/*
 * Copyright 2006-2025 www.anyline.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.anyline.util;
          
public class EscapeUtil{        
    private final static String[] hex = {        
        "00","01","02","03","04","05","06","07","08","09","0A","0B","0C","0D","0E","0F",
        "10","11","12","13","14","15","16","17","18","19","1A","1B","1C","1D","1E","1F",
        "20","21","22","23","24","25","26","27","28","29","2A","2B","2C","2D","2E","2F",
        "30","31","32","33","34","35","36","37","38","39","3A","3B","3C","3D","3E","3F",
        "40","41","42","43","44","45","46","47","48","49","4A","4B","4C","4D","4E","4F",
        "50","51","52","53","54","55","56","57","58","59","5A","5B","5C","5D","5E","5F",
        "60","61","62","63","64","65","66","67","68","69","6A","6B","6C","6D","6E","6F",
        "70","71","72","73","74","75","76","77","78","79","7A","7B","7C","7D","7E","7F",
        "80","81","82","83","84","85","86","87","88","89","8A","8B","8C","8D","8E","8F",
        "90","91","92","93","94","95","96","97","98","99","9A","9B","9C","9D","9E","9F",
        "A0","A1","A2","A3","A4","A5","A6","A7","A8","A9","AA","AB","AC","AD","AE","AF",
        "B0","B1","B2","B3","B4","B5","B6","B7","B8","B9","BA","BB","BC","BD","BE","BF",
        "C0","C1","C2","C3","C4","C5","C6","C7","C8","C9","CA","CB","CC","CD","CE","CF",
        "D0","D1","D2","D3","D4","D5","D6","D7","D8","D9","DA","DB","DC","DD","DE","DF",
        "E0","E1","E2","E3","E4","E5","E6","E7","E8","E9","EA","EB","EC","ED","EE","EF",
        "F0","F1","F2","F3","F4","F5","F6","F7","F8","F9","FA","FB","FC","FD","FE","FF"
    };         
    private final static byte[] val = {        
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,     
        0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F        
    };         
    public static String escape(Object obj) {
    	if(null == obj) return ""; 
    	return escape(obj.toString()); 
    } 
    public static String escape(String s) {
        StringBuffer sbuf = new StringBuffer(); 
    	if(null==s || s.isEmpty()) {
    		return "";        
    	} 
        int len = s.length();         
        for (int i = 0; i < len; i++) {        
            int ch = s.charAt(i);         
            if (ch == ' ') {                       // space : map to '+'          
                sbuf.append(' ');         
            } else if(ch == '/') {
            	sbuf.append('/'); 
            }else if ('A' <= ch && ch <= 'Z') {   // 'A'..'Z' : as it was         
                sbuf.append((char)ch);         
            } else if ('a' <= ch && ch <= 'z') {   // 'a'..'z' : as it was         
                sbuf.append((char)ch);         
            } else if ('0' <= ch && ch <= '9') {   // '0'..'9' : as it was         
                sbuf.append((char)ch);         
            } else if (ch == '-' || ch == '_'       // unreserved : as it was         
                || ch == '.' || ch == '!'         
                || ch == '~' || ch == '*' || ch == '@'         
                || ch == '\'' || ch == '('         
                || ch == ')') {        
                sbuf.append((char)ch);         
            } else if (ch <= 0x007F) {             // other ASCII : map to %XX         
                sbuf.append('%');         
                sbuf.append(hex[ch]);         
            } else {                               // unicode : map to %uXXXX         
                sbuf.append('%');         
                sbuf.append('u');         
                sbuf.append(hex[(ch >>> 8)]);         
                sbuf.append(hex[(0x00FF & ch)]);         
            }         
        }         
        return sbuf.toString();         
    }
    public static String escape2(String s) {
        return escape(escape(s));
    }
    public static String unescape2(String s) {
        return unescape(unescape(s));
    }
    public static String unescape(String s) {
        if(null==s || s.isEmpty()) {
    		return s; 
    	} 
        StringBuffer sbuf = new StringBuffer();         
        int i = 0;         
        int len = s.length();         
        while (i < len) {        
            int ch = s.charAt(i);         
            if (ch == '+') {                       // + : map to ' '          
                sbuf.append(' ');         
            } else if ('A' <= ch && ch <= 'Z') {   // 'A'..'Z' : as it was         
                sbuf.append((char)ch);         
            } else if ('a' <= ch && ch <= 'z') {   // 'a'..'z' : as it was         
                sbuf.append((char)ch);         
            } else if ('0' <= ch && ch <= '9') {   // '0'..'9' : as it was         
                sbuf.append((char)ch);         
            } else if (ch == '-' || ch == '_'       // unreserved : as it was         
                || ch == '.' || ch == '!'         
                || ch == '~' || ch == '*' || ch == '@'        
                || ch == '\'' || ch == '('         
                || ch == ')') {        
                sbuf.append((char)ch);         
            } else if (ch == '%') {        
                int cint = 0;         
                if ('u' != s.charAt(i+1)) {        // %XX : map to ascii(XX)         
                    cint = (cint << 4) | val[s.charAt(i+1)];         
                    cint = (cint << 4) | val[s.charAt(i+2)];         
                    i+=2;         
                } else {                           // %uXXXX : map to unicode(XXXX)         
                    cint = (cint << 4) | val[s.charAt(i+2)];         
                    cint = (cint << 4) | val[s.charAt(i+3)];         
                    cint = (cint << 4) | val[s.charAt(i+4)];         
                    cint = (cint << 4) | val[s.charAt(i+5)];         
                    i+=5;         
                }         
                sbuf.append((char)cint);         
            }         
            i++;         
        }         
        return sbuf.toString();         
    }         
    public static String doubleUnescape(String s) {
    	return unescape(unescape(s)); 
    } 
}   
