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/*
generic s-exp evaluator class
*/
#ifndef _E_SEXP_H
#define _E_SEXP_H
#include <setjmp.h>
#include <time.h>
#include <glib.h>
#ifdef E_SEXP_IS_GTK_OBJECT
#include <gtk/gtkobject.h>
#endif
#ifdef E_SEXP_IS_GTK_OBJECT
#define E_SEXP(obj) GTK_CHECK_CAST (obj, e_sexp_get_type (), ESExp)
#define E_SEXP_CLASS(klass) GTK_CHECK_CLASS_CAST (klass, e_sexp_get_type (), ESExpClass)
#define FILTER_IS_SEXP(obj) GTK_CHECK_TYPE (obj, e_sexp_get_type ())
#else
#define E_SEXP(obj) ((struct _ESExp *)(obj))
#define E_SEXP_CLASS(klass) ((struct _ESExpClass *)(klass))
#define FILTER_IS_SEXP(obj) (1)
#endif
typedef struct _ESExp ESExp;
typedef struct _ESExpClass ESExpClass;
typedef struct _ESExpSymbol ESExpSymbol;
typedef struct _ESExpResult ESExpResult;
typedef struct _ESExpTerm ESExpTerm;
typedef struct _ESExpResult *(ESExpFunc)(struct _ESExp *sexp,
int argc,
struct _ESExpResult **argv,
void *data);
typedef struct _ESExpResult *(ESExpIFunc)(struct _ESExp *sexp,
int argc,
struct _ESExpTerm **argv,
void *data);
enum _ESExpResultType {
ESEXP_RES_ARRAY_PTR=0, /* type is a ptrarray, what it points to is implementation dependant */
ESEXP_RES_INT, /* type is a number */
ESEXP_RES_STRING, /* type is a pointer to a single string */
ESEXP_RES_BOOL, /* boolean type */
ESEXP_RES_TIME, /* time_t type */
ESEXP_RES_UNDEFINED /* unknown type */
};
struct _ESExpResult {
enum _ESExpResultType type;
union {
GPtrArray *ptrarray;
int number;
char *string;
int bool;
time_t time;
} value;
};
enum _ESExpTermType {
ESEXP_TERM_INT = 0, /* integer literal */
ESEXP_TERM_BOOL, /* boolean literal */
ESEXP_TERM_STRING, /* string literal */
ESEXP_TERM_TIME, /* time_t literal (number of seconds past the epoch) */
ESEXP_TERM_FUNC, /* normal function, arguments are evaluated before calling */
ESEXP_TERM_IFUNC, /* immediate function, raw terms are arguments */
ESEXP_TERM_VAR, /* variable reference */
};
struct _ESExpSymbol {
int type; /* ESEXP_TERM_FUNC or ESEXP_TERM_VAR */
char *name;
void *data;
union {
ESExpFunc *func;
ESExpIFunc *ifunc;
} f;
};
struct _ESExpTerm {
enum _ESExpTermType type;
union {
char *string;
int number;
int bool;
time_t time;
struct {
struct _ESExpSymbol *sym;
struct _ESExpTerm **terms;
int termcount;
} func;
struct _ESExpSymbol *var;
} value;
};
struct _ESExp {
#ifdef E_SEXP_IS_GTK_OBJECT
GtkObject object;
#else
int refcount;
#endif
GScanner *scanner; /* for parsing text version */
ESExpTerm *tree; /* root of expression tree */
/* private stuff */
jmp_buf failenv;
char *error;
/* TODO: may also need a pool allocator for term strings, so we dont lose them
in error conditions? */
struct _EMemChunk *term_chunks;
struct _EMemChunk *result_chunks;
};
struct _ESExpClass {
#ifdef E_SEXP_IS_GTK_OBJECT
GtkObjectClass parent_class;
#endif
};
#ifdef E_SEXP_IS_GTK_OBJECT
guint e_sexp_get_type (void);
#endif
ESExp *e_sexp_new (void);
#ifndef E_SEXP_IS_GTK_OBJECT
void e_sexp_ref (ESExp *f);
void e_sexp_unref (ESExp *f);
#endif
void e_sexp_add_function (ESExp *f, int scope, char *name, ESExpFunc *func, void *data);
void e_sexp_add_ifunction (ESExp *f, int scope, char *name, ESExpIFunc *func, void *data);
void e_sexp_add_variable (ESExp *f, int scope, char *name, ESExpTerm *value);
void e_sexp_remove_symbol (ESExp *f, int scope, char *name);
int e_sexp_set_scope (ESExp *f, int scope);
void e_sexp_input_text (ESExp *f, const char *text, int len);
void e_sexp_input_file (ESExp *f, int fd);
int e_sexp_parse (ESExp *f);
ESExpResult *e_sexp_eval (ESExp *f);
ESExpResult *e_sexp_term_eval (struct _ESExp *f, struct _ESExpTerm *t);
ESExpResult *e_sexp_result_new (struct _ESExp *f, int type);
void e_sexp_result_free (struct _ESExp *f, struct _ESExpResult *t);
/* used in normal functions if they have to abort, to free their arguments */
void e_sexp_resultv_free (struct _ESExp *f, int argc, struct _ESExpResult **argv);
/* utility functions for creating s-exp strings. */
void e_sexp_encode_bool (GString *s, gboolean state);
void e_sexp_encode_string (GString *s, const char *string);
/* only to be called from inside a callback to signal a fatal execution error */
void e_sexp_fatal_error (struct _ESExp *f, char *why, ...);
/* return the error string */
const char *e_sexp_error (struct _ESExp *f);
#endif /* _E_SEXP_H */
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