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- // -*- 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"
-
- #define STRING_FORMAT PREFIX "str%d"
-
- #define SPECIAL_STRING "0s"
- #define SPECIAL_WIDTH_REG "0w"
- #define SPECIAL_HEIGHT_REG "0h"
- #define SPECIAL_DEPTH_REG "0d"
- #define SPECIAL_SUB_KERN_REG "0skern"
- #define SPECIAL_SKEW_REG "0skew"
-
- /*
- For example:
-
- .de Cl
- .ds 0s \Z'\\*[0s]'\v'\\n(0du'\D'l \\n(0wu -\\n(0hu-\\n(0du'\v'\\n(0hu'
- ..
- .EQ
- define cancel 'special Cl'
- .EN
- */
-
-
- class special_box : public pointer_box {
- char *macro_name;
- public:
- special_box(char *, box *);
- ~special_box();
- int compute_metrics(int);
- void compute_subscript_kern();
- void compute_skew();
- void output();
- void debug_print();
- };
-
- box *make_special_box(char *s, box *p)
- {
- return new special_box(s, p);
- }
-
- special_box::special_box(char *s, box *pp) :macro_name(s), pointer_box(pp)
- {
- }
-
- special_box::~special_box()
- {
- a_delete macro_name;
- }
-
- int special_box::compute_metrics(int style)
- {
- int r = p->compute_metrics(style);
- p->compute_subscript_kern();
- p->compute_skew();
- printf(".ds " SPECIAL_STRING " \"");
- p->output();
- printf("\n");
- printf(".nr " SPECIAL_WIDTH_REG " 0\\n[" WIDTH_FORMAT "]\n", p->uid);
- printf(".nr " SPECIAL_HEIGHT_REG " \\n[" HEIGHT_FORMAT "]\n", p->uid);
- printf(".nr " SPECIAL_DEPTH_REG " \\n[" DEPTH_FORMAT "]\n", p->uid);
- printf(".nr " SPECIAL_SUB_KERN_REG " \\n[" SUB_KERN_FORMAT "]\n", p->uid);
- printf(".nr " SPECIAL_SKEW_REG " 0\\n[" SKEW_FORMAT "]\n", p->uid);
- printf(".%s\n", macro_name);
- printf(".rn " SPECIAL_STRING " " STRING_FORMAT "\n", uid);
- printf(".nr " WIDTH_FORMAT " 0\\n[" SPECIAL_WIDTH_REG "]\n", uid);
- printf(".nr " HEIGHT_FORMAT " 0>?\\n[" SPECIAL_HEIGHT_REG "]\n", uid);
- printf(".nr " DEPTH_FORMAT " 0>?\\n[" SPECIAL_DEPTH_REG "]\n", uid);
- printf(".nr " SUB_KERN_FORMAT " 0>?\\n[" SPECIAL_SUB_KERN_REG "]\n", uid);
- printf(".nr " SKEW_FORMAT " 0\\n[" SPECIAL_SKEW_REG "]\n", uid);
- // User will have to change MARK_REG if appropriate.
- return r;
- }
-
- void special_box::compute_subscript_kern()
- {
- // Already computed in compute_metrics(), so do nothing.
- }
-
- void special_box::compute_skew()
- {
- // Already computed in compute_metrics(), so do nothing.
- }
-
- void special_box::output()
- {
- printf("\\*[" STRING_FORMAT "]", uid);
- }
-
- void special_box::debug_print()
- {
- fprintf(stderr, "special %s { ", macro_name);
- p->debug_print();
- fprintf(stderr, " }");
- }
-