candies_analyzer_plugin #

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Description #

The plugin to help create custom lint quickly.

candies_analyzer_plugin

Create Template #

activate plugin

run dart pub global activate candies_analyzer_plugin
cd to your project

Let us suppose:

your project is example

your lint plugin is custom_lint

run candies_analyzer_plugin custom_lint, a simple lint plugin is generated.
add custom_lint into dev_dependencies of the root pubspec.yaml

dev_dependencies:
  # zmtzawqlp  
  custom_lint:
    path: custom_lint/

add custom_lint into analyzer plugins of the root analysis_options.yaml

analyzer:
  # zmtzawqlp  
  plugins:
    custom_lint

after analysis are finished, you will see some custom lint in your ide.

Add your lint #

find plugin.dart base on following project tree

├─ example
│  ├─ custom_lint
│  │  └─ tools
│  │     └─ analyzer_plugin
│  │        ├─ bin
│  │        │  └─ plugin.dart

plugin.dart is the entrance of plugin.

start plugin #

we start plugin in this file.

CandiesAnalyzerPlugin get plugin => CustomLintPlugin();

// This file must be 'plugin.dart'
void main(List<String> args, SendPort sendPort) {
  CandiesAnalyzerPluginStarter.start(
    args,
    sendPort,
    plugin: plugin,
  );
}

class CustomLintPlugin extends CandiesAnalyzerPlugin {
  @override
  String get name => 'custom_lint';

  @override
  List<String> get fileGlobsToAnalyze => const <String>[
        '**/*.dart',
        '**/*.yaml',
        '**/*.json',
      ];

  @override
  List<DartLint> get dartLints => <DartLint>[
        // add your dart lint here
        PerferCandiesClassPrefix(),
        ...super.dartLints,
      ];

  @override
  List<YamlLint> get yamlLints => <YamlLint>[RemoveDependency(package: 'path')];

  @override
  List<GenericLint> get genericLints => <GenericLint>[RemoveDuplicateValue()];
}

create a lint #

you just need to make a custom lint which extends from DartLint ,YamlLint, GenericLint.

Properties:

Property	Description	Default
code	The name, as a string, of the error code associated with this error.	required
message	The message to be displayed for this error. The message should indicate what is wrong with the code and why it is wrong.	required
url	The URL of a page containing documentation associated with this error.
type	The type of the error. CHECKED_MODE_COMPILE_TIME_ERROR COMPILE_TIME_ERROR HINT LINT STATIC_TYPE_WARNING STATIC_WARNING SYNTACTIC_ERROR TODO	The default is LINT.
severity	The severity of the error. INFO WARNING ERROR	The default is INFO.
correction	The correction message to be displayed for this error. The correction message should indicate how the user can fix the error. The field is omitted if there is no correction message associated with the error code.
contextMessages	Additional messages associated with this diagnostic that provide context to help the user understand the diagnostic.

Important methodes:

Method	Description	Override
matchLint	return whether is match lint.	must
getDartFixes/getYamlFixes/getGenericFixes	return fixes if has.	getYamlFixes/getGenericFixes doesn't work for now, leave it in case dart team maybe support it someday in the future, see issue

dart lint

Here is a demo for a dart lint:

class PerferCandiesClassPrefix extends DartLint {
  @override
  String get code => 'perfer_candies_class_prefix';

  @override
  String? get url => 'https://github.com/fluttercandies/candies_analyzer_plugin';

  @override
  SyntacticEntity? matchLint(AstNode node) {
    if (node is ClassDeclaration) {
      final String name = node.name2.toString();
      final int startIndex = _getClassNameStartIndex(name);
      if (!name.substring(startIndex).startsWith('Candies')) {
        return node.name2;
      }
    }
    return null;
  }

  @override
  String get message => 'Define a class name start with Candies';

  @override
  Future<List<SourceChange>> getDartFixes(
    ResolvedUnitResult resolvedUnitResult,
    AstNode astNode,
  ) async {
    // get name node
    final Token nameNode = (astNode as ClassDeclaration).name2;
    final String nameString = nameNode.toString();
    return <SourceChange>[
      await getDartFix(
        resolvedUnitResult: resolvedUnitResult,
        message: 'Use Candies as a class prefix.',
        buildDartFileEdit: (DartFileEditBuilder dartFileEditBuilder) {
          final int startIndex = _getClassNameStartIndex(nameString);

          final RegExp regExp = RegExp(nameString);

          final String replace =
              '${nameString.substring(0, startIndex)}Candies${nameString.substring(startIndex)}';

          for (final Match match
              in regExp.allMatches(resolvedUnitResult.content)) {
            dartFileEditBuilder.addSimpleReplacement(
                SourceRange(match.start, match.end - match.start), replace);
          }

          dartFileEditBuilder.formatAll(resolvedUnitResult.unit);
        },
      )
    ];
  }

  int _getClassNameStartIndex(String nameString) {
    int index = 0;
    while (nameString[index] == '_') {
      index++;
      if (index == nameString.length - 1) {
        break;
      }
    }
    return index;
  }
}

yaml lint

Here is a demo for a yaml lint:

class RemoveDependency extends YamlLint {
  RemoveDependency({required this.package});
  final String package;
  @override
  String get code => 'remove_${package}_dependency';

  @override
  String get message => 'don\'t use $package!';

  @override
  String? get correction => 'Remove $package dependency';

  @override
  AnalysisErrorSeverity get severity => AnalysisErrorSeverity.WARNING;

  @override
  Iterable<SourceRange> matchLint(
    YamlNode root,
    String content,
    LineInfo lineInfo,
  ) sync* {
    if (root is YamlMap && root.containsKey(PubspecField.DEPENDENCIES_FIELD)) {
      final YamlNode dependencies =
          root.nodes[PubspecField.DEPENDENCIES_FIELD]!;
      if (dependencies is YamlMap && dependencies.containsKey(package)) {
        final YamlNode get = dependencies.nodes[package]!;
        int start = dependencies.span.start.offset;
        final int end = get.span.start.offset;
        final int index = content.substring(start, end).indexOf('$package: ');
        start += index;
        yield SourceRange(start, get.span.end.offset - start);
      }
    }
  }
}

generic lint

Here is a demo for a generic lint:

class RemoveDuplicateValue extends GenericLint {
  @override
  String get code => 'remove_duplicate_value';

  @override
  Iterable<SourceRange> matchLint(
    String content,
    String file,
    LineInfo lineInfo,
  ) sync* {
    if (isFileType(file: file, type: '.json')) {
      final Map<dynamic, dynamic> map =
          jsonDecode(content) as Map<dynamic, dynamic>;

      final Map<dynamic, dynamic> duplicate = <dynamic, dynamic>{};
      final Map<dynamic, dynamic> checkDuplicate = <dynamic, dynamic>{};
      for (final dynamic key in map.keys) {
        final dynamic value = map[key];
        if (checkDuplicate.containsKey(value)) {
          duplicate[key] = value;
          duplicate[checkDuplicate[value]] = value;
        }
        checkDuplicate[value] = key;
      }

      if (duplicate.isNotEmpty) {
        for (final dynamic key in duplicate.keys) {
          final int start = content.indexOf('"$key"');
          final dynamic value = duplicate[key];
          final int end = content.indexOf(
                '"$value"',
                start,
              ) +
              value.toString().length +
              1;

          final int lineNumber = lineInfo.getLocation(end).lineNumber;

          bool hasComma = false;
          int commaIndex = end;
          int commaLineNumber = lineInfo.getLocation(commaIndex).lineNumber;

          while (!hasComma && commaLineNumber == lineNumber) {
            commaIndex++;
            final String char = content[commaIndex];
            hasComma = char == ',';
            commaLineNumber = lineInfo.getLocation(commaIndex).lineNumber;
          }

          yield SourceRange(start, (hasComma ? commaIndex : end) + 1 - start);
        }
      }
    }
  }

  @override
  String get message => 'remove duplicate value';
}

Debug #

debug lint #

find debug.dart base on following project tree

├─ example
│  ├─ custom_lint
│  │  └─ tools
│  │     └─ analyzer_plugin
│  │        ├─ bin
│  │        │  └─ debug.dart

change root to which you want to debug, default is example folder.

import 'dart:io';
import 'package:analyzer/dart/analysis/analysis_context.dart';
import 'package:analyzer/dart/analysis/analysis_context_collection.dart';
import 'package:analyzer_plugin/protocol/protocol_common.dart';
import 'package:analyzer_plugin/protocol/protocol_generated.dart';
import 'package:candies_analyzer_plugin/candies_analyzer_plugin.dart';
import 'plugin.dart';

Future<void> main(List<String> args) async {
  final String root = Directory.current.parent.parent.parent.path;
  final AnalysisContextCollection collection =
      AnalysisContextCollection(includedPaths: <String>[root]);

  final CandiesAnalyzerPlugin myPlugin = plugin;
  for (final AnalysisContext context in collection.contexts) {
    for (final String file in context.contextRoot.analyzedFiles()) {
      if (!myPlugin.shouldAnalyzeFile(file, context)) {
        continue;
      }

      final bool isAnalyzed = context.contextRoot.isAnalyzed(file);
      if (!isAnalyzed) {
        continue;
      }

      final List<AnalysisError> errors =
          (await myPlugin.getAnalysisErrorsForDebug(
        file,
        context,
      ))
              .toList();
      for (final AnalysisError error in errors) {
        final List<AnalysisErrorFixes> fixes = await myPlugin
            .getAnalysisErrorFixesForDebug(
                EditGetFixesParams(file, error.location.offset), context)
            .toList();
        print(fixes.length);
      }

      print(errors.length);
    }
  }
}

update code #

├─ example
│  ├─ custom_lint
│  │  └─ tools
│  │     └─ analyzer_plugin

you have two options to update new code into dartServer.

delete .plugin_manager folder

Note, analyzer_plugin folder will be copyed into .plugin_manager and create a folder base on encrypt plugin path.

macos: /Users/user_name/.dartServer/.plugin_manager/

windows: C:\Users\user_name\AppData\Local\.dartServer\.plugin_manager\

if your code is changed, please remove the files under .plugin_manager.

or you can run candies_analyzer_plugin clear_cache to remove the files under .plugin_manager.

write new code under custom_lint folder

you can write new code under custom_lint, for exmaple, in custom_lint.dart.

├─ example
│  ├─ custom_lint
│  │  ├─ lib
│  │  │  └─ custom_lint.dart

so you should add custom_lint dependencies into analyzer_plugin\pubspec.yaml

you should use absolute path due to analyzer_plugin folder will copy to .plugin_manager.

if your don't publish custom_lint as new package, i don't suggest do as this.

├─ example
│  ├─ custom_lint
│  │  ├─ lib
│  │  │  └─ custom_lint.dart
│  │  └─ tools
│  │     └─ analyzer_plugin
│  │        ├─ analysis_options.yaml

dependencies:
  custom_lint: 
    # absolute path  
    path: xxx/xxx/custom_lint
  candies_analyzer_plugin: any
  path: any
  analyzer: any
  analyzer_plugin: any

restart server #

after update code, you should restart analysis server by following steps in vscode.

find Command Palette in View

enter Restart Analysis Server

now, you can see the new change.

Log #

for performance, default is false, if you want to check log, set it to true. you can open Log.

CandiesAnalyzerPluginLogger().shouldLog = true;

Under the project custom_lint.log will be generated.

you can custom log name

CandiesAnalyzerPluginLogger().logFileName = 'your name';
log info

   CandiesAnalyzerPluginLogger().log(
        'info',
        // which location custom_lint.log will be generated
        root: result.root,
      );

log error

   CandiesAnalyzerPluginLogger().logError(
     'analyze file failed:',
     root: analysisContext.root,
     error: e,
     stackTrace: stackTrace,
   );

Config #

disable a lint #

As default, all of the custom lints are enable. And you can also write a config in analysis_options.yaml to disable they.

add ignore for a lint.

analyzer:
  errors:
    perfer_candies_class_prefix: ignore

exclude files

analyzer:
  exclude:
    - lib/exclude/*.dart

disable a lint

linter:
  rules:
    # disable a lint
    perfer_candies_class_prefix: false

include #

we can define include tag under custom_lint (it's your plugin name). it means that we only analyze the include files.


# your plugin name
custom_lint:
  # if we define this, we only analyze include files
  include: 
    - lib/include/*.dart

custom lint severity #

you can change lint severity by following setting.

change the severity of perfer_candies_class_prefix from info to warning.

support warning , info , error.

analyzer:
  errors:
    # override error severity
    perfer_candies_class_prefix: warning

Default lints #

PerferClassPrefix #

Define a class name start with prefix

class PerferClassPrefix extends DartLint {
  PerferClassPrefix(this.prefix);

  final String prefix;

  @override
  String get code => 'perfer_${prefix}_class_prefix';
}

PreferAssetConst #

Prefer to use asset const instead of a string.

class PreferAssetConst extends DartLint {
  @override
  String get code => 'prefer_asset_const';
  @override
  String? get url => 'https://pub.dev/packages/assets_generator';  
}

PreferNamedRoutes #

Prefer to use named routes.

class PreferNamedRoutes extends DartLint {
  @override
  String get code => 'prefer_named_routes';
  @override
  String? get url => 'https://pub.dev/packages/ff_annotation_route';  
}

PerferSafeSetState #

Prefer to check mounted before setState

class PerferSafeSetState extends DartLint {
  @override
  String get code => 'prefer_safe_setState';
}

MustCallSuperDispose #

Implementations of this method should end with a call to the inherited method, as in super.dispose().

class MustCallSuperDispose extends DartLint with CallSuperDisposeMixin {
  @override
  String get code => 'must_call_super_dispose';
}

EndCallSuperDispose #

Should call super.dispose() at the end of this method.

class EndCallSuperDispose extends DartLint with CallSuperDisposeMixin {
  @override
  String get code => 'end_call_super_dispose';
}

Completion #

Make a custom completion #

you can define your CompletionContributor in completionContributors, ExtensionMemberContributor is default.

  /// The completionContributors to finish CompletionRequest
  List<CompletionContributor> get completionContributors =>
      <CompletionContributor>[
        ExtensionMemberContributor(),
      ];

Suggestions of Extension Member #

Although dart team had close the issue Auto import (or quickfix?) for Extensions · Issue #38894 · dart-lang/sdk (github.com) , but still has many problems when developing in different ide.

ExtensionMemberContributor help to handle extension member easily.

Note #

print lag #

don't write print in the process of analyzing in your plugin, analysis will lag.

pubspec.yaml and analysis_options.yaml #

you must do following things to support your project to be analyzed.

add custom_lint into dev_dependencies in pubspec.yaml , see pubspec.yaml
add custom_lint into analyzer plugins in analysis_options.yaml see analysis_options.yaml

quick fixes are only supported for dart files in vscode.(android studio support any type of file) #

issue

completion auto import is not working in vscode #