132 lines
3.9 KiB
C++
132 lines
3.9 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2015 Danny Robson <danny@nerdcruft.net>
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*/
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#if defined(__UTIL_FORMAT_IPP)
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#error
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#endif
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#define __UTIL_FORMAT_IPP
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#include "debug.hpp"
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#include <algorithm>
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#include <sstream>
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#include <stdexcept>
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#include <iterator>
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namespace util {
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namespace detail { namespace format {
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///////////////////////////////////////////////////////////////////////
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template <typename T>
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inline bool
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is_valid_specifier (const char*)
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{ return false; }
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//---------------------------------------------------------------------
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template <>
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inline bool
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is_valid_specifier<const char*> (const char *s)
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{ return *s == 's'; }
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//---------------------------------------------------------------------
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template <>
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inline bool
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is_valid_specifier<char*> (const char *s)
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{ return *s == 's'; }
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//---------------------------------------------------------------------
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template <>
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inline bool
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is_valid_specifier<std::string> (const char *s)
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{ return *s == 's'; }
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//---------------------------------------------------------------------
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template <>
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inline bool
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is_valid_specifier<size_t> (const char *s)
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{ return *s == 'u'; }
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///////////////////////////////////////////////////////////////////////
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template <typename InputIt>
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void
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render (InputIt first,
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InputIt last,
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std::ostringstream &dest)
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{
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static const char DELIMITER = '%';
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if (std::find (first, last, DELIMITER) != last)
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throw util::format::missing_error ("format specifier without value");
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std::copy (first, last, std::ostream_iterator<char> (dest));
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}
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//---------------------------------------------------------------------
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template <typename InputIt,
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typename ValueT,
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typename ...Args>
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void
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render (InputIt first,
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InputIt last,
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std::ostringstream &dest,
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const ValueT& val,
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Args&& ...args)
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{
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CHECK (first <= last);
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static const char DELIMITER = '%';
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auto cursor = std::find (first, last, DELIMITER);
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std::copy (first, cursor, std::ostream_iterator<char> (dest));
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if (cursor == last)
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return;
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auto spec = cursor + 1;
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if (spec == last)
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throw util::format::format_error ("missing format specifier");
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if (!is_valid_specifier<typename std::decay<ValueT>::type> (&*spec))
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throw util::format::format_error ("invalid/unhandled format specifier");
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dest << val;
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render (spec + 1, last, dest, std::forward<Args> (args)...);
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}
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} }
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///////////////////////////////////////////////////////////////////////////
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namespace format {
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template <typename ...Args>
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std::string
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render (const std::string &fmt, Args&&... args)
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{
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std::ostringstream out;
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util::detail::format::render (
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fmt.begin (),
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fmt.end (),
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out,
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std::forward<Args> (args)...
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);
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return out.str ();
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}
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}
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}
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