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//-----------------------------------------------------------------------------
/** @file libboardgame_base/Reader.h
@author Markus Enzenberger
@copyright GNU General Public License version 3 or later */
//-----------------------------------------------------------------------------
#ifndef LIBBOARDGAME_BASE_READER_H
#define LIBBOARDGAME_BASE_READER_H
#include <iosfwd>
#include <stdexcept>
#include <string>
#include <vector>
namespace libboardgame_base {
using namespace std;
//-----------------------------------------------------------------------------
class Reader
{
public:
class ReadError
: public runtime_error
{
using runtime_error::runtime_error;
};
virtual ~Reader() = default;
virtual void on_begin_tree(bool is_root);
virtual void on_end_tree(bool is_root);
virtual void on_begin_node(bool is_root);
virtual void on_end_node();
virtual void on_property(const string& id, const vector<string>& values);
/** Read a game tree from a stream.
@param in The input stream containing the SGF game tree(s).
@param check_single_tree If true, the caller does not want to
handle multi-tree SGF files and a ReadError will be thrown if
non-whitespace characters follow after the first tree before the end of
the stream.
@return true, if there are more trees to read in the stream.
@throws ReadError */
bool read(istream& in, bool check_single_tree = true);
void read(const string& file);
private:
istream* m_in;
/** Local variable in read_property().
Reused for efficiency. */
string m_id;
/** Local variable in read_property().
Reused for efficiency. */
string m_value;
/** Local variable in read_property().
Reused for efficiency. */
vector<string> m_values;
void consume_char(char expected);
void consume_whitespace();
char peek();
char read_char();
void read_expected(char expected);
void read_node(bool is_root);
void read_property();
void read_tree(bool is_root);
};
//-----------------------------------------------------------------------------
} // namespace libboardgame_base
#endif // LIBBOARDGAME_BASE_READER_H
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