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/*
__ _____ _____ _____
__| | __| | | | JSON for Modern C++ (test suite)
| | |__ | | | | | | version 3.9.1
|_____|_____|_____|_|___| https://github.com/nlohmann/json
Licensed under the MIT License <http://opensource.org/licenses/MIT>.
SPDX-License-Identifier: MIT
Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include "doctest_compatibility.h"
#define JSON_TESTS_PRIVATE
#include <nlohmann/json.hpp>
using nlohmann::json;
namespace
{
// shortcut to scan a string literal
json::lexer::token_type scan_string(const char* s, const bool ignore_comments = false);
json::lexer::token_type scan_string(const char* s, const bool ignore_comments)
{
auto ia = nlohmann::detail::input_adapter(s);
return nlohmann::detail::lexer<json, decltype(ia)>(std::move(ia), ignore_comments).scan();
}
}
std::string get_error_message(const char* s, const bool ignore_comments = false);
std::string get_error_message(const char* s, const bool ignore_comments)
{
auto ia = nlohmann::detail::input_adapter(s);
auto lexer = nlohmann::detail::lexer<json, decltype(ia)>(std::move(ia), ignore_comments);
lexer.scan();
return lexer.get_error_message();
}
TEST_CASE("lexer class")
{
SECTION("scan")
{
SECTION("structural characters")
{
CHECK((scan_string("[") == json::lexer::token_type::begin_array));
CHECK((scan_string("]") == json::lexer::token_type::end_array));
CHECK((scan_string("{") == json::lexer::token_type::begin_object));
CHECK((scan_string("}") == json::lexer::token_type::end_object));
CHECK((scan_string(",") == json::lexer::token_type::value_separator));
CHECK((scan_string(":") == json::lexer::token_type::name_separator));
}
SECTION("literal names")
{
CHECK((scan_string("null") == json::lexer::token_type::literal_null));
CHECK((scan_string("true") == json::lexer::token_type::literal_true));
CHECK((scan_string("false") == json::lexer::token_type::literal_false));
}
SECTION("numbers")
{
CHECK((scan_string("0") == json::lexer::token_type::value_unsigned));
CHECK((scan_string("1") == json::lexer::token_type::value_unsigned));
CHECK((scan_string("2") == json::lexer::token_type::value_unsigned));
CHECK((scan_string("3") == json::lexer::token_type::value_unsigned));
CHECK((scan_string("4") == json::lexer::token_type::value_unsigned));
CHECK((scan_string("5") == json::lexer::token_type::value_unsigned));
CHECK((scan_string("6") == json::lexer::token_type::value_unsigned));
CHECK((scan_string("7") == json::lexer::token_type::value_unsigned));
CHECK((scan_string("8") == json::lexer::token_type::value_unsigned));
CHECK((scan_string("9") == json::lexer::token_type::value_unsigned));
CHECK((scan_string("-0") == json::lexer::token_type::value_integer));
CHECK((scan_string("-1") == json::lexer::token_type::value_integer));
CHECK((scan_string("1.1") == json::lexer::token_type::value_float));
CHECK((scan_string("-1.1") == json::lexer::token_type::value_float));
CHECK((scan_string("1E10") == json::lexer::token_type::value_float));
}
SECTION("whitespace")
{
// result is end_of_input, because not token is following
CHECK((scan_string(" ") == json::lexer::token_type::end_of_input));
CHECK((scan_string("\t") == json::lexer::token_type::end_of_input));
CHECK((scan_string("\n") == json::lexer::token_type::end_of_input));
CHECK((scan_string("\r") == json::lexer::token_type::end_of_input));
CHECK((scan_string(" \t\n\r\n\t ") == json::lexer::token_type::end_of_input));
}
}
SECTION("token_type_name")
{
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::uninitialized)) == "<uninitialized>"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::literal_true)) == "true literal"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::literal_false)) == "false literal"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::literal_null)) == "null literal"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::value_string)) == "string literal"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::value_unsigned)) == "number literal"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::value_integer)) == "number literal"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::value_float)) == "number literal"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::begin_array)) == "'['"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::begin_object)) == "'{'"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::end_array)) == "']'"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::end_object)) == "'}'"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::name_separator)) == "':'"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::value_separator)) == "','"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::parse_error)) == "<parse error>"));
CHECK((std::string(json::lexer::token_type_name(json::lexer::token_type::end_of_input)) == "end of input"));
}
SECTION("parse errors on first character")
{
for (int c = 1; c < 128; ++c)
{
// create string from the ASCII code
const auto s = std::string(1, static_cast<char>(c));
// store scan() result
const auto res = scan_string(s.c_str());
CAPTURE(s)
switch (c)
{
// single characters that are valid tokens
case ('['):
case (']'):
case ('{'):
case ('}'):
case (','):
case (':'):
case ('0'):
case ('1'):
case ('2'):
case ('3'):
case ('4'):
case ('5'):
case ('6'):
case ('7'):
case ('8'):
case ('9'):
{
CHECK((res != json::lexer::token_type::parse_error));
break;
}
// whitespace
case (' '):
case ('\t'):
case ('\n'):
case ('\r'):
{
CHECK((res == json::lexer::token_type::end_of_input));
break;
}
// anything else is not expected
default:
{
CHECK((res == json::lexer::token_type::parse_error));
break;
}
}
}
}
SECTION("very large string")
{
// strings larger than 1024 bytes yield a resize of the lexer's yytext buffer
std::string s("\"");
s += std::string(2048, 'x');
s += "\"";
CHECK((scan_string(s.c_str()) == json::lexer::token_type::value_string));
}
SECTION("fail on comments")
{
CHECK((scan_string("/", false) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/", false) == "invalid literal");
CHECK((scan_string("/!", false) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/!", false) == "invalid literal");
CHECK((scan_string("/*", false) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/*", false) == "invalid literal");
CHECK((scan_string("/**", false) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/**", false) == "invalid literal");
CHECK((scan_string("//", false) == json::lexer::token_type::parse_error));
CHECK(get_error_message("//", false) == "invalid literal");
CHECK((scan_string("/**/", false) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/**/", false) == "invalid literal");
CHECK((scan_string("/** /", false) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/** /", false) == "invalid literal");
CHECK((scan_string("/***/", false) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/***/", false) == "invalid literal");
CHECK((scan_string("/* true */", false) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/* true */", false) == "invalid literal");
CHECK((scan_string("/*/**/", false) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/*/**/", false) == "invalid literal");
CHECK((scan_string("/*/* */", false) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/*/* */", false) == "invalid literal");
}
SECTION("ignore comments")
{
CHECK((scan_string("/", true) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/", true) == "invalid comment; expecting '/' or '*' after '/'");
CHECK((scan_string("/!", true) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/!", true) == "invalid comment; expecting '/' or '*' after '/'");
CHECK((scan_string("/*", true) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/*", true) == "invalid comment; missing closing '*/'");
CHECK((scan_string("/**", true) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/**", true) == "invalid comment; missing closing '*/'");
CHECK((scan_string("//", true) == json::lexer::token_type::end_of_input));
CHECK((scan_string("/**/", true) == json::lexer::token_type::end_of_input));
CHECK((scan_string("/** /", true) == json::lexer::token_type::parse_error));
CHECK(get_error_message("/** /", true) == "invalid comment; missing closing '*/'");
CHECK((scan_string("/***/", true) == json::lexer::token_type::end_of_input));
CHECK((scan_string("/* true */", true) == json::lexer::token_type::end_of_input));
CHECK((scan_string("/*/**/", true) == json::lexer::token_type::end_of_input));
CHECK((scan_string("/*/* */", true) == json::lexer::token_type::end_of_input));
CHECK((scan_string("//\n//\n", true) == json::lexer::token_type::end_of_input));
CHECK((scan_string("/**//**//**/", true) == json::lexer::token_type::end_of_input));
}
}