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

import static com.oracle.graal.python.builtins.PythonBuiltinClassType.TypeError;
import static com.oracle.graal.python.nodes.ErrorMessages.LEN_OF_UNSIZED_OBJECT;
import static com.oracle.graal.python.nodes.SpecialAttributeNames.T___NAME__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.J___ITER__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.J___LENGTH_HINT__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.J___NEXT__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.J___REDUCE__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.J___REPR__;

import java.util.List;

import com.oracle.graal.python.builtins.Builtin;
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.objects.str.StringUtils.SimpleTruffleStringFormatNode;
import com.oracle.graal.python.builtins.objects.tuple.PTuple;
import com.oracle.graal.python.lib.PyObjectGetAttr;
import com.oracle.graal.python.lib.PyObjectReprAsObjectNode;
import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
import com.oracle.graal.python.nodes.function.builtins.PythonUnaryBuiltinNode;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.graal.python.nodes.util.CastToTruffleStringNode;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Cached.Shared;
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.strings.TruffleString;

@CoreFunctions(extendClasses = {PythonBuiltinClassType.PRepeat})
public final class RepeatBuiltins extends PythonBuiltins {

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

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

    @Builtin(name = J___NEXT__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class NextNode extends PythonUnaryBuiltinNode {
        @Specialization(guards = "self.getCnt() > 0")
        static Object nextPos(PRepeat self) {
            self.setCnt(self.getCnt() - 1);
            return self.getElement();
        }

        @SuppressWarnings("unused")
        @Specialization(guards = "self.getCnt() == 0")
        Object nextZero(PRepeat self) {
            throw raiseStopIteration();
        }

        @Specialization(guards = "self.getCnt() < 0")
        static Object nextNeg(PRepeat self) {
            return self.getElement();
        }
    }

    @Builtin(name = J___LENGTH_HINT__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class LengthHintNode extends PythonUnaryBuiltinNode {
        @Specialization(guards = "self.getCnt() >= 0")
        static Object hintPos(PRepeat self) {
            return self.getCnt();
        }

        @SuppressWarnings("unused")
        @Specialization(guards = "self.getCnt() < 0")
        Object hintNeg(PRepeat self) {
            throw raise(TypeError, LEN_OF_UNSIZED_OBJECT);
        }
    }

    @Builtin(name = J___REDUCE__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class ReduceNode extends PythonUnaryBuiltinNode {
        @Specialization(guards = "self.getCnt() >= 0")
        Object reducePos(PRepeat self,
                        @Cached GetClassNode getClass) {
            Object type = getClass.execute(self);
            PTuple tuple = factory().createTuple(new Object[]{self.getElement(), self.getCnt()});
            return factory().createTuple(new Object[]{type, tuple});
        }

        @Specialization(guards = "self.getCnt() < 0")
        Object reduceNeg(PRepeat self,
                        @Cached GetClassNode getClass) {
            Object type = getClass.execute(self);
            PTuple tuple = factory().createTuple(new Object[]{self.getElement()});
            return factory().createTuple(new Object[]{type, tuple});
        }
    }

    @Builtin(name = J___REPR__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class ReprNode extends PythonUnaryBuiltinNode {
        @Specialization(guards = "self.getCnt() >= 0")
        static TruffleString reprPos(VirtualFrame frame, PRepeat self,
                        @Shared("getClass") @Cached GetClassNode getClass,
                        @Shared("getAttr") @Cached PyObjectGetAttr getAttrNode,
                        @Shared("repr") @Cached PyObjectReprAsObjectNode reprNode,
                        @Shared("castToTruffleString") @Cached CastToTruffleStringNode castNode,
                        @Shared("formatter") @Cached SimpleTruffleStringFormatNode simpleTruffleStringFormatNode) {
            Object type = getClass.execute(self);
            return simpleTruffleStringFormatNode.format("%s(%s, %d)", castNode.execute(getAttrNode.execute(frame, type, T___NAME__)), castNode.execute(reprNode.execute(frame, self.getElement())),
                            self.getCnt());
        }

        @Specialization(guards = "self.getCnt() < 0")
        static TruffleString reprNeg(VirtualFrame frame, PRepeat self,
                        @Shared("getClass") @Cached GetClassNode getClass,
                        @Shared("getAttr") @Cached PyObjectGetAttr getAttrNode,
                        @Shared("repr") @Cached PyObjectReprAsObjectNode reprNode,
                        @Shared("castToTruffleString") @Cached CastToTruffleStringNode castNode,
                        @Shared("formatter") @Cached SimpleTruffleStringFormatNode simpleTruffleStringFormatNode) {
            Object type = getClass.execute(self);
            return simpleTruffleStringFormatNode.format("%s(%s)", castNode.execute(getAttrNode.execute(frame, type, T___NAME__)), castNode.execute(reprNode.execute(frame, self.getElement())));
        }
    }
}
