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#include "json.h"
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/fusion/include/std_pair.hpp>
namespace qi = boost::spirit::qi;
using namespace JSON;
bool JSON::parse(const std::string& s, Value& v) {
typedef std::string::const_iterator Iterator;
qi::rule<Iterator, bool()> bool_p = qi::lit("false")[qi::_val = false] | qi::lit("true")[qi::_val = true];
qi::rule<Iterator, boost::variant<int, float>()> number_p = (qi::int_ >> !(qi::lit('.') | 'e' | 'E')) | qi::float_;
qi::rule<Iterator, char()> char_p = (qi::char_ - '\"' - '\\') | '\\' >> (
qi::char_('\"') |
qi::char_('\\') |
qi::char_('/') |
'b' >> qi::attr('\b') |
'f' >> qi::attr('\f') |
'n' >> qi::attr('\n') |
'r' >> qi::attr('\r') |
't' >> qi::attr('\t')
);
qi::rule<Iterator, std::string()> string_p = '\"' >> *(char_p) >> '\"';
qi::rule<Iterator, Value()> value_p;
qi::rule<Iterator, Array()> array_p = '[' >> -(value_p % ',') >> ']';
qi::rule<Iterator, std::pair<std::string, Value>()> key_value_p = string_p >> ":" >> value_p;
qi::rule<Iterator, Object()> object_p = '{' >> -(key_value_p % ',') >> '}';
value_p = qi::omit[*qi::space] >> (bool_p | number_p | string_p | array_p | object_p) >> qi::omit[*qi::space];
return qi::parse(s.begin(), s.end(), value_p, v);
}
struct generate : public boost::static_visitor<std::ostream&> {
std::ostream& stream;
generate(std::ostream& s) : stream(s) {}
std::ostream& operator()(const bool& x) const {
return stream << (x ? "true" : "false");
}
std::ostream& operator()(const int& x) const {
return stream << x;
}
std::ostream& operator()(const float& x) const {
return stream << x;
}
std::ostream& operator()(const std::string& x) const {
stream << '\"';
for(std::string::const_iterator it = x.begin(); it != x.end(); it++) {
switch(*it) {
case '\"':
case '\\':
stream << '\\' << *it;
break;
case '\b':
stream << "\\b";
break;
case '\f':
stream << "\\f";
break;
case '\n':
stream << "\\n";
break;
case '\r':
stream << "\\r";
break;
case '\t':
stream << "\\t";
break;
default:
stream << *it;
}
}
return stream << '\"';
}
std::ostream& operator()(const Array& x) const {
stream << "[";
for(Array::const_iterator it = x.begin();;) {
boost::apply_visitor(generate(stream), *it);
if(++it == x.end()) {
break;
}
stream << ", ";
}
return stream << "]";
}
std::ostream& operator()(const Object& x) const {
stream << "{";
for(Object::const_iterator it = x.begin();;) {
(*this)(it->first);
stream << ": ";
boost::apply_visitor(generate(stream), it->second);
if(++it == x.end()) {
break;
}
stream << ", ";
}
return stream << "}";
}
};
std::ostream& operator<<(std::ostream& s, const Value& v) {
return boost::apply_visitor(generate(s), v);
}
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