source/texk/web2c/luatexdir/tex/directions.w

   1 % directions.w
   2 %
   3 % Copyright 2009-2014 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 @ @c
  21
  22
  23 #include "ptexlib.h"
  24
  25 @ @c
  26 void scan_direction(void)
  27 {
  28     int save_cur_cmd = cur_cmd;
  29     int save_cur_chr = cur_chr;
  30     get_x_token();
  31     if (cur_cmd == assign_dir_cmd) {
  32         cur_val = eqtb[cur_chr].cint;
  33         goto EXIT;
  34     } else {
  35         back_input();
  36     }
  37     if (scan_keyword("TLT")) {
  38         cur_val = dir_TLT;
  39     } else if (scan_keyword("TRT")) {
  40         cur_val = dir_TRT;
  41     } else if (scan_keyword("LTL")) {
  42         cur_val = dir_LTL;
  43     } else if (scan_keyword("RTT")) {
  44         cur_val = dir_RTT;
  45     } else {
  46         tex_error("Bad direction", NULL);
  47         cur_val = 0;
  48     }
  49     get_x_token();
  50     if (cur_cmd != spacer_cmd)
  51         back_input();
  52   EXIT:
  53     cur_cmd = save_cur_cmd;
  54     cur_chr = save_cur_chr;
  55 }
  56
  57 @ the next two are used by postlinebreak.c
  58
  59 @c
  60 halfword do_push_dir_node(halfword p, halfword a)
  61 {
  62     halfword n;
  63     n = copy_node(a);
  64     vlink(n) = p;
  65     return n;
  66 }
  67
  68 halfword do_pop_dir_node(halfword p)
  69 {
  70     halfword n = vlink(p);
  71     flush_node(p);
  72     return n;
  73 }
  74
  75 @ @c
  76 halfword dir_ptr;
  77
  78 halfword text_dir_ptr;
  79
  80 @ There is no need to do anything here at the moment.
  81 @c
  82 void initialize_directions(void)
  83 {
  84 }
  85
  86 @ @c
  87 halfword new_dir(int s)
  88 {
  89     halfword p;                 /* the new node */
  90     p = new_node(whatsit_node, dir_node);
  91     dir_dir(p) = s;
  92     dir_dvi_ptr(p) = -1;
  93     dir_level(p) = cur_level;
  94     return p;
  95 }
  96
  97 @ The global static array variable  |dir_strings| is also used
  98 by the lua nodelib interface, so it cannot be static. Putting
  99 it here instead of there avoid the nodelib having to know
 100 about the actual values of |dir_TRT| etc.
 101
 102 @c
 103 const char *dir_strings[128] = {
 104   "-TLT","???", "???", "???", "-TRT","???", "???", "???",
 105   "???", "-LTL","???", "???", "???", "???", "???", "???",
 106   "???", "???", "???", "???", "???", "???", "???", "???",
 107   "-RTT","???", "???", "???", "???", "???", "???", "???",
 108   "???", "???", "???", "???", "???", "???", "???", "???",
 109   "???", "???", "???", "???", "???", "???", "???", "???",
 110   "???", "???", "???", "???", "???", "???", "???", "???",
 111   "???", "???", "???", "???", "???", "???", "???", "???",
 112   "+TLT","???", "???", "???", "+TRT","???", "???", "???",
 113   "???", "+LTL","???", "???", "???", "???", "???", "???",
 114   "???", "???", "???", "???", "???", "???", "???", "???",
 115   "+RTT","???", "???", "???", "???", "???", "???", "???",
 116   "???", "???", "???", "???", "???", "???", "???", "???",
 117   "???", "???", "???", "???", "???", "???", "???", "???",
 118   "???", "???", "???", "???", "???", "???", "???", "???",
 119   "???", "???", "???", "???", "???", "???", "???", "???" };
 120
 121 const char *string_dir(int d)
 122 {
 123     return (dir_strings[d+64]+1);
 124 }
 125
 126
 127 @ @c
 128 void print_dir(int d)
 129 {
 130     /* hh-ls: todo: just fetch the string pt from the registry ... then the above can go */
 131
 132     tprint(string_dir(d));
 133 }
 134
 135 @ @c
 136 scaled pack_width(int curdir, int pdir, halfword p, boolean isglyph)
 137 {
 138     scaled wd = 0;
 139     if (isglyph) {
 140         if (textdir_parallel(curdir, pdir) == textglyphdir_orthogonal(pdir)) {
 141             wd = glyph_width(p);
 142             if (ex_glyph(p) != 0) {
 143               //wd = round_xn_over_d(wd, 1000 + ex_glyph(p)/1000, 1000);
 144               wd = ext_xn_over_d(wd, 1000000+ex_glyph(p), 1000000);
 145
 146             }
 147         } else {
 148             wd = glyph_depth(p) + glyph_height(p);
 149         }
 150     } else {                    /* hlist, vlist, image, form, rule */
 151         if (textdir_parallel(pdir, curdir))
 152             wd = width(p);
 153         else
 154             wd = depth(p) + height(p);
 155     }
 156     return wd;
 157 }
 158
 159 @ @c
 160 scaled_whd pack_width_height_depth(int curdir, int pdir, halfword p,
 161                                    boolean isglyph)
 162 {
 163     scaled_whd whd = { 0, 0, 0 };
 164     whd.wd = pack_width(curdir, pdir, p, isglyph);
 165     if (isglyph) {
 166         if (is_rotated(curdir)) {
 167             if (textdir_parallel(curdir, pdir))
 168                 whd.ht = whd.dp = (glyph_height(p) + glyph_depth(p)) / 2;
 169             else
 170                 whd.ht = whd.dp = glyph_width(p) / 2;
 171         } else {
 172             if (is_rotated(pdir)) {
 173                 if (textdir_parallel(curdir, pdir))
 174                     whd.ht = whd.dp = (glyph_height(p) + glyph_depth(p)) / 2;
 175                 else
 176                     whd.ht = glyph_width(p);
 177             } else {
 178                 if (glyphdir_eq(curdir, pdir)) {
 179                     whd.ht = glyph_height(p);
 180                     whd.dp = glyph_depth(p);
 181                 } else if (glyphdir_opposite(curdir, pdir)) {
 182                     whd.ht = glyph_depth(p);
 183                     whd.dp = glyph_height(p);
 184                 } else
 185                     whd.ht = glyph_width(p);
 186             }
 187         }
 188     } else {
 189         if (is_rotated(curdir)) {
 190             if (textdir_parallel(curdir, pdir))
 191                 whd.ht = whd.dp = (height(p) + depth(p)) / 2;
 192             else
 193                 whd.ht = whd.dp = width(p) / 2;
 194         } else {
 195             if (pardir_eq(curdir, pdir)) {
 196                 whd.ht = height(p);
 197                 whd.dp = depth(p);
 198             } else if (pardir_opposite(curdir, pdir)) {
 199                 whd.ht = depth(p);
 200                 whd.dp = height(p);
 201             } else
 202                 whd.ht = width(p);
 203         }
 204     }
 205     return whd;
 206 }
 207
 208 @ @c
 209 void update_text_dir_ptr(int val)
 210 {
 211     if (dir_level(text_dir_ptr) == cur_level) {
 212         /* update */
 213         dir_dir(text_dir_ptr) = val;
 214     } else {
 215         /* addition */
 216         halfword text_dir_tmp = new_dir(val);
 217         vlink(text_dir_tmp) = text_dir_ptr;
 218         text_dir_ptr = text_dir_tmp;
 219     }
 220 }