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Make sure model_description always returns a Model instance #112

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16 changes: 12 additions & 4 deletions formulae/model_description.py
Original file line number Diff line number Diff line change
@@ -1,6 +1,8 @@
from .scanner import Scanner
from .parser import Parser
from .resolver import Resolver
from formulae.terms.terms import Model

from formulae.scanner import Scanner
from formulae.parser import Parser
from formulae.resolver import Resolver


def model_description(formula):
Expand All @@ -19,4 +21,10 @@ def model_description(formula):
----------
An object of class ModelTerms with an internal description of the model.
"""
return Resolver(Parser(Scanner(formula).scan()).parse()).resolve()

description = Resolver(Parser(Scanner(formula).scan()).parse()).resolve()

if isinstance(description, Model):
return description

return Model(description)
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