freebsd-dev/contrib/groff/eqn/box.cc
1996-09-07 16:18:32 +00:00

612 lines
13 KiB
C++

// -*- 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"
const char *current_roman_font;
char *gfont = 0;
char *grfont = 0;
char *gbfont = 0;
int gsize = 0;
int script_size_reduction = -1; // negative means reduce by a percentage
int positive_space = -1;
int negative_space = -1;
int minimum_size = 5;
int fat_offset = 4;
int body_height = 85;
int body_depth = 35;
int over_hang = 0;
int accent_width = 31;
int delimiter_factor = 900;
int delimiter_shortfall = 50;
int null_delimiter_space = 12;
int script_space = 5;
int thin_space = 17;
int medium_space = 22;
int thick_space = 28;
int num1 = 70;
int num2 = 40;
// we don't use num3, because we don't have \atop
int denom1 = 70;
int denom2 = 36;
int axis_height = 26; // in 100ths of an em
int sup1 = 42;
int sup2 = 37;
int sup3 = 28;
int default_rule_thickness = 4;
int sub1 = 20;
int sub2 = 23;
int sup_drop = 38;
int sub_drop = 5;
int x_height = 45;
int big_op_spacing1 = 11;
int big_op_spacing2 = 17;
int big_op_spacing3 = 20;
int big_op_spacing4 = 60;
int big_op_spacing5 = 10;
// These are for piles and matrices.
int baseline_sep = 140; // = num1 + denom1
int shift_down = 26; // = axis_height
int column_sep = 100; // = em space
int matrix_side_sep = 17; // = thin space
int nroff = 0; // should we grok ndefine or tdefine?
struct {
const char *name;
int *ptr;
} param_table[] = {
{ "fat_offset", &fat_offset },
{ "over_hang", &over_hang },
{ "accent_width", &accent_width },
{ "delimiter_factor", &delimiter_factor },
{ "delimiter_shortfall", &delimiter_shortfall },
{ "null_delimiter_space", &null_delimiter_space },
{ "script_space", &script_space },
{ "thin_space", &thin_space },
{ "medium_space", &medium_space },
{ "thick_space", &thick_space },
{ "num1", &num1 },
{ "num2", &num2 },
{ "denom1", &denom1 },
{ "denom2", &denom2 },
{ "axis_height", &axis_height },
{ "sup1", &sup1 },
{ "sup2", &sup2 },
{ "sup3", &sup3 },
{ "default_rule_thickness", &default_rule_thickness },
{ "sub1", &sub1 },
{ "sub2", &sub2 },
{ "sup_drop", &sup_drop },
{ "sub_drop", &sub_drop },
{ "x_height", &x_height },
{ "big_op_spacing1", &big_op_spacing1 },
{ "big_op_spacing2", &big_op_spacing2 },
{ "big_op_spacing3", &big_op_spacing3 },
{ "big_op_spacing4", &big_op_spacing4 },
{ "big_op_spacing5", &big_op_spacing5 },
{ "minimum_size", &minimum_size },
{ "baseline_sep", &baseline_sep },
{ "shift_down", &shift_down },
{ "column_sep", &column_sep },
{ "matrix_side_sep", &matrix_side_sep },
{ "draw_lines", &draw_flag },
{ "body_height", &body_height },
{ "body_depth", &body_depth },
{ "nroff", &nroff },
{ 0, 0 }
};
void set_param(const char *name, int value)
{
for (int i = 0; param_table[i].name != 0; i++)
if (strcmp(param_table[i].name, name) == 0) {
*param_table[i].ptr = value;
return;
}
error("unrecognised parameter `%1'", name);
}
int script_style(int style)
{
return style > SCRIPT_STYLE ? style - 2 : style;
}
int cramped_style(int style)
{
return (style & 1) ? style - 1 : style;
}
void set_space(int n)
{
if (n < 0)
negative_space = -n;
else
positive_space = n;
}
// Return 0 if the specified size is bad.
// The caller is responsible for giving the error message.
int set_gsize(const char *s)
{
const char *p = (*s == '+' || *s == '-') ? s + 1 : s;
char *end;
long n = strtol(p, &end, 10);
if (n <= 0 || *end != '\0' || n > INT_MAX)
return 0;
if (p > s) {
if (!gsize)
gsize = 10;
if (*s == '+') {
if (gsize > INT_MAX - n)
return 0;
gsize += int(n);
}
else {
if (gsize - n <= 0)
return 0;
gsize -= int(n);
}
}
else
gsize = int(n);
return 1;
}
void set_script_reduction(int n)
{
script_size_reduction = n;
}
const char *get_gfont()
{
return gfont ? gfont : "I";
}
const char *get_grfont()
{
return grfont ? grfont : "R";
}
const char *get_gbfont()
{
return gbfont ? gbfont : "B";
}
void set_gfont(const char *s)
{
a_delete gfont;
gfont = strsave(s);
}
void set_grfont(const char *s)
{
a_delete grfont;
grfont = strsave(s);
}
void set_gbfont(const char *s)
{
a_delete gbfont;
gbfont = strsave(s);
}
// this must be precisely 2 characters in length
#define COMPATIBLE_REG "0C"
void start_string()
{
printf(".nr " COMPATIBLE_REG " \\n(.C\n");
printf(".cp 0\n");
printf(".ds " LINE_STRING "\n");
}
void output_string()
{
printf("\\*[" LINE_STRING "]\n");
}
void restore_compatibility()
{
printf(".cp \\n(" COMPATIBLE_REG "\n");
}
void do_text(const char *s)
{
printf(".eo\n");
printf(".as " LINE_STRING " \"%s\n", s);
printf(".ec\n");
}
void set_minimum_size(int n)
{
minimum_size = n;
}
void set_script_size()
{
if (minimum_size < 0)
minimum_size = 0;
if (script_size_reduction >= 0)
printf(".ps \\n[.s]-%d>?%d\n", script_size_reduction, minimum_size);
else
printf(".ps (u;\\n[.s]*7+5/10>?%d)*1z\n", minimum_size);
}
int box::next_uid = 0;
box::box() : uid(next_uid++), spacing_type(ORDINARY_TYPE)
{
}
box::~box()
{
}
void box::top_level()
{
// debug_print();
// putc('\n', stderr);
box *b = this;
printf(".nr " SAVED_FONT_REG " \\n[.f]\n");
printf(".ft\n");
printf(".nr " SAVED_PREV_FONT_REG " \\n[.f]\n");
printf(".ft %s\n", get_gfont());
printf(".nr " SAVED_SIZE_REG " \\n[.s]z\n");
if (gsize > 0) {
char buf[INT_DIGITS + 1];
sprintf(buf, "%d", gsize);
b = new size_box(strsave(buf), b);
}
current_roman_font = get_grfont();
// This catches tabs used within \Z (which aren't allowed).
b->check_tabs(0);
int r = b->compute_metrics(DISPLAY_STYLE);
printf(".ft \\n[" SAVED_PREV_FONT_REG "]\n");
printf(".ft \\n[" SAVED_FONT_REG "]\n");
printf(".nr " MARK_OR_LINEUP_FLAG_REG " %d\n", r);
if (r == FOUND_MARK) {
printf(".nr " SAVED_MARK_REG " \\n[" MARK_REG "]\n");
printf(".nr " MARK_WIDTH_REG " 0\\n[" WIDTH_FORMAT "]\n", b->uid);
}
else if (r == FOUND_LINEUP)
printf(".if r" SAVED_MARK_REG " .as " LINE_STRING " \\h'\\n["
SAVED_MARK_REG "]u-\\n[" MARK_REG "]u'\n");
else
assert(r == FOUND_NOTHING);
// The problem here is that the argument to \f is read in copy mode,
// so we cannot use \E there; so we hide it in a string instead.
// Another problem is that if we use \R directly, then the space will
// prevent it working in a macro argument.
printf(".ds " SAVE_FONT_STRING " "
"\\R'" SAVED_INLINE_FONT_REG " \\\\n[.f]'"
"\\fP"
"\\R'" SAVED_INLINE_PREV_FONT_REG " \\\\n[.f]'"
"\\R'" SAVED_INLINE_SIZE_REG " \\\\n[.s]z'"
"\\s0"
"\\R'" SAVED_INLINE_PREV_SIZE_REG " \\\\n[.s]z'"
"\n"
".ds " RESTORE_FONT_STRING " "
"\\f[\\\\n[" SAVED_INLINE_PREV_FONT_REG "]]"
"\\f[\\\\n[" SAVED_INLINE_FONT_REG "]]"
"\\s'\\\\n[" SAVED_INLINE_PREV_SIZE_REG "]u'"
"\\s'\\\\n[" SAVED_INLINE_SIZE_REG "]u'"
"\n");
printf(".as " LINE_STRING " \\&\\E*[" SAVE_FONT_STRING "]");
printf("\\f[%s]", get_gfont());
printf("\\s'\\En[" SAVED_SIZE_REG "]u'");
current_roman_font = get_grfont();
b->output();
printf("\\E*[" RESTORE_FONT_STRING "]\n");
if (r == FOUND_LINEUP)
printf(".if r" SAVED_MARK_REG " .as " LINE_STRING " \\h'\\n["
MARK_WIDTH_REG "]u-\\n[" SAVED_MARK_REG "]u-(\\n["
WIDTH_FORMAT "]u-\\n[" MARK_REG "]u)'\n",
b->uid);
b->extra_space();
if (!inline_flag)
printf(".ne \\n[" HEIGHT_FORMAT "]u-%dM>?0+(\\n["
DEPTH_FORMAT "]u-%dM>?0)\n",
b->uid, body_height, b->uid, body_depth);
delete b;
next_uid = 0;
}
// gpic defines this register so as to make geqn not produce `\x's
#define EQN_NO_EXTRA_SPACE_REG "0x"
void box::extra_space()
{
printf(".if !r" EQN_NO_EXTRA_SPACE_REG " "
".nr " EQN_NO_EXTRA_SPACE_REG " 0\n");
if (positive_space >= 0 || negative_space >= 0) {
if (positive_space > 0)
printf(".if !\\n[" EQN_NO_EXTRA_SPACE_REG "] "
".as " LINE_STRING " \\x'-%dM'\n", positive_space);
if (negative_space > 0)
printf(".if !\\n[" EQN_NO_EXTRA_SPACE_REG "] "
".as " LINE_STRING " \\x'%dM'\n", negative_space);
positive_space = negative_space = -1;
}
else {
printf(".if !\\n[" EQN_NO_EXTRA_SPACE_REG "] "
".if \\n[" HEIGHT_FORMAT "]>%dM .as " LINE_STRING
" \\x'-(\\n[" HEIGHT_FORMAT
"]u-%dM)'\n",
uid, body_height, uid, body_height);
printf(".if !\\n[" EQN_NO_EXTRA_SPACE_REG "] "
".if \\n[" DEPTH_FORMAT "]>%dM .as " LINE_STRING
" \\x'\\n[" DEPTH_FORMAT
"]u-%dM'\n",
uid, body_depth, uid, body_depth);
}
}
int box::compute_metrics(int)
{
printf(".nr " WIDTH_FORMAT " 0\n", uid);
printf(".nr " HEIGHT_FORMAT " 0\n", uid);
printf(".nr " DEPTH_FORMAT " 0\n", uid);
return FOUND_NOTHING;
}
void box::compute_subscript_kern()
{
printf(".nr " SUB_KERN_FORMAT " 0\n", uid);
}
void box::compute_skew()
{
printf(".nr " SKEW_FORMAT " 0\n", uid);
}
void box::output()
{
}
void box::check_tabs(int)
{
}
int box::is_char()
{
return 0;
}
int box::left_is_italic()
{
return 0;
}
int box::right_is_italic()
{
return 0;
}
void box::hint(unsigned)
{
}
void box::handle_char_type(int, int)
{
}
box_list::box_list(box *pp)
{
p = new box*[10];
for (int i = 0; i < 10; i++)
p[i] = 0;
maxlen = 10;
len = 1;
p[0] = pp;
}
void box_list::append(box *pp)
{
if (len + 1 > maxlen) {
box **oldp = p;
maxlen *= 2;
p = new box*[maxlen];
memcpy(p, oldp, sizeof(box*)*len);
a_delete oldp;
}
p[len++] = pp;
}
box_list::~box_list()
{
for (int i = 0; i < len; i++)
delete p[i];
a_delete p;
}
void box_list::list_check_tabs(int level)
{
for (int i = 0; i < len; i++)
p[i]->check_tabs(level);
}
pointer_box::pointer_box(box *pp) : p(pp)
{
spacing_type = p->spacing_type;
}
pointer_box::~pointer_box()
{
delete p;
}
int pointer_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);
return r;
}
void pointer_box::compute_subscript_kern()
{
p->compute_subscript_kern();
printf(".nr " SUB_KERN_FORMAT " \\n[" SUB_KERN_FORMAT "]\n", uid, p->uid);
}
void pointer_box::compute_skew()
{
p->compute_skew();
printf(".nr " SKEW_FORMAT " 0\\n[" SKEW_FORMAT "]\n",
uid, p->uid);
}
void pointer_box::check_tabs(int level)
{
p->check_tabs(level);
}
int simple_box::compute_metrics(int)
{
printf(".nr " WIDTH_FORMAT " 0\\w" DELIMITER_CHAR, uid);
output();
printf(DELIMITER_CHAR "\n");
printf(".nr " HEIGHT_FORMAT " 0>?\\n[rst]\n", uid);
printf(".nr " DEPTH_FORMAT " 0-\\n[rsb]>?0\n", uid);
printf(".nr " SUB_KERN_FORMAT " 0-\\n[ssc]>?0\n", uid);
printf(".nr " SKEW_FORMAT " 0\\n[skw]\n", uid);
return FOUND_NOTHING;
}
void simple_box::compute_subscript_kern()
{
// do nothing, we already computed it in do_metrics
}
void simple_box::compute_skew()
{
// do nothing, we already computed it in do_metrics
}
int box::is_simple()
{
return 0;
}
int simple_box::is_simple()
{
return 1;
}
quoted_text_box::quoted_text_box(char *s) : text(s)
{
}
quoted_text_box::~quoted_text_box()
{
a_delete text;
}
void quoted_text_box::output()
{
if (text)
fputs(text, stdout);
}
tab_box::tab_box() : disabled(0)
{
}
// We treat a tab_box as having width 0 for width computations.
void tab_box::output()
{
if (!disabled)
printf("\\t");
}
void tab_box::check_tabs(int level)
{
if (level > 0) {
error("tabs allowed only at outermost level");
disabled = 1;
}
}
space_box::space_box()
{
spacing_type = SUPPRESS_TYPE;
}
void space_box::output()
{
printf("\\h'%dM'", thick_space);
}
half_space_box::half_space_box()
{
spacing_type = SUPPRESS_TYPE;
}
void half_space_box::output()
{
printf("\\h'%dM'", thin_space);
}
void box_list::list_debug_print(const char *sep)
{
p[0]->debug_print();
for (int i = 1; i < len; i++) {
fprintf(stderr, "%s", sep);
p[i]->debug_print();
}
}
void quoted_text_box::debug_print()
{
fprintf(stderr, "\"%s\"", (text ? text : ""));
}
void half_space_box::debug_print()
{
fprintf(stderr, "^");
}
void space_box::debug_print()
{
fprintf(stderr, "~");
}
void tab_box::debug_print()
{
fprintf(stderr, "<tab>");
}