/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*-
 * $Id: awk.h,v 1.14 2012/11/01 18:57:19 we7u Exp $
 *
 * XASTIR, Amateur Station Tracking and Information Reporting
 * Copyright (C) 2003-2012  The Xastir Group
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Look at the README for more information on the program.
 *
 */
#ifndef AWK_H
#define AWK_H
#ifdef HAVE_PCRE_H
#include <pcre.h>
#endif
#ifdef HAVE_PCRE_PCRE_H
#include <pcre/pcre.h>
#endif

enum awk_symtype {STRING,INT,FLOAT}; /* the only data types */

typedef struct awk_symbol_ {	/* symbol table entry */
    struct awk_symbol_ *next_sym; /* linked list */
    const char *name;           /* name of the symbol */
    int namelen;                /* length of the name */
    enum awk_symtype type;	/* data type of symbol value */
    void *val;                  /* storage for the value */
    int size;                   /* size of *val */
    int len;                    /* current length of *val */
} awk_symbol;

#define AWK_SYMTAB_HASH_SIZE 0xff
typedef struct awk_symtab_ {	/* symbol table anchor */
    awk_symbol *hash[AWK_SYMTAB_HASH_SIZE];
} awk_symtab;

#define AWK_SYM_HASH(n,l) ((*n)&AWK_SYMTAB_HASH_SIZE)
//#define AWK_SYM_HASH(n,l) ((n[0]+((l>1)?n[1]:0))&AWK_SYMTAB_HASH_SIZE)

typedef struct awk_action_ {	/* a program statement */
    struct awk_action_ *next_act;
    enum {NOOP=0, NEXT, SKIP, ASSIGN} opcode;
    awk_symbol *dest;		/* destination of assignment */
    const char *expr;           /* value setting expression */
    int exprlen;                /* length of expression */
} awk_action;

typedef struct awk_rule_ {
    struct awk_rule_ *next_rule;    /* linked list */
    enum {BEGIN,BEGIN_REC,END_REC,END,REGEXP} ruletype;
    const char *pattern;        /* pcre pattern string */
    const u_char *tables;       /* pcre NLS tables */
    pcre *re;                   /* pcre compiled pattern */
    pcre_extra *pe;             /* pcre optimized pattern */
    const char *act;            /* the program string */
    awk_action *code;		/* compiled program */
    int flags;			/* some flags */
#define AR_MALLOC 0x01		/* pattern, act were malloc'd by me */
} awk_rule;

typedef struct awk_program_ {	/* anchor for the list of rules */
    awk_symtab *symtbl;	       /* the symbol table for this program */
    awk_rule *head;		/* head of list */
    awk_rule *last;		/* last element */
    awk_rule *begin;		/* optional BEGIN rule */
    awk_rule *begin_rec;        /* optional BEGIN_RECORD rule */
    awk_rule *end_rec;		/* optional END_RECORD rule */
    awk_rule *end;		/* optional END rule */
} awk_program;

extern awk_symtab *awk_new_symtab(void);
extern void awk_free_symtab(awk_symtab *s);
extern int awk_declare_sym(awk_symtab *this,
                       const char *name, 
                       enum awk_symtype type,
                       const void *val,
                       const int size);
extern awk_symbol *awk_find_sym(awk_symtab *this,
                        const char *name,
                        const int len);
extern int awk_set_sym(awk_symbol *s,
                   const char *val, 
                   const int len);
extern int awk_get_sym(awk_symbol *s, 
                   char *store,
                   int size,   
                   int *len);   
extern int awk_compile_stmt(awk_symtab *this,
                    awk_action *p,
                    const char *stmt,
                    int len);
extern awk_action *awk_compile_action(awk_symtab *this, const char *act);
extern void awk_free_action(awk_action *a);
extern void awk_eval_expr(awk_symtab *this,
		      awk_symbol *dest, 
		      const char *expr,
		      int exprlen);
extern int awk_exec_action(awk_symtab *this, const awk_action *code);
extern awk_rule *awk_new_rule(void);
extern void awk_free_rule(awk_rule *r);
extern awk_program *awk_new_program(void);
extern void awk_free_program(awk_program *rs);
void awk_add_rule(awk_program *this, awk_rule *r);
extern awk_program *awk_load_program_array(awk_rule rules[],int nrules);
extern awk_program *awk_load_program_file(const char *file);
extern int awk_compile_program(awk_symtab *symtbl,awk_program *rs);
extern void awk_uncompile_program(awk_program *rs);
extern int awk_exec_program(awk_program *this, char *buf, int len);
extern int awk_exec_begin_record(awk_program *this);
extern int awk_exec_end_record(awk_program *this);
extern int awk_exec_begin(awk_program *this);
extern int awk_exec_end(awk_program *this);

#endif /*!AWK_H*/
