json_reader.h

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#ifndef ED_IO_JSON_READER_H_
#define ED_IO_JSON_READER_H_
 
#include "ed/io/reader.h"
#include "ed/io/data.h"
 
#include <sstream>
#include <vector>
 
namespace ed
{
 
namespace io
{
 
class JSONReader : public ed::io::Reader
{
 
public:
 
    JSONReader(const char* s);
 
    virtual ~JSONReader();
 
    bool readGroup(const std::string& name);
    bool endGroup();
 
    bool readArray(const std::string& name);
    bool endArray();
 
    bool nextArrayItem();
 
    bool readValue(const std::string&, float& f);
    bool readValue(const std::string&, double& d);
    bool readValue(const std::string&, int& i);
    bool readValue(const std::string&, std::string& s);
 
    bool ok() { return error_.empty(); }
 
    std::string error() { return error_; }
 
private:
 
    Data data_;
    Node n_current_;
    std::vector<unsigned int> array_index_stack_;
 
    std::string error_;
 
    template<typename T>
    bool value(const std::string& key, T& value) const
    {
        const std::map<std::string, Node>& map = data_.maps[n_current_.idx];
        std::map<std::string, Node>::const_iterator it = map.find(key);
        if (it == map.end())
            return false;
 
        const Variant& v = data_.values[it->second.idx];
 
        if (!v.getValue(value))
            return false;
 
        return true;
    }
 
};
 
}
 
}
 
#endif