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Implement list index #324

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merged 1 commit into from
Jan 31, 2024
Merged

Implement list index #324

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22 changes: 22 additions & 0 deletions opshin/tests/test_stdlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,28 @@ def validator(x: Dict[int, bytes], y: int) -> bytes:
exp = None
self.assertEqual(ret, exp, "dict[] returned wrong value")

@given(st.data())
def test_list_index(self, data):
source_code = """
def validator(x: List[int], z: int) -> int:
return x.index(z)
"""
xs = data.draw(st.lists(st.integers()))
z = data.draw(
st.one_of(st.sampled_from(xs), st.integers())
if len(xs) > 0
else st.integers()
)
try:
ret = eval_uplc_value(source_code, xs, z)
except RuntimeError as e:
ret = None
try:
exp = xs.index(z)
except ValueError:
exp = None
self.assertEqual(ret, exp, "list.index returned wrong value")

@given(xs=st.dictionaries(st.integers(), st.binary()))
def test_dict_keys(self, xs):
source_code = """
Expand Down
42 changes: 42 additions & 0 deletions opshin/types.py
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Original file line number Diff line number Diff line change
Expand Up @@ -843,6 +843,48 @@ class ListType(ClassType):
def __ge__(self, other):
return isinstance(other, ListType) and self.typ >= other.typ

def attribute_type(self, attr) -> "Type":
if attr == "index":
return InstanceType(
FunctionType(frozenlist([self.typ]), IntegerInstanceType)
)
super().attribute_type(attr)

def attribute(self, attr) -> plt.AST:
if attr == "index":
return OLambda(
["self", "x"],
OLet(
[("x", plt.Force(OVar("x")))],
plt.Apply(
plt.RecFun(
OLambda(
["index", "xs", "a"],
plt.IteNullList(
OVar("xs"),
plt.TraceError("Did not find element in list"),
plt.Ite(
plt.EqualsInteger(
OVar("x"), plt.HeadList(OVar("xs"))
),
OVar("a"),
plt.Apply(
OVar("index"),
OVar("index"),
plt.TailList(OVar("xs")),
plt.AddInteger(OVar("a"), plt.Integer(1)),
),
),
),
),
),
OVar("self"),
plt.Integer(0),
),
),
)
super().attribute(attr)

def stringify(self, recursive: bool = False) -> plt.AST:
return OLambda(
["self"],
Expand Down