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/*
* Copyright (c) 2003-2009, John Wiegley. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of New Artisans LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @addtogroup utils
*/
/**
* @file unistring.h
* @author John Wiegley
*
* @ingroup utils
*
* @brief Brief
*
* Long.
*/
#ifndef _UNISTRING_H
#define _UNISTRING_H
#include "utils.h"
namespace ledger {
/**
* @class unistring
*
* @brief Abstract working with UTF-32 encoded Unicode strings
*
* The input to the string is a UTF8 encoded ledger::string, which can
* then have its true length be taken, or characters extracted.
*/
class unistring
{
std::vector<boost::uint32_t> utf32chars;
public:
unistring(const std::string& input)
{
TRACE_CTOR(unistring, "");
const char * p = input.c_str();
std::size_t len = input.length();
VERIFY(utf8::is_valid(p, p + len));
utf8::utf8to32(p, p + len, std::back_inserter(utf32chars));
}
~unistring() {
TRACE_DTOR(unistring);
}
std::size_t length() const {
return utf32chars.size();
}
std::string extract(const std::size_t begin = 0,
const std::size_t len = 0) const
{
std::string utf8result;
std::size_t this_len = length();
assert(begin <= this_len);
assert(begin + len <= this_len);
if (this_len)
utf8::utf32to8(utf32chars.begin() + begin,
utf32chars.begin() + begin +
(len ? (len > this_len ? this_len : len) : this_len),
std::back_inserter(utf8result));
return utf8result;
}
};
inline void justify(std::ostream& out,
const std::string& str,
int width,
bool right = false)
{
if (! right)
out << str;
unistring temp(str);
int spacing = width - int(temp.length());
while (spacing-- > 0)
out << ' ';
if (right)
out << str;
}
} // namespace ledger
#endif // _UNISTRING_H
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