EntityUtils.java

/**
 * Copyright 2014 
 * SMEdit https://github.com/StarMade/SMEdit
 * SMTools https://github.com/StarMade/SMTools
 *
 * 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 jo.sm.logic.utils;

/**
 * @Auther Jo Jaquinta for SMEdit Classic - version 1.0
 **/
class EntityUtils {

    // LATIN-1, A0-FF
    private static final String[] LATIN1 = {
        " ",
        "¡",
        "¢",
        "£",
        "¤",
        "¥",
        "¦",
        "§",
        "¨",
        "©",
        "ª",
        "«",
        "¬",
        "­",
        "®",
        "¯",
        "°",
        "±",
        "²",
        "³",
        "´",
        "µ",
        "¶",
        "·",
        "¸",
        "¹",
        "º",
        "»",
        "¼",
        "½",
        "¾",
        "¿",
        "À",
        "Á",
        "Â",
        "Ã",
        "Ä",
        "Å",
        "Æ",
        "Ç",
        "È",
        "É",
        "Ê",
        "Ë",
        "Ì",
        "Í",
        "Î",
        "Ï",
        "Ð",
        "Ñ",
        "Ò",
        "Ó",
        "Ô",
        "Õ",
        "Ö",
        "×",
        "Ø",
        "Ù",
        "Ú",
        "Û",
        "Ü",
        "Ý",
        "Þ",
        "ß",
        "à",
        "á",
        "â",
        "ã",
        "ä",
        "å",
        "æ",
        "ç",
        "è",
        "é",
        "ê",
        "ë",
        "ì",
        "í",
        "î",
        "ï",
        "ð",
        "ñ",
        "ò",
        "ó",
        "ô",
        "õ",
        "ö",
        "÷",
        "ø",
        "ù",
        "ú",
        "û",
        "ü",
        "ý",
        "þ",
        "ÿ",};

    @SuppressWarnings("empty-statement")
    public static String insertEntities(String txt, boolean latin1) {
        if (txt == null) {
            return null;
        }
        StringBuilder ret = new StringBuilder();
        char[] c = txt.toCharArray();
        for (int i = 0; i < c.length; i++) {
            if (c[i] == '&') {
                ret.append("&");
            } else if (c[i] == '<') {
                ret.append("<");
            } else if (c[i] == '>') {
                ret.append(">");
            } else if (c[i] == '\"') {
                ret.append(""");
            } else if ((c[i] >= 0x20) && (c[i] < 0x80)) {
                ret.append(c[i]);
            } else if (Character.isWhitespace(c[i])) {
                ret.append(c[i]);
            } else if (c[i] < 0x20)
                ; // skip control characters
            else {
                if (latin1 && ((c[i] >= 0xa0) && (c[i] <= 0xff))) {
                    ret.append(LATIN1[c[i] - 0xa0]);
                } else {
                    ret.append("&#x");
                    ret.append(Integer.toHexString(c[i]));
                    ret.append(";");
                }
            }
        }
        return ret.toString();
    }

    public static String removeEntities(String txt, boolean latin1) {
        if (txt == null) {
            return null;
        }
        for (;;) {
            int o = txt.indexOf("&#");
            if (o < 0) {
                break;
            }
            int o2 = txt.indexOf(';', o);
            if (o2 < 0) {
                break;
            }
            String num = txt.substring(o + 2, o2);
            char ch;
            if (num.startsWith("x")) {
                ch = (char) Integer.parseInt(num.substring(1), 16);
            } else {
                ch = (char) Integer.parseInt(num);
            }
            txt = txt.substring(0, o) + String.valueOf(ch) + txt.substring(o2 + 1);
        }
        txt = txt.replace(">", ">");
        txt = txt.replace("<", "<");
        txt = txt.replace("&", "&");
        if (latin1) {
            for (int i = 0; i < LATIN1.length; i++) {
                for (;;) {
                    int o = txt.indexOf(LATIN1[i]);
                    if (o < 0) {
                        break;
                    }
                    txt = txt.substring(0, o) + String.valueOf((char) (i + 0xa0)) + txt.substring(o + LATIN1[i].length());
                }
            }
        }
        return txt;
    }
}