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#ifndef __EXPRESSION_H_
#define __EXPRESSION_H_
#include <grass/calc.h>
struct expr_list;
typedef enum expr_t {
expr_type_constant,
expr_type_variable,
expr_type_map,
expr_type_function,
expr_type_binding
} expr_t;
typedef union expr_data_const {
int ival;
double fval;
} expr_data_const;
typedef struct expr_data_var {
const char *name;
struct expression *bind;
} expr_data_var;
typedef struct expr_data_map {
const char *name;
int mod;
int row, col, depth;
int idx;
} expr_data_map;
typedef struct expr_data_func {
const char *name;
const char *oper;
int prec;
func_t *func;
int argc;
struct expression **args;
int *argt;
void **argv;
} expr_data_func;
typedef struct expr_data_bind {
const char *var;
struct expression *val;
int fd;
} expr_data_bind;
typedef struct expression {
int type;
int res_type;
void *buf;
union {
expr_data_const con;
expr_data_var var;
expr_data_map map;
expr_data_func func;
expr_data_bind bind;
} data;
void *worker;
} expression;
typedef struct expr_list {
expression *exp;
struct expr_list *next;
} expr_list;
extern int list_length(expr_list *l);
extern void define_variable(expression *e);
extern char *composite(const char *name, const char *mapset);
extern expr_list *list(expression *exp, expr_list *next);
extern expr_list *singleton(expression *e1);
extern expr_list *pair(expression *e1, expression *e2);
extern expr_list *triple(expression *e1, expression *e2, expression *e3);
extern expression *constant_int(int x);
extern expression *constant_float(float x);
extern expression *constant_double(double x);
extern expression *variable(const char *name);
extern expression *mapname(const char *name, int mod, int row, int col,
int depth);
extern expression *operator(const char *name, const char *oper, int prec,
expr_list *args);
extern expression *function(const char *name, expr_list *args);
extern expression *binding(const char *var, expression *val);
extern func_desc local_func_descs[];
#endif /* __EXPRESSION_H_ */
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