Examples of org.eclipse.jface.text.ILineTracker

org.eclipse.jface.text.ILineTracker
A line tracker maps character positions to line numbers and vice versa. Initially the line tracker is informed about its underlying text in order to initialize the mapping information. After that, the line tracker is informed about all changes of the underlying text allowing for incremental updates of the mapping information. It is the client's responsibility to actively inform the line tacker about text changes. For example, when using a line tracker in combination with a document the document controls the line tracker.
In order to provide backward compatibility for clients of ILineTracker, extension interfaces are used to provide a means of evolution. The following extension interfaces exist:
- {@link org.eclipse.jface.text.ILineTrackerExtension} since version 3.1 introducing the conceptof rewrite sessions.
Clients may implement this interface or use the standard implementation
{@link org.eclipse.jface.text.DefaultLineTracker}or {@link org.eclipse.jface.text.ConfigurableLineTracker}.

    if (tabWidth < 0 || indentWidth <= 0 || code == null || indentUnitsToRemove < 0 || newIndentString == null || lineDelim == null) {
      throw new IllegalArgumentException();
    }
    
    try {
      ILineTracker tracker= new DefaultLineTracker();
      tracker.set(code);
      int nLines= tracker.getNumberOfLines();
      if (nLines == 1) {
        return code;
      }
      
      StringBuffer buf= new StringBuffer();
      
      for (int i= 0; i < nLines; i++) {
        IRegion region= tracker.getLineInformation(i);
        int start= region.getOffset();
        int end= start + region.getLength();
        String line= code.substring(start, end);
        
        if (i == 0) {  // no indent for first line (contained in the formatted string)

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   * @return the preprocessed code snippet
   */
  private String preprocessCodeSnippet(String snippet) {
    // strip content prefix
    StringBuffer buffer= new StringBuffer();
    ILineTracker tracker= new DefaultLineTracker();
    String contentPrefix= MultiCommentLine.MULTI_COMMENT_CONTENT_PREFIX.trim();
    
    buffer.setLength(0);
    buffer.append(snippet);
    tracker.set(snippet);
    for (int line= tracker.getNumberOfLines() - 1; line > 0; line--) {
      int lineOffset;
      try {
        lineOffset= tracker.getLineOffset(line);
      } catch (BadLocationException e) {
        // Can not happen
        CommentFormatterUtil.log(e);
        return snippet;
      }

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   * @return the postprocessed code snippet
   */
  private String postprocessCodeSnippet(String snippet, String indentation) {
    // patch content prefix
    StringBuffer buffer= new StringBuffer();
    ILineTracker tracker= new DefaultLineTracker();
    String patch= indentation + MultiCommentLine.MULTI_COMMENT_CONTENT_PREFIX;


    // remove trailing spaces
    int i= snippet.length();
    while (i > 0 && ' ' == snippet.charAt(i-1))
      i--;
    snippet= snippet.substring(0, i);
    
    buffer.setLength(0);
    String lineDelimiter= getDelimiter();
    if (lineDelimiter != null && snippet.indexOf(lineDelimiter) != 0)
      buffer.append(lineDelimiter);
    buffer.append(convertJava2Html(snippet));
    if (lineDelimiter != null && snippet.lastIndexOf(lineDelimiter) != snippet.length() - lineDelimiter.length())
      buffer.append(lineDelimiter);
    tracker.set(buffer.toString());
    
    for (int line= tracker.getNumberOfLines() - 1; line > 0; line--)
      try {
        buffer.insert(tracker.getLineOffset(line), patch);
      } catch (BadLocationException e) {
        // Can not happen
        CommentFormatterUtil.log(e);
        return snippet;
      }

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      throw new IllegalArgumentException();
    }
    
    ArrayList result= new ArrayList();
    try {
      ILineTracker tracker= new DefaultLineTracker();
      tracker.set(source);
      int nLines= tracker.getNumberOfLines();
      if (nLines == 1)
        return (ReplaceEdit[])result.toArray(new ReplaceEdit[result.size()]);
      for (int i= 1; i < nLines; i++) {
        IRegion region= tracker.getLineInformation(i);
        int offset= region.getOffset();
        String line= source.substring(offset, offset + region.getLength());
        int length= indexOfIndent(line, indentUnitsToRemove, tabWidth, indentWidth);
        if (length >= 0) {
          result.add(new ReplaceEdit(offset, length, newIndentString));

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    fTabSize= DefaultCodeFormatterOptions.SPACE == this.preferences.tab_char ? this.preferences.indentation_size : this.preferences.tab_size;


    this.scribe = formatter.scribe;


    final ILineTracker tracker= new DefaultLineTracker();


    IRegion range= null;
    CommentLine line= null;


    tracker.set(getText(0, getLength()));
    final int lines= tracker.getNumberOfLines();


    fSingleLine= lines == 1;


    try {


      for (int index= 0; index < lines; index++) {


        range= tracker.getLineInformation(index);
        line= createLine();
        line.append(new CommentRange(range.getOffset(), range.getLength()));


        fLines.add(line);
      }

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   *  region lies outside the source. 
   */
  public String[] convertIntoLines(int offset, int length, boolean lastNewLineCreateEmptyLine) {
    try {
      String text= fDocument.get(offset, length);
      ILineTracker tracker= new DefaultLineTracker();
      tracker.set(text);
      int size= tracker.getNumberOfLines();
      int lastLine= size - 1;
      List result= new ArrayList(size);
      for (int i= 0; i < size; i++) {
        IRegion region= tracker.getLineInformation(i);
        String line= getContent(offset + region.getOffset(), region.getLength());
        if (i < lastLine || !"".equals(line) || lastNewLineCreateEmptyLine) //$NON-NLS-1$
          result.add(line);
      }
      return (String[]) result.toArray(new String[result.size()]);

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   * @return the string converted into an array of strings. Returns <code>
   *   null</code> if the input string can't be converted in an array of lines.
   */
  public static String[] convertIntoLines(String input) {
    try {
      ILineTracker tracker= new DefaultLineTracker();
      tracker.set(input);
      int size= tracker.getNumberOfLines();
      String result[]= new String[size];
      for (int i= 0; i < size; i++) {
        IRegion region= tracker.getLineInformation(i);
        int offset= region.getOffset();
        result[i]= input.substring(offset, offset + region.getLength());
      }
      return result;
    } catch (BadLocationException e) {

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        lineOffset = command.offset - lineInfo.getOffset();
      } catch (BadLocationException e) {
        Logger.log(Logger.WARNING_DEBUG, e.getMessage(), e);
      }


      ILineTracker lineTracker = getLineTracker(document, originalText);


      int startIndex = 0;
      int index = newText.indexOf(TAB_CHARACTER);
      while (index != -1) {
        String indent = getIndentString(indentationWidth, lineOffset, lineTracker, index);


        // replace \t character with spaces
        newText.replace(index, index + 1, indent);
        if (lineTracker != null) {
          try {
            lineTracker.replace(index, 1, indent);
          } catch (BadLocationException e) {
            // if something goes wrong with replacing text, just
            // reset to current string
            lineTracker.set(newText.toString());
            Logger.log(Logger.WARNING_DEBUG, e.getMessage(), e);
          }
        }


        startIndex = index + indent.length();

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      }
      catch (BadLocationException e) {
        Logger.log(Logger.WARNING_DEBUG, e.getMessage(), e);
      }


      ILineTracker lineTracker = getLineTracker(document, originalText);


      int startIndex = 0;
      int index = newText.indexOf(TAB_CHARACTER);
      while (index != -1) {
        String indent = getIndentString(indentationWidth, lineOffset, lineTracker, index);


        // replace \t character with spaces
        newText.replace(index, index + 1, indent);
        if (lineTracker != null) {
          try {
            lineTracker.replace(index, 1, indent);
          }
          catch (BadLocationException e) {
            // if something goes wrong with replacing text, just
            // reset to current string
            lineTracker.set(newText.toString());
            Logger.log(Logger.WARNING_DEBUG, e.getMessage(), e);
          }
        }


        startIndex = index + indent.length();

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      }
    }
  
    // 4 - add the content prefix (@see JavaDocRegion#postprocessCodeSnippet)
    this.codeSnippetBuffer.setLength(0);
    ILineTracker tracker = new DefaultLineTracker();
    this.column = 1;
    printIndentationIfNecessary(this.codeSnippetBuffer); // append indentation
    this.codeSnippetBuffer.append(BLOCK_LINE_PREFIX);
    String linePrefix = this.codeSnippetBuffer.toString();
    this.codeSnippetBuffer.setLength(0);
    String replacement = formattedSnippet;
    tracker.set(formattedSnippet);
    int numberOfLines = tracker.getNumberOfLines();
    if (numberOfLines > 1) {
      int lastLineOffset = -1;
      for (int i=0; i<numberOfLines-1; i++) {
        if (i>0) this.codeSnippetBuffer.append(linePrefix);
        try {
          lastLineOffset = tracker.getLineOffset(i+1);
          this.codeSnippetBuffer.append(formattedSnippet.substring(tracker.getLineOffset(i), lastLineOffset));
        } catch (BadLocationException e) {
          // should not happen
          CommentFormatterUtil.log(e);
          return;
        }

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