Parse and/or stringify Google Maps proprietary data type (aka !1m3 style)

npm i google-maps-data-ast / yarn add google-maps-data-ast

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import { parse, stringify } from 'google-maps-data-ast';

const data = '!3m1!4b1!4m5!3m4!1s0x0:0xe665b3308d32f379!8m2!3d-37.8805676!4d145.1644849';

const ast = parse(data);

Abstract syntax tree for !3m1!4b1!4m5!3m4!1s0x0:0xe665b3308d32f379!8m2!3d-37.8805676!4d145.1644849:

{
  matrix: {
    '3': {
      id: 3,
      code: 'm',
      type: 'matrix',
      value: '1',
      data: 1,
      children: {
        boolean: {
          '4': { id: 4, code: 'b', type: 'boolean', value: '1', data: true }
        }
      }
    },
    '4': {
      id: 4,
      code: 'm',
      type: 'matrix',
      value: '5',
      data: 5,
      children: {
        matrix: {
          '3': {
            id: 3,
            code: 'm',
            type: 'matrix',
            value: '4',
            data: 4,
            children: {
              string: {
                '1': {
                  id: 1,
                  code: 's',
                  type: 'string',
                  value: '0x0:0xe665b3308d32f379',
                  data: [ 0, 16601872622479930000 ]
                }
              },
              matrix: {
                '8': {
                  id: 8,
                  code: 'm',
                  type: 'matrix',
                  value: '2',
                  data: 2,
                  children: {
                    double: {
                      '3': {
                        id: 3,
                        code: 'd',
                        type: 'double',
                        value: '-37.8805676',
                        data: -37.8805676
                      },
                      '4': {
                        id: 4,
                        code: 'd',
                        type: 'double',
                        value: '145.1644849',
                        data: 145.1644849
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

const modifiedData = stringify({
    ...ast,
    boolean: {
        1: {
            id: 1,
            type: 'boolean',
            value: '0'
        }
    }
})

// is now equivalent to

const modifiedData = '!1b0!3m1!4b1!4m5!3m4!1s0x0:0xe665b3308d32f379!8m2!3d-37.8805676!4d145.1644849'