237 lines
7.8 KiB
C++
237 lines
7.8 KiB
C++
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#pragma once
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#include <exception> // exception
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#include <stdexcept> // runtime_error
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#include <string> // to_string
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#include <vector> // vector
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#include <nlohmann/detail/value_t.hpp>
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#include <nlohmann/detail/string_escape.hpp>
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#include <nlohmann/detail/input/position_t.hpp>
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#include <nlohmann/detail/macro_scope.hpp>
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namespace nlohmann
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{
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namespace detail
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{
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////////////////
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// exceptions //
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////////////////
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/// @brief general exception of the @ref basic_json class
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/// @sa https://json.nlohmann.me/api/basic_json/exception/
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class exception : public std::exception
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{
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public:
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/// returns the explanatory string
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const char* what() const noexcept override
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{
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return m.what();
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}
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/// the id of the exception
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const int id; // NOLINT(cppcoreguidelines-non-private-member-variables-in-classes)
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protected:
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JSON_HEDLEY_NON_NULL(3)
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exception(int id_, const char* what_arg) : id(id_), m(what_arg) {} // NOLINT(bugprone-throw-keyword-missing)
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static std::string name(const std::string& ename, int id_)
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{
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return "[json.exception." + ename + "." + std::to_string(id_) + "] ";
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}
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template<typename BasicJsonType>
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static std::string diagnostics(const BasicJsonType& leaf_element)
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{
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#if JSON_DIAGNOSTICS
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std::vector<std::string> tokens;
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for (const auto* current = &leaf_element; current->m_parent != nullptr; current = current->m_parent)
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{
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switch (current->m_parent->type())
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{
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case value_t::array:
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{
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for (std::size_t i = 0; i < current->m_parent->m_value.array->size(); ++i)
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{
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if (¤t->m_parent->m_value.array->operator[](i) == current)
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{
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tokens.emplace_back(std::to_string(i));
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break;
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}
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}
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break;
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}
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case value_t::object:
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{
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for (const auto& element : *current->m_parent->m_value.object)
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{
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if (&element.second == current)
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{
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tokens.emplace_back(element.first.c_str());
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break;
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}
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}
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break;
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}
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case value_t::null: // LCOV_EXCL_LINE
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case value_t::string: // LCOV_EXCL_LINE
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case value_t::boolean: // LCOV_EXCL_LINE
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case value_t::number_integer: // LCOV_EXCL_LINE
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case value_t::number_unsigned: // LCOV_EXCL_LINE
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case value_t::number_float: // LCOV_EXCL_LINE
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case value_t::binary: // LCOV_EXCL_LINE
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case value_t::discarded: // LCOV_EXCL_LINE
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default: // LCOV_EXCL_LINE
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break; // LCOV_EXCL_LINE
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}
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}
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if (tokens.empty())
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{
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return "";
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}
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return "(" + std::accumulate(tokens.rbegin(), tokens.rend(), std::string{},
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[](const std::string & a, const std::string & b)
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{
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return a + "/" + detail::escape(b);
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}) + ") ";
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#else
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static_cast<void>(leaf_element);
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return "";
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#endif
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}
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private:
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/// an exception object as storage for error messages
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std::runtime_error m;
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};
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/// @brief exception indicating a parse error
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/// @sa https://json.nlohmann.me/api/basic_json/parse_error/
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class parse_error : public exception
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{
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public:
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/*!
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@brief create a parse error exception
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@param[in] id_ the id of the exception
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@param[in] pos the position where the error occurred (or with
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chars_read_total=0 if the position cannot be
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determined)
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@param[in] what_arg the explanatory string
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@return parse_error object
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*/
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template<typename BasicJsonType>
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static parse_error create(int id_, const position_t& pos, const std::string& what_arg, const BasicJsonType& context)
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{
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std::string w = exception::name("parse_error", id_) + "parse error" +
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position_string(pos) + ": " + exception::diagnostics(context) + what_arg;
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return {id_, pos.chars_read_total, w.c_str()};
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}
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template<typename BasicJsonType>
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static parse_error create(int id_, std::size_t byte_, const std::string& what_arg, const BasicJsonType& context)
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{
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std::string w = exception::name("parse_error", id_) + "parse error" +
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(byte_ != 0 ? (" at byte " + std::to_string(byte_)) : "") +
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": " + exception::diagnostics(context) + what_arg;
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return {id_, byte_, w.c_str()};
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}
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/*!
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@brief byte index of the parse error
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The byte index of the last read character in the input file.
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@note For an input with n bytes, 1 is the index of the first character and
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n+1 is the index of the terminating null byte or the end of file.
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This also holds true when reading a byte vector (CBOR or MessagePack).
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*/
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const std::size_t byte;
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private:
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parse_error(int id_, std::size_t byte_, const char* what_arg)
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: exception(id_, what_arg), byte(byte_) {}
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static std::string position_string(const position_t& pos)
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{
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return " at line " + std::to_string(pos.lines_read + 1) +
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", column " + std::to_string(pos.chars_read_current_line);
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}
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};
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/// @brief exception indicating errors with iterators
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/// @sa https://json.nlohmann.me/api/basic_json/invalid_iterator/
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class invalid_iterator : public exception
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{
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public:
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template<typename BasicJsonType>
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static invalid_iterator create(int id_, const std::string& what_arg, const BasicJsonType& context)
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{
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std::string w = exception::name("invalid_iterator", id_) + exception::diagnostics(context) + what_arg;
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return {id_, w.c_str()};
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}
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private:
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JSON_HEDLEY_NON_NULL(3)
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invalid_iterator(int id_, const char* what_arg)
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: exception(id_, what_arg) {}
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};
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/// @brief exception indicating executing a member function with a wrong type
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/// @sa https://json.nlohmann.me/api/basic_json/type_error/
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class type_error : public exception
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{
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public:
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template<typename BasicJsonType>
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static type_error create(int id_, const std::string& what_arg, const BasicJsonType& context)
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{
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std::string w = exception::name("type_error", id_) + exception::diagnostics(context) + what_arg;
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return {id_, w.c_str()};
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}
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private:
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JSON_HEDLEY_NON_NULL(3)
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type_error(int id_, const char* what_arg) : exception(id_, what_arg) {}
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};
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/// @brief exception indicating access out of the defined range
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/// @sa https://json.nlohmann.me/api/basic_json/out_of_range/
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class out_of_range : public exception
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{
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public:
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template<typename BasicJsonType>
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static out_of_range create(int id_, const std::string& what_arg, const BasicJsonType& context)
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{
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std::string w = exception::name("out_of_range", id_) + exception::diagnostics(context) + what_arg;
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return {id_, w.c_str()};
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}
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private:
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JSON_HEDLEY_NON_NULL(3)
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out_of_range(int id_, const char* what_arg) : exception(id_, what_arg) {}
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};
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/// @brief exception indicating other library errors
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/// @sa https://json.nlohmann.me/api/basic_json/other_error/
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class other_error : public exception
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{
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public:
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template<typename BasicJsonType>
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static other_error create(int id_, const std::string& what_arg, const BasicJsonType& context)
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{
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std::string w = exception::name("other_error", id_) + exception::diagnostics(context) + what_arg;
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return {id_, w.c_str()};
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}
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private:
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JSON_HEDLEY_NON_NULL(3)
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other_error(int id_, const char* what_arg) : exception(id_, what_arg) {}
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};
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} // namespace detail
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} // namespace nlohmann
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