def test_concatenation(self):
assert parse_regex(" foo bar ") == Concatenation(
Symbol("foo"),
Symbol("bar"),
)
assert parse_regex(" foo bar baz ") == Concatenation(
Symbol("foo"),
Concatenation(
Symbol("bar"),
Symbol("baz"),
),
)
def test_union(self):
assert parse_regex(" foo | ") == Union(
Symbol("foo"),
None,
)
assert parse_regex(" foo | bar ") == Union(
Symbol("foo"),
Symbol("bar"),
)
assert parse_regex(" foo | bar | baz ") == Union(
Union(
Symbol("foo"),
Symbol("bar"),
),
Symbol("baz"),
)
def test_parentheses(self):
assert parse_regex(" (foo) (bar baz) * (qux quo)") == Concatenation(
Symbol("foo"),
Concatenation(
Star(Concatenation(
Symbol("bar"),
Symbol("baz"),
), ),
Concatenation(
Symbol("qux"),
Symbol("quo"),
),
),
)
def test_wildcard(self):
assert parse_regex(" . ") == Symbol(".")
def test_symbol(self):
assert parse_regex(" foo ") == Symbol("foo")
def test_empty(self):
assert parse_regex(" ") is None
def test_unmatched_opening_parentheses(self):
with pytest.raises(SymbolRegexSyntaxError,
match=r"Unmatched parentheses"):
parse_regex(" ( ( foo )")
def test_modifier_at_start_of_expression(self):
with pytest.raises(SymbolRegexSyntaxError,
match=r"Modifier at start of expression"):
parse_regex(" ? foo ")
def test_modifier_before_parenthesis(self):
with pytest.raises(SymbolRegexSyntaxError,
match=r"Modifier before '\(' at position 1"):
parse_regex(" ( ? foo ) ")
def test_modifier_before_union(self):
with pytest.raises(SymbolRegexSyntaxError,
match=r"Modifier before '\|' at position 2"):
parse_regex("a | ? b")
def test_multiple_modifiers(self):
with pytest.raises(SymbolRegexSyntaxError,
match=r"Multiple modifiers at position 4"):
parse_regex("foo ? *")
def test_query(self):
assert parse_regex(" foo ? ") == Union(Symbol("foo"), None)
def test_plus(self):
assert parse_regex(" foo + ") == Concatenation(
Symbol("foo"),
Star(Symbol("foo")),
)
def test_star(self):
assert parse_regex(" foo * ") == Star(Symbol("foo"))
