1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
// This file is a part of toml++ and is subject to the the terms of the MIT license.
// Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
// See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
// SPDX-License-Identifier: MIT
// This example shows the error messages the library produces by forcing a set of specific parsing
// failures and printing their results.
#include "examples.hpp"
#include <toml++/toml.hpp>
#include <cctype> // For iscntrl.
#include <iomanip> // For setfill, hex, etc.
#include <optional>
using namespace std::string_view_literals;
namespace
{
inline constexpr auto invalid_parses = std::array{
"########## comments and whitespace"sv,
"# bar\rkek"sv,
"# bar\bkek"sv,
"# DEL character: '\x7f'"sv,
"# \xf1\x63"sv,
"# val1 = 1\fval2 = 2"sv,
"foo = 1\n\u2000\nbar = 2"sv,
"########## inline tables"sv,
"val = {,}"sv,
"val = {a='b',}"sv, // allowed when TOML_ENABLE_UNRELEASED_FEATURES == 1
"val = {a='b',,}"sv,
"val = {a='b',"sv,
"val = {a='b',\n c='d'}"sv, // allowed when TOML_ENABLE_UNRELEASED_FEATURES == 1
"val = {?='b'}"sv,
"foo = {} \n [foo.bar]"sv,
"########## tables"sv,
"[]"sv,
"[foo"sv,
"[foo] ?"sv,
"[foo] [bar]"sv,
"[foo]\n[foo]"sv,
"? = 'foo' ?"sv,
"[ [foo] ]"sv,
"########## arrays"sv,
"val = [,]"sv,
"val = ['a',,]"sv,
"val = ['a',"sv,
"########## key-value pairs"sv,
"val = 'foo' ?"sv,
"val = "sv,
"val "sv,
"val ?"sv,
"val = ]"sv,
"[foo]\nbar = 'kek'\nbar = 'kek2'"sv,
"[foo]\nbar = 'kek'\nbar = 7"sv,
"[foo.bar]\n[foo]\nbar = 'kek'"sv,
"[foo]\nbar = 'kek'\nbar.kek = 7"sv,
"[foo]\nbar.? = 'kek'"sv,
R"('''val''' = 1)"sv,
R"(a."""val""" = 1)"sv,
"1= 0x6cA#+\xf1"sv,
R"(😂 = 3)"sv, // allowed when TOML_ENABLE_UNRELEASED_FEATURES == 1
"########## values"sv,
"val = _"sv,
"val = G"sv,
"PATHOLOGICALLY_NESTED"sv, // generated inline
"########## strings"sv,
"val = \" \r \""sv,
R"(val = ")"sv,
R"(val = "\g")"sv,
R"(val = "\x20")"sv, // allowed when TOML_ENABLE_UNRELEASED_FEATURES == 1
R"(val = "\uFFF")"sv,
R"(val = "\uFFFG")"sv,
R"(val = "\UFFFFFFF")"sv,
R"(val = "\UFFFFFGF")"sv,
R"(val = "\uD801")"sv,
R"(val = "\U00110000")"sv,
R"(val = """ """""")"sv,
R"(val = ''' '''''')"sv,
"val = '\n'"sv,
"########## integers"sv,
R"(val = -0b0)"sv,
R"(val = -0o0)"sv,
R"(val = -0x0)"sv,
R"(val = +0b0)"sv,
R"(val = +0o0)"sv,
R"(val = +0x0)"sv,
R"(val = 1-)"sv,
R"(val = -1+)"sv,
R"(val = -+1)"sv,
R"(val = 1_0_)"sv,
R"(val = 1_0_ )"sv,
R"(val = 01 )"sv,
R"(val = 0b10000000_00000000_00000000_00000000_00000000_00000000_00000000_00000000 )"sv,
R"(val = 0o1000000000000000000000 )"sv,
R"(val = 9223372036854775808 )"sv,
R"(val = 0x8000000000000000 )"sv,
"########## floats"sv,
R"(val = 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.0)"sv,
};
inline constexpr auto divider =
"################################################################################"sv;
void print_string(std::string_view str)
{
for (char c : str)
{
if (std::optional<std::string_view> escape_sequence = (c == '\\') ? "\\\\"sv
: (c == '\a') ? "\\a"sv
: (c == '\b') ? "\\b"sv
: (c == '\f') ? "\\f"sv
: (c == '\n') ? "\\n"sv
: (c == '\r') ? "\\r"sv
: (c == '\t') ? "\\t"sv
: (c == '\v') ? "\\v"sv
: std::optional<std::string_view>{})
{
std::cout << *escape_sequence;
}
else
{
if (c >= 0 && std::iscntrl(c))
{
// Print a string, just like `toml::impl::control_char_escapes[c]`.
std::ostringstream stream;
stream << "\\u00"sv << std::setfill('0') << std::setw(2) << std::hex << std::uppercase << int{ c };
std::cout << stream.str();
}
else
{
std::cout << c;
}
}
}
}
void print_parse_error(std::string_view doc, const toml::parse_error& err)
{
std::cout << err;
auto line_num = err.source().begin.line;
if (auto line = toml::get_line(doc, line_num))
{
std::cout << "\nLine "sv << line_num << ": "sv;
print_string(*line);
}
std::cout << "\n\n"sv;
}
}
int main()
{
const auto parse_and_print_if_error = [](std::string_view str)
{
#if TOML_EXCEPTIONS
try
{
auto result = toml::parse(str);
static_cast<void>(result);
}
catch (const toml::parse_error& err)
{
print_parse_error(str, err);
}
#else
if (auto result = toml::parse(str); !result)
print_parse_error(str, result.error());
#endif
};
for (auto str : invalid_parses)
{
if (str.empty())
continue;
// section headings
if (str.substr(0, 10) == "##########"sv)
{
std::cout << divider << '\n';
std::cout << "# "sv << str.substr(11) << '\n';
std::cout << divider << "\n\n"sv;
}
// error messages
else
{
toml::parse_result result;
if (str == "PATHOLOGICALLY_NESTED"sv)
{
std::string s(1000u, '[');
constexpr auto start = "array = "sv;
memcpy(s.data(), start.data(), start.length());
parse_and_print_if_error(s);
}
else
parse_and_print_if_error(str);
}
}
return 0;
}
|
