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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "eqn.h"
#include "pbox.h"
class script_box : public pointer_box {
private:
box *sub;
box *sup;
public:
script_box(box *, box *, box *);
~script_box();
int compute_metrics(int);
void output();
void debug_print();
int left_is_italic();
void hint(unsigned);
void check_tabs(int);
};
/* The idea is that the script should attach to the rightmost box
of a list. For example, given `2x sup 3', the superscript should
attach to `x' rather than `2x'. */
box *make_script_box(box *nuc, box *sub, box *sup)
{
list_box *b = nuc->to_list_box();
if (b != 0) {
b->list.p[b->list.len-1] = make_script_box(b->list.p[b->list.len - 1],
sub,
sup);
return b;
}
else
return new script_box(nuc, sub, sup);
}
script_box::script_box(box *pp, box *qq, box *rr)
: pointer_box(pp), sub(qq), sup(rr)
{
}
script_box::~script_box()
{
delete sub;
delete sup;
}
int script_box::left_is_italic()
{
return p->left_is_italic();
}
int script_box::compute_metrics(int style)
{
int res = p->compute_metrics(style);
p->compute_subscript_kern();
printf(".nr " SIZE_FORMAT " \\n[.s]\n", uid);
if (!(style <= SCRIPT_STYLE && one_size_reduction_flag))
set_script_size();
printf(".nr " SMALL_SIZE_FORMAT " \\n[.s]\n", uid);
if (sub != 0)
sub->compute_metrics(cramped_style(script_style(style)));
if (sup != 0)
sup->compute_metrics(script_style(style));
// 18a
if (p->is_char()) {
printf(".nr " SUP_RAISE_FORMAT " 0\n", uid);
printf(".nr " SUB_LOWER_FORMAT " 0\n", uid);
}
else {
printf(".nr " SUP_RAISE_FORMAT " \\n[" HEIGHT_FORMAT "]-%dM>?0\n",
uid, p->uid, sup_drop);
printf(".nr " SUB_LOWER_FORMAT " \\n[" DEPTH_FORMAT "]+%dM\n",
uid, p->uid, sub_drop);
}
printf(".ps \\n[" SIZE_FORMAT "]\n", uid);
if (sup == 0) {
assert(sub != 0);
// 18b
printf(".nr " SUB_LOWER_FORMAT " \\n[" SUB_LOWER_FORMAT "]>?%dM>?(\\n["
HEIGHT_FORMAT "]-(%dM*4/5))\n",
uid, uid, sub1, sub->uid, x_height);
}
else {
// sup != 0
// 18c
int p;
if (style == DISPLAY_STYLE)
p = sup1;
else if (style & 1) // not cramped
p = sup2;
else
p = sup3;
printf(".nr " SUP_RAISE_FORMAT " \\n[" SUP_RAISE_FORMAT
"]>?%dM>?(\\n[" DEPTH_FORMAT "]+(%dM/4))\n",
uid, uid, p, sup->uid, x_height);
// 18d
if (sub != 0) {
printf(".nr " SUB_LOWER_FORMAT " \\n[" SUB_LOWER_FORMAT "]>?%dM\n",
uid, uid, sub2);
// 18e
printf(".nr " TEMP_REG " \\n[" DEPTH_FORMAT "]-\\n["
SUP_RAISE_FORMAT "]+\\n[" HEIGHT_FORMAT "]-\\n["
SUB_LOWER_FORMAT "]+(4*%dM)\n",
sup->uid, uid, sub->uid, uid, default_rule_thickness);
printf(".if \\n[" TEMP_REG "] \\{");
printf(".nr " SUB_LOWER_FORMAT " +\\n[" TEMP_REG "]\n", uid);
printf(".nr " TEMP_REG " (%dM*4/5)-\\n[" SUP_RAISE_FORMAT
"]+\\n[" DEPTH_FORMAT "]>?0\n",
x_height, uid, sup->uid);
printf(".nr " SUP_RAISE_FORMAT " +\\n[" TEMP_REG "]\n", uid);
printf(".nr " SUB_LOWER_FORMAT " -\\n[" TEMP_REG "]\n", uid);
printf(".\\}\n");
}
}
printf(".nr " WIDTH_FORMAT " 0\\n[" WIDTH_FORMAT "]", uid, p->uid);
if (sub != 0 && sup != 0)
printf("+((\\n[" WIDTH_FORMAT "]-\\n[" SUB_KERN_FORMAT "]>?\\n["
WIDTH_FORMAT "])+%dM)>?0\n",
sub->uid, p->uid, sup->uid, script_space);
else if (sub != 0)
printf("+(\\n[" WIDTH_FORMAT "]-\\n[" SUB_KERN_FORMAT "]+%dM)>?0\n",
sub->uid, p->uid, script_space);
else if (sup != 0)
printf("+(\\n[" WIDTH_FORMAT "]+%dM)>?0\n", sup->uid, script_space);
else
printf("\n");
printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]",
uid, p->uid);
if (sup != 0)
printf(">?(\\n[" SUP_RAISE_FORMAT "]+\\n[" HEIGHT_FORMAT "])",
uid, sup->uid);
if (sub != 0)
printf(">?(-\\n[" SUB_LOWER_FORMAT "]+\\n[" HEIGHT_FORMAT "])",
uid, sub->uid);
printf("\n");
printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]",
uid, p->uid);
if (sub != 0)
printf(">?(\\n[" SUB_LOWER_FORMAT "]+\\n[" DEPTH_FORMAT "])",
uid, sub->uid);
if (sup != 0)
printf(">?(-\\n[" SUP_RAISE_FORMAT "]+\\n[" DEPTH_FORMAT "])",
uid, sup->uid);
printf("\n");
return res;
}
void script_box::output()
{
p->output();
if (sup != 0) {
printf("\\Z" DELIMITER_CHAR);
printf("\\v'-\\n[" SUP_RAISE_FORMAT "]u'", uid);
printf("\\s[\\n[" SMALL_SIZE_FORMAT "]]", uid);
sup->output();
printf("\\s[\\n[" SIZE_FORMAT "]]", uid);
printf(DELIMITER_CHAR);
}
if (sub != 0) {
printf("\\Z" DELIMITER_CHAR);
printf("\\v'\\n[" SUB_LOWER_FORMAT "]u'", uid);
printf("\\s[\\n[" SMALL_SIZE_FORMAT "]]", uid);
printf("\\h'-\\n[" SUB_KERN_FORMAT "]u'", p->uid);
sub->output();
printf("\\s[\\n[" SIZE_FORMAT "]]", uid);
printf(DELIMITER_CHAR);
}
printf("\\h'\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u'",
uid, p->uid);
}
void script_box::hint(unsigned flags)
{
p->hint(flags & ~HINT_NEXT_IS_ITALIC);
}
void script_box::debug_print()
{
fprintf(stderr, "{ ");
p->debug_print();
fprintf(stderr, " }");
if (sub) {
fprintf(stderr, " sub { ");
sub->debug_print();
fprintf(stderr, " }");
}
if (sup) {
fprintf(stderr, " sup { ");
sup->debug_print();
fprintf(stderr, " }");
}
}
void script_box::check_tabs(int level)
{
if (sup)
sup->check_tabs(level + 1);
if (sub)
sub->check_tabs(level + 1);
p->check_tabs(level);
}
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