blob: 118167f6282447a512fb31896c8278a0e5bf82ea [file] [log] [blame]
// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:convert';
import 'dart:io';
import 'common.dart';
import 'constants.dart';
const String _kTimeUnitKey = 'time_unit';
const List<String> _kNonNumericalValueSubResults = <String>[
kNameKey,
_kTimeUnitKey,
'iterations',
'big_o',
];
// ignore: avoid_classes_with_only_static_members
/// Parse the json result of https://github.com/google/benchmark.
class GoogleBenchmarkParser {
/// Given a Google benchmark json output, parse its content into a list of [MetricPoint].
static Future<List<MetricPoint>> parse(String jsonFileName) async {
final Map<String, dynamic> jsonResult =
jsonDecode(File(jsonFileName).readAsStringSync())
as Map<String, dynamic>;
final Map<String, dynamic> rawContext =
jsonResult['context'] as Map<String, dynamic>;
final Map<String, String> context = rawContext.map<String, String>(
(String k, dynamic v) => MapEntry<String, String>(k, v.toString()),
);
final List<MetricPoint> points = <MetricPoint>[];
for (final dynamic item in jsonResult['benchmarks']) {
_parseAnItem(item as Map<String, dynamic>, points, context);
}
return points;
}
}
void _parseAnItem(
Map<String, dynamic> item,
List<MetricPoint> points,
Map<String, String> context,
) {
final String name = item[kNameKey] as String;
final Map<String, String> timeUnitMap = <String, String>{
kUnitKey: item[_kTimeUnitKey] as String
};
for (final String subResult in item.keys) {
if (!_kNonNumericalValueSubResults.contains(subResult)) {
num rawValue;
try {
rawValue = item[subResult] as num;
} catch (e) {
print(
'$subResult: ${item[subResult]} (${item[subResult].runtimeType}) is not a number');
rethrow;
}
final double value =
rawValue is int ? rawValue.toDouble() : rawValue as double;
points.add(
MetricPoint(
value,
<String, String>{kNameKey: name, kSubResultKey: subResult}
..addAll(context)
..addAll(
subResult.endsWith('time') ? timeUnitMap : <String, String>{}),
),
);
}
}
}