def test_parse_partial():
node = Node("$", "123")
given = [node, node]
with pytest.raises(ValueError):
parse(term("$"), given)
import pytest
from katana.utils import Node, Pair, prepare
from katana.term import term, null
K = term('k')
N = Node('k', 'data')
B = Node('b', 'data')
def test_null():
given = prepare([N])
after = given
assert null(given) == after
def test_term():
given = prepare([N])
after = Pair([N], [])
assert K(given) == after
def test_term_multiple():
given = prepare([N,B])
after = Pair([N], [B])
assert K(given) == after
def test_term_no_match():
given = prepare([B])
with pytest.raises(ValueError):
def test_parse():
node = Node("$", "123")
given = [node]
after = [node]
assert parse(term("$"), given) == after
import pytest
from pyrsistent import v
from katana.utils import Node, Pair, prepare
from katana.compound import sequence, group, repeat, option, maybe
from katana.term import term
Ta, Tb, Tc = [term(k) for k in 'abc']
Na, Nb, Nc = [Node(k, 'data') for k in 'abc']
def test_sequence():
s = sequence(Ta, Tb)
given = prepare([Na, Nb])
after = Pair([Na, Nb], [])
assert s(given) == after
def test_group():
g = group(Ta)
given = prepare([Na])
after = Pair([Node(g, [Na])], [])
assert g(given) == after
def test_group_with_prefix():
g = group(Ta)
given = Pair(v(Nb), v(Na))
after = Pair([Nb, Node(g, [Na])], [])
assert g(given) == after