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"""
Implementation of enums.
"""
import operator
from numba.core.imputils import (lower_builtin, lower_getattr,
lower_getattr_generic, lower_cast,
lower_constant, impl_ret_untracked)
from numba.core import types
@lower_builtin(operator.eq, types.EnumMember, types.EnumMember)
def enum_eq(context, builder, sig, args):
tu, tv = sig.args
u, v = args
res = context.generic_compare(builder, operator.eq,
(tu.dtype, tv.dtype), (u, v))
return impl_ret_untracked(context, builder, sig.return_type, res)
@lower_builtin(operator.is_, types.EnumMember, types.EnumMember)
def enum_is(context, builder, sig, args):
tu, tv = sig.args
u, v = args
if tu == tv:
res = context.generic_compare(builder, operator.eq,
(tu.dtype, tv.dtype), (u, v))
else:
res = context.get_constant(sig.return_type, False)
return impl_ret_untracked(context, builder, sig.return_type, res)
@lower_builtin(operator.ne, types.EnumMember, types.EnumMember)
def enum_ne(context, builder, sig, args):
tu, tv = sig.args
u, v = args
res = context.generic_compare(builder, operator.ne,
(tu.dtype, tv.dtype), (u, v))
return impl_ret_untracked(context, builder, sig.return_type, res)
@lower_getattr(types.EnumMember, 'value')
def enum_value(context, builder, ty, val):
return val
@lower_cast(types.IntEnumMember, types.Integer)
def int_enum_to_int(context, builder, fromty, toty, val):
"""
Convert an IntEnum member to its raw integer value.
"""
return context.cast(builder, val, fromty.dtype, toty)
@lower_constant(types.EnumMember)
def enum_constant(context, builder, ty, pyval):
"""
Return a LLVM constant representing enum member *pyval*.
"""
return context.get_constant_generic(builder, ty.dtype, pyval.value)
@lower_getattr_generic(types.EnumClass)
def enum_class_getattr(context, builder, ty, val, attr):
"""
Return an enum member by attribute name.
"""
member = getattr(ty.instance_class, attr)
return context.get_constant_generic(builder, ty.dtype, member.value)
@lower_builtin('static_getitem', types.EnumClass, types.StringLiteral)
def enum_class_getitem(context, builder, sig, args):
"""
Return an enum member by index name.
"""
enum_cls_typ, idx = sig.args
member = enum_cls_typ.instance_class[idx.literal_value]
return context.get_constant_generic(builder, enum_cls_typ.dtype,
member.value)
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