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/* align.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 ALIGN_H
# define ALIGN_H 1
/* We enter `\.{\\span}' into |eqtb| with |tab_mark| as its command code,
and with |span_code| as the command modifier. This makes \TeX\ interpret it
essentially the same as an alignment delimiter like `\.\&', yet it is
recognizably different when we need to distinguish it from a normal delimiter.
It also turns out to be useful to give a special |cr_code| to `\.{\\cr}',
and an even larger |cr_cr_code| to `\.{\\crcr}'.
The end of a template is represented by two ``frozen'' control sequences
called \.{\\endtemplate}. The first has the command code |end_template|, which
is |>outer_call|, so it will not easily disappear in the presence of errors.
The |get_x_token| routine converts the first into the second, which has |endv|
as its command code.
*/
# define tab_mark_cmd_code 1114113 /* {|biggest_char+2|} */
# define span_code 1114114 /* {|biggest_char+3|} */
# define cr_code (span_code+1) /* distinct from |span_code| and from any character */
# define cr_cr_code (cr_code+1) /* this distinguishes \.{\\crcr} from \.{\\cr} */
extern void init_align(void);
extern void initialize_alignments(void);
extern boolean fin_col(void);
extern void fin_row(void);
extern void align_peek(void);
extern void insert_vj_template(void);
#endif
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