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JMockit Coverage is a code coverage tool with several metrics (line, path, data) capable of generating HTML reports. It is designed with ease of use in mind, avoiding the need for complex configuration. Instead, smart (but overridable) defaults are employed, such as the selection of which classes to consider for coverage, and where to find sources files for report generation.

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/*
 * Copyright (c) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.coverage.reporting.parsing;

import java.util.*;

import org.jetbrains.annotations.*;

public final class FileParser
{
   private static final class PendingClass
   {
      @NotNull final String className;
      int braceBalance;
      PendingClass(@NotNull String className) { this.className = className; }
   }

   @NotNull public final LineParser lineParser = new LineParser();
   @NotNull public final List currentClasses = new ArrayList(2);

   @Nullable private PendingClass currentClass;
   private boolean openingBraceForClassFound;
   private int currentBraceBalance;

   public boolean parseCurrentLine(@NotNull String line)
   {
      if (!lineParser.parse(line)) {
         return false;
      }

      LineElement firstElement = lineParser.getInitialElement();
      LineElement classDeclaration = findClassNameInNewClassDeclaration();

      if (classDeclaration != null) {
         firstElement = classDeclaration;
         registerStartOfClassDeclaration(classDeclaration);
      }

      if (currentClass != null) {
         detectPotentialEndOfClassDeclaration(firstElement);
      }

      return true;
   }

   @Nullable private LineElement findClassNameInNewClassDeclaration()
   {
      LineElement previous = null;

      for (LineElement element : lineParser.getInitialElement()) {
         if (element.isKeyword("class") && (previous == null || !previous.isDotSeparator())) {
            return element.getNextCodeElement();
         }

         previous = element;
      }

      return null;
   }

   private void registerStartOfClassDeclaration(@NotNull LineElement elementWithClassName)
   {
      String className = elementWithClassName.getText();

      if (currentClass != null) {
         currentClass.braceBalance = currentBraceBalance;
      }

      currentClass = new PendingClass(className);
      currentClasses.add(currentClass);
      currentBraceBalance = 0;
   }

   private void detectPotentialEndOfClassDeclaration(@NotNull LineElement firstElement)
   {
      // TODO: how to deal with classes defined entirely in one line?
      currentBraceBalance += firstElement.getBraceBalanceUntilEndOfLine();

      if (!openingBraceForClassFound && currentBraceBalance > 0) {
         openingBraceForClassFound = true;
      }
      else if (openingBraceForClassFound && currentBraceBalance == 0) {
         restorePreviousPendingClassIfAny();
      }
   }

   private void restorePreviousPendingClassIfAny()
   {
      currentClasses.remove(currentClass);

      if (currentClasses.isEmpty()) {
         currentClass = null;
      }
      else {
         currentClass = currentClasses.get(currentClasses.size() - 1);
         currentBraceBalance = currentClass.braceBalance;
      }
   }

   @Nullable public String getCurrentlyPendingClass()
   {
      return currentClass == null ? null : currentClass.className;
   }
}