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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) 2006-2015 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.coverage.reporting.lineCoverage;

import java.util.*;
import static java.lang.Character.*;

import mockit.coverage.*;
import mockit.coverage.lines.*;
import mockit.coverage.reporting.*;
import mockit.coverage.reporting.parsing.*;

import org.jetbrains.annotations.*;

final class LineSegmentsFormatter
{
   @Nullable private final ListOfCallPoints listOfCallPoints;
   @NotNull private final StringBuilder formattedLine;

   // Helper fields:
   private int lineNumber;
   private int segmentIndex;
   private LineSegmentData segmentData;
   @Nullable private LineElement element;

   LineSegmentsFormatter(boolean withCallPoints, @NotNull StringBuilder formattedLine)
   {
      listOfCallPoints = withCallPoints ? new ListOfCallPoints() : null;
      this.formattedLine = formattedLine;
   }

   void formatSegments(@NotNull LineParser lineParser, @NotNull LineCoverageData lineData)
   {
      lineNumber = lineParser.getNumber();

      List branchData = lineData.getBranches();
      int numSegments = lineData.getNumberOfSegments();

      element = lineParser.getInitialElement().appendUntilNextCodeElement(formattedLine);

      segmentIndex = 0;
      segmentData = lineData;
      appendUntilNextBranchingPoint();

      while (element != null && segmentIndex < numSegments) {
         segmentData = segmentIndex == 0 ? lineData : branchData.get(segmentIndex - 1);
         element = element.appendUntilNextCodeElement(formattedLine);
         appendUntilNextBranchingPoint();
      }

      if (element != null) {
         element.appendAllBefore(formattedLine, null);
      }

      formattedLine.append("

");

      if (listOfCallPoints != null) {
         formattedLine.append(listOfCallPoints.getContents());
      }
   }

   private void appendUntilNextBranchingPoint()
   {
      if (element != null) {
         LineElement firstElement = element;
         element = element.findNextBranchingPoint();

         appendToFormattedLine(firstElement);

         if (element != null && element.isBranchingElement()) {
            formattedLine.append(element.getText());
            element = element.getNext();
         }
      }
   }

   private void appendToFormattedLine(@NotNull LineElement firstElement)
   {
      if (firstElement != element) {
         appendStartTag();
         firstElement.appendAllBefore(formattedLine, element);
         appendEndTag();

         segmentIndex++;
      }
   }

   private void appendStartTag()
   {
      formattedLine.append("");
         }
         else {
            formattedLine.append("class='covered'>");
         }
      }
      else {
         formattedLine.append("class='uncovered'>");
      }
   }

   private void appendEndTag()
   {
      int i = formattedLine.length() - 1;

      while (isWhitespace(formattedLine.charAt(i))) {
         i--;
      }

      formattedLine.insert(i + 1, "");

      if (listOfCallPoints != null) {
         List callPoints = segmentData.getCallPoints();
         listOfCallPoints.insertListOfCallPoints(callPoints);
      }
   }
}