def _generate_token_list():
return [
Connector.build(TerminalSymbol.OPEN),
Variable.build('x'),
Connector.build(TerminalSymbol.PLUS),
Variable.build('y'),
Connector.build(TerminalSymbol.CLOSE)
]
def _str_to_token_list(expr):
token_list = []
for char in expr:
if char in TERMINAL_SYMBOL_TRANSLATIONS:
token_list.append(
Connector.build(TERMINAL_SYMBOL_TRANSLATIONS[char]))
else:
token_list.append(Variable.build(char))
return token_list
def _generate_production_from_terminal_symbols(terminal_symbols):
# List of variable names to generate test variables from
variable_names = ['d', 'c', 'b', 'a']
# Build Token from each supplied TerminalSymbol & add to production
production = []
for ts in terminal_symbols:
if ts is not TerminalSymbol.VARIABLE:
production.append(Connector.build(ts))
else:
production.append(Variable.build(variable_names.pop()))
return production
def test_get_next_production_populated_list():
token_list = [Connector.build(TerminalSymbol.OPEN)]
result = NonTerminalSymbol.EXPRESSION._get_next_production(token_list)
assert result is PRODUCTIONS[NonTerminalSymbol.EXPRESSION][
TerminalSymbol.OPEN]
def test_build_returns_internal_node():
node = LeafNode.build(Connector.build(TerminalSymbol.PLUS))
assert type(node) == LeafNode
def test_is_fruitful_returns_true():
ln = LeafNode.build(Connector.build(TerminalSymbol.PLUS))
assert ln.is_fruitful()
def test_to_list_with_connector():
conn = Connector.build(TerminalSymbol.PLUS)
ln = LeafNode.build(conn)
assert ln.to_list() == [conn]
def test_str_with_connector():
ln = LeafNode.build(Connector.build(TerminalSymbol.PLUS))
assert str(ln) == '+'
def test_match_1_token_seq__1_token_prod_fails():
_, _, seq = _generate_1_token_symbol_sequence()
prod = [Connector.build(TerminalSymbol.MINUS)]
state = seq.match(prod)
assert state is FAILURE
def test_connector_not_equal():
conn = Connector.build(TerminalSymbol.PLUS)
conn2 = Connector.build(TerminalSymbol.MINUS)
assert conn != conn2
def test_error_on_no_token_type():
with pytest.raises(ValueError):
Connector.build(None)
def test_connector_str_invalid_type():
conn = Connector.build(AbstractToken())
with pytest.raises(ValueError):
str(conn)
def test_connector_str():
assert str(Connector.build(TerminalSymbol.DIVIDE)) == '/'
def test_connector_type_matches():
conn = Connector.build(TerminalSymbol.MINUS)
assert Connector.matches(conn, TerminalSymbol.MINUS)
def test_connector_caching():
conn = Connector.build(TerminalSymbol.PLUS)
assert conn is Connector.build(TerminalSymbol.PLUS)
def test_error_on_variable_token_type():
with pytest.raises(ValueError):
Connector.build(TerminalSymbol.VARIABLE)