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129 lines
3.6 KiB
C++
129 lines
3.6 KiB
C++
// Boost token_iterator.hpp -------------------------------------------------//
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// Copyright John R. Bandela 2001
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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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// See http://www.boost.org/libs/tokenizer for documentation.
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// Revision History:
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// 16 Jul 2003 John Bandela
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// Allowed conversions from convertible base iterators
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// 03 Jul 2003 John Bandela
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// Converted to new iterator adapter
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#ifndef BOOST_TOKENIZER_POLICY_JRB070303_HPP_
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#define BOOST_TOKENIZER_POLICY_JRB070303_HPP_
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#include<boost/assert.hpp>
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#include<boost/iterator/iterator_adaptor.hpp>
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#include<boost/iterator/detail/minimum_category.hpp>
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#include<boost/token_functions.hpp>
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#include<utility>
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namespace boost
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{
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template <class TokenizerFunc, class Iterator, class Type>
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class token_iterator
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: public iterator_facade<
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token_iterator<TokenizerFunc, Iterator, Type>
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, Type
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, typename detail::minimum_category<
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forward_traversal_tag
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, typename iterator_traversal<Iterator>::type
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>::type
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, const Type&
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>
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{
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friend class iterator_core_access;
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TokenizerFunc f_;
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Iterator begin_;
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Iterator end_;
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bool valid_;
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Type tok_;
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void increment(){
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BOOST_ASSERT(valid_);
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valid_ = f_(begin_,end_,tok_);
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}
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const Type& dereference() const {
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BOOST_ASSERT(valid_);
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return tok_;
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}
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template<class Other>
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bool equal(const Other& a) const{
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return (a.valid_ && valid_)
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?( (a.begin_==begin_) && (a.end_ == end_) )
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:(a.valid_==valid_);
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}
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void initialize(){
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if(valid_) return;
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f_.reset();
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valid_ = (begin_ != end_)?
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f_(begin_,end_,tok_):false;
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}
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public:
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token_iterator():begin_(),end_(),valid_(false),tok_() { }
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token_iterator(TokenizerFunc f, Iterator begin, Iterator e = Iterator())
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: f_(f),begin_(begin),end_(e),valid_(false),tok_(){ initialize(); }
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token_iterator(Iterator begin, Iterator e = Iterator())
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: f_(),begin_(begin),end_(e),valid_(false),tok_() {initialize();}
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template<class OtherIter>
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token_iterator(
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token_iterator<TokenizerFunc, OtherIter,Type> const& t
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, typename enable_if_convertible<OtherIter, Iterator>::type* = 0)
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: f_(t.tokenizer_function()),begin_(t.base())
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,end_(t.end()),valid_(!t.at_end()),tok_(t.current_token()) {}
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Iterator base()const{return begin_;}
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Iterator end()const{return end_;}
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TokenizerFunc tokenizer_function()const{return f_;}
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Type current_token()const{return tok_;}
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bool at_end()const{return !valid_;}
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};
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template <
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class TokenizerFunc = char_delimiters_separator<char>,
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class Iterator = std::string::const_iterator,
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class Type = std::string
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>
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class token_iterator_generator {
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private:
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public:
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typedef token_iterator<TokenizerFunc,Iterator,Type> type;
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};
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// Type has to be first because it needs to be explicitly specified
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// because there is no way the function can deduce it.
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template<class Type, class Iterator, class TokenizerFunc>
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typename token_iterator_generator<TokenizerFunc,Iterator,Type>::type
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make_token_iterator(Iterator begin, Iterator end,const TokenizerFunc& fun){
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typedef typename
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token_iterator_generator<TokenizerFunc,Iterator,Type>::type ret_type;
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return ret_type(fun,begin,end);
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}
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} // namespace boost
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#endif
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