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%{
/***************************************************************************
* deroff.l *
* *
* Removes roff constructs and preprocessors input *
* *
* (c) 1996 David Frey, <david@eos.lugs.ch> *
* *
* This program 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 of the License, or (at your *
* option) any later version. *
* *
* This program 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, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, *
* Boston, MA 02111, USA *
***************************************************************************/
/*
* $OpenBSD: deroff.l,v 1.1 1997/03/08 01:29:08 kstailey Exp $
* $DebianId: deroff.l,v 1.1 1996/12/28 15:58:30 david Rel $
*/
/* Acknowledgments: The inclusion code is from the lex manpage. */
#include <stdio.h>
#include <stdlib.h>
#ifndef __OpenBSD__
# include <getopt.h>
#else
# include <errno.h>
#endif
#include <strings.h>
#include <ctype.h>
#include <locale.h>
#define VERSION "1.0"
#ifdef HAVE_GETOPT_LONG
struct option const long_options[] =
{
{"help", no_argument, 0, 'h'},
{"help", no_argument, 0, '?'},
{"version", no_argument, 0, 'V'},
{"wordlist", no_argument, 0, 'w'},
{(char *)0, no_argument, 0, (char)0}
};
#endif
char *progname;
unsigned int skip=0; /* we are in preprocessor material, skip it */
unsigned int line; /* current line */
unsigned int word=0; /* flag: output a word-by-word list */
char *yyname; /* name of current file */
/* from the flex manpage: */
#define MAX_INCLUDE_DEPTH 10
YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
int include_stack_ptr = 0;
%}
/* the "so" state is used for picking up the name of an `include' file,
the "nx" state is similarly used to pick up the name of a `next' file. */
%x nx so
D [[:digit:]]
WS [[:blank:]]
/* MC are 'macro characters', TC are 'troff characters' and
* CC is the (leading) 'control character'.
*
* Reference (for this whole section):
* Troff User's Manual
* Computing Sciences Technical Report No. 54
* AT&T Bell Laboratories, Murry Hill, New Jersey 07974.
* Revised November, 1992
*/
CC [.']
MC [A-Z][A-Za-z]*
TC [a-z0-9.()*]
%%
{CC}?\\\" /* ignore troff comments */ ;
^{CC}ft.* /* ignore font changing commands */ ;
\\f. /* ignore font changing commands */ ;
\\s[+-]?{D}+ /* ignore size changing commands */ ;
"\\(f"[ifl] if (skip == 0) fprintf(yyout,"f%c",yytext[3]);
/* ligature */
"\\(F"[il] if (skip == 0) fprintf(yyout,"ff%c",yytext[3]);
/* dito */
"\\(".. /* ignore symbols */ ;
\\[ |^0!] if (skip == 0) fputc(' ',yyout);
/* various blanks: full, half, quad, digit,
and transparent line. */
"\\"(-|"("(hy|mi|em)) if (skip == 0) fputc('-', yyout);
/* treat minus, hyphen and em-dash
(incorrectly) as - */
\\[e&%] /* ignore escape, zero-width, optional
hyphenation character */ ;
"\\*"[^(]|"\\*(".. /* ignore interpolation of ..?
(register variables in -ms)
NOTE: This is not very wise, as we
loose the accents!
\*['`^,:~] should be converted to
acute,grave,circumflex,cedilla,
umlaut, tilde accents. */ ;
\\${D} /* ignore interpolation of argument D */ ;
\\. /* drop the other various troff commands */ ;
^{CC}{WS}*nx BEGIN(nx); /* read in next file */
<nx>[^[:space:]]+ { /* got the include file name */
if (fclose(yyin) < 0) {
fprintf(stderr,
"%s: cannot close '%s': %s!\n",
progname, yyname, strerror(errno));
}
if (yytext[0] == '\0') {
fprintf(stderr,
"%s: .nx request without "\
"filename!\n", progname);
exit(1);
}
yyin=fopen(yytext, "r");
if (yyin == NULL) {
fprintf(stderr,
"%s: .nx request: "\
"cannot open '%s': %s!\n",
progname,yytext,strerror(errno));
exit(1);
}
yy_switch_to_buffer(
yy_create_buffer(yyin,YY_BUF_SIZE));
BEGIN(INITIAL);
}
^{CC}{WS}*so BEGIN(so);
<nx,so>{WS}* /* eat the whitespace */
<so>[^[:space:]]+ { /* got the include file name */
if (include_stack_ptr >= MAX_INCLUDE_DEPTH) {
fprintf(stderr,
"%s: .so-requests nested too "\
"deeply!\n",
progname );
exit(1);
}
include_stack[include_stack_ptr++] =
YY_CURRENT_BUFFER;
yyin=fopen(yytext, "r" );
if (yyin == NULL) {
fprintf(stderr,
"%s: .so request: "\
"cannot open '%s': %s!\n",
progname,yytext,strerror(errno));
exit(1);
}
yy_switch_to_buffer(
yy_create_buffer(yyin,YY_BUF_SIZE));
BEGIN(INITIAL);
}
^{CC}{WS}*de.* skip++; /* troff macro definition */
^{CC}("EQ"|[PTv]S|"G1") skip++;
^{CC}("EN"|[PTv]E|"G2") skip--;
^{WS}*".." skip--; /* end of troff macro definition */
/* XXX: macros have not necesserally
to end with ".." */
^{CC}{WS}*[a-ce-mo-rt-z]{TC}.* /* ignore troff commands including args,
.de, .nx and .so already handled above */ ;
^{CC}{WS}*(d[^e]|n[^x]|s[^o]).* /* ignore troff commands including args,
.de, .nx and .so already handled above */ ;
^{CC}{WS}*{MC}{WS}*[+-]?{D}* /* assume that this are macros, and throw
numeric arguments away. */ ;
[[:punct:]]?[[:blank:]]+ { if (skip == 0) {
if (!word) { ECHO; }
else fputc('\n', yyout);
}
}
. { if (skip == 0) {
if (!word) ECHO;
else {
char c=yytext[0];
if (isalnum(c) || (c == '\'')) {
fputc(c, yyout);
}
else if (ispunct(c)) {
fputc('\n', yyout);
}
}
}
}
\n { line++; if (skip == 0) ECHO; }
<<EOF>> { /* at end-of-file, if it was a .so
request, return to parent file */
if (--include_stack_ptr < 0) yyterminate();
else yy_delete_buffer(YY_CURRENT_BUFFER);
yy_switch_to_buffer(
include_stack[include_stack_ptr]);
}
%%
int yywrap()
{
return 1;
}
void yyerror(char *s)
{
fprintf(stderr,"%s: %s in line %d of %s\n", progname, s, line, yyname);
}
int usage(void)
{
fprintf(stderr, "usage:\n");
fprintf(stderr, " %s [-w] {file(s)}\n", progname);
fprintf(stderr, " %s -h|-V\n\n", progname);
fprintf(stderr, "options:\n");
fprintf(stderr, " -w output a word-list.\n");
fprintf(stderr, " -h output a this usage information.\n");
fprintf(stderr, " -V output copyright and license information.\n");
exit(1);
}
int warranty(void)
{
const char warranty[]="\
Copyright 1996 David Frey.\n\
This is free software; see the GNU General Public Licence version 2 or later\n\
for copying conditions. There is NO warranty.\n\n\
The code for .so and .nx inclusion was taken from the example code in the
flex(1) manual page.";
fprintf(stderr,"%s version %s.\n\n", progname, VERSION);
fprintf(stderr,"%s\n", warranty);
exit(0);
}
int main(int argc, char *argv[])
{
int c, i, res;
progname=strrchr(argv[0],'/');
if (progname==NULL) progname=argv[0];
else progname++;
yyout=stdout; /* just to clarify */
#ifdef HAVE_GETOPT_LONG
while ((c = getopt_long(argc, argv, "h?Vw",
long_options, (int *) 0)) != EOF)
#else
while ((c = getopt(argc, argv, "h?Vw")) != EOF)
#endif
{
switch (c) {
case 'h': case '?': usage(); break; /* NEVER REACHED */
case 'V': warranty(); break; /* NEVER REACHED */
case 'w': word=1; break;
case 0 : default : break;
}
}
setlocale(LC_ALL, "");
if (argc > optind) {
res=0;
for(i=optind; i<argc; i++) {
yyname=argv[i]; yyin=fopen(yyname,"r");
if (yyin == NULL) {
fprintf(stderr, "%s: cannot open '%s': %s.\n",
progname, yyname, strerror(errno));
}
else {
line=0; res += yylex();
if (fclose(yyin) < 0) {
fprintf(stderr, "%s: cannot close '%s': %s!\n",
progname, yyname, strerror(errno));
}
}
}
}
else {
yyin=stdin; yyout=stdout; yyname="stdin"; line=0; res=yylex();
}
return res;
}
|
