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/* nesting.h
Copyright 2009 Taco Hoekwater <taco@luatex.org>
This file is part of LuaTeX.
LuaTeX 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.
LuaTeX 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 Lesser General Public
License for more details.
You should have received a copy of the GNU General Public License along
with LuaTeX; if not, see <http://www.gnu.org/licenses/>. */
#ifndef NESTING_H
# define NESTING_H
# define vmode 1 /* vertical mode */
# define hmode (vmode+max_command_cmd+1)
/* horizontal mode */
# define mmode (hmode+max_command_cmd+1)
/* math mode */
extern void print_mode(int m);
extern void print_in_mode(int m);
extern int get_mode_id(void);
# define ignore_depth -65536000 /* magic dimension value to mean `ignore me' */
typedef struct list_state_record_ {
int mode_field;
halfword head_field;
halfword tail_field;
halfword eTeX_aux_field;
int pg_field;
int ml_field;
halfword prev_depth_field;
halfword space_factor_field;
halfword incompleat_noad_field;
halfword dirs_field;
int math_field;
int math_style_field;
} list_state_record;
extern list_state_record *nest;
extern int nest_ptr;
extern int max_nest_stack;
# define cur_list nest[nest_ptr]
/* the ``top'' semantic state */
extern int shown_mode;
extern halfword save_tail;
extern void push_nest(void);
extern void pop_nest(void);
extern void initialize_nesting(void);
extern void tail_append(halfword p);
extern halfword pop_tail(void);
extern void show_activities(void);
#endif
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