selector.h

// Copyright 2017 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once

#include <stdint.h>
#include <string>

namespace selector_detail {

bool RuleMatches(const std::string& selector, const std::string& token);

template <class TSel, class TTag>
bool SelectorMatches(TSel selbeg, TSel selend, TTag tagbeg, TTag tagend) {
  if (selbeg == selend) return true;
  if (tagbeg == tagend) return false;
  if (!RuleMatches(*--selend, *--tagend)) {
    ++selend;
  }
  return SelectorMatches(selbeg, selend, tagbeg, tagend);
}
}  // namespace selector_detail

template <class TSel, class TTag>
bool SelectorMatches(const TSel& selector, const TTag& tag) {
  return selector_detail::SelectorMatches(selector.begin(), selector.end(),
                                          tag.begin(), tag.end());
}