/**
* Perform a CSS <strong>unescape</strong> operation on a <tt>char[]</tt> input.
*
* <p>No additional configuration arguments are required. Unescape operations will always perform
* <em>complete</em> CSS unescape of backslash and hexadecimal escape sequences.
*
* <p>This method is <strong>thread-safe</strong>.
*
* @param text the <tt>char[]</tt> to be unescaped.
* @param offset the position in <tt>text</tt> at which the unescape operation should start.
* @param len the number of characters in <tt>text</tt> that should be unescaped.
* @param writer the <tt>java.io.Writer</tt> to which the unescaped result will be written.
* Nothing will be written at all to this writer if <tt>text</tt> is <tt>null</tt>.
* @throws IOException if an input/output exception occurs
*/
public static void unescapeCss(
final char[] text, final int offset, final int len, final Writer writer) throws IOException {
if (writer == null) {
throw new IllegalArgumentException("Argument 'writer' cannot be null");
}
final int textLen = (text == null ? 0 : text.length);
if (offset < 0 || offset > textLen) {
throw new IllegalArgumentException(
"Invalid (offset, len). offset=" + offset + ", len=" + len + ", text.length=" + textLen);
}
if (len < 0 || (offset + len) > textLen) {
throw new IllegalArgumentException(
"Invalid (offset, len). offset=" + offset + ", len=" + len + ", text.length=" + textLen);
}
CssUnescapeUtil.unescape(text, offset, len, writer);
}
/**
* Perform a CSS <strong>unescape</strong> operation on a <tt>String</tt> input.
*
* <p>No additional configuration arguments are required. Unescape operations will always perform
* <em>complete</em> CSS unescape of backslash and hexadecimal escape sequences.
*
* <p>This method is <strong>thread-safe</strong>.
*
* @param text the <tt>String</tt> to be unescaped.
* @return The unescaped result <tt>String</tt>. As a memory-performance improvement, will return
* the exact same object as the <tt>text</tt> input argument if no unescaping modifications
* were required (and no additional <tt>String</tt> objects will be created during
* processing). Will return <tt>null</tt> if <tt>text</tt> is <tt>null</tt>.
*/
public static String unescapeCss(final String text) {
return CssUnescapeUtil.unescape(text);
}