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/// Copyright 2013-2025 Daniel Parker
// Distributed under the Boost license, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See https://github.com/danielaparker/jsoncons for latest version
#ifndef JSONCONS_EXT_JSONPATH_JSONPATH_ERROR_HPP
#define JSONCONS_EXT_JSONPATH_JSONPATH_ERROR_HPP
#include <cstddef>
#include <string>
#include <system_error>
#include <type_traits>
#include <jsoncons/config/compiler_support.hpp>
#include <jsoncons/json_exception.hpp>
namespace jsoncons { namespace jsonpath {
enum class jsonpath_errc
{
success = 0,
expected_root_or_current_node,
expected_lbracket_or_dot,
expected_single_quote_or_digit,
expected_root_or_function,
expected_current_node,
expected_rparen,
expected_rbracket,
expected_separator,
expected_forward_slash,
expected_slice_start,
expected_slice_end,
expected_slice_step,
expected_bracket_specifier_or_union,
unexpected_operator,
invalid_function_name,
invalid_argument,
invalid_arity,
function_name_not_found,
parse_error_in_filter,
argument_parse_error,
unidentified_error,
unexpected_eof,
expected_colon_dot_left_bracket_comma_or_rbracket,
argument_to_unflatten_invalid,
invalid_flattened_key,
step_cannot_be_zero,
invalid_number,
illegal_escaped_character,
invalid_codepoint,
unknown_function,
invalid_type,
unbalanced_parentheses,
syntax_error,
expected_comparator,
expected_or,
expected_and,
expected_comma_or_rparen,
expected_comma_or_rbracket,
expected_relative_path
};
class jsonpath_error_category_impl
: public std::error_category
{
public:
const char* name() const noexcept override
{
return "jsoncons/jsonpath";
}
std::string message(int ev) const override
{
switch (static_cast<jsonpath_errc>(ev))
{
case jsonpath_errc::expected_root_or_current_node:
return "Expected '$' or '@'";
case jsonpath_errc::expected_lbracket_or_dot:
return "Expected '[' or '.'";
case jsonpath_errc::expected_single_quote_or_digit:
return "Expected '\'' or digit";
case jsonpath_errc::expected_root_or_function:
return "Expected '$' or function expression";
case jsonpath_errc::expected_current_node:
return "Expected @";
case jsonpath_errc::expected_rbracket:
return "Expected ]";
case jsonpath_errc::expected_rparen:
return "Expected )";
case jsonpath_errc::expected_slice_start:
return "Expected slice start";
case jsonpath_errc::expected_slice_end:
return "Expected slice end";
case jsonpath_errc::expected_slice_step:
return "Expected slice step";
case jsonpath_errc::expected_separator:
return "Expected dot or left bracket separator";
case jsonpath_errc::expected_forward_slash:
return "Invalid path filter, expected '/'";
case jsonpath_errc::expected_bracket_specifier_or_union:
return "Expected index, single or double quoted name, expression, filter, absolute ('$') path or relative ('@') path";
case jsonpath_errc::invalid_function_name:
return "Invalid function name";
case jsonpath_errc::invalid_argument:
return "Invalid argument type";
case jsonpath_errc::invalid_arity:
return "Incorrect number of arguments";
case jsonpath_errc::function_name_not_found:
return "Function name not found";
case jsonpath_errc::parse_error_in_filter:
return "Could not parse JSON expression in a JSONPath filter";
case jsonpath_errc::argument_parse_error:
return "Could not parse JSON expression passed to JSONPath function";
case jsonpath_errc::unidentified_error:
return "Unidentified error";
case jsonpath_errc::unexpected_eof:
return "Unexpected EOF while parsing jsonpath expression";
case jsonpath_errc::expected_colon_dot_left_bracket_comma_or_rbracket:
return "Expected ':', '.', '[', ',', or ']'";
case jsonpath_errc::argument_to_unflatten_invalid:
return "Argument to unflatten must be an object";
case jsonpath_errc::invalid_flattened_key:
return "Flattened key is invalid";
case jsonpath_errc::step_cannot_be_zero:
return "Slice step cannot be zero";
case jsonpath_errc::invalid_number:
return "Invalid number";
case jsonpath_errc::illegal_escaped_character:
return "Illegal escaped character";
case jsonpath_errc::invalid_codepoint:
return "Invalid codepoint";
case jsonpath_errc::unknown_function:
return "Unknown function";
case jsonpath_errc::invalid_type:
return "Invalid type";
case jsonpath_errc::unbalanced_parentheses:
return "Unbalanced parentheses";
case jsonpath_errc::syntax_error:
return "Syntax error";
case jsonpath_errc::expected_comparator:
return "Expected comparator";
case jsonpath_errc::expected_or:
return "Expected operator '||'";
case jsonpath_errc::expected_and:
return "Expected operator '&&'";
case jsonpath_errc::expected_comma_or_rparen:
return "Expected comma or right parenthesis";
case jsonpath_errc::expected_comma_or_rbracket:
return "Expected comma or right bracket";
case jsonpath_errc::expected_relative_path:
return "Expected unquoted string, or single or double quoted string, or index or '*'";
default:
return "Unknown jsonpath parser error";
}
}
};
inline
const std::error_category& jsonpath_error_category()
{
static jsonpath_error_category_impl instance;
return instance;
}
inline
std::error_code make_error_code(jsonpath_errc result)
{
return std::error_code(static_cast<int>(result),jsonpath_error_category());
}
} // namespace jsonpath
} // namespace jsoncons
namespace std {
template<>
struct is_error_code_enum<jsoncons::jsonpath::jsonpath_errc> : public true_type
{
};
} // namespace std
namespace jsoncons { namespace jsonpath {
class jsonpath_error : public std::system_error, public virtual json_exception
{
std::size_t line_number_{0};
std::size_t column_number_{0};
mutable std::string what_;
public:
jsonpath_error(std::error_code ec)
: std::system_error(ec)
{
}
jsonpath_error(std::error_code ec, const std::string& what_arg)
: std::system_error(ec, what_arg)
{
}
jsonpath_error(std::error_code ec, std::size_t position)
: std::system_error(ec), column_number_(position)
{
}
jsonpath_error(std::error_code ec, std::size_t line, std::size_t column)
: std::system_error(ec), line_number_(line), column_number_(column)
{
}
jsonpath_error(const jsonpath_error& other) = default;
jsonpath_error(jsonpath_error&& other) = default;
~jsonpath_error() override = default;
const char* what() const noexcept override
{
if (what_.empty())
{
JSONCONS_TRY
{
what_.append(std::system_error::what());
if (line_number_ != 0 && column_number_ != 0)
{
what_.append(" at line ");
what_.append(std::to_string(line_number_));
what_.append(" and column ");
what_.append(std::to_string(column_number_));
}
else if (column_number_ != 0)
{
what_.append(" at position ");
what_.append(std::to_string(column_number_));
}
return what_.c_str();
}
JSONCONS_CATCH(...)
{
return std::system_error::what();
}
}
else
{
return what_.c_str();
}
}
std::size_t line() const noexcept
{
return line_number_;
}
std::size_t column() const noexcept
{
return column_number_;
}
};
} // namespace jsonpath
} // namespace jsoncons
#endif // JSONCONS_EXT_JSONPATH_JSONPATH_ERROR_HPP
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