/**
* Perform a CSS Identifier level 2 (basic set and all non-ASCII chars) <strong>escape</strong>
* operation on a <tt>char[]</tt> input.
*
* <p><em>Level 2</em> means this method will escape:
*
* <ul>
* <li>The CSS Identifier basic escape set:
* <ul>
* <li>The <em>Backslash Escapes</em>: <tt>\ </tt> (<tt>U+0020</tt>), <tt>\!</tt>
* (<tt>U+0021</tt>), <tt>\"</tt> (<tt>U+0022</tt>), <tt>\#</tt>
* (<tt>U+0023</tt>), <tt>\$</tt> (<tt>U+0024</tt>), <tt>\%</tt>
* (<tt>U+0025</tt>), <tt>\&</tt> (<tt>U+0026</tt>), <tt>\'</tt>
* (<tt>U+0027</tt>), <tt>\(</tt> (<tt>U+0028</tt>), <tt>\)</tt>
* (<tt>U+0029</tt>), <tt>\*</tt> (<tt>U+002A</tt>), <tt>\+</tt>
* (<tt>U+002B</tt>), <tt>\,</tt> (<tt>U+002C</tt>), <tt>\.</tt>
* (<tt>U+002E</tt>), <tt>\/</tt> (<tt>U+002F</tt>), <tt>\;</tt>
* (<tt>U+003B</tt>), <tt>\<</tt> (<tt>U+003C</tt>), <tt>\=</tt>
* (<tt>U+003D</tt>), <tt>\></tt> (<tt>U+003E</tt>), <tt>\?</tt>
* (<tt>U+003F</tt>), <tt>\@</tt> (<tt>U+0040</tt>), <tt>\[</tt>
* (<tt>U+005B</tt>), <tt>\\</tt> (<tt>U+005C</tt>), <tt>\]</tt>
* (<tt>U+005D</tt>), <tt>\^</tt> (<tt>U+005E</tt>), <tt>\`</tt>
* (<tt>U+0060</tt>), <tt>\{</tt> (<tt>U+007B</tt>), <tt>\|</tt>
* (<tt>U+007C</tt>), <tt>\}</tt> (<tt>U+007D</tt>) and <tt>\~</tt>
* (<tt>U+007E</tt>). Note that the <tt>\-</tt> (<tt>U+002D</tt>) escape sequence
* exists, but will only be used when an identifier starts with two hypens or hyphen +
* digit. Also, the <tt>\_</tt> (<tt>U+005F</tt>) escape will only be used at the
* beginning of an identifier to avoid problems with Internet Explorer 6. In the same
* sense, note that the <tt>\:</tt> (<tt>U+003A</tt>) escape sequence is also
* defined in the standard, but will not be used for escaping as Internet Explorer
* < 8 does not recognize it.
* <li>Two ranges of non-displayable, control characters: <tt>U+0000</tt> to
* <tt>U+001F</tt> and <tt>U+007F</tt> to <tt>U+009F</tt>.
* </ul>
* <li>All non ASCII characters.
* </ul>
*
* <p>This escape will be performed by using Backslash escapes whenever possible. For escaped
* characters that do not have an associated Backslash, default to <tt>\FF </tt> Hexadecimal
* Escapes.
*
* <p>This method calls {@link #escapeCssIdentifier(char[], int, int, java.io.Writer,
* CssIdentifierEscapeType, CssIdentifierEscapeLevel)} with the following preconfigured values:
*
* <ul>
* <li><tt>type</tt>: {@link CssIdentifierEscapeType#BACKSLASH_ESCAPES_DEFAULT_TO_COMPACT_HEXA}
* <li><tt>level</tt>: {@link
* CssIdentifierEscapeLevel#LEVEL_2_ALL_NON_ASCII_PLUS_BASIC_ESCAPE_SET}
* </ul>
*
* <p>This method is <strong>thread-safe</strong>.
*
* @param text the <tt>char[]</tt> to be escaped.
* @param offset the position in <tt>text</tt> at which the escape operation should start.
* @param len the number of characters in <tt>text</tt> that should be escaped.
* @param writer the <tt>java.io.Writer</tt> to which the escaped 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 escapeCssIdentifier(
final char[] text, final int offset, final int len, final Writer writer) throws IOException {
escapeCssIdentifier(
text,
offset,
len,
writer,
CssIdentifierEscapeType.BACKSLASH_ESCAPES_DEFAULT_TO_COMPACT_HEXA,
CssIdentifierEscapeLevel.LEVEL_2_ALL_NON_ASCII_PLUS_BASIC_ESCAPE_SET);
}
private CssFinder toCSS() {
return new CssFinder("." + CssEscape.escapeCssIdentifier(this.unescapedClassName));
}