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// Copyright Vladimir Prus 2002-2004.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)
#define BOOST_PROGRAM_OPTIONS_SOURCE
#include <boost/program_options/config.hpp>
#include <boost/program_options/detail/config_file.hpp>
#include <boost/program_options/errors.hpp>
#include <boost/program_options/detail/convert.hpp>
#include <boost/throw_exception.hpp>
#include <iostream>
#include <fstream>
#include <cassert>
namespace boost { namespace program_options { namespace detail {
using namespace std;
common_config_file_iterator::common_config_file_iterator(
const std::set<std::string>& allowed_options,
bool allow_unregistered)
: allowed_options(allowed_options),
m_allow_unregistered(allow_unregistered)
{
for(std::set<std::string>::const_iterator i = allowed_options.begin();
i != allowed_options.end();
++i)
{
add_option(i->c_str());
}
}
void
common_config_file_iterator::add_option(const char* name)
{
string s(name);
assert(!s.empty());
if (*s.rbegin() == '*') {
s.resize(s.size()-1);
bool bad_prefixes(false);
// If 's' is a prefix of one of allowed suffix, then
// lower_bound will return that element.
// If some element is prefix of 's', then lower_bound will
// return the next element.
set<string>::iterator i = allowed_prefixes.lower_bound(s);
if (i != allowed_prefixes.end()) {
if (i->find(s) == 0)
bad_prefixes = true;
}
if (i != allowed_prefixes.begin()) {
--i;
if (s.find(*i) == 0)
bad_prefixes = true;
}
if (bad_prefixes)
boost::throw_exception(error("options '" + string(name) + "' and '" +
*i + "*' will both match the same "
"arguments from the configuration file"));
allowed_prefixes.insert(s);
}
}
namespace {
string trim_ws(const string& s)
{
string::size_type n, n2;
n = s.find_first_not_of(" \t\r\n");
if (n == string::npos)
return string();
else {
n2 = s.find_last_not_of(" \t\r\n");
return s.substr(n, n2-n+1);
}
}
}
void common_config_file_iterator::get()
{
string s;
string::size_type n;
bool found = false;
while(this->getline(s)) {
// strip '#' comments and whitespace
if ((n = s.find('#')) != string::npos)
s = s.substr(0, n);
s = trim_ws(s);
if (!s.empty()) {
// Handle section name
if (*s.begin() == '[' && *s.rbegin() == ']') {
m_prefix = s.substr(1, s.size()-2);
if (*m_prefix.rbegin() != '.')
m_prefix += '.';
}
else if ((n = s.find('=')) != string::npos) {
string name = m_prefix + trim_ws(s.substr(0, n));
string value = trim_ws(s.substr(n+1));
bool registered = allowed_option(name);
if (!registered && !m_allow_unregistered)
boost::throw_exception(unknown_option(name));
found = true;
this->value().string_key = name;
this->value().value.clear();
this->value().value.push_back(value);
this->value().unregistered = !registered;
this->value().original_tokens.clear();
this->value().original_tokens.push_back(name);
this->value().original_tokens.push_back(value);
break;
} else {
boost::throw_exception(invalid_config_file_syntax(s, invalid_syntax::unrecognized_line));
}
}
}
if (!found)
found_eof();
}
bool
common_config_file_iterator::allowed_option(const std::string& s) const
{
set<string>::const_iterator i = allowed_options.find(s);
if (i != allowed_options.end())
return true;
// If s is "pa" where "p" is allowed prefix then
// lower_bound should find the element after "p".
// This depends on 'allowed_prefixes' invariant.
i = allowed_prefixes.lower_bound(s);
if (i != allowed_prefixes.begin() && s.find(*--i) == 0)
return true;
return false;
}
#if BOOST_WORKAROUND(__COMO_VERSION__, BOOST_TESTED_AT(4303)) || \
(defined(__sgi) && BOOST_WORKAROUND(_COMPILER_VERSION, BOOST_TESTED_AT(741)))
template<>
bool
basic_config_file_iterator<wchar_t>::getline(std::string& s)
{
std::wstring ws;
// On Comeau, using two-argument version causes
// call to some internal function with std::wstring, and '\n'
// (not L'\n') and compile can't resolve that call.
if (std::getline(*is, ws, L'\n')) {
s = to_utf8(ws);
return true;
} else {
return false;
}
}
#endif
}}}
#if 0
using boost::program_options::config_file;
#include <sstream>
#include <cassert>
int main()
{
try {
stringstream s(
"a = 1\n"
"b = 2\n");
config_file cf(s);
cf.add_option("a");
cf.add_option("b");
assert(++cf);
assert(cf.name() == "a");
assert(cf.value() == "1");
assert(++cf);
assert(cf.name() == "b");
assert(cf.value() == "2");
assert(!++cf);
}
catch(exception& e)
{
cout << e.what() << "\n";
}
}
#endif
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