169 lines
3.5 KiB
C++
169 lines
3.5 KiB
C++
#include "json.hh"
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#include <iomanip>
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#include <cstring>
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namespace nix {
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void toJSON(std::ostream & str, const char * start, const char * end)
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{
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str << '"';
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for (auto i = start; i != end; i++)
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if (*i == '\"' || *i == '\\') str << '\\' << *i;
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else if (*i == '\n') str << "\\n";
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else if (*i == '\r') str << "\\r";
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else if (*i == '\t') str << "\\t";
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else if (*i >= 0 && *i < 32)
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str << "\\u" << std::setfill('0') << std::setw(4) << std::hex << (uint16_t) *i << std::dec;
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else str << *i;
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str << '"';
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}
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void toJSON(std::ostream & str, const char * s)
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{
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if (!s) str << "null"; else toJSON(str, s, s + strlen(s));
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}
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template<> void toJSON<int>(std::ostream & str, const int & n) { str << n; }
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template<> void toJSON<unsigned int>(std::ostream & str, const unsigned int & n) { str << n; }
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template<> void toJSON<long>(std::ostream & str, const long & n) { str << n; }
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template<> void toJSON<unsigned long>(std::ostream & str, const unsigned long & n) { str << n; }
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template<> void toJSON<long long>(std::ostream & str, const long long & n) { str << n; }
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template<> void toJSON<unsigned long long>(std::ostream & str, const unsigned long long & n) { str << n; }
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template<> void toJSON<float>(std::ostream & str, const float & n) { str << n; }
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template<> void toJSON<std::string>(std::ostream & str, const std::string & s)
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{
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toJSON(str, s.c_str(), s.c_str() + s.size());
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}
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template<> void toJSON<bool>(std::ostream & str, const bool & b)
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{
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str << (b ? "true" : "false");
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}
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template<> void toJSON<std::nullptr_t>(std::ostream & str, const std::nullptr_t & b)
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{
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str << "null";
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}
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JSONWriter::JSONWriter(std::ostream & str, bool indent)
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: state(new JSONState(str, indent))
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{
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state->stack.push_back(this);
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}
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JSONWriter::JSONWriter(JSONState * state)
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: state(state)
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{
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state->stack.push_back(this);
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}
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JSONWriter::~JSONWriter()
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{
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assertActive();
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state->stack.pop_back();
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if (state->stack.empty()) delete state;
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}
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void JSONWriter::comma()
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{
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assertActive();
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if (first) {
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first = false;
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} else {
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state->str << ',';
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}
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if (state->indent) indent();
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}
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void JSONWriter::indent()
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{
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state->str << '\n' << std::string(state->depth * 2, ' ');
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}
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void JSONList::open()
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{
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state->depth++;
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state->str << '[';
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}
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JSONList::~JSONList()
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{
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state->depth--;
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if (state->indent && !first) indent();
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state->str << "]";
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}
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JSONList JSONList::list()
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{
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comma();
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return JSONList(state);
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}
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JSONObject JSONList::object()
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{
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comma();
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return JSONObject(state);
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}
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JSONPlaceholder JSONList::placeholder()
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{
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comma();
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return JSONPlaceholder(state);
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}
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void JSONObject::open()
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{
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state->depth++;
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state->str << '{';
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}
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JSONObject::~JSONObject()
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{
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state->depth--;
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if (state->indent && !first) indent();
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state->str << "}";
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}
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void JSONObject::attr(const std::string & s)
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{
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comma();
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toJSON(state->str, s);
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state->str << ':';
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if (state->indent) state->str << ' ';
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}
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JSONList JSONObject::list(const std::string & name)
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{
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attr(name);
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return JSONList(state);
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}
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JSONObject JSONObject::object(const std::string & name)
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{
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attr(name);
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return JSONObject(state);
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}
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JSONPlaceholder JSONObject::placeholder(const std::string & name)
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{
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attr(name);
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return JSONPlaceholder(state);
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}
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JSONList JSONPlaceholder::list()
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{
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assertValid();
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first = false;
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return JSONList(state);
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}
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JSONObject JSONPlaceholder::object()
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{
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assertValid();
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first = false;
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return JSONObject(state);
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}
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}
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