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started implementing JSON Patch (RFC 6902)

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Niels
2016-04-18 22:41:36 +02:00
parent 3ca1bfdd9d
commit 70fc5835cb
3 changed files with 416 additions and 0 deletions
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95
src/json.hpp
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@ -9492,6 +9492,101 @@ basic_json_parser_63:
}
/// @}
/*!
@brief applies a JSON patch
@param[in] patch JSON patch document
@return patched document
@note The original JSON value is not changed; that is, the patch is
applied to a copy of the value.
@sa [RFC 6902](https://tools.ietf.org/html/rfc6902)
*/
basic_json apply_patch(const basic_json& patch) const
{
basic_json result = *this;
if (not patch.is_array())
{
// a JSON patch must be an array of objects
throw std::domain_error("JSON patch must be an array of objects");
}
for (const auto& val : patch)
{
if (not val.is_object())
{
throw std::domain_error("JSON patch must be an array of objects");
}
// collect members
const auto it_op = val.m_value.object->find("op");
const auto it_path = val.m_value.object->find("path");
const auto it_value = val.m_value.object->find("value");
if (it_op == val.m_value.object->end() or not it_op->second.is_string())
{
throw std::domain_error("operation must have a string 'op' member");
}
if (it_path == val.m_value.object->end() or not it_op->second.is_string())
{
throw std::domain_error("operation must have a string 'path' member");
}
const std::string op = it_op->second;
const std::string path = it_path->second;
const json_pointer ptr(path);
if (op == "add")
{
if (it_value == val.m_value.object->end())
{
throw std::domain_error("'add' operation must have member 'value'");
}
result[ptr] = it_value->second;
}
else if (op == "remove")
{
}
else if (op == "replace")
{
if (it_value == val.m_value.object->end())
{
throw std::domain_error("'replace' operation must have member 'value'");
}
}
else if (op == "move")
{
}
else if (op == "copy")
{
}
else if (op == "test")
{
if (it_value == val.m_value.object->end())
{
throw std::domain_error("'test' operation must have member 'value'");
}
if (result.at(ptr) != it_value->second)
{
throw std::domain_error("unsuccessful: " + val.dump());
}
}
else
{
// op must be "add", "remove", "replace", "move",
// "copy", or "test"
throw std::domain_error("operation value '" + op + "' is invalid");
}
}
return result;
}
};