Move grammar into py file

[mrob95]

There have been a couple of reports of the same error (in the chat and here) loading the lark grammar from a text file.

  File "C:\Python27\lib\site-packages\lark_parser-0.7.8-py2.7.egg\lark\lark.py", line 284, in open
    with open(grammar_filename, encoding='utf8') as f:
IOError: [Errno 2] No such file or directory: 'C:\\Python27\\lib\\site-packages\\dragonfly2-0.18.0-py2.7.egg\\dragonfly\\parsing\\grammar.lark'

I'm slightly perplexed by this, and you may have a better idea of what is causing it or how to fix it than I do. Is the pip install process failing to pick up files which are not .py?

If you don't have a nice fix, then this should work. Having what is essentially data defined inside a Python file isn't ideal but it at least fixes the issue for now.

[LexiconCode]

Oh you'll need to include non python files (relative path) in a manifest.in for pip to include them in the package. Setup.py will need to be tweaked to use the manifest.in

Ref: https://python-packaging.readthedocs.io/en/latest/non-code-files.html
Example: https://github.com/dictation-toolbox/Caster/blob/master/MANIFEST.in

[drmfinlay]

I can't remember why this wasn't merged, but it should have been. We define plenty of data in Python files and this grammar is only used once in parser.py.