regex-backref-matcher.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013-2021 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/>
 */
 
#include "ndn-cxx/util/regex/regex-backref-matcher.hpp"
#include "ndn-cxx/util/regex/regex-pattern-list-matcher.hpp"
 
namespace ndn {
 
RegexBackrefMatcher::RegexBackrefMatcher(const std::string& expr,
                                         shared_ptr<RegexBackrefManager> backrefManager)
  : RegexMatcher(expr, EXPR_BACKREF, std::move(backrefManager))
{
}
 
void
RegexBackrefMatcher::compile()
{
  if (m_expr.size() < 2) {
    NDN_THROW(Error("Invalid capture group syntax: " + m_expr));
  }
 
  size_t lastIndex = m_expr.size() - 1;
  if ('(' == m_expr[0] && ')' == m_expr[lastIndex]) {
    m_matchers.push_back(make_shared<RegexPatternListMatcher>(m_expr.substr(1, lastIndex - 1),
                                                              m_backrefManager));
  }
  else {
    NDN_THROW(Error("Invalid capture group syntax: " + m_expr));
  }
}
 
} // namespace ndn