update lints, require Dart 3.0 (dart-archive/yaml#156)

* switch expressions
* dry up logic

Author: kevmoo

pkgs/yaml/.github/workflows/test-package.yml

@@ -47,7 +47,7 @@ jobs:
       matrix:
         # Add macos-latest and/or windows-latest if relevant for this package.
         os: [ubuntu-latest]
-        sdk: [2.19.0, dev]
+        sdk: [3.0.0, dev]
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
       - uses: dart-lang/setup-dart@b64355ae6ca0b5d484f0106a033dd1388965d06d

pkgs/yaml/CHANGELOG.md

@@ -1,5 +1,7 @@
 ## 3.1.3-wip
 
+* Require Dart 3.0
+
 ## 3.1.2
 
 * Require Dart 2.19

pkgs/yaml/analysis_options.yaml

@@ -16,7 +16,4 @@ linter:
     - package_api_docs
     - prefer_const_declarations
     - prefer_expression_function_bodies
-    - prefer_relative_imports
-    - test_types_in_equals
     - use_string_buffers
-    - use_super_parameters

pkgs/yaml/lib/src/equality.dart

@@ -24,8 +24,8 @@ bool deepEquals(Object? obj1, Object? obj2) => _DeepEquals().equals(obj1, obj2);
 /// A class that provides access to the list of parent objects used for loop
 /// detection.
 class _DeepEquals {
-  final _parents1 = [];
-  final _parents2 = [];
+  final _parents1 = <Object?>[];
+  final _parents2 = <Object?>[];
 
   /// Returns whether [obj1] and [obj2] are structurally equivalent.
   bool equals(Object? obj1, Object? obj2) {
@@ -101,19 +101,19 @@ class _DeepEquals {
 /// self-referential structures, and returns the same hash code for
 /// [YamlScalar]s and their values.
 int deepHashCode(Object? obj) {
-  var parents = [];
+  var parents = <Object?>[];
 
   int deepHashCodeInner(Object? value) {
     if (parents.any((parent) => identical(parent, value))) return -1;
 
     parents.add(value);
     try {
       if (value is Map) {
-        var equality = const UnorderedIterableEquality();
+        var equality = const UnorderedIterableEquality<Object?>();
         return equality.hash(value.keys.map(deepHashCodeInner)) ^
             equality.hash(value.values.map(deepHashCodeInner));
       } else if (value is Iterable) {
-        return const IterableEquality().hash(value.map(deepHashCode));
+        return const IterableEquality<Object?>().hash(value.map(deepHashCode));
       } else if (value is YamlScalar) {
         return (value.value as Object?).hashCode;
       } else {

pkgs/yaml/lib/src/error_listener.dart

@@ -7,7 +7,7 @@
 
 import 'yaml_exception.dart';
 
-/// A listener that is notified of [YamlError]s during scanning/parsing.
+/// A listener that is notified of [YamlException]s during scanning/parsing.
 abstract class ErrorListener {
   /// This method is invoked when an [error] has been found in the YAML.
   void onError(YamlException error);

pkgs/yaml/lib/src/event.dart

@@ -7,6 +7,7 @@
 
 import 'package:source_span/source_span.dart';
 
+import 'parser.dart';
 import 'style.dart';
 import 'yaml_document.dart';
 

pkgs/yaml/lib/src/loader.dart

@@ -80,20 +80,14 @@ class Loader {
   }
 
   /// Composes a node.
-  YamlNode _loadNode(Event firstEvent) {
-    switch (firstEvent.type) {
-      case EventType.alias:
-        return _loadAlias(firstEvent as AliasEvent);
-      case EventType.scalar:
-        return _loadScalar(firstEvent as ScalarEvent);
-      case EventType.sequenceStart:
-        return _loadSequence(firstEvent as SequenceStartEvent);
-      case EventType.mappingStart:
-        return _loadMapping(firstEvent as MappingStartEvent);
-      default:
-        throw StateError('Unreachable');
-    }
-  }
+  YamlNode _loadNode(Event firstEvent) => switch (firstEvent.type) {
+        EventType.alias => _loadAlias(firstEvent as AliasEvent),
+        EventType.scalar => _loadScalar(firstEvent as ScalarEvent),
+        EventType.sequenceStart =>
+          _loadSequence(firstEvent as SequenceStartEvent),
+        EventType.mappingStart => _loadMapping(firstEvent as MappingStartEvent),
+        _ => throw StateError('Unreachable')
+      };
 
   /// Registers an anchor.
   void _registerAnchor(String? anchor, YamlNode node) {
@@ -220,61 +214,37 @@ class Loader {
 
     // Dispatch on the first character.
     var firstChar = scalar.value.codeUnitAt(0);
-    switch (firstChar) {
-      case $dot:
-      case $plus:
-      case $minus:
-        return _parseNumber(scalar);
-      case $n:
-      case $N:
-        return length == 4 ? _parseNull(scalar) : null;
-      case $t:
-      case $T:
-        return length == 4 ? _parseBool(scalar) : null;
-      case $f:
-      case $F:
-        return length == 5 ? _parseBool(scalar) : null;
-      case $tilde:
-        return length == 1 ? YamlScalar.internal(null, scalar) : null;
-      default:
-        if (firstChar >= $0 && firstChar <= $9) return _parseNumber(scalar);
-        return null;
-    }
+    return switch (firstChar) {
+      $dot || $plus || $minus => _parseNumber(scalar),
+      $n || $N => length == 4 ? _parseNull(scalar) : null,
+      $t || $T => length == 4 ? _parseBool(scalar) : null,
+      $f || $F => length == 5 ? _parseBool(scalar) : null,
+      $tilde => length == 1 ? YamlScalar.internal(null, scalar) : null,
+      _ => (firstChar >= $0 && firstChar <= $9) ? _parseNumber(scalar) : null
+    };
   }
 
   /// Parse a null scalar.
   ///
   /// Returns a Dart `null` if parsing fails.
-  YamlScalar? _parseNull(ScalarEvent scalar) {
-    switch (scalar.value) {
-      case '':
-      case 'null':
-      case 'Null':
-      case 'NULL':
-      case '~':
-        return YamlScalar.internal(null, scalar);
-      default:
-        return null;
-    }
-  }
+  YamlScalar? _parseNull(ScalarEvent scalar) => switch (scalar.value) {
+        '' ||
+        'null' ||
+        'Null' ||
+        'NULL' ||
+        '~' =>
+          YamlScalar.internal(null, scalar),
+        _ => null
+      };
 
   /// Parse a boolean scalar.
   ///
   /// Returns `null` if parsing fails.
-  YamlScalar? _parseBool(ScalarEvent scalar) {
-    switch (scalar.value) {
-      case 'true':
-      case 'True':
-      case 'TRUE':
-        return YamlScalar.internal(true, scalar);
-      case 'false':
-      case 'False':
-      case 'FALSE':
-        return YamlScalar.internal(false, scalar);
-      default:
-        return null;
-    }
-  }
+  YamlScalar? _parseBool(ScalarEvent scalar) => switch (scalar.value) {
+        'true' || 'True' || 'TRUE' => YamlScalar.internal(true, scalar),
+        'false' || 'False' || 'FALSE' => YamlScalar.internal(false, scalar),
+        _ => null
+      };
 
   /// Parses a numeric scalar.
   ///

pkgs/yaml/lib/src/null_span.dart

@@ -7,6 +7,8 @@
 
 import 'package:source_span/source_span.dart';
 
+import 'yaml_node.dart';
+
 /// A [SourceSpan] with no location information.
 ///
 /// This is used with [YamlMap.wrap] and [YamlList.wrap] to provide means of
@@ -20,5 +22,5 @@ class NullSpan extends SourceSpanMixin {
   @override
   final text = '';
 
-  NullSpan(sourceUrl) : start = SourceLocation(0, sourceUrl: sourceUrl);
+  NullSpan(Object? sourceUrl) : start = SourceLocation(0, sourceUrl: sourceUrl);
 }

pkgs/yaml/lib/src/scanner.dart

@@ -124,7 +124,7 @@ class Scanner {
 
   /// The number of tokens that have been emitted.
   ///
-  /// This doesn't count tokens in [tokens].
+  /// This doesn't count tokens in [_tokens].
   var _tokensParsed = 0;
 
   /// Whether the next token in [_tokens] is ready to be returned.
@@ -249,21 +249,12 @@ class Scanner {
   /// See http://yaml.org/spec/1.2/spec.html#nb-char.
   bool get _isNonBreak {
     var char = _scanner.peekChar();
-    if (char == null) return false;
-    switch (char) {
-      case LF:
-      case CR:
-      case BOM:
-        return false;
-      case TAB:
-      case NEL:
-        return true;
-      default:
-        return (char >= 0x00020 && char <= 0x00007E) ||
-            (char >= 0x000A0 && char <= 0x00D7FF) ||
-            (char >= 0x0E000 && char <= 0x00FFFD) ||
-            (char >= 0x10000 && char <= 0x10FFFF);
-    }
+    return switch (char) {
+      null => false,
+      LF || CR || BOM => false,
+      TAB || NEL => true,
+      _ => _isStandardCharacter(char),
+    };
   }
 
   /// Whether the character at the current position is a printable character
@@ -272,21 +263,12 @@ class Scanner {
   /// See http://yaml.org/spec/1.2/spec.html#nb-char.
   bool get _isNonSpace {
     var char = _scanner.peekChar();
-    if (char == null) return false;
-    switch (char) {
-      case LF:
-      case CR:
-      case BOM:
-      case SP:
-        return false;
-      case NEL:
-        return true;
-      default:
-        return (char >= 0x00020 && char <= 0x00007E) ||
-            (char >= 0x000A0 && char <= 0x00D7FF) ||
-            (char >= 0x0E000 && char <= 0x00FFFD) ||
-            (char >= 0x10000 && char <= 0x10FFFF);
-    }
+    return switch (char) {
+      null => false,
+      LF || CR || BOM || SP => false,
+      NEL => true,
+      _ => _isStandardCharacter(char),
+    };
   }
 
   /// Returns Whether or not the current character begins a documentation
@@ -830,7 +812,7 @@ class Scanner {
     }
   }
 
-  /// Scans a [TokenType.YAML_DIRECTIVE] or [TokenType.tagDirective] token.
+  /// Scans a [TokenType.versionDirective] or [TokenType.tagDirective] token.
   ///
   ///     %YAML    1.2    # a comment \n
   ///     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -1593,32 +1575,28 @@ class Scanner {
   /// See http://yaml.org/spec/1.2/spec.html#ns-plain-safe(c).
   bool _isPlainSafeAt(int offset) {
     var char = _scanner.peekChar(offset);
-    switch (char) {
-      case COMMA:
-      case LEFT_SQUARE:
-      case RIGHT_SQUARE:
-      case LEFT_CURLY:
-      case RIGHT_CURLY:
+    return switch (char) {
+      null => false,
+      COMMA ||
+      LEFT_SQUARE ||
+      RIGHT_SQUARE ||
+      LEFT_CURLY ||
+      RIGHT_CURLY =>
         // These characters are delimiters in a flow context and thus are only
         // safe in a block context.
-        return _inBlockContext;
-      case SP:
-      case TAB:
-      case LF:
-      case CR:
-      case BOM:
-        return false;
-      case NEL:
-        return true;
-      default:
-        return char != null &&
-            ((char >= 0x00020 && char <= 0x00007E) ||
-                (char >= 0x000A0 && char <= 0x00D7FF) ||
-                (char >= 0x0E000 && char <= 0x00FFFD) ||
-                (char >= 0x10000 && char <= 0x10FFFF));
-    }
+        _inBlockContext,
+      SP || TAB || LF || CR || BOM => false,
+      NEL => true,
+      _ => _isStandardCharacter(char)
+    };
   }
 
+  bool _isStandardCharacter(int char) =>
+      (char >= 0x00020 && char <= 0x00007E) ||
+      (char >= 0x000A0 && char <= 0x00D7FF) ||
+      (char >= 0x0E000 && char <= 0x00FFFD) ||
+      (char >= 0x10000 && char <= 0x10FFFF);
+
   /// Returns the hexidecimal value of [char].
   int _asHex(int char) {
     if (char <= NUMBER_9) return char - NUMBER_0;
@@ -1656,7 +1634,7 @@ class _SimpleKey {
   /// The index of the token that begins the simple key.
   ///
   /// This is the index relative to all tokens emitted, rather than relative to
-  /// [_tokens].
+  /// [location].
   final int tokenNumber;
 
   /// The source location of the beginning of the simple key.

pkgs/yaml/lib/src/style.dart

@@ -7,6 +7,8 @@
 
 // ignore_for_file: constant_identifier_names
 
+import 'yaml_node.dart';
+
 /// An enum of source scalar styles.
 class ScalarStyle {
   /// No source style was specified.