353 lines
8.2 KiB
C++
353 lines
8.2 KiB
C++
// -*- C++ -*-
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/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
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Written by James Clark (jjc@jclark.com)
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This file is part of groff.
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groff is free software; you can redistribute it and/or modify it under
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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.
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groff is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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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 "eqn.h"
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#include "stringclass.h"
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#include "device.h"
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#include "searchpath.h"
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#include "macropath.h"
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#define STARTUP_FILE "eqnrc"
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extern int yyparse();
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static char *delim_search(char *, int);
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static int inline_equation(FILE *, string &, string &);
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char start_delim = '\0';
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char end_delim = '\0';
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int non_empty_flag;
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int inline_flag;
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int draw_flag = 0;
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int one_size_reduction_flag = 0;
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int compatible_flag = 0;
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int no_newline_in_delim_flag = 0;
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int read_line(FILE *fp, string *p)
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{
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p->clear();
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int c = -1;
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while ((c = getc(fp)) != EOF) {
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if (!illegal_input_char(c))
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*p += char(c);
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else
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error("illegal input character code `%1'", c);
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if (c == '\n')
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break;
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}
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current_lineno++;
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return p->length() > 0;
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}
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void do_file(FILE *fp, const char *filename)
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{
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string linebuf;
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string str;
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printf(".lf 1 %s\n", filename);
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current_filename = filename;
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current_lineno = 0;
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while (read_line(fp, &linebuf)) {
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if (linebuf.length() >= 4
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&& linebuf[0] == '.' && linebuf[1] == 'l' && linebuf[2] == 'f'
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&& (linebuf[3] == ' ' || linebuf[3] == '\n' || compatible_flag)) {
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put_string(linebuf, stdout);
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linebuf += '\0';
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if (interpret_lf_args(linebuf.contents() + 3))
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current_lineno--;
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}
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else if (linebuf.length() >= 4
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&& linebuf[0] == '.'
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&& linebuf[1] == 'E'
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&& linebuf[2] == 'Q'
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&& (linebuf[3] == ' ' || linebuf[3] == '\n' || compatible_flag)) {
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put_string(linebuf, stdout);
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int start_lineno = current_lineno + 1;
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str.clear();
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for (;;) {
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if (!read_line(fp, &linebuf))
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fatal("end of file before .EN");
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if (linebuf.length() >= 3 && linebuf[0] == '.' && linebuf[1] == 'E') {
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if (linebuf[2] == 'N'
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&& (linebuf.length() == 3 || linebuf[3] == ' '
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|| linebuf[3] == '\n' || compatible_flag))
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break;
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else if (linebuf[2] == 'Q' && linebuf.length() > 3
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&& (linebuf[3] == ' ' || linebuf[3] == '\n'
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|| compatible_flag))
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fatal("nested .EQ");
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}
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str += linebuf;
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}
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str += '\0';
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start_string();
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init_lex(str.contents(), current_filename, start_lineno);
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non_empty_flag = 0;
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inline_flag = 0;
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yyparse();
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if (non_empty_flag) {
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printf(".lf %d\n", current_lineno - 1);
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output_string();
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}
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restore_compatibility();
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printf(".lf %d\n", current_lineno);
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put_string(linebuf, stdout);
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}
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else if (start_delim != '\0' && linebuf.search(start_delim) >= 0
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&& inline_equation(fp, linebuf, str))
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;
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else
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put_string(linebuf, stdout);
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}
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current_filename = 0;
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current_lineno = 0;
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}
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/* Handle an inline equation. Return 1 if it was an inline equation,
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0 otherwise. */
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static int inline_equation(FILE *fp, string &linebuf, string &str)
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{
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linebuf += '\0';
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char *ptr = &linebuf[0];
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char *start = delim_search(ptr, start_delim);
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if (!start) {
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// It wasn't a delimiter after all.
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linebuf.set_length(linebuf.length() - 1); // strip the '\0'
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return 0;
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}
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start_string();
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inline_flag = 1;
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for (;;) {
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if (no_newline_in_delim_flag && strchr(start + 1, end_delim) == 0) {
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error("missing `%1'", end_delim);
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char *nl = strchr(start + 1, '\n');
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if (nl != 0)
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*nl = '\0';
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do_text(ptr);
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break;
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}
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int start_lineno = current_lineno;
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*start = '\0';
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do_text(ptr);
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ptr = start + 1;
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str.clear();
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for (;;) {
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char *end = strchr(ptr, end_delim);
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if (end != 0) {
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*end = '\0';
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str += ptr;
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ptr = end + 1;
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break;
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}
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str += ptr;
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if (!read_line(fp, &linebuf))
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fatal("end of file before `%1'", end_delim);
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linebuf += '\0';
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ptr = &linebuf[0];
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}
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str += '\0';
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init_lex(str.contents(), current_filename, start_lineno);
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yyparse();
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start = delim_search(ptr, start_delim);
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if (start == 0) {
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char *nl = strchr(ptr, '\n');
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if (nl != 0)
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*nl = '\0';
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do_text(ptr);
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break;
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}
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}
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printf(".lf %d\n", current_lineno);
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output_string();
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restore_compatibility();
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printf(".lf %d\n", current_lineno + 1);
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return 1;
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}
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/* Search for delim. Skip over number register and string names etc. */
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static char *delim_search(char *ptr, int delim)
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{
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while (*ptr) {
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if (*ptr == delim)
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return ptr;
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if (*ptr++ == '\\') {
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switch (*ptr) {
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case 'n':
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case '*':
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case 'f':
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case 'g':
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case 'k':
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switch (*++ptr) {
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case '\0':
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case '\\':
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break;
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case '(':
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if (*++ptr != '\\' && *ptr != '\0' && *++ptr != '\\' && *ptr != '\0')
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ptr++;
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break;
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case '[':
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while (*++ptr != '\0')
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if (*ptr == ']') {
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ptr++;
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break;
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}
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break;
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default:
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ptr++;
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break;
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}
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break;
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case '\\':
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case '\0':
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break;
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default:
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ptr++;
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break;
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}
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}
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}
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return 0;
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}
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void usage()
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{
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fprintf(stderr,
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"usage: %s [ -rvDCNR ] -dxx -fn -sn -pn -mn -Mdir -Ts [ files ... ]\n",
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program_name);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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program_name = argv[0];
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static char stderr_buf[BUFSIZ];
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setbuf(stderr, stderr_buf);
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int opt;
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int load_startup_file = 1;
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while ((opt = getopt(argc, argv, "DCRvd:f:p:s:m:T:M:rN")) != EOF)
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switch (opt) {
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case 'C':
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compatible_flag = 1;
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break;
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case 'R': // don't load eqnchar
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load_startup_file = 0;
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break;
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case 'M':
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macro_path.command_line_dir(optarg);
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break;
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case 'v':
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{
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extern const char *version_string;
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fprintf(stderr, "GNU eqn version %s\n", version_string);
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fflush(stderr);
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break;
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}
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case 'd':
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if (optarg[0] == '\0' || optarg[1] == '\0')
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error("-d requires two character argument");
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else if (illegal_input_char(optarg[0]))
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error("bad delimiter `%1'", optarg[0]);
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else if (illegal_input_char(optarg[1]))
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error("bad delimiter `%1'", optarg[1]);
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else {
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start_delim = optarg[0];
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end_delim = optarg[1];
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}
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break;
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case 'f':
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set_gfont(optarg);
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break;
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case 'T':
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device = optarg;
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break;
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case 's':
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if (!set_gsize(optarg))
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error("invalid size `%1'", optarg);
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break;
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case 'p':
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{
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int n;
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if (sscanf(optarg, "%d", &n) == 1)
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set_script_reduction(n);
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else
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error("bad size `%1'", optarg);
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}
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break;
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case 'm':
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{
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int n;
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if (sscanf(optarg, "%d", &n) == 1)
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set_minimum_size(n);
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else
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error("bad size `%1'", optarg);
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}
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break;
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case 'r':
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one_size_reduction_flag = 1;
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break;
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case 'D':
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warning("-D option is obsolete: use `set draw_lines 1' instead");
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draw_flag = 1;
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break;
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case 'N':
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no_newline_in_delim_flag = 1;
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break;
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case '?':
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usage();
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break;
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default:
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assert(0);
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}
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init_table(device);
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init_char_table();
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printf(".if !'\\*(.T'%s' "
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".tm warning: %s should have been given a `-T\\*(.T' option\n",
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device, program_name);
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if (load_startup_file) {
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char *path;
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FILE *fp = macro_path.open_file(STARTUP_FILE, &path);
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if (fp) {
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do_file(fp, path);
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fclose(fp);
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a_delete path;
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}
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}
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if (optind >= argc)
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do_file(stdin, "-");
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else
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for (int i = optind; i < argc; i++)
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if (strcmp(argv[i], "-") == 0)
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do_file(stdin, "-");
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else {
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errno = 0;
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FILE *fp = fopen(argv[i], "r");
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if (!fp)
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fatal("can't open `%1': %2", argv[i], strerror(errno));
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else {
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do_file(fp, argv[i]);
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fclose(fp);
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}
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}
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if (ferror(stdout) || fflush(stdout) < 0)
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fatal("output error");
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return 0;
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}
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