Method escape

src/main/java/matcher/srcprocess/HtmlUtil.java:49–91

(String str, String... allowedTags)

	}

	public static String escape(String str, String... allowedTags) {
		Pattern tagPattern = compileTagPattern(allowedTags);
		StringBuilder ret = null;
		int retEnd = 0;

		for (int i = 0, max = str.length(); i < max; i++) {
			char c = str.charAt(i);

			if (c == '<' || c == '>' || c == '&') {
				if (ret == null) ret = new StringBuilder(max * 2);

				if (c == '<' && allowedTags != null) {
					int pos = str.substring(i, str.length()).indexOf('>');

					if (tagPattern.matcher(str.substring(i, i + pos + 1)).find()) {
						// Skip ahead to after the tag
						i += pos;
						continue;
					}
				}

				ret.append(str, retEnd, i);

				if (c == '<') {
					ret.append("&lt;");
				} else if (c == '>') {
					ret.append("&gt;");
				} else {
					ret.append("&amp;");
				}

				retEnd = i + 1;
			}
		}

		if (ret == null) {
			return str;
		} else {
			ret.append(str, retEnd, str.length());

			return ret.toString();
		}
	}

	private static Pattern compileTagPattern(String... tags) {
		StringBuilder builder = new StringBuilder();