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/* linebreak.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 LINEBREAK_H
# define LINEBREAK_H
# define left_side 0
# define right_side 1
extern halfword just_box; /* the |hlist_node| for the last line of the new paragraph */
extern void line_break(boolean d, int line_break_context);
# define inf_bad 10000 /* infinitely bad value */
# define awful_bad 07777777777 /* more than a billion demerits */
extern void initialize_active(void);
extern void ext_do_line_break(int paragraph_dir,
int pretolerance,
int tracing_paragraphs,
int tolerance,
scaled emergency_stretch,
int looseness,
/*
int hyphen_penalty,
int ex_hyphen_penalty,
*/
int adjust_spacing,
halfword par_shape_ptr,
int adj_demerits,
int protrude_chars,
int line_penalty,
int last_line_fit,
int double_hyphen_demerits,
int final_hyphen_demerits,
int hang_indent,
int hsize,
int hang_after,
halfword left_skip,
halfword right_skip,
halfword inter_line_penalties_ptr,
int inter_line_penalty,
int club_penalty,
halfword club_penalties_ptr,
halfword widow_penalties_ptr,
int widow_penalty,
int broken_penalty, halfword final_par_glue);
extern void get_linebreak_info(int *, int *);
extern halfword find_protchar_left(halfword l, boolean d);
extern halfword find_protchar_right(halfword l, halfword r);
/* skipable nodes at the margins during character protrusion */
# define zero_dimensions(a) ( \
(width((a)) == 0) && \
(height((a)) == 0) && \
(depth((a)) == 0) \
)
# define empty_disc(a) ( \
(vlink_pre_break(a) == null) && \
(vlink_post_break(a) == null) && \
(vlink_no_break(a) == null) \
)
# define cp_skipable(a) ( (! is_char_node((a))) && ( \
((type((a)) == glue_node) && (glue_is_zero((a)))) \
|| (type((a)) == penalty_node) \
|| ((type((a)) == disc_node) && empty_disc(a)) \
|| ((type((a)) == kern_node) && ((width((a)) == 0) || (subtype((a)) == normal))) \
|| ((type((a)) == rule_node) && zero_dimensions(a)) \
|| ((type((a)) == math_node) && (surround((a)) == 0)) \
|| (type((a)) == dir_node) \
|| ((type((a)) == hlist_node) && (list_ptr((a)) == null) && zero_dimensions(a)) \
|| (type((a)) == local_par_node) \
|| (type((a)) == ins_node) \
|| (type((a)) == mark_node) \
|| (type((a)) == adjust_node) \
|| (type((a)) == boundary_node) \
|| (type((a)) == whatsit_node) \
) )
#endif
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