contrib/groff-1.19/src/preproc/eqn/delim.cpp

   1 // -*- C++ -*-
   2 /* Copyright (C) 1989, 1990, 1991, 1992, 2003 Free Software Foundation, Inc.
   3      Written by James Clark (jjc@jclark.com)
   4
   5 This file is part of groff.
   6
   7 groff 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, or (at your option) any later
  10 version.
  11
  12 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License along
  18 with groff; see the file COPYING.  If not, write to the Free Software
  19 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
  20
  21 #include "eqn.h"
  22 #include "pbox.h"
  23
  24 enum left_or_right_t { LEFT_DELIM = 01, RIGHT_DELIM = 02 };
  25
  26 // Small must be none-zero and must exist in each device.
  27 // Small will be put in the roman font, others are assumed to be
  28 // on the special font (so no font change will be necessary.)
  29
  30 struct delimiter {
  31   const char *name;
  32   int flags;
  33   const char *small;
  34   const char *chain_format;
  35   const char *ext;
  36   const char *top;
  37   const char *mid;
  38   const char *bot;
  39 } delim_table[] = {
  40   {
  41     "(", LEFT_DELIM|RIGHT_DELIM, "(", "\\[parenleft%s]",
  42     "\\[parenleftex]",
  43     "\\[parenlefttp]",
  44     0,
  45     "\\[parenleftbt]",
  46   },
  47   {
  48     ")", LEFT_DELIM|RIGHT_DELIM, ")", "\\[parenright%s]",
  49     "\\[parenrightex]",
  50     "\\[parenrighttp]",
  51     0,
  52     "\\[parenrightbt]",
  53   },
  54   {
  55     "[", LEFT_DELIM|RIGHT_DELIM, "[", "\\[bracketleft%s]",
  56     "\\[bracketleftex]",
  57     "\\[bracketlefttp]",
  58     0,
  59     "\\[bracketleftbt]",
  60   },
  61   {
  62     "]", LEFT_DELIM|RIGHT_DELIM, "]", "\\[bracketright%s]",
  63     "\\[bracketrightex]",
  64     "\\[bracketrighttp]",
  65     0,
  66     "\\[bracketrightbt]",
  67   },
  68   {
  69     "{", LEFT_DELIM|RIGHT_DELIM, "{", "\\[braceleft%s]",
  70     "\\[braceleftex]",
  71     "\\[bracelefttp]",
  72     "\\[braceleftmid]",
  73     "\\[braceleftbt]",
  74   },
  75   {
  76     "}", LEFT_DELIM|RIGHT_DELIM, "}", "\\[braceright%s]",
  77     "\\[bracerightex]",
  78     "\\[bracerighttp]",
  79     "\\[bracerightmid]",
  80     "\\[bracerightbt]",
  81   },
  82   {
  83     "|", LEFT_DELIM|RIGHT_DELIM, "|", "\\[bar%s]",
  84     "\\[barex]",
  85     0,
  86     0,
  87     0,
  88   },
  89   {
  90     "floor", LEFT_DELIM, "\\(lf", "\\[floorleft%s]",
  91     "\\[bracketleftex]",
  92     0,
  93     0,
  94     "\\[bracketleftbt]",
  95   },
  96   {
  97     "floor", RIGHT_DELIM, "\\(rf", "\\[floorright%s]",
  98     "\\[bracketrightex]",
  99     0,
 100     0,
 101     "\\[bracketrightbt]",
 102   },
 103   {
 104     "ceiling", LEFT_DELIM, "\\(lc", "\\[ceilingleft%s]",
 105     "\\[bracketleftex]",
 106     "\\[bracketlefttp]",
 107     0,
 108     0,
 109   },
 110   {
 111     "ceiling", RIGHT_DELIM, "\\(rc", "\\[ceilingright%s]",
 112     "\\[bracketrightex]",
 113     "\\[bracketrighttp]",
 114     0,
 115     0,
 116   },
 117   {
 118     "||", LEFT_DELIM|RIGHT_DELIM, "|", "\\[bar%s]",
 119     "\\[bardblex]",
 120     0,
 121     0,
 122     0,
 123   },
 124   {
 125     "<", LEFT_DELIM|RIGHT_DELIM, "\\(la", "\\[angleleft%s]",
 126     0,
 127     0,
 128     0,
 129     0,
 130   },
 131   {
 132     ">", LEFT_DELIM|RIGHT_DELIM, "\\(ra", "\\[angleright%s]",
 133     0,
 134     0,
 135     0,
 136     0,
 137   },
 138   {
 139     "uparrow", LEFT_DELIM|RIGHT_DELIM, "\\(ua", "\\[arrowup%s]",
 140     "\\[arrowvertex]",
 141     "\\[arrowverttp]",
 142     0,
 143     0,
 144   },
 145   {
 146     "downarrow", LEFT_DELIM|RIGHT_DELIM, "\\(da", "\\[arrowdown%s]",
 147     "\\[arrowvertex]",
 148     0,
 149     0,
 150     "\\[arrowvertbt]",
 151   },
 152   {
 153     "updownarrow", LEFT_DELIM|RIGHT_DELIM, "\\(va", "\\[arrowupdown%s]",
 154     "\\[arrowvertex]",
 155     "\\[arrowverttp]",
 156     0,
 157     "\\[arrowvertbt]",
 158   },
 159 };
 160
 161 const int DELIM_TABLE_SIZE = int(sizeof(delim_table)/sizeof(delim_table[0]));
 162
 163 class delim_box : public box {
 164 private:
 165   char *left;
 166   char *right;
 167   box *p;
 168 public:
 169   delim_box(char *, box *, char *);
 170   ~delim_box();
 171   int compute_metrics(int);
 172   void output();
 173   void check_tabs(int);
 174   void debug_print();
 175 };
 176
 177 box *make_delim_box(char *l, box *pp, char *r)
 178 {
 179   if (l != 0 && *l == '\0') {
 180     a_delete l;
 181     l = 0;
 182   }
 183   if (r != 0 && *r == '\0') {
 184     a_delete r;
 185     r = 0;
 186   }
 187   return new delim_box(l, pp, r);
 188 }
 189
 190 delim_box::delim_box(char *l, box *pp, char *r)
 191 : left(l), right(r), p(pp)
 192 {
 193 }
 194
 195 delim_box::~delim_box()
 196 {
 197   a_delete left;
 198   a_delete right;
 199   delete p;
 200 }
 201
 202 static void build_extensible(const char *ext, const char *top, const char *mid,
 203                              const char *bot)
 204 {
 205   assert(ext != 0);
 206   printf(".nr " DELIM_WIDTH_REG " 0\\w" DELIMITER_CHAR "%s" DELIMITER_CHAR "\n",
 207          ext);
 208   printf(".nr " EXT_HEIGHT_REG " 0\\n[rst]\n");
 209   printf(".nr " EXT_DEPTH_REG " 0-\\n[rsb]\n");
 210   if (top) {
 211     printf(".nr " DELIM_WIDTH_REG " 0\\n[" DELIM_WIDTH_REG "]"
 212            ">?\\w" DELIMITER_CHAR "%s" DELIMITER_CHAR "\n",
 213            top);
 214     printf(".nr " TOP_HEIGHT_REG " 0\\n[rst]\n");
 215     printf(".nr " TOP_DEPTH_REG " 0-\\n[rsb]\n");
 216   }
 217   if (mid) {
 218     printf(".nr " DELIM_WIDTH_REG " 0\\n[" DELIM_WIDTH_REG "]"
 219            ">?\\w" DELIMITER_CHAR "%s" DELIMITER_CHAR "\n",
 220            mid);
 221     printf(".nr " MID_HEIGHT_REG " 0\\n[rst]\n");
 222     printf(".nr " MID_DEPTH_REG " 0-\\n[rsb]\n");
 223   }
 224   if (bot) {
 225     printf(".nr " DELIM_WIDTH_REG " 0\\n[" DELIM_WIDTH_REG "]"
 226            ">?\\w" DELIMITER_CHAR "%s" DELIMITER_CHAR "\n",
 227            bot);
 228     printf(".nr " BOT_HEIGHT_REG " 0\\n[rst]\n");
 229     printf(".nr " BOT_DEPTH_REG " 0-\\n[rsb]\n");
 230   }
 231   printf(".nr " TOTAL_HEIGHT_REG " 0");
 232   if (top)
 233     printf("+\\n[" TOP_HEIGHT_REG "]+\\n[" TOP_DEPTH_REG "]");
 234   if (bot)
 235     printf("+\\n[" BOT_HEIGHT_REG "]+\\n[" BOT_DEPTH_REG "]");
 236   if (mid)
 237     printf("+\\n[" MID_HEIGHT_REG "]+\\n[" MID_DEPTH_REG "]");
 238   printf("\n");
 239   // determine how many extensible characters we need
 240   printf(".nr " TEMP_REG " \\n[" DELTA_REG "]-\\n[" TOTAL_HEIGHT_REG "]");
 241   if (mid)
 242     printf("/2");
 243   printf(">?0+\\n[" EXT_HEIGHT_REG "]+\\n[" EXT_DEPTH_REG "]-1/(\\n["
 244          EXT_HEIGHT_REG "]+\\n[" EXT_DEPTH_REG "])\n");
 245
 246   printf(".nr " TOTAL_HEIGHT_REG " +(\\n[" EXT_HEIGHT_REG "]+\\n["
 247          EXT_DEPTH_REG "]*\\n[" TEMP_REG "]");
 248   if (mid)
 249     printf("*2");
 250   printf(")\n");
 251   printf(".ds " DELIM_STRING " \\Z" DELIMITER_CHAR
 252          "\\v'-%dM-(\\n[" TOTAL_HEIGHT_REG "]u/2u)'\n",
 253          axis_height);
 254   if (top)
 255     printf(".as " DELIM_STRING " \\v'\\n[" TOP_HEIGHT_REG "]u'"
 256            "\\Z" DELIMITER_CHAR "%s" DELIMITER_CHAR
 257            "\\v'\\n[" TOP_DEPTH_REG "]u'\n",
 258            top);
 259
 260   // this macro appends $2 copies of $3 to string $1
 261   printf(".de " REPEAT_APPEND_STRING_MACRO "\n"
 262          ".if \\\\$2 \\{.as \\\\$1 \"\\\\$3\n"
 263          "." REPEAT_APPEND_STRING_MACRO " \\\\$1 \\\\$2-1 \"\\\\$3\"\n"
 264          ".\\}\n"
 265          "..\n");
 266
 267   printf("." REPEAT_APPEND_STRING_MACRO " " DELIM_STRING " \\n[" TEMP_REG "] "
 268          "\\v'\\n[" EXT_HEIGHT_REG "]u'"
 269          "\\Z" DELIMITER_CHAR "%s" DELIMITER_CHAR
 270          "\\v'\\n[" EXT_DEPTH_REG "]u'\n",
 271          ext);
 272
 273   if (mid) {
 274     printf(".as " DELIM_STRING " \\v'\\n[" MID_HEIGHT_REG "]u'"
 275            "\\Z" DELIMITER_CHAR "%s" DELIMITER_CHAR
 276            "\\v'\\n[" MID_DEPTH_REG "]u'\n",
 277            mid);
 278     printf("." REPEAT_APPEND_STRING_MACRO " " DELIM_STRING
 279            " \\n[" TEMP_REG "] "
 280            "\\v'\\n[" EXT_HEIGHT_REG "]u'"
 281            "\\Z" DELIMITER_CHAR "%s" DELIMITER_CHAR
 282            "\\v'\\n[" EXT_DEPTH_REG "]u'\n",
 283            ext);
 284   }
 285   if (bot)
 286     printf(".as " DELIM_STRING " \\v'\\n[" BOT_HEIGHT_REG "]u'"
 287            "\\Z" DELIMITER_CHAR "%s" DELIMITER_CHAR
 288            "\\v'\\n[" BOT_DEPTH_REG "]u'\n",
 289            bot);
 290   printf(".as " DELIM_STRING " " DELIMITER_CHAR "\n");
 291 }
 292
 293 static void define_extensible_string(char *delim, int uid,
 294                                      left_or_right_t left_or_right)
 295 {
 296   printf(".ds " DELIM_STRING "\n");
 297   delimiter *d = delim_table;
 298   int delim_len = strlen(delim);
 299   int i;
 300   for (i = 0; i < DELIM_TABLE_SIZE; i++, d++)
 301     if (strncmp(delim, d->name, delim_len) == 0
 302         && (left_or_right & d->flags) != 0)
 303       break;
 304   if (i >= DELIM_TABLE_SIZE) {
 305     error("there is no `%1' delimiter", delim);
 306     printf(".nr " DELIM_WIDTH_REG " 0\n");
 307     return;
 308   }
 309
 310   printf(".nr " DELIM_WIDTH_REG " 0\\w" DELIMITER_CHAR "\\f[%s]%s\\fP" DELIMITER_CHAR "\n"
 311          ".ds " DELIM_STRING " \\Z" DELIMITER_CHAR
 312            "\\v'\\n[rsb]u+\\n[rst]u/2u-%dM'\\f[%s]%s\\fP" DELIMITER_CHAR "\n"
 313          ".nr " TOTAL_HEIGHT_REG " \\n[rst]-\\n[rsb]\n"
 314          ".if \\n[" TOTAL_HEIGHT_REG "]<\\n[" DELTA_REG "] "
 315          "\\{",
 316          current_roman_font, d->small, axis_height,
 317          current_roman_font, d->small);
 318
 319   char buf[256];
 320   sprintf(buf, d->chain_format, "\\\\n[" INDEX_REG "]");
 321   printf(".nr " INDEX_REG " 0\n"
 322          ".de " TEMP_MACRO "\n"
 323          ".ie c%s \\{\\\n"
 324          ".nr " DELIM_WIDTH_REG " 0\\w" DELIMITER_CHAR "%s" DELIMITER_CHAR "\n"
 325          ".ds " DELIM_STRING " \\Z" DELIMITER_CHAR
 326            "\\v'\\\\n[rsb]u+\\\\n[rst]u/2u-%dM'%s" DELIMITER_CHAR "\n"
 327          ".nr " TOTAL_HEIGHT_REG " \\\\n[rst]-\\\\n[rsb]\n"
 328          ".if \\\\n[" TOTAL_HEIGHT_REG "]<\\n[" DELTA_REG "] "
 329          "\\{.nr " INDEX_REG " +1\n"
 330          "." TEMP_MACRO "\n"
 331          ".\\}\\}\n"
 332          ".el .nr " INDEX_REG " 0-1\n"
 333          "..\n"
 334          "." TEMP_MACRO "\n",
 335          buf, buf, axis_height, buf);
 336   if (d->ext) {
 337     printf(".if \\n[" INDEX_REG "]<0 \\{.if c%s \\{\\\n", d->ext);
 338     build_extensible(d->ext, d->top, d->mid, d->bot);
 339     printf(".\\}\\}\n");
 340   }
 341   printf(".\\}\n");
 342   printf(".as " DELIM_STRING " \\h'\\n[" DELIM_WIDTH_REG "]u'\n");
 343   printf(".nr " WIDTH_FORMAT " +\\n[" DELIM_WIDTH_REG "]\n", uid);
 344   printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]"
 345          ">?(\\n[" TOTAL_HEIGHT_REG "]/2+%dM)\n",
 346          uid, uid, axis_height);
 347   printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]"
 348          ">?(\\n[" TOTAL_HEIGHT_REG "]/2-%dM)\n",
 349          uid, uid, axis_height);
 350 }
 351
 352 int delim_box::compute_metrics(int style)
 353 {
 354   int r = p->compute_metrics(style);
 355   printf(".nr " WIDTH_FORMAT " 0\\n[" WIDTH_FORMAT "]\n", uid, p->uid);
 356   printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]\n", uid, p->uid);
 357   printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]\n", uid, p->uid);
 358   printf(".nr " DELTA_REG " \\n[" HEIGHT_FORMAT "]-%dM"
 359          ">?(\\n[" DEPTH_FORMAT "]+%dM)\n",
 360          p->uid, axis_height, p->uid, axis_height);
 361   printf(".nr " DELTA_REG " 0\\n[" DELTA_REG "]*%d/500"
 362          ">?(\\n[" DELTA_REG "]*2-%dM)\n",
 363          delimiter_factor, delimiter_shortfall);
 364   if (left) {
 365     define_extensible_string(left, uid, LEFT_DELIM);
 366     printf(".rn " DELIM_STRING " " LEFT_DELIM_STRING_FORMAT "\n",
 367            uid);
 368     if (r)
 369       printf(".nr " MARK_REG " +\\n[" DELIM_WIDTH_REG "]\n");
 370   }
 371   if (right) {
 372     define_extensible_string(right, uid, RIGHT_DELIM);
 373     printf(".rn " DELIM_STRING " " RIGHT_DELIM_STRING_FORMAT "\n",
 374            uid);
 375   }
 376   return r;
 377 }
 378
 379 void delim_box::output()
 380 {
 381   if (left)
 382     printf("\\*[" LEFT_DELIM_STRING_FORMAT "]", uid);
 383   p->output();
 384   if (right)
 385     printf("\\*[" RIGHT_DELIM_STRING_FORMAT "]", uid);
 386 }
 387
 388 void delim_box::check_tabs(int level)
 389 {
 390   p->check_tabs(level);
 391 }
 392
 393 void delim_box::debug_print()
 394 {
 395   fprintf(stderr, "left \"%s\" { ", left ? left : "");
 396   p->debug_print();
 397   fprintf(stderr, " }");
 398   if (right)
 399     fprintf(stderr, " right \"%s\"", right);
 400 }
 401