JSPM – shape-json@1.1.1

Package Exports

shape-json

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (shape-json) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

Installation

Using npm:

npm install shape-json

In Node.js:

var shape = require('shape-json');

Parse input by a scheme defined as json

Consider you want to transform the below json object, into a nested json object we used to from MEAN stack.

var input = [
  {pid: 1, contributor: 'jdalton', projectID: 1, projectName: 'lodash'},
  {pid: 1, contributor: 'jdalton', projectID: 2, projectName: 'docdown'},
  {pid: 1, contributor: 'jdalton', projectID: 3, projectName: 'lodash-cli'},
  {pid: 2, contributor: 'contra',  projectID: 4, projectName: 'gulp'},
  {pid: 3, contributor: 'phated',  projectID: 4, projectName: 'gulp'},
]

Instead of producing a lot of duplicated code to accomplish such transformations. We declare a scheme as a json object:

var scheme = {
  "$group[contributors](pid)": {
    "id": "pid",
    "name": "contributor",
    "$group[projects](projectID)": {
      "id": "projectID",
      "name": "projectName"
    }
  }
};
console.log(shape.parse(input, scheme));

This is what you get:

{
  "contributors": [
    {
      "id": 1,
      "name": "jdalton",
      "projects": [
        {
          "id": 1,
          "name": "lodash"
        },
        {
          "id": 2,
          "name": "docdown"
        },
        {
          "id": 3,
          "name": "lodash-cli"
        }
      ]
    },
    {
      "id": 2,
      "name": "contra",
      "projects": [
        {
          "id": 4,
          "name": "gulp"
        }
      ]
    },
    {
      "id": 3,
      "name": "phated",
      "projects": [
        {
          "id": 4,
          "name": "gulp"
        }
      ]
    }
  ]
}

Parsing nested json objects as input

let scheme = {
  "$mirror(id)": {
    "name": "event.name"
  }
};

let nestedInput = [{
  id: 1,
  event: {
    name: 'lookup',
  }
},{
  id: 2,
  event: {
    name: 'add',
  }
}];
console.log(shape.parse(nestedInput, scheme));

[ { "name": "lookup" }, { "name": "add" } ]

Another example:

var scheme = {
  "$mirror[projects](projectID)": {
    "project": {
      "id": "projectID",
      "name": "projectName"
    }
  }
};
console.log(shape.parse(input, scheme));

{
  "projects": [
    {
      "project": {
        "id": 1,
        "name": "lodash"
      }
    },
    {
      "project": {
        "id": 2,
        "name": "docdown"
      }
    },
    {
      "project": {
        "id": 3,
        "name": "lodash-cli"
      }
    },
    {
      "project": {
        "id": 4,
        "name": "gulp"
      }
    }
  ]
}

The same example as above as Array:

var scheme = {
  "$mirror(projectID)": {
    "project": {
      "id": "projectID",
      "name": "projectName"
    }
  }
};
console.log(shape.parse(input, scheme));

[
  {
    "project": {
      "id": 1,
      "name": "lodash"
    }
  },
  {
    "project": {
      "id": 2,
      "name": "docdown"
    }
  },
  {
    "project": {
      "id": 3,
      "name": "lodash-cli"
    }
  },
  {
    "project": {
      "id": 4,
      "name": "gulp"
    }
  }
]

Extend parse method with own operation

shape.define('growth', function(provider, scheme){
  return provider.map(function(point){
    point.rate *= 100;
    return point;
  });
});

var scheme = {
  "$growth[growth]": {
    "$mirror[rates]": {
      "name": "name",
      "percent": "rate"
    }
  }
};

var input = [
  {
    "name": "test1",
    "rate": 0.1
  },{
    "name": "test2",
    "rate": 0.2
  }
];

var result = shape.parse(input, scheme);
//result equals:
{
  growth: {
    rates: [
      {
        "name": "test1",
        "percent": 10
      },{
        "name": "test2",
        "percent": 20
      }
    ]
  }
}

Create a scheme as object.

var scheme = shape.scheme()
  .mirror({ id: 'pid', last_name: 'lastName' })
  .indexBy('id');

Apply a scheme.

var inputs = [{
  pid: 1,
  lastName: 'Stehle',
  firstName: 'Andre'
},{
  pid: 2,
  lastName: 'lastname',
  firstName: 'firstname'
}];

console.log(scheme.form(inputs));
/*
  {
    1:{
      id: 1,
      last_name: 'Stehle'
    },
    2:{
      id: 2,
      last_name: 'lastname'
    }
  }
*/

API Documentation

mirror a collection

Mirror a json by a scheme.

var input = {
  pid: 1,
  lastName: 'Stehle',
  firstName: 'Andre'
};
var scheme = {
  id: 'pid',
  last_name: 'lastName',
};

console.log(shape.mirror(input, scheme));
/*
  {
    id: 1,
    last_name: 'Stehle'
  }
*/


var inputs = [{
  pid: 1,
  lastName: 'Stehle',
  firstName: 'Andre'
},{
  pid: 2,
  lastName: 'lastname',
  firstName: 'firstname'
}];

console.log(shape.mirror(inputs, scheme));
/*
  [{
    id: 1,
    last_name: 'Stehle'
  },{
    id: 2,
    last_name: 'lastname'
  }]
*/

indexing

Index an Array by a key.

var inputs = [{
  id: 1,
  last_name: 'Stehle'
},{
  id: 2,
  last_name: 'lastname'
}];

console.log(shape.indexBy(inputs, 'id'));
/*
  {
    1:{
      id: 1,
      last_name: 'Stehle'
    },
    2:{
      id: 2,
      last_name: 'lastname'
    }
  }
*/

chaining

Chaining previous examples.

var inputs = [{
  pid: 1,
  lastName: 'Stehle',
  firstName: 'Andre'
},{
  pid: 2,
  lastName: 'lastname',
  firstName: 'firstname'
}];

var result = shape.chain(inputs)
  .mirror(scheme)
  .indexBy('id')
  .collection;
console.log(result);
/*
  {
    1:{
      id: 1,
      last_name: 'Stehle'
    },
    2:{
      id: 2,
      last_name: 'lastname'
    }
  }
*/

shape-json