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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2013-2017 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx library is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
*
* You should have received copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*
* @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
*/
#ifndef NDN_UTIL_REGEX_REGEX_COMPONENT_MATCHER_HPP
#define NDN_UTIL_REGEX_REGEX_COMPONENT_MATCHER_HPP
#include "regex-matcher.hpp"
#include "regex-pseudo-matcher.hpp"
#include <boost/regex.hpp>
namespace ndn {
class RegexComponentMatcher : public RegexMatcher
{
public:
/**
* @brief Create a RegexComponent matcher from expr
* @param expr The standard regular expression to match a component
* @param backrefManager The back reference manager
* @param isExactMatch The flag to provide exact match
*/
RegexComponentMatcher(const std::string& expr,
shared_ptr<RegexBackrefManager> backrefManager,
bool isExactMatch = true);
bool
match(const Name& name, size_t offset, size_t len = 1) override;
protected:
void
compile() override;
private:
bool m_isExactMatch;
boost::regex m_componentRegex;
std::vector<shared_ptr<RegexPseudoMatcher>> m_pseudoMatchers;
};
inline
RegexComponentMatcher::RegexComponentMatcher(const std::string& expr,
shared_ptr<RegexBackrefManager> backrefManager,
bool isExactMatch)
: RegexMatcher(expr, EXPR_COMPONENT, std::move(backrefManager))
, m_isExactMatch(isExactMatch)
{
compile();
}
// Re: http://www.boost.org/users/history/version_1_56_0.html
//
// Breaking change: corrected behavior of basic_regex<>::mark_count() to match existing
// documentation, basic_regex<>::subexpression(n) changed to match, see
// https://svn.boost.org/trac/boost/ticket/9227
//
static constexpr size_t BOOST_REGEXP_MARK_COUNT_CORRECTION =
#if BOOST_VERSION < 105600
1;
#else
0;
#endif
inline void
RegexComponentMatcher::compile()
{
m_componentRegex = boost::regex(m_expr);
m_pseudoMatchers.clear();
m_pseudoMatchers.push_back(make_shared<RegexPseudoMatcher>());
for (size_t i = 1; i <= m_componentRegex.mark_count() - BOOST_REGEXP_MARK_COUNT_CORRECTION; i++) {
m_pseudoMatchers.push_back(make_shared<RegexPseudoMatcher>());
m_backrefManager->pushRef(m_pseudoMatchers.back());
}
}
inline bool
RegexComponentMatcher::match(const Name& name, size_t offset, size_t len)
{
m_matchResult.clear();
if (m_expr.empty()) {
m_matchResult.push_back(name.get(offset));
return true;
}
if (!m_isExactMatch)
BOOST_THROW_EXCEPTION(Error("Non-exact component search is not supported yet"));
boost::smatch subResult;
std::string targetStr = name.get(offset).toUri();
if (boost::regex_match(targetStr, subResult, m_componentRegex)) {
for (size_t i = 1; i <= m_componentRegex.mark_count() - BOOST_REGEXP_MARK_COUNT_CORRECTION; i++) {
m_pseudoMatchers[i]->resetMatchResult();
m_pseudoMatchers[i]->setMatchResult(subResult[i]);
}
m_matchResult.push_back(name.get(offset));
return true;
}
return false;
}
} // namespace ndn
#endif // NDN_UTIL_REGEX_REGEX_COMPONENT_MATCHER_HPP