Fix warning display issue for entering a title made of two words

CHANGELOG.md

@@ -56,6 +56,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - We fixed an issue where the group and the link column were not updated after changing the entry in the main table. [#5985](https://github.com/JabRef/jabref/issues/5985)
 - We fixed an issue where reordering the groups was not possible after inserting an article. [#6008](https://github.com/JabRef/jabref/issues/6008)
 - We fixed an issue where citation styles except the default "Preview" could not be used. [#56220](https://github.com/JabRef/jabref/issues/5622)
+- We fixed an issue where a warning was displayed when the title content is made up of two sentences. [#5832](https://github.com/JabRef/jabref/issues/5832)
 - We fixed an issue where an exception was thrown when adding a save action without a selected formatter in the library properties [#6069](https://github.com/JabRef/jabref/issues/6069)
 
 ### Removed

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

@@ -12,6 +12,7 @@
 public class TitleChecker implements ValueChecker {
 
     private static final Pattern INSIDE_CURLY_BRAKETS = Pattern.compile("\\{[^}\\{]*\\}");
+    private static final Pattern DELIMITERS = Pattern.compile("\\.|\\!|\\?|\\;|\\:");
     private static final Predicate<String> HAS_CAPITAL_LETTERS = Pattern.compile("[\\p{Lu}\\p{Lt}]").asPredicate();
 
     private final BibDatabaseContext databaseContext;
@@ -22,10 +23,13 @@ public TitleChecker(BibDatabaseContext databaseContext) {
 
     /**
      * Algorithm:
-     * - remove trailing whitespaces
-     * - ignore first letter as this can always be written in caps
      * - remove everything that is in brackets
-     * - check if at least one capital letter is in the title
+     * - split the title into sub titles based on the delimiters
+     * (defined in the local variable DELIMITERS, currently . ! ? ; :)
+     * - for each sub title:
+     * -    remove trailing whitespaces
+     * -    ignore first letter as this can always be written in caps
+     * -    check if at least one capital letter is in the sub title
      */
     @Override
     public Optional<String> checkValue(String value) {
@@ -37,9 +41,7 @@ public Optional<String> checkValue(String value) {
             return Optional.empty();
         }
 
-        String valueTrimmed = value.trim();
-        String valueIgnoringFirstLetter = valueTrimmed.startsWith("{") ? valueTrimmed : valueTrimmed.substring(1);
-        String valueOnlySpacesWithinCurlyBraces = valueIgnoringFirstLetter;
+        String valueOnlySpacesWithinCurlyBraces = value;
         while (true) {
             Matcher matcher = INSIDE_CURLY_BRAKETS.matcher(valueOnlySpacesWithinCurlyBraces);
             if (!matcher.find()) {
@@ -48,11 +50,15 @@ public Optional<String> checkValue(String value) {
             valueOnlySpacesWithinCurlyBraces = matcher.replaceAll("");
         }
 
-        boolean hasCapitalLettersThatBibtexWillConvertToSmallerOnes = HAS_CAPITAL_LETTERS
-                .test(valueOnlySpacesWithinCurlyBraces);
-
-        if (hasCapitalLettersThatBibtexWillConvertToSmallerOnes) {
-            return Optional.of(Localization.lang("capital letters are not masked using curly brackets {}"));
+        String[] splitTitle = DELIMITERS.split(valueOnlySpacesWithinCurlyBraces);
+        for (String subTitle : splitTitle) {
+            subTitle = subTitle.trim();
+            if (!subTitle.isEmpty()) {
+                subTitle = subTitle.substring(1);
+                if (HAS_CAPITAL_LETTERS.test(subTitle)) {
+                    return Optional.of(Localization.lang("capital letters are not masked using curly brackets {}"));
+                }
+            }
         }
 
         return Optional.empty();

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

@@ -186,6 +186,17 @@ void testTitleChecks() {
         assertCorrect(withMode(createContext(StandardField.TITLE, "This is a {Title}"), BibDatabaseMode.BIBTEX));
         assertCorrect(withMode(createContext(StandardField.TITLE, "{C}urrent {C}hronicle"), BibDatabaseMode.BIBTEX));
         assertCorrect(withMode(createContext(StandardField.TITLE, "{A Model-Driven Approach for Monitoring {ebBP} BusinessTransactions}"), BibDatabaseMode.BIBTEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1: This is a sub title 2"), BibDatabaseMode.BIBTEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1: this is a sub title 2"), BibDatabaseMode.BIBTEX));
+        assertWrong(withMode(createContext(StandardField.TITLE, "This is a sub title 1: This is A sub title 2"), BibDatabaseMode.BIBTEX));
+        assertWrong(withMode(createContext(StandardField.TITLE, "This is a sub title 1: this is A sub title 2"), BibDatabaseMode.BIBTEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1: This is {A} sub title 2"), BibDatabaseMode.BIBTEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1: this is {A} sub title 2"), BibDatabaseMode.BIBTEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1...This is a sub title 2"), BibDatabaseMode.BIBTEX));
+        assertWrong(withMode(createContext(StandardField.TITLE, "This is a sub title 1... this is a sub Title 2"), BibDatabaseMode.BIBTEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is; A sub title 1.... This is a sub title 2"), BibDatabaseMode.BIBTEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This!is!!A!Title??"), BibDatabaseMode.BIBTEX));
+        assertWrong(withMode(createContext(StandardField.TITLE, "This!is!!A!TitlE??"), BibDatabaseMode.BIBTEX));
 
         assertCorrect(withMode(createContext(StandardField.TITLE, "This is a title"), BibDatabaseMode.BIBLATEX));
         assertCorrect(withMode(createContext(StandardField.TITLE, "This is a Title"), BibDatabaseMode.BIBLATEX));
@@ -194,6 +205,17 @@ void testTitleChecks() {
         assertCorrect(withMode(createContext(StandardField.TITLE, "This is a {Title}"), BibDatabaseMode.BIBLATEX));
         assertCorrect(withMode(createContext(StandardField.TITLE, "{C}urrent {C}hronicle"), BibDatabaseMode.BIBLATEX));
         assertCorrect(withMode(createContext(StandardField.TITLE, "{A Model-Driven Approach for Monitoring {ebBP} BusinessTransactions}"), BibDatabaseMode.BIBLATEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1: This is a sub title 2"), BibDatabaseMode.BIBLATEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1: this is a sub title 2"), BibDatabaseMode.BIBLATEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1: This is A sub title 2"), BibDatabaseMode.BIBLATEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1: this is A sub title 2"), BibDatabaseMode.BIBLATEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1: This is {A} sub title 2"), BibDatabaseMode.BIBLATEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1: this is {A} sub title 2"), BibDatabaseMode.BIBLATEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1...This is a sub title 2"), BibDatabaseMode.BIBLATEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is a sub title 1... this is a sub Title 2"), BibDatabaseMode.BIBLATEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This is; A sub title 1.... This is a sub title 2"), BibDatabaseMode.BIBLATEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This!is!!A!Title??"), BibDatabaseMode.BIBLATEX));
+        assertCorrect(withMode(createContext(StandardField.TITLE, "This!is!!A!TitlE??"), BibDatabaseMode.BIBLATEX));
     }
 
     @Test

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

@@ -0,0 +1,79 @@
+package org.jabref.logic.integrity;
+
+import java.util.Optional;
+
+import org.jabref.model.database.BibDatabaseContext;
+import org.jabref.model.database.BibDatabaseMode;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+
+public class TitleCheckerTest {
+
+    private TitleChecker checker;
+
+    @BeforeEach
+    public void setUp() {
+        BibDatabaseContext databaseContext = new BibDatabaseContext();
+        databaseContext.setMode(BibDatabaseMode.BIBTEX);
+        checker = new TitleChecker(databaseContext);
+    }
+
+    @Test
+    public void FirstLetterAsOnlyCapitalLetterInSubTitle2() {
+        assertEquals(Optional.empty(), checker.checkValue("This is a sub title 1: This is a sub title 2"));
+    }
+
+    @Test
+    public void NoCapitalLetterInSubTitle2() {
+        assertEquals(Optional.empty(), checker.checkValue("This is a sub title 1: this is a sub title 2"));
+    }
+
+    @Test
+    public void TwoCapitalLettersInSubTitle2() {
+        assertNotEquals(Optional.empty(), checker.checkValue("This is a sub title 1: This is A sub title 2"));
+    }
+
+    @Test
+    public void MiddleLetterAsOnlyCapitalLetterInSubTitle2() {
+        assertNotEquals(Optional.empty(), checker.checkValue("This is a sub title 1: this is A sub title 2"));
+    }
+
+    @Test
+    public void TwoCapitalLettersInSubTitle2WithCurlyBrackets() {
+        assertEquals(Optional.empty(), checker.checkValue("This is a sub title 1: This is {A} sub title 2"));
+    }
+
+    @Test
+    public void MiddleLetterAsOnlyCapitalLetterInSubTitle2WithCurlyBrackets() {
+        assertEquals(Optional.empty(), checker.checkValue("This is a sub title 1: this is {A} sub title 2"));
+    }
+
+    @Test
+    public void FirstLetterAsOnlyCapitalLetterInSubTitle2AfterContinuousDelimiters() {
+        assertEquals(Optional.empty(), checker.checkValue("This is a sub title 1...This is a sub title 2"));
+    }
+
+    @Test
+    public void MiddleLetterAsOnlyCapitalLetterInSubTitle2AfterContinuousDelimiters() {
+        assertNotEquals(Optional.empty(), checker.checkValue("This is a sub title 1... this is a sub Title 2"));
+    }
+
+    @Test
+    public void FirstLetterAsOnlyCapitalLetterInEverySubTitleWithContinuousDelimiters() {
+        assertEquals(Optional.empty(), checker.checkValue("This is; A sub title 1.... This is a sub title 2"));
+    }
+
+    @Test
+    public void FirstLetterAsOnlyCapitalLetterInEverySubTitleWithRandomDelimiters() {
+        assertEquals(Optional.empty(), checker.checkValue("This!is!!A!Title??"));
+    }
+
+    @Test
+    public void MoreThanOneCapitalLetterInSubTitleWithoutCurlyBrackets() {
+        assertNotEquals(Optional.empty(), checker.checkValue("This!is!!A!TitlE??"));
+    }
+}