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/*
* Copyright (C) 2000,2003 Daniel Heck
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "ecl_argp.hh"
#include <iostream>
using namespace std;
using ecl::ArgParser;
ArgParser::ArgParser() {
}
ArgParser::~ArgParser(){
}
void ArgParser::on_error (ErrorType t, const std::string &arg) {
cerr << "Error: " << errormsg(t, arg) << endl;
}
void ArgParser::on_argument (const std::string &/*arg*/) {
}
void ArgParser::on_option (int /*id*/, const std::string &/*param*/)
{
}
void ArgParser::def (int id, const std::string &name,
char abbr, bool takesparam)
{
m_opts.push_back (Option(id, abbr, string("--") + name, takesparam));
}
void ArgParser::def (bool *boolvar, const std::string &name,
char abbr)
{
Option opt(-1, abbr, string("--") + name, false);
opt.boolvar = boolvar;
m_opts.push_back(opt);
}
string ArgParser::errormsg(ErrorType t, const std::string &arg) const {
string errmsg;
switch (t) {
case InvalidParam: errmsg = "Invalid parameter for option `"; break;
case AmbiguousOpt: errmsg = "Ambiguous command line option `"; break;
case UnknownOpt: errmsg = "Unknown command line option `"; break;
case MissingParam: errmsg = "Missing parameter for option `"; break;
default:
return string();
}
errmsg += arg;
errmsg += "'.";
return errmsg;
}
void ArgParser::process_option(Option &opt, const std::string ¶m) {
if (opt.boolvar)
*opt.boolvar = true;
else
on_option(opt.id, param);
}
void ArgParser::getlongopt (const std::string &arg) {
string::const_iterator eqpos = find(arg.begin(), arg.end(), '=');
string optname(arg.begin(), eqpos);
option_iterator i, j;
j = i = find_prefix (m_opts.begin(), m_opts.end(), optname);
if (i == m_opts.end()) {
on_error (UnknownOpt, optname);
}
else if (find_prefix(++j, m_opts.end(), optname) != m_opts.end()) {
on_error (AmbiguousOpt, optname);
}
else if (i->takesparam) {
if (eqpos != arg.end()) {
process_option (*i, string(eqpos+1, arg.end()));
}
else if (!m_arglist.empty()) {
process_option (*i, m_arglist.front());
m_arglist.pop_front();
}
else
on_error (MissingParam, optname);
}
else if (eqpos != arg.end()) {
on_error (InvalidParam, optname);
}
else
process_option(*i, "");
}
void ArgParser::getshortopt (const std::string &arg) {
option_iterator i = m_opts.begin();
for (; i != m_opts.end(); ++i)
if (i->shortopt == arg[1])
break;
string option = arg.substr(0, 2);
if (i == m_opts.end()) {
on_error (UnknownOpt, option);
}
else if (i->takesparam) {
string param = arg.substr(2);
if (param.empty()) {
if (!m_arglist.empty()) {
param = m_arglist.front();
m_arglist.pop_front();
process_option (*i, param);
}
else
on_error (MissingParam, option);
} else
process_option (*i, param);
}
else {
process_option (*i, "");
// The following characters can be options in their own right
// (single-character options can be grouped, as in -hvx), so
// put them back into the argument list.
std::string newarg("-");
newarg.append(arg.begin()+2, arg.end());
if (newarg != "-")
m_arglist.push_front(newarg);
}
}
void ArgParser::parse () {
bool no_more_opts = false;
while (!m_arglist.empty()) {
std::string arg = m_arglist.front();
m_arglist.pop_front();
if (!no_more_opts && arg.size() >= 2 && arg[0] == '-') {
// Note: "-" is treated as an ordinary argument
if (arg[1] == '-') {
if (arg.size() == 2) // "--" terminates the option list
no_more_opts = true;
else
getlongopt (arg);
}
else
getshortopt (arg);
}
else
on_argument (arg);
}
}
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