site/transform.html at master · SelectTransform/site · GitHub

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<html><head><meta name="viewport" content="width=device-width, initial-scale=1"><script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.11.0/highlight.min.js"></script><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.8.0/styles/railscasts.min.css"><link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Raleway:300,400,500,600,700"><link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Merriweather:900"><link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css"><link rel="stylesheet" href="src/style.css"><script>window.addEventListener('load', function () {
    hljs.configure({ languages: ["javascript"] });
    hljs.initHighlighting();
  });</script></head><body><div><h1 class="center">TRANSFORM</h1><div class="center"><a href="https://selecttransform.github.io/site" class="btn btn-primary">Home</a><a href="https://github.com/SelectTransform/st.js" class="btn btn-primary">Github</a><a href="https://selecttransform.github.io/playground/" class="btn btn-primary">Try</a><a href="https://twitter.com/selecttransform" class="btn btn-primary">Twitter</a></div><div class="container"><h1>API</h1><div><h2 id="1-basic">1. Basic</h2>
<p>Use <code>{{ }}</code> notation to fill out a template with data to generate a new JSON</p>
<div class="row">
<div class="col">
<blockquote>1. Template and Data</blockquote>
<pre><code>
var template = {
  "menu": {
    "flavor": "{{flavor}}",
    "richness": "{{richness}}",
    "garlic amount": "{{garlic_amount}}",
    "green onion?": "{{green_onion}}",
    "sliced pork?": "{{pork_amount}}",
    "secret sauce": "{{sauce_amount}}",
    "noodle's texture": "{{texture}}"
  }
}

var data = {
  "flavor": "strong",
  "richness": "ultra rich",
  "garlic_amount": "1 clove",
  "green_onion": "thin green onion",
  "pork_amount": "with",
  "sauce_amount": "double",
  "texture": "extra firm"
}
</code>
</pre>
</div>
<div class="col">
<blockquote>2. Select and Transform</blockquote>
<pre><code>
ST.select(template)
    .transform(data)
    .root();

// or
// ST.transform(template, data)
</code>
</pre>
</div>
<div class="col">
<blockquote>3. Result</blockquote>
<pre><code>
{
  "menu": {
    "flavor": "strong",
    "richness": "ultra rich",
    "garlic amount": "1 clove",
    "green onion?": "thin green onion",
    "sliced pork?": "with",
    "secret sauce": "double",
    "noodle's texture": "extra firm"
  }
}
</code>
</pre>
</div>
</div>

<h2 id="2-loop">2. Loop</h2>
<p>Use <code>#each</code> to iterate through items</p>
<div class="row">
<div class="col">
<blockquote>1. Template and Data</blockquote>
<pre><code>
var template = {
  "orders": {
    "{{#each customers}}": {
      "order": "One {{menu}} for {{name}}!"
    }
  }
}

var data = {
  "customers": [{
    "name": "Hatter",
    "menu": "miso ramen"
  }, {
    "name": "March Hare",
    "menu": "tonkotsu ramen"
  }, {
    "name": "Dormouse",
    "menu": "miso ramen"
  }, {
    "name": "Alice",
    "menu": "cup noodles"
  }]
}
</code>
</pre>
</div>
<div class="col">
<blockquote>2. Select and Transform</blockquote>
<pre><code>
ST.select(template)
    .transform(data)
    .root();

// or
// ST.transform(template, data)
</code>
</pre>
</div>
<div class="col">
<blockquote>3. Result</blockquote>
<pre><code>
{
  "orders": [{
    "order": "One miso ramen for Hatter!"
  }, {
    "order": "One tonkotsu ramen for March Hare!"
  }, {
    "order": "One miso ramen for Dormouse!"
  }, {
    "order": "One cup noodles for Alice!"
  }]
}
</code>
</pre>
</div>
</div>

<h2 id="3-conditional">3. Conditional</h2>
<p>Use <code>#if</code>/<code>#elseif</code>/<code>#else</code> to selectively fill out a template</p>
<div class="row">
<div class="col">
<blockquote>1. Template and Data</blockquote>
<pre><code>
var template = {
  "response": [{
    "{{#if spicy &lt; 7}}": {
      "message": "Coming right up!"
    }
  }, {
    "{{#elseif spicy &lt; 9}}": {
      "message": "Are you sure? It is very spicy"
    }
  }, {
    "{{#else}}": {
      "message": "Please sign here where it says you're responsible for this decision"
    }
  }]
}

var data = {
  "spicy": 8
}
</code>
</pre>
</div>
<div class="col">
<blockquote>2. Select and Transform</blockquote>
<pre><code>
ST.select(template)
    .transform(data)
    .root();

// or
// ST.transform(template, data)
</code>
</pre>
</div>
<div class="col">
<blockquote>3. Result</blockquote>
<pre><code>
{
  "response": {
    "message": "Are you sure? It is very spicy"
  }
}
</code>
</pre>
</div>
</div>

<h2 id="4-existential-operator">4. Existential Operator</h2>
<p>You can use the existential operator <code>#?</code> to exclude an attribute altogether if the template evaluates to a falsy value.</p>
<div class="row">
<div class="col">
<blockquote>1. Template and Data</blockquote>
<pre><code>
var data = {
  notifications: {
    home: 1,
    invite: 2
  }
};
var template = {
  tabs: [{
    text: "home",
    badge: "{{#? notifications.home}}"
  }, {
    text: "message",
    badge: "{{#? notification.message}}"
  }, {
    text: "invite",
    badge: "{{#? notification.invite}}"
  }]
}
</code>
</pre>
</div>
<div class="col">
<blockquote>2. Select and Transform</blockquote>
<pre><code>
ST.select(template)
    .transform(data)
    .root();

// or
// ST.transform(template, data)
</code>
</pre>
</div>
<div class="col">
<blockquote>3. Result</blockquote>
<pre><code>
{
  tabs: [{
    text: "home",
    badge: 1
  }, {
    text: "message"
  }, {
    text: "invite",
    badge: 2
  }]
}
</code>
</pre>
</div>
</div>

<h2 id="5-concat">5. Concat</h2>
<p>You can concatenate multiple items and arrays into a single array using the <code>#concat</code> operator.</p>
<div class="row">
<div class="col">
<blockquote>1. Template and Data</blockquote>
<pre><code>
var data = {
  numbers: [1,2,3]
};
var template = {
  "items": {
    "{{#concat}}": [
      {
        "type": "label",
        "text": "Length: {{numbers.length}}"
      },
      {
        "{{#each numbers}}": {
          "type": "label",
          "text": "{{this}}"
        }
      }
    ]
  }
};
</code>
</pre>
</div>
<div class="col">
<blockquote>2. Select and Transform</blockquote>
<pre><code>
ST.select(template)
    .transform(data)
    .root();

// or
// ST.transform(template, data)
</code>
</pre>
</div>
<div class="col">
<blockquote>3. Result</blockquote>
<pre><code>
{
  "items": [{
    "type": "label",
    "text": "Length: 3"
  }, {
    "type": "label",
    "text": 1
  }, {
    "type": "label",
    "text": 2
  }, {
    "type": "label",
    "text": 3
  }]
}
</code>
</pre>
</div>
</div>

<h2 id="6-merge">6. Merge</h2>
<p>You can merge multiple objects into a single object using the <code>#merge</code> operator. If there are any overlapping attributes, the ones that come later will override the previously set attribute.</p>
<div class="row">
<div class="col">
<blockquote>1. Template and Data</blockquote>
<pre><code>
var data = {
  numbers: [1,2,3],
  align: "right",
  size: "14"
};
var template = {
  "{{#merge}}": [
    {
      "type": "label",
      "text": "Length: {{numbers.length}}"
    },
    {
      "style": {
        "align": "{{align}}",
        "size": "{{size}}"
      },
      "action": {
        "type": "$render"
      }
    }
  ]
};
</code>
</pre>
</div>
<div class="col">
<blockquote>2. Select and Transform</blockquote>
<pre><code>
ST.select(template)
    .transform(data)
    .root();

// or
// ST.transform(template, data)
</code>
</pre>
</div>
<div class="col">
<blockquote>3. Result</blockquote>
<pre><code>
{
  "type": "label",
  "text": "Length: 3",
  "style": {
    "align": "right",
    "size": "14"
  },
  "action": {
    "type": "$render"
  }
}
</code>
</pre>
</div>
</div>

<h2 id="7-inline-javascript">7. Inline JavaScript</h2>
<p>You can use ANY native javascript expression inside the template.</p>
<div class="row">
<div class="col">
<blockquote>1. Template and Data</blockquote>
<pre><code>
var template = {
  "ranking": {
    "{{#each players.sort(function(p1, p2) { return p2.quantity - p1.quantity; }) }}": "{{name}} ate {{quantity}}"
  },
  "winner": "{{players.sort(function(p1, p2) { return p2.quantity - p1.quantity; })[0].name }}"
};
var data = {
  "players": [{
    "name": "Alice",
    "quantity": 102
  }, {
    "name": "Mad Hatter",
    "quantity": 108
  }, {
    "name": "Red Queen",
    "quantity": 100
  }]
};
</code>
</pre>
</div>
<div class="col">
<blockquote>2. Select and Transform</blockquote>
<pre><code>
ST.select(template)
    .transform(data)
    .root();

// or
// ST.transform(template, data)
</code>
</pre>
</div>
<div class="col">
<blockquote>3. Result</blockquote>
<pre><code>
{
  "ranking": [
    "Mad Hatter ate 108",
    "Alice ate 102",
    "Red Queen ate 100"
  ],
  "winner": "Mad Hatter"
}
</code>
</pre>
</div>
</div>

<h2 id="8-root">8. $root</h2>
<p>Sometimes you need to refer to the root data object while iterating through an <code>#each</code> loop.</p>
<p>In this case you can use a special keyword named <code>$root</code>.</p>
<div class="row">
<div class="col">
<blockquote>1. Template and Data</blockquote>
<pre><code>
var template = {
  "{{#each posts}}": [
    "{{content}}",
    "{{$root.users[user_id]}}"
  ]
}
var data = {
  users: ["Alice", "Bob", "Carol"],
  posts: [{
    content: "Show me the money",
    user_id: 1
  }, {
    content: "hello world",
    user_id: 0
  }, {
    content: "what is the meaning of life?",
    user_id: 2
  }]
}
</code>
</pre>
</div>
<div class="col">
<blockquote>2. Select and Transform</blockquote>
<pre><code>
ST.select(template)
    .transform(data)
    .root();

// or
// ST.transform(template, data)
</code>
</pre>
</div>
<div class="col">
<blockquote>3. Result</blockquote>
<pre><code>
[
  ["Show me the money", "Bob"],
  ["hello world", "Alice"],
  ["what is the meaning of life?", "Carol"]
]
</code>
</pre>
</div>
</div>

<h2 id="9-index">9. $index</h2>
<p>You can use a special variable named <code>$index</code> within <code>#each</code> loops.</p>
<div class="row">
<div class="col">
<blockquote>1. Template and Data</blockquote>
<pre><code>

const template = {
  "rows": {
    "{{#each items}}": {
      "row_number": "{{$index}}",
      "columns": {
        "{{#each this}}": {
          "content": "{{this}}",
          "column_number": "{{$index}}"
        }
      }
    }
  }
};
const data = {
  "items": [
    ['a','b','c','d','e'],
    [1,2,3,4,5]
  ]
};

const result = ST.select(template)
                 .transform(data)
                 .root()

// or
// const result = ST.transform(template, data)

</code>
</pre>
</div>
<div class="col">
<blockquote>2. Select and Transform</blockquote>
<pre><code>
ST.select(template)
    .transform(data)
    .root();

// or
// ST.transform(template, data)
</code>
</pre>
</div>
<div class="col">
<blockquote>3. Result</blockquote>
<pre><code>
{
  "rows": [
    {
      "row_number": 0,
      "columns": [
        {
          "content": "a",
          "column_number": 0
        },
        {
          "content": "b",
          "column_number": 1
        },
        {
          "content": "c",
          "column_number": 2
        },
        {
          "content": "d",
          "column_number": 3
        },
        {
          "content": "e",
          "column_number": 4
        }
      ]
    },
    {
      "row_number": 1,
      "columns": [
        {
          "content": 1,
          "column_number": 0
        },
        {
          "content": 2,
          "column_number": 1
        },
        {
          "content": 3,
          "column_number": 2
        },
        {
          "content": 4,
          "column_number": 3
        },
        {
          "content": 5,
          "column_number": 4
        }
      ]
    }
  ]
}
</code>
</pre>
</div>
</div>

<h2 id="10-local-variables">10. Local Variables</h2>
<p>You can use <code>#let</code> API to declare local variables. The <code>#let</code> API takes an <strong>array</strong> as a paremeter, which has two elements:</p>
<ol>
<li><strong>The first parameter:</strong> the <code>{{#let}}</code> statement which assigns any value to a variable</li>
<li><strong>The second parameter:</strong> the actual expression that will be evaluated</li>
</ol>
<p>Here's an example:</p>
<div class="row">
<div class="col">
<blockquote>1. Template and Data</blockquote>
<pre><code>

const data = {
  families: [{
    location: "Wonderland",
    members: [{
      name: "Alice"
    }, {
      name: "Bob"
    }]
  }, {
    location: "Springfield",
    members: [{
      name: "Bart"
    }, {
      name: "Marge"
    }, {
      name: "Lisa"
    }, {
      name: "Homer"
    }, {
      name: "Maggie"
    }]
  }]
}
const template = {
  "rows": {
    "{{#each families}}": {
      "{{#let}}": [{
        "family_location": "{{location}}"
      }, {
        "{{#each members}}": {
          "type": "label",
          "text": "{{name}} in {{family_location}}"
        }
      }]
    }
  }
}

</code>
</pre>
</div>
<div class="col">
<blockquote>2. Select and Transform</blockquote>
<pre><code>

const result = ST.select(template)
                 .transform(data)
                 .root()

// or
// const result = ST.transform(template, data)

</code>
</pre>
</div>
<div class="col">
<blockquote>3. Result</blockquote>
<pre><code>

{
  "rows": [
    [
      {
        "type": "label",
        "text": "Alice in Wonderland"
      },
      {
        "type": "label",
        "text": "Bob in Wonderland"
      }
    ],
    [
      {
        "type": "label",
        "text": "Bart in Springfield"
      },
      {
        "type": "label",
        "text": "Marge in Springfield"
      },
      {
        "type": "label",
        "text": "Lisa in Springfield"
      },
      {
        "type": "label",
        "text": "Homer in Springfield"
      },
      {
        "type": "label",
        "text": "Maggie in Springfield"
      }
    ]
  ]
}

</code>
</pre>
</div>
</div>

<p>The local variable feature is important when you are using nested loops. You could use the <code>$root</code> variable to reach out of the current loop context, but this has limitations, because you can always only reach out to the root level.</p>
<p><br></p>
<p>By using the <code>#let</code> API, you can define a variable at any level of a loop and have it accessible from anywhere further down the loop <strong>WITHOUT using the <code>$root</code> variable</strong>.</p>
<hr>
</div></div><div class="container"><h1>Syntax</h1><div><p>There are 2 ways of transforming an object:</p>
<h2 id="1-transform-">1. transform()</h2>
<p>Select a template or its subtree, and transform data with the selected template.</p>
<blockquote>
<p>ST.select(<code>TEMPLATE</code>).transform(<code>DATA</code>)</p>
</blockquote>
<pre><code>ST.select({
      "{{#each items}}": {
        "type": "label",
        "text": "{{name}}"
      }
    })
    .transform({
      items: [
        { id: 1, name: "Ja" },
        { id: 2, name: "Ka" },
        { id: 3, name: "La" }
      ]
    })
    .root();
</code></pre><h2 id="2-transformwith-">2. transformWith()</h2>
<p>Select a data object or its subtree and transform with a template. </p>
<blockquote>
<p>ST.select(<code>DATA</code>).transformWith(<code>TEMPLATE</code>)</p>
</blockquote>
<pre><code>ST.select({
      items: [
        { id: 1, name: "Ja" },
        { id: 2, name: "Ka" },
        { id: 3, name: "La" }
      ]
    })
    .transformWith({
      "{{#each items}}": {
        "type": "label",
        "text": "{{name}}"
      }
    })
    .root();
</code></pre><hr>
</div></div><div class="container"><h1>Examples</h1><div><h2 id="1-use-only-a-subtree-of-a-template">1. Use only a subtree of a template</h2>
<p>Sometimes you don't want to use the entire template to parse data. In this case you can <strong>select a subtree of a template</strong> and use that to parse data.</p>
<p><br></p>
<pre><code>var template = {
  body: {
    sections: [{
      items: {
        "{{#each items}}": {
          type: "{{type}}",
          url: "{{url}}"
        }
      }
    }]
  }
};

var finalTemplate = ST.select(template, function(key, val) {
                          return key === 'type';
                        })
                        .transform({ type: "image" }).root();

/*
finalTemplate = {
  body: {
    sections: [{
      items: {
        "{{#each items}}": {
          type: "image",
          url: "{{url}}"
        }
      }
    }]
  }
}
*/
</code></pre><h2 id="2-filter-data-transform-with-template">2. Filter Data + Transform with template</h2>
<p>Sometimes you have a large set of data but only want to transform a portion of it. In this case you can <strong>select a subtree of the data object</strong> and parse using a template.</p>
<p><br></p>
<pre><code>var data = {
  "item": { "url": "http://localhost", "text": "localhost" },
  "items": [
    { "url": "file://documents", "text": "documents" },
    { "url": "https://blahblah.com", "text": "blah"  }
  ],
  "nestedItems": {
    "childItems": [{
      "url": "http://hahaha.com",
      "text": "haha"
    }, {
      "url": "https://hohoho.com",
      "text": "hoho"
    }]
  }
};

var selection = ST.select(data, function(key, val) {
  return key === 'url';
});

var urls = selection.values();
/**
*  urls = [
*    "http://localhost",
*    "file://documents",
*    "https://blahblah.com",
*    "http://hahaha.com",
*    "https://hohoho.com"
*  ]
*/

var transformed = selection.transformWith({
  "tag": "&lt;a href='{{url}}'&gt;{{text}}&lt;/a&gt;"
})

var objects = transformed.objects()
/**
* objects = [
*   { "tag": "&lt;a href='http://localhost'&gt;localhost&lt;/a&gt;" },
*   { "tag": "&lt;a href='file://documents'&gt;documents&lt;/a&gt;" },
*   { "tag": "&lt;a href='https://blahblah.com'&gt;blah&lt;/a&gt;" },
*   { "tag": "&lt;a href='https://hahaha.com'&gt;haha&lt;/a&gt;" },
*   { "tag": "&lt;a href='https://hohoho.com'&gt;hoho&lt;/a&gt;" }
* ]
*/

var values = transformed.values()
/**
* values = [
*   "&lt;a href='http://localhost'&gt;localhost&lt;/a&gt;",
*   "&lt;a href='file://documents'&gt;documents&lt;/a&gt;",
*   "&lt;a href='https://blahblah.com'&gt;blah&lt;/a&gt;",
*   "&lt;a href='https://hahaha.com'&gt;haha&lt;/a&gt;",
*   "&lt;a href='https://hohoho.com'&gt;hoho&lt;/a&gt;"
* ]
*/

var keys = transformed.keys()
/**
* keys = ["tag", "tag", "tag", "tag", "tag"]
*/


var root = transformed.root()
/**
* root = {
*   "item": {
*     "tag": "&lt;a href='http://localhost'&gt;localhost&lt;/a&gt;"
*   },
*   "items": [
*     { "tag": "&lt;a href='file://documents'&gt;documents&lt;/a&gt;" },
*     { "tag": "&lt;a href='https://blahblah.com'&gt;blah&lt;/a&gt;" },
*   ],
*   "nestedItems": {
*     "childItems": [
*       { "tag": "&lt;a href='https://hahaha.com'&gt;haha&lt;/a&gt;" },
*       { "tag": "&lt;a href='https://hohoho.com'&gt;hoho&lt;/a&gt;" }
*     ]
*   }
* };
*/

var transformed = ST.select({
  "{{#each items}}": {
    tag: "&lt;a href='{{url}}'&gt;{{text}}&lt;/a&gt;"
  }
}).transform({ items: urls });

var root = transformed.root();
/*
root = {
  "item": { "tag": "&lt;a href='http://localhost'&gt;localhost&lt;/a&gt;" },
  "items": [
    { "tag": "&lt;a href='file://documents'&gt;documents&lt;/a&gt;" },
    { "tag": "&lt;a href='https://blahblah.com'&gt;blah&lt;/a&gt;" }
  ],
  "nestedItems": {
    "childItems": {
      "tag": "&lt;a href='http://hahaha.com'&gt;haha&lt;/a&gt;"
    },
    "tag": "&lt;a href='https://hohoho.com'&gt;hoho&lt;/a&gt;"
  }
}
*/

var keys = transformed.keys();
/*
keys = ["tag", "tag", "tag", "tag", "tag"];
*/

var values = transformed.values();
/*
values = [
  "&lt;a href='http://localhost'&gt;localhost&lt;/a&gt;",
  "&lt;a href='file://documents'&gt;documents&lt;/a&gt;",
  "&lt;a href='https://blahblah.com'&gt;blah&lt;/a&gt;",
  "&lt;a href='http://hahaha.com'&gt;haha&lt;/a&gt;",
  "&lt;a href='https://hohoho.com'&gt;hoho&lt;/a&gt;"
]
*/

var objects = transformed.objects();
/*
objects = [
  { "tag": "&lt;a href='http://localhost'&gt;localhost&lt;/a&gt;" },
  { "tag": "&lt;a href='file://documents'&gt;documents&lt;/a&gt;" },
  { "tag": "&lt;a href='https://blahblah.com'&gt;blah&lt;/a&gt;" },
  { "tag": "&lt;a href='http://hahaha.com'&gt;haha&lt;/a&gt;" },
  { "tag": "&lt;a href='https://hohoho.com'&gt;hoho&lt;/a&gt;" }
]
*/

var paths = transformed.paths();
</code></pre><h2 id="3-nesting-templates">3. Nesting Templates</h2>
<p>Sometimes you may want to reuse a template by nesting inside another template. In this case you just need to select a subtree of the parent template and plug in a child template.</p>
<p><br></p>
<pre><code>var data = {
  "item": { "url": "http://localhost" },
  "items": [
    { "url": "file://documents" },
    { "url": "https://blahblah.com" }
  ],
  "nestedItems": {
    "childItems": [{
      "url": "http://hahaha.com",
      "text": "haha"
    }, {
      "url": "https://hohoho.com",
      "text": "hoho"
    }]
  }
};
var template = {
  "items": {
    "{{#each items}}": "{{partial}}"
  }
}
var partial = {
  "type": "label",
  "text": "{{name}}"
}
var selected = ST.select(template, function(key, val) {
  return val === '{{partial}}';
})
var finalTemplate = selected.transform({
  "partial": {
    "type": "label",
    "text": "{{name}}"
  }
}).root();

/*
  finalTemplate = {
    "items": {
      "{{#each items}}": {
        "type": "label",
        "text": "{{name}}"
      }
    }
  }
*/
</code></pre><hr>
</div></div></div></body></html>