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/*
** SWISH++
** conf_filter.c
**
** Copyright (C) 1998 Paul J. Lucas
**
** 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
// standard
#include <cstdlib> /* for exit(2) */
#include <cstring>
// local
#include "exit_codes.h"
#include "conf_filter.h"
#include "platform.h"
using namespace std;
//*****************************************************************************
//
// SYNOPSIS
//
/* virtual */ void conf_filter::parse_value( char *line )
//
// DESCRIPTION
//
// Parse a conf_filter configuration file line. The format of such a line
// is:
//
// pattern command
//
// where "pattern" is a pattern and "command" is the command-line for
// executing the filter on a file.
//
// Furthermore, ensure the filter contains % and @ filename substitutions.
//
// PARAMETERS
//
// line The line to be parsed.
//
//*****************************************************************************
{
char const *const pattern = ::strtok( line, " \r\t" );
if ( !pattern ) {
error() << "no pattern\n";
::exit( Exit_Config_File );
}
char const *const command = ::strtok( 0, "\n" );
if ( !command ) {
error() << "no filter command\n";
::exit( Exit_Config_File );
}
//
// Check a filter command's %@ substitutions to ensure they're valid,
// that there are at least two of them, and that exactly one of them is
// a @ meaning the target filename. Also ignore %% or @@ respresenting
// literal @ or %, respectively.
//
bool found_target = false;
int num_substitutions = 0;
for ( register char const*
s = command; *s && ( s = ::strpbrk( s, "%@" ) ); ++s
) {
if ( s[0] == s[1] ) { // %% or @@ ...
++s; // ... skip past it
continue;
}
if ( *s == '@' )
if ( found_target ) {
error() << "more than one @\n";
::exit( Exit_Config_File );
} else {
found_target = true;
continue;
}
switch ( s[1] ) {
case 'b':
case 'B':
case 'e':
case 'E':
case 'f':
case 'F':
++num_substitutions;
continue;
}
error() << "non-[bBeEfF%] character after %\n";
::exit( Exit_Config_File );
}
if ( num_substitutions < 1 ) {
error() << "at least 1 substitution is required\n";
::exit( Exit_Config_File );
}
if ( !found_target ) {
error() << "filter does not contain required @\n";
::exit( Exit_Config_File );
}
map_.insert( map_type::value_type(
::strdup( pattern ), value_type( ::strdup( command ) )
) );
}
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