textX-jinja 0.4.0

Meta-language for DSL implementation inspired by Xtext

textX-jinja

Jinja based framework for textX generators. Use if you need to generate a set of template-based files from textX models.

How to use?

1. Create a folder containing files and folder which resemble the structure you want to generate. Each file may be a Jinja template (should end with .jinja extension).

2. File names may contain variable parts in the form __<varible name>__ (double underscores around the variable name). These parts of file names will be replaced by the value of the variable from the generator context. If the variable is iterable, a file will be created for each object. In that case, the value for substitution in the file name will be created by function map_names(still WIP!), if given, or str of the object itself. The object will be available in the template context under the name obj. If the variable is of bool type the file will be skipped if the variable value is False.

3. In your textX project register a generator (see registration).

   from textx import generator
   from textxjinja import textx_jinja_generator
   
   @generator('mylang', 'mytarget')
   def mygenerator(metamodel, model, output_path, overwrite, debug):
       # template directory
       template_folder = os.path.join(os.path.dirname(__file__), 'templates')
   
       # create context dict with all variables that should be accessible
       # by templates
       context = {'some_variable': 'some value'}
       
       # Optionally provide Jinja filters
       def striptabs(s):
           return re.sub(r'^[ \t]+', '', s, flags=re.M)
       filters = {
           'striptabs': striptabs
       }
   
       # call the generator
       textx_jinja_generator(template_folder, output_path, context, overwrite, filters)
   

4. Install your project (recommended is the usage of Python virtual environment):

   pip install -e <path to your project>
   

5. Run your textX generator as usual:

   $ textx generate ...
   

The generator will use the template folder for rendering files using Jinja template engine. All files from the template folder which are not Jinja templates (don't end with .jinja' extensions) will be copied over to the target folder unchanged (variable substitutions in file names still apply).

As a full example of its usage see startproject generator in textX-dev project. Templates for the startproject command are here.