206 lines
6.9 KiB
Plaintext
206 lines
6.9 KiB
Plaintext
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// Copyright Vladimir Prus 2004.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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// This file defines template functions that are declared in
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// ../value_semantic.hpp.
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#include <boost/throw_exception.hpp>
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namespace boost { namespace program_options {
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extern BOOST_PROGRAM_OPTIONS_DECL std::string arg;
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template<class T, class charT>
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std::string
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typed_value<T, charT>::name() const
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{
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std::string const& var = (m_value_name.empty() ? arg : m_value_name);
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if (!m_implicit_value.empty() && !m_implicit_value_as_text.empty()) {
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std::string msg = "[=" + var + "(=" + m_implicit_value_as_text + ")]";
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if (!m_default_value.empty() && !m_default_value_as_text.empty())
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msg += " (=" + m_default_value_as_text + ")";
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return msg;
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}
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else if (!m_default_value.empty() && !m_default_value_as_text.empty()) {
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return var + " (=" + m_default_value_as_text + ")";
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} else {
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return var;
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}
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}
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template<class T, class charT>
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void
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typed_value<T, charT>::notify(const boost::any& value_store) const
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{
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const T* value = boost::any_cast<T>(&value_store);
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if (m_store_to) {
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*m_store_to = *value;
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}
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if (m_notifier) {
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m_notifier(*value);
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}
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}
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namespace validators {
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/* If v.size() > 1, throw validation_error.
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If v.size() == 1, return v.front()
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Otherwise, returns a reference to a statically allocated
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empty string if 'allow_empty' and throws validation_error
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otherwise. */
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template<class charT>
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const std::basic_string<charT>& get_single_string(
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const std::vector<std::basic_string<charT> >& v,
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bool allow_empty = false)
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{
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static std::basic_string<charT> empty;
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if (v.size() > 1)
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boost::throw_exception(validation_error(validation_error::multiple_values_not_allowed));
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else if (v.size() == 1)
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return v.front();
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else if (!allow_empty)
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boost::throw_exception(validation_error(validation_error::at_least_one_value_required));
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return empty;
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}
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/* Throws multiple_occurrences if 'value' is not empty. */
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BOOST_PROGRAM_OPTIONS_DECL void
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check_first_occurrence(const boost::any& value);
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}
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using namespace validators;
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/** Validates 's' and updates 'v'.
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@pre 'v' is either empty or in the state assigned by the previous
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invocation of 'validate'.
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The target type is specified via a parameter which has the type of
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pointer to the desired type. This is workaround for compilers without
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partial template ordering, just like the last 'long/int' parameter.
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*/
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template<class T, class charT>
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void validate(boost::any& v,
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const std::vector< std::basic_string<charT> >& xs,
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T*, long)
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{
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validators::check_first_occurrence(v);
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std::basic_string<charT> s(validators::get_single_string(xs));
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try {
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v = any(lexical_cast<T>(s));
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}
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catch(const bad_lexical_cast&) {
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boost::throw_exception(invalid_option_value(s));
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}
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}
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BOOST_PROGRAM_OPTIONS_DECL void validate(boost::any& v,
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const std::vector<std::string>& xs,
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bool*,
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int);
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#if !defined(BOOST_NO_STD_WSTRING)
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BOOST_PROGRAM_OPTIONS_DECL void validate(boost::any& v,
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const std::vector<std::wstring>& xs,
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bool*,
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int);
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#endif
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// For some reason, this declaration, which is require by the standard,
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// cause msvc 7.1 to not generate code to specialization defined in
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// value_semantic.cpp
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#if ! ( BOOST_WORKAROUND(BOOST_MSVC, == 1310) )
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BOOST_PROGRAM_OPTIONS_DECL void validate(boost::any& v,
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const std::vector<std::string>& xs,
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std::string*,
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int);
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#if !defined(BOOST_NO_STD_WSTRING)
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BOOST_PROGRAM_OPTIONS_DECL void validate(boost::any& v,
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const std::vector<std::wstring>& xs,
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std::string*,
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int);
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#endif
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#endif
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/** Validates sequences. Allows multiple values per option occurrence
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and multiple occurrences. */
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template<class T, class charT>
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void validate(boost::any& v,
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const std::vector<std::basic_string<charT> >& s,
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std::vector<T>*,
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int)
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{
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if (v.empty()) {
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v = boost::any(std::vector<T>());
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}
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std::vector<T>* tv = boost::any_cast< std::vector<T> >(&v);
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assert(NULL != tv);
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for (unsigned i = 0; i < s.size(); ++i)
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{
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try {
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/* We call validate so that if user provided
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a validator for class T, we use it even
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when parsing vector<T>. */
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boost::any a;
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std::vector<std::basic_string<charT> > cv;
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cv.push_back(s[i]);
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validate(a, cv, (T*)0, 0);
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tv->push_back(boost::any_cast<T>(a));
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}
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catch(const bad_lexical_cast& /*e*/) {
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boost::throw_exception(invalid_option_value(s[i]));
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}
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}
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}
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template<class T, class charT>
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void
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typed_value<T, charT>::
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xparse(boost::any& value_store,
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const std::vector<std::basic_string<charT> >& new_tokens) const
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{
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// If no tokens were given, and the option accepts an implicit
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// value, then assign the implicit value as the stored value;
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// otherwise, validate the user-provided token(s).
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if (new_tokens.empty() && !m_implicit_value.empty())
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value_store = m_implicit_value;
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else
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validate(value_store, new_tokens, (T*)0, 0);
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}
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template<class T>
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typed_value<T>*
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value()
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{
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// Explicit qualification is vc6 workaround.
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return boost::program_options::value<T>(0);
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}
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template<class T>
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typed_value<T>*
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value(T* v)
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{
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typed_value<T>* r = new typed_value<T>(v);
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return r;
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}
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template<class T>
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typed_value<T, wchar_t>*
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wvalue()
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{
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return wvalue<T>(0);
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}
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template<class T>
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typed_value<T, wchar_t>*
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wvalue(T* v)
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{
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typed_value<T, wchar_t>* r = new typed_value<T, wchar_t>(v);
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return r;
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}
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}}
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