Question about option -recursion-limit

[Hanseltu]

Hi, there.

Thanks for your awesome tool! I am playing dharma nowadays and I have a question about the "-recursion-limit" option.

In the --help output, "-recursion-limit" represents the max python recursion limit. I doubt that is this the grammar recursion limit, either？

For example,

%%% test.dg
%section% := value

statement :=
    +ifstatement+

ifstatement :=
    if (1) { +statement+ }

%section% := variable

%section% := variance

main :=
    +statement+

Above grammar rule may usually be used when defining a specific language, but dharma rejects this with "ERROR: No path to leaf in force-leaf mode in value test:statement".

Also, when I used the example in dharma

$dharma -grammars dharma/grammars/canvas2d.dg -storage . -count 1 -recursion-limit 5
Traceback (most recent call last):
  File "/usr/local/bin/dharma", line 11, in <module>
  File "/usr/local/lib/python3.5/dist-packages/dharma-1.3.2-py3.5.egg/dharma/dharma.py", line 61, in main
  File "/usr/lib/python3.5/logging/__init__.py", line 1747, in basicConfig
RecursionError: maximum recursion depth exceeded while calling a Python object
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 53, in apport_excepthook
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 26, in enabled
RecursionError: maximum recursion depth exceeded while calling a Python object

Original exception was:
Traceback (most recent call last):
  File "/usr/local/bin/dharma", line 11, in <module>
  File "/usr/local/lib/python3.5/dist-packages/dharma-1.3.2-py3.5.egg/dharma/dharma.py", line 61, in main
  File "/usr/lib/python3.5/logging/__init__.py", line 1747, in basicConfig
RecursionError: maximum recursion depth exceeded while calling a Python object

So, my question is that is this similar recursion grammar can be defined in .dg? What is the difference between grammar max recursion limit and the option "-recursion-limit"?

Please understand if I state something wrong. Any suggestions are welcome. Thank you very much!