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// Copyright Vladimir Prus 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)
// This file defines template functions that are declared in
// ../value_semantic.hpp.
#include <boost/throw_exception.hpp>
namespace boost { namespace program_options {
extern BOOST_PROGRAM_OPTIONS_DECL std::string arg;
template<class T, class charT>
std::string
typed_value<T, charT>::name() const
{
std::string const& var = (m_value_name.empty() ? arg : m_value_name);
if (!m_implicit_value.empty() && !m_implicit_value_as_text.empty()) {
std::string msg = "[=" + var + "(=" + m_implicit_value_as_text + ")]";
if (!m_default_value.empty() && !m_default_value_as_text.empty())
msg += " (=" + m_default_value_as_text + ")";
return msg;
}
else if (!m_default_value.empty() && !m_default_value_as_text.empty()) {
return var + " (=" + m_default_value_as_text + ")";
} else {
return var;
}
}
template<class T, class charT>
void
typed_value<T, charT>::notify(const boost::any& value_store) const
{
const T* value = boost::any_cast<T>(&value_store);
if (m_store_to) {
*m_store_to = *value;
}
if (m_notifier) {
m_notifier(*value);
}
}
namespace validators {
/* If v.size() > 1, throw validation_error.
If v.size() == 1, return v.front()
Otherwise, returns a reference to a statically allocated
empty string if 'allow_empty' and throws validation_error
otherwise. */
template<class charT>
const std::basic_string<charT>& get_single_string(
const std::vector<std::basic_string<charT> >& v,
bool allow_empty = false)
{
static std::basic_string<charT> empty;
if (v.size() > 1)
boost::throw_exception(validation_error(validation_error::multiple_values_not_allowed));
else if (v.size() == 1)
return v.front();
else if (!allow_empty)
boost::throw_exception(validation_error(validation_error::at_least_one_value_required));
return empty;
}
/* Throws multiple_occurrences if 'value' is not empty. */
BOOST_PROGRAM_OPTIONS_DECL void
check_first_occurrence(const boost::any& value);
}
using namespace validators;
/** Validates 's' and updates 'v'.
@pre 'v' is either empty or in the state assigned by the previous
invocation of 'validate'.
The target type is specified via a parameter which has the type of
pointer to the desired type. This is workaround for compilers without
partial template ordering, just like the last 'long/int' parameter.
*/
template<class T, class charT>
void validate(boost::any& v,
const std::vector< std::basic_string<charT> >& xs,
T*, long)
{
validators::check_first_occurrence(v);
std::basic_string<charT> s(validators::get_single_string(xs));
try {
v = any(lexical_cast<T>(s));
}
catch(const bad_lexical_cast&) {
boost::throw_exception(invalid_option_value(s));
}
}
BOOST_PROGRAM_OPTIONS_DECL void validate(boost::any& v,
const std::vector<std::string>& xs,
bool*,
int);
#if !defined(BOOST_NO_STD_WSTRING)
BOOST_PROGRAM_OPTIONS_DECL void validate(boost::any& v,
const std::vector<std::wstring>& xs,
bool*,
int);
#endif
// For some reason, this declaration, which is require by the standard,
// cause msvc 7.1 to not generate code to specialization defined in
// value_semantic.cpp
#if ! ( BOOST_WORKAROUND(BOOST_MSVC, == 1310) )
BOOST_PROGRAM_OPTIONS_DECL void validate(boost::any& v,
const std::vector<std::string>& xs,
std::string*,
int);
#if !defined(BOOST_NO_STD_WSTRING)
BOOST_PROGRAM_OPTIONS_DECL void validate(boost::any& v,
const std::vector<std::wstring>& xs,
std::string*,
int);
#endif
#endif
/** Validates sequences. Allows multiple values per option occurrence
and multiple occurrences. */
template<class T, class charT>
void validate(boost::any& v,
const std::vector<std::basic_string<charT> >& s,
std::vector<T>*,
int)
{
if (v.empty()) {
v = boost::any(std::vector<T>());
}
std::vector<T>* tv = boost::any_cast< std::vector<T> >(&v);
assert(NULL != tv);
for (unsigned i = 0; i < s.size(); ++i)
{
try {
/* We call validate so that if user provided
a validator for class T, we use it even
when parsing vector<T>. */
boost::any a;
std::vector<std::basic_string<charT> > cv;
cv.push_back(s[i]);
validate(a, cv, (T*)0, 0);
tv->push_back(boost::any_cast<T>(a));
}
catch(const bad_lexical_cast& /*e*/) {
boost::throw_exception(invalid_option_value(s[i]));
}
}
}
template<class T, class charT>
void
typed_value<T, charT>::
xparse(boost::any& value_store,
const std::vector<std::basic_string<charT> >& new_tokens) const
{
// If no tokens were given, and the option accepts an implicit
// value, then assign the implicit value as the stored value;
// otherwise, validate the user-provided token(s).
if (new_tokens.empty() && !m_implicit_value.empty())
value_store = m_implicit_value;
else
validate(value_store, new_tokens, (T*)0, 0);
}
template<class T>
typed_value<T>*
value()
{
// Explicit qualification is vc6 workaround.
return boost::program_options::value<T>(0);
}
template<class T>
typed_value<T>*
value(T* v)
{
typed_value<T>* r = new typed_value<T>(v);
return r;
}
template<class T>
typed_value<T, wchar_t>*
wvalue()
{
return wvalue<T>(0);
}
template<class T>
typed_value<T, wchar_t>*
wvalue(T* v)
{
typed_value<T, wchar_t>* r = new typed_value<T, wchar_t>(v);
return r;
}
}}
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