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json2xml.hpp
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json2xml.hpp
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/*
________________________________________________
| _ ___ _ |
| (_) |__ \ | | |
| _ ___ ___ _ __ ) |_ ___ __ ___ | | |
| | / __|/ _ \| '_ \ / /\ \/ / '_ ` _ \| | | Json-to-xml C++ only-header library
| | \__ \ (_) | | | |/ /_ > <| | | | | | | | Version 1.0.0
| | |___/\___/|_| |_|____/_/\_\_| |_| |_|_| | https://github.com/testillano/json2xml
| _/ | |
| |__/ |
|_______________________________________________|
Licensed under the MIT License <http://opensource.org/licenses/MIT>.
SPDX-License-Identifier: MIT
Copyright (c) 2020 Eduardo Ramos
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.
*/
#ifndef ERT_JSONSAXCONSUMER_H_
#define ERT_JSONSAXCONSUMER_H_
// Standard
#include <iomanip>
#include <sstream>
#include <stack>
// Nlohmann (https://github.com/nlohmann/json)
#include <nlohmann/json.hpp>
namespace ert {
class JsonSaxConsumer : public nlohmann::json::json_sax_t
{
// private members
int tab_spaces_;
char attr_prefix_;
bool has_attributes_;
int indent_;
std::stringstream result_;
std::stringstream current_object_;
std::stack<std::string> nodes_stack_;
std::string key_;
// private functions
const std::string & get_top() {
return nodes_stack_.top();
}
public:
/**
* Default constructor
*
* @param tabSpaces Indentation spaces for xml representation, 4 by default. Must be >= 1 or 4 will be asigned.
* @param attrPrefix You could set any other value for attribute prefix, '@' by default.
*/
JsonSaxConsumer(int tabSpaces = 4, char attrPrefix = '@'):
tab_spaces_(tabSpaces>=1 ? tabSpaces:4),
attr_prefix_(attrPrefix),
has_attributes_(false),
indent_(-tab_spaces_) {};
/**
* Returns the resulting xml stringstream representation
*/
const std::stringstream & getXmlStream() const {
return result_;
}
/**
* Returns the resulting xml string representation
*/
std::string getXmlString() const {
return result_.str();
}
// nlohmann sax virtual methods
bool null() override
{
current_object_ << "<null>";
has_attributes_ = true;
return true;
}
bool boolean(bool val) override
{
current_object_ << std::quoted(val ? "true" : "false");
has_attributes_ = true;
return true;
}
bool number_integer(number_integer_t val) override
{
current_object_ << std::quoted(std::to_string(val));
has_attributes_ = true;
return true;
}
bool number_unsigned(number_unsigned_t val) override
{
current_object_ << std::quoted(std::to_string(val));
has_attributes_ = true;
return true;
}
bool number_float(number_float_t val, const string_t& s) override
{
current_object_ << std::quoted(s);
has_attributes_ = true;
return true;
}
bool string(string_t& val) override
{
current_object_ << std::quoted(val);
has_attributes_ = true;
return true;
}
bool binary(binary_t& val) override
{
current_object_ << std::quoted("binary"); // TODO
has_attributes_ = true;
return true;
}
bool start_object(std::size_t elements) override
{
if (key_ == "") return true; // global object condition (first start object)
nodes_stack_.push(key_); // push on starts
indent_ += tab_spaces_; // increase indentation on object start
if (indent_ != 0) {
// New object when previous hadn't attributes:
if (current_object_.str().empty() && !has_attributes_) result_ <<">";
result_ << "\n";
}
result_ << std::string(indent_, ' ') << "<" << get_top();
has_attributes_ = false;
return true;
}
bool end_object() override
{
if (indent_ < 0) return true;
if (current_object_.str().empty()) {
result_ << "\n" << std::string(indent_, ' ') << "</" << get_top() << ">";
}
else {
result_ << current_object_.str() << "/>";
current_object_.str("");
}
nodes_stack_.pop(); // pop on ends
indent_ -= tab_spaces_; // decrease indentation on object end
return true;
}
bool start_array(std::size_t elements) override
{
nodes_stack_.push(key_); // push on starts
result_ << current_object_.str();
current_object_.str("");
has_attributes_ = false;
return true;
}
bool end_array() override
{
nodes_stack_.pop(); // pop on ends
return true;
}
bool key(string_t& val) override
{
if (val[0] != attr_prefix_) {
key_ = val;
}
else {
current_object_ << " " << val.substr(1) << "=";
}
return true;
}
bool parse_error(std::size_t position, const std::string& last_token, const nlohmann::json::exception& ex) override
{
result_ << std::string(ex.what());
return false;
}
};
}
#endif