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harttle 5b5dfd5c00 documents for whitespace control (#17 )

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feature: whitespace control, fixes #17

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README.md

shopify-liquid

A feature-rich Liquid template engine for Node.js and browsers, with compliance with the Ruby version. New to Liquid? Here's a live demo: http://harttle.com/shopify-liquid/

The Liquid template engine is implemented in Ruby originally, which is used by Jekyll and Github Pages.

Features:

Pretty much builtin filters and builtin tags
Async rendering, especially for tags
any-promise

Installation:

npm install --save shopify-liquid

Render from String

Parse and Render:

var Liquid = require('shopify-liquid');
var engine = Liquid();

engine.parseAndRender('{{name | capitalize}}', {name: 'alice'})
    .then(function(html){
        // html === 'Alice'
    });

Caching templates:

var tpl = engine.parse('{{name | capitalize}}');
engine.render(tpl, {name: 'alice'})
    .then(function(html){   
        // html === 'Alice'
    });

Render from File

var engine = Liquid({
root: path.resolve(__dirname, 'views/'),  // for layouts and includes, default: ["."]
    extname: '.liquid',          // default: '.liquid'
    cache: false,                // default: false
    trim_right: false,           // default: false
    trim_left: false,            // default: false
    strict_filters: false,       // default: false
    strict_variables: false      // default: false
});
engine.renderFile("hello.liquid", {name: 'alice'})
    .then(function(html){
       // html === 'Alice'
    });
// equivalent to: 
engine.renderFile("hello", {name: 'alice'})
    .then(function(html){
       // html === 'Alice'
    });

root is a directory or an array of directories to resolve layouts and includes, as well as the filename passed in when calling .renderFile(). If an array, the files are looked up in the order they occur in the array. Defaults to process.cwd()
extname is used to lookup the template file when filepath doesn't include an extension name. Defaults to .liquid
cache indicates whether or not to cache resolved templates. Defaults to false.
strict_filters is used to enable strict filter existence. If set to false, undefined filters will be rendered as empty string. Otherwise, undefined filters will cause an exception. Defaults to false.
strict_variables is used to enable strict variable derivation. If set to false, undefined variables will be rendered as empty string. Otherwise, undefined variables will cause an exception. Defaults to false.
trim_right is used to strip whitespace (including whitespace, tabs, line feeds, etc. which is implemented by ECMA RegExp \s) from the right of tags ({% %}) and output markups ({{ }}).
trim_left is the same with trim_right, whereas it trims from the left.

{%- -%} or {{- -}} markups also works to trim whitespace, see Whitespace Control.

Use with Express.js

// register liquid engine
app.engine('liquid', engine.express({
    strict_variables: true,         // Default: fasle
    strict_filters: true            // Default: false
})); 
app.set('views', './views');            // specify the views directory
app.set('view engine', 'liquid');       // set to default

There's an Express demo here.

When using with Express.js, partials(includes and layouts) will be looked up in both Liquid root and Express views directories.

Use in Browser

Download the dist files and import into your HTML. And window.Liquid is what you want. There's also a demo.

<html lang="en">
<head>
  <script src="dist/liquid.min.js"></script>
</head>
<body>
  <script>
    var engine = window.Liquid();
    var src = '{{ name | capitalize}}';
    var ctx = {
      name: 'welcome to Shopify Liquid'
    };
    engine.parseAndRender(src, ctx)
      .then(function(html) {
        // html === Welcome to Shopify Liquid 
      });
  </script>
</body>
</html>

Note: In IE and Android UC browser, you need a Promise implementation registered to any-promise.

Includes

// file: color.liquid
color: '{{ color }}' shape: '{{ shape }}'

// file: theme.liquid
{% assign shape = 'circle' %}
{% include 'color' %}
{% include 'color' with 'red' %}
{% include 'color', color: 'yellow', shape: 'square' %}

The output will be:

color: '' shape: 'circle'
color: 'red' shape: 'circle'
color: 'yellow' shape: 'square'

Layouts

// file: default-layout.liquid
Header
{% block content %}My default content{% endblock %}
Footer

// file: page.liquid
{% layout "default-layout" %}
{% block content %}My page content{% endblock %}

The output of page.liquid:

Header
My page content
Footer

It's possible to define multiple blocks.
block name is optional when there's only one block.

Register Filters

// Usage: {{ name | uppper }}
engine.registerFilter('upper', function(v){
    return v.toUpperCase();
});

See existing filter implementations: https://github.com/harttle/shopify-liquid/blob/master/filters.js

Register Tags

// Usage: {% upper name%}
engine.registerTag('upper', {
    parse: function(tagToken, remainTokens) {
        this.str = tagToken.args; // name
    },
    render: function(scope, hash) {
        var str = Liquid.evalValue(this.str, scope); // 'alice'
        return Promise.resolve(str.toUpperCase()); // 'Alice'
    }
});

See existing tag implementations: https://github.com/harttle/shopify-liquid/blob/master/tags/

Contribution Guide

Write a test to define the feature you want.
Just initiate an issue, or optionally:
Get your test pass and make a pull request.