StringLiteralExpr.java

/* 
  Copyright (C) 2013 Raquel Pau and Albert Coroleu.
 
 Walkmod is free software: you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
 Walkmod is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.
 
 You should have received a copy of the GNU Lesser General Public License
 along with Walkmod.  If not, see <http://www.gnu.org/licenses/>.*/

package org.walkmod.javalang.ast.expr;

import org.walkmod.javalang.ast.Node;
import org.walkmod.javalang.visitors.GenericVisitor;
import org.walkmod.javalang.visitors.VoidVisitor;

/**
 * @author Julio Vilmar Gesser
 */
public class StringLiteralExpr extends LiteralExpr {

   protected String value;

   public StringLiteralExpr() {
   }

   public StringLiteralExpr(String value) {
      this.value = escape(value);
   }

   public StringLiteralExpr(int beginLine, int beginColumn, int endLine, int endColumn, String value) {
      super(beginLine, beginColumn, endLine, endColumn);
      this.value = escape(value);
   }

   @Override
   public <R, A> R accept(GenericVisitor<R, A> v, A arg) {
      if (!check()) {
         return null;
      }
      return v.visit(this, arg);
   }

   @Override
   public <A> void accept(VoidVisitor<A> v, A arg) {
      if (check()) {
         v.visit(this, arg);
      }
   }

   public final String getValue() {
      return value;
   }

   public final void setValue(String value) {
      this.value = escape(value);
   }

   private static String escape(String str) {
      if (str == null) {
         return null;
      }
      int sz;
      sz = str.length();
      StringBuffer out = new StringBuffer();
      for (int i = 0; i < sz; i++) {
         char ch = str.charAt(i);
         // handle unicode

         if (ch > 0xfff) {
            out.append("\\u" + hex(ch));
         } else if (ch > 0xff) {
            out.append("\\u0" + hex(ch));
         } else if (ch > 0x7f) {
            out.append("\\u00" + hex(ch));
         } else if (ch < 32) {
            switch (ch) {
            case '\b':
            case '\n':
            case '\t':
            case '\f':
            case '\r':
               out.append(ch);
               break;
            default:
               if (ch > 0xf) {
                  out.append("\\u00" + hex(ch));
               } else {
                  out.append("\\u000" + hex(ch));
               }
               break;
            }
         } else {
            out.append(ch);
         }
      }
      return out.toString();
   }

   private static String hex(char ch) {
      return Integer.toHexString(ch).toUpperCase();
   }

   @Override
   public boolean replaceChildNode(Node oldChild, Node newChild) {
      return false;
   }

   @Override
   public StringLiteralExpr clone() throws CloneNotSupportedException {
      return new StringLiteralExpr(value);
   }

}