A toy templating engine.
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Alex Michael
Latest commit c45896b Apr 13, 2013

README.md

microtemplates.py

A toy templating engine. Accompanying blog post: http://alexmic.net/building-a-template-engine/.

Why?

I just wanted to learn how to write a templating engine. It's not feature-complete or production-ready. It's a playground and it will be a work in progress.

Documentation

There are two types of tags, blocks and variables.

Variables

<div>{{my_var}}</div>

Blocks

There are three types of blocks – if, each and call.

Loops

{% each items %}
    <div>{{it}}</div>
{% end %}

{% each [1,2,3] %}
    <div>{{it}}</div>
{% end %}

it references the current item in the iteration and it is scoped to this item's attributes. To access attributes of the parent context use ... For example:

{% each items %}
    <div>{{..name}}</div><div>{{it}}</div>
{% end %}

Conditionals

Supported operators are: >, >=, <, <=, ==, !=. You can also use conditionals with things that evaluate to truth.

{% if num > 5 %}
    <div>more</div>
{% else %}
    <div>less or equal</div>
{% end %}

{% if items %}
    <div>we have items</div>
{% end %}

Callables

Callables can get passed positional or keyword arguments.

<div class='date'>{% call prettify date_created %}</div>
<div>{% call log 'here' verbosity='debug' %}</div>

Benchmarks

Using benchmarks.py and the templates files in templates/ here are the results:

microtemplates => run 10000 times, took 0.36 ms
django => run 10000 times, took 0.95 ms
django_default_loader => run 10000 times, took 1.16 ms
django_cached_loader => run 10000 times, took 0.46 ms
jinja2 => run 10000 times, took 5.64 ms
jinja2_env => run 10000 times, took 0.08 ms