chromium/base/test/metrics/histogram_enum_reader.cc

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/test/metrics/histogram_enum_reader.h"

#include <optional>

#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "base/strings/string_number_conversions.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/libxml/chromium/xml_reader.h"

namespace base {
namespace {

// This is a helper function to the ReadEnumFromHistogramsXml().
// Extracts single enum (with integer values) from histograms.xml.
// Expects |reader| to point at given enum.
// Returns map { value => label } on success, and nullopt on failure.
std::optional<HistogramEnumEntryMap> ParseEnumFromHistogramsXml(
    const std::string& enum_name,
    XmlReader* reader) { … }

}  // namespace

std::optional<HistogramEnumEntryMap> ReadEnumFromEnumsXml(
    const std::string& enum_name,
    const std::optional<std::string>& subdirectory) { … }

}  // namespace base