Implements syntax coloring using the StyledText API : StyledText « SWT JFace Eclipse « Java





Implements syntax coloring using the StyledText API

Implements syntax coloring using the StyledText API

//Send questions, comments, bug reports, etc. to the authors:

//Rob Warner (rwarner@interspatial.com)
//Robert Harris (rbrt_harris@yahoo.com)
import java.util.*;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

/**
 * This class implements syntax coloring using the StyledText API
 */
public class SyntaxTest {
  // Punctuation
  private static final String PUNCTUATION = "(){};!&|.+-*/";

  // Color for the StyleRanges
  private Color red;

  /**
   * Runs the application
   */
  public void run() {
    Display display = new Display();
    Shell shell = new Shell(display);

    // Get color for style ranges
    red = display.getSystemColor(SWT.COLOR_RED);

    createContents(shell);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }

    // No need to dispose red

    display.dispose();
  }

  /**
   * Creates the main window contents
   * 
   * @param shell the main window
   */
  private void createContents(Shell shell) {
    shell.setLayout(new FillLayout());

    // Create the StyledText
    final StyledText styledText = new StyledText(shell, SWT.BORDER);

    // Add the syntax coloring handler
    styledText.addExtendedModifyListener(new ExtendedModifyListener() {
      public void modifyText(ExtendedModifyEvent event) {
        // Determine the ending offset
        int end = event.start + event.length - 1;

        // If they typed something, get it
        if (event.start <= end) {
          // Get the text
          String text = styledText.getText(event.start, end);

          // Create a collection to hold the StyleRanges
          java.util.List ranges = new java.util.ArrayList();

          // Turn any punctuation red
          for (int i = 0, n = text.length(); i < n; i++) {
            if (PUNCTUATION.indexOf(text.charAt(i)) > -1) {
              ranges.add(new StyleRange(event.start + i, 1, red, null, SWT.BOLD));
            }
          }

          // If we have any ranges to set, set them
          if (!ranges.isEmpty()) {
            styledText.replaceStyleRanges(event.start, event.length,
                (StyleRange[]) ranges.toArray(new StyleRange[0]));
          }
        }
      }
    });
  }

  /**
   * The application entry point
   * 
   * @param args the command line arguments
   */
  public static void main(String[] args) {
    new SyntaxTest().run();
  }
}
//Send questions, comments, bug reports, etc. to the authors:

//Rob Warner (rwarner@interspatial.com)
//Robert Harris (rbrt_harris@yahoo.com)

/**
 * This class contains information for syntax coloring and styling for an
 * extension
 */
class SyntaxData {
  private String extension;
  private Collection keywords;
  private String punctuation;
  private String comment;
  private String multiLineCommentStart;
  private String multiLineCommentEnd;

  /**
   * Constructs a SyntaxData
   * 
   * @param extension the extension
   */
  public SyntaxData(String extension) {
    this.extension = extension;
  }

  /**
   * Gets the extension
   * 
   * @return String
   */
  public String getExtension() {
    return extension;
  }

  /**
   * Gets the comment
   * 
   * @return String
   */
  public String getComment() {
    return comment;
  }

  /**
   * Sets the comment
   * 
   * @param comment The comment to set.
   */
  public void setComment(String comment) {
    this.comment = comment;
  }

  /**
   * Gets the keywords
   * 
   * @return Collection
   */
  public Collection getKeywords() {
    return keywords;
  }

  /**
   * Sets the keywords
   * 
   * @param keywords The keywords to set.
   */
  public void setKeywords(Collection keywords) {
    this.keywords = keywords;
  }

  /**
   * Gets the multi-line comment end
   * 
   * @return String
   */
  public String getMultiLineCommentEnd() {
    return multiLineCommentEnd;
  }

  /**
   * Sets the multi-line comment end
   * 
   * @param multiLineCommentEnd The multiLineCommentEnd to set.
   */
  public void setMultiLineCommentEnd(String multiLineCommentEnd) {
    this.multiLineCommentEnd = multiLineCommentEnd;
  }

  /**
   * Gets the multi-line comment start
   * 
   * @return String
   */
  public String getMultiLineCommentStart() {
    return multiLineCommentStart;
  }

  /**
   * Sets the multi-line comment start
   * 
   * @param multiLineCommentStart The multiLineCommentStart to set.
   */
  public void setMultiLineCommentStart(String multiLineCommentStart) {
    this.multiLineCommentStart = multiLineCommentStart;
  }

  /**
   * Gets the punctuation
   * 
   * @return String
   */
  public String getPunctuation() {
    return punctuation;
  }

  /**
   * Sets the punctuation
   * 
   * @param punctuation The punctuation to set.
   */
  public void setPunctuation(String punctuation) {
    this.punctuation = punctuation;
  }
}
//Send questions, comments, bug reports, etc. to the authors:

//Rob Warner (rwarner@interspatial.com)
//Robert Harris (rbrt_harris@yahoo.com)

/**
 * This class manages the syntax coloring and styling data
 */
class SyntaxManager {
  // Lazy cache of SyntaxData objects
  private static Map data = new Hashtable();

  /**
   * Gets the syntax data for an extension
   */
  public static synchronized SyntaxData getSyntaxData(String extension) {
    // Check in cache
    SyntaxData sd = (SyntaxData) data.get(extension);
    if (sd == null) {
      // Not in cache; load it and put in cache
      sd = loadSyntaxData(extension);
      if (sd != null) data.put(sd.getExtension(), sd);
    }
    return sd;
  }

  /**
   * Loads the syntax data for an extension
   * 
   * @param extension the extension to load
   * @return SyntaxData
   */
  private static SyntaxData loadSyntaxData(String extension) {
    SyntaxData sd = null;
    try {
      ResourceBundle rb = ResourceBundle.getBundle("examples.ch11." + extension);
      sd = new SyntaxData(extension);
      sd.setComment(rb.getString("comment"));
      sd.setMultiLineCommentStart(rb.getString("multilinecommentstart"));
      sd.setMultiLineCommentEnd(rb.getString("multilinecommentend"));

      // Load the keywords
      Collection keywords = new ArrayList();
      for (StringTokenizer st = new StringTokenizer(rb.getString("keywords"), " "); st
          .hasMoreTokens();) {
        keywords.add(st.nextToken());
      }
      sd.setKeywords(keywords);

      // Load the punctuation
      sd.setPunctuation(rb.getString("punctuation"));
    } catch (MissingResourceException e) {
      // Ignore
    }
    return sd;
  }
}


           
       










Related examples in the same category

1.Sample Styled TextSample Styled Text
2.Styled Text with highlighted Odd LineStyled Text with highlighted Odd Line
3.Search Style TextSearch Style Text
4.SetLine Background SetLine Background
5.Demonstrates StyleRangesDemonstrates StyleRanges
6.SWT StyledText
7.Text with underline and strike throughText with underline and strike through
8.Setting the font style, foreground and background colors of StyledTextSetting the font style, foreground and background colors of StyledText