fabpot/Twig — pull request #901 by fabpot (2012-11-15 10:32:07+00:00)
Title: Named arguments and macro default values

This PR contains two new features. Even if they are not related, the code needed to make them work was almost the same.

The first feature is the ability to use named arguments for functions, tests, and filters:

```jinja
{{ data|convert_encoding('UTF-8', 'iso-2022-jp') }}

{# versus #}

{{ data|convert_encoding(from='iso-2022-jp', to='UTF-8') }}
```

The syntax is borrowed from Python where named arguments are part of the language.

The second feature is the ability to defined default values for macro arguments:

```jinja
{% macro input(name, value = "", type = "text", size = 20) %}

{% endmacro %}

```

More information in the updated documentation.

These features have been implemented with BC in mind (which means that the code is not optimal, but it will be completely refactored for Twig 2.0 where we will get rid of all those ridiculous `Twig_Filter_*` and `Twig_Function_*` classes).