ProblemParser cannot handle numerics with arguments in goal

[MichaelJFishman]

Subject of the issue

The problem parser seems unable to parse goals which use numerics with arguments.

Your environment

• OS: Ubuntu
• Python version: 3.10.10
• Package Version 0.4.0

Steps to reproduce

    with open("my_problem.pddl", "r") as f:
        problem = ProblemParser()(f.read())

Where my_problem.pddl holds hello-world-functions/p0.pddl, modified to use an argument for the numeric:

(define (problem hello-3-times)
    (:domain hello-world-functions)

    (:init
        ; if this was undefined, some planners would not assumed `0`
        (= (hello_counter jimmy) 0)
    )

    (:goal
        (>= (hello_counter jimmy) 3)
    )
)

Expected behaviour

The problem should be parsed.

Actual behaviour

I get this error:

Traceback (most recent call last):
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 124, in _call_userfunc
    return f(children)
  File "/home/pddl/pddl/parser/problem.py", line 199, in f_head
    return self._domain_transformer.f_head(args)
  File "/home/pddl/pddl/parser/domain.py", line 389, in f_head
    variables = [Variable(x, {}) for x in args[2:-1]]
  File "/home/pddl/pddl/parser/domain.py", line 389, in <listcomp>
    variables = [Variable(x, {}) for x in args[2:-1]]
  File "/home/pddl/pddl/logic/terms.py", line 126, in __init__
    super().__init__(name, type_tags=type_tags)
  File "/home/pddl/pddl/logic/terms.py", line 45, in __init__
    self._name = parse_name(term_name)
  File "/home/pddl/pddl/custom_types.py", line 62, in parse_name
    return name(s)
  File "/home/pddl/pddl/helpers/base.py", line 163, in __init__
    self._handle_no_match()
  File "/home/pddl/pddl/helpers/base.py", line 166, in _handle_no_match
    raise ValueError(
ValueError: Value 'Tree('domain__constant', [Token('domain__NAME', 'jimmy')])' does not match the regular expression re.compile('[A-Za-z][-_A-Za-z0-9]*')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  <redacted>
  File "/home/pddl/pddl/parser/problem.py", line 250, in __call__
    formula = self._transformer.transform(tree)
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 161, in transform
    return self._transform_tree(tree)
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 156, in _transform_tree
    children = list(self._transform_children(tree.children))
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 146, in _transform_children
    res = self._transform_tree(c)
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 156, in _transform_tree
    children = list(self._transform_children(tree.children))
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 146, in _transform_children
    res = self._transform_tree(c)
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 156, in _transform_tree
    children = list(self._transform_children(tree.children))
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 146, in _transform_children
    res = self._transform_tree(c)
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 156, in _transform_tree
    children = list(self._transform_children(tree.children))
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 146, in _transform_children
    res = self._transform_tree(c)
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 156, in _transform_tree
    children = list(self._transform_children(tree.children))
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 146, in _transform_children
    res = self._transform_tree(c)
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 157, in _transform_tree
    return self._call_userfunc(tree, children)
  File "/home/username/mambaforge/envs/env_name/lib/python3.10/site-packages/lark/visitors.py", line 128, in _call_userfunc
    raise VisitError(tree.data, tree, e)
lark.exceptions.VisitError: Error trying to process rule "f_head":

Value 'Tree('domain__constant', [Token('domain__NAME', 'jimmy')])' does not match the regular expression re.compile('[A-Za-z][-_A-Za-z0-9]*')

[haz]

Fixed with #103

[MichaelJFishman]

Thanks!