@findeth/abi/lib/es/parsers/tuple.js

A tiny Solidity ABI encoder and decoder

import { getParser, isDynamicParser, pack, unpack } from '../packer';
const TUPLE_REGEX = /^\((.*)\)$/;
export const getTupleElements = type => {
  return type.slice(1, -1).split(',').map(type => type.trim());
};
export const tuple = {
  isDynamic(type) {
    const elements = getTupleElements(type);
    return elements.some(element => {
      const parser = getParser(element);
      return isDynamicParser(parser, element);
    });
  },

  isType(type) {
    return TUPLE_REGEX.test(type);
  },

  encode({
    type,
    buffer,
    value
  }) {
    const elements = getTupleElements(type);
    return pack(elements, value, buffer);
  },

  decode({
    type,
    value,
    skip
  }) {
    const elements = getTupleElements(type);
    const length = elements.length * 32 - 32;

    if (!isDynamicParser(this, type)) {
      skip(length);
    }

    return unpack(elements, value);
  }

};
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