Popularity
5.3
Declining
Activity
0.0
Stable
10
2
3

Monthly Downloads: 17
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags: Text    
Latest version: v0.3.3.0

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README

haiji

A typed template engine, subset of jinja2

CI

Haiji is a template engine which is subset of jinja2. This is designed to free from the unintended rendering result by strictly typed variable interpolation.

Typed Template

{{ foo }}

For example, this jinja2 template requires "foo". A dictionary which provides a variable "foo" is required to render it. If a variable "foo" does not exist in a given dictionary, jinja2 evaluates it to an empty string, whereas haiji treats this case as compile error.

Support Features

Variables

You can use a dot to access attributes of a variable.

{{ foo.bar }}

Filters

  • abs
  • length
{{ foo|length|abs }}

Control Structures

If

{% if foo %}foo{% elif bar %}bar{% else %}baz{% endif %}

For

{% for bar in foo %}
  loop: {{ bar }}
{% endfor %}

Assignments

{% for y in ys %}
{% set prev_loop = loop %}
{% for x in xs %}
{{ prev_loop.index0 }} {{ loop.index0 }}
{% endfor %}
{% endfor %}

Don't support

  • immediate value assignment
  • multiple targets
  • namespace objects
  • block assignments

Include

{% include "parts.html" %}

Extends

Base template

<html>
<head>
{% block head %}
  <title>{{ foo }}{% block title %}{% endblock %}</title>
{% endblock %}
</head>
<body>
  {{ bar }}
  {% block missing %}child missing this block{% endblock %}
</body>
</html>

Child template

{% extends "parent.tmpl" %}
{% block title %}{{ super() }}{{ baz }}{{ super() }}{% endblock %}
{% block head %}
 {{ super() }}
 <style type="text/css"></style>
{% endblock %}

Escaping

Raw block

{% raw %}
  <ul>
  {% for item in seq %}
    <li>{{ item }}</li>
  {% endfor %}
  </ul>
{% endraw %}

Comments

{# a comment #}

Expressions

Literals

Integer Literals

{{ 123 }}

Boolean Literals

{{ true }}
{{ false }}

Arithmetics

{{ foo + bar}}
{{ foo - bar}}
{{ foo * bar}}
{{ foo // bar}}
{{ foo % bar}}
{{ foo ** bar}}

Comparisons

{{ foo == bar }}
{{ foo != bar }}
{{ foo > bar }}
{{ foo >= bar }}
{{ foo < bar }}
{{ foo <= bar }}

Logic

{{ foo and bar }}
{{ foo or bar }}

Functions

  • range
{% for i in range(n) %}{{ i }}{% endfor %}

Testing

The tests can be run with stack:

$ stack test

In order to run the tests, you need a python2 binary on your PATH, and the jinja2 python library installed.