/*
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This 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 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.ajax4jsf.javascript;
/**
* Encode chars as JavaScript sequences
*
* @author shura
*/
import java.nio.CharBuffer;
public class JSEncoder {
// private char APOSTROPHE[] = { '\\', '\'' };
private static final char[] ENCODE_HEX = "0123456789ABCDEF".toCharArray();
private static final char[] ENCODE_QUOT = "\\\"".toCharArray();
private static final char[] ENCODE_LF = "\\n".toCharArray();
private static final char[] ENCODE_BC = "\\b".toCharArray();
private static final char[] ENCODE_FF = "\\f".toCharArray();
private static final char[] ENCODE_CR = "\\r".toCharArray();
private static final char[] ENCODE_TAB = "\\t".toCharArray();
private static final char[] ENCODE_BS = "\\\\".toCharArray();
private static final char[] ENCODE_FS = "\\/".toCharArray();
// frequent '-' ']' '<' '>' chars
private static final char[] ENCODE_HM = "\\u002D".toCharArray();
private static final char[] ENCODE_RB = "\\u005D".toCharArray();
private static final char[] ENCODE_LT = "\\u003C".toCharArray();
private static final char[] ENCODE_GT = "\\u003E".toCharArray();
private static final CharBuffer ENCODE_QUOT_CB = CharBuffer.wrap(ENCODE_QUOT);
private static final CharBuffer ENCODE_LF_CB = CharBuffer.wrap(ENCODE_LF);
private static final CharBuffer ENCODE_BC_CB = CharBuffer.wrap(ENCODE_BC);
private static final CharBuffer ENCODE_FF_CB = CharBuffer.wrap(ENCODE_FF);
private static final CharBuffer ENCODE_CR_CB = CharBuffer.wrap(ENCODE_CR);
private static final CharBuffer ENCODE_TAB_CB = CharBuffer.wrap(ENCODE_TAB);
private static final CharBuffer ENCODE_BS_CB = CharBuffer.wrap(ENCODE_BS);
private static final CharBuffer ENCODE_FS_CB = CharBuffer.wrap(ENCODE_FS);
private static final CharBuffer ENCODE_HM_CB = CharBuffer.wrap(ENCODE_HM);
private static final CharBuffer ENCODE_RB_CB = CharBuffer.wrap(ENCODE_RB);
private static final CharBuffer ENCODE_LT_CB = CharBuffer.wrap(ENCODE_LT);
private static final CharBuffer ENCODE_GT_CB = CharBuffer.wrap(ENCODE_GT);
// private static final char ENCODE_ESC[] = "\\e".toCharArray();
/**
* Create a new instance of this <code>XMLEncoder</code>.
*/
public JSEncoder() {
}
/**
* Return true or false whether this encoding/format can encode the specified character or not.
* <p>
* This method will return true for the following character range: <br />
* <code>
* <nobr>\b | \f | \t | \r | \n | " | \ | / | [#x20-#xD7FF] | [#xE000-#xFFFD]</nobr>
* </code>
* </p>
*
* @see <a href="http://www.w3.org/TR/REC-xml#charsets">W3C XML 1.0 </a>
* @see <a href="http://json.org/">JSON.org</a>
*/
public static boolean compile(char c) {
if ((c == '\b') || (c == '\f') | (c == '\t') || (c == '\n') || (c == '\r') || (c == '"') || (c == '\\') || (c == '/')
|| (c == ']') || // ] - to avoid conflicts in CDATA
(c == '<') || // - escape HTML markup characters
(c == '>') || // - HTML
(c == '&') || // - HTML
(c == '-') || // - HTML comments
(c < 0x20) || // See <http://www.w3.org/TR/REC-xml#charsets>
((c > 0xd7ff) && (c < 0xe000)) || (c > 0xfffd) || (c > 0xff)) {
return false;
}
return true;
}
public static CharBuffer encodeCharBuffer(char c) {
switch (c) {
case '\b':
return ENCODE_BC_CB;
case '\f':
return ENCODE_FF_CB;
case '\t':
return ENCODE_TAB_CB;
case '\n':
return ENCODE_LF_CB;
case '\r':
return ENCODE_CR_CB;
case '"':
return ENCODE_QUOT_CB;
case '\\':
return ENCODE_BS_CB;
case '/':
return ENCODE_FS_CB;
case '-':
return ENCODE_HM_CB;
case ']':
return ENCODE_RB_CB;
case '<':
return ENCODE_LT_CB;
case '>':
return ENCODE_GT_CB;
default: {
char[] ret = { '\\', 'u', ENCODE_HEX[c >> 0xc & 0xf], ENCODE_HEX[c >> 0x8 & 0xf],
ENCODE_HEX[c >> 0x4 & 0xf], ENCODE_HEX[c & 0xf] };
return CharBuffer.wrap(ret);
}
}
}
/**
* Return an array of characters representing the encoding for the specified character.
*/
public char[] encode(char c) {
switch (c) {
case '\b':
return ENCODE_BC;
case '\f':
return ENCODE_FF;
case '\t':
return ENCODE_TAB;
case '\n':
return ENCODE_LF;
case '\r':
return ENCODE_CR;
case '"':
return ENCODE_QUOT;
case '\\':
return ENCODE_BS;
case '/':
return ENCODE_FS;
case '-':
return ENCODE_HM;
case ']':
return ENCODE_RB;
case '<':
return ENCODE_LT;
case '>':
return ENCODE_GT;
default: {
char[] ret = { '\\', 'u', ENCODE_HEX[c >> 0xc & 0xf], ENCODE_HEX[c >> 0x8 & 0xf], ENCODE_HEX[c >> 0x4 & 0xf],
ENCODE_HEX[c & 0xf] };
return ret;
}
}
}
}