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🔨 added SAX-DOM-Parser

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This commit is contained in:
Niels Lohmann
2018-03-05 21:06:00 +01:00
parent 9d27429527
commit 5b9d03cfdb
5 changed files with 325 additions and 124 deletions
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125
test/src/unit-class_parser.cpp
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@ -134,129 +134,6 @@ class SaxEventLogger : public nlohmann::json::json_sax_t
bool errored = false;
};
class SaxDomParser : public nlohmann::json::json_sax_t
{
public:
bool null() override
{
handle_value(nullptr);
return true;
}
bool boolean(bool val) override
{
handle_value(val);
return true;
}
bool number_integer(json::number_integer_t val) override
{
handle_value(val);
return true;
}
bool number_unsigned(json::number_unsigned_t val) override
{
handle_value(val);
return true;
}
bool number_float(json::number_float_t val, const std::string&) override
{
handle_value(val);
return true;
}
bool string(std::string&& val) override
{
handle_value(val);
return true;
}
bool start_object(std::size_t) override
{
ref_stack.push_back(handle_value(json::value_t::object));
return true;
}
bool key(std::string&& val) override
{
last_key = val;
return true;
}
bool end_object() override
{
ref_stack.pop_back();
return true;
}
bool start_array(std::size_t) override
{
ref_stack.push_back(handle_value(json::value_t::array));
return true;
}
bool end_array() override
{
ref_stack.pop_back();
return true;
}
bool binary(const std::vector<uint8_t>&) override
{
return true;
}
bool parse_error(std::size_t position, const std::string&, const std::string&) override
{
return false;
}
json& get_value()
{
return root;
}
private:
/// the parsed JSON value
json root;
/// stack to model hierarchy of values
std::vector<json*> ref_stack;
/// helper variable for object keys
std::string last_key;
/*!
@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
*/
json* handle_value(json&& j)
{
if (ref_stack.empty())
{
assert(root.is_null());
root = j;
return &root;
}
else
{
assert(ref_stack.back()->is_array() or ref_stack.back()->is_object());
if (ref_stack.back()->is_array())
{
ref_stack.back()->push_back(j);
return &(ref_stack.back()->back());
}
else
{
json& r = ref_stack.back()->operator[](last_key) = j;
return &r;
}
}
}
};
json parser_helper(const std::string& s);
bool accept_helper(const std::string& s);
@ -271,7 +148,7 @@ json parser_helper(const std::string& s)
CHECK_NOTHROW(json::parser(nlohmann::detail::input_adapter(s), nullptr, false).parse(true, j_nothrow));
CHECK(j_nothrow == j);
SaxDomParser sdp;
nlohmann::json_sax_dom_parser<json> sdp;
json::sax_parse(s, &sdp);
CHECK(sdp.get_value() == j);