Fix: Ignore "Math superscript (^) and subscript (_) characters are not allowed in text mode" error for citation key (#11948)

CHANGELOG.md

@@ -20,6 +20,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 - We fixed an issue where a bib file with UFF-8 charset was wrongly loaded with a different charset [forum#5369](https://discourse.jabref.org/t/jabref-5-15-opens-bib-files-with-shift-jis-encoding-instead-of-utf-8/5369/)
 - We fixed an issue where new entries were inserted in the middle of the table instead of at the end. [#12371](https://github.com/JabRef/jabref/pull/12371)
 - We fixed an issue where removing the sort from the table did not restore the original order. [#12371](https://github.com/JabRef/jabref/pull/12371)
+- We fixed an issue where citation keys containing superscript (`^`) and subscript (`_`) characters in text mode were incorrectly flagged by the integrity checker. [#12391](https://github.com/JabRef/jabref/pull/12391)
 
 ### Removed
 

src/main/java/org/jabref/logic/integrity/LatexIntegrityChecker.java

@@ -15,6 +15,7 @@
 import org.jabref.model.entry.BibEntry;
 import org.jabref.model.entry.field.Field;
 import org.jabref.model.entry.field.FieldFactory;
+import org.jabref.model.entry.field.InternalField;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -49,8 +50,6 @@ public class LatexIntegrityChecker implements EntryChecker {
         snugglePackage.addComplexCommand("textless", false, 0, TEXT_MODE_ONLY, null, null, null);
         snugglePackage.addComplexCommand("textbackslash", false, 0, TEXT_MODE_ONLY, null, null, null);
         snugglePackage.addComplexCommand("textbar", false, 0, TEXT_MODE_ONLY, null, null, null);
-        // ENGINE.getPackages().get(0).addComplexCommandOneArg()
-              // engine.getPackages().get(0).addComplexCommandOneArg("text", false, ALL_MODES,LR, StyleDeclarationInterpretation.NORMALSIZE, null, TextFlowContext.ALLOW_INLINE);
 
         SESSION = ENGINE.createSession();
         SESSION.getConfiguration().setFailingFast(true);
@@ -66,6 +65,9 @@ public List<IntegrityMessage> check(BibEntry entry) {
                     .flatMap(LatexIntegrityChecker::getUnescapedAmpersandsWithCount)
                     // Exclude all DOM building errors as this functionality is not used.
                     .filter(pair -> !pair.getValue().getErrorCode().getErrorGroup().equals(CoreErrorGroup.TDE))
+                    // Exclude TTEM03 error for citation key field
+                    .filter(pair -> !(pair.getValue().getErrorCode().equals(CoreErrorCode.TTEM03) && pair.getKey().equals(InternalField.KEY_FIELD)))
+                    // Exclude errors present in EXCLUDED_ERRORS set
                     .filter(pair -> !EXCLUDED_ERRORS.contains(pair.getValue().getErrorCode()))
                     .map(pair ->
                             new IntegrityMessage(errorMessageFormatHelper(pair.getValue().getErrorCode(), pair.getValue().getArguments()), entry, pair.getKey()))

src/test/java/org/jabref/logic/integrity/LatexIntegrityCheckerTest.java

@@ -5,6 +5,7 @@
 
 import org.jabref.model.entry.BibEntry;
 import org.jabref.model.entry.field.Field;
+import org.jabref.model.entry.field.InternalField;
 import org.jabref.model.entry.field.StandardField;
 import org.jabref.model.entry.field.UserSpecificCommentField;
 
@@ -300,10 +301,33 @@ private static Stream<Arguments> provideUnacceptedInputs() {
                 Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TFEM03), StandardField.TITLE, "$\\right)$"),
 
                 // TFEM04: \left had no following \right
-                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TFEM04), StandardField.TITLE, "$\\left($")
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TFEM04), StandardField.TITLE, "$\\left($"),
 
                 // TFETB0: \hline must be the only token in table row
                 // Skipped
+
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TTEM03), StandardField.TITLE, "Title with ^ and _ characters"),
+                // Ensure invalid LaTeX syntax with special characters in other fields is detected
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TTEM03), StandardField.AUTHOR, "Author_Name"),
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TTEM03), StandardField.JOURNAL, "Journal_Name"),
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TTEM03), StandardField.BOOKTITLE, "Book^Title"),
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TTEM03), StandardField.NOTE, "Note_with_subscript_and_superscript^_")
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("provideCitationKeyInputs")
+    void testCitationKeyField(String expectedMessage, Field field, String value) {
+        entry.setField(field, value);
+        // Ensure TTEM03 error is not raised for citation key field
+        assertEquals(List.of(), checker.check(entry));
+    }
+
+    private static Stream<Arguments> provideCitationKeyInputs() {
+        return Stream.of(
+                Arguments.of("", InternalField.KEY_FIELD, "Corti_2009"),
+                Arguments.of("", InternalField.KEY_FIELD, "Key_With^Superscript"),
+                Arguments.of("", InternalField.KEY_FIELD, "Key_With_Subscript")
         );
     }
 }