perlcodescanner.java

<Apress.The.Definitive.Guide.to.SWT.and.JFace.eBook-LiB>书籍配套源代码

package examples.ch18.perledit.source;

import java.util.*;

import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.rules.*;
import org.eclipse.swt.SWT;

import examples.ch18.perledit.PerlEditor;

/**
 * This class scans through a code partition and colors it.
 */
public class PerlCodeScanner extends RuleBasedScanner {
  /**
   * PerlCodeScanner constructor
   */
  public PerlCodeScanner() {
    // Get the color manager
    ColorManager cm = PerlEditor.getApp().getColorManager();

    // Create the tokens for keywords, strings, and other (everything else)
    IToken keyword = new Token(
      new TextAttribute(cm.getColor(ColorManager.KEYWORD), 
      cm.getColor(ColorManager.BACKGROUND), SWT.BOLD));
    IToken other = new Token(
      new TextAttribute(cm.getColor(ColorManager.DEFAULT)));
    IToken string = new Token(
      new TextAttribute(cm.getColor(ColorManager.STRING)));

    // Use "other" for default
    setDefaultReturnToken(other);

    // Create the rules
    List rules = new ArrayList();
    
    // Add rules for strings
    rules.add(new SingleLineRule("\"", "\"", string, '\\'));
    rules.add(new SingleLineRule("'", "'", string, '\\'));
    
    // Add rule for whitespace
    rules.add(new WhitespaceRule(new IWhitespaceDetector() {
      public boolean isWhitespace(char c) {
        return Character.isWhitespace(c);
      }
    }));

    // Add rule for keywords, and add the words to the rule
    WordRule wordRule = new WordRule(new PerlWordDetector(), other);
    for (int i = 0, n = PerlSyntax.KEYWORDS.length; i < n; i++)
      wordRule.addWord(PerlSyntax.KEYWORDS[i], keyword);
    rules.add(wordRule);

    IRule[] result = new IRule[rules.size()];
    rules.toArray(result);
    setRules(result);
  }
}