Remove @image directive. (#3568)

* Remove @image directive.

* Change README to have quotes.

* Remove quotes.

README.md

@@ -215,16 +215,14 @@ library my_library;
 
 A file `categories.json` will be generated at the top level of the documentation tree with
 information about categories collected from objects in the source tree.  The directives
-`@category`, `@subCategory`, and `@image` are understood and saved into this json.
-Future versions of dartdoc may make direct use of the image tags.
+`@category`, and `@subCategory` are understood and saved into this json.
 
 As an example, if we document the class Icon in flutter using the following:
 
 ```dart
 /// {@category Basics}
-/// {@category Assets, Images, and Icons}
+/// {@category Assets and Icons}
 /// {@subCategory Information displays}
-/// {@image <image alt='' src='/images/catalog-widget-placeholder.png'>}
 class Icon extends StatelessWidget {}
 ```
 
@@ -237,13 +235,12 @@ that will result in the following json:
     "href": "widgets/Icon-class.html",
     "type": "class",
     "categories": [
-      "Assets, Images, and Icons",
+      "Assets and Icons",
       "Basics"
     ],
     "subcategories": [
       "Information displays"
     ],
-    "image": "<image alt='' src='/images/catalog-widget-placeholder.png'>"
   }
 ```
 

lib/src/generator/generator_utils.dart

@@ -24,7 +24,6 @@ String generateCategoryJson(Iterable<Categorization> categories, bool pretty) {
           'categories': categorization.categoryNames,
         if (categorization.hasSubCategoryNames)
           'subcategories': categorization.subCategoryNames,
-        if (categorization.hasImage) 'image': categorization.image,
       }
   ];
 

lib/src/generator/templates.runtime_renderers.dart

@@ -966,41 +966,13 @@ class _Renderer_Categorization extends RendererBase<Categorization> {
                       self.renderSimpleVariable(c, remainingNames, 'bool'),
                   getBool: (CT_ c) => c.hasCategoryNames == true,
                 ),
-                'hasImage': Property(
-                  getValue: (CT_ c) => c.hasImage,
-                  renderVariable: (CT_ c, Property<CT_> self,
-                          List<String> remainingNames) =>
-                      self.renderSimpleVariable(c, remainingNames, 'bool'),
-                  getBool: (CT_ c) => c.hasImage == true,
-                ),
                 'hasSubCategoryNames': Property(
                   getValue: (CT_ c) => c.hasSubCategoryNames,
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'bool'),
                   getBool: (CT_ c) => c.hasSubCategoryNames == true,
                 ),
-                'image': Property(
-                  getValue: (CT_ c) => c.image,
-                  renderVariable:
-                      (CT_ c, Property<CT_> self, List<String> remainingNames) {
-                    if (remainingNames.isEmpty) {
-                      return self.getValue(c).toString();
-                    }
-                    var name = remainingNames.first;
-                    var nextProperty =
-                        _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(
-                        self.getValue(c) as String,
-                        nextProperty,
-                        [...remainingNames.skip(1)]);
-                  },
-                  isNullValue: (CT_ c) => c.image == null,
-                  renderValue: (CT_ c, RendererBase<CT_> r,
-                      List<MustachioNode> ast, StringSink sink) {
-                    _render_String(c.image!, ast, r.template, sink, parent: r);
-                  },
-                ),
                 'subCategoryNames': Property(
                   getValue: (CT_ c) => c.subCategoryNames,
                   renderVariable: (CT_ c, Property<CT_> self,

lib/src/model/directives/categorization.dart

@@ -6,9 +6,8 @@ import 'package:collection/collection.dart';
 import 'package:dartdoc/src/model/model.dart';
 import 'package:meta/meta.dart';
 
-final RegExp _categoryRegExp = RegExp(
-    r'[ ]*{@(category|subCategory|image) (.+?)}[ ]*\n?',
-    multiLine: true);
+final RegExp _categoryRegExp =
+    RegExp(r'[ ]*{@(category|subCategory) (.+?)}[ ]*\n?', multiLine: true);
 
 /// Mixin parsing the `@category` directive for ModelElements.
 mixin Categorization on DocumentationComment implements Indexable {
@@ -31,15 +30,12 @@ mixin Categorization on DocumentationComment implements Indexable {
           categorySet.add(match[2]!.trim());
         case 'subCategory':
           subCategorySet.add(match[2]!.trim());
-        case 'image':
-          _image = match[2]!.trim();
       }
       return '';
     });
 
     _categoryNames = categorySet.toList(growable: false)..sort();
     _subCategoryNames = subCategorySet.toList(growable: false)..sort();
-    _image ??= '';
     return rawDocs;
   }
 
@@ -65,17 +61,6 @@ mixin Categorization on DocumentationComment implements Indexable {
     return _categoryNames;
   }
 
-  bool get hasImage => image!.isNotEmpty;
-  String? _image;
-
-  /// Either a URI to a defined image,
-  /// or 'null' if one was not declared.
-  String? get image {
-    // TODO(jcollins-g): avoid side-effect dependency
-    if (_image == null) documentationLocal;
-    return _image;
-  }
-
   @visibleForTesting
   List<Category> get categories => [
         ...?categoryNames?.map((n) => package.nameToCategory[n]).whereNotNull()

lib/src/model/documentation_comment.dart

@@ -158,7 +158,6 @@ mixin DocumentationComment
     'canonicalFor',
     'category',
     'hideConstantImplementations',
-    'image',
     'subCategory',
 
     // Common Dart annotations which may decorate named parameters: