home *** CD-ROM | disk | FTP | other *** search
- // -*- C++ -*-
- /* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
- Written by James Clark (jjc@jclark.com)
-
- This file is part of groff.
-
- groff 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, or (at your option) any later
- version.
-
- groff 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 General Public License
- for more details.
-
- You should have received a copy of the GNU General Public License along
- with groff; see the file COPYING. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "eqn.h"
- #include "pbox.h"
-
- enum left_or_right_t { LEFT_DELIM = 01, RIGHT_DELIM = 02 };
-
- // Small must be none-zero and must exist in each device.
- // Small will be put in the roman font, others are assumed to be
- // on the special font (so no font change will be necessary.)
-
- struct delimiter {
- const char *name;
- int flags;
- const char *small;
- const char *chain_format;
- const char *ext;
- const char *top;
- const char *mid;
- const char *bot;
- } delim_table[] = {
- {
- "(", LEFT_DELIM|RIGHT_DELIM, "(", "\\[parenleft%s]",
- "\\[parenleftex]",
- "\\[parenlefttp]",
- 0,
- "\\[parenleftbt]",
- },
- {
- ")", LEFT_DELIM|RIGHT_DELIM, ")", "\\[parenright%s]",
- "\\[parenrightex]",
- "\\[parenrighttp]",
- 0,
- "\\[parenrightbt]",
- },
- {
- "[", LEFT_DELIM|RIGHT_DELIM, "[", "\\[bracketleft%s]",
- "\\[bracketleftex]",
- "\\[bracketlefttp]",
- 0,
- "\\[bracketleftbt]",
- },
- {
- "]", LEFT_DELIM|RIGHT_DELIM, "]", "\\[bracketright%s]",
- "\\[bracketrightex]",
- "\\[bracketrighttp]",
- 0,
- "\\[bracketrightbt]",
- },
- {
- "{", LEFT_DELIM|RIGHT_DELIM, "{", "\\[braceleft%s]",
- "\\[braceleftex]",
- "\\[bracelefttp]",
- "\\[braceleftmid]",
- "\\[braceleftbt]",
- },
- {
- "}", LEFT_DELIM|RIGHT_DELIM, "}", "\\[braceright%s]",
- "\\[bracerightex]",
- "\\[bracerighttp]",
- "\\[bracerightmid]",
- "\\[bracerightbt]",
- },
- {
- "|", LEFT_DELIM|RIGHT_DELIM, "|", "\\[bar%s]",
- "\\[barex]",
- },
- {
- "floor", LEFT_DELIM, "\\(lf", "\\[floorleft%s]",
- "\\[bracketleftex]",
- 0,
- 0,
- "\\[bracketleftbt]",
- },
- {
- "floor", RIGHT_DELIM, "\\(rf", "\\[floorright%s]",
- "\\[bracketrightex]",
- 0,
- 0,
- "\\[bracketrightbt]",
- },
- {
- "ceiling", LEFT_DELIM, "\\(lc", "\\[ceilingleft%s]",
- "\\[bracketleftex]",
- "\\[bracketlefttp]",
- },
- {
- "ceiling", RIGHT_DELIM, "\\(rc", "\\[ceilingright%s]",
- "\\[bracketrightex]",
- "\\[bracketrighttp]",
- },
- {
- "||", LEFT_DELIM|RIGHT_DELIM, "|", "\\[bar%s]",
- "\\[bardblex]",
- },
- {
- "<", LEFT_DELIM|RIGHT_DELIM, "\\(la", "\\[angleleft%s]",
- },
- {
- ">", LEFT_DELIM|RIGHT_DELIM, "\\(ra", "\\[angleright%s]",
- },
- {
- "uparrow", LEFT_DELIM|RIGHT_DELIM, "\\(ua", "\\[arrowup%s]",
- "\\[arrowvertex]",
- "\\[arrowverttp]",
- },
- {
- "downarrow", LEFT_DELIM|RIGHT_DELIM, "\\(da", "\\[arrowdown%s]",
- "\\[arrowvertex]",
- 0,
- 0,
- "\\[arrowvertbt]",
- },
- {
- "updownarrow", LEFT_DELIM|RIGHT_DELIM, "\\(va", "\\[arrowupdown%s]",
- "\\[arrowvertex]",
- "\\[arrowverttp]",
- 0,
- "\\[arrowvertbt]",
- },
- };
-
- const int DELIM_TABLE_SIZE = int(sizeof(delim_table)/sizeof(delim_table[0]));
-
- class delim_box : public box {
- private:
- char *left;
- char *right;
- box *p;
- public:
- delim_box(char *, box *, char *);
- ~delim_box();
- int compute_metrics(int);
- void output();
- void check_tabs(int);
- void debug_print();
- };
-
- box *make_delim_box(char *l, box *pp, char *r)
- {
- if (l != 0 && *l == '\0') {
- a_delete l;
- l = 0;
- }
- if (r != 0 && *r == '\0') {
- a_delete r;
- r = 0;
- }
- return new delim_box(l, pp, r);
- }
-
- delim_box::delim_box(char *l, box *pp, char *r)
- : left(l), right(r), p(pp)
- {
- }
-
- delim_box::~delim_box()
- {
- a_delete left;
- a_delete right;
- delete p;
- }
-
- static void build_extensible(const char *ext, const char *top, const char *mid,
- const char *bot)
- {
- assert(ext != 0);
- printf(".nr " DELIM_WIDTH_REG " 0\\w" DELIMITER_CHAR "%s" DELIMITER_CHAR "\n",
- ext);
- printf(".nr " EXT_HEIGHT_REG " 0\\n[rst]\n");
- printf(".nr " EXT_DEPTH_REG " 0-\\n[rsb]\n");
- if (top) {
- printf(".nr " DELIM_WIDTH_REG " 0\\n[" DELIM_WIDTH_REG "]"
- ">?\\w" DELIMITER_CHAR "%s" DELIMITER_CHAR "\n",
- top);
- printf(".nr " TOP_HEIGHT_REG " 0\\n[rst]\n");
- printf(".nr " TOP_DEPTH_REG " 0-\\n[rsb]\n");
- }
- if (mid) {
- printf(".nr " DELIM_WIDTH_REG " 0\\n[" DELIM_WIDTH_REG "]"
- ">?\\w" DELIMITER_CHAR "%s" DELIMITER_CHAR "\n",
- mid);
- printf(".nr " MID_HEIGHT_REG " 0\\n[rst]\n");
- printf(".nr " MID_DEPTH_REG " 0-\\n[rsb]\n");
- }
- if (bot) {
- printf(".nr " DELIM_WIDTH_REG " 0\\n[" DELIM_WIDTH_REG "]"
- ">?\\w" DELIMITER_CHAR "%s" DELIMITER_CHAR "\n",
- bot);
- printf(".nr " BOT_HEIGHT_REG " 0\\n[rst]\n");
- printf(".nr " BOT_DEPTH_REG " 0-\\n[rsb]\n");
- }
- printf(".nr " TOTAL_HEIGHT_REG " 0");
- if (top)
- printf("+\\n[" TOP_HEIGHT_REG "]+\\n[" TOP_DEPTH_REG "]");
- if (bot)
- printf("+\\n[" BOT_HEIGHT_REG "]+\\n[" BOT_DEPTH_REG "]");
- if (mid)
- printf("+\\n[" MID_HEIGHT_REG "]+\\n[" MID_DEPTH_REG "]");
- printf("\n");
- // determine how many extensible characters we need
- printf(".nr " TEMP_REG " \\n[" DELTA_REG "]-\\n[" TOTAL_HEIGHT_REG "]");
- if (mid)
- printf("/2");
- printf(">?0+\\n[" EXT_HEIGHT_REG "]+\\n[" EXT_DEPTH_REG "]-1/(\\n["
- EXT_HEIGHT_REG "]+\\n[" EXT_DEPTH_REG "])\n");
-
- printf(".nr " TOTAL_HEIGHT_REG " +(\\n[" EXT_HEIGHT_REG "]+\\n["
- EXT_DEPTH_REG "]*\\n[" TEMP_REG "]");
- if (mid)
- printf("*2");
- printf(")\n");
- printf(".ds " DELIM_STRING " \\Z" DELIMITER_CHAR
- "\\v'-%dM-(\\n[" TOTAL_HEIGHT_REG "]u/2u)'\n",
- axis_height);
- if (top)
- printf(".as " DELIM_STRING " \\v'\\n[" TOP_HEIGHT_REG "]u'"
- "\\Z" DELIMITER_CHAR "%s" DELIMITER_CHAR
- "\\v'\\n[" TOP_DEPTH_REG "]u'\n",
- top);
-
- // this macro appends $2 copies of $3 to string $1
- printf(".de " REPEAT_APPEND_STRING_MACRO "\n"
- ".if \\\\$2 \\{.as \\\\$1 \"\\\\$3\n"
- "." REPEAT_APPEND_STRING_MACRO " \\\\$1 \\\\$2-1 \"\\\\$3\"\n"
- ".\\}\n"
- "..\n");
-
- printf("." REPEAT_APPEND_STRING_MACRO " " DELIM_STRING " \\n[" TEMP_REG "] "
- "\\v'\\n[" EXT_HEIGHT_REG "]u'"
- "\\Z" DELIMITER_CHAR "%s" DELIMITER_CHAR
- "\\v'\\n[" EXT_DEPTH_REG "]u'\n",
- ext);
-
- if (mid) {
- printf(".as " DELIM_STRING " \\v'\\n[" MID_HEIGHT_REG "]u'"
- "\\Z" DELIMITER_CHAR "%s" DELIMITER_CHAR
- "\\v'\\n[" MID_DEPTH_REG "]u'\n",
- mid);
- printf("." REPEAT_APPEND_STRING_MACRO " " DELIM_STRING
- " \\n[" TEMP_REG "] "
- "\\v'\\n[" EXT_HEIGHT_REG "]u'"
- "\\Z" DELIMITER_CHAR "%s" DELIMITER_CHAR
- "\\v'\\n[" EXT_DEPTH_REG "]u'\n",
- ext);
- }
- if (bot)
- printf(".as " DELIM_STRING " \\v'\\n[" BOT_HEIGHT_REG "]u'"
- "\\Z" DELIMITER_CHAR "%s" DELIMITER_CHAR
- "\\v'\\n[" BOT_DEPTH_REG "]u'\n",
- bot);
- printf(".as " DELIM_STRING " " DELIMITER_CHAR "\n");
- }
-
- static void define_extensible_string(char *delim, int uid,
- left_or_right_t left_or_right)
- {
- printf(".ds " DELIM_STRING "\n");
- delimiter *d = delim_table;
- int delim_len = strlen(delim);
- for (int i = 0; i < DELIM_TABLE_SIZE; i++, d++)
- if (strncmp(delim, d->name, delim_len) == 0
- && (left_or_right & d->flags) != 0)
- break;
- if (i >= DELIM_TABLE_SIZE) {
- error("there is no `%1' delimiter", delim);
- printf(".nr " DELIM_WIDTH_REG " 0\n");
- return;
- }
-
- printf(".nr " DELIM_WIDTH_REG " 0\\w" DELIMITER_CHAR "\\f[%s]%s\\fP" DELIMITER_CHAR "\n"
- ".ds " DELIM_STRING " \\Z" DELIMITER_CHAR
- "\\v'\\n[rsb]u+\\n[rst]u/2u-%dM'\\f[%s]%s\\fP" DELIMITER_CHAR "\n"
- ".nr " TOTAL_HEIGHT_REG " \\n[rst]-\\n[rsb]\n"
- ".if \\n[" TOTAL_HEIGHT_REG "]<\\n[" DELTA_REG "] "
- "\\{",
- current_roman_font, d->small, axis_height,
- current_roman_font, d->small);
-
- char buf[256];
- sprintf(buf, d->chain_format, "\\\\n[" INDEX_REG "]");
- printf(".nr " INDEX_REG " 0\n"
- ".de " TEMP_MACRO "\n"
- ".ie c%s \\{\\\n"
- ".nr " DELIM_WIDTH_REG " 0\\w" DELIMITER_CHAR "%s" DELIMITER_CHAR "\n"
- ".ds " DELIM_STRING " \\Z" DELIMITER_CHAR
- "\\v'\\\\n[rsb]u+\\\\n[rst]u/2u-%dM'%s" DELIMITER_CHAR "\n"
- ".nr " TOTAL_HEIGHT_REG " \\\\n[rst]-\\\\n[rsb]\n"
- ".if \\\\n[" TOTAL_HEIGHT_REG "]<\\n[" DELTA_REG "] "
- "\\{.nr " INDEX_REG " +1\n"
- "." TEMP_MACRO "\n"
- ".\\}\\}\n"
- ".el .nr " INDEX_REG " 0-1\n"
- "..\n"
- "." TEMP_MACRO "\n",
- buf, buf, axis_height, buf);
- if (d->ext) {
- printf(".if \\n[" INDEX_REG "]<0 \\{.if c%s \\{\\\n", d->ext);
- build_extensible(d->ext, d->top, d->mid, d->bot);
- printf(".\\}\\}\n");
- }
- printf(".\\}\n");
- printf(".as " DELIM_STRING " \\h'\\n[" DELIM_WIDTH_REG "]u'\n");
- printf(".nr " WIDTH_FORMAT " +\\n[" DELIM_WIDTH_REG "]\n", uid);
- printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]"
- ">?(\\n[" TOTAL_HEIGHT_REG "]/2+%dM)\n",
- uid, uid, axis_height);
- printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]"
- ">?(\\n[" TOTAL_HEIGHT_REG "]/2-%dM)\n",
- uid, uid, axis_height);
- }
-
- int delim_box::compute_metrics(int style)
- {
- int r = p->compute_metrics(style);
- printf(".nr " WIDTH_FORMAT " 0\\n[" WIDTH_FORMAT "]\n", uid, p->uid);
- printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]\n", uid, p->uid);
- printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]\n", uid, p->uid);
- printf(".nr " DELTA_REG " \\n[" HEIGHT_FORMAT "]-%dM"
- ">?(\\n[" DEPTH_FORMAT "]+%dM)\n",
- p->uid, axis_height, p->uid, axis_height);
- printf(".nr " DELTA_REG " 0\\n[" DELTA_REG "]*%d/500"
- ">?(\\n[" DELTA_REG "]*2-%dM)\n",
- delimiter_factor, delimiter_shortfall);
- if (left) {
- define_extensible_string(left, uid, LEFT_DELIM);
- printf(".rn " DELIM_STRING " " LEFT_DELIM_STRING_FORMAT "\n",
- uid);
- if (r)
- printf(".nr " MARK_REG " +\\n[" DELIM_WIDTH_REG "]\n");
- }
- if (right) {
- define_extensible_string(right, uid, RIGHT_DELIM);
- printf(".rn " DELIM_STRING " " RIGHT_DELIM_STRING_FORMAT "\n",
- uid);
- }
- return r;
- }
-
- void delim_box::output()
- {
- if (left)
- printf("\\*[" LEFT_DELIM_STRING_FORMAT "]", uid);
- p->output();
- if (right)
- printf("\\*[" RIGHT_DELIM_STRING_FORMAT "]", uid);
- }
-
- void delim_box::check_tabs(int level)
- {
- p->check_tabs(level);
- }
-
- void delim_box::debug_print()
- {
- fprintf(stderr, "left \"%s\" { ", left ? left : "");
- p->debug_print();
- fprintf(stderr, " }");
- if (right)
- fprintf(stderr, " right \"%s\"", right);
- }
-
-