reverse-mustache

Reverse templating library for mustache, generating variables from a template's output

This was created to explore the untapped reverse templating domain. It was initially inspired by @laktek's extract-values library.

reverseMustache({
  template: 'hello {{#place}}world{{/place}}',
  content: 'hello world'
});
// {world: true}

Getting Started

Install the module with: npm install reverse-mustache

var reverseMustache = require('reverse-mustache');
reverseMustache({
  template: 'hello {{#place}}world{{/place}}',
  content: 'hello world'
});
/*
{
  place: true
}
*/

Documentation

Foreword: The current implementation is quick and dirty to see if the project was possible.

reverse-mustache exposes the reverseMustache function as its module.exports.

reverseMustache(params)

Reverse template output into its original variables

• params Object, container for function parameters
  • template String, template used to generate output
  • content String, output to reverse/extract variables from
  • partials Object|Function, container or function that returns partial templates
    • More info: https://github.com/janl/mustache.js/tree/0.8.1#partials
  • tags String[], 2 item array containing opening and closing tags
    • More info: https://github.com/janl/mustache.js/tree/0.8.1#set-delimiter

Returns:

If reverseMustache cannot resolve variables that match the output, then it will return null.

If the match is successful, it will return an object context.

• context Object, container for state of template
  • tokensByName Object, key-value pairs representing original data
  • We are skipping over other variables which may change later on

Functionality

[x] Reverse text nodes
[x] Reverse boolean conditionals
[x] Reverse escaped variables
[x] Reverse unescaped variables
[x] Reverse for loops
[x] Re-use variables / prevent contradictions
[x] Reverse nested objects/nested paths
[x] Reverse inverted conditionals
[x] Handle comments
[x] Handle partials
[x] Handle alternative open/close tags

Examples

Below are some examples of using reverseMustache

Variables

This is an example where we have a variable in our template

reverseMustache({
  template: 'hello {{place}}',
  content: 'hello moon'
});
// {place: 'moon'}

Partials

This is an example using an object containing partials

reverseMustache({
  template: 'hello {{> place}}',
  content: 'hello moon'
  partials: {
    place: '{{name}}'
  }
});
// {place: {name: 'moon'}}

Tags

This is an example using an alternative open/close tags

reverseMustache({
  template: 'hello <%=place%>',
  content: 'hello moon'
});
// {place: 'moon'}

Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint via grunt and test via npm test.

Donating

Support this project and others by twolfson via gittip.

Unlicense

As of Mar 23 2014, Todd Wolfson has released this repository and its contents to the public domain.

It has been released under the UNLICENSE.