map.set(deserializedKey, deserializedValue);
        }
        return [map, offset];
      }
      const [resolvedSize, newOffset] = utils.getResolvedSize(size, bytes, offset);
      offset = newOffset;
      for (let i = 0; i < resolvedSize; i += 1) {
        const [deserializedKey, kOffset] = key.deserialize(bytes, offset);
        offset = kOffset;
        const [deserializedValue, vOffset] = value.deserialize(bytes, offset);
        offset = vOffset;
        map.set(deserializedKey, deserializedValue);
      }
      return [map, offset];
    }
  };
}

exports.map = map;
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