package com.puppycrawl.tools.checkstyle.gui;
   
   import com.puppycrawl.tools.checkstyle.api.DetailAST;
   import java.awt.Color;
   import java.util.List;
   import javax.swing.JTextArea;
   
   public class CodeSelector
   {
      private final DetailAST ast;
      private final JTextArea editor;
      private final List<Integer> lines2position;
  
      public CodeSelector(final DetailAST ast, final JTextArea editor,
                          final List<Integer> lines2position)
      {
          this.ast = ast;
          this.editor = editor;
          this.lines2position = lines2position;
      }
  
      public void select() {
          int start = lines2position.get(ast.getLineNo()) + ast.getColumnNo();
          int end = findLastPosition(ast);
  
          editor.setSelectedTextColor(Color.blue);
          editor.requestFocusInWindow();
          editor.setSelectionStart(start);
          editor.setSelectionEnd(end);
          editor.transferFocusBackward();
      }
  
      private int findLastPosition(final DetailAST ast)
      {
          if (ast.getChildCount() == 0)
          {
              return lines2position.get(ast.getLineNo()) + ast.getColumnNo()
                  + ast.getText().length();
          }
          else
          {
              return findLastPosition(ast.getLastChild());
          }
      }
  }