[babeltrace.git] / tests / bindings / python / bt2 / test_field_class.py

# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2019 EfficiOS Inc.
#

import unittest

import bt2
from bt2 import value as bt2_value
from bt2 import field_class as bt2_field_class
from utils import TestOutputPortMessageIterator, get_default_trace_class


def _create_stream(tc, ctx_field_classes):
    packet_context_fc = tc.create_structure_field_class()
    for name, fc in ctx_field_classes:
        packet_context_fc.append_member(name, fc)

    trace = tc()
    stream_class = tc.create_stream_class(
        packet_context_field_class=packet_context_fc, supports_packets=True
    )

    stream = trace.create_stream(stream_class)
    return stream


def _create_const_field_class(tc, field_class, value_setter_fn):
    field_name = "const field"

    class MyIter(bt2._UserMessageIterator):
        def __init__(self, config, self_port_output):
            nonlocal field_class
            nonlocal value_setter_fn
            stream = _create_stream(tc, [(field_name, field_class)])
            packet = stream.create_packet()

            value_setter_fn(packet.context_field[field_name])

            self._msgs = [
                self._create_stream_beginning_message(stream),
                self._create_packet_beginning_message(packet),
            ]

        def __next__(self):
            if len(self._msgs) == 0:
                raise StopIteration

            return self._msgs.pop(0)

    class MySrc(bt2._UserSourceComponent, message_iterator_class=MyIter):
        def __init__(self, config, params, obj):
            self._add_output_port("out", params)

    graph = bt2.Graph()
    src_comp = graph.add_component(MySrc, "my_source", None)
    msg_iter = TestOutputPortMessageIterator(graph, src_comp.output_ports["out"])

    # Ignore first message, stream beginning
    _ = next(msg_iter)
    packet_beg_msg = next(msg_iter)

    return packet_beg_msg.packet.context_field[field_name].cls


class _TestFieldClass:
    def test_create_user_attributes(self):
        fc = self._create_default_field_class(user_attributes={"salut": 23})
        self.assertEqual(fc.user_attributes, {"salut": 23})
        self.assertIs(type(fc.user_attributes), bt2_value.MapValue)

    def test_const_create_user_attributes(self):
        fc = self._create_default_const_field_class(user_attributes={"salut": 23})
        self.assertEqual(fc.user_attributes, {"salut": 23})
        self.assertIs(type(fc.user_attributes), bt2_value._MapValueConst)

    def test_create_invalid_user_attributes(self):
        with self.assertRaises(TypeError):
            self._create_default_field_class(user_attributes=object())

    def test_create_invalid_user_attributes_value_type(self):
        with self.assertRaises(TypeError):
            self._create_default_field_class(user_attributes=23)


class BoolFieldClassTestCase(_TestFieldClass, unittest.TestCase):
    @staticmethod
    def _const_value_setter(field):
        field.value = False

    def _create_default_field_class(self, **kwargs):
        tc = get_default_trace_class()
        return tc.create_bool_field_class(**kwargs)

    def _create_default_const_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        fc = tc.create_bool_field_class(*args, **kwargs)
        return _create_const_field_class(tc, fc, self._const_value_setter)

    def setUp(self):
        self._fc = self._create_default_field_class()
        self._fc_const = self._create_default_const_field_class()

    def test_create_default(self):
        self.assertIsNotNone(self._fc)
        self.assertEqual(len(self._fc.user_attributes), 0)


class BitArrayFieldClassTestCase(_TestFieldClass, unittest.TestCase):
    @staticmethod
    def _const_value_setter(field):
        field.value = []

    def _create_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        return tc.create_bit_array_field_class(*args, **kwargs)

    def _create_default_field_class(self, **kwargs):
        return self._create_field_class(17, **kwargs)

    def _create_default_const_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        fc = tc.create_bit_array_field_class(17, **kwargs)
        return _create_const_field_class(tc, fc, self._const_value_setter)

    def setUp(self):
        self._fc = self._create_default_field_class()

    def test_create_default(self):
        self.assertIsNotNone(self._fc)
        self.assertEqual(len(self._fc.user_attributes), 0)

    def test_create_length_out_of_range(self):
        with self.assertRaises(ValueError):
            self._create_field_class(65)

    def test_create_length_zero(self):
        with self.assertRaises(ValueError):
            self._create_field_class(0)

    def test_create_length_invalid_type(self):
        with self.assertRaises(TypeError):
            self._create_field_class("lel")

    def test_length_prop(self):
        self.assertEqual(self._fc.length, 17)


class _TestIntegerFieldClassProps:
    def test_create_default(self):
        fc = self._create_default_field_class()
        self.assertEqual(fc.field_value_range, 64)
        self.assertEqual(fc.preferred_display_base, bt2.IntegerDisplayBase.DECIMAL)
        self.assertEqual(len(fc.user_attributes), 0)

    def test_create_range(self):
        fc = self._create_field_class(field_value_range=35)
        self.assertEqual(fc.field_value_range, 35)

        fc = self._create_field_class(36)
        self.assertEqual(fc.field_value_range, 36)

    def test_create_invalid_range(self):
        with self.assertRaises(TypeError):
            self._create_field_class("yes")

        with self.assertRaises(TypeError):
            self._create_field_class(field_value_range="yes")

        with self.assertRaises(ValueError):
            self._create_field_class(field_value_range=-2)

        with self.assertRaises(ValueError):
            self._create_field_class(field_value_range=0)

    def test_create_base(self):
        fc = self._create_field_class(
            preferred_display_base=bt2.IntegerDisplayBase.HEXADECIMAL
        )
        self.assertEqual(fc.preferred_display_base, bt2.IntegerDisplayBase.HEXADECIMAL)

    def test_create_invalid_base_type(self):
        with self.assertRaises(TypeError):
            self._create_field_class(preferred_display_base="yes")

    def test_create_invalid_base_value(self):
        with self.assertRaises(ValueError):
            self._create_field_class(preferred_display_base=444)

    def test_create_full(self):
        fc = self._create_field_class(
            24, preferred_display_base=bt2.IntegerDisplayBase.OCTAL
        )
        self.assertEqual(fc.field_value_range, 24)
        self.assertEqual(fc.preferred_display_base, bt2.IntegerDisplayBase.OCTAL)


class SignedIntegerFieldClassTestCase(
    _TestIntegerFieldClassProps, _TestFieldClass, unittest.TestCase
):
    @staticmethod
    def _const_value_setter(field):
        field.value = -18

    def _create_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        return tc.create_signed_integer_field_class(*args, **kwargs)

    def _create_default_const_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        fc = tc.create_signed_integer_field_class(*args, **kwargs)
        return _create_const_field_class(tc, fc, self._const_value_setter)

    _create_default_field_class = _create_field_class


class UnsignedIntegerFieldClassTestCase(
    _TestIntegerFieldClassProps, _TestFieldClass, unittest.TestCase
):
    @staticmethod
    def _const_value_setter(field):
        field.value = 18

    def _create_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        return tc.create_unsigned_integer_field_class(*args, **kwargs)

    def _create_default_const_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        fc = tc.create_signed_integer_field_class(*args, **kwargs)
        return _create_const_field_class(tc, fc, self._const_value_setter)

    _create_default_field_class = _create_field_class


class SingleRealFieldClassTestCase(_TestFieldClass, unittest.TestCase):
    @staticmethod
    def _const_value_setter(field):
        field.value = -18.0

    def _create_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        return tc.create_single_precision_real_field_class(*args, **kwargs)

    def _create_default_const_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        fc = tc.create_single_precision_real_field_class(*args, **kwargs)
        return _create_const_field_class(tc, fc, self._const_value_setter)

    _create_default_field_class = _create_field_class

    def test_create_default(self):
        fc = self._create_field_class()
        self.assertEqual(len(fc.user_attributes), 0)


class DoubleRealFieldClassTestCase(_TestFieldClass, unittest.TestCase):
    @staticmethod
    def _const_value_setter(field):
        field.value = -18.0

    def _create_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        return tc.create_double_precision_real_field_class(*args, **kwargs)

    def _create_default_const_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        fc = tc.create_double_precision_real_field_class(*args, **kwargs)
        return _create_const_field_class(tc, fc, self._const_value_setter)

    _create_default_field_class = _create_field_class

    def test_create_default(self):
        fc = self._create_field_class()
        self.assertEqual(len(fc.user_attributes), 0)


# Converts an _EnumerationFieldClassMapping to a list of ranges:
#
#    [(lower0, upper0), (lower1, upper1), ...]


def enum_mapping_to_set(mapping):
    return {(x.lower, x.upper) for x in mapping.ranges}


class _EnumerationFieldClassTestCase(_TestIntegerFieldClassProps):
    def setUp(self):
        self._spec_set_up()
        self._fc = self._create_default_field_class()
        self._fc_const = self._create_default_const_field_class()

    def test_create_from_invalid_type(self):
        with self.assertRaises(TypeError):
            self._create_field_class("coucou")

    def test_add_mapping_simple(self):
        self._fc.add_mapping("hello", self._ranges1)
        mapping = self._fc["hello"]
        self.assertEqual(mapping.label, "hello")
        self.assertEqual(mapping.ranges, self._ranges1)

    def test_const_add_mapping(self):
        with self.assertRaises(AttributeError):
            self._fc_const.add_mapping("hello", self._ranges1)

    def test_add_mapping_simple_kwargs(self):
        self._fc.add_mapping(label="hello", ranges=self._ranges1)
        mapping = self._fc["hello"]
        self.assertEqual(mapping.label, "hello")
        self.assertEqual(mapping.ranges, self._ranges1)

    def test_add_mapping_invalid_name(self):
        with self.assertRaises(TypeError):
            self._fc.add_mapping(17, self._ranges1)

    def test_add_mapping_invalid_range(self):
        with self.assertRaises(TypeError):
            self._fc.add_mapping("allo", "meow")

    def test_add_mapping_dup_label(self):
        with self.assertRaises(ValueError):
            self._fc.add_mapping("a", self._ranges1)
            self._fc.add_mapping("a", self._ranges2)

    def test_add_mapping_invalid_ranges_signedness(self):
        with self.assertRaises(TypeError):
            self._fc.add_mapping("allo", self._inval_ranges)

    def test_iadd(self):
        self._fc.add_mapping("c", self._ranges1)

        self._fc += [("d", self._ranges2), ("e", self._ranges3)]

        self.assertEqual(len(self._fc), 3)
        self.assertEqual(self._fc["c"].label, "c")
        self.assertEqual(self._fc["c"].ranges, self._ranges1)
        self.assertEqual(self._fc["d"].label, "d")
        self.assertEqual(self._fc["d"].ranges, self._ranges2)
        self.assertEqual(self._fc["e"].label, "e")
        self.assertEqual(self._fc["e"].ranges, self._ranges3)

    def test_const_iadd(self):
        with self.assertRaises(TypeError):
            self._fc_const += [("d", self._ranges2), ("e", self._ranges3)]

    def test_bool_op(self):
        self.assertFalse(self._fc)
        self._fc.add_mapping("a", self._ranges1)
        self.assertTrue(self._fc)

    def test_len(self):
        self._fc.add_mapping("a", self._ranges1)
        self._fc.add_mapping("b", self._ranges2)
        self._fc.add_mapping("c", self._ranges3)
        self.assertEqual(len(self._fc), 3)

    def test_getitem(self):
        self._fc.add_mapping("a", self._ranges1)
        self._fc.add_mapping("b", self._ranges2)
        self._fc.add_mapping("c", self._ranges3)
        mapping = self._fc["a"]
        self.assertEqual(mapping.label, "a")
        self.assertEqual(mapping.ranges, self._ranges1)
        self.assertIs(type(mapping), self._MAPPING_CLASS)
        self.assertIs(type(mapping.ranges), self._CONST_RANGE_SET_CLASS)

    def test_getitem_nonexistent(self):
        with self.assertRaises(KeyError):
            self._fc["doesnotexist"]

    def test_iter(self):
        self._fc.add_mapping("a", self._ranges1)
        self._fc.add_mapping("b", self._ranges2)
        self._fc.add_mapping("c", self._ranges3)

        # This exercises iteration.
        labels = sorted(self._fc)

        self.assertEqual(labels, ["a", "b", "c"])

    def test_find_by_value(self):
        self._fc.add_mapping("a", self._ranges1)
        self._fc.add_mapping("b", self._ranges2)
        self._fc.add_mapping("c", self._ranges3)
        mappings = self._fc.mappings_for_value(self._value_in_range_1_and_3)
        labels = set([mapping.label for mapping in mappings])
        expected_labels = set(["a", "c"])
        self.assertEqual(labels, expected_labels)


class UnsignedEnumerationFieldClassTestCase(
    _EnumerationFieldClassTestCase, _TestFieldClass, unittest.TestCase
):
    _MAPPING_CLASS = bt2_field_class._UnsignedEnumerationFieldClassMappingConst
    _RANGE_SET_CLASS = bt2.UnsignedIntegerRangeSet
    _CONST_RANGE_SET_CLASS = bt2._UnsignedIntegerRangeSetConst

    def _spec_set_up(self):
        self._ranges1 = bt2.UnsignedIntegerRangeSet([(1, 4), (18, 47)])
        self._ranges2 = bt2.UnsignedIntegerRangeSet([(5, 5)])
        self._ranges3 = bt2.UnsignedIntegerRangeSet([(8, 22), (48, 99)])
        self._inval_ranges = bt2.SignedIntegerRangeSet([(-8, -5), (48, 1928)])
        self._value_in_range_1_and_3 = 20

    @staticmethod
    def _const_value_setter(field):
        field.value = 0

    def _create_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        return tc.create_unsigned_enumeration_field_class(*args, **kwargs)

    def _create_default_const_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        fc = tc.create_unsigned_enumeration_field_class(*args, **kwargs)
        return _create_const_field_class(tc, fc, self._const_value_setter)

    _create_default_field_class = _create_field_class


class SignedEnumerationFieldClassTestCase(
    _EnumerationFieldClassTestCase, _TestFieldClass, unittest.TestCase
):
    _MAPPING_CLASS = bt2_field_class._SignedEnumerationFieldClassMappingConst
    _RANGE_SET_CLASS = bt2.SignedIntegerRangeSet
    _CONST_RANGE_SET_CLASS = bt2._SignedIntegerRangeSetConst

    def _spec_set_up(self):
        self._ranges1 = bt2.SignedIntegerRangeSet([(-10, -4), (18, 47)])
        self._ranges2 = bt2.SignedIntegerRangeSet([(-3, -3)])
        self._ranges3 = bt2.SignedIntegerRangeSet([(-100, -1), (8, 16), (48, 99)])
        self._inval_ranges = bt2.UnsignedIntegerRangeSet([(8, 16), (48, 99)])
        self._value_in_range_1_and_3 = -7

    @staticmethod
    def _const_value_setter(field):
        field.value = 0

    def _create_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        return tc.create_signed_enumeration_field_class(*args, **kwargs)

    def _create_default_const_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        fc = tc.create_signed_enumeration_field_class(*args, **kwargs)
        return _create_const_field_class(tc, fc, self._const_value_setter)

    _create_default_field_class = _create_field_class


class StringFieldClassTestCase(_TestFieldClass, unittest.TestCase):
    @staticmethod
    def _const_value_setter(field):
        field.value = "chaine"

    def _create_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        return tc.create_string_field_class(*args, **kwargs)

    def _create_default_const_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        fc = tc.create_string_field_class(*args, **kwargs)
        return _create_const_field_class(tc, fc, self._const_value_setter)

    _create_default_field_class = _create_field_class

    def setUp(self):
        self._fc = self._create_default_field_class()

    def test_create_default(self):
        self.assertIsNotNone(self._fc)
        self.assertEqual(len(self._fc.user_attributes), 0)


class _TestElementContainer:
    def setUp(self):
        self._tc = get_default_trace_class()
        self._fc = self._create_default_field_class()
        self._fc_const = self._create_default_const_field_class()

    def test_create_default(self):
        self.assertIsNotNone(self._fc)
        self.assertEqual(len(self._fc.user_attributes), 0)

    def test_append_element(self):
        int_field_class = self._tc.create_signed_integer_field_class(32)
        self._append_element_method(self._fc, "int32", int_field_class)
        field_class = self._fc["int32"].field_class
        self.assertEqual(field_class.addr, int_field_class.addr)

    def test_append_element_kwargs(self):
        int_field_class = self._tc.create_signed_integer_field_class(32)
        self._append_element_method(self._fc, name="int32", field_class=int_field_class)
        field_class = self._fc["int32"].field_class
        self.assertEqual(field_class.addr, int_field_class.addr)

    def test_append_element_invalid_name(self):
        sub_fc = self._tc.create_string_field_class()

        with self.assertRaises(TypeError):
            self._append_element_method(self._fc, 23, sub_fc)

    def test_append_element_invalid_field_class(self):
        with self.assertRaises(TypeError):
            self._append_element_method(self._fc, "yes", object())

    def test_append_element_dup_name(self):
        sub_fc1 = self._tc.create_string_field_class()
        sub_fc2 = self._tc.create_string_field_class()

        with self.assertRaises(ValueError):
            self._append_element_method(self._fc, "yes", sub_fc1)
            self._append_element_method(self._fc, "yes", sub_fc2)

    def test_attr_field_class(self):
        int_field_class = self._tc.create_signed_integer_field_class(32)
        self._append_element_method(self._fc, "int32", int_field_class)
        field_class = self._fc["int32"].field_class

        self.assertIs(type(field_class), bt2_field_class._SignedIntegerFieldClass)

    def test_const_attr_field_class(self):
        int_field_class = self._tc.create_signed_integer_field_class(32)
        self._append_element_method(self._fc, "int32", int_field_class)
        field_class = self._fc["int32"].field_class
        const_fc = _create_const_field_class(
            self._tc, self._fc, self._const_value_setter
        )
        field_class = const_fc["int32"].field_class

        self.assertIs(type(field_class), bt2_field_class._SignedIntegerFieldClassConst)

    def test_iadd(self):
        a_field_class = self._tc.create_single_precision_real_field_class()
        b_field_class = self._tc.create_signed_integer_field_class(17)
        self._append_element_method(self._fc, "a_float", a_field_class)
        self._append_element_method(self._fc, "b_int", b_field_class)
        c_field_class = self._tc.create_string_field_class()
        d_field_class = self._tc.create_signed_enumeration_field_class(
            field_value_range=32
        )
        e_field_class = self._tc.create_structure_field_class()
        self._fc += [
            ("c_string", c_field_class),
            ("d_enum", d_field_class),
            ("e_struct", e_field_class),
        ]
        self.assertEqual(self._fc["a_float"].field_class.addr, a_field_class.addr)
        self.assertEqual(self._fc["a_float"].name, "a_float")
        self.assertEqual(self._fc["b_int"].field_class.addr, b_field_class.addr)
        self.assertEqual(self._fc["b_int"].name, "b_int")
        self.assertEqual(self._fc["c_string"].field_class.addr, c_field_class.addr)
        self.assertEqual(self._fc["c_string"].name, "c_string")
        self.assertEqual(self._fc["d_enum"].field_class.addr, d_field_class.addr)
        self.assertEqual(self._fc["d_enum"].name, "d_enum")
        self.assertEqual(self._fc["e_struct"].field_class.addr, e_field_class.addr)
        self.assertEqual(self._fc["e_struct"].name, "e_struct")

    def test_const_iadd(self):
        a_field_class = self._tc.create_single_precision_real_field_class()
        with self.assertRaises(TypeError):
            self._fc_const += a_field_class

    def test_bool_op(self):
        self.assertFalse(self._fc)
        self._append_element_method(self._fc, "a", self._tc.create_string_field_class())
        self.assertTrue(self._fc)

    def test_len(self):
        self._append_element_method(self._fc, "a", self._tc.create_string_field_class())
        self._append_element_method(self._fc, "b", self._tc.create_string_field_class())
        self._append_element_method(self._fc, "c", self._tc.create_string_field_class())
        self.assertEqual(len(self._fc), 3)

    def test_getitem(self):
        a_fc = self._tc.create_signed_integer_field_class(32)
        b_fc = self._tc.create_string_field_class()
        c_fc = self._tc.create_single_precision_real_field_class()
        self._append_element_method(self._fc, "a", a_fc)
        self._append_element_method(self._fc, "b", b_fc)
        self._append_element_method(self._fc, "c", c_fc)
        self.assertEqual(self._fc["b"].field_class.addr, b_fc.addr)
        self.assertEqual(self._fc["b"].name, "b")

    def test_getitem_invalid_key_type(self):
        with self.assertRaises(TypeError):
            self._fc[0]

    def test_getitem_invalid_key(self):
        with self.assertRaises(KeyError):
            self._fc["no way"]

    def test_contains(self):
        self.assertFalse("a" in self._fc)
        self._append_element_method(self._fc, "a", self._tc.create_string_field_class())
        self.assertTrue("a" in self._fc)

    def test_iter(self):
        a_fc = self._tc.create_signed_integer_field_class(32)
        b_fc = self._tc.create_string_field_class()
        c_fc = self._tc.create_single_precision_real_field_class()
        elements = (("a", a_fc), ("b", b_fc), ("c", c_fc))

        for elem in elements:
            self._append_element_method(self._fc, *elem)

        for (name, element), test_elem in zip(self._fc.items(), elements):
            self.assertEqual(element.name, test_elem[0])
            self.assertEqual(name, element.name)
            self.assertEqual(element.field_class.addr, test_elem[1].addr)
            self.assertEqual(len(element.user_attributes), 0)

    def test_at_index(self):
        a_fc = self._tc.create_signed_integer_field_class(32)
        b_fc = self._tc.create_string_field_class()
        c_fc = self._tc.create_single_precision_real_field_class()
        self._append_element_method(self._fc, "c", c_fc)
        self._append_element_method(self._fc, "a", a_fc)
        self._append_element_method(self._fc, "b", b_fc)
        elem = self._at_index_method(self._fc, 1)
        self.assertEqual(elem.field_class.addr, a_fc.addr)
        self.assertEqual(elem.name, "a")

    def test_at_index_invalid(self):
        self._append_element_method(
            self._fc, "c", self._tc.create_signed_integer_field_class(32)
        )

        with self.assertRaises(TypeError):
            self._at_index_method(self._fc, "yes")

    def test_at_index_out_of_bounds_after(self):
        self._append_element_method(
            self._fc, "c", self._tc.create_signed_integer_field_class(32)
        )

        with self.assertRaises(IndexError):
            self._at_index_method(self._fc, len(self._fc))

    def test_user_attributes(self):
        self._append_element_method(
            self._fc,
            "c",
            self._tc.create_string_field_class(),
            user_attributes={"salut": 23},
        )
        self.assertEqual(self._fc["c"].user_attributes, {"salut": 23})
        self.assertIs(type(self._fc.user_attributes), bt2_value.MapValue)
        self.assertIs(type(self._fc["c"].user_attributes), bt2_value.MapValue)

    def test_invalid_user_attributes(self):
        with self.assertRaises(TypeError):
            self._append_element_method(
                self._fc,
                "c",
                self._tc.create_string_field_class(),
                user_attributes=object(),
            )

    def test_invalid_user_attributes_value_type(self):
        with self.assertRaises(TypeError):
            self._append_element_method(
                self._fc, "c", self._tc.create_string_field_class(), user_attributes=23
            )


class StructureFieldClassTestCase(
    _TestFieldClass, _TestElementContainer, unittest.TestCase
):
    _append_element_method = staticmethod(bt2._StructureFieldClass.append_member)
    _at_index_method = staticmethod(bt2._StructureFieldClass.member_at_index)

    @staticmethod
    def _const_value_setter(field):
        field.value = {}

    def _create_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        return tc.create_structure_field_class(*args, **kwargs)

    def _create_default_const_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        fc = tc.create_structure_field_class(*args, **kwargs)
        return _create_const_field_class(tc, fc, self._const_value_setter)

    _create_default_field_class = _create_field_class

    def test_const_member_field_class(self):
        def _real_value_setter(field):
            field.value = {"real": 0}

        tc = get_default_trace_class()
        fc = tc.create_structure_field_class()
        member_fc = self._tc.create_single_precision_real_field_class()
        fc.append_member("real", member_fc)
        const_fc = _create_const_field_class(tc, fc, _real_value_setter)

        self.assertIs(
            type(const_fc["real"].field_class),
            bt2_field_class._SinglePrecisionRealFieldClassConst,
        )

    def test_member_field_class(self):
        tc = get_default_trace_class()
        fc = tc.create_structure_field_class()
        member_fc = self._tc.create_single_precision_real_field_class()
        fc.append_member("real", member_fc)

        self.assertIs(
            type(fc["real"].field_class), bt2_field_class._SinglePrecisionRealFieldClass
        )


class OptionWithoutSelectorFieldClassTestCase(_TestFieldClass, unittest.TestCase):
    @staticmethod
    def _const_value_setter(field):
        field.has_field = True
        field.value = 12

    def _create_default_field_class(self, *args, **kwargs):
        return self._tc.create_option_without_selector_field_class(
            self._content_fc, *args, **kwargs
        )

    def _create_default_const_field_class(self, *args, **kwargs):
        fc = self._tc.create_option_without_selector_field_class(
            self._content_fc, *args, **kwargs
        )
        return _create_const_field_class(self._tc, fc, self._const_value_setter)

    def setUp(self):
        self._tc = get_default_trace_class()
        self._content_fc = self._tc.create_signed_integer_field_class(23)

    def test_create_default(self):
        fc = self._create_default_field_class()
        self.assertEqual(fc.field_class.addr, self._content_fc.addr)
        self.assertEqual(len(fc.user_attributes), 0)

    def test_create_invalid_field_class(self):
        with self.assertRaises(TypeError):
            self._tc.create_option_without_selector_field_class(object())

    def test_attr_field_class(self):
        fc = self._create_default_field_class()
        self.assertIs(type(fc.field_class), bt2_field_class._SignedIntegerFieldClass)

    def test_const_attr_field_class(self):
        fc = self._create_default_const_field_class()
        self.assertIs(
            type(fc.field_class), bt2_field_class._SignedIntegerFieldClassConst
        )


class _OptionWithSelectorFieldClassTestCase(_TestFieldClass):
    @staticmethod
    def _const_value_setter(field):
        field["opt"].has_field = True
        field["opt"].value = 12

    def _create_default_const_field_class(self, *args, **kwargs):
        # Create a struct to contain the option and its selector else we can't
        # create the non-const field necessary to get the the const field_class
        struct_fc = self._tc.create_structure_field_class()
        struct_fc.append_member("selecteux", self._tag_fc)
        opt_fc = self._create_default_field_class(*args, **kwargs)
        struct_fc.append_member("opt", opt_fc)

        return _create_const_field_class(self._tc, struct_fc, self._const_value_setter)[
            "opt"
        ].field_class

    def setUp(self):
        self._tc = get_default_trace_class()
        self._content_fc = self._tc.create_signed_integer_field_class(23)
        self._tag_fc = self._create_tag_fc()

    def _create_field_class_for_field_path_test(self):
        fc = self._create_default_field_class()

        foo_fc = self._tc.create_single_precision_real_field_class()
        bar_fc = self._tc.create_string_field_class()
        baz_fc = self._tc.create_string_field_class()

        inner_struct_fc = self._tc.create_structure_field_class()
        inner_struct_fc.append_member("bar", bar_fc)
        inner_struct_fc.append_member("baz", baz_fc)
        inner_struct_fc.append_member("tag", self._tag_fc)
        inner_struct_fc.append_member("opt", fc)

        opt_struct_array_fc = self._tc.create_option_without_selector_field_class(
            inner_struct_fc
        )

        outer_struct_fc = self._tc.create_structure_field_class()
        outer_struct_fc.append_member("foo", foo_fc)
        outer_struct_fc.append_member("inner_opt", opt_struct_array_fc)

        # The path to the selector field class is resolved when the
        # option field class is actually used, for example in a packet
        # context.
        self._tc.create_stream_class(
            packet_context_field_class=outer_struct_fc, supports_packets=True
        )

        return fc

    def test_field_path_len(self):
        fc = self._create_field_class_for_field_path_test()
        self.assertEqual(len(fc.selector_field_path), 3)

    def test_field_path_iter(self):
        fc = self._create_field_class_for_field_path_test()
        path_items = list(fc.selector_field_path)

        self.assertEqual(len(path_items), 3)

        self.assertIsInstance(path_items[0], bt2._IndexFieldPathItem)
        self.assertEqual(path_items[0].index, 1)

        self.assertIsInstance(path_items[1], bt2._CurrentOptionContentFieldPathItem)

        self.assertIsInstance(path_items[2], bt2._IndexFieldPathItem)
        self.assertEqual(path_items[2].index, 2)

    def test_field_path_root_scope(self):
        fc = self._create_field_class_for_field_path_test()
        self.assertEqual(
            fc.selector_field_path.root_scope, bt2.FieldPathScope.PACKET_CONTEXT
        )


class OptionWithBoolSelectorFieldClassTestCase(
    _OptionWithSelectorFieldClassTestCase, unittest.TestCase
):
    def _create_default_field_class(self, *args, **kwargs):
        return self._tc.create_option_with_bool_selector_field_class(
            self._content_fc, self._tag_fc, *args, **kwargs
        )

    def _create_tag_fc(self):
        return self._tc.create_bool_field_class()

    def test_create_default(self):
        fc = self._create_default_field_class()
        self.assertEqual(fc.field_class.addr, self._content_fc.addr)
        self.assertFalse(fc.selector_is_reversed)
        self.assertEqual(len(fc.user_attributes), 0)

    def test_create_selector_is_reversed_wrong_type(self):
        with self.assertRaises(TypeError):
            self._create_default_field_class(selector_is_reversed=23)

    def test_create_invalid_selector_type(self):
        with self.assertRaises(TypeError):
            self._tc.create_option_with_bool_selector_field_class(self._content_fc, 17)

    def test_attr_selector_is_reversed(self):
        fc = self._create_default_field_class(selector_is_reversed=True)
        self.assertTrue(fc.selector_is_reversed)

    def test_const_attr_selector_is_reversed(self):
        fc = self._create_default_const_field_class(selector_is_reversed=True)
        self.assertTrue(fc.selector_is_reversed)


class _OptionWithIntegerSelectorFieldClassTestCase(
    _OptionWithSelectorFieldClassTestCase
):
    def _create_default_field_class(self, *args, **kwargs):
        return self._tc.create_option_with_integer_selector_field_class(
            self._content_fc, self._tag_fc, self._ranges, *args, **kwargs
        )

    def test_create_default(self):
        fc = self._create_default_field_class()
        self.assertEqual(fc.field_class.addr, self._content_fc.addr)
        self.assertEqual(fc.ranges, self._ranges)
        self.assertEqual(len(fc.user_attributes), 0)

    def test_create_ranges_wrong_type(self):
        with self.assertRaises(TypeError):
            self._tc.create_option_with_integer_selector_field_class(
                self._content_fc, self._tag_fc, 23
            )

    def test_create_ranges_empty(self):
        with self.assertRaises(ValueError):
            self._tc.create_option_with_integer_selector_field_class(
                self._content_fc, self._tag_fc, type(self._ranges)()
            )

    def test_create_invalid_selector_type(self):
        with self.assertRaises(TypeError):
            self._tc.create_option_with_bool_selector_field_class(self._content_fc, 17)

    def test_attr_ranges(self):
        fc = self._create_default_field_class()
        self.assertEqual(fc.ranges, self._ranges)

    def test_const_attr_ranges(self):
        fc = self._create_default_const_field_class()
        self.assertEqual(fc.ranges, self._ranges)


class OptionWithUnsignedIntegerSelectorFieldClassTestCase(
    _OptionWithIntegerSelectorFieldClassTestCase, unittest.TestCase
):
    def setUp(self):
        self._ranges = bt2.UnsignedIntegerRangeSet([(1, 3), (18, 44)])
        super().setUp()

    def _create_tag_fc(self):
        return self._tc.create_unsigned_integer_field_class()


class VariantFieldClassWithoutSelectorTestCase(
    _TestFieldClass, _TestElementContainer, unittest.TestCase
):
    _append_element_method = staticmethod(
        bt2._VariantFieldClassWithoutSelector.append_option
    )
    _at_index_method = staticmethod(
        bt2._VariantFieldClassWithoutSelector.option_at_index
    )

    @staticmethod
    def _const_value_setter(variant_field):
        variant_field.selected_option_index = 0
        variant_field.value = 12

    def _create_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        return tc.create_variant_field_class(*args, **kwargs)

    def _create_default_const_field_class(self, *args, **kwargs):
        tc = get_default_trace_class()
        fc = tc.create_variant_field_class(*args, **kwargs)
        int_field_class = self._tc.create_signed_integer_field_class(32)
        fc.append_option("int32", int_field_class)

        return _create_const_field_class(tc, fc, self._const_value_setter)

    _create_default_field_class = _create_field_class


class _VariantFieldClassWithIntegerSelectorTestCase:
    @staticmethod
    def _const_value_setter(field):
        field["variant"].selected_option_index = 0
        field["variant"] = 12

    def _create_default_field_class(self, *args, **kwargs):
        return self._tc.create_variant_field_class(
            *args, selector_fc=self._selector_fc, **kwargs
        )

    def _create_default_const_field_class(self, *args, **kwargs):
        # Create a struct to contain the variant and its selector else we can't
        # create the non-const field necessary to get the the const field_class
        struct_fc = self._tc.create_structure_field_class()
        struct_fc.append_member("selecteux", self._selector_fc)
        variant_fc = self._tc.create_variant_field_class(
            *args, selector_fc=self._selector_fc
        )
        variant_fc.append_option(
            "a", self._tc.create_signed_integer_field_class(32), self._ranges1
        )
        struct_fc.append_member("variant", variant_fc, **kwargs)

        return _create_const_field_class(self._tc, struct_fc, self._const_value_setter)[
            "variant"
        ].field_class

    def setUp(self):
        self._tc = get_default_trace_class()
        self._spec_set_up()
        self._fc = self._create_default_field_class()

    def test_create_default(self):
        self.assertIsNotNone(self._fc)
        self.assertEqual(len(self._fc.user_attributes), 0)

    def test_append_element(self):
        str_field_class = self._tc.create_string_field_class()
        self._fc.append_option("str", str_field_class, self._ranges1)
        opt = self._fc["str"]
        self.assertEqual(opt.field_class.addr, str_field_class.addr)
        self.assertEqual(opt.name, "str")
        self.assertEqual(opt.ranges.addr, self._ranges1.addr)

    def test_const_append(self):
        fc_const = self._create_default_const_field_class()
        str_field_class = self._tc.create_string_field_class()
        with self.assertRaises(AttributeError):
            fc_const.append_option("str", str_field_class, self._ranges1)

    def test_append_element_kwargs(self):
        int_field_class = self._tc.create_signed_integer_field_class(32)
        self._fc.append_option(
            name="int32", field_class=int_field_class, ranges=self._ranges1
        )
        opt = self._fc["int32"]
        self.assertEqual(opt.field_class.addr, int_field_class.addr)
        self.assertEqual(opt.name, "int32")
        self.assertEqual(opt.ranges.addr, self._ranges1.addr)

    def test_append_element_invalid_name(self):
        sub_fc = self._tc.create_string_field_class()

        with self.assertRaises(TypeError):
            self._fc.append_option(self._fc, 23, sub_fc)

    def test_append_element_invalid_field_class(self):
        with self.assertRaises(TypeError):
            self._fc.append_option(self._fc, "yes", object())

    def test_append_element_invalid_ranges(self):
        sub_fc = self._tc.create_string_field_class()

        with self.assertRaises(TypeError):
            self._fc.append_option(self._fc, sub_fc, "lel")

    def test_append_element_dup_name(self):
        sub_fc1 = self._tc.create_string_field_class()
        sub_fc2 = self._tc.create_string_field_class()

        with self.assertRaises(ValueError):
            self._fc.append_option("yes", sub_fc1, self._ranges1)
            self._fc.append_option("yes", sub_fc2, self._ranges2)

    def test_append_element_invalid_ranges_signedness(self):
        sub_fc = self._tc.create_string_field_class()

        with self.assertRaises(TypeError):
            self._fc.append_option(self._fc, sub_fc, self._inval_ranges)

    def test_user_attributes(self):
        self._fc.append_option(
            "c",
            self._tc.create_string_field_class(),
            self._ranges1,
            user_attributes={"salut": 23},
        )
        self.assertEqual(self._fc["c"].user_attributes, {"salut": 23})
        self.assertIs(type(self._fc.user_attributes), bt2_value.MapValue)

    def test_const_user_attributes(self):
        fc_const = self._create_default_const_field_class()
        self.assertIs(type(fc_const.user_attributes), bt2_value._MapValueConst)

    def test_invalid_user_attributes(self):
        with self.assertRaises(TypeError):
            self._fc.append_option(
                "c",
                self._tc.create_string_field_class(),
                self._ranges1,
                user_attributes=object(),
            )

    def test_invalid_user_attributes_value_type(self):
        with self.assertRaises(TypeError):
            self._fc.append_option(
                "c",
                self._tc.create_string_field_class(),
                self._ranges1,
                user_attributes=23,
            )

    def test_iadd(self):
        a_field_class = self._tc.create_single_precision_real_field_class()
        self._fc.append_option("a_float", a_field_class, self._ranges1)
        c_field_class = self._tc.create_string_field_class()
        d_field_class = self._tc.create_signed_enumeration_field_class(
            field_value_range=32
        )
        self._fc += [
            ("c_string", c_field_class, self._ranges2),
            ("d_enum", d_field_class, self._ranges3),
        ]
        self.assertEqual(self._fc["a_float"].field_class.addr, a_field_class.addr)
        self.assertEqual(self._fc["a_float"].name, "a_float")
        self.assertEqual(self._fc["a_float"].ranges, self._ranges1)
        self.assertEqual(self._fc["c_string"].field_class.addr, c_field_class.addr)
        self.assertEqual(self._fc["c_string"].name, "c_string")
        self.assertEqual(self._fc["c_string"].ranges, self._ranges2)
        self.assertEqual(self._fc["d_enum"].field_class.addr, d_field_class.addr)
        self.assertEqual(self._fc["d_enum"].name, "d_enum")
        self.assertEqual(self._fc["d_enum"].ranges, self._ranges3)

    def test_const_iadd(self):
        fc_const = self._create_default_const_field_class()
        a_field_class = self._tc.create_single_precision_real_field_class()
        with self.assertRaises(TypeError):
            fc_const += [("a_float", a_field_class, self._ranges1)]

    def test_bool_op(self):
        self.assertFalse(self._fc)
        self._fc.append_option("a", self._tc.create_string_field_class(), self._ranges1)
        self.assertTrue(self._fc)

    def test_len(self):
        self._fc.append_option("a", self._tc.create_string_field_class(), self._ranges1)
        self._fc.append_option("b", self._tc.create_string_field_class(), self._ranges2)
        self._fc.append_option("c", self._tc.create_string_field_class(), self._ranges3)
        self.assertEqual(len(self._fc), 3)

    def test_getitem(self):
        a_fc = self._tc.create_signed_integer_field_class(32)
        b_fc = self._tc.create_string_field_class()
        c_fc = self._tc.create_single_precision_real_field_class()
        self._fc.append_option("a", a_fc, self._ranges1)
        self._fc.append_option("b", b_fc, self._ranges2)
        self._fc.append_option("c", c_fc, self._ranges3)
        self.assertEqual(self._fc["b"].field_class.addr, b_fc.addr)
        self.assertEqual(self._fc["b"].name, "b")
        self.assertEqual(self._fc["b"].ranges.addr, self._ranges2.addr)

    def test_option_field_class(self):
        a_fc = self._tc.create_signed_integer_field_class(32)
        self._fc.append_option("a", a_fc, self._ranges1)
        self.assertIs(
            type(self._fc["a"].field_class), bt2_field_class._SignedIntegerFieldClass
        )

    def test_const_option_field_class(self):
        fc_const = self._create_default_const_field_class()
        self.assertIs(
            type(fc_const["a"].field_class),
            bt2_field_class._SignedIntegerFieldClassConst,
        )

    def test_getitem_invalid_key_type(self):
        with self.assertRaises(TypeError):
            self._fc[0]

    def test_getitem_invalid_key(self):
        with self.assertRaises(KeyError):
            self._fc["no way"]

    def test_contains(self):
        self.assertFalse("a" in self._fc)
        self._fc.append_option("a", self._tc.create_string_field_class(), self._ranges1)
        self.assertTrue("a" in self._fc)

    def test_iter(self):
        a_fc = self._tc.create_signed_integer_field_class(32)
        b_fc = self._tc.create_string_field_class()
        c_fc = self._tc.create_single_precision_real_field_class()
        opts = (
            ("a", a_fc, self._ranges1),
            ("b", b_fc, self._ranges2),
            ("c", c_fc, self._ranges3),
        )

        for opt in opts:
            self._fc.append_option(*opt)

        for (name, opt), test_opt in zip(self._fc.items(), opts):
            self.assertEqual(opt.name, test_opt[0])
            self.assertEqual(name, opt.name)
            self.assertEqual(opt.field_class.addr, test_opt[1].addr)
            self.assertEqual(opt.ranges.addr, test_opt[2].addr)

    def test_at_index(self):
        a_fc = self._tc.create_signed_integer_field_class(32)
        b_fc = self._tc.create_string_field_class()
        c_fc = self._tc.create_single_precision_real_field_class()
        self._fc.append_option("c", c_fc, self._ranges1)
        self._fc.append_option("a", a_fc, self._ranges2)
        self._fc.append_option("b", b_fc, self._ranges3)
        self.assertEqual(self._fc.option_at_index(1).field_class.addr, a_fc.addr)
        self.assertEqual(self._fc.option_at_index(1).name, "a")
        self.assertEqual(self._fc.option_at_index(1).ranges.addr, self._ranges2.addr)

    def test_at_index_invalid(self):
        self._fc.append_option(
            "c", self._tc.create_signed_integer_field_class(32), self._ranges3
        )

        with self.assertRaises(TypeError):
            self._fc.option_at_index("yes")

    def test_at_index_out_of_bounds_after(self):
        self._fc.append_option(
            "c", self._tc.create_signed_integer_field_class(32), self._ranges3
        )

        with self.assertRaises(IndexError):
            self._fc.option_at_index(len(self._fc))

    def _fill_default_fc_for_field_path_test(self):
        # Create something equivalent to:
        #
        # struct outer_struct_fc {
        #   real foo;
        #   struct inner_struct_fc {
        #     [u]int64_t selector;
        #     string bar;
        #     string baz;
        #     variant <selector> {
        #       real a;     // selected with self._ranges1
        #       int21_t b;  // selected with self._ranges2
        #       uint34_t c; // selected with self._ranges3
        #     } variant;
        #   } inner_struct[2];
        # };
        self._fc.append_option(
            "a", self._tc.create_single_precision_real_field_class(), self._ranges1
        )
        self._fc.append_option(
            "b", self._tc.create_signed_integer_field_class(21), self._ranges2
        )
        self._fc.append_option(
            "c", self._tc.create_unsigned_integer_field_class(34), self._ranges3
        )

        foo_fc = self._tc.create_single_precision_real_field_class()
        bar_fc = self._tc.create_string_field_class()
        baz_fc = self._tc.create_string_field_class()

        inner_struct_fc = self._tc.create_structure_field_class()
        inner_struct_fc.append_member("selector", self._selector_fc)
        inner_struct_fc.append_member("bar", bar_fc)
        inner_struct_fc.append_member("baz", baz_fc)
        inner_struct_fc.append_member("variant", self._fc)

        inner_struct_array_fc = self._tc.create_static_array_field_class(
            inner_struct_fc, 2
        )

        outer_struct_fc = self._tc.create_structure_field_class()
        outer_struct_fc.append_member("foo", foo_fc)
        outer_struct_fc.append_member("inner_struct", inner_struct_array_fc)

        # The path to the selector field is resolved when the sequence is
        # actually used, for example in a packet context.
        self._tc.create_stream_class(
            supports_packets=True, packet_context_field_class=outer_struct_fc
        )

    def test_selector_field_path_length(self):
        self._fill_default_fc_for_field_path_test()
        self.assertEqual(len(self._fc.selector_field_path), 3)

    def test_selector_field_path_iter(self):
        self._fill_default_fc_for_field_path_test()
        path_items = list(self._fc.selector_field_path)

        self.assertEqual(len(path_items), 3)

        self.assertIsInstance(path_items[0], bt2._IndexFieldPathItem)
        self.assertEqual(path_items[0].index, 1)

        self.assertIsInstance(path_items[1], bt2._CurrentArrayElementFieldPathItem)

        self.assertIsInstance(path_items[2], bt2._IndexFieldPathItem)
        self.assertEqual(path_items[2].index, 0)

    def test_selector_field_path_root_scope(self):
        self._fill_default_fc_for_field_path_test()
        self.assertEqual(
            self._fc.selector_field_path.root_scope, bt2.FieldPathScope.PACKET_CONTEXT
        )


class VariantFieldClassWithUnsignedSelectorTestCase(
    _VariantFieldClassWithIntegerSelectorTestCase, unittest.TestCase
):
    def _spec_set_up(self):
        self._ranges1 = bt2.UnsignedIntegerRangeSet([(1, 4), (18, 47)])
        self._ranges2 = bt2.UnsignedIntegerRangeSet([(5, 5)])
        self._ranges3 = bt2.UnsignedIntegerRangeSet([(8, 16), (48, 99)])
        self._inval_ranges = bt2.SignedIntegerRangeSet([(-8, 16), (48, 99)])
        self._selector_fc = self._tc.create_unsigned_integer_field_class()


class VariantFieldClassWithSignedSelectorTestCase(
    _VariantFieldClassWithIntegerSelectorTestCase, unittest.TestCase
):
    def _spec_set_up(self):
        self._ranges1 = bt2.SignedIntegerRangeSet([(-10, -4), (18, 47)])
        self._ranges2 = bt2.SignedIntegerRangeSet([(-3, -3)])
        self._ranges3 = bt2.SignedIntegerRangeSet([(8, 16), (48, 99)])
        self._inval_ranges = bt2.UnsignedIntegerRangeSet([(8, 16), (48, 99)])
        self._selector_fc = self._tc.create_signed_integer_field_class()


class _ArrayFieldClassTestCase:
    def test_attr_element_field_class(self):
        fc = self._create_array()
        self.assertIs(
            type(fc.element_field_class), bt2_field_class._SignedIntegerFieldClass
        )


class _ArrayFieldClassConstTestCase:
    def test_const_attr_element_field_class(self):
        fc = self._create_const_array()
        self.assertIs(
            type(fc.element_field_class), bt2_field_class._SignedIntegerFieldClassConst
        )


class StaticArrayFieldClassTestCase(
    _ArrayFieldClassTestCase, _ArrayFieldClassConstTestCase, unittest.TestCase
):
    @staticmethod
    def _const_value_setter(field):
        field.value = [9] * 45

    def _create_array(self):
        return self._tc.create_static_array_field_class(self._elem_fc, 45)

    def _create_const_array(self):
        fc = self._tc.create_static_array_field_class(self._elem_fc, 45)
        return _create_const_field_class(self._tc, fc, self._const_value_setter)

    def setUp(self):
        self._tc = get_default_trace_class()
        self._elem_fc = self._tc.create_signed_integer_field_class(23)

    def test_create_default(self):
        fc = self._tc.create_static_array_field_class(self._elem_fc, 45)
        self.assertEqual(fc.element_field_class.addr, self._elem_fc.addr)
        self.assertEqual(fc.length, 45)
        self.assertEqual(len(fc.user_attributes), 0)

    def test_create_invalid_elem_field_class(self):
        with self.assertRaises(TypeError):
            self._tc.create_static_array_field_class(object(), 45)

    def test_create_invalid_length(self):
        with self.assertRaises(ValueError):
            self._tc.create_static_array_field_class(
                self._tc.create_string_field_class(), -17
            )

    def test_create_invalid_length_type(self):
        with self.assertRaises(TypeError):
            self._tc.create_static_array_field_class(
                self._tc.create_string_field_class(), "the length"
            )


class DynamicArrayFieldClassTestCase(
    _ArrayFieldClassTestCase, _ArrayFieldClassConstTestCase, unittest.TestCase
):
    @staticmethod
    def _const_value_setter(field):
        field.value = []

    def _create_array(self):
        return self._tc.create_dynamic_array_field_class(self._elem_fc)

    def _create_const_array(self):
        fc = self._tc.create_dynamic_array_field_class(self._elem_fc)
        return _create_const_field_class(self._tc, fc, self._const_value_setter)

    def setUp(self):
        self._tc = get_default_trace_class()
        self._elem_fc = self._tc.create_signed_integer_field_class(23)

    def test_create_default(self):
        fc = self._tc.create_dynamic_array_field_class(self._elem_fc)
        self.assertEqual(fc.element_field_class.addr, self._elem_fc.addr)
        self.assertEqual(len(fc.user_attributes), 0)

    def test_create_invalid_field_class(self):
        with self.assertRaises(TypeError):
            self._tc.create_dynamic_array_field_class(object())


class DynamicArrayWithLengthFieldFieldClassTestCase(
    _ArrayFieldClassTestCase, unittest.TestCase
):
    @staticmethod
    def _const_value_setter(field):
        field.value = []

    def _create_array(self):
        return self._tc.create_dynamic_array_field_class(self._elem_fc, self._len_fc)

    def setUp(self):
        self._tc = get_default_trace_class()
        self._elem_fc = self._tc.create_signed_integer_field_class(23)
        self._len_fc = self._tc.create_unsigned_integer_field_class(12)

    def test_create_default(self):
        fc = self._create_array()
        self.assertEqual(fc.element_field_class.addr, self._elem_fc.addr)
        self.assertIsNone(fc.length_field_path, None)
        self.assertEqual(len(fc.user_attributes), 0)

    def _create_field_class_for_field_path_test(self):
        # Create something a field class that is equivalent to:
        #
        # struct outer_struct_fc {
        #   real foo;
        #   struct inner_struct_fc {
        #     string bar;
        #     string baz;
        #     uint12_t len;
        #     uint23_t dyn_array[len];
        #   } inner_struct[2];
        # };

        fc = self._create_array()

        foo_fc = self._tc.create_single_precision_real_field_class()
        bar_fc = self._tc.create_string_field_class()
        baz_fc = self._tc.create_string_field_class()

        inner_struct_fc = self._tc.create_structure_field_class()
        inner_struct_fc.append_member("bar", bar_fc)
        inner_struct_fc.append_member("baz", baz_fc)
        inner_struct_fc.append_member("len", self._len_fc)
        inner_struct_fc.append_member("dyn_array", fc)

        inner_struct_array_fc = self._tc.create_static_array_field_class(
            inner_struct_fc, 2
        )

        outer_struct_fc = self._tc.create_structure_field_class()
        outer_struct_fc.append_member("foo", foo_fc)
        outer_struct_fc.append_member("inner_struct", inner_struct_array_fc)

        # The path to the length field is resolved when the sequence is
        # actually used, for example in a packet context.
        self._tc.create_stream_class(
            packet_context_field_class=outer_struct_fc, supports_packets=True
        )

        return fc

    def test_field_path_len(self):
        fc = self._create_field_class_for_field_path_test()
        self.assertEqual(len(fc.length_field_path), 3)

    def test_field_path_iter(self):
        fc = self._create_field_class_for_field_path_test()
        path_items = list(fc.length_field_path)

        self.assertEqual(len(path_items), 3)

        self.assertIsInstance(path_items[0], bt2._IndexFieldPathItem)
        self.assertEqual(path_items[0].index, 1)

        self.assertIsInstance(path_items[1], bt2._CurrentArrayElementFieldPathItem)

        self.assertIsInstance(path_items[2], bt2._IndexFieldPathItem)
        self.assertEqual(path_items[2].index, 2)

    def test_field_path_root_scope(self):
        fc = self._create_field_class_for_field_path_test()
        self.assertEqual(
            fc.length_field_path.root_scope, bt2.FieldPathScope.PACKET_CONTEXT
        )

    def test_create_invalid_length_type(self):
        with self.assertRaises(TypeError):
            self._tc.create_dynamic_array_field_class(
                self._tc.create_string_field_class(), 17
            )


if __name__ == "__main__":
    unittest.main()