Merge pull request #282 from gyorilab/epsilon

Handle non-standard unicode characters in models

mira/metamodel/utils.py

@@ -3,12 +3,15 @@
 
 import sympy
 import re
+import unicodedata
 
 
 def get_parseable_expression(s: str) -> str:
     """Return an expression that can be parsed using sympy."""
     s = s.replace('lambda', 'XXlambdaXX')
-    return re.sub(r'\.(?=\D)', 'XX_XX', s)
+    s = re.sub(r'\.(?=\D)', 'XX_XX', s)
+    s = unicodedata.normalize('NFKC', s)
+    return s
 
 
 def revert_parseable_expression(s: str) -> str:

tests/test_metamodel.py

@@ -238,3 +238,9 @@ def test_from_askenet_petri_mathml():
     mathml_str = sorted_json_str(mathml_tm.dict())
     org_str = sorted_json_str(tm.dict())
     assert mathml_str == org_str
+
+
+def test_safe_parse():
+    eps = 'ϵ'
+    eps_sym = sympy.Symbol(eps)
+    assert safe_parse_expr(eps, local_dict={eps: eps_sym}) == eps_sym