htmlutils.java

spring的源代码

				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 376) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 402) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 710) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 732) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 913 && c <= 929) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 931 && c <= 937) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 945 && c <= 969) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 977 && c <= 978) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 982) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8194 && c <= 8195) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8201) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8204 && c <= 8207) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8211 && c <= 8212) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8216 && c <= 8218) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8220 && c <= 8222) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8224 && c <= 8226) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8230) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8240) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8242 && c <= 8243) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8249 && c <= 8250) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8254) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8260) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8364) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8465) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8472) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8476) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8482) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8501) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8592 && c <= 8596) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8629) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8656 && c <= 8660) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8704) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8706 && c <= 8707) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8709) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8711 && c <= 8713) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8715) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8719) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8721 && c <= 8722) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8727) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8730) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8733 && c <= 8734) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8736) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8743 && c <= 8747) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8756) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8764) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8773) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8776) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8800 && c <= 8801) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8804 && c <= 8805) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8834 && c <= 8836) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8838 && c <= 8839) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8853) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8855) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8869) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 8901) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 8968 && c <= 8971) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c >= 9001 && c <= 9002) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 9674) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 9824) {
				writeDecimalReference(c, escaped);
				continue;
			}
			if (c == 9827) {
				writeDecimalReference(c, escaped);
				continue;
			}

			// all other chars
			escaped.append(c);
		}
		return escaped.toString();
	}

	/**
	 * Turn HTML character references into their plain text UNICODE equivalent.
	 * <p>Handles complete character set defined in HTML 4.01 recommendation
	 * and all reference types (decimal, hex, and entity).
	 * <p>Correctly converts the following formats:
	 * <blockquote>
	 * &amp;#<i>Decimal</i>; - <i>(Example: &amp;#68;)</i><br>
	 * &amp;#x<i>Hex</i>; - <i>(Example: &amp;#xE5;) case insensitive</i><br>
	 * &amp;#<i>Entity</i>; - <i>(Example: &amp;amp;) case sensitive</i>
	 * </blockquote>
	 * Gracefully handles malformed character references by copying original
	 * characters as is when encountered.<p>
	 * <p>Reference:
	 * <a href="http://www.w3.org/TR/html4/sgml/entities.html">
	 * http://www.w3.org/TR/html4/sgml/entities.html
	 * </a>
	 */
	public static String htmlUnescape(String s) {
		if (s == null) {
			return null;
		}

		StringBuffer unescaped = new StringBuffer(s.length());
		for (int i = 0; i < s.length(); i++) {
			char c = s.charAt(i);
			if (c == '&') {
				// don't look more than 12 chars ahead as reference like strings
				// should not be longer than 12 chars in length (including ';')
				// prevents the entire string from being searched when an '&'
				// with no following ';' is an encountered
				int start = Math.min(i + 1, s.length() - 1);
				int end = Math.min(s.length(), start + 12);

				String reference = s.substring(start, end);
				int semi = reference.indexOf(';');

				if (semi == -1) {
					unescaped.append(c);
					continue;
				}

				reference = reference.substring(0, semi);
				i = start + semi;

				// try entity reference first
				Integer iso = (Integer) ENTITIES.get(reference);
				if (iso != null) {
					unescaped.append((char) iso.intValue());
					continue;
				}

				if (reference.length() == 0) {
					unescaped.append(EMPTY_REFERENCE);
					continue;
				}

				if (reference.charAt(0) == '#') {
					if (reference.length() > 2) {
						int index = 1;
						if (reference.charAt(1) == 'x' || reference.charAt(1) == 'X') {
							index = 2;
						}
						try {
							unescaped.append(
							    (char) Integer.parseInt(
							        reference.substring(index),
							        (index == 1) ? 10 : 16));
							continue;
						}
						catch (NumberFormatException e) {
							// wasn't hex or decimal, copy original chars
							unescaped.append('&' + reference + ';');
							continue;
						}
					}
					unescaped.append(MALFORMED_REFERENCE);
					continue;
				}

				// may not be valid reference, forget it
				i = start - 1;
			}
			unescaped.append(c);
		}
		return unescaped.toString();
	}

	/**
	 * Write the given character as decimal reference.
	 * @param c the character to write
	 * @param buf the buffer to write into
	 */
	private static void writeDecimalReference(char c, StringBuffer buf) {
		buf.append(REFERENCE_START);
		buf.append((int) c);
		buf.append(';');
	}

}