NetBSD/gnu/usr.bin/groff/troff/reg.cc

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// -*- C++ -*-
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/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
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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
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Software Foundation; either version 2, or (at your option) any later
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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
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with groff; see the file COPYING. If not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "troff.h"
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#include "symbol.h"
#include "dictionary.h"
#include "token.h"
#include "request.h"
#include "reg.h"
object_dictionary number_reg_dictionary(101);
int reg::get_value(units * /*d*/)
{
return 0;
}
void reg::increment()
{
error("can't increment read-only register");
}
void reg::decrement()
{
error("can't decrement read-only register");
}
void reg::set_increment(units /*n*/)
{
error("can't auto increment read-only register");
}
void reg::alter_format(char /*f*/, int /*w*/)
{
error("can't alter format of read-only register");
}
const char *reg::get_format()
{
return "0";
}
void reg::set_value(units /*n*/)
{
error("can't write read-only register");
}
general_reg::general_reg() : format('1'), width(0), inc(0)
{
}
static const char *number_value_to_ascii(int value, char format, int width)
{
static char buf[128]; // must be at least 21
switch(format) {
case '1':
if (width <= 0)
return itoa(value);
else if (width > sizeof(buf) - 2)
sprintf(buf, "%.*d", sizeof(buf) - 2, int(value));
else
sprintf(buf, "%.*d", width, int(value));
break;
case 'i':
case 'I':
{
char *p = buf;
// troff uses z and w to represent 10000 and 5000 in Roman
// numerals; I can find no historical basis for this usage
const char *s = format == 'i' ? "zwmdclxvi" : "ZWMDCLXVI";
int n = int(value);
if (n >= 40000 || n <= -40000) {
error("magnitude of `%1' too big for i or I format", n);
return itoa(n);
}
if (n == 0) {
*p++ = '0';
*p = 0;
break;
}
if (n < 0) {
*p++ = '-';
n = -n;
}
while (n >= 10000) {
*p++ = s[0];
n -= 10000;
}
for (int i = 1000; i > 0; i /= 10, s += 2) {
int m = n/i;
n -= m*i;
switch (m) {
case 3:
*p++ = s[2];
/* falls through */
case 2:
*p++ = s[2];
/* falls through */
case 1:
*p++ = s[2];
break;
case 4:
*p++ = s[2];
*p++ = s[1];
break;
case 8:
*p++ = s[1];
*p++ = s[2];
*p++ = s[2];
*p++ = s[2];
break;
case 7:
*p++ = s[1];
*p++ = s[2];
*p++ = s[2];
break;
case 6:
*p++ = s[1];
*p++ = s[2];
break;
case 5:
*p++ = s[1];
break;
case 9:
*p++ = s[2];
*p++ = s[0];
}
}
*p = 0;
break;
}
case 'a':
case 'A':
{
int n = value;
char *p = buf;
if (n == 0) {
*p++ = '0';
*p = 0;
}
else {
if (n < 0) {
n = -n;
*p++ = '-';
}
// this is a bit tricky
while (n > 0) {
int d = n % 26;
if (d == 0)
d = 26;
n -= d;
n /= 26;
*p++ = format + d - 1;
}
*p-- = 0;
char *q = buf[0] == '-' ? buf+1 : buf;
while (q < p) {
char temp = *q;
*q = *p;
*p = temp;
--p;
++q;
}
}
break;
}
default:
assert(0);
break;
}
return buf;
}
const char *general_reg::get_string()
{
units n;
if (!get_value(&n))
return "";
return number_value_to_ascii(n, format, width);
}
void general_reg::increment()
{
int n;
if (get_value(&n))
set_value(n + inc);
}
void general_reg::decrement()
{
int n;
if (get_value(&n))
set_value(n - inc);
}
void general_reg::set_increment(units n)
{
inc = n;
}
void general_reg::alter_format(char f, int w)
{
format = f;
width = w;
}
static const char *number_format_to_ascii(char format, int width)
{
static char buf[24];
if (format == '1') {
if (width > 0) {
int n = width;
if (n > int(sizeof(buf)) - 1)
n = int(sizeof(buf)) - 1;
sprintf(buf, "%.*d", n, 0);
return buf;
}
else
return "0";
}
else {
buf[0] = format;
buf[1] = '\0';
return buf;
}
}
const char *general_reg::get_format()
{
return number_format_to_ascii(format, width);
}
class number_reg : public general_reg {
units value;
public:
number_reg();
int get_value(units *);
void set_value(units);
};
number_reg::number_reg() : value(0)
{
}
int number_reg::get_value(units *res)
{
*res = value;
return 1;
}
void number_reg::set_value(units n)
{
value = n;
}
variable_reg::variable_reg(units *p) : ptr(p)
{
}
void variable_reg::set_value(units n)
{
*ptr = n;
}
int variable_reg::get_value(units *res)
{
*res = *ptr;
return 1;
}
void define_number_reg()
{
symbol nm = get_name(1);
if (nm.is_null()) {
skip_line();
return;
}
reg *r = (reg *)number_reg_dictionary.lookup(nm);
units v;
units prev_value;
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if (!r || !r->get_value(&prev_value))
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prev_value = 0;
if (get_number(&v, 'u', prev_value)) {
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if (r == 0) {
r = new number_reg;
number_reg_dictionary.define(nm, r);
}
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r->set_value(v);
if (tok.space() && has_arg() && get_number(&v, 'u'))
r->set_increment(v);
}
skip_line();
}
#if 0
void inline_define_reg()
{
token start;
start.next();
if (!start.delimiter(1))
return;
tok.next();
symbol nm = get_name(1);
if (nm.is_null())
return;
reg *r = (reg *)number_reg_dictionary.lookup(nm);
if (r == 0) {
r = new number_reg;
number_reg_dictionary.define(nm, r);
}
units v;
units prev_value;
if (!r->get_value(&prev_value))
prev_value = 0;
if (get_number(&v, 'u', prev_value)) {
r->set_value(v);
if (start != tok) {
if (get_number(&v, 'u')) {
r->set_increment(v);
if (start != tok)
warning(WARN_DELIM, "closing delimiter does not match");
}
}
}
}
#endif
void set_number_reg(symbol nm, units n)
{
reg *r = (reg *)number_reg_dictionary.lookup(nm);
if (r == 0) {
r = new number_reg;
number_reg_dictionary.define(nm, r);
}
r->set_value(n);
}
reg *lookup_number_reg(symbol nm)
{
reg *r = (reg *)number_reg_dictionary.lookup(nm);
if (r == 0) {
warning(WARN_REG, "number register `%1' not defined", nm.contents());
r = new number_reg;
number_reg_dictionary.define(nm, r);
}
return r;
}
void alter_format()
{
symbol nm = get_name(1);
if (nm.is_null()) {
skip_line();
return;
}
reg *r = (reg *)number_reg_dictionary.lookup(nm);
if (r == 0) {
r = new number_reg;
number_reg_dictionary.define(nm, r);
}
tok.skip();
char c = tok.ch();
if (csdigit(c)) {
int n = 0;
do {
++n;
tok.next();
} while (csdigit(tok.ch()));
r->alter_format('1', n);
}
else if (c == 'i' || c == 'I' || c == 'a' || c == 'A')
r->alter_format(c);
else if (tok.newline() || tok.eof())
warning(WARN_MISSING, "missing number register format");
else
error("bad number register format (got %1)", tok.description());
skip_line();
}
void remove_reg()
{
for (;;) {
symbol s = get_name();
if (s.is_null())
break;
number_reg_dictionary.remove(s);
}
skip_line();
}
void alias_reg()
{
symbol s1 = get_name(1);
if (!s1.is_null()) {
symbol s2 = get_name(1);
if (!s2.is_null()) {
if (!number_reg_dictionary.alias(s1, s2))
warning(WARN_REG, "number register `%1' not defined", s2.contents());
}
}
skip_line();
}
void rename_reg()
{
symbol s1 = get_name(1);
if (!s1.is_null()) {
symbol s2 = get_name(1);
if (!s2.is_null())
number_reg_dictionary.rename(s1, s2);
}
skip_line();
}
void print_number_regs()
{
object_dictionary_iterator iter(number_reg_dictionary);
reg *r;
symbol s;
while (iter.get(&s, (object **)&r)) {
assert(!s.is_null());
errprint("%1\t", s.contents());
const char *p = r->get_string();
if (p)
errprint(p);
errprint("\n");
}
fflush(stderr);
skip_line();
}
void init_reg_requests()
{
init_request("rr", remove_reg);
init_request("nr", define_number_reg);
init_request("af", alter_format);
init_request("aln", alias_reg);
init_request("rnn", rename_reg);
init_request("pnr", print_number_regs);
}