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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.parsing;

import javax.annotation.*;

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

/**
 * Parses a source line into one or more consecutive segments, identifying which ones contain Java code and which ones
 * contain only comments.
 * Block comments initiated in a previous line are kept track of until the end of the block is reached.
 */
public final class LineParser
{
   private static final String SEPARATORS = ".,;()";

   private int lineNum;
   @Nonnull private String line;
   @Nullable private LineElement initialElement;
   private boolean inComments;

   // Helper fields:
   @Nullable private LineElement currentElement;
   private int lineLength;
   private int startPos;
   private boolean inCodeElement;
   private int pos;
   private int currChar;

   public int getNumber() { return lineNum; }

   public boolean isInComments() { return inComments; }

   public boolean isBlankLine()
   {
      int n = line.length();

      for (int i = 0; i < n; i++) {
         char c = line.charAt(i);

         if (!Character.isWhitespace(c)) {
            return false;
         }
      }

      return true;
   }

   @Nonnull public LineElement getInitialElement() { assert initialElement != null; return initialElement; }

   boolean parse(@Nonnull String lineToParse)
   {
      lineNum++;
      initialElement = null;
      currentElement = null;
      line = lineToParse;
      lineLength = lineToParse.length();
      startPos = inComments ? 0 : -1;
      inCodeElement = false;

      for (pos = 0; pos < lineLength; pos++) {
         currChar = lineToParse.codePointAt(pos);

         if (parseComment()) {
            break;
         }

         parseSeparatorsAndCode();
      }

      if (startPos >= 0) {
         addFinalElement();
      }
      else if (initialElement == null) {
         initialElement = new LineElement(ElementType.SEPARATOR, "");
         return false;
      }

      return !inComments && !isBlankLine();
   }

   private void parseSeparatorsAndCode()
   {
      boolean separator = isSeparator();

      if (separator && !inCodeElement) {
         startNewElementIfNotYetStarted();
      }
      else if (!separator && !inCodeElement) {
         if (startPos >= 0) {
            addElement();
         }

         inCodeElement = true;
         startPos = pos;
      }
      else if (separator) {
         addElement();
         inCodeElement = false;
         startPos = pos;
      }
   }

   private boolean isSeparator()
   {
      return Character.isWhitespace(currChar) || SEPARATORS.indexOf(currChar) >= 0;
   }

   private void startNewElementIfNotYetStarted()
   {
      if (startPos < 0) {
         startPos = pos;
      }
   }

   private boolean parseComment()
   {
      if (inComments && parseUntilEndOfLineOrEndOfComment()) {
         return true;
      }

      while (currChar == '/' && pos < lineLength - 1) {
         int c2 = line.codePointAt(pos + 1);

         if (c2 == '/') {
            endCodeElementIfPending();
            startNewElementIfNotYetStarted();
            inComments = true;
            addFinalElement();
            inComments = false;
            startPos = -1;
            return true;
         }
         else if (c2 == '*') {
            endCodeElementIfPending();
            startNewElementIfNotYetStarted();
            inComments = true;
            pos += 2;

            if (parseUntilEndOfLineOrEndOfComment()) {
               return true;
            }
         }
         else {
            break;
         }
      }

      return false;
   }

   private void endCodeElementIfPending()
   {
      if (inCodeElement) {
         addElement();
         startPos = pos;
         inCodeElement = false;
      }
   }

   private boolean parseUntilEndOfLineOrEndOfComment()
   {
      while (pos < lineLength) {
         currChar = line.codePointAt(pos);

         if (currChar == '*' && pos < lineLength - 1 && line.codePointAt(pos + 1) == '/') {
            pos += 2;
            addElement();
            startPos = -1;
            inComments = false;
            break;
         }

         pos++;
      }

      if (pos < lineLength) {
         currChar = line.codePointAt(pos);
         return false;
      }
      else {
         return true;
      }
   }

   private void addFinalElement()
   {
      String text = line.substring(startPos);
      addElement(text);
   }

   private void addElement()
   {
      String text = pos > 0 ? line.substring(startPos, pos) : line.substring(startPos);
      addElement(text);
   }

   private void addElement(@Nonnull String text)
   {
      ElementType type;

      if (inComments) {
         type = ElementType.COMMENT;
      }
      else if (inCodeElement) {
         type = ElementType.CODE;
      }
      else {
         type = ElementType.SEPARATOR;
      }

      LineElement newElement = new LineElement(type, text);

      if (initialElement == null) {
         initialElement = newElement;
      }
      else {
         assert currentElement != null;
         currentElement.setNext(newElement);
      }

      currentElement = newElement;
   }
}