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package com.oracle.graal.python.nodes.builtins;

import com.oracle.graal.python.builtins.PythonBuiltinClassType;
import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.common.SequenceStorageNodes.CreateStorageFromIteratorNode;
import com.oracle.graal.python.builtins.objects.str.StringUtils;
import com.oracle.graal.python.builtins.objects.tuple.PTuple;
import com.oracle.graal.python.lib.PyObjectGetIter;
import com.oracle.graal.python.nodes.PGuards;
import com.oracle.graal.python.nodes.PNodeWithContext;
import com.oracle.graal.python.nodes.SpecialMethodNames;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.graal.python.runtime.object.PythonObjectFactory;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Fallback;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;

public abstract class TupleNodes {

    @ImportStatic({PGuards.class, SpecialMethodNames.class})
    public abstract static class ConstructTupleNode extends PNodeWithContext {
        @Child private PythonObjectFactory factory = PythonObjectFactory.create();

        public final PTuple execute(VirtualFrame frame, Object value) {
            return execute(frame, PythonBuiltinClassType.PTuple, value);
        }

        public abstract PTuple execute(VirtualFrame frame, Object cls, Object value);

        @Specialization(guards = "isNoValue(none)")
        PTuple tuple(Object cls, @SuppressWarnings("unused") PNone none) {
            return factory.createEmptyTuple(cls);
        }

        @Specialization
        PTuple tuple(Object cls, String arg) {
            return factory.createTuple(cls, StringUtils.toCharacterArray(arg));
        }

        @Specialization(guards = {"cannotBeOverridden(cls)", "cannotBeOverridden(iterable, getClassNode)"}, limit = "1")
        PTuple tuple(@SuppressWarnings("unused") Object cls, PTuple iterable,
                        @SuppressWarnings("unused") @Cached GetClassNode getClassNode) {
            return iterable;
        }

        @Specialization(guards = {"!isNoValue(iterable)", "createNewTuple(cls, iterable, getClassNode)"}, limit = "1")
        PTuple tuple(VirtualFrame frame, Object cls, Object iterable,
                        @SuppressWarnings("unused") @Cached GetClassNode getClassNode,
                        @Cached CreateStorageFromIteratorNode storageNode,
                        @Cached PyObjectGetIter getIter) {
            Object iterObj = getIter.execute(frame, iterable);
            return factory.createTuple(cls, storageNode.execute(frame, iterObj));
        }

        @Fallback
        public PTuple tuple(@SuppressWarnings("unused") Object cls, Object value) {
            CompilerDirectives.transferToInterpreter();
            throw new RuntimeException("tuple does not support iterable object " + value);
        }

        protected boolean createNewTuple(Object cls, Object iterable, GetClassNode getClassNode) {
            if (iterable instanceof PTuple) {
                return !(PGuards.cannotBeOverridden(cls) && PGuards.cannotBeOverridden(getClassNode.execute(iterable)));
            }
            return true;
        }

        public static ConstructTupleNode create() {
            return TupleNodesFactory.ConstructTupleNodeGen.create();
        }
    }
}
