/*
 * $Id: parse.h,v 1.16 2006/12/27 21:40:27 sfeam Exp $
 */

/* GNUPLOT - parse.h */

/*[
 * Copyright 1986 - 1993, 1998, 2004   Thomas Williams, Colin Kelley
 *
 * Permission to use, copy, and distribute this software and its
 * documentation for any purpose with or without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.
 *
 * Permission to modify the software is granted, but not the right to
 * distribute the complete modified source code.  Modifications are to
 * be distributed as patches to the released version.  Permission to
 * distribute binaries produced by compiling modified sources is granted,
 * provided you
 *   1. distribute the corresponding source modifications from the
 *    released version in the form of a patch file along with the binaries,
 *   2. add special version identification to distinguish your version
 *    in addition to the base release version number,
 *   3. provide your name and address as the primary contact for the
 *    support of your modified version, and
 *   4. retain our contact information in regard to use of the base
 *    software.
 * Permission to distribute the released version of the source code along
 * with corresponding source modifications in the form of a patch file is
 * granted with same provisions 2 through 4 for binary distributions.
 *
 * This software is provided "as is" without express or implied warranty
 * to the extent permitted by applicable law.
]*/

#ifndef PARSE_H
# define PARSE_H

# include "syscfg.h"
# include "gp_types.h"

#include "eval.h"

/* externally usable types defined by parse.h */

/* exported variables of parse.c */

/* The choice of dummy variables, as set by 'set dummy', 'set polar'
 * and 'set parametric' */
extern char set_dummy_var[MAX_NUM_VAR][MAX_ID_LEN+1];
/* the currently used 'dummy' variables. Usually a copy of
 * set_dummy_var, but may be changed by the '(s)plot' command
 * containing an explicit range (--> 'plot [phi=0..pi]') */
extern char c_dummy_var[MAX_NUM_VAR][MAX_ID_LEN+1];


/* Prototypes of exported functions in parse.c */

int int_expression ();
double real_expression ();
#ifdef GP_STRING_VARS
struct value * const_string_express (struct value *valptr);
#endif
struct value * const_express (struct value *valptr);
char* string_or_express (struct at_type **atptr);
struct at_type * temp_at (void);
struct at_type * perm_at (void);
struct udvt_entry * add_udv (int t_num);
struct udft_entry * add_udf (int t_num);
void cleanup_udvlist (void);

/* These are used by the iterate-over-plot code */
void check_for_iteration (void);
TBOOLEAN next_iteration  (void);
TBOOLEAN empty_iteration  (void);

#endif /* PARSE_H */
