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/*
 * #%L
 * The AIBench Shell Plugin
 * %%
 * Copyright (C) 2006 - 2017 Daniel Glez-Peña and Florentino Fdez-Riverola
 * %%
 * This program 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.
 * 
 * This program 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 General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */
/*****************************************************************************
 *                                                                           *
 *  This file is part of the BeanShell Java Scripting distribution.          *
 *  Documentation and updates may be found at http://www.beanshell.org/      *
 *                                                                           *
 *  Sun Public License Notice:                                               *
 *                                                                           *
 *  The contents of this file are subject to the Sun Public License Version  *
 *  1.0 (the "License"); you may not use this file except in compliance with *
 *  the License. A copy of the License is available at http://www.sun.com    * 
 *                                                                           *
 *  The Original Code is BeanShell. The Initial Developer of the Original    *
 *  Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright     *
 *  (C) 2000.  All Rights Reserved.                                          *
 *                                                                           *
 *  GNU Public License Notice:                                               *
 *                                                                           *
 *  Alternatively, the contents of this file may be used under the terms of  *
 *  the GNU Lesser General Public License (the "LGPL"), in which case the    *
 *  provisions of LGPL are applicable instead of those above. If you wish to *
 *  allow use of your version of this file only under the  terms of the LGPL *
 *  and not to allow others to use your version of this file under the SPL,  *
 *  indicate your decision by deleting the provisions above and replace      *
 *  them with the notice and other provisions required by the LGPL.  If you  *
 *  do not delete the provisions above, a recipient may use your version of  *
 *  this file under either the SPL or the LGPL.                              *
 *                                                                           *
 *  Patrick Niemeyer ([email protected])                                           *
 *  Author of Learning Java, O'Reilly & Associates                           *
 *  http://www.pat.net/~pat/                                                 *
 *                                                                           *
 *****************************************************************************/

package bsh;

class BSHLiteral extends SimpleNode {
        public Object value;

        BSHLiteral(int id) {
                super(id);
        }

        public Object eval(CallStack callstack, Interpreter interpreter) throws EvalError {
                if (value == null)
                        throw new InterpreterError("Null in bsh literal: " + value);

                return value;
        }

        private char getEscapeChar(char ch) {
                switch (ch) {
                case 'b':
                        ch = '\b';
                        break;

                case 't':
                        ch = '\t';
                        break;

                case 'n':
                        ch = '\n';
                        break;

                case 'f':
                        ch = '\f';
                        break;

                case 'r':
                        ch = '\r';
                        break;

                // do nothing - ch already contains correct character
                case '"':
                case '\'':
                case '\\':
                        break;
                }

                return ch;
        }

        public void charSetup(String str) {
                char ch = str.charAt(0);
                if (ch == '\\') {
                        // get next character
                        ch = str.charAt(1);

                        if (Character.isDigit(ch))
                                ch = (char) Integer.parseInt(str.substring(1), 8);
                        else
                                ch = getEscapeChar(ch);
                }

                value = new Primitive(new Character(ch).charValue());
        }

        void stringSetup(String str) {
                StringBuffer buffer = new StringBuffer();
                for (int i = 0; i < str.length(); i++) {
                        char ch = str.charAt(i);
                        if (ch == '\\') {
                                // get next character
                                ch = str.charAt(++i);

                                if (Character.isDigit(ch)) {
                                        int endPos = i;

                                        // check the next two characters
                                        while (endPos < i + 2) {
                                                if (Character.isDigit(str.charAt(endPos + 1)))
                                                        endPos++;
                                                else
                                                        break;
                                        }

                                        ch = (char) Integer.parseInt(str.substring(i, endPos + 1), 8);
                                        i = endPos;
                                } else
                                        ch = getEscapeChar(ch);
                        }

                        buffer.append(ch);
                }

                value = buffer.toString().intern();
        }
}