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/* extensions.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 EXTENSIONS_H
# define EXTENSIONS_H
extern alpha_file write_file[last_file_selector+1];
extern halfword write_file_mode[last_file_selector+1];
extern halfword write_file_translation[last_file_selector+1];
extern boolean write_open[last_file_selector+1];
# define valid_write_file(n) ((n>=0) && (n<=last_file_selector))
# define file_can_be_written(n) (valid_write_file(n) && write_open[n])
extern void expand_macros_in_tokenlist(halfword p);
extern void write_out(halfword p);
extern void finalize_write_files(void);
extern void initialize_write_files(void);
extern void close_write_file(int id);
extern boolean open_write_file(int id, char *fn);
extern scaled neg_wd;
extern scaled pos_wd;
extern scaled neg_ht;
extern halfword write_loc;
extern void do_extension(int immediate);
/*
User defined whatsits can be inserted into node lists to pass data
along from one lua call to another without interference from the
typesetting engine itself. Each has an id, a type, and a value. The
type of the value depends on the |user_node_type| field.
*/
extern void new_whatsit(int s);
extern halfword concat_tokens(halfword q, halfword r);
/*
The \.{\\pagediscards} and \.{\\splitdiscards} commands share the
command code |un_vbox| with \.{\\unvbox} and \.{\\unvcopy}, they are
distinguished by their |chr_code| values |last_box_code| and
|vsplit_code|. These |chr_code| values are larger than |box_code| and
|copy_code|.
*/
extern boolean *eof_seen; /* has eof been seen? */
extern void print_group(boolean e);
extern void group_trace(boolean e);
extern save_pointer *grp_stack; /* initial |cur_boundary| */
extern halfword *if_stack; /* initial |cond_ptr| */
extern void group_warning(void);
extern void if_warning(void);
extern void file_warning(void);
extern halfword last_line_fill; /* the |par_fill_skip| glue node of the new paragraph */
# define get_tex_dimen_register(j) dimen(j)
# define get_tex_skip_register(j) skip(j)
# define get_tex_mu_skip_register(j) mu_skip(j)
# define get_tex_count_register(j) count(j)
# define get_tex_attribute_register(j) attribute(j)
# define get_tex_box_register(j) box(j)
extern int get_tex_extension_count_register(int i);
extern void set_tex_extension_count_register(int i, int d);
extern int get_tex_extension_dimen_register(int i);
extern void set_tex_extension_dimen_register(int i, int d);
extern int get_tex_extension_toks_register (int i);
extern int set_tex_dimen_register(int j, scaled v);
extern int set_tex_skip_register(int j, halfword v);
extern int set_tex_mu_skip_register(int j, halfword v);
extern int set_tex_count_register(int j, scaled v);
extern int set_tex_box_register(int j, scaled v);
extern int set_tex_attribute_register(int j, scaled v);
extern int get_tex_toks_register(int l);
extern int set_tex_toks_register(int j, lstring s);
extern int scan_tex_toks_register(int j, int c, lstring s);
extern scaled get_tex_box_width(int j);
extern int set_tex_box_width(int j, scaled v);
extern scaled get_tex_box_height(int j);
extern int set_tex_box_height(int j, scaled v);
extern scaled get_tex_box_depth(int j);
extern int set_tex_box_depth(int j, scaled v);
/* Synctex variables */
extern int synctexoption;
extern int synctexoffset;
/* Here are extra variables for Web2c. */
extern pool_pointer edit_name_start;
extern int edit_name_length, edit_line;
extern boolean stop_at_space;
extern int shellenabledp;
extern int restrictedshell;
extern char *output_comment;
extern boolean debug_format_file;
extern int last_saved_box_index ;
extern int last_saved_image_index ;
extern int last_saved_image_pages ;
extern scaledpos last_position ;
typedef enum {
/* traditional extensions */
open_code = 0,
write_code,
close_code,
reserved_extension_code, // 3: we moved special below immediate //
reserved_immediate_code, // 4: same number as main codes, expected value //
/* backend specific implementations */
special_code,
save_box_resource_code,
use_box_resource_code,
save_image_resource_code,
use_image_resource_code,
/* backend */
dvi_extension_code,
pdf_extension_code,
} extension_codes ;
#endif
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