1 // Copyright 2018 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_TEST_METRICS_HISTOGRAM_ENUM_READER_H_ 6 #define BASE_TEST_METRICS_HISTOGRAM_ENUM_READER_H_ 7 8 #include <map> 9 #include <string> 10 11 #include "base/metrics/histogram_base.h" 12 #include "base/optional.h" 13 14 namespace base { 15 16 using HistogramEnumEntryMap = std::map<HistogramBase::Sample, std::string>; 17 18 // Find and read the enum with the given |enum_name| (with integer values) from 19 // tools/metrics/histograms/enums.xml. 20 // 21 // Returns map { value => label } so that: 22 // <int value="9" label="enable-pinch-virtual-viewport"/> 23 // becomes: 24 // { 9 => "enable-pinch-virtual-viewport" } 25 // Returns empty base::nullopt on failure. 26 base::Optional<HistogramEnumEntryMap> ReadEnumFromEnumsXml( 27 const std::string& enum_name); 28 29 } // namespace base 30 31 #endif // BASE_TEST_METRICS_HISTOGRAM_ENUM_READER_H_ 32