# 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