313 lines
12 KiB
C++
313 lines
12 KiB
C++
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// Boost string_algo library classification.hpp header file ---------------------------//
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// Copyright Pavol Droba 2002-2003.
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See 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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// See http://www.boost.org/ for updates, documentation, and revision history.
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#ifndef BOOST_STRING_CLASSIFICATION_HPP
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#define BOOST_STRING_CLASSIFICATION_HPP
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#include <algorithm>
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#include <locale>
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#include <boost/range/value_type.hpp>
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#include <boost/range/as_literal.hpp>
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#include <boost/algorithm/string/detail/classification.hpp>
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#include <boost/algorithm/string/predicate_facade.hpp>
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/*! \file
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Classification predicates are included in the library to give
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some more convenience when using algorithms like \c trim() and \c all().
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They wrap functionality of STL classification functions ( e.g. \c std::isspace() )
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into generic functors.
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*/
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namespace boost {
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namespace algorithm {
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// classification functor generator -------------------------------------//
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//! is_classified predicate
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/*!
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Construct the \c is_classified predicate. This predicate holds if the input is
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of specified \c std::ctype category.
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\param Type A \c std::ctype category
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\param Loc A locale used for classification
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\return An instance of the \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_classified(std::ctype_base::mask Type, const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(Type, Loc);
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}
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//! is_space predicate
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/*!
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Construct the \c is_classified predicate for the \c ctype_base::space category.
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\param Loc A locale used for classification
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\return An instance of the \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_space(const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(std::ctype_base::space, Loc);
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}
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//! is_alnum predicate
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/*!
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Construct the \c is_classified predicate for the \c ctype_base::alnum category.
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\param Loc A locale used for classification
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\return An instance of the \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_alnum(const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(std::ctype_base::alnum, Loc);
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}
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//! is_alpha predicate
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/*!
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Construct the \c is_classified predicate for the \c ctype_base::alpha category.
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\param Loc A locale used for classification
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\return An instance of the \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_alpha(const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(std::ctype_base::alpha, Loc);
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}
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//! is_cntrl predicate
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/*!
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Construct the \c is_classified predicate for the \c ctype_base::cntrl category.
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\param Loc A locale used for classification
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\return An instance of the \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_cntrl(const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(std::ctype_base::cntrl, Loc);
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}
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//! is_digit predicate
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/*!
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Construct the \c is_classified predicate for the \c ctype_base::digit category.
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\param Loc A locale used for classification
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\return An instance of the \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_digit(const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(std::ctype_base::digit, Loc);
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}
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//! is_graph predicate
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/*!
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Construct the \c is_classified predicate for the \c ctype_base::graph category.
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\param Loc A locale used for classification
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\return An instance of the \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_graph(const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(std::ctype_base::graph, Loc);
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}
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//! is_lower predicate
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/*!
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Construct the \c is_classified predicate for the \c ctype_base::lower category.
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\param Loc A locale used for classification
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\return An instance of \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_lower(const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(std::ctype_base::lower, Loc);
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}
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//! is_print predicate
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/*!
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Construct the \c is_classified predicate for the \c ctype_base::print category.
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\param Loc A locale used for classification
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\return An instance of the \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_print(const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(std::ctype_base::print, Loc);
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}
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//! is_punct predicate
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/*!
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Construct the \c is_classified predicate for the \c ctype_base::punct category.
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\param Loc A locale used for classification
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\return An instance of the \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_punct(const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(std::ctype_base::punct, Loc);
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}
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//! is_upper predicate
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/*!
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Construct the \c is_classified predicate for the \c ctype_base::upper category.
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\param Loc A locale used for classification
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\return An instance of the \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_upper(const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(std::ctype_base::upper, Loc);
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}
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//! is_xdigit predicate
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/*!
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Construct the \c is_classified predicate for the \c ctype_base::xdigit category.
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\param Loc A locale used for classification
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\return An instance of the \c is_classified predicate
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*/
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inline detail::is_classifiedF
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is_xdigit(const std::locale& Loc=std::locale())
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{
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return detail::is_classifiedF(std::ctype_base::xdigit, Loc);
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}
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//! is_any_of predicate
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/*!
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Construct the \c is_any_of predicate. The predicate holds if the input
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is included in the specified set of characters.
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\param Set A set of characters to be recognized
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\return An instance of the \c is_any_of predicate
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*/
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template<typename RangeT>
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inline detail::is_any_ofF<
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BOOST_STRING_TYPENAME range_value<RangeT>::type>
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is_any_of( const RangeT& Set )
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{
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iterator_range<BOOST_STRING_TYPENAME range_const_iterator<RangeT>::type> lit_set(boost::as_literal(Set));
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return detail::is_any_ofF<BOOST_STRING_TYPENAME range_value<RangeT>::type>(lit_set);
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}
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//! is_from_range predicate
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/*!
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Construct the \c is_from_range predicate. The predicate holds if the input
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is included in the specified range. (i.e. From <= Ch <= To )
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\param From The start of the range
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\param To The end of the range
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\return An instance of the \c is_from_range predicate
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*/
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template<typename CharT>
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inline detail::is_from_rangeF<CharT> is_from_range(CharT From, CharT To)
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{
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return detail::is_from_rangeF<CharT>(From,To);
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}
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// predicate combinators ---------------------------------------------------//
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//! predicate 'and' composition predicate
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/*!
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Construct the \c class_and predicate. This predicate can be used
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to logically combine two classification predicates. \c class_and holds,
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if both predicates return true.
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\param Pred1 The first predicate
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\param Pred2 The second predicate
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\return An instance of the \c class_and predicate
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*/
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template<typename Pred1T, typename Pred2T>
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inline detail::pred_andF<Pred1T, Pred2T>
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operator&&(
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const predicate_facade<Pred1T>& Pred1,
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const predicate_facade<Pred2T>& Pred2 )
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{
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// Doing the static_cast with the pointer instead of the reference
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// is a workaround for some compilers which have problems with
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// static_cast's of template references, i.e. CW8. /grafik/
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return detail::pred_andF<Pred1T,Pred2T>(
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*static_cast<const Pred1T*>(&Pred1),
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*static_cast<const Pred2T*>(&Pred2) );
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}
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//! predicate 'or' composition predicate
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/*!
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Construct the \c class_or predicate. This predicate can be used
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to logically combine two classification predicates. \c class_or holds,
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if one of the predicates return true.
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\param Pred1 The first predicate
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\param Pred2 The second predicate
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\return An instance of the \c class_or predicate
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*/
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template<typename Pred1T, typename Pred2T>
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inline detail::pred_orF<Pred1T, Pred2T>
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operator||(
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const predicate_facade<Pred1T>& Pred1,
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const predicate_facade<Pred2T>& Pred2 )
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{
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// Doing the static_cast with the pointer instead of the reference
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// is a workaround for some compilers which have problems with
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// static_cast's of template references, i.e. CW8. /grafik/
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return detail::pred_orF<Pred1T,Pred2T>(
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*static_cast<const Pred1T*>(&Pred1),
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*static_cast<const Pred2T*>(&Pred2));
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}
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//! predicate negation operator
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/*!
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Construct the \c class_not predicate. This predicate represents a negation.
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\c class_or holds if of the predicates return false.
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\param Pred The predicate to be negated
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\return An instance of the \c class_not predicate
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*/
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template<typename PredT>
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inline detail::pred_notF<PredT>
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operator!( const predicate_facade<PredT>& Pred )
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{
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// Doing the static_cast with the pointer instead of the reference
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// is a workaround for some compilers which have problems with
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// static_cast's of template references, i.e. CW8. /grafik/
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return detail::pred_notF<PredT>(*static_cast<const PredT*>(&Pred));
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}
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} // namespace algorithm
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// pull names to the boost namespace
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using algorithm::is_classified;
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using algorithm::is_space;
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using algorithm::is_alnum;
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using algorithm::is_alpha;
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using algorithm::is_cntrl;
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using algorithm::is_digit;
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using algorithm::is_graph;
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using algorithm::is_lower;
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using algorithm::is_upper;
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using algorithm::is_print;
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using algorithm::is_punct;
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using algorithm::is_xdigit;
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using algorithm::is_any_of;
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using algorithm::is_from_range;
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} // namespace boost
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#endif // BOOST_STRING_PREDICATE_HPP
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