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;
}
}
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