test_domain_cpp.py

"""
    test_domain_cpp
    ~~~~~~~~~~~~~~~

    Tests the C++ Domain

    :copyright: Copyright 2007-2020 by the Sphinx team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import re

import pytest

import sphinx.domains.cpp as cppDomain
from sphinx import addnodes
from sphinx.addnodes import desc
from sphinx.domains.cpp import DefinitionParser, DefinitionError, NoOldIdError
from sphinx.domains.cpp import Symbol, _max_id, _id_prefix
from sphinx.testing import restructuredtext
from sphinx.testing.util import assert_node
from sphinx.util import docutils


def parse(name, string):
    class Config:
        cpp_id_attributes = ["id_attr"]
        cpp_paren_attributes = ["paren_attr"]
    parser = DefinitionParser(string, location=None, config=Config())
    parser.allowFallbackExpressionParsing = False
    ast = parser.parse_declaration(name, name)
    parser.assert_end()
    # The scopedness would usually have been set by CPPEnumObject
    if name == "enum":
        ast.scoped = None  # simulate unscoped enum
    return ast


def _check(name, input, idDict, output, key, asTextOutput):
    if key is None:
        key = name
    key += ' '
    if name in ('function', 'member'):
        inputActual = input
        outputAst = output
        outputAsText = output
    else:
        inputActual = input.format(key='')
        outputAst = output.format(key='')
        outputAsText = output.format(key=key)
    if asTextOutput is not None:
        outputAsText = asTextOutput

    # first a simple check of the AST
    ast = parse(name, inputActual)
    res = str(ast)
    if res != outputAst:
        print("")
        print("Input:    ", input)
        print("Result:   ", res)
        print("Expected: ", outputAst)
        raise DefinitionError("")
    rootSymbol = Symbol(None, None, None, None, None, None)
    symbol = rootSymbol.add_declaration(ast, docname="TestDoc")
    parentNode = addnodes.desc()
    signode = addnodes.desc_signature(input, '')
    parentNode += signode
    ast.describe_signature(signode, 'lastIsName', symbol, options={})
    resAsText = parentNode.astext()
    if resAsText != outputAsText:
        print("")
        print("Input:    ", input)
        print("astext(): ", resAsText)
        print("Expected: ", outputAsText)
        raise DefinitionError("")

    idExpected = [None]
    for i in range(1, _max_id + 1):
        if i in idDict:
            idExpected.append(idDict[i])
        else:
            idExpected.append(idExpected[i - 1])
    idActual = [None]
    for i in range(1, _max_id + 1):
        try:
            id = ast.get_id(version=i)
            assert id is not None
            idActual.append(id[len(_id_prefix[i]):])
        except NoOldIdError:
            idActual.append(None)

    res = [True]
    for i in range(1, _max_id + 1):
        res.append(idExpected[i] == idActual[i])

    if not all(res):
        print("input:    %s" % input.rjust(20))
        for i in range(1, _max_id + 1):
            if res[i]:
                continue
            print("Error in id version %d." % i)
            print("result:   %s" % idActual[i])
            print("expected: %s" % idExpected[i])
        print(rootSymbol.dump(0))
        raise DefinitionError("")


def check(name, input, idDict, output=None, key=None, asTextOutput=None):
    if output is None:
        output = input
    # First, check without semicolon
    _check(name, input, idDict, output, key, asTextOutput)
    # Second, check with semicolon
    _check(name, input + ' ;', idDict, output + ';', key,
           asTextOutput + ';' if asTextOutput is not None else None)


def test_fundamental_types():
    # see https://en.cppreference.com/w/cpp/language/types
    for t, id_v2 in cppDomain._id_fundamental_v2.items():
        def makeIdV1():
            if t == 'decltype(auto)':
                return None
            id = t.replace(" ", "-").replace("long", "l").replace("int", "i")
            id = id.replace("bool", "b").replace("char", "c")
            id = id.replace("wc_t", "wchar_t").replace("c16_t", "char16_t")
            id = id.replace("c32_t", "char32_t")
            return "f__%s" % id

        def makeIdV2():
            id = id_v2
            if t == "std::nullptr_t":
                id = "NSt9nullptr_tE"
            return "1f%s" % id
        check("function", "void f(%s arg)" % t, {1: makeIdV1(), 2: makeIdV2()})


def test_expressions():
    def exprCheck(expr, id, id4=None):
        ids = 'IE1CIA%s_1aE'
        # call .format() on the expr to unescape double curly braces
        idDict = {2: ids % expr.format(), 3: ids % id}
        if id4 is not None:
            idDict[4] = ids % id4
        check('class', 'template<> {key}C<a[%s]>' % expr, idDict)

        class Config:
            cpp_id_attributes = ["id_attr"]
            cpp_paren_attributes = ["paren_attr"]

        parser = DefinitionParser(expr, location=None,
                                  config=Config())
        parser.allowFallbackExpressionParsing = False
        ast = parser.parse_expression()
        res = str(ast)
        if res != expr:
            print("")
            print("Input:    ", expr)
            print("Result:   ", res)
            raise DefinitionError("")
        displayString = ast.get_display_string()
        if res != displayString:
            # note: if the expression contains an anon name then this will trigger a falsely
            print("")
            print("Input:    ", expr)
            print("Result:   ", res)
            print("Display:  ", displayString)
            raise DefinitionError("")

    # primary
    exprCheck('nullptr', 'LDnE')
    exprCheck('true', 'L1E')
    exprCheck('false', 'L0E')
    ints = ['5', '0', '075', '0x0123456789ABCDEF', '0XF', '0b1', '0B1']
    unsignedSuffix = ['', 'u', 'U']
    longSuffix = ['', 'l', 'L', 'll', 'LL']
    for i in ints:
        for u in unsignedSuffix:
            for l in longSuffix:
                expr = i + u + l
                exprCheck(expr, 'L' + expr + 'E')
                expr = i + l + u
                exprCheck(expr, 'L' + expr + 'E')
    decimalFloats = ['5e42', '5e+42', '5e-42',
                  '5.', '5.e42', '5.e+42', '5.e-42',
                  '.5', '.5e42', '.5e+42', '.5e-42',
                  '5.0', '5.0e42', '5.0e+42', '5.0e-42']
    hexFloats = ['ApF', 'Ap+F', 'Ap-F',
                 'A.', 'A.pF', 'A.p+F', 'A.p-F',
                 '.A', '.ApF', '.Ap+F', '.Ap-F',
                 'A.B', 'A.BpF', 'A.Bp+F', 'A.Bp-F']
    for suffix in ['', 'f', 'F', 'l', 'L']:
        for e in decimalFloats:
            expr = e + suffix
            exprCheck(expr, 'L' + expr + 'E')
        for e in hexFloats:
            expr = "0x" + e + suffix
            exprCheck(expr, 'L' + expr + 'E')
    exprCheck('"abc\\"cba"', 'LA8_KcE')  # string
    exprCheck('this', 'fpT')
    # character literals
    charPrefixAndIds = [('', 'c'), ('u8', 'c'), ('u', 'Ds'), ('U', 'Di'), ('L', 'w')]
    chars = [('a', '97'), ('\\n', '10'), ('\\012', '10'), ('\\0', '0'),
             ('\\x0a', '10'), ('\\x0A', '10'), ('\\u0a42', '2626'), ('\\u0A42', '2626'),
             ('\\U0001f34c', '127820'), ('\\U0001F34C', '127820')]
    for p, t in charPrefixAndIds:
        for c, val in chars:
            exprCheck("{}'{}'".format(p, c), t + val)
    # user-defined literals
    for i in ints:
        exprCheck(i + '_udl', 'clL_Zli4_udlEL' + i + 'EE')
        exprCheck(i + 'uludl', 'clL_Zli5uludlEL' + i + 'EE')
    for f in decimalFloats:
        exprCheck(f + '_udl', 'clL_Zli4_udlEL' + f + 'EE')
        exprCheck(f + 'fudl', 'clL_Zli4fudlEL' + f + 'EE')
    for f in hexFloats:
        exprCheck('0x' + f + '_udl', 'clL_Zli4_udlEL0x' + f + 'EE')
    for p, t in charPrefixAndIds:
        for c, val in chars:
            exprCheck("{}'{}'_udl".format(p, c), 'clL_Zli4_udlE' + t + val + 'E')
    exprCheck('"abc"_udl', 'clL_Zli4_udlELA3_KcEE')
    # from issue #7294
    exprCheck('6.62607015e-34q_J', 'clL_Zli3q_JEL6.62607015e-34EE')

    # fold expressions, paren, name
    exprCheck('(... + Ns)', '(... + Ns)', id4='flpl2Ns')
    exprCheck('(Ns + ...)', '(Ns + ...)', id4='frpl2Ns')
    exprCheck('(Ns + ... + 0)', '(Ns + ... + 0)', id4='fLpl2NsL0E')
    exprCheck('(5)', 'L5E')
    exprCheck('C', '1C')
    # postfix
    exprCheck('A(2)', 'cl1AL2EE')
    exprCheck('A[2]', 'ix1AL2E')
    exprCheck('a.b.c', 'dtdt1a1b1c')
    exprCheck('a->b->c', 'ptpt1a1b1c')
    exprCheck('i++', 'pp1i')
    exprCheck('i--', 'mm1i')
    exprCheck('dynamic_cast<T&>(i)++', 'ppdcR1T1i')
    exprCheck('static_cast<T&>(i)++', 'ppscR1T1i')
    exprCheck('reinterpret_cast<T&>(i)++', 'pprcR1T1i')
    exprCheck('const_cast<T&>(i)++', 'ppccR1T1i')
    exprCheck('typeid(T).name', 'dtti1T4name')
    exprCheck('typeid(a + b).name', 'dttepl1a1b4name')
    # unary
    exprCheck('++5', 'pp_L5E')
    exprCheck('--5', 'mm_L5E')
    exprCheck('*5', 'deL5E')
    exprCheck('&5', 'adL5E')
    exprCheck('+5', 'psL5E')
    exprCheck('-5', 'ngL5E')
    exprCheck('!5', 'ntL5E')
    exprCheck('not 5', 'ntL5E')
    exprCheck('~5', 'coL5E')
    exprCheck('compl 5', 'coL5E')
    exprCheck('sizeof...(a)', 'sZ1a')
    exprCheck('sizeof(T)', 'st1T')
    exprCheck('sizeof -42', 'szngL42E')
    exprCheck('alignof(T)', 'at1T')
    exprCheck('noexcept(-42)', 'nxngL42E')
    # new-expression
    exprCheck('new int', 'nw_iE')
    exprCheck('new volatile int', 'nw_ViE')
    exprCheck('new int[42]', 'nw_AL42E_iE')
    exprCheck('new int()', 'nw_ipiE')
    exprCheck('new int(5, 42)', 'nw_ipiL5EL42EE')
    exprCheck('::new int', 'nw_iE')
    exprCheck('new int{{}}', 'nw_iilE')
    exprCheck('new int{{5, 42}}', 'nw_iilL5EL42EE')
    # delete-expression
    exprCheck('delete p', 'dl1p')
    exprCheck('delete [] p', 'da1p')
    exprCheck('::delete p', 'dl1p')
    exprCheck('::delete [] p', 'da1p')
    # cast
    exprCheck('(int)2', 'cviL2E')
    # binary op
    exprCheck('5 || 42', 'ooL5EL42E')
    exprCheck('5 or 42', 'ooL5EL42E')
    exprCheck('5 && 42', 'aaL5EL42E')
    exprCheck('5 and 42', 'aaL5EL42E')
    exprCheck('5 | 42', 'orL5EL42E')
    exprCheck('5 bitor 42', 'orL5EL42E')
    exprCheck('5 ^ 42', 'eoL5EL42E')
    exprCheck('5 xor 42', 'eoL5EL42E')
    exprCheck('5 & 42', 'anL5EL42E')
    exprCheck('5 bitand 42', 'anL5EL42E')
    # ['==', '!=']
    exprCheck('5 == 42', 'eqL5EL42E')
    exprCheck('5 != 42', 'neL5EL42E')
    exprCheck('5 not_eq 42', 'neL5EL42E')
    # ['<=', '>=', '<', '>']
    exprCheck('5 <= 42', 'leL5EL42E')
    exprCheck('A <= 42', 'le1AL42E')
    exprCheck('5 >= 42', 'geL5EL42E')
    exprCheck('5 < 42', 'ltL5EL42E')
    exprCheck('A < 42', 'lt1AL42E')
    exprCheck('5 > 42', 'gtL5EL42E')
    # ['<<', '>>']
    exprCheck('5 << 42', 'lsL5EL42E')
    exprCheck('A << 42', 'ls1AL42E')
    exprCheck('5 >> 42', 'rsL5EL42E')
    # ['+', '-']
    exprCheck('5 + 42', 'plL5EL42E')
    exprCheck('5 - 42', 'miL5EL42E')
    # ['*', '/', '%']
    exprCheck('5 * 42', 'mlL5EL42E')
    exprCheck('5 / 42', 'dvL5EL42E')
    exprCheck('5 % 42', 'rmL5EL42E')
    # ['.*', '->*']
    exprCheck('5 .* 42', 'dsL5EL42E')
    exprCheck('5 ->* 42', 'pmL5EL42E')
    # conditional
    # TODO
    # assignment
    exprCheck('a = 5', 'aS1aL5E')
    exprCheck('a *= 5', 'mL1aL5E')
    exprCheck('a /= 5', 'dV1aL5E')
    exprCheck('a %= 5', 'rM1aL5E')
    exprCheck('a += 5', 'pL1aL5E')
    exprCheck('a -= 5', 'mI1aL5E')
    exprCheck('a >>= 5', 'rS1aL5E')
    exprCheck('a <<= 5', 'lS1aL5E')
    exprCheck('a &= 5', 'aN1aL5E')
    exprCheck('a and_eq 5', 'aN1aL5E')
    exprCheck('a ^= 5', 'eO1aL5E')
    exprCheck('a xor_eq 5', 'eO1aL5E')
    exprCheck('a |= 5', 'oR1aL5E')
    exprCheck('a or_eq 5', 'oR1aL5E')
    exprCheck('a = {{1, 2, 3}}', 'aS1ailL1EL2EL3EE')
    # comma operator
    exprCheck('a, 5', 'cm1aL5E')

    # Additional tests
    # a < expression that starts with something that could be a template
    exprCheck('A < 42', 'lt1AL42E')
    check('function', 'template<> void f(A<B, 2> &v)',
          {2: "IE1fR1AI1BX2EE", 3: "IE1fR1AI1BXL2EEE", 4: "IE1fvR1AI1BXL2EEE"})
    exprCheck('A<1>::value', 'N1AIXL1EEE5valueE')
    check('class', "template<int T = 42> {key}A", {2: "I_iE1A"})
    check('enumerator', '{key}A = std::numeric_limits<unsigned long>::max()', {2: "1A"})

    exprCheck('operator()()', 'clclE')
    exprCheck('operator()<int>()', 'clclIiEE')

    # pack expansion
    exprCheck('a(b(c, 1 + d...)..., e(f..., g))', 'cl1aspcl1b1cspplL1E1dEcl1esp1f1gEE')


def test_type_definitions():
    check("type", "public bool b", {1: "b", 2: "1b"}, "{key}bool b", key='typedef')
    check("type", "{key}bool A::b", {1: "A::b", 2: "N1A1bE"}, key='typedef')
    check("type", "{key}bool *b", {1: "b", 2: "1b"}, key='typedef')
    check("type", "{key}bool *const b", {1: "b", 2: "1b"}, key='typedef')
    check("type", "{key}bool *volatile const b", {1: "b", 2: "1b"}, key='typedef')
    check("type", "{key}bool *volatile const b", {1: "b", 2: "1b"}, key='typedef')
    check("type", "{key}bool *volatile const *b", {1: "b", 2: "1b"}, key='typedef')
    check("type", "{key}bool &b", {1: "b", 2: "1b"}, key='typedef')
    check("type", "{key}bool b[]", {1: "b", 2: "1b"}, key='typedef')
    check("type", "{key}std::pair<int, int> coord", {1: "coord", 2: "5coord"}, key='typedef')
    check("type", "{key}long long int foo", {1: "foo", 2: "3foo"}, key='typedef')
    check("type", '{key}std::vector<std::pair<std::string, long long>> module::blah',
          {1: "module::blah", 2: "N6module4blahE"}, key='typedef')
    check("type", "{key}std::function<void()> F", {1: "F", 2: "1F"}, key='typedef')
    check("type", "{key}std::function<R(A1, A2)> F", {1: "F", 2: "1F"}, key='typedef')
    check("type", "{key}std::function<R(A1, A2, A3)> F", {1: "F", 2: "1F"}, key='typedef')
    check("type", "{key}std::function<R(A1, A2, A3, As...)> F", {1: "F", 2: "1F"}, key='typedef')
    check("type", "{key}MyContainer::const_iterator",
          {1: "MyContainer::const_iterator", 2: "N11MyContainer14const_iteratorE"})
    check("type",
          "public MyContainer::const_iterator",
          {1: "MyContainer::const_iterator", 2: "N11MyContainer14const_iteratorE"},
          output="{key}MyContainer::const_iterator")
    # test decl specs on right
    check("type", "{key}bool const b", {1: "b", 2: "1b"}, key='typedef')
    # test name in global scope
    check("type", "{key}bool ::B::b", {1: "B::b", 2: "N1B1bE"}, key='typedef')

    check('type', '{key}A = B', {2: '1A'}, key='using')
    check('type', '{key}A = decltype(b)', {2: '1A'}, key='using')

    # from breathe#267 (named function parameters for function pointers
    check('type', '{key}void (*gpio_callback_t)(struct device *port, uint32_t pin)',
          {1: 'gpio_callback_t', 2: '15gpio_callback_t'}, key='typedef')
    check('type', '{key}void (*f)(std::function<void(int i)> g)', {1: 'f', 2: '1f'},
          key='typedef')

    check('type', '{key}T = A::template B<int>::template C<double>', {2: '1T'}, key='using')

    check('type', '{key}T = Q<A::operator()>', {2: '1T'}, key='using')
    check('type', '{key}T = Q<A::operator()<int>>', {2: '1T'}, key='using')
    check('type', '{key}T = Q<A::operator bool>', {2: '1T'}, key='using')


def test_concept_definitions():
    check('concept', 'template<typename Param> {key}A::B::Concept',
          {2: 'I0EN1A1B7ConceptE'})
    check('concept', 'template<typename A, typename B, typename ...C> {key}Foo',
          {2: 'I00DpE3Foo'})
    with pytest.raises(DefinitionError):
        parse('concept', '{key}Foo')
    with pytest.raises(DefinitionError):
        parse('concept', 'template<typename T> template<typename U> {key}Foo')


def test_member_definitions():
    check('member', '  const  std::string  &  name = 42',
          {1: "name__ssCR", 2: "4name"}, output='const std::string &name = 42')
    check('member', '  const  std::string  &  name', {1: "name__ssCR", 2: "4name"},
          output='const std::string &name')
    check('member', '  const  std::string  &  name [ n ]',
          {1: "name__ssCRA", 2: "4name"}, output='const std::string &name[n]')
    check('member', 'const std::vector< unsigned int, long> &name',
          {1: "name__std::vector:unsigned-i.l:CR", 2: "4name"},
          output='const std::vector<unsigned int, long> &name')
    check('member', 'module::myclass foo[n]', {1: "foo__module::myclassA", 2: "3foo"})
    check('member', 'int *const p', {1: 'p__iPC', 2: '1p'})
    check('member', 'extern int myInt', {1: 'myInt__i', 2: '5myInt'})
    check('member', 'thread_local int myInt', {1: 'myInt__i', 2: '5myInt'})
    check('member', 'extern thread_local int myInt', {1: 'myInt__i', 2: '5myInt'})
    check('member', 'thread_local extern int myInt', {1: 'myInt__i', 2: '5myInt'},
          'extern thread_local int myInt')

    # tests based on https://en.cppreference.com/w/cpp/language/bit_field
    check('member', 'int b : 3', {1: 'b__i', 2: '1b'})
    check('member', 'int b : 8 = 42', {1: 'b__i', 2: '1b'})
    check('member', 'int b : 8{42}', {1: 'b__i', 2: '1b'})
    # TODO: enable once the ternary operator is supported
    #check('member', 'int b : true ? 8 : a = 42', {1: 'b__i', 2: '1b'})
    # TODO: enable once the ternary operator is supported
    #check('member', 'int b : (true ? 8 : a) = 42', {1: 'b__i', 2: '1b'})
    check('member', 'int b : 1 || new int{0}', {1: 'b__i', 2: '1b'})


def test_function_definitions():
    check('function', 'void f(volatile int)', {1: "f__iV", 2: "1fVi"})
    check('function', 'void f(std::size_t)', {1: "f__std::s", 2: "1fNSt6size_tE"})
    check('function', 'operator bool() const', {1: "castto-b-operatorC", 2: "NKcvbEv"})
    check('function', 'A::operator bool() const',
          {1: "A::castto-b-operatorC", 2: "NK1AcvbEv"})
    check('function', 'A::operator bool() volatile const &',
          {1: "A::castto-b-operatorVCR", 2: "NVKR1AcvbEv"})
    check('function', 'A::operator bool() volatile const &&',
          {1: "A::castto-b-operatorVCO", 2: "NVKO1AcvbEv"})
    check('function', 'bool namespaced::theclass::method(arg1, arg2)',
          {1: "namespaced::theclass::method__arg1.arg2",
           2: "N10namespaced8theclass6methodE4arg14arg2"})
    x = 'std::vector<std::pair<std::string, int>> &module::test(register int ' \
        'foo, bar, std::string baz = "foobar, blah, bleh") const = 0'
    check('function', x, {1: "module::test__i.bar.ssC",
                          2: "NK6module4testEi3barNSt6stringE"})
    check('function', 'void f(std::pair<A, B>)',
          {1: "f__std::pair:A.B:", 2: "1fNSt4pairI1A1BEE"})
    check('function', 'explicit module::myclass::foo::foo()',
          {1: "module::myclass::foo::foo", 2: "N6module7myclass3foo3fooEv"})
    check('function', 'module::myclass::foo::~foo()',
          {1: "module::myclass::foo::~foo", 2: "N6module7myclass3fooD0Ev"})
    check('function', 'int printf(const char *fmt, ...)',
          {1: "printf__cCP.z", 2: "6printfPKcz"})
    check('function', 'int foo(const unsigned int j)',
          {1: "foo__unsigned-iC", 2: "3fooKj"})
    check('function', 'int foo(const int *const ptr)',
          {1: "foo__iCPC", 2: "3fooPCKi"})
    check('function', 'module::myclass::operator std::vector<std::string>()',
          {1: "module::myclass::castto-std::vector:ss:-operator",
           2: "N6module7myclasscvNSt6vectorINSt6stringEEEEv"})
    check('function',
          'void operator()(const boost::array<VertexID, 2> &v) const',
          {1: "call-operator__boost::array:VertexID.2:CRC",
           2: "NKclERKN5boost5arrayI8VertexIDX2EEE",
           3: "NKclERKN5boost5arrayI8VertexIDXL2EEEE"})
    check('function',
          'void operator()(const boost::array<VertexID, 2, "foo,  bar"> &v) const',
          {1: 'call-operator__boost::array:VertexID.2."foo,--bar":CRC',
           2: 'NKclERKN5boost5arrayI8VertexIDX2EX"foo,  bar"EEE',
           3: 'NKclERKN5boost5arrayI8VertexIDXL2EEXLA9_KcEEEE'})
    check('function', 'MyClass::MyClass(MyClass::MyClass&&)',
          {1: "MyClass::MyClass__MyClass::MyClassRR",
           2: "N7MyClass7MyClassERRN7MyClass7MyClassE"})
    check('function', 'constexpr int get_value()', {1: "get_valueCE", 2: "9get_valuev"})
    check('function', 'static constexpr int get_value()',
          {1: "get_valueCE", 2: "9get_valuev"})
    check('function', 'int get_value() const noexcept',
          {1: "get_valueC", 2: "NK9get_valueEv"})
    check('function', 'int get_value() const noexcept(std::is_nothrow_move_constructible<T>::value)',
          {1: "get_valueC", 2: "NK9get_valueEv"})
    check('function', 'int get_value() const noexcept("see below")',
          {1: "get_valueC", 2: "NK9get_valueEv"})
    check('function', 'int get_value() const noexcept = delete',
          {1: "get_valueC", 2: "NK9get_valueEv"})
    check('function', 'int get_value() volatile const',
          {1: "get_valueVC", 2: "NVK9get_valueEv"})
    check('function', 'MyClass::MyClass(MyClass::MyClass&&) = default',
          {1: "MyClass::MyClass__MyClass::MyClassRR",
           2: "N7MyClass7MyClassERRN7MyClass7MyClassE"})
    check('function', 'virtual MyClass::a_virtual_function() const override',
          {1: "MyClass::a_virtual_functionC", 2: "NK7MyClass18a_virtual_functionEv"})
    check('function', 'A B() override', {1: "B", 2: "1Bv"})
    check('function', 'A B() final', {1: "B", 2: "1Bv"})
    check('function', 'A B() final override', {1: "B", 2: "1Bv"})
    check('function', 'A B() override final', {1: "B", 2: "1Bv"},
          output='A B() final override')
    check('function', 'MyClass::a_member_function() volatile',
          {1: "MyClass::a_member_functionV", 2: "NV7MyClass17a_member_functionEv"})
    check('function', 'MyClass::a_member_function() volatile const',
          {1: "MyClass::a_member_functionVC", 2: "NVK7MyClass17a_member_functionEv"})
    check('function', 'MyClass::a_member_function() &&',
          {1: "MyClass::a_member_functionO", 2: "NO7MyClass17a_member_functionEv"})
    check('function', 'MyClass::a_member_function() &',
          {1: "MyClass::a_member_functionR", 2: "NR7MyClass17a_member_functionEv"})
    check('function', 'MyClass::a_member_function() const &',
          {1: "MyClass::a_member_functionCR", 2: "NKR7MyClass17a_member_functionEv"})
    check('function', 'int main(int argc, char *argv[])',
          {1: "main__i.cPA", 2: "4mainiA_Pc"})
    check('function', 'MyClass &MyClass::operator++()',
          {1: "MyClass::inc-operator", 2: "N7MyClassppEv"})
    check('function', 'MyClass::pointer MyClass::operator->()',
          {1: "MyClass::pointer-operator", 2: "N7MyClassptEv"})

    x = 'std::vector<std::pair<std::string, int>> &module::test(register int ' \
        'foo, bar[n], std::string baz = "foobar, blah, bleh") const = 0'
    check('function', x, {1: "module::test__i.barA.ssC",
                          2: "NK6module4testEiAn_3barNSt6stringE",
                          3: "NK6module4testEiA1n_3barNSt6stringE"})
    check('function',
          'int foo(Foo f = Foo(double(), std::make_pair(int(2), double(3.4))))',
          {1: "foo__Foo", 2: "3foo3Foo"})
    check('function', 'int foo(A a = x(a))', {1: "foo__A", 2: "3foo1A"})
    with pytest.raises(DefinitionError):
        parse('function', 'int foo(B b=x(a)')
    with pytest.raises(DefinitionError):
        parse('function', 'int foo)C c=x(a))')
    with pytest.raises(DefinitionError):
        parse('function', 'int foo(D d=x(a')
    check('function', 'int foo(const A&... a)', {1: "foo__ACRDp", 2: "3fooDpRK1A"})
    check('function', 'int foo(const A&...)', {1: "foo__ACRDp", 2: "3fooDpRK1A"})
    check('function', 'int foo(const A*... a)', {1: "foo__ACPDp", 2: "3fooDpPK1A"})
    check('function', 'int foo(const A*...)', {1: "foo__ACPDp", 2: "3fooDpPK1A"})
    check('function', 'int foo(const int A::*... a)', {2: "3fooDpM1AKi"})
    check('function', 'int foo(const int A::*...)', {2: "3fooDpM1AKi"})
    #check('function', 'int foo(int (*a)(A)...)', {1: "foo__ACRDp", 2: "3fooDpPK1A"})
    #check('function', 'int foo(int (*)(A)...)', {1: "foo__ACRDp", 2: "3fooDpPK1A"})
    check('function', 'virtual void f()', {1: "f", 2: "1fv"})
    # test for ::nestedName, from issue 1738
    check("function", "result(int val, ::std::error_category const &cat)",
          {1: "result__i.std::error_categoryCR", 2: "6resultiRKNSt14error_categoryE"})
    check("function", "int *f()", {1: "f", 2: "1fv"})
    # tests derived from issue #1753 (skip to keep sanity)
    check("function", "f(int (&array)[10])", {2: "1fRA10_i", 3: "1fRAL10E_i"})
    check("function", "void f(int (&array)[10])", {2: "1fRA10_i", 3: "1fRAL10E_i"})
    check("function", "void f(float *q(double))", {2: "1fFPfdE"})
    check("function", "void f(float *(*q)(double))", {2: "1fPFPfdE"})
    check("function", "void f(float (*q)(double))", {2: "1fPFfdE"})
    check("function", "int (*f(double d))(float)", {1: "f__double", 2: "1fd"})
    check("function", "int (*f(bool b))[5]", {1: "f__b", 2: "1fb"})
    check("function", "int (*A::f(double d) const)(float)",
          {1: "A::f__doubleC", 2: "NK1A1fEd"})
    check("function", "void f(std::shared_ptr<int(double)> ptr)",
          {2: "1fNSt10shared_ptrIFidEEE"})
    check("function", "void f(int *const p)", {1: "f__iPC", 2: "1fPCi"})
    check("function", "void f(int *volatile const p)", {1: "f__iPVC", 2: "1fPVCi"})

    check('function', 'extern int f()', {1: 'f', 2: '1fv'})

    check('function', 'decltype(auto) f()', {1: 'f', 2: "1fv"})

    # TODO: make tests for functions in a template, e.g., Test<int&&()>
    # such that the id generation for function type types is correct.

    check('function', 'friend std::ostream &f(std::ostream &s, int i)',
          {1: 'f__osR.i', 2: '1fRNSt7ostreamEi'})

    # from breathe#223
    check('function', 'void f(struct E e)', {1: 'f__E', 2: '1f1E'})
    check('function', 'void f(class E e)', {1: 'f__E', 2: '1f1E'})
    check('function', 'void f(typename E e)', {1: 'f__E', 2: '1f1E'})
    check('function', 'void f(enum E e)', {1: 'f__E', 2: '1f1E'})
    check('function', 'void f(union E e)', {1: 'f__E', 2: '1f1E'})

    # pointer to member (function)
    check('function', 'void f(int C::*)', {2: '1fM1Ci'})
    check('function', 'void f(int C::* p)', {2: '1fM1Ci'})
    check('function', 'void f(int ::C::* p)', {2: '1fM1Ci'})
    check('function', 'void f(int C::*const)', {2: '1fKM1Ci'})
    check('function', 'void f(int C::*const&)', {2: '1fRKM1Ci'})
    check('function', 'void f(int C::*volatile)', {2: '1fVM1Ci'})
    check('function', 'void f(int C::*const volatile)', {2: '1fVKM1Ci'},
          output='void f(int C::*volatile const)')
    check('function', 'void f(int C::*volatile const)', {2: '1fVKM1Ci'})
    check('function', 'void f(int (C::*)(float, double))', {2: '1fM1CFifdE'})
    check('function', 'void f(int (C::* p)(float, double))', {2: '1fM1CFifdE'})
    check('function', 'void f(int (::C::* p)(float, double))', {2: '1fM1CFifdE'})
    check('function', 'void f(void (C::*)() const &)', {2: '1fM1CKRFvvE'})
    check('function', 'int C::* f(int, double)', {2: '1fid'})
    check('function', 'void f(int C::* *p)', {2: '1fPM1Ci'})
    check('function', 'void f(int C::**)', {2: '1fPM1Ci'})
    check('function', 'void f(int C::*const *p)', {2: '1fPKM1Ci'})
    check('function', 'void f(int C::*const*)', {2: '1fPKM1Ci'})

    # exceptions from return type mangling
    check('function', 'template<typename T> C()', {2: 'I0E1Cv'})
    check('function', 'template<typename T> operator int()', {1: None, 2: 'I0Ecviv'})

    # trailing return types
    ids = {1: 'f', 2: '1fv'}
    check('function', 'int f()', ids)
    check('function', 'auto f() -> int', ids)
    check('function', 'virtual auto f() -> int = 0', ids)
    check('function', 'virtual auto f() -> int final', ids)
    check('function', 'virtual auto f() -> int override', ids)

    ids = {2: 'I0E1fv', 4: 'I0E1fiv'}
    check('function', 'template<typename T> int f()', ids)
    check('function', 'template<typename T> f() -> int', ids)

    # from breathe#441
    check('function', 'auto MakeThingy() -> Thingy*', {1: 'MakeThingy', 2: '10MakeThingyv'})


def test_operators():
    check('function', 'void operator new()', {1: "new-operator", 2: "nwv"})
    check('function', 'void operator new[]()', {1: "new-array-operator", 2: "nav"})
    check('function', 'void operator delete()', {1: "delete-operator", 2: "dlv"})
    check('function', 'void operator delete[]()', {1: "delete-array-operator", 2: "dav"})
    check('function', 'operator bool() const', {1: "castto-b-operatorC", 2: "NKcvbEv"})
    check('function', 'void operator""_udl()', {2: 'li4_udlv'})

    check('function', 'void operator~()', {1: "inv-operator", 2: "cov"})
    check('function', 'void operator compl()', {2: "cov"})
    check('function', 'void operator+()', {1: "add-operator", 2: "plv"})
    check('function', 'void operator-()', {1: "sub-operator", 2: "miv"})
    check('function', 'void operator*()', {1: "mul-operator", 2: "mlv"})
    check('function', 'void operator/()', {1: "div-operator", 2: "dvv"})
    check('function', 'void operator%()', {1: "mod-operator", 2: "rmv"})
    check('function', 'void operator&()', {1: "and-operator", 2: "anv"})
    check('function', 'void operator bitand()', {2: "anv"})
    check('function', 'void operator|()', {1: "or-operator", 2: "orv"})
    check('function', 'void operator bitor()', {2: "orv"})
    check('function', 'void operator^()', {1: "xor-operator", 2: "eov"})
    check('function', 'void operator xor()', {2: "eov"})
    check('function', 'void operator=()', {1: "assign-operator", 2: "aSv"})
    check('function', 'void operator+=()', {1: "add-assign-operator", 2: "pLv"})
    check('function', 'void operator-=()', {1: "sub-assign-operator", 2: "mIv"})
    check('function', 'void operator*=()', {1: "mul-assign-operator", 2: "mLv"})
    check('function', 'void operator/=()', {1: "div-assign-operator", 2: "dVv"})
    check('function', 'void operator%=()', {1: "mod-assign-operator", 2: "rMv"})
    check('function', 'void operator&=()', {1: "and-assign-operator", 2: "aNv"})
    check('function', 'void operator and_eq()', {2: "aNv"})
    check('function', 'void operator|=()', {1: "or-assign-operator", 2: "oRv"})
    check('function', 'void operator or_eq()', {2: "oRv"})
    check('function', 'void operator^=()', {1: "xor-assign-operator", 2: "eOv"})
    check('function', 'void operator xor_eq()', {2: "eOv"})
    check('function', 'void operator<<()', {1: "lshift-operator", 2: "lsv"})
    check('function', 'void operator>>()', {1: "rshift-operator", 2: "rsv"})
    check('function', 'void operator<<=()', {1: "lshift-assign-operator", 2: "lSv"})
    check('function', 'void operator>>=()', {1: "rshift-assign-operator", 2: "rSv"})
    check('function', 'void operator==()', {1: "eq-operator", 2: "eqv"})
    check('function', 'void operator!=()', {1: "neq-operator", 2: "nev"})
    check('function', 'void operator not_eq()', {2: "nev"})
    check('function', 'void operator<()', {1: "lt-operator", 2: "ltv"})
    check('function', 'void operator>()', {1: "gt-operator", 2: "gtv"})
    check('function', 'void operator<=()', {1: "lte-operator", 2: "lev"})
    check('function', 'void operator>=()', {1: "gte-operator", 2: "gev"})
    check('function', 'void operator!()', {1: "not-operator", 2: "ntv"})
    check('function', 'void operator not()', {2: "ntv"})
    check('function', 'void operator&&()', {1: "sand-operator", 2: "aav"})
    check('function', 'void operator and()', {2: "aav"})
    check('function', 'void operator||()', {1: "sor-operator", 2: "oov"})
    check('function', 'void operator or()', {2: "oov"})
    check('function', 'void operator++()', {1: "inc-operator", 2: "ppv"})
    check('function', 'void operator--()', {1: "dec-operator", 2: "mmv"})
    check('function', 'void operator,()', {1: "comma-operator", 2: "cmv"})
    check('function', 'void operator->*()', {1: "pointer-by-pointer-operator", 2: "pmv"})
    check('function', 'void operator->()', {1: "pointer-operator", 2: "ptv"})
    check('function', 'void operator()()', {1: "call-operator", 2: "clv"})
    check('function', 'void operator[]()', {1: "subscript-operator", 2: "ixv"})


def test_nested_name():
    check('class', '{key}::A', {1: "A", 2: "1A"})
    check('class', '{key}::A::B', {1: "A::B", 2: "N1A1BE"})
    check('function', 'void f(::A a)', {1: "f__A", 2: "1f1A"})
    check('function', 'void f(::A::B a)', {1: "f__A::B", 2: "1fN1A1BE"})


def test_class_definitions():
    check('class', 'public A', {1: "A", 2: "1A"}, output='{key}A')
    check('class', 'private {key}A', {1: "A", 2: "1A"})
    check('class', '{key}A final', {1: 'A', 2: '1A'})

    # test bases
    check('class', '{key}A', {1: "A", 2: "1A"})
    check('class', '{key}A::B::C', {1: "A::B::C", 2: "N1A1B1CE"})
    check('class', '{key}A : B', {1: "A", 2: "1A"})
    check('class', '{key}A : private B', {1: "A", 2: "1A"})
    check('class', '{key}A : public B', {1: "A", 2: "1A"})
    check('class', '{key}A : B, C', {1: "A", 2: "1A"})
    check('class', '{key}A : B, protected C, D', {1: "A", 2: "1A"})
    check('class', 'A : virtual private B', {1: 'A', 2: '1A'}, output='{key}A : private virtual B')
    check('class', '{key}A : private virtual B', {1: 'A', 2: '1A'})
    check('class', '{key}A : B, virtual C', {1: 'A', 2: '1A'})
    check('class', '{key}A : public virtual B', {1: 'A', 2: '1A'})
    check('class', '{key}A : B, C...', {1: 'A', 2: '1A'})
    check('class', '{key}A : B..., C', {1: 'A', 2: '1A'})

    # from #4094
    check('class', 'template<class, class = std::void_t<>> {key}has_var', {2: 'I00E7has_var'})
    check('class', 'template<class T> {key}has_var<T, std::void_t<decltype(&T::var)>>',
          {2: 'I0E7has_varI1TNSt6void_tIDTadN1T3varEEEEE'})


    check('class', 'template<typename ...Ts> {key}T<int (*)(Ts)...>',
          {2: 'IDpE1TIJPFi2TsEEE'})
    check('class', 'template<int... Is> {key}T<(Is)...>',
          {2: 'I_DpiE1TIJX(Is)EEE', 3: 'I_DpiE1TIJX2IsEEE'})


def test_union_definitions():
    check('union', '{key}A', {2: "1A"})


def test_enum_definitions():
    check('enum', '{key}A', {2: "1A"})
    check('enum', '{key}A : std::underlying_type<B>::type', {2: "1A"})
    check('enum', '{key}A : unsigned int', {2: "1A"})
    check('enum', 'public A', {2: "1A"}, output='{key}A')
    check('enum', 'private {key}A', {2: "1A"})

    check('enumerator', '{key}A', {2: "1A"})
    check('enumerator', '{key}A = std::numeric_limits<unsigned long>::max()', {2: "1A"})


def test_anon_definitions():
    check('class', '@a', {3: "Ut1_a"}, asTextOutput='class [anonymous]')
    check('union', '@a', {3: "Ut1_a"}, asTextOutput='union [anonymous]')
    check('enum', '@a', {3: "Ut1_a"}, asTextOutput='enum [anonymous]')
    check('class', '@1', {3: "Ut1_1"}, asTextOutput='class [anonymous]')
    check('class', '@a::A', {3: "NUt1_a1AE"}, asTextOutput='class [anonymous]::A')


def test_templates():
    check('class', "A<T>", {2: "IE1AI1TE"}, output="template<> {key}A<T>")
    # first just check which objects support templating
    check('class', "template<> {key}A", {2: "IE1A"})
    check('function', "template<> void A()", {2: "IE1Av", 4: "IE1Avv"})
    check('member', "template<> A a", {2: "IE1a"})
    check('type', "template<> {key}a = A", {2: "IE1a"}, key='using')
    with pytest.raises(DefinitionError):
        parse('enum', "template<> A")
    with pytest.raises(DefinitionError):
        parse('enumerator', "template<> A")
    # then all the real tests
    check('class', "template<typename T1, typename T2> {key}A", {2: "I00E1A"})
    check('type', "template<> {key}a", {2: "IE1a"}, key='using')

    check('class', "template<typename T> {key}A", {2: "I0E1A"})
    check('class', "template<class T> {key}A", {2: "I0E1A"})
    check('class', "template<typename ...T> {key}A", {2: "IDpE1A"})
    check('class', "template<typename...> {key}A", {2: "IDpE1A"})
    check('class', "template<typename = Test> {key}A", {2: "I0E1A"})
    check('class', "template<typename T = Test> {key}A", {2: "I0E1A"})

    check('class', "template<template<typename> typename T> {key}A", {2: "II0E0E1A"})
    check('class', "template<template<typename> class T> {key}A", {2: "II0E0E1A"})
    check('class', "template<template<typename> typename> {key}A", {2: "II0E0E1A"})
    check('class', "template<template<typename> typename ...T> {key}A", {2: "II0EDpE1A"})
    check('class', "template<template<typename> typename...> {key}A", {2: "II0EDpE1A"})

    check('class', "template<int> {key}A", {2: "I_iE1A"})
    check('class', "template<int T> {key}A", {2: "I_iE1A"})
    check('class', "template<int... T> {key}A", {2: "I_DpiE1A"})
    check('class', "template<int T = 42> {key}A", {2: "I_iE1A"})
    check('class', "template<int = 42> {key}A", {2: "I_iE1A"})

    check('class', "template<typename A<B>::C> {key}A", {2: "I_N1AI1BE1CEE1A"})
    check('class', "template<typename A<B>::C = 42> {key}A", {2: "I_N1AI1BE1CEE1A"})
    # from #7944
    check('function', "template<typename T, "
                      "typename std::enable_if<!has_overloaded_addressof<T>::value, bool>::type = false"
                      "> constexpr T *static_addressof(T &ref)",
          {2: "I0_NSt9enable_ifIX!has_overloaded_addressof<T>::valueEbE4typeEE16static_addressofR1T",
           3: "I0_NSt9enable_ifIXntN24has_overloaded_addressofI1TE5valueEEbE4typeEE16static_addressofR1T",
           4: "I0_NSt9enable_ifIXntN24has_overloaded_addressofI1TE5valueEEbE4typeEE16static_addressofP1TR1T"})

    check('class', "template<> {key}A<NS::B<>>", {2: "IE1AIN2NS1BIEEE"})

    # from #2058
    check('function',
          "template<typename Char, typename Traits> "
          "inline std::basic_ostream<Char, Traits> &operator<<("
          "std::basic_ostream<Char, Traits> &os, "
          "const c_string_view_base<const Char, Traits> &str)",
          {2: "I00ElsRNSt13basic_ostreamI4Char6TraitsEE"
              "RK18c_string_view_baseIK4Char6TraitsE",
           4: "I00Els"
              "RNSt13basic_ostreamI4Char6TraitsEE"
              "RNSt13basic_ostreamI4Char6TraitsEE"
              "RK18c_string_view_baseIK4Char6TraitsE"})

    # template introductions
    with pytest.raises(DefinitionError):
        parse('enum', 'abc::ns::foo{id_0, id_1, id_2} A')
    with pytest.raises(DefinitionError):
        parse('enumerator', 'abc::ns::foo{id_0, id_1, id_2} A')
    check('class', 'abc::ns::foo{{id_0, id_1, id_2}} {key}xyz::bar',
          {2: 'I000EXN3abc2ns3fooEI4id_04id_14id_2EEN3xyz3barE'})
    check('class', 'abc::ns::foo{{id_0, id_1, ...id_2}} {key}xyz::bar',
          {2: 'I00DpEXN3abc2ns3fooEI4id_04id_1sp4id_2EEN3xyz3barE'})
    check('class', 'abc::ns::foo{{id_0, id_1, id_2}} {key}xyz::bar<id_0, id_1, id_2>',
          {2: 'I000EXN3abc2ns3fooEI4id_04id_14id_2EEN3xyz3barI4id_04id_14id_2EE'})
    check('class', 'abc::ns::foo{{id_0, id_1, ...id_2}} {key}xyz::bar<id_0, id_1, id_2...>',
          {2: 'I00DpEXN3abc2ns3fooEI4id_04id_1sp4id_2EEN3xyz3barI4id_04id_1Dp4id_2EE'})

    check('class', 'template<> Concept{{U}} {key}A<int>::B', {2: 'IEI0EX7ConceptI1UEEN1AIiE1BE'})

    check('type', 'abc::ns::foo{{id_0, id_1, id_2}} {key}xyz::bar = ghi::qux',
          {2: 'I000EXN3abc2ns3fooEI4id_04id_14id_2EEN3xyz3barE'}, key='using')
    check('type', 'abc::ns::foo{{id_0, id_1, ...id_2}} {key}xyz::bar = ghi::qux',
          {2: 'I00DpEXN3abc2ns3fooEI4id_04id_1sp4id_2EEN3xyz3barE'}, key='using')
    check('function', 'abc::ns::foo{id_0, id_1, id_2} void xyz::bar()',
          {2: 'I000EXN3abc2ns3fooEI4id_04id_14id_2EEN3xyz3barEv',
           4: 'I000EXN3abc2ns3fooEI4id_04id_14id_2EEN3xyz3barEvv'})
    check('function', 'abc::ns::foo{id_0, id_1, ...id_2} void xyz::bar()',
          {2: 'I00DpEXN3abc2ns3fooEI4id_04id_1sp4id_2EEN3xyz3barEv',
           4: 'I00DpEXN3abc2ns3fooEI4id_04id_1sp4id_2EEN3xyz3barEvv'})
    check('member', 'abc::ns::foo{id_0, id_1, id_2} ghi::qux xyz::bar',
          {2: 'I000EXN3abc2ns3fooEI4id_04id_14id_2EEN3xyz3barE'})
    check('member', 'abc::ns::foo{id_0, id_1, ...id_2} ghi::qux xyz::bar',
          {2: 'I00DpEXN3abc2ns3fooEI4id_04id_1sp4id_2EEN3xyz3barE'})
    check('concept', 'Iterator{{T, U}} {key}Another', {2: 'I00EX8IteratorI1T1UEE7Another'})
    check('concept', 'template<typename ...Pack> {key}Numerics = (... && Numeric<Pack>)',
          {2: 'IDpE8Numerics'})

    # explicit specializations of members
    check('member', 'template<> int A<int>::a', {2: 'IEN1AIiE1aE'})
    check('member', 'template int A<int>::a', {2: 'IEN1AIiE1aE'},
          output='template<> int A<int>::a')  # same as above
    check('member', 'template<> template<> int A<int>::B<int>::b', {2: 'IEIEN1AIiE1BIiE1bE'})
    check('member', 'template int A<int>::B<int>::b', {2: 'IEIEN1AIiE1BIiE1bE'},
          output='template<> template<> int A<int>::B<int>::b')  # same as above

    # defaulted constrained type parameters
    check('type', 'template<C T = int&> {key}A', {2: 'I_1CE1A'}, key='using')


def test_requires_clauses():
    check('function', 'template<typename T> requires A auto f() -> void requires B',
          {4: 'I0EIQaa1A1BE1fvv'})
    check('function', 'template<typename T> requires A || B or C void f()',
          {4: 'I0EIQoo1Aoo1B1CE1fvv'})
    check('function', 'template<typename T> requires A && B || C and D void f()',
          {4: 'I0EIQooaa1A1Baa1C1DE1fvv'})


def test_template_args():
    # from breathe#218
    check('function',
          "template<typename F> "
          "void allow(F *f, typename func<F, B, G != 1>::type tt)",
          {2: "I0E5allowP1FN4funcI1F1BXG != 1EE4typeE",
           3: "I0E5allowP1FN4funcI1F1BXne1GL1EEE4typeE",
           4: "I0E5allowvP1FN4funcI1F1BXne1GL1EEE4typeE"})
    # from #3542
    check('type', "template<typename T> {key}"
          "enable_if_not_array_t = std::enable_if_t<!is_array<T>::value, int>",
          {2: "I0E21enable_if_not_array_t"},
          key='using')


def test_initializers():
    idsMember = {1: 'v__T', 2: '1v'}
    idsFunction = {1: 'f__T', 2: '1f1T'}
    idsTemplate = {2: 'I_1TE1fv', 4: 'I_1TE1fvv'}
    # no init
    check('member', 'T v', idsMember)
    check('function', 'void f(T v)', idsFunction)
    check('function', 'template<T v> void f()', idsTemplate)
    # with '=', assignment-expression
    check('member', 'T v = 42', idsMember)
    check('function', 'void f(T v = 42)', idsFunction)
    check('function', 'template<T v = 42> void f()', idsTemplate)
    # with '=', braced-init
    check('member', 'T v = {}', idsMember)
    check('function', 'void f(T v = {})', idsFunction)
    check('function', 'template<T v = {}> void f()', idsTemplate)
    check('member', 'T v = {42, 42, 42}', idsMember)
    check('function', 'void f(T v = {42, 42, 42})', idsFunction)
    check('function', 'template<T v = {42, 42, 42}> void f()', idsTemplate)
    check('member', 'T v = {42, 42, 42,}', idsMember)
    check('function', 'void f(T v = {42, 42, 42,})', idsFunction)
    check('function', 'template<T v = {42, 42, 42,}> void f()', idsTemplate)
    check('member', 'T v = {42, 42, args...}', idsMember)
    check('function', 'void f(T v = {42, 42, args...})', idsFunction)
    check('function', 'template<T v = {42, 42, args...}> void f()', idsTemplate)
    # without '=', braced-init
    check('member', 'T v{}', idsMember)
    check('member', 'T v{42, 42, 42}', idsMember)
    check('member', 'T v{42, 42, 42,}', idsMember)
    check('member', 'T v{42, 42, args...}', idsMember)
    # other
    check('member', 'T v = T{}', idsMember)


def test_attributes():
    # style: C++
    check('member', '[[]] int f', {1: 'f__i', 2: '1f'})
    check('member', '[ [ ] ] int f', {1: 'f__i', 2: '1f'},
          # this will fail when the proper grammar is implemented
          output='[[ ]] int f')
    check('member', '[[a]] int f', {1: 'f__i', 2: '1f'})
    # style: GNU
    check('member', '__attribute__(()) int f', {1: 'f__i', 2: '1f'})
    check('member', '__attribute__((a)) int f', {1: 'f__i', 2: '1f'})
    check('member', '__attribute__((a, b)) int f', {1: 'f__i', 2: '1f'})
    check('member', '__attribute__((optimize(3))) int f', {1: 'f__i', 2: '1f'})
    check('member', '__attribute__((format(printf, 1, 2))) int f', {1: 'f__i', 2: '1f'})
    # style: user-defined id
    check('member', 'id_attr int f', {1: 'f__i', 2: '1f'})
    # style: user-defined paren
    check('member', 'paren_attr() int f', {1: 'f__i', 2: '1f'})
    check('member', 'paren_attr(a) int f', {1: 'f__i', 2: '1f'})
    check('member', 'paren_attr("") int f', {1: 'f__i', 2: '1f'})
    check('member', 'paren_attr(()[{}][]{}) int f', {1: 'f__i', 2: '1f'})
    with pytest.raises(DefinitionError):
        parse('member', 'paren_attr(() int f')
    with pytest.raises(DefinitionError):
        parse('member', 'paren_attr([) int f')
    with pytest.raises(DefinitionError):
        parse('member', 'paren_attr({) int f')
    with pytest.raises(DefinitionError):
        parse('member', 'paren_attr([)]) int f')
    with pytest.raises(DefinitionError):
        parse('member', 'paren_attr((])) int f')
    with pytest.raises(DefinitionError):
        parse('member', 'paren_attr({]}) int f')

    # position: decl specs
    check('function', 'static inline __attribute__(()) void f()',
          {1: 'f', 2: '1fv'},
          output='__attribute__(()) static inline void f()')
    check('function', '[[attr1]] [[attr2]] void f()',
          {1: 'f', 2: '1fv'},
          output='[[attr1]] [[attr2]] void f()')
    # position: declarator
    check('member', 'int *[[attr]] i', {1: 'i__iP', 2: '1i'})
    check('member', 'int *const [[attr]] volatile i', {1: 'i__iPVC', 2: '1i'},
          output='int *[[attr]] volatile const i')
    check('member', 'int &[[attr]] i', {1: 'i__iR', 2: '1i'})
    check('member', 'int *[[attr]] *i', {1: 'i__iPP', 2: '1i'})


def test_xref_parsing():
    def check(target):
        class Config:
            cpp_id_attributes = ["id_attr"]
            cpp_paren_attributes = ["paren_attr"]
        parser = DefinitionParser(target, location=None,
                                  config=Config())
        ast, isShorthand = parser.parse_xref_object()
        parser.assert_end()
    check('f')
    check('f()')
    check('void f()')
    check('T f()')


# def test_print():
#     # used for getting all the ids out for checking
#     for a in ids:
#         print(a)
#     raise DefinitionError("")


def filter_warnings(warning, file):
    lines = warning.getvalue().split("\n")
    res = [l for l in lines if "domain-cpp" in l and "{}.rst".format(file) in l and
           "WARNING: document isn't included in any toctree" not in l]
    print("Filtered warnings for file '{}':".format(file))
    for w in res:
        print(w)
    return res


@pytest.mark.sphinx(testroot='domain-cpp', confoverrides={'nitpicky': True})
def test_build_domain_cpp_multi_decl_lookup(app, status, warning):
    app.builder.build_all()
    ws = filter_warnings(warning, "lookup-key-overload")
    assert len(ws) == 0

    ws = filter_warnings(warning, "multi-decl-lookup")
    assert len(ws) == 0


@pytest.mark.sphinx(testroot='domain-cpp', confoverrides={'nitpicky': True})
def test_build_domain_cpp_warn_template_param_qualified_name(app, status, warning):
    app.builder.build_all()
    ws = filter_warnings(warning, "warn-template-param-qualified-name")
    assert len(ws) == 2
    assert "WARNING: cpp:type reference target not found: T::typeWarn" in ws[0]
    assert "WARNING: cpp:type reference target not found: T::U::typeWarn" in ws[1]


@pytest.mark.sphinx(testroot='domain-cpp', confoverrides={'nitpicky': True})
def test_build_domain_cpp_backslash_ok(app, status, warning):
    app.builder.build_all()
    ws = filter_warnings(warning, "backslash")
    assert len(ws) == 0


@pytest.mark.sphinx(testroot='domain-cpp', confoverrides={'nitpicky': True})
def test_build_domain_cpp_semicolon(app, status, warning):
    app.builder.build_all()
    ws = filter_warnings(warning, "semicolon")
    assert len(ws) == 0


@pytest.mark.sphinx(testroot='domain-cpp',
                    confoverrides={'nitpicky': True, 'strip_signature_backslash': True})
def test_build_domain_cpp_backslash_ok(app, status, warning):
    app.builder.build_all()
    ws = filter_warnings(warning, "backslash")
    assert len(ws) == 1
    assert "WARNING: Parsing of expression failed. Using fallback parser." in ws[0]


@pytest.mark.sphinx(testroot='domain-cpp', confoverrides={'nitpicky': True})
def test_build_domain_cpp_anon_dup_decl(app, status, warning):
    app.builder.build_all()
    ws = filter_warnings(warning, "anon-dup-decl")
    assert len(ws) == 2
    assert "WARNING: cpp:identifier reference target not found: @a" in ws[0]
    assert "WARNING: cpp:identifier reference target not found: @b" in ws[1]


@pytest.mark.sphinx(testroot='domain-cpp')
def test_build_domain_cpp_misuse_of_roles(app, status, warning):
    app.builder.build_all()
    ws = filter_warnings(warning, "roles-targets-ok")
    assert len(ws) == 0

    ws = filter_warnings(warning, "roles-targets-warn")
    # the roles that should be able to generate warnings:
    allRoles = ['class', 'struct', 'union', 'func', 'member', 'var', 'type', 'concept', 'enum', 'enumerator']
    ok = [  # targetType, okRoles
        ('class', ['class', 'struct', 'type']),
        ('union', ['union', 'type']),
        ('func', ['func', 'type']),
        ('member', ['member', 'var']),
        ('type', ['type']),
        ('concept', ['concept']),
        ('enum', ['type', 'enum']),
        ('enumerator', ['enumerator']),
        ('tParam', ['class', 'struct', 'union', 'func', 'member', 'var', 'type', 'concept', 'enum', 'enumerator', 'functionParam']),
        ('functionParam', ['member', 'var']),
    ]
    warn = []
    for targetType, roles in ok:
        txtTargetType = "function" if targetType == "func" else targetType
        for r in allRoles:
            if r not in roles:
                warn.append("WARNING: cpp:{} targets a {} (".format(r, txtTargetType))
    warn = list(sorted(warn))
    for w in ws:
        assert "targets a" in w
    ws = [w[w.index("WARNING:"):] for w in ws]
    ws = list(sorted(ws))
    print("Expected warnings:")
    for w in warn:
        print(w)
    print("Actual warnings:")
    for w in ws:
        print(w)

    for i in range(min(len(warn), len(ws))):
        assert ws[i].startswith(warn[i])

    assert len(ws) == len(warn)


@pytest.mark.skipif(docutils.__version_info__ < (0, 13),
                    reason='docutils-0.13 or above is required')
@pytest.mark.sphinx(testroot='domain-cpp', confoverrides={'add_function_parentheses': True})
def test_build_domain_cpp_with_add_function_parentheses_is_True(app, status, warning):
    app.builder.build_all()

    def check(spec, text, file):
        pattern = '<li><p>%s<a .*?><code .*?><span .*?>%s</span></code></a></p></li>' % spec
        res = re.search(pattern, text)
        if not res:
            print("Pattern\n\t%s\nnot found in %s" % (pattern, file))
            assert False
    rolePatterns = [
        ('', 'Sphinx'),
        ('', 'Sphinx::version'),
        ('', 'version'),
        ('', 'List'),
        ('', 'MyEnum')
    ]
    parenPatterns = [
        ('ref function without parens ', r'paren_1\(\)'),
        ('ref function with parens ', r'paren_2\(\)'),
        ('ref function without parens, explicit title ', 'paren_3_title'),
        ('ref function with parens, explicit title ', 'paren_4_title'),
        ('ref op call without parens ', r'paren_5::operator\(\)\(\)'),
        ('ref op call with parens ', r'paren_6::operator\(\)\(\)'),
        ('ref op call without parens, explicit title ', 'paren_7_title'),
        ('ref op call with parens, explicit title ', 'paren_8_title')
    ]

    f = 'roles.html'
    t = (app.outdir / f).read_text()
    for s in rolePatterns:
        check(s, t, f)
    for s in parenPatterns:
        check(s, t, f)

    f = 'any-role.html'
    t = (app.outdir / f).read_text()
    for s in parenPatterns:
        check(s, t, f)


@pytest.mark.skipif(docutils.__version_info__ < (0, 13),
                    reason='docutils-0.13 or above is required')
@pytest.mark.sphinx(testroot='domain-cpp', confoverrides={'add_function_parentheses': False})
def test_build_domain_cpp_with_add_function_parentheses_is_False(app, status, warning):
    app.builder.build_all()

    def check(spec, text, file):
        pattern = '<li><p>%s<a .*?><code .*?><span .*?>%s</span></code></a></p></li>' % spec
        res = re.search(pattern, text)
        if not res:
            print("Pattern\n\t%s\nnot found in %s" % (pattern, file))
            assert False
    rolePatterns = [
        ('', 'Sphinx'),
        ('', 'Sphinx::version'),
        ('', 'version'),
        ('', 'List'),
        ('', 'MyEnum')
    ]
    parenPatterns = [
        ('ref function without parens ', 'paren_1'),
        ('ref function with parens ', 'paren_2'),
        ('ref function without parens, explicit title ', 'paren_3_title'),
        ('ref function with parens, explicit title ', 'paren_4_title'),
        ('ref op call without parens ', r'paren_5::operator\(\)'),
        ('ref op call with parens ', r'paren_6::operator\(\)'),
        ('ref op call without parens, explicit title ', 'paren_7_title'),
        ('ref op call with parens, explicit title ', 'paren_8_title')
    ]

    f = 'roles.html'
    t = (app.outdir / f).read_text()
    for s in rolePatterns:
        check(s, t, f)
    for s in parenPatterns:
        check(s, t, f)

    f = 'any-role.html'
    t = (app.outdir / f).read_text()
    for s in parenPatterns:
        check(s, t, f)


@pytest.mark.sphinx(testroot='domain-cpp')
def test_xref_consistency(app, status, warning):
    app.builder.build_all()

    test = 'xref_consistency.html'
    output = (app.outdir / test).read_text()

    def classes(role, tag):
        pattern = (r'{role}-role:.*?'
                   r'<(?P<tag>{tag}) .*?class=["\'](?P<classes>.*?)["\'].*?>'
                   r'.*'
                   r'</(?P=tag)>').format(role=role, tag=tag)
        result = re.search(pattern, output)
        expect = '''\
Pattern for role `{role}` with tag `{tag}`
\t{pattern}
not found in `{test}`
'''.format(role=role, tag=tag, pattern=pattern, test=test)
        assert result, expect
        return set(result.group('classes').split())

    class RoleClasses:
        """Collect the classes from the layout that was generated for a given role."""

        def __init__(self, role, root, contents):
            self.name = role
            self.classes = classes(role, root)
            self.content_classes = dict()
            for tag in contents:
                self.content_classes[tag] = classes(role, tag)

    # not actually used as a reference point
    # code_role = RoleClasses('code', 'code', [])
    any_role = RoleClasses('any', 'a', ['code'])
    cpp_any_role = RoleClasses('cpp-any', 'a', ['code'])
    # NYI: consistent looks
    # texpr_role = RoleClasses('cpp-texpr', 'span', ['a', 'code'])
    expr_role = RoleClasses('cpp-expr', 'code', ['a'])
    texpr_role = RoleClasses('cpp-texpr', 'span', ['a', 'span'])

    # XRefRole-style classes

    # any and cpp:any do not put these classes at the root

    # n.b. the generic any machinery finds the specific 'cpp-class' object type
    expect = 'any uses XRefRole classes'
    assert {'xref', 'any', 'cpp', 'cpp-class'} <= any_role.content_classes['code'], expect

    expect = 'cpp:any uses XRefRole classes'
    assert {'xref', 'cpp-any', 'cpp'} <= cpp_any_role.content_classes['code'], expect

    for role in (expr_role, texpr_role):
        name = role.name
        expect = '`{name}` puts the domain and role classes at its root'.format(name=name)
        # NYI: xref should go in the references
        assert {'xref', 'cpp', name} <= role.classes, expect

    # reference classes

    expect = 'the xref roles use the same reference classes'
    assert any_role.classes == cpp_any_role.classes, expect
    assert any_role.classes == expr_role.content_classes['a'], expect
    assert any_role.classes == texpr_role.content_classes['a'], expect


def test_noindexentry(app):
    text = (".. cpp:function:: void f()\n"
            ".. cpp:function:: void g()\n"
            "   :noindexentry:\n")
    doctree = restructuredtext.parse(app, text)
    assert_node(doctree, (addnodes.index, desc, addnodes.index, desc))
    assert_node(doctree[0], addnodes.index, entries=[('single', 'f (C++ function)', '_CPPv41fv', '', None)])
    assert_node(doctree[2], addnodes.index, entries=[])