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 * The Universal Permissive License (UPL), Version 1.0
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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 * This license is subject to the following condition:
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 * The above copyright notice and either this complete permission notice or at a
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 * portions of the Software.
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package com.oracle.graal.python.lib;

import static com.oracle.graal.python.builtins.PythonBuiltinClassType.TypeError;
import static com.oracle.graal.python.nodes.ErrorMessages.ATTR_NAME_MUST_BE_STRING;
import static com.oracle.graal.python.nodes.ErrorMessages.P_HAS_NO_ATTRS_S_TO_ASSIGN;
import static com.oracle.graal.python.nodes.ErrorMessages.P_HAS_NO_ATTRS_S_TO_DELETE;
import static com.oracle.graal.python.nodes.ErrorMessages.P_HAS_RO_ATTRS_S_TO_ASSIGN;
import static com.oracle.graal.python.nodes.ErrorMessages.P_HAS_RO_ATTRS_S_TO_DELETE;

import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.type.SpecialMethodSlot;
import com.oracle.graal.python.nodes.PNodeWithContext;
import com.oracle.graal.python.nodes.PRaiseNode;
import com.oracle.graal.python.nodes.call.special.CallBinaryMethodNode;
import com.oracle.graal.python.nodes.call.special.CallTernaryMethodNode;
import com.oracle.graal.python.nodes.call.special.LookupSpecialMethodSlotNode;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Cached.Shared;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.strings.TruffleString;

/**
 * Equivalent PyObject_SetAttr*. Like Python, this method raises when the attribute doesn't exist.
 */
@GenerateUncached
@ImportStatic(SpecialMethodSlot.class)
public abstract class PyObjectSetAttr extends PNodeWithContext {
    public abstract void execute(Frame frame, Object receiver, Object name, Object value);

    public final void delete(Frame frame, Object receiver, Object name) {
        execute(frame, receiver, name, null);
    }

    @Specialization(guards = {"name == cachedName", "value != null"}, limit = "1")
    static void setFixedAttr(Frame frame, Object self, @SuppressWarnings("unused") TruffleString name, Object value,
                    @SuppressWarnings("unused") @Cached("name") TruffleString cachedName,
                    @Shared("getClass") @Cached GetClassNode getClass,
                    @Shared("lookup") @Cached(parameters = "SetAttr") LookupSpecialMethodSlotNode lookupSetattr,
                    @Shared("lookupGet") @Cached(parameters = "GetAttribute") LookupSpecialMethodSlotNode lookupGetattr,
                    @Shared("raise") @Cached PRaiseNode raise,
                    @Shared("call") @Cached CallTernaryMethodNode callSetattr) {
        Object type = getClass.execute(self);
        Object setattr = lookupSetattr.execute(frame, type, self);
        if (setattr == PNone.NO_VALUE) {
            if (lookupGetattr.execute(frame, type, self) == PNone.NO_VALUE) {
                throw raise.raise(TypeError, P_HAS_NO_ATTRS_S_TO_ASSIGN, self, name);
            } else {
                throw raise.raise(TypeError, P_HAS_RO_ATTRS_S_TO_ASSIGN, self, name);
            }
        }
        callSetattr.execute(frame, setattr, self, name, value);
    }

    @Specialization(guards = {"name == cachedName", "value == null"}, limit = "1")
    static void delFixedAttr(Frame frame, Object self, @SuppressWarnings("unused") TruffleString name, @SuppressWarnings("unused") Object value,
                    @SuppressWarnings("unused") @Cached("name") TruffleString cachedName,
                    @Shared("getClass") @Cached GetClassNode getClass,
                    @Shared("lookupDel") @Cached(parameters = "DelAttr") LookupSpecialMethodSlotNode lookupDelattr,
                    @Shared("lookupGet") @Cached(parameters = "GetAttribute") LookupSpecialMethodSlotNode lookupGetattr,
                    @Shared("raise") @Cached PRaiseNode raise,
                    @Shared("callDel") @Cached CallBinaryMethodNode callDelattr) {
        Object type = getClass.execute(self);
        Object delattr = lookupDelattr.execute(frame, type, self);
        if (delattr == PNone.NO_VALUE) {
            if (lookupGetattr.execute(frame, type, self) == PNone.NO_VALUE) {
                throw raise.raise(TypeError, P_HAS_NO_ATTRS_S_TO_DELETE, self, name);
            } else {
                throw raise.raise(TypeError, P_HAS_RO_ATTRS_S_TO_DELETE, self, name);
            }
        }
        callDelattr.executeObject(frame, delattr, self, name);
    }

    @Specialization(replaces = {"setFixedAttr", "delFixedAttr"})
    static void doDynamicAttr(Frame frame, Object self, TruffleString name, Object value,
                    @Shared("getClass") @Cached GetClassNode getClass,
                    @Shared("lookup") @Cached(parameters = "SetAttr") LookupSpecialMethodSlotNode lookupSetattr,
                    @Shared("lookupDel") @Cached(parameters = "DelAttr") LookupSpecialMethodSlotNode lookupDelattr,
                    @Shared("lookupGet") @Cached(parameters = "GetAttribute") LookupSpecialMethodSlotNode lookupGetattr,
                    @Shared("raise") @Cached PRaiseNode raise,
                    @Shared("call") @Cached CallTernaryMethodNode callSetattr,
                    @Shared("callDel") @Cached CallBinaryMethodNode callDelattr) {
        if (value == null) {
            delFixedAttr(frame, self, name, value, name, getClass, lookupDelattr, lookupGetattr, raise, callDelattr);
        } else {
            setFixedAttr(frame, self, name, value, name, getClass, lookupSetattr, lookupGetattr, raise, callSetattr);
        }
    }

    @Specialization(guards = "!isString(name)")
    @SuppressWarnings("unused")
    static void nameMustBeString(Object self, Object name, Object value,
                    @Shared("raise") @Cached PRaiseNode raise) {
        throw raise.raise(TypeError, ATTR_NAME_MUST_BE_STRING, name);
    }

    public static PyObjectSetAttr create() {
        return PyObjectSetAttrNodeGen.create();
    }

    public static PyObjectSetAttr getUncached() {
        return PyObjectSetAttrNodeGen.getUncached();
    }
}
