added more unit tests

Author: subyssurendran666

org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTConverterMarkdownTest.java

@@ -2014,4 +2014,42 @@ public class Markdown() {}
 			assertTrue(tagFragments.get(1) instanceof SimpleName);
 		}
 	}
+
+	// [)[) - invalid condition
+	public void testMarkdownURLs4531_06() throws JavaModelException {
+		String source = """
+				/// @see [Ex Si)[http://ex.com)
+				public class Markdown() {}
+				""";
+		this.workingCopies = new ICompilationUnit[1];
+		this.workingCopies[0] = getWorkingCopy("/Converter_25/src/markdown/gh3761/Markdown.java", source, null);
+		if (this.docCommentSupport.equals(JavaCore.ENABLED)) {
+			CompilationUnit compilUnit = (CompilationUnit) runConversion(this.workingCopies[0], true);
+			TypeDeclaration typedeclaration =  (TypeDeclaration) compilUnit.types().get(0);
+			Javadoc javadoc = typedeclaration.getJavadoc();
+			TagElement tags = (TagElement) javadoc.tags().get(0);
+			assertEquals("fragments count does not match", 3, tags.fragments().size());
+			assertTrue(tags.fragments().get(0) instanceof TextElement);
+			assertTrue(tags.fragments().get(1) instanceof TextElement);
+			assertTrue(tags.fragments().get(2) instanceof TagElement);
+		}
+	}
+
+	// (](] - invalid condition
+	public void testMarkdownURLs4531_07() throws JavaModelException {
+		String source = """
+				/// @see (Ex Si](http://ex.com]
+				public class Markdown() {}
+				""";
+		this.workingCopies = new ICompilationUnit[1];
+		this.workingCopies[0] = getWorkingCopy("/Converter_25/src/markdown/gh3761/Markdown.java", source, null);
+		if (this.docCommentSupport.equals(JavaCore.ENABLED)) {
+			CompilationUnit compilUnit = (CompilationUnit) runConversion(this.workingCopies[0], true);
+			TypeDeclaration typedeclaration =  (TypeDeclaration) compilUnit.types().get(0);
+			Javadoc javadoc = typedeclaration.getJavadoc();
+			TagElement tags = (TagElement) javadoc.tags().get(0);
+			assertEquals("fragments count does not match", 1, tags.fragments().size());
+			assertTrue(tags.fragments().get(0) instanceof TextElement);
+		}
+	}
 }

org.eclipse.jdt.core/dom/org/eclipse/jdt/core/dom/DocCommentParser.java

@@ -735,6 +735,10 @@ protected boolean parseMarkdownLinks(int previousPosition) throws InvalidInputEx
 					break;
 				case ')':
 				case ']':
+					if (this.source[start - 1] == '[' && currentChar == ')' &&
+						peekChar() == '[' && this.source[this.scanner.eofPosition-2] == ')') {
+						return false; //[)[) - invalid
+					}
 					if ((peekChar() == '[' ) || peekChar() == '(') {
 						tStart = start;
 						tEnd = this.index - 1;