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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)
#ifndef BOOST_CONFIG_FILE_VP_2003_01_02
#define BOOST_CONFIG_FILE_VP_2003_01_02
#include <iosfwd>
#include <string>
#include <set>
#include <boost/noncopyable.hpp>
#include <boost/program_options/config.hpp>
#include <boost/program_options/option.hpp>
#include <boost/program_options/eof_iterator.hpp>
#include <boost/detail/workaround.hpp>
#if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202))
#include <boost/program_options/detail/convert.hpp>
#endif
#if BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042))
#include <istream> // std::getline
#endif
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/shared_ptr.hpp>
namespace boost { namespace program_options { namespace detail {
/** Standalone parser for config files in ini-line format.
The parser is a model of single-pass lvalue iterator, and
default constructor creates past-the-end-iterator. The typical usage is:
config_file_iterator i(is, ... set of options ...), e;
for(; i !=e; ++i) {
*i;
}
Syntax conventions:
- config file can not contain positional options
- '#' is comment character: it is ignored together with
the rest of the line.
- variable assignments are in the form
name '=' value.
spaces around '=' are trimmed.
- Section names are given in brackets.
The actual option name is constructed by combining current section
name and specified option name, with dot between. If section_name
already contains dot at the end, new dot is not inserted. For example:
@verbatim
[gui.accessibility]
visual_bell=yes
@endverbatim
will result in option "gui.accessibility.visual_bell" with value
"yes" been returned.
TODO: maybe, we should just accept a pointer to options_description
class.
*/
class common_config_file_iterator
: public eof_iterator<common_config_file_iterator, option>
{
public:
common_config_file_iterator() { found_eof(); }
common_config_file_iterator(
const std::set<std::string>& allowed_options,
bool allow_unregistered = false);
virtual ~common_config_file_iterator() {}
public: // Method required by eof_iterator
void get();
protected: // Stubs for derived classes
// Obtains next line from the config file
// Note: really, this design is a bit ugly
// The most clean thing would be to pass 'line_iterator' to
// constructor of this class, but to avoid templating this class
// we'd need polymorphic iterator, which does not exist yet.
virtual bool getline(std::string&) { return false; }
private:
/** Adds another allowed option. If the 'name' ends with
'*', then all options with the same prefix are
allowed. For example, if 'name' is 'foo*', then 'foo1' and
'foo_bar' are allowed. */
void add_option(const char* name);
// Returns true if 's' is a registered option name.
bool allowed_option(const std::string& s) const;
// That's probably too much data for iterator, since
// it will be copied, but let's not bother for now.
std::set<std::string> allowed_options;
// Invariant: no element is prefix of other element.
std::set<std::string> allowed_prefixes;
std::string m_prefix;
bool m_allow_unregistered;
};
template<class charT>
class basic_config_file_iterator : public common_config_file_iterator {
public:
basic_config_file_iterator()
{
found_eof();
}
/** Creates a config file parser for the specified stream.
*/
basic_config_file_iterator(std::basic_istream<charT>& is,
const std::set<std::string>& allowed_options,
bool allow_unregistered = false);
private: // base overrides
bool getline(std::string&);
private: // internal data
shared_ptr<std::basic_istream<charT> > is;
};
typedef basic_config_file_iterator<char> config_file_iterator;
typedef basic_config_file_iterator<wchar_t> wconfig_file_iterator;
struct null_deleter
{
void operator()(void const *) const {}
};
template<class charT>
basic_config_file_iterator<charT>::
basic_config_file_iterator(std::basic_istream<charT>& is,
const std::set<std::string>& allowed_options,
bool allow_unregistered)
: common_config_file_iterator(allowed_options, allow_unregistered)
{
this->is.reset(&is, null_deleter());
get();
}
// Specializing this function for wchar_t causes problems on
// borland and vc7, as well as on metrowerks. On the first two
// I don't know a workaround, so make use of 'to_internal' to
// avoid specialization.
template<class charT>
bool
basic_config_file_iterator<charT>::getline(std::string& s)
{
std::basic_string<charT> in;
if (std::getline(*is, in)) {
s = to_internal(in);
return true;
} else {
return false;
}
}
// Specialization is needed to workaround getline bug on Comeau.
#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);
#endif
}}}
#endif
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Swift