src/developer/debug/shared/regex.h

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#pragma once

#include <regex.h>

#include <optional>
#include <string>

#include "src/lib/fxl/macros.h"

namespace debug_ipc {

// Simple RAII class wrapper over the POSIX regex API.
// Currently it only looks for normal matches, but can be extended to support
// capturing and other neat regex stuff.
class Regex {
 public:
  enum class CompareType {
    kCaseSensitive,
    kCaseInsensitive,
  };

  Regex();
  ~Regex();
  FXL_DISALLOW_COPY_AND_ASSIGN(Regex);

  // We need to define moving because optional doesn't clears the value on move,
  // which would double free the regex_t.
  Regex(Regex&&);
  Regex& operator=(Regex&&);

  bool valid() const { return handle_.has_value(); }

  bool Init(const std::string& regexp,
            CompareType = CompareType::kCaseInsensitive);
  bool Match(const std::string&) const;

 private:
  // Optional so we can mark when a regex is not compiled.
  std::optional<regex_t> handle_ = std::nullopt;
};

}  // namespace debug_ipc