forked from boostorg/regex
400 lines
11 KiB
C++
400 lines
11 KiB
C++
/*
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*
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* Copyright (c) 2004
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* Dr John Maddock
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*
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* Use, modification and distribution are subject to the
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* Boost Software License, Version 1.0. (See accompanying file
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* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*
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*/
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/*
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* LOCATION: see http://www.boost.org for most recent version.
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* FILE cpp_regex_traits.hpp
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* VERSION see <boost/version.hpp>
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* DESCRIPTION: Declares regular expression traits class cpp_regex_traits.
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*/
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#ifndef BOOST_CPP_REGEX_TRAITS_HPP_INCLUDED
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#define BOOST_CPP_REGEX_TRAITS_HPP_INCLUDED
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#ifndef BOOST_REGEX_TRAITS_DEFAULTS_HPP_INCLUDED
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#include <boost/regex/v4/regex_traits_defaults.hpp>
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#endif
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#ifdef BOOST_HAS_THREADS
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#include <boost/regex/static_mutex.hpp>
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#endif
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namespace boost{
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//
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// forward declaration is needed by some compilers:
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//
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template <class charT>
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class cpp_regex_traits;
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namespace re_detail{
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//
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// class cpp_regex_traits_base:
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// acts as a container for locale and the facets we are using.
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//
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template <class charT>
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struct cpp_regex_traits_base
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{
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cpp_regex_traits_base(const std::locale& l)
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{ imbue(l); }
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std::locale imbue(const std::locale& l);
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std::locale m_locale;
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std::ctype<charT> const* m_pctype;
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std::messages<charT> const* m_pmessages;
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std::collate<charT> const* m_pcollate;
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};
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template <class charT>
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std::locale cpp_regex_traits_base<charT>::imbue(const std::locale& l)
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{
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std::locale result(m_locale);
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m_locale = l;
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m_pctype = &BOOST_USE_FACET(std::ctype<charT>, l);
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m_pmessages = &BOOST_USE_FACET(std::messages<charT>, l);
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m_pcollate = &BOOST_USE_FACET(std::collate<charT>, l);
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return result;
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}
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//
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// class cpp_regex_traits_char_layer:
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// implements methods that require specialisation for narrow characters:
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//
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template <class charT>
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class cpp_regex_traits_char_layer : public cpp_regex_traits_base<charT>
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{
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typedef std::basic_string<charT> string_type;
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typedef std::map<charT, regex_constants::syntax_type> map_type;
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typedef typename map_type::const_iterator map_iterator_type;
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public:
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cpp_regex_traits_char_layer(const std::locale& l);
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regex_constants::syntax_type syntax_type(charT c)const
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{
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map_iterator_type i = m_char_map.find(c);
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return ((i == m_char_map.end()) ? 0 : i->second);
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}
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regex_constants::escape_syntax_type escape_syntax_type(charT c) const
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{
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map_iterator_type i = m_char_map.find(c);
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if(i == m_char_map.end())
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{
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if(this->m_pctype->is(std::ctype_base::lower, c)) return regex_constants::escape_type_class;
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if(this->m_pctype->is(std::ctype_base::upper, c)) return regex_constants::escape_type_not_class;
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return 0;
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}
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return i->second;
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}
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private:
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string_type get_default_message(regex_constants::syntax_type);
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// TODO: use a hash table when available!
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map_type m_char_map;
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};
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template <class charT>
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cpp_regex_traits_char_layer<charT>::cpp_regex_traits_char_layer(const std::locale& l)
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: cpp_regex_traits_base<charT>(l)
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{
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// we need to start by initialising our syntax map so we know which
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// character is used for which purpose:
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#ifndef __IBMCPP__
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typename std::messages<charT>::catalog cat = static_cast<std::messages<char>::catalog>(-1);
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#else
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typename std::messages<charT>::catalog cat = reinterpret_cast<std::messages<char>::catalog>(-1);
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#endif
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std::string cat_name(cpp_regex_traits<charT>::get_catalog_name());
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if(cat_name.size())
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{
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cat = this->m_pmessages->open(
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cat_name,
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this->m_locale);
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if((int)cat < 0)
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{
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std::string m("Unable to open message catalog: ");
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std::runtime_error err(m + cat_name);
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boost::throw_exception(err);
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}
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}
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//
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// if we have a valid catalog then load our messages:
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//
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if((int)cat >= 0)
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{
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try{
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for(regex_constants::syntax_type i = 1; i < regex_constants::syntax_max; ++i)
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{
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string_type mss = this->m_pmessages->get(cat, 0, i, get_default_message(i));
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for(typename string_type::size_type j = 0; j < mss.size(); ++j)
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{
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m_char_map[mss[j]] = i;
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}
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}
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this->m_pmessages->close(cat);
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}
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catch(...)
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{
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this->m_pmessages->close(cat);
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throw;
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}
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}
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else
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{
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for(regex_constants::syntax_type i = 1; i < regex_constants::syntax_max; ++i)
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{
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const char* ptr = get_default_syntax(i);
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while(ptr && *ptr)
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{
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m_char_map[this->m_pctype->widen(*ptr)] = i;
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++ptr;
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}
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}
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}
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}
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template <class charT>
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typename cpp_regex_traits_char_layer<charT>::string_type
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cpp_regex_traits_char_layer<charT>::get_default_message(regex_constants::syntax_type i)
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{
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const char* ptr = get_default_syntax(i);
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string_type result;
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while(ptr && *ptr)
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{
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result.append(1, this->m_pctype->widen(*ptr));
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++ptr;
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}
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return result;
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}
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//
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// specialised version for narrow characters:
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//
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template <>
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class cpp_regex_traits_char_layer<char> : public cpp_regex_traits_base<char>
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{
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typedef std::string string_type;
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public:
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cpp_regex_traits_char_layer(const std::locale& l)
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: cpp_regex_traits_base<char>(l)
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{
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init();
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}
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regex_constants::syntax_type syntax_type(char c)const
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{
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return m_char_map[static_cast<unsigned char>(c)];
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}
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regex_constants::escape_syntax_type escape_syntax_type(char c) const
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{
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return m_char_map[static_cast<unsigned char>(c)];
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}
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private:
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regex_constants::syntax_type m_char_map[1u << CHAR_BIT];
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void init();
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};
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//
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// class cpp_regex_traits_implementation:
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// provides pimpl implementation for cpp_regex_traits.
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//
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template <class charT>
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class cpp_regex_traits_implementation : public cpp_regex_traits_char_layer<charT>
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{
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public:
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cpp_regex_traits_implementation();
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cpp_regex_traits_implementation(const std::locale& l) : cpp_regex_traits_char_layer<charT>(l){}
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std::string error_string(regex_constants::error_type n) const
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{
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if(!m_error_strings.empty())
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{
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std::map<int, std::string>::const_iterator p = m_error_strings.find(n);
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return (p == m_error_strings.end()) ? std::string(get_default_error_string(n)) : p->second;
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}
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return get_default_error_string(n);
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}
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private:
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std::map<int, std::string> m_error_strings;
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};
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template <class charT>
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cpp_regex_traits_implementation<charT>::cpp_regex_traits_implementation()
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{
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#ifndef __IBMCPP__
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typename std::messages<charT>::catalog cat = static_cast<std::messages<char>::catalog>(-1);
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#else
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typename std::messages<charT>::catalog cat = reinterpret_cast<std::messages<char>::catalog>(-1);
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#endif
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std::string cat_name(cpp_regex_traits<charT>::get_catalog_name());
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if(cat_name.size())
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{
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cat = this->m_pmessages->open(
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cat_name,
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this->m_locale);
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if((int)cat < 0)
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{
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std::string m("Unable to open message catalog: ");
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std::runtime_error err(m + cat_name);
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boost::throw_exception(err);
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}
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}
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//
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// if we have a valid catalog then load our messages:
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//
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if((int)cat >= 0)
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{
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for(int i = 0; i <= boost::regex_constants::error_unknown; ++i)
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{
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std::string s = this->m_pmessages->get(cat, 0, i+200, get_default_error_string(i));
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m_error_strings[i] = s;
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}
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}
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}
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template <class charT>
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boost::shared_ptr<cpp_regex_traits_implementation<charT> > create_cpp_regex_traits(const std::locale& l)
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{
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// TODO: create a cache for previously constructed objects.
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return boost::shared_ptr<cpp_regex_traits_implementation<charT> >(new cpp_regex_traits_implementation<charT>(l));
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}
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} // re_detail
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template <class charT>
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class cpp_regex_traits
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{
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private:
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typedef std::ctype<charT> ctype_type;
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public:
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typedef charT char_type;
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typedef std::size_t size_type;
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typedef std::basic_string<char_type> string_type;
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typedef std::locale locale_type;
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typedef typename ctype_type::mask char_class_type;
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cpp_regex_traits()
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: m_pimpl(re_detail::create_cpp_regex_traits<charT>(std::locale()))
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{ }
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static size_type length(const char_type* p)
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{
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return std::char_traits<charT>::length(p);
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}
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regex_constants::syntax_type syntax_type(charT c)const
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{
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return m_pimpl->syntax_type(c);
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}
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regex_constants::escape_syntax_type escape_syntax_type(charT c) const
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{
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return m_pimpl->escape_syntax_type(c);
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}
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charT translate(charT c, bool icase) const
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{
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return icase ? m_pimpl->m_pctype->tolower(c) : c;
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}
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string_type transform(const charT* p1, const charT* p2) const
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{
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return m_pimpl->m_pcollate->transform(p1, p2);
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}
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string_type transform_primary(const charT* , const charT* ) const
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{
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return string_type();
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}
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char_class_type lookup_classname(const charT* p1, const charT* p2) const
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{
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return 0;
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}
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string_type lookup_collatename(const charT* p1, const charT* p2) const
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{
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return string_type();
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}
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bool is_class(charT c, char_class_type f) const
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{
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return false;
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}
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int value(charT) const
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{
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return -1;
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}
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locale_type imbue(locale_type l)
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{
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std::locale result(getloc());
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m_pimpl = re_detail::create_cpp_regex_traits<charT>(l);
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return result;
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}
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locale_type getloc()const
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{
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return m_pimpl->m_locale;
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}
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std::string error_string(regex_constants::error_type n) const
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{
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return m_pimpl->error_string(n);
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}
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//
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// extension:
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// set the name of the message catalog in use (defaults to "boost_regex").
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//
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static std::string catalog_name(const std::string& name);
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static std::string get_catalog_name();
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private:
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boost::shared_ptr<re_detail::cpp_regex_traits_implementation<charT> > m_pimpl;
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//
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// catalog name handler:
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//
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static std::string& get_catalog_name_inst();
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#ifdef BOOST_HAS_THREADS
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static static_mutex& get_mutex_inst();
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#endif
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};
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template <class charT>
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std::string cpp_regex_traits<charT>::catalog_name(const std::string& name)
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{
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#ifdef BOOST_HAS_THREADS
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static_mutex::scoped_lock lk(get_mutex_inst());
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#endif
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std::string result(get_catalog_name_inst());
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get_catalog_name_inst() = name;
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return result;
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}
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template <class charT>
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std::string& cpp_regex_traits<charT>::get_catalog_name_inst()
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{
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static std::string s_name;
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return s_name;
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}
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template <class charT>
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std::string cpp_regex_traits<charT>::get_catalog_name()
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{
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#ifdef BOOST_HAS_THREADS
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static_mutex::scoped_lock lk(get_mutex_inst());
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#endif
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std::string result(get_catalog_name_inst());
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return result;
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}
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#ifdef BOOST_HAS_THREADS
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template <class charT>
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static_mutex& cpp_regex_traits<charT>::get_mutex_inst()
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{
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static static_mutex s_mutex = BOOST_STATIC_MUTEX_INIT;
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return s_mutex;
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}
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#endif
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} // boost
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#endif
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