fix: remove dropped tags from general infos

parser.go

@@ -511,7 +511,7 @@ func (parser *Parser) ParseGeneralAPIInfo(mainAPIFile string) error {
 
 func parseGeneralAPIInfo(parser *Parser, comments []string) error {
 	previousAttribute := ""
-
+	var tag *spec.Tag
 	// parsing classic meta data model
 	for line := 0; line < len(comments); line++ {
 		commentLine := comments[line]
@@ -572,42 +572,43 @@ func parseGeneralAPIInfo(parser *Parser, comments []string) error {
 		case "@schemes":
 			parser.swagger.Schemes = strings.Split(value, " ")
 		case "@tag.name":
-			parser.swagger.Tags = append(parser.swagger.Tags, spec.Tag{
-				TagProps: spec.TagProps{
-					Name: value,
-				},
-			})
+			if parser.matchTag(value) {
+				parser.swagger.Tags = append(parser.swagger.Tags, spec.Tag{
+					TagProps: spec.TagProps{
+						Name: value,
+					},
+				})
+				tag = &parser.swagger.Tags[len(parser.swagger.Tags)-1]
+			} else {
+				tag = nil
+			}
 		case "@tag.description":
-			tag := parser.swagger.Tags[len(parser.swagger.Tags)-1]
-			tag.TagProps.Description = value
-			replaceLastTag(parser.swagger.Tags, tag)
+			if tag != nil {
+				tag.TagProps.Description = value
+			}
 		case "@tag.description.markdown":
-			tag := parser.swagger.Tags[len(parser.swagger.Tags)-1]
+			if tag != nil {
+				commentInfo, err := getMarkdownForTag(tag.TagProps.Name, parser.markdownFileDir)
+				if err != nil {
+					return err
+				}
 
-			commentInfo, err := getMarkdownForTag(tag.TagProps.Name, parser.markdownFileDir)
-			if err != nil {
-				return err
+				tag.TagProps.Description = string(commentInfo)
 			}
-
-			tag.TagProps.Description = string(commentInfo)
-			replaceLastTag(parser.swagger.Tags, tag)
 		case "@tag.docs.url":
-			tag := parser.swagger.Tags[len(parser.swagger.Tags)-1]
-			tag.TagProps.ExternalDocs = &spec.ExternalDocumentation{
-				URL:         value,
-				Description: "",
+			if tag != nil {
+				tag.TagProps.ExternalDocs = &spec.ExternalDocumentation{
+					URL: value,
+				}
 			}
-
-			replaceLastTag(parser.swagger.Tags, tag)
 		case "@tag.docs.description":
-			tag := parser.swagger.Tags[len(parser.swagger.Tags)-1]
-			if tag.TagProps.ExternalDocs == nil {
-				return fmt.Errorf("%s needs to come after a @tags.docs.url", attribute)
-			}
-
-			tag.TagProps.ExternalDocs.Description = value
-			replaceLastTag(parser.swagger.Tags, tag)
+			if tag != nil {
+				if tag.TagProps.ExternalDocs == nil {
+					return fmt.Errorf("%s needs to come after a @tags.docs.url", attribute)
+				}
 
+				tag.TagProps.ExternalDocs.Description = value
+			}
 		case secBasicAttr, secAPIKeyAttr, secApplicationAttr, secImplicitAttr, secPasswordAttr, secAccessCodeAttr:
 			scheme, err := parseSecAttributes(attribute, comments, &line)
 			if err != nil {
@@ -943,6 +944,27 @@ func getTagsFromComment(comment string) (tags []string) {
 
 }
 
+func (parser *Parser) matchTag(tag string) bool {
+	if len(parser.tags) == 0 {
+		return true
+	}
+
+	if _, has := parser.tags["!"+tag]; has {
+		return false
+	}
+	if _, has := parser.tags[tag]; has {
+		return true
+	}
+
+	// If all tags are negation then we should return true
+	for key := range parser.tags {
+		if key[0] != '!' {
+			return false
+		}
+	}
+	return true
+}
+
 func (parser *Parser) matchTags(comments []*ast.Comment) (match bool) {
 	if len(parser.tags) == 0 {
 		return true
@@ -1609,10 +1631,6 @@ func (parser *Parser) GetSchemaTypePath(schema *spec.Schema, depth int) []string
 	return []string{ANY}
 }
 
-func replaceLastTag(slice []spec.Tag, element spec.Tag) {
-	slice = append(slice[:len(slice)-1], element)
-}
-
 // defineTypeOfExample example value define the type (object and array unsupported).
 func defineTypeOfExample(schemaType, arrayType, exampleValue string) (interface{}, error) {
 	switch schemaType {

parser_test.go

@@ -593,6 +593,41 @@ func TestParser_ParseGeneralAPITagDocs(t *testing.T) {
 	assert.Equal(t, expected, string(b))
 }
 
+func TestParser_ParseGeneralAPITagDocsWithTagFilters(t *testing.T) {
+	t.Parallel()
+
+	filterTags := []string{"test1", "!test2"}
+
+	comments := []string{
+		"@tag.name test1",
+		"@tag.description A test1 Tag",
+		"@tag.docs.url https://example1.com",
+		"@tag.docs.description Best example1 documentation",
+		"@tag.name test2",
+		"@tag.description A test2 Tag",
+		"@tag.docs.url https://example2.com",
+		"@tag.docs.description Best example2 documentation"}
+
+	expected := `[
+    {
+        "description": "A test1 Tag",
+        "name": "test1",
+        "externalDocs": {
+            "description": "Best example1 documentation",
+            "url": "https://example1.com"
+        }
+    }
+]`
+
+	for _, tag := range filterTags {
+		parser := New(SetTags(tag))
+		err := parseGeneralAPIInfo(parser, comments)
+		assert.NoError(t, err)
+		b, _ := json.MarshalIndent(parser.GetSwagger().Tags, "", "    ")
+		assert.Equal(t, expected, string(b))
+	}
+}
+
 func TestParser_ParseGeneralAPISecurity(t *testing.T) {
 	t.Run("ApiKey", func(t *testing.T) {
 		t.Parallel()