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Add count_atoms to GrammaticalExpression #48

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Nov 20, 2024
Merged

Add count_atoms to GrammaticalExpression #48

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cc45132
Add `count_atoms` to `GrammaticalExpression`
Ashvin-Ranjan Nov 19, 2024
671dce6
Fix code in `count_atoms` to be more clear
Ashvin-Ranjan Nov 19, 2024
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4 changes: 4 additions & 0 deletions src/tests/test_grammar.py
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Expand Up @@ -33,6 +33,10 @@ def test_meaning(self):
def test_length(self):
parsed_expression = TestGrammar.grammar.parse(TestGrammar.geq2_expr_str)
assert len(parsed_expression) == 5

def test_atom_count(self):
parsed_expression = TestGrammar.grammar.parse(TestGrammar.geq2_expr_str)
assert parsed_expression.count_atoms() == 3

def test_yield(self):
parsed_expression = TestGrammar.grammar.parse(TestGrammar.geq2_expr_str)
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6 changes: 6 additions & 0 deletions src/ultk/language/grammar.py
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Expand Up @@ -171,6 +171,12 @@ def to_dict(self) -> dict:
if self.children:
the_dict["children"] = tuple(child.to_dict() for child in self.children)
return the_dict

# Following function counts the total number of atoms / leaf nodes, as opposed to __len__, which counts all nodes
def count_atoms(self):
if self.children is None:
return 1
return sum(child.count_atoms() for child in self.children)

@classmethod
def from_dict(cls, the_dict: dict, grammar: "Grammar") -> "GrammaticalExpression":
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