source/texk/web2c/luatexdir/tex/linebreak.h

   1 /* linebreak.h
   2
   3    Copyright 2009 Taco Hoekwater <taco@luatex.org>
   4
   5    This file is part of LuaTeX.
   6
   7    LuaTeX is free software; you can redistribute it and/or modify it under
   8    the terms of the GNU General Public License as published by the Free
   9    Software Foundation; either version 2 of the License, or (at your
  10    option) any later version.
  11
  12    LuaTeX is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License along
  18    with LuaTeX; if not, see <http://www.gnu.org/licenses/>. */
  19
  20 #ifndef LINEBREAK_H
  21 #  define LINEBREAK_H
  22
  23 #  define left_side 0
  24 #  define right_side 1
  25
  26 extern halfword just_box;       /* the |hlist_node| for the last line of the new paragraph */
  27
  28 extern void line_break(boolean d, int line_break_context);
  29
  30 #  define inf_bad 10000         /* infinitely bad value */
  31 #  define awful_bad 07777777777 /* more than a billion demerits */
  32
  33 extern void initialize_active(void);
  34
  35 extern void ext_do_line_break(int paragraph_dir,
  36                               int pretolerance,
  37                               int tracing_paragraphs,
  38                               int tolerance,
  39                               scaled emergency_stretch,
  40                               int looseness,
  41                               /*
  42                               int hyphen_penalty,
  43                               int ex_hyphen_penalty,
  44                               */
  45                               int adjust_spacing,
  46                               halfword par_shape_ptr,
  47                               int adj_demerits,
  48                               int protrude_chars,
  49                               int line_penalty,
  50                               int last_line_fit,
  51                               int double_hyphen_demerits,
  52                               int final_hyphen_demerits,
  53                               int hang_indent,
  54                               int hsize,
  55                               int hang_after,
  56                               halfword left_skip,
  57                               halfword right_skip,
  58                               halfword inter_line_penalties_ptr,
  59                               int inter_line_penalty,
  60                               int club_penalty,
  61                               halfword club_penalties_ptr,
  62                               halfword widow_penalties_ptr,
  63                               int widow_penalty,
  64                               int broken_penalty, halfword final_par_glue);
  65
  66 extern void get_linebreak_info(int *, int *);
  67 extern halfword find_protchar_left(halfword l, boolean d);
  68 extern halfword find_protchar_right(halfword l, halfword r);
  69
  70 /* skipable nodes at the margins during character protrusion */
  71
  72 #  define zero_dimensions(a) ( \
  73     (width((a)) == 0) && \
  74     (height((a)) == 0) && \
  75     (depth((a)) == 0) \
  76 )
  77
  78 #  define empty_disc(a) ( \
  79     (vlink_pre_break(a) == null) && \
  80     (vlink_post_break(a) == null) && \
  81     (vlink_no_break(a) == null) \
  82 )
  83
  84 #  define cp_skipable(a) ( (! is_char_node((a))) && ( \
  85     ((type((a)) == glue_node) && (glue_ptr((a)) == zero_glue)) \
  86  ||  (type((a)) == penalty_node) \
  87  || ((type((a)) == disc_node) && empty_disc(a)) \
  88  || ((type((a)) == kern_node) && ((width((a)) == 0) || (subtype((a)) == normal))) \
  89  || ((type((a)) == rule_node) && zero_dimensions(a)) \
  90  || ((type((a)) == math_node) && (surround((a)) == 0)) \
  91  ||  (type((a)) == dir_node) \
  92  || ((type((a)) == hlist_node) && (list_ptr((a)) == null) && zero_dimensions(a)) \
  93  ||  (type((a)) == local_par_node) \
  94  ||  (type((a)) == ins_node) \
  95  ||  (type((a)) == mark_node) \
  96  ||  (type((a)) == adjust_node) \
  97  ||  (type((a)) == boundary_node) \
  98  ||  (type((a)) == whatsit_node) \
  99 ) )
 100
 101 #endif