Add a new parseJabRefComment with unit test

src/main/java/org/jabref/logic/importer/fileformat/BibtexParser.java

@@ -58,6 +58,9 @@
 import com.dd.plist.BinaryPropertyListParser;
 import com.dd.plist.NSDictionary;
 import com.dd.plist.NSString;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.w3c.dom.Document;
@@ -354,8 +357,8 @@ private void parseJabRefComment(Map<String, String> meta) {
         // We remove all line breaks in the metadata
         // These have been inserted to prevent too long lines when the file was saved, and are not part of the data.
         String comment = buffer.toString().replaceAll("[\\x0d\\x0a]", "");
-        if (comment.substring(0, Math.min(comment.length(), MetaData.META_FLAG.length())).equals(MetaData.META_FLAG)) {
-            if (comment.startsWith(MetaData.META_FLAG)) {
+
+        if (comment.startsWith(MetaData.META_FLAG)) {
                 String rest = comment.substring(MetaData.META_FLAG.length());
 
                 int pos = rest.indexOf(':');
@@ -366,9 +369,7 @@ private void parseJabRefComment(Map<String, String> meta) {
                     // meta comments are always re-written by JabRef and not stored in the file
                     dumpTextReadSoFarToString();
                 }
-            }
-        } else if (comment.substring(0, Math.min(comment.length(), MetaData.ENTRYTYPE_FLAG.length()))
-                          .equals(MetaData.ENTRYTYPE_FLAG)) {
+        } else if (comment.startsWith(MetaData.ENTRYTYPE_FLAG)) {
             // A custom entry type can also be stored in a
             // "@comment"
             Optional<BibEntryType> typ = MetaDataParser.parseCustomEntryType(comment);
@@ -389,6 +390,13 @@ private void parseJabRefComment(Map<String, String> meta) {
         }
     }
 
+    @VisibleForTesting
+    Optional<JsonObject> parseCommentToJson(String comment) {
+        String content = comment.substring(comment.indexOf(MetaData.META_FLAG_VERSION_010) + MetaData.META_FLAG_VERSION_010.length());
+        Gson gson = new Gson();
+        return Optional.ofNullable(gson.fromJson(content, JsonObject.class));
+    }
+
     /**
      * Adds BibDesk group entries to the JabRef database
      */

src/main/java/org/jabref/logic/importer/util/MetaDataParser.java

@@ -96,7 +96,7 @@ public static Optional<BibEntryType> parseCustomEntryType(String comment) {
     public MetaData parse(Map<String, String> data, Character keywordSeparator) throws ParseException {
         return parse(new MetaData(), data, keywordSeparator);
     }
-
+    
     /**
      * Parses the data map and changes the given {@link MetaData} instance respectively.
      *

src/main/java/org/jabref/model/metadata/MetaData.java

@@ -31,13 +31,12 @@
 import com.google.common.eventbus.EventBus;
 import com.tobiasdiez.easybind.optional.OptionalBinding;
 import com.tobiasdiez.easybind.optional.OptionalWrapper;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 @AllowedToUseLogic("because it needs access to citation pattern and cleanups")
 public class MetaData {
 
     public static final String META_FLAG = "jabref-meta: ";
+    public static final String META_FLAG_VERSION_010 = "jabref-meta-0.1.0";
     public static final String ENTRYTYPE_FLAG = "jabref-entrytype: ";
     public static final String SAVE_ORDER_CONFIG = "saveOrderConfig"; // ToDo: Rename in next major version to saveOrder, adapt testbibs
     public static final String SAVE_ACTIONS = "saveActions";
@@ -58,8 +57,6 @@ public class MetaData {
     public static final char SEPARATOR_CHARACTER = ';';
     public static final String SEPARATOR_STRING = String.valueOf(SEPARATOR_CHARACTER);
 
-    private static final Logger LOGGER = LoggerFactory.getLogger(MetaData.class);
-
     private final EventBus eventBus = new EventBus();
     private final Map<EntryType, String> citeKeyPatterns = new HashMap<>(); // <BibType, Pattern>
     private final Map<String, String> userFileDirectory = new HashMap<>(); // <User, FilePath>

src/test/java/org/jabref/logic/importer/fileformat/BibtexParserTest.java

@@ -57,6 +57,8 @@
 import org.jabref.model.groups.WordKeywordGroup;
 import org.jabref.model.metadata.SaveOrder;
 
+import com.google.gson.JsonArray;
+import com.google.gson.JsonObject;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
@@ -2238,4 +2240,42 @@ void parseInvalidBibDeskFilesResultsInWarnings() throws IOException {
 
         assertEquals(List.of(firstEntry, secondEntry), result.getDatabase().getEntries());
     }
+
+    @Test
+    void parseCommentToJson() {
+        String entries =
+                """
+                    @Comment{jabref-meta-0.1.0
+                        {
+                            "saveActions" :
+                            {
+                                "state": true,
+                                "date": ["normalize_date", "action2"],
+                                "pages" : ["normalize_page_numbers"],
+                                "month" : ["normalize_month"]
+                            }
+                        }
+                """;
+        BibtexParser parser = new BibtexParser(importFormatPreferences);
+        Optional<JsonObject> actualJson = parser.parseCommentToJson(entries);
+        assertEquals(actualJson, Optional.of(getExpectedJson()));
+    }
+
+    private JsonObject getExpectedJson() {
+        JsonObject saveActions = new JsonObject();
+        saveActions.addProperty("state", true);
+        JsonArray dateArray = new JsonArray();
+        dateArray.add("normalize_date");
+        dateArray.add("action2");
+        saveActions.add("date", dateArray);
+        JsonArray pagesArray = new JsonArray();
+        pagesArray.add("normalize_page_numbers");
+        saveActions.add("pages", pagesArray);
+        JsonArray monthArray = new JsonArray();
+        monthArray.add("normalize_month");
+        saveActions.add("month", monthArray);
+        JsonObject expectedJson = new JsonObject();
+        expectedJson.add("saveActions", saveActions);
+        return expectedJson;
+    }
 }