overview
kale is a view templating engine for your node.js based RESTful APIs. It allows you to treat the data of your API as you would any other view. The gain here is that you can separate your view logic from your controllers and models. kale can compile to JSON and XML natively but other builders can be plugged in to allow compiling to any other format. The syntax of kale is inspired by the Ruby gem known as rabl.
kale sets out with a few main goals in mind:
- An easy, familiar, way to separate the view logic from your data within RESTful APIs
- A simple, lightweight templating language that makes sense for application data
- Ability to serve your API data in different formats from the same view
Please note that kale is currently in an alpha state. Most features are somewhere between Stability 1 (Experimental) and Stability 2 (Unstable).
installation
npm install kale
usage
Inside our index.jav
file
object @test {
-named
set .foo, .bar, .baz
array .qux => 'quux' {
set .one => '1'
set .two => '2'
}
}
Inside our index.js
file...
var kale = ; var locals = test: foo: 'foo' bar: 'bar' baz: 'baz' qux: one: 'one' two: 'two' one: 'three' two: 'four' ; // Do our actual compelationvar compile = kale;;
Our console output will look like this...
syntax
note: this section is a total work in progress
copy an object from locals
to result
object @foo
copy an object from locals
to result, changing it's name
object @foo => 'bar'
copy an object from locals
to result without adding it to a wrapper object
object @foo {
# If we wanted to set it to true, we'd say +named
-named
}
copy specific properties to object, changing their names
# object @foo
object @app_user => 'user' {
# Do not copy non-specified properties from app_user object
-copy
set ._id => 'id'
set .uname => 'user_name'
}
copy array to object
object @app_user => 'user' {
-copy
# The set keyword can be omitted while inside an object or array
._id => 'id', .uname => 'user_name'
array .user_groups => 'groups' {
._id => 'id'
}
}
accessing 'stringed' keys on an object
object @app_user => 'user' {
-copy
._id => 'id', .uname => 'user_name'
# We can access 'stringed' object keys by using .'the key' notation
.'role id' => 'role_id'
array .user_groups => 'groups' {
._id => 'id'
}
}
should you require more intricate control over a property value, you can use inline javascript. The value return from the inline script will be used as the value for the property, so long as the value is not null or undefined.
note: inline scripting is a WIP and currently very limited in implementation
object @app_user => 'user' {
-copy
._id => 'id', .uname => 'user_name'
.'role id' => 'role_id'
.name %{
return parent.first_name + ' ' + parent.last_name;
%}
array .user_groups => 'groups' {
._id => 'id'
}
}
kale also provides the ability to reuse views by allowing you to mixin existing views. This functionality is currently still in development so it should be considered expirmental. While I don't imagine the API will change for it, I do expect to add a bunch more features to it.
# Inside includes/userGroups.jav
array .user_groups => 'groups' {
._id => 'id'
}
object @app_user => 'user' {
-copy
# The set keyword can be omitted while inside an object or array
._id => 'id', .uname => 'user_name'
include 'includes/userGroups'
}
An express3 middleware is provided so that you can easily render kale views from within your express routes. The examples/express folder has a more complete example, but this is the basics you need to get started...
var kale = require('kale');
app.engine('jav', kale.express('json'));
app.set('views', __dirname + '/views');
app.set('view engine', 'jav');
app.get('/kale', function(request, response) {
response.render('index', { /* locals */ });
});
beta progress
Jison based lexerJison based grammarobject keywordarray keywordset keywordaction configurationcomments- map, reduce, etc...
Parser to AST structureAST to JSON builderObject buildingArray building
Inline Javascript implementationRefactor how options are setView Caching- View AST is cached, in memory, based on fileName.
- Partials Support
Include- Extend
- Javascript helper functions (top-level script)
And...
Tests, tests, and more tests...
license
The MIT License (MIT)
Copyright (c) 2013 Jason LaChapelle
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.