/*
 * Module for handling variables in QEmacs
 *
 * Copyright (c) 2000-2017 Charlie Gordon.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef QE_VARIABLES_H
#define QE_VARIABLES_H

typedef enum QVarType {
    VAR_UNKNOWN = 0,
    VAR_NUMBER,
    VAR_STRING,
    VAR_CHARS,
    VAR_READONLY,
    VAR_INVALID,
} QVarType;

enum QVarAccess {
    VAR_RO,
    VAR_RW,
    VAR_RW_SAVE,
};

enum QVarDomain {
    VAR_GLOBAL,
    VAR_STATE,
    VAR_BUFFER,
    VAR_WINDOW,
    VAR_MODE,
    VAR_SELF,
};

extern const char * const var_domain[];

typedef struct VarDef VarDef;
struct VarDef {
    const char *name;
    unsigned int modified : 1;
    enum QVarDomain domain : 4;
    enum QVarType type : 4;
    enum QVarAccess rw : 2;
    unsigned int size : 16;
    union {
        void *ptr;
        int offset;
        char **pstr;
        int *pint;
        char *str;
        int num;
    } value;
    QVarType (*set_value)(EditState *s, VarDef *vp, void *ptr,
                          const char *str, int num);
    VarDef *next;
};

#define U_VAR_F(name, type, fun) \
    { (name), 0, VAR_SELF, type, VAR_RW, 0, { .num = 0 }, fun, NULL },
#define G_VAR_F(name, var, type, rw, fun) \
    { (name), 0, VAR_GLOBAL, type, rw, 0, \
      { .ptr = (void*)&(var) }, fun, NULL },
#define S_VAR_F(name, fld, type, rw, fun) \
    { (name), 0, VAR_STATE, type, rw, sizeof(((QEmacsState*)0)->fld), \
      { .offset = offsetof(QEmacsState, fld) }, fun, NULL },
#define B_VAR_F(name, fld, type, rw, fun) \
    { (name), 0, VAR_BUFFER, type, rw, sizeof(((EditBuffer*)0)->fld), \
      { .offset = offsetof(EditBuffer, fld) }, fun, NULL },
#define W_VAR_F(name, fld, type, rw, fun) \
    { (name), 0, VAR_WINDOW, type, rw, sizeof(((EditState*)0)->fld), \
      { .offset = offsetof(EditState, fld) }, fun, NULL },
#define M_VAR_F(name, fld, type, rw, fun) \
    { (name), 0, VAR_MODE, type, rw, sizeof(((ModeDef*)0)->fld), \
      { .offset = offsetof(ModeDef, fld) }, fun, NULL },

#define U_VAR(name,type)         U_VAR_F(name, type, NULL)
#define G_VAR(name,var,type,rw)  G_VAR_F(name, var, type, rw, NULL)
#define S_VAR(name,fld,type,rw)  S_VAR_F(name, fld, type, rw, NULL)
#define B_VAR(name,fld,type,rw)  B_VAR_F(name, fld, type, rw, NULL)
#define W_VAR(name,fld,type,rw)  W_VAR_F(name, fld, type, rw, NULL)
#define M_VAR(name,fld,type,rw)  M_VAR_F(name, fld, type, rw, NULL)

void qe_register_variables(VarDef *vars, int count);
VarDef *qe_find_variable(const char *name);
void qe_complete_variable(CompleteState *cp);

QVarType qe_get_variable(EditState *s, const char *name,
                         char *buf, int size, int *pnum, int as_source);
QVarType qe_set_variable(EditState *s, const char *name,
                         const char *value, int num);

void qe_list_variables(EditState *s, EditBuffer *b);

void do_set_variable(EditState *s, const char *name, const char *value);
void do_show_variable(EditState *s, const char *name);
void qe_save_variables(EditState *s, EditBuffer *b);

#endif  /* QE_VARIABLES_H */