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// -*- C++ -*-
/* Copyright (C) 1989-2020 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 3 of the License, 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 this program. If not, see <http://www.gnu.org/licenses/>. */
#include "eqn.h"
#include "pbox.h"
class over_box : public box {
private:
int reduce_size;
box *num;
box *den;
public:
over_box(int small, box *, box *);
~over_box();
void debug_print();
int compute_metrics(int);
void output();
void check_tabs(int);
};
box *make_over_box(box *pp, box *qq)
{
return new over_box(0, pp, qq);
}
box *make_small_over_box(box *pp, box *qq)
{
return new over_box(1, pp, qq);
}
over_box::over_box(int is_small, box *pp, box *qq)
: reduce_size(is_small), num(pp), den(qq)
{
spacing_type = INNER_TYPE;
}
over_box::~over_box()
{
delete num;
delete den;
}
int over_box::compute_metrics(int style)
{
if (reduce_size) {
style = script_style(style);
printf(".nr " SIZE_FORMAT " \\n[.ps]\n", uid);
set_script_size();
printf(".nr " SMALL_SIZE_FORMAT " \\n[.ps]\n", uid);
}
int mark_uid = 0;
int res = num->compute_metrics(style);
if (res)
mark_uid = num->uid;
int r = den->compute_metrics(cramped_style(style));
if (r && res)
error("multiple marks and lineups");
else {
mark_uid = den->uid;
res = r;
}
if (reduce_size)
printf(".ps \\n[" SIZE_FORMAT "]u\n", uid);
printf(".nr " WIDTH_FORMAT " (\\n[" WIDTH_FORMAT "]>?\\n[" WIDTH_FORMAT "]",
uid, num->uid, den->uid);
// allow for \(ru being wider than both the numerator and denominator
if (!draw_flag)
fputs(">?\\w" DELIMITER_CHAR "\\(ru" DELIMITER_CHAR, stdout);
printf(")+%dM\n", null_delimiter_space*2 + over_hang*2);
// 15b
printf(".nr " SUP_RAISE_FORMAT " %dM\n",
uid, (reduce_size ? num2 : num1));
printf(".nr " SUB_LOWER_FORMAT " %dM\n",
uid, (reduce_size ? denom2 : denom1));
// 15d
printf(".nr " SUP_RAISE_FORMAT " +(\\n[" DEPTH_FORMAT
"]-\\n[" SUP_RAISE_FORMAT "]+%dM+(%dM/2)+%dM)>?0\n",
uid, num->uid, uid, axis_height, default_rule_thickness,
default_rule_thickness*(reduce_size ? 1 : 3));
printf(".nr " SUB_LOWER_FORMAT " +(\\n[" HEIGHT_FORMAT
"]-\\n[" SUB_LOWER_FORMAT "]-%dM+(%dM/2)+%dM)>?0\n",
uid, den->uid, uid, axis_height, default_rule_thickness,
default_rule_thickness*(reduce_size ? 1 : 3));
printf(".nr " HEIGHT_FORMAT " \\n[" SUP_RAISE_FORMAT "]+\\n["
HEIGHT_FORMAT "]\n",
uid, uid, num->uid);
printf(".nr " DEPTH_FORMAT " \\n[" SUB_LOWER_FORMAT "]+\\n["
DEPTH_FORMAT "]\n",
uid, uid, den->uid);
if (res)
printf(".nr " MARK_REG " +(\\n[" WIDTH_FORMAT "]-\\n["
WIDTH_FORMAT "]/2)\n", uid, mark_uid);
return res;
}
#define USE_Z
void over_box::output()
{
if (output_format == troff) {
if (reduce_size)
printf("\\s[\\n[" SMALL_SIZE_FORMAT "]u]", uid);
#ifdef USE_Z
printf("\\Z" DELIMITER_CHAR);
#endif
// move up to the numerator baseline
printf("\\v'-\\n[" SUP_RAISE_FORMAT "]u'", uid);
// move across so that it's centered
printf("\\h'\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u'",
uid, num->uid);
// print the numerator
num->output();
#ifdef USE_Z
printf(DELIMITER_CHAR);
#else
// back again
printf("\\h'-\\n[" WIDTH_FORMAT "]u'", num->uid);
printf("\\h'-(\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u)'",
uid, num->uid);
// down again
printf("\\v'\\n[" SUP_RAISE_FORMAT "]u'", uid);
#endif
#ifdef USE_Z
printf("\\Z" DELIMITER_CHAR);
#endif
// move down to the denominator baseline
printf("\\v'\\n[" SUB_LOWER_FORMAT "]u'", uid);
// move across so that it's centered
printf("\\h'\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u'",
uid, den->uid);
// print the denominator
den->output();
#ifdef USE_Z
printf(DELIMITER_CHAR);
#else
// back again
printf("\\h'-\\n[" WIDTH_FORMAT "]u'", den->uid);
printf("\\h'-(\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u)'",
uid, den->uid);
// up again
printf("\\v'-\\n[" SUB_LOWER_FORMAT "]u'", uid);
#endif
if (reduce_size)
printf("\\s[\\n[" SIZE_FORMAT "]u]", uid);
// draw the line
printf("\\h'%dM'", null_delimiter_space);
printf("\\v'-%dM'", axis_height);
fputs(draw_flag ? "\\D'l" : "\\l'", stdout);
printf("\\n[" WIDTH_FORMAT "]u-%dM",
uid, 2*null_delimiter_space);
fputs(draw_flag ? " 0'" : "\\&\\(ru'", stdout);
printf("\\v'%dM'", axis_height);
printf("\\h'%dM'", null_delimiter_space);
}
else if (output_format == mathml) {
// FIXME: passing a displaystyle attribute doesn't validate.
printf("<mfrac>");
num->output();
den->output();
printf("</mfrac>");
}
}
void over_box::debug_print()
{
fprintf(stderr, "{ ");
num->debug_print();
if (reduce_size)
fprintf(stderr, " } smallover { ");
else
fprintf(stderr, " } over { ");
den->debug_print();
fprintf(stderr, " }");
}
void over_box::check_tabs(int level)
{
num->check_tabs(level + 1);
den->check_tabs(level + 1);
}
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