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package com.oracle.graal.python.builtins.objects.itertools;

import static com.oracle.graal.python.builtins.PythonBuiltinClassType.StopIteration;
import static com.oracle.graal.python.builtins.PythonBuiltinClassType.ValueError;
import static com.oracle.graal.python.nodes.ErrorMessages.INVALID_ARGS;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__ITER__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__NEXT__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__REDUCE__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__SETSTATE__;

import com.oracle.graal.python.builtins.Builtin;
import java.util.List;

import com.oracle.graal.python.builtins.CoreFunctions;
import com.oracle.graal.python.builtins.PythonBuiltinClassType;
import com.oracle.graal.python.builtins.PythonBuiltins;
import com.oracle.graal.python.builtins.modules.BuiltinFunctions;
import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.tuple.PTuple;
import com.oracle.graal.python.lib.PyObjectGetIter;
import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
import com.oracle.graal.python.nodes.function.builtins.PythonBinaryBuiltinNode;
import com.oracle.graal.python.nodes.function.builtins.PythonUnaryBuiltinNode;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.graal.python.nodes.util.CannotCastException;
import com.oracle.graal.python.nodes.util.CastToJavaIntLossyNode;
import com.oracle.graal.python.runtime.exception.PException;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateNodeFactory;
import com.oracle.truffle.api.dsl.NodeFactory;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.profiles.BranchProfile;
import com.oracle.truffle.api.profiles.LoopConditionProfile;

@CoreFunctions(extendClasses = {PythonBuiltinClassType.PIslice})
public final class IsliceBuiltins extends PythonBuiltins {

    @Override
    protected List<? extends NodeFactory<? extends PythonBuiltinBaseNode>> getNodeFactories() {
        return IsliceBuiltinsFactory.getFactories();
    }

    @Builtin(name = __ITER__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class IterNode extends PythonUnaryBuiltinNode {
        @Specialization
        static Object iter(PIslice self) {
            return self;
        }
    }

    @Builtin(name = __NEXT__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class NextNode extends PythonUnaryBuiltinNode {
        @Specialization(guards = "isNone(self.getIterable())")
        Object next(@SuppressWarnings("unused") PIslice self) {
            throw raise(StopIteration);
        }

        @Specialization(guards = "!isNone(self.getIterable())")
        Object next(VirtualFrame frame, PIslice self,
                        @Cached BuiltinFunctions.NextNode nextNode,
                        @Cached LoopConditionProfile loopProfile,
                        @Cached BranchProfile nextExceptionProfile,
                        @Cached BranchProfile nextExceptionProfile2,
                        @Cached BranchProfile setNextProfile) {
            Object it = self.getIterable();
            int stop = self.getStop();
            Object item;
            while (loopProfile.profile(self.getCnt() < self.getNext())) {
                try {
                    item = nextNode.execute(frame, it, PNone.NO_VALUE);
                } catch (PException e) {
                    nextExceptionProfile.enter();
                    // C code uses any exception to clear the iterator
                    self.setIterable(PNone.NONE);
                    throw e;
                }
                self.setCnt(self.getCnt() + 1);
            }
            if (stop != -1 && self.getCnt() >= stop) {
                self.setIterable(PNone.NONE);
                throw raise(StopIteration);
            }
            try {
                item = nextNode.execute(frame, it, PNone.NO_VALUE);
            } catch (PException e) {
                nextExceptionProfile2.enter();
                self.setIterable(PNone.NONE);
                throw e;
            }
            self.setCnt(self.getCnt() + 1);
            int oldNext = self.getNext();
            self.setNext(self.getNext() + self.getStep());
            if (self.getNext() < oldNext || (stop != -1 && self.getNext() > stop)) {
                setNextProfile.enter();
                self.setNext(stop);
            }
            return item;
        }
    }

    @Builtin(name = __REDUCE__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class ReduceNode extends PythonUnaryBuiltinNode {
        @Specialization(guards = "isNone(self.getIterable())")
        Object reduceNoIterable(VirtualFrame frame, PIslice self,
                        @Cached GetClassNode getClassNode,
                        @Cached PyObjectGetIter getIter) {
            // return type(self), (iter([]), 0), 0
            Object type = getClassNode.execute(self);
            PTuple tuple = factory().createTuple(new Object[]{getIter.execute(frame, factory().createList()), 0});
            return factory().createTuple(new Object[]{type, tuple, 0});
        }

        @Specialization(guards = "!isNone(self.getIterable())")
        Object reduce(PIslice self,
                        @Cached GetClassNode getClassNode) {
            Object type = getClassNode.execute(self);
            Object stop = (self.getStop() == -1) ? PNone.NONE : self.getStop();
            PTuple tuple = factory().createTuple(new Object[]{self.getIterable(), self.getNext(), stop, self.getStep()});
            return factory().createTuple(new Object[]{type, tuple, self.getCnt()});
        }
    }

    @Builtin(name = __SETSTATE__, minNumOfPositionalArgs = 2)
    @GenerateNodeFactory
    public abstract static class SetStateNode extends PythonBinaryBuiltinNode {
        @Specialization
        Object setState(PIslice self, Object state,
                        @Cached CastToJavaIntLossyNode castInt) {
            try {
                self.setCnt(castInt.execute(state));
            } catch (CannotCastException e) {
                throw raise(ValueError, INVALID_ARGS, __SETSTATE__);
            }
            return PNone.NONE;
        }
    }

}
