Fix parsing of clang warnings with "C/C++:" prefix

src/main/java/edu/hm/hafner/analysis/IssueBuilder.java

@@ -3,6 +3,7 @@
 import java.io.Serializable;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.nio.file.InvalidPathException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Optional;
@@ -623,8 +624,13 @@
         catch (URISyntaxException e) {
             // Catch and ignore as system paths are not URI and we need to check them separately.
         }
-        Path path = Paths.get(stringPath);
-        return path.isAbsolute();
+        try {
+            Path path = Paths.get(stringPath);
+            return path.isAbsolute();
+        }
+        catch (InvalidPathException e) {
+            return true;
+        }
     }
 
     private static String normalizeFileName(@CheckForNull final String platformFileName) {

src/main/java/edu/hm/hafner/analysis/parser/ClangParser.java

@@ -18,7 +18,7 @@
 public class ClangParser extends LookaheadParser {
     private static final long serialVersionUID = -3015592762345283182L;
 
-    private static final String CLANG_WARNING_PATTERN = "^\\s*(?:\\d+%)?([^%]*?):(\\d+):(?:(\\d+):)?" + "(?:"
+    private static final String CLANG_WARNING_PATTERN = "^\\s*(?:\\d+%)?(C\\/C\\+\\+: )?([^%]*?):(\\d+):(?:(\\d+):)?" + "(?:"
             + "(?:\\{\\d+:\\d+-\\d+:\\d+\\})+:)?\\s*(warning|[^\\[\\]]*error):" + "\\s*(.*?)(?:\\[([^\\[]*)\\])?$";
     private static final Pattern IGNORE_FORMAT = Pattern.compile("^-\\[.*\\].*$");
 
@@ -32,17 +32,17 @@ public ClangParser() {
     @Override
     protected Optional<Issue> createIssue(final Matcher matcher, final LookaheadStream lookahead,
             final IssueBuilder builder) {
-        String message = matcher.group(5);
+        String message = matcher.group(6);
         if (IGNORE_FORMAT.matcher(message).matches()) {
             return Optional.empty();
         }
 
-        return builder.setFileName(matcher.group(1))
-                .setLineStart(matcher.group(2))
-                .setColumnStart(matcher.group(3))
-                .setCategory(matcher.group(6))
+        return builder.setFileName(matcher.group(2))
+                .setLineStart(matcher.group(3))
+                .setColumnStart(matcher.group(4))
+                .setCategory(matcher.group(7))
                 .setMessage(message)
-                .setSeverity(mapPriority(matcher.group(4)))
+                .setSeverity(mapPriority(matcher.group(5)))
                 .buildOptional();
     }
 

src/test/java/edu/hm/hafner/analysis/parser/ClangParserTest.java

@@ -196,4 +196,38 @@ void issue14333() {
                     .hasSeverity(Severity.WARNING_NORMAL);
         }
     }
+
+    @Test
+    void assertThatClangPathsAreCorrectForAllPlatforms() {
+        Report warnings = parse("llvm-clang.txt");
+
+        assertThat(warnings).hasSize(3);
+
+        try (SoftAssertions softly = new SoftAssertions()) {
+            softly.assertThat(warnings.get(0)).hasLineStart(35)
+                    .hasLineEnd(35)
+                    .hasColumnStart(15)
+                    .hasColumnEnd(15)
+                    .hasMessage("unused parameter 'parameter1'")
+                    .hasFileName("/project/src/cpp/MyClass.cpp")
+                    .hasCategory("-Wunused-parameter")
+                    .hasSeverity(Severity.WARNING_NORMAL);
+            softly.assertThat(warnings.get(1)).hasLineStart(35)
+                    .hasLineEnd(35)
+                    .hasColumnStart(15)
+                    .hasColumnEnd(15)
+                    .hasMessage("unused parameter 'parameter1'")
+                    .hasFileName("C:/project/src/cpp/MyClass.cpp")
+                    .hasCategory("-Wunused-parameter")
+                    .hasSeverity(Severity.WARNING_NORMAL);
+            softly.assertThat(warnings.get(2)).hasLineStart(35)
+                    .hasLineEnd(35)
+                    .hasColumnStart(15)
+                    .hasColumnEnd(15)
+                    .hasMessage("unused parameter 'parameter1'")
+                    .hasFileName("MyClass.cpp")
+                    .hasCategory("-Wunused-parameter")
+                    .hasSeverity(Severity.WARNING_NORMAL);
+        }
+    }
 }

src/test/resources/edu/hm/hafner/analysis/parser/llvm-clang.txt

@@ -0,0 +1,5 @@
+C/C++: /project/src/cpp/MyClass.cpp:35:15: warning: unused parameter 'parameter1' [-Wunused-parameter]
+
+C/C++: C:\project\src\cpp\MyClass.cpp:35:15: warning: unused parameter 'parameter1' [-Wunused-parameter]
+
+C/C++: MyClass.cpp:35:15: warning: unused parameter 'parameter1' [-Wunused-parameter]