1//===----------------------------------------------------------------------===//
2// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
3// See https://llvm.org/LICENSE.txt for license information.
4// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
5//
6//===----------------------------------------------------------------------===//
7
8// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
9
10// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
11
12// <format>
13
14// template<class T, class charT = char>
15// requires same_as<remove_cvref_t<T>, T> && formattable<T, charT>
16// class range_formatter
17
18// template<class FormatContext>
19// typename FormatContext::iterator
20// format(const T& ref, FormatContext& ctx) const;
21
22// Note this tests the basics of this function. It's tested in more detail in
23// the format functions test.
24
25#include <cassert>
26#include <concepts>
27#include <iterator>
28#include <format>
29#include <vector>
30
31#include "assert_macros.h"
32#include "format.functions.common.h"
33#include "make_string.h"
34#include "test_format_context.h"
35#include "test_macros.h"
36
37#define SV(S) MAKE_STRING_VIEW(CharT, S)
38
39template <class StringViewT>
40void test_format(StringViewT expected, std::vector<int> arg) {
41 using CharT = typename StringViewT::value_type;
42 using String = std::basic_string<CharT>;
43 using OutIt = std::back_insert_iterator<String>;
44 using FormatCtxT = std::basic_format_context<OutIt, CharT>;
45
46 const std::range_formatter<int, CharT> formatter;
47
48 String result;
49 OutIt out = std::back_inserter(result);
50 FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
51 formatter.format(arg, format_ctx);
52 assert(result == expected);
53}
54
55template <class CharT>
56void test_assure_parse_is_called(std::basic_string_view<CharT> fmt) {
57 using String = std::basic_string<CharT>;
58 using OutIt = std::back_insert_iterator<String>;
59 using FormatCtxT = std::basic_format_context<OutIt, CharT>;
60 std::vector<parse_call_validator> arg{1};
61
62 String result;
63 OutIt out = std::back_inserter(result);
64 FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
65
66 std::range_formatter<parse_call_validator, CharT> formatter;
67 std::basic_format_parse_context<CharT> ctx{fmt};
68
69 formatter.parse(ctx);
70 formatter.format(arg, format_ctx);
71}
72
73template <class CharT>
74void test_assure_parse_is_called() {
75 using String = std::basic_string<CharT>;
76 using OutIt = std::back_insert_iterator<String>;
77 using FormatCtxT = std::basic_format_context<OutIt, CharT>;
78 std::vector<parse_call_validator> arg{1};
79
80 String result;
81 OutIt out = std::back_inserter(result);
82 [[maybe_unused]] FormatCtxT format_ctx =
83 test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
84
85 { // parse not called
86 [[maybe_unused]] const std::range_formatter<parse_call_validator, CharT> formatter;
87 TEST_THROWS_TYPE(parse_call_validator::parse_function_not_called, formatter.format(arg, format_ctx));
88 }
89
90 // The range-format-spec has no range-underlying-spec
91 // This uses various variants, which have different code paths in libc++
92 test_assure_parse_is_called(SV("5"));
93 test_assure_parse_is_called(SV("n"));
94 test_assure_parse_is_called(SV(":"));
95 test_assure_parse_is_called(SV("5"));
96 test_assure_parse_is_called(SV("5n"));
97 test_assure_parse_is_called(SV("5n:"));
98}
99
100template <class CharT>
101void test_fmt() {
102 test_format(SV("[1]"), std::vector<int>{1});
103 test_format(SV("[0]"), std::vector<int>{0});
104
105 test_assure_parse_is_called<CharT>();
106}
107
108void test() {
109 test_fmt<char>();
110#ifndef TEST_HAS_NO_WIDE_CHARACTERS
111 test_fmt<wchar_t>();
112#endif
113}
114
115int main(int, char**) {
116 test();
117
118 return 0;
119}
120

source code of libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp