pkg/analysis_server/tool/code_completion/flutter_metrics.dart - sdk.git - Git at Google

 // Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
 // for details. 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:io' as io;

 import 'package:analysis_server/src/utilities/flutter.dart';
 import 'package:analyzer/dart/analysis/analysis_context_collection.dart';
 import 'package:analyzer/dart/analysis/context_root.dart';
 import 'package:analyzer/dart/analysis/results.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/diagnostic/diagnostic.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/src/util/file_paths.dart' as file_paths;
 import 'package:args/args.dart';

 /// Compute and print information about flutter packages.
 Future<void> main(List<String> args) async {
   var parser = createArgParser();
   var result = parser.parse(args);

   if (validArguments(parser, result)) {
     var out = io.stdout;
     var rootPath = result.rest[0];
     out.writeln('Analyzing root: "$rootPath"');

     var computer = FlutterMetricsComputer();
     var stopwatch = Stopwatch()..start();
     await computer.compute(rootPath);
     stopwatch.stop();
     var duration = Duration(milliseconds: stopwatch.elapsedMilliseconds);
     out.writeln('');
     out.writeln('Analysis performed in $duration');
     computer.writeResults(out);
     await out.flush();
   }
   io.exit(0);
 }

 /// Create a parser that can be used to parse the command-line arguments.
 ArgParser createArgParser() {
   var parser = ArgParser();
   parser.addOption(
     'help',
     abbr: 'h',
     help: 'Print this help message.',
   );
   return parser;
 }

 /// Print usage information for this tool.
 void printUsage(ArgParser parser, {String error}) {
   if (error != null) {
     print(error);
     print('');
   }
   print('usage: dart flutter_metrics.dart [options] packagePath');
   print('');
   print('Compute and print information about flutter packages.');
   print('');
   print(parser.usage);
 }

 /// Return `true` if the command-line arguments (represented by the [result] and
 /// parsed by the [parser]) are valid.
 bool validArguments(ArgParser parser, ArgResults result) {
   if (result.wasParsed('help')) {
     printUsage(parser);
     return false;
   } else if (result.rest.length != 1) {
     printUsage(parser, error: 'No directory path specified.');
     return false;
   }
   var rootPath = result.rest[0];
   if (!io.Directory(rootPath).existsSync()) {
     printUsage(parser, error: 'The directory "$rootPath" does not exist.');
     return false;
   }
   return true;
 }

 /// An object that records the data as it is being computed.
 class FlutterData {
   /// The total number of widget creation expressions found.
   int totalWidgetCount = 0;

   /// A table mapping the name of a widget class to the number of times in
   /// which an instance of that class is created.
   Map<String, int> widgetCounts = {};

   /// A table mapping the name of a widget class and the name of the parent
   /// widget to the number of times the widget was created as a child of the
   /// parent.
   Map<String, Map<String, int>> parentData = {};

   /// A table mapping the name of the parent widget and the name of a widget
   /// class to the number of times the parent had a widget of the given kind.
   Map<String, Map<String, int>> childData = {};

   /// Initialize a newly created set of data to be empty.
   FlutterData();

   /// Record that an instance of the [childWidget] was created. If the instance
   /// creation expression is an argument in another widget constructor
   /// invocation, then the [parentWidget] is the name of the enclosing class.
   void recordWidgetCreation(String childWidget, String parentWidget) {
     totalWidgetCount++;
     widgetCounts[childWidget] = (widgetCounts[childWidget] ?? 0) + 1;

     if (parentWidget != null) {
       var parentMap = parentData.putIfAbsent(childWidget, () => {});
       parentMap[parentWidget] = (parentMap[parentWidget] ?? 0) + 1;

       var childMap = childData.putIfAbsent(parentWidget, () => {});
       childMap[childWidget] = (childMap[childWidget] ?? 0) + 1;
     }
   }
 }

 /// An object that visits a compilation unit in order to record the data being
 /// collected.
 class FlutterDataCollector extends RecursiveAstVisitor<void> {
   /// The data being collected.
   final FlutterData data;

   /// The object used to determine Flutter-specific features.
   Flutter flutter;

   /// The name of the most deeply widget class whose constructor invocation we
   /// are within.
   String parentWidget;

   /// Initialize a newly created collector to add data points to the given
   /// [data].
   FlutterDataCollector(this.data);

   @override
   void visitInstanceCreationExpression(InstanceCreationExpression node) {
     var previousParentWidget = parentWidget;
     if (flutter.isWidgetCreation(node)) {
       var element = node.constructorName.staticElement;
       if (element == null) {
         throw StateError(
             'Unresolved constructor name: ${node.constructorName}');
       }
       var childWidget = element.enclosingElement.name;
       if (!element.librarySource.uri
           .toString()
           .startsWith('package:flutter/')) {
         childWidget = 'user-defined';
       }
       data.recordWidgetCreation(childWidget, parentWidget);
       parentWidget = childWidget;
     }
     super.visitInstanceCreationExpression(node);
     parentWidget = previousParentWidget;
   }
 }

 /// An object used to compute metrics for a single file or directory.
 class FlutterMetricsComputer {
   /// The resource provider used to access the files being analyzed.
   final PhysicalResourceProvider resourceProvider =
       PhysicalResourceProvider.INSTANCE;

   /// The data that was computed.
   final FlutterData data = FlutterData();

   /// Initialize a newly created metrics computer that can compute the metrics
   /// in one or more files and directories.
   FlutterMetricsComputer();

   /// Compute the metrics for the file(s) in the [rootPath].
   Future<void> compute(String rootPath) async {
     final collection = AnalysisContextCollection(
       includedPaths: [rootPath],
       resourceProvider: PhysicalResourceProvider.INSTANCE,
     );
     final collector = FlutterDataCollector(data);
     for (var context in collection.contexts) {
       await _computeInContext(context.contextRoot, collector);
     }
   }

   /// Write a report of the metrics that were computed to the [sink].
   void writeResults(StringSink sink) {
     _writeWidgetCounts(sink);
     _writeChildData(sink);
     _writeParentData(sink);
   }

   /// Compute the metrics for the files in the context [root], creating a
   /// separate context collection to prevent accumulating memory. The metrics
   /// should be captured in the [collector].
   Future<void> _computeInContext(
       ContextRoot root, FlutterDataCollector collector) async {
     // Create a new collection to avoid consuming large quantities of memory.
     final collection = AnalysisContextCollection(
       includedPaths: root.includedPaths.toList(),
       excludedPaths: root.excludedPaths.toList(),
       resourceProvider: PhysicalResourceProvider.INSTANCE,
     );
     var context = collection.contexts[0];
     var pathContext = context.contextRoot.resourceProvider.pathContext;
     for (var filePath in context.contextRoot.analyzedFiles()) {
       if (file_paths.isDart(pathContext, filePath)) {
         try {
           var resolvedUnitResult =
               await context.currentSession.getResolvedUnit(filePath);
           //
           // Check for errors that cause the file to be skipped.
           //
           if (resolvedUnitResult == null) {
             print('');
             print('File $filePath skipped because of an internal error.');
             continue;
           } else if (resolvedUnitResult.state != ResultState.VALID) {
             print('');
             print('File $filePath skipped because it could not be analyzed.');
             continue;
           } else if (hasError(resolvedUnitResult)) {
             print('');
             print('File $filePath skipped due to errors:');
             for (var error in resolvedUnitResult.errors) {
               print('  ${error.toString()}');
             }
             continue;
           }

           collector.flutter = Flutter.instance;
           resolvedUnitResult.unit.accept(collector);
         } catch (exception, stackTrace) {
           print('');
           print('Exception caught analyzing: "$filePath"');
           print(exception);
           print(stackTrace);
         }
       }
     }
   }

   /// Compute and format a percentage for the fraction [value] / [total].
   String _formatPercent(int value, int total) {
     var percent = ((value / total) * 100).toStringAsFixed(1);
     if (percent.length == 3) {
       percent = '  $percent';
     } else if (percent.length == 4) {
       percent = ' $percent';
     }
     return percent;
   }

   /// Write the child data to the [sink].
   void _writeChildData(StringSink sink) {
     sink.writeln('');
     sink.writeln('The number of times a widget had a given child.');
     _writeStructureData(sink, data.childData);
   }

   /// Write the parent data to the [sink].
   void _writeParentData(StringSink sink) {
     sink.writeln('');
     sink.writeln('The number of times a widget had a given parent.');
     _writeStructureData(sink, data.parentData);
   }

   /// Write the structure data in the [structureMap] to the [sink].
   void _writeStructureData(
       StringSink sink, Map<String, Map<String, int>> structureMap) {
     var outerKeys = structureMap.keys.toList()..sort();
     for (var outerKey in outerKeys) {
       sink.writeln(outerKey);
       var innerMap = structureMap[outerKey];
       var entries = innerMap.entries.toList();
       entries.sort((first, second) => second.value.compareTo(first.value));
       var total = entries.fold(
           0, (previousValue, entry) => previousValue + entry.value);
       for (var entry in entries) {
         var percent = _formatPercent(entry.value, total);
         sink.writeln('  $percent%: ${entry.key} (${entry.value})');
       }
     }
   }

   /// Write the widget count data to the [sink].
   void _writeWidgetCounts(StringSink sink) {
     sink.writeln('');
     sink.writeln('Widget classes by frequency of instantiation');

     var total = data.totalWidgetCount;
     var entries = data.widgetCounts.entries.toList();
     entries.sort((first, second) => second.value.compareTo(first.value));
     for (var entry in entries) {
       var percent = _formatPercent(entry.value, total);
       sink.writeln('  $percent%: ${entry.key} (${entry.value})');
     }
   }

   /// Return `true` if the [result] contains an error.
   static bool hasError(ResolvedUnitResult result) {
     for (var error in result.errors) {
       if (error.severity == Severity.error) {
         return true;
       }
     }
     return false;
   }
 }
	// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
	// for details. 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:io' as io;

	import 'package:analysis_server/src/utilities/flutter.dart';
	import 'package:analyzer/dart/analysis/analysis_context_collection.dart';
	import 'package:analyzer/dart/analysis/context_root.dart';
	import 'package:analyzer/dart/analysis/results.dart';
	import 'package:analyzer/dart/ast/ast.dart';
	import 'package:analyzer/dart/ast/visitor.dart';
	import 'package:analyzer/diagnostic/diagnostic.dart';
	import 'package:analyzer/file_system/physical_file_system.dart';
	import 'package:analyzer/src/util/file_paths.dart' as file_paths;
	import 'package:args/args.dart';

	/// Compute and print information about flutter packages.
	Future<void> main(List<String> args) async {
	var parser = createArgParser();
	var result = parser.parse(args);

	if (validArguments(parser, result)) {
	var out = io.stdout;
	var rootPath = result.rest[0];
	out.writeln('Analyzing root: "$rootPath"');

	var computer = FlutterMetricsComputer();
	var stopwatch = Stopwatch()..start();
	await computer.compute(rootPath);
	stopwatch.stop();
	var duration = Duration(milliseconds: stopwatch.elapsedMilliseconds);
	out.writeln('');
	out.writeln('Analysis performed in $duration');
	computer.writeResults(out);
	await out.flush();
	}
	io.exit(0);
	}

	/// Create a parser that can be used to parse the command-line arguments.
	ArgParser createArgParser() {
	var parser = ArgParser();
	parser.addOption(
	'help',
	abbr: 'h',
	help: 'Print this help message.',
	);
	return parser;
	}

	/// Print usage information for this tool.
	void printUsage(ArgParser parser, {String error}) {
	if (error != null) {
	print(error);
	print('');
	}
	print('usage: dart flutter_metrics.dart [options] packagePath');
	print('');
	print('Compute and print information about flutter packages.');
	print('');
	print(parser.usage);
	}

	/// Return `true` if the command-line arguments (represented by the [result] and
	/// parsed by the [parser]) are valid.
	bool validArguments(ArgParser parser, ArgResults result) {
	if (result.wasParsed('help')) {
	printUsage(parser);
	return false;
	} else if (result.rest.length != 1) {
	printUsage(parser, error: 'No directory path specified.');
	return false;
	}
	var rootPath = result.rest[0];
	if (!io.Directory(rootPath).existsSync()) {
	printUsage(parser, error: 'The directory "$rootPath" does not exist.');
	return false;
	}
	return true;
	}

	/// An object that records the data as it is being computed.
	class FlutterData {
	/// The total number of widget creation expressions found.
	int totalWidgetCount = 0;

	/// A table mapping the name of a widget class to the number of times in
	/// which an instance of that class is created.
	Map<String, int> widgetCounts = {};

	/// A table mapping the name of a widget class and the name of the parent
	/// widget to the number of times the widget was created as a child of the
	/// parent.
	Map<String, Map<String, int>> parentData = {};

	/// A table mapping the name of the parent widget and the name of a widget
	/// class to the number of times the parent had a widget of the given kind.
	Map<String, Map<String, int>> childData = {};

	/// Initialize a newly created set of data to be empty.
	FlutterData();

	/// Record that an instance of the [childWidget] was created. If the instance
	/// creation expression is an argument in another widget constructor
	/// invocation, then the [parentWidget] is the name of the enclosing class.
	void recordWidgetCreation(String childWidget, String parentWidget) {
	totalWidgetCount++;
	widgetCounts[childWidget] = (widgetCounts[childWidget] ?? 0) + 1;

	if (parentWidget != null) {
	var parentMap = parentData.putIfAbsent(childWidget, () => {});
	parentMap[parentWidget] = (parentMap[parentWidget] ?? 0) + 1;

	var childMap = childData.putIfAbsent(parentWidget, () => {});
	childMap[childWidget] = (childMap[childWidget] ?? 0) + 1;
	}
	}
	}

	/// An object that visits a compilation unit in order to record the data being
	/// collected.
	class FlutterDataCollector extends RecursiveAstVisitor<void> {
	/// The data being collected.
	final FlutterData data;

	/// The object used to determine Flutter-specific features.
	Flutter flutter;

	/// The name of the most deeply widget class whose constructor invocation we
	/// are within.
	String parentWidget;

	/// Initialize a newly created collector to add data points to the given
	/// [data].
	FlutterDataCollector(this.data);

	@override
	void visitInstanceCreationExpression(InstanceCreationExpression node) {
	var previousParentWidget = parentWidget;
	if (flutter.isWidgetCreation(node)) {
	var element = node.constructorName.staticElement;
	if (element == null) {
	throw StateError(
	'Unresolved constructor name: ${node.constructorName}');
	}
	var childWidget = element.enclosingElement.name;
	if (!element.librarySource.uri
	.toString()
	.startsWith('package:flutter/')) {
	childWidget = 'user-defined';
	}
	data.recordWidgetCreation(childWidget, parentWidget);
	parentWidget = childWidget;
	}
	super.visitInstanceCreationExpression(node);
	parentWidget = previousParentWidget;
	}
	}

	/// An object used to compute metrics for a single file or directory.
	class FlutterMetricsComputer {
	/// The resource provider used to access the files being analyzed.
	final PhysicalResourceProvider resourceProvider =
	PhysicalResourceProvider.INSTANCE;

	/// The data that was computed.
	final FlutterData data = FlutterData();

	/// Initialize a newly created metrics computer that can compute the metrics
	/// in one or more files and directories.
	FlutterMetricsComputer();

	/// Compute the metrics for the file(s) in the [rootPath].
	Future<void> compute(String rootPath) async {
	final collection = AnalysisContextCollection(
	includedPaths: [rootPath],
	resourceProvider: PhysicalResourceProvider.INSTANCE,
	);
	final collector = FlutterDataCollector(data);
	for (var context in collection.contexts) {
	await _computeInContext(context.contextRoot, collector);
	}
	}

	/// Write a report of the metrics that were computed to the [sink].
	void writeResults(StringSink sink) {
	_writeWidgetCounts(sink);
	_writeChildData(sink);
	_writeParentData(sink);
	}

	/// Compute the metrics for the files in the context [root], creating a
	/// separate context collection to prevent accumulating memory. The metrics
	/// should be captured in the [collector].
	Future<void> _computeInContext(
	ContextRoot root, FlutterDataCollector collector) async {
	// Create a new collection to avoid consuming large quantities of memory.
	final collection = AnalysisContextCollection(
	includedPaths: root.includedPaths.toList(),
	excludedPaths: root.excludedPaths.toList(),
	resourceProvider: PhysicalResourceProvider.INSTANCE,
	);
	var context = collection.contexts[0];
	var pathContext = context.contextRoot.resourceProvider.pathContext;
	for (var filePath in context.contextRoot.analyzedFiles()) {
	if (file_paths.isDart(pathContext, filePath)) {
	try {
	var resolvedUnitResult =
	await context.currentSession.getResolvedUnit(filePath);
	//
	// Check for errors that cause the file to be skipped.
	//
	if (resolvedUnitResult == null) {
	print('');
	print('File $filePath skipped because of an internal error.');
	continue;
	} else if (resolvedUnitResult.state != ResultState.VALID) {
	print('');
	print('File $filePath skipped because it could not be analyzed.');
	continue;
	} else if (hasError(resolvedUnitResult)) {
	print('');
	print('File $filePath skipped due to errors:');
	for (var error in resolvedUnitResult.errors) {
	print(' ${error.toString()}');
	}
	continue;
	}

	collector.flutter = Flutter.instance;
	resolvedUnitResult.unit.accept(collector);
	} catch (exception, stackTrace) {
	print('');
	print('Exception caught analyzing: "$filePath"');
	print(exception);
	print(stackTrace);
	}
	}
	}
	}

	/// Compute and format a percentage for the fraction [value] / [total].
	String _formatPercent(int value, int total) {
	var percent = ((value / total) * 100).toStringAsFixed(1);
	if (percent.length == 3) {
	percent = ' $percent';
	} else if (percent.length == 4) {
	percent = ' $percent';
	}
	return percent;
	}

	/// Write the child data to the [sink].
	void _writeChildData(StringSink sink) {
	sink.writeln('');
	sink.writeln('The number of times a widget had a given child.');
	_writeStructureData(sink, data.childData);
	}

	/// Write the parent data to the [sink].
	void _writeParentData(StringSink sink) {
	sink.writeln('');
	sink.writeln('The number of times a widget had a given parent.');
	_writeStructureData(sink, data.parentData);
	}

	/// Write the structure data in the [structureMap] to the [sink].
	void _writeStructureData(
	StringSink sink, Map<String, Map<String, int>> structureMap) {
	var outerKeys = structureMap.keys.toList()..sort();
	for (var outerKey in outerKeys) {
	sink.writeln(outerKey);
	var innerMap = structureMap[outerKey];
	var entries = innerMap.entries.toList();
	entries.sort((first, second) => second.value.compareTo(first.value));
	var total = entries.fold(
	0, (previousValue, entry) => previousValue + entry.value);
	for (var entry in entries) {
	var percent = _formatPercent(entry.value, total);
	sink.writeln(' $percent%: ${entry.key} (${entry.value})');
	}
	}
	}

	/// Write the widget count data to the [sink].
	void _writeWidgetCounts(StringSink sink) {
	sink.writeln('');
	sink.writeln('Widget classes by frequency of instantiation');

	var total = data.totalWidgetCount;
	var entries = data.widgetCounts.entries.toList();
	entries.sort((first, second) => second.value.compareTo(first.value));
	for (var entry in entries) {
	var percent = _formatPercent(entry.value, total);
	sink.writeln(' $percent%: ${entry.key} (${entry.value})');
	}
	}

	/// Return `true` if the [result] contains an error.
	static bool hasError(ResolvedUnitResult result) {
	for (var error in result.errors) {
	if (error.severity == Severity.error) {
	return true;
	}
	}
	return false;
	}
	}