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🚑 fixed error in callback logic

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Niels Lohmann 2018-05-06 19:00:49 +02:00
parent ae213721b1
commit e94862a649
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GPG key ID: 7F3CEA63AE251B69
2 changed files with 33 additions and 32 deletions
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23
include/nlohmann/detail/input/json_sax.hpp
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@ -349,10 +349,10 @@ class json_sax_dom_callback_parser : public json_sax<BasicJsonType>
bool start_object(std::size_t len) override
{
// check callback for object start
const bool keep = callback(static_cast<int>(ref_stack.size()) + 1, parse_event_t::object_start, discarded);
const bool keep = callback(static_cast<int>(ref_stack.size()), parse_event_t::object_start, discarded);
keep_stack.push_back(keep);
auto val = handle_value(BasicJsonType::value_t::object);
auto val = handle_value(BasicJsonType::value_t::object, true);
ref_stack.push_back(val.second);
// check object limit
@ -424,10 +424,10 @@ class json_sax_dom_callback_parser : public json_sax<BasicJsonType>
bool start_array(std::size_t len) override
{
const bool keep = callback(static_cast<int>(ref_stack.size()) + 1, parse_event_t::array_start, discarded);
const bool keep = callback(static_cast<int>(ref_stack.size()), parse_event_t::array_start, discarded);
keep_stack.push_back(keep);
auto val = handle_value(BasicJsonType::value_t::array);
auto val = handle_value(BasicJsonType::value_t::array, true);
ref_stack.push_back(val.second);
// check array limit
@ -507,15 +507,22 @@ class json_sax_dom_callback_parser : public json_sax<BasicJsonType>
private:
/*!
@param[in] v value to add to the JSON value we build during parsing
@param[in] skip_callback whether we should skip calling the callback
function; this is required after start_array() and
start_object() SAX events, because otherwise we would call the
callback function with an empty array or object, respectively.
@invariant If the ref stack is empty, then the passed value will be the new
root.
@invariant If the ref stack contains a value, then it is an array or an
object to which we can add elements
@return pair of boolean (whether value should be kept) and pointer (to the
passed value in the ref_stack hierarchy; nullptr if not kept)
*/
template<typename Value>
std::pair<bool, BasicJsonType*> handle_value(Value&& v)
std::pair<bool, BasicJsonType*> handle_value(Value&& v, const bool skip_callback = false)
{
assert(not keep_stack.empty());
@ -526,9 +533,11 @@ class json_sax_dom_callback_parser : public json_sax<BasicJsonType>
return {false, nullptr};
}
// create value and check callback
// create value
auto value = BasicJsonType(std::forward<Value>(v));
const bool keep = callback(static_cast<int>(ref_stack.size()), parse_event_t::value, value);
// check callback
const bool keep = skip_callback or callback(static_cast<int>(ref_stack.size()), parse_event_t::value, value);
// do not handle this value if we just learnt it shall be discarded
if (not keep)