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#ifndef GFXSCRIPT_INCLUDED // -*- C++ -*-
#define GFXSCRIPT_INCLUDED
#if !defined(__GNUC__)
# pragma once
#endif
/************************************************************************
Simple low-level file format scripting support.
This is the THIRD major revision of this code. It represents a
significant departure from the previous scripting structure.
$Id: script.h 443 2005-06-14 00:53:40Z garland $
************************************************************************/
#include "gfx.h"
#include <vector>
#include <string>
#include <map>
//#include <hash_map>
namespace gfx
{
// Define a set of exceptions that can occur during script parsing
//
namespace script
{
struct Error
{
std::string msg;
Error(const std::string& m) : msg(m) {}
};
struct SyntaxError : public Error
{ SyntaxError(const std::string& m) : Error(m) {} };
struct NameError : public Error
{ NameError(const std::string& m) : Error(m) {} };
struct IOError : public Error
{ IOError(const std::string& m) : Error(m) {} };
}
// These return codes are deprecated and will be going away in the near
// future. Start using the exceptions defined above instead.
enum {
SCRIPT_OK = 0,
SCRIPT_ERR_UNDEF,
SCRIPT_ERR_SYNTAX,
SCRIPT_ERR_UNSUPPORTED,
SCRIPT_ERR_NOFILE,
SCRIPT_END
};
class CmdLine
{
public:
typedef std::string::size_type index_type;
typedef std::pair<index_type, index_type> range_type;
const std::string &line;
range_type op;
std::vector<range_type> tokens;
std::string substr(const range_type& r) const
{ return line.substr(r.first, r.second-r.first);}
std::string token_to_string(int i) const;
double token_to_double(int i) const;
float token_to_float(int i) const;
int token_to_int(int i) const;
std::string rest_to_string(int i) const;
CmdLine(const std::string &l) : line(l) { }
std::string opname() const { return substr(op); }
int argcount() const { return tokens.size(); }
std::string argline() const;
int collect_as_strings(std::vector<std::string> &v, int offset=0) const;
int collect_as_numbers(std::vector<double> &v, int offset=0) const;
int collect_as_numbers(std::vector<int> &v, int offset=0) const;
int collect_as_numbers(double *v, int size, int offset=0) const;
int collect_as_numbers(float *v, int size, int offset=0) const;
int collect_as_numbers(int *v, int size, int offset=0) const;
};
typedef int (*CmdHandler)(const CmdLine&);
struct CmdObject
{
virtual ~CmdObject() {}
virtual int operator()(const CmdLine& cmd) = 0;
};
struct CmdFunction : public CmdObject
{
CmdHandler fn;
CmdFunction(CmdHandler f) { fn=f; }
virtual int operator()(const CmdLine& cmd) { return (*fn)(cmd); }
};
template<class T> struct CmdMethod : public CmdObject
{
typedef int (T::*member_handler)(const CmdLine&);
T *self;
member_handler fn;
CmdMethod(T &obj, member_handler p) { self=&obj; fn=p; }
virtual int operator()(const CmdLine& cmd) { return (self->*fn)(cmd); }
};
template<class T> struct CmdMethod2 : public CmdObject
{
typedef void (T::*member_handler)(const CmdLine&);
T *self;
member_handler fn;
CmdMethod2(T &obj, member_handler p) { self=&obj; fn=p; }
virtual int operator()(const CmdLine& cmd)
{
(self->*fn)(cmd);
return SCRIPT_OK;
}
};
//typedef std::hash_map< std::string, CmdHandler > CmdTable;
typedef std::map< std::string, CmdObject* > CmdTable;
class CmdEnv
{
private:
CmdTable script_commands;
int script_include(const CmdLine&);
int script_ignore(const CmdLine&);
int script_end(const CmdLine&);
int script_eval(const CmdLine&);
std::vector<CmdEnv*> scopes;
public:
CmdEnv();
virtual ~CmdEnv();
void register_command(const std::string& name, CmdObject *fn);
CmdObject *lookup_command(const std::string& name);
void register_command(const std::string& name, CmdHandler proc);
template<class T> inline void register_method(const std::string& name,
T *obj,
int (T::*fn)(const CmdLine&))
{ register_command(name, new CmdMethod<T>(*obj, fn)); }
template<class T> inline void register_method(const std::string& name,
T *obj,
void (T::*fn)(const CmdLine&))
{ register_command(name, new CmdMethod2<T>(*obj, fn)); }
void ignore_command(const std::string& name);
void register_vocabulary(const std::string& name, CmdEnv *env);
void begin_scope(CmdEnv *subenv);
void end_scope();
int do_line(const std::string& line);
int do_stream(std::istream& in);
int do_file(const std::string& filename);
int do_string(const std::string& line);
};
} // namespace gfx
// GFXSCRIPT_INCLUDED
#endif
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