381 lines
15 KiB
C++
381 lines
15 KiB
C++
//
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// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_LOCALE_CONVERTER_HPP_INCLUDED
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#define BOOST_LOCALE_CONVERTER_HPP_INCLUDED
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#include <boost/locale/config.hpp>
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#ifdef BOOST_MSVC
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# pragma warning(push)
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# pragma warning(disable : 4275 4251 4231 4660)
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#endif
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#include <locale>
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namespace boost {
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namespace locale {
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///
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/// \defgroup convert Text Conversions
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///
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/// This module provides various function for string manipulation like Unicode normalization, case conversion etc.
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/// @{
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///
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///
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/// \brief This class provides base flags for text manipulation. It is used as base for converter facet.
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///
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class converter_base {
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public:
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///
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/// The flag used for facet - the type of operation to perform
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///
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typedef enum {
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normalization, ///< Apply Unicode normalization on the text
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upper_case, ///< Convert text to upper case
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lower_case, ///< Convert text to lower case
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case_folding, ///< Fold case in the text
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title_case ///< Convert text to title case
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} conversion_type;
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};
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template<typename CharType>
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class converter;
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#ifdef BOOST_LOCALE_DOXYGEN
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///
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/// \brief The facet that implements text manipulation
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///
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/// It is used to performs text conversion operations defined by \ref conversion_type. It is specialized
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/// for four types of characters \c char, \c wchar_t, \c char16_t, \c char32_t
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///
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template<typename Char>
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class BOOST_LOCALE_DECL converter: public converter_base, public std::locale::facet {
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public:
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/// Locale identification
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static std::locale::id id;
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/// Standard constructor
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converter(size_t refs = 0) : std::locale::facet(refs)
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{
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}
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///
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/// Convert text in range [\a begin, \a end) according to conversion method \a how. Parameter
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/// \a flags is used for specification of normalization method like nfd, nfc etc.
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///
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virtual std::basic_string<Char> convert(conversion_type how,Char const *begin,Char const *end,int flags = 0) const = 0;
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#if defined (__SUNPRO_CC) && defined (_RWSTD_VER)
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std::locale::id& __get_id (void) const { return id; }
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#endif
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};
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#else
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template<>
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class BOOST_LOCALE_DECL converter<char> : public converter_base, public std::locale::facet {
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public:
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static std::locale::id id;
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converter(size_t refs = 0) : std::locale::facet(refs)
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{
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}
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virtual std::string convert(conversion_type how,char const *begin,char const *end,int flags = 0) const = 0;
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#if defined (__SUNPRO_CC) && defined (_RWSTD_VER)
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std::locale::id& __get_id (void) const { return id; }
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#endif
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};
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template<>
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class BOOST_LOCALE_DECL converter<wchar_t> : public converter_base, public std::locale::facet {
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public:
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static std::locale::id id;
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converter(size_t refs = 0) : std::locale::facet(refs)
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{
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}
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virtual std::wstring convert(conversion_type how,wchar_t const *begin,wchar_t const *end,int flags = 0) const = 0;
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#if defined (__SUNPRO_CC) && defined (_RWSTD_VER)
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std::locale::id& __get_id (void) const { return id; }
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#endif
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};
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#ifdef BOOST_LOCALE_ENABLE_CHAR16_T
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template<>
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class BOOST_LOCALE_DECL converter<char16_t> : public converter_base, public std::locale::facet {
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public:
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static std::locale::id id;
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converter(size_t refs = 0) : std::locale::facet(refs)
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{
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}
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virtual std::u16string convert(conversion_type how,char16_t const *begin,char16_t const *end,int flags = 0) const = 0;
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#if defined (__SUNPRO_CC) && defined (_RWSTD_VER)
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std::locale::id& __get_id (void) const { return id; }
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#endif
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};
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#endif
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#ifdef BOOST_LOCALE_ENABLE_CHAR32_T
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template<>
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class BOOST_LOCALE_DECL converter<char32_t> : public converter_base, public std::locale::facet {
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public:
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static std::locale::id id;
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converter(size_t refs = 0) : std::locale::facet(refs)
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{
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}
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virtual std::u32string convert(conversion_type how,char32_t const *begin,char32_t const *end,int flags = 0) const = 0;
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#if defined (__SUNPRO_CC) && defined (_RWSTD_VER)
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std::locale::id& __get_id (void) const { return id; }
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#endif
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};
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#endif
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#endif
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///
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/// The type that defined <a href="http://unicode.org/reports/tr15/#Norm_Forms">normalization form</a>
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///
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typedef enum {
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norm_nfd, ///< Canonical decomposition
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norm_nfc, ///< Canonical decomposition followed by canonical composition
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norm_nfkd, ///< Compatibility decomposition
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norm_nfkc, ///< Compatibility decomposition followed by canonical composition.
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norm_default = norm_nfc, ///< Default normalization - canonical decomposition followed by canonical composition
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} norm_type;
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///
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/// Normalize Unicode string \a str according to \ref norm_type "normalization form" \a n
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///
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/// Note: This function receives only Unicode strings, i.e.: UTF-8, UTF-16 or UTF-32. It does not take
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/// in account the locale encoding, because Unicode decomposition and composition are meaningless outside
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/// of a Unicode character set.
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> normalize(std::basic_string<CharType> const &str,norm_type n=norm_default,std::locale const &loc=std::locale())
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{
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::normalization,str.data(),str.data() + str.size(),n);
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}
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///
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/// Normalize NUL terminated Unicode string \a str according to \ref norm_type "normalization form" \a n
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///
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/// Note: This function receives only Unicode strings, i.e.: UTF-8, UTF-16 or UTF-32. It does not take
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/// in account the locale encoding, because Unicode decomposition and composition are meaningless outside
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/// of a Unicode character set.
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> normalize(CharType const *str,norm_type n=norm_default,std::locale const &loc=std::locale())
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{
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CharType const *end=str;
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while(*end)
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end++;
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::normalization,str,end,n);
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}
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///
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/// Normalize Unicode string in range [begin,end) according to \ref norm_type "normalization form" \a n
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///
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/// Note: This function receives only Unicode strings, i.e.: UTF-8, UTF-16 or UTF-32. It does not take
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/// in account the locale encoding, because Unicode decomposition and composition are meaningless outside
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/// of a Unicode character set.
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> normalize( CharType const *begin,
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CharType const *end,
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norm_type n=norm_default,
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std::locale const &loc=std::locale())
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{
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::normalization,begin,end,n);
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}
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///////////////////////////////////////////////////
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///
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/// Convert a string \a str to upper case according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> to_upper(std::basic_string<CharType> const &str,std::locale const &loc=std::locale())
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{
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::upper_case,str.data(),str.data()+str.size());
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}
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///
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/// Convert a NUL terminated string \a str to upper case according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> to_upper(CharType const *str,std::locale const &loc=std::locale())
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{
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CharType const *end=str;
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while(*end)
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end++;
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::upper_case,str,end);
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}
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///
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/// Convert a string in range [begin,end) to upper case according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> to_upper(CharType const *begin,CharType const *end,std::locale const &loc=std::locale())
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{
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::upper_case,begin,end);
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}
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///////////////////////////////////////////////////
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///
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/// Convert a string \a str to lower case according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> to_lower(std::basic_string<CharType> const &str,std::locale const &loc=std::locale())
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{
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::lower_case,str.data(),str.data()+str.size());
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}
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///
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/// Convert a NUL terminated string \a str to lower case according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> to_lower(CharType const *str,std::locale const &loc=std::locale())
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{
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CharType const *end=str;
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while(*end)
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end++;
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::lower_case,str,end);
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}
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///
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/// Convert a string in range [begin,end) to lower case according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> to_lower(CharType const *begin,CharType const *end,std::locale const &loc=std::locale())
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{
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::lower_case,begin,end);
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}
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///////////////////////////////////////////////////
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///
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/// Convert a string \a str to title case according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> to_title(std::basic_string<CharType> const &str,std::locale const &loc=std::locale())
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{
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::title_case,str.data(),str.data()+str.size());
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}
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///
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/// Convert a NUL terminated string \a str to title case according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> to_title(CharType const *str,std::locale const &loc=std::locale())
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{
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CharType const *end=str;
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while(*end)
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end++;
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::title_case,str,end);
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}
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///
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/// Convert a string in range [begin,end) to title case according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> to_title(CharType const *begin,CharType const *end,std::locale const &loc=std::locale())
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{
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::title_case,begin,end);
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}
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///////////////////////////////////////////////////
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///
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/// Fold case of a string \a str according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> fold_case(std::basic_string<CharType> const &str,std::locale const &loc=std::locale())
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{
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::case_folding,str.data(),str.data()+str.size());
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}
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///
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/// Fold case of a NUL terminated string \a str according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> fold_case(CharType const *str,std::locale const &loc=std::locale())
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{
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CharType const *end=str;
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while(*end)
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end++;
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::case_folding,str,end);
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}
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///
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/// Fold case of a string in range [begin,end) according to locale \a loc
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///
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/// \note throws std::bad_cast if loc does not have \ref converter facet installed
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///
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template<typename CharType>
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std::basic_string<CharType> fold_case(CharType const *begin,CharType const *end,std::locale const &loc=std::locale())
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{
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return std::use_facet<converter<CharType> >(loc).convert(converter_base::case_folding,begin,end);
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}
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///
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///@}
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///
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} // locale
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} // boost
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#ifdef BOOST_MSVC
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#pragma warning(pop)
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#endif
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#endif
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///
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/// \example conversions.cpp
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///
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/// Example of using various text conversion functions.
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///
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/// \example wconversions.cpp
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///
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/// Example of using various text conversion functions with wide strings.
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///
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// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
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