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261 lines
8.9 KiB
C++
261 lines
8.9 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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/// \file regex_iterator.hpp
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/// Contains the definition of the regex_iterator type, an STL-compatible iterator
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/// for stepping through all the matches in a sequence.
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// 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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#ifndef BOOST_XPRESSIVE_REGEX_ITERATOR_HPP_EAN_10_04_2005
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#define BOOST_XPRESSIVE_REGEX_ITERATOR_HPP_EAN_10_04_2005
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/noncopyable.hpp>
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#include <boost/intrusive_ptr.hpp>
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#include <boost/iterator/iterator_traits.hpp>
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#include <boost/xpressive/detail/detail_fwd.hpp>
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#include <boost/xpressive/detail/core/access.hpp>
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#include <boost/xpressive/detail/utility/counted_base.hpp>
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namespace boost { namespace xpressive { namespace detail
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{
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//////////////////////////////////////////////////////////////////////////
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// regex_iterator_impl
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//
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template<typename BidiIter>
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struct regex_iterator_impl
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: counted_base<regex_iterator_impl<BidiIter> >
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{
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typedef detail::core_access<BidiIter> access;
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regex_iterator_impl
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(
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BidiIter begin
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, BidiIter cur
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, BidiIter end
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, BidiIter next_search
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, basic_regex<BidiIter> const &rex
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, regex_constants::match_flag_type flags
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, bool not_null = false
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)
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: rex_(rex)
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, what_()
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, state_(begin, end, what_, *access::get_regex_impl(rex_), flags)
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, flags_(flags)
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, not_null_(not_null)
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{
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this->state_.cur_ = cur;
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this->state_.next_search_ = next_search;
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}
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bool next()
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{
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this->state_.reset(this->what_, *access::get_regex_impl(this->rex_));
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if(!regex_search_impl(this->state_, this->rex_, this->not_null_))
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{
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return false;
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}
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// Report position() correctly by setting the base different from prefix().first
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access::set_base(this->what_, this->state_.begin_);
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this->state_.cur_ = this->state_.next_search_ = this->what_[0].second;
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this->not_null_ = (0 == this->what_.length());
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return true;
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}
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bool equal_to(regex_iterator_impl<BidiIter> const &that) const
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{
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return this->rex_.regex_id() == that.rex_.regex_id()
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&& this->state_.begin_ == that.state_.begin_
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&& this->state_.cur_ == that.state_.cur_
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&& this->state_.end_ == that.state_.end_
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&& this->flags_ == that.flags_
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;
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}
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basic_regex<BidiIter> rex_;
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match_results<BidiIter> what_;
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match_state<BidiIter> state_;
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regex_constants::match_flag_type const flags_;
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bool not_null_;
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};
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} // namespace detail
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//////////////////////////////////////////////////////////////////////////
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// regex_iterator
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//
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template<typename BidiIter>
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struct regex_iterator
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{
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typedef basic_regex<BidiIter> regex_type;
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typedef match_results<BidiIter> value_type;
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typedef typename iterator_difference<BidiIter>::type difference_type;
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typedef value_type const *pointer;
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typedef value_type const &reference;
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typedef std::forward_iterator_tag iterator_category;
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/// INTERNAL ONLY
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typedef detail::regex_iterator_impl<BidiIter> impl_type_;
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regex_iterator()
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: impl_()
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{
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}
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regex_iterator
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(
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BidiIter begin
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, BidiIter end
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, basic_regex<BidiIter> const &rex
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, regex_constants::match_flag_type flags = regex_constants::match_default
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)
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: impl_()
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{
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if(0 != rex.regex_id()) // Empty regexes are guaranteed to match nothing
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{
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this->impl_ = new impl_type_(begin, begin, end, begin, rex, flags);
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this->next_();
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}
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}
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template<typename LetExpr>
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regex_iterator
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(
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BidiIter begin
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, BidiIter end
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, basic_regex<BidiIter> const &rex
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, detail::let_<LetExpr> const &args
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, regex_constants::match_flag_type flags = regex_constants::match_default
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)
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: impl_()
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{
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if(0 != rex.regex_id()) // Empty regexes are guaranteed to match nothing
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{
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this->impl_ = new impl_type_(begin, begin, end, begin, rex, flags);
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detail::bind_args(args, this->impl_->what_);
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this->next_();
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}
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}
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regex_iterator(regex_iterator<BidiIter> const &that)
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: impl_(that.impl_) // COW
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{
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}
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regex_iterator<BidiIter> &operator =(regex_iterator<BidiIter> const &that)
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{
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this->impl_ = that.impl_; // COW
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return *this;
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}
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friend bool operator ==(regex_iterator<BidiIter> const &left, regex_iterator<BidiIter> const &right)
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{
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if(!left.impl_ || !right.impl_)
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{
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return !left.impl_ && !right.impl_;
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}
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return left.impl_->equal_to(*right.impl_);
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}
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friend bool operator !=(regex_iterator<BidiIter> const &left, regex_iterator<BidiIter> const &right)
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{
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return !(left == right);
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}
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value_type const &operator *() const
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{
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return this->impl_->what_;
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}
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value_type const *operator ->() const
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{
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return &this->impl_->what_;
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}
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/// If what.prefix().first != what[0].second and if the element match_prev_avail is not set in
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/// flags then sets it. Then behaves as if by calling regex_search(what[0].second, end, what, *pre, flags),
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/// with the following variation: in the event that the previous match found was of zero length
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/// (what[0].length() == 0) then attempts to find a non-zero length match starting at what[0].second,
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/// only if that fails and provided what[0].second != suffix().second does it look for a (possibly
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/// zero length) match starting from what[0].second + 1. If no further match is found then sets
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/// *this equal to the end of sequence iterator.
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/// \post (*this)-\>size() == pre-\>mark_count() + 1
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/// \post (*this)-\>empty() == false
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/// \post (*this)-\>prefix().first == An iterator denoting the end point of the previous match found
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/// \post (*this)-\>prefix().last == (**this)[0].first
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/// \post (*this)-\>prefix().matched == (*this)-\>prefix().first != (*this)-\>prefix().second
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/// \post (*this)-\>suffix().first == (**this)[0].second
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/// \post (*this)-\>suffix().last == end
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/// \post (*this)-\>suffix().matched == (*this)-\>suffix().first != (*this)-\>suffix().second
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/// \post (**this)[0].first == The starting iterator for this match.
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/// \post (**this)[0].second == The ending iterator for this match.
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/// \post (**this)[0].matched == true if a full match was found, and false if it was a partial match (found as a result of the match_partial flag being set).
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/// \post (**this)[n].first == For all integers n \< (*this)-\>size(), the start of the sequence that matched sub-expression n. Alternatively, if sub-expression n did not participate in the match, then end.
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/// \post (**this)[n].second == For all integers n \< (*this)-\>size(), the end of the sequence that matched sub-expression n. Alternatively, if sub-expression n did not participate in the match, then end.
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/// \post (**this)[n].matched == For all integers n \< (*this)-\>size(), true if sub-expression n participated in the match, false otherwise.
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/// \post (*this)-\>position() == The distance from the start of the original sequence being iterated, to the start of this match.
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regex_iterator<BidiIter> &operator ++()
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{
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this->fork_(); // un-share the implementation
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this->next_();
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return *this;
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}
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regex_iterator<BidiIter> operator ++(int)
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{
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regex_iterator<BidiIter> tmp(*this);
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++*this;
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return tmp;
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}
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private:
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/// INTERNAL ONLY
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void fork_()
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{
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if(1 != this->impl_->use_count())
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{
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// This is OK, the use_count is > 1
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impl_type_ *that = this->impl_.get();
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this->impl_ = new impl_type_
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(
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that->state_.begin_
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, that->state_.cur_
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, that->state_.end_
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, that->state_.next_search_
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, that->rex_
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, that->flags_
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, that->not_null_
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);
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detail::core_access<BidiIter>::get_action_args(this->impl_->what_)
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= detail::core_access<BidiIter>::get_action_args(that->what_);
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}
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}
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/// INTERNAL ONLY
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void next_()
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{
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BOOST_ASSERT(this->impl_ && 1 == this->impl_->use_count());
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if(!this->impl_->next())
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{
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this->impl_ = 0;
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}
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}
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intrusive_ptr<impl_type_> impl_;
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};
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}} // namespace boost::xpressive
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#endif
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