common/strings/range.h

// Copyright 2017-2020 The Verible Authors.
//
// 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
//
//      http://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.

#ifndef VERIBLE_COMMON_STRINGS_RANGE_H_
#define VERIBLE_COMMON_STRINGS_RANGE_H_

#include <utility>

#include "absl/strings/string_view.h"

namespace verible {

// Construct a string_view from two end-points.
// string_view lacks the two-iterator constructor that (iterator) ranges and
// containers do.
// This exploits the fact that string_view's iterators are just const char*.
absl::string_view make_string_view_range(const char* begin, const char* end);

// Returns [x,y] where superstring.substr(x, y-x) == substring.
// Precondition: substring must be a sub-range of superstring.
std::pair<int, int> SubstringOffsets(absl::string_view substring,
                                     absl::string_view superstring);

}  // namespace verible

#endif  // VERIBLE_COMMON_STRINGS_RANGE_H_