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# mypy: ignore-errors
MAX_CYCLE = 3000
import itertools
import operator
from typing import Dict, List, Optional
from .. import polyfill, variables
from ..exc import unimplemented
from .base import MutableLocal, VariableTracker
from .constant import ConstantVariable
class ItertoolsVariable(VariableTracker):
def __init__(self, value, **kwargs):
super().__init__(**kwargs)
self.value = value
def __repr__(self):
return f"ItertoolsVariable({self.value})"
def python_type(self):
return type(self.value)
def as_python_constant(self):
return self.value
def call_function(
self, tx, args: "List[VariableTracker]", kwargs: "Dict[str, VariableTracker]"
) -> "VariableTracker":
if (
self.value is itertools.product
and not kwargs
and all(arg.has_unpack_var_sequence(tx) for arg in args)
):
seqs = [arg.unpack_var_sequence(tx) for arg in args]
items = []
for item in itertools.product(*seqs):
items.append(variables.TupleVariable(list(item)))
return variables.ListIteratorVariable(items, mutable_local=MutableLocal())
elif (
self.value is itertools.chain
and not kwargs
and all(arg.has_unpack_var_sequence(tx) for arg in args)
):
seqs = [arg.unpack_var_sequence(tx) for arg in args]
items = list(itertools.chain.from_iterable(seqs))
return variables.ListIteratorVariable(items, mutable_local=MutableLocal())
elif self.value is itertools.accumulate:
from .builtin import BuiltinVariable
if any(key not in ["initial", "func"] for key in kwargs.keys()):
unimplemented(
"Unsupported kwargs for itertools.accumulate: "
f"{','.join(set(kwargs.keys()) - {'initial', 'func'})}"
)
acc = kwargs.get("initial")
if len(args) in [1, 2] and args[0].has_unpack_var_sequence(tx):
seq = args[0].unpack_var_sequence(tx)
if "func" in kwargs and len(args) == 1:
func = kwargs["func"].call_function
elif len(args) == 2:
func = args[1].call_function
elif len(args) == 1:
# Default to operator.add
func = BuiltinVariable(operator.add).call_function
else:
unimplemented(
"itertools.accumulate can only accept one of: `func` kwarg, pos 2 arg"
)
else:
unimplemented("Unsupported arguments for itertools.accumulate")
items = []
if acc is not None:
items.append(acc)
for item in seq:
if acc is None:
acc = item
else:
try:
acc = func(tx, [acc, item], {})
except Exception:
raise unimplemented( # noqa: TRY200
f"Unexpected failure in invoking function during accumulate. Failed running func {func}({item}{acc})"
)
items.append(acc)
return variables.ListIteratorVariable(items, mutable_local=MutableLocal())
elif (
self.value is itertools.combinations
and not kwargs
and len(args) == 2
and args[0].has_unpack_var_sequence(tx)
and args[1].is_python_constant()
):
iterable = args[0].unpack_var_sequence(tx)
r = args[1].as_python_constant()
items = []
for item in itertools.combinations(iterable, r):
items.append(variables.TupleVariable(list(item)))
return variables.ListIteratorVariable(items, mutable_local=MutableLocal())
elif self.value is itertools.groupby:
if any(kw != "key" for kw in kwargs.keys()):
unimplemented(
"Unsupported kwargs for itertools.groupby: "
f"{','.join(set(kwargs.keys()) - {'key'})}"
)
def retrieve_const_key(key):
if isinstance(key, variables.SymNodeVariable):
return key.evaluate_expr()
elif isinstance(key, variables.ConstantVariable):
return key.as_python_constant()
else:
raise unimplemented(
"Unsupported key type for itertools.groupby: " + str(type(key))
)
if len(args) == 1 and args[0].has_unpack_var_sequence(tx):
seq = args[0].unpack_var_sequence(tx)
keyfunc = (
(
lambda x: (
retrieve_const_key(
kwargs.get("key").call_function(tx, [x], {})
)
)
)
if "key" in kwargs
else None
)
else:
unimplemented("Unsupported arguments for itertools.groupby")
result = []
try:
for k, v in itertools.groupby(seq, key=keyfunc):
result.append(
variables.TupleVariable(
[
variables.ConstantVariable.create(k)
if variables.ConstantVariable.is_literal(k)
else k,
variables.ListIteratorVariable(
list(v), mutable_local=MutableLocal()
),
],
mutable_local=MutableLocal(),
)
)
except Exception:
raise unimplemented( # noqa: TRY200
"Unexpected failure when calling itertools.groupby"
)
return variables.ListIteratorVariable(result, mutable_local=MutableLocal())
elif self.value is itertools.repeat:
if len(args) < 2:
return variables.RepeatIteratorVariable(
*args, mutable_local=MutableLocal()
)
from .builder import SourcelessBuilder
return tx.inline_user_function_return(
SourcelessBuilder()(tx, polyfill.repeat), args, kwargs
)
elif self.value is itertools.count:
return variables.CountIteratorVariable(*args, mutable_local=MutableLocal())
elif self.value is itertools.cycle:
return variables.CycleIteratorVariable(*args, mutable_local=MutableLocal())
else:
return super().call_function(tx, args, kwargs)
class IteratorVariable(VariableTracker):
def __init__(self, **kwargs):
super().__init__(**kwargs)
def next_variables(self, tx):
unimplemented("abstract method, must implement")
class RepeatIteratorVariable(IteratorVariable):
def __init__(self, item: VariableTracker, **kwargs):
super().__init__(**kwargs)
self.item = item
# Repeat needs no mutation, clone self
def next_variables(self, tx):
return self.item, self
class CountIteratorVariable(IteratorVariable):
def __init__(self, item: int = 0, step: int = 1, **kwargs):
super().__init__(**kwargs)
if not isinstance(item, VariableTracker):
item = ConstantVariable.create(item)
if not isinstance(step, VariableTracker):
step = ConstantVariable.create(step)
self.item = item
self.step = step
def next_variables(self, tx):
assert self.mutable_local
tx.output.side_effects.mutation(self)
next_item = self.item.call_method(tx, "__add__", [self.step], {})
self.item = next_item
return self.item, self
class CycleIteratorVariable(IteratorVariable):
def __init__(
self,
iterator: IteratorVariable,
saved: List[VariableTracker] = None,
saved_index: int = 0,
item: Optional[VariableTracker] = None,
**kwargs,
):
if saved is None:
saved = []
super().__init__(**kwargs)
self.iterator = iterator
self.saved = saved
self.saved_index = saved_index
self.item = item
def next_variables(self, tx):
assert self.mutable_local
if self.iterator is not None:
try:
new_item, _ = self.iterator.next_variables(tx)
if len(self.saved) > MAX_CYCLE:
unimplemented(
"input iterator to itertools.cycle has too many items"
)
tx.output.side_effects.mutation(self)
self.saved.append(new_item)
self.item = new_item
if self.item is None:
return self.next_variables(tx)
return self.item, self
except StopIteration:
self.iterator = None
return self.next_variables(tx)
elif len(self.saved) > 0:
tx.output.side_effects.mutation(self)
self.saved_index = (self.saved_index + 1) % len(self.saved)
return self.item, self
else:
raise StopIteration
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