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package com.gmail.filoghost.hiddenstring;
import java.nio.charset.Charset;
import org.bukkit.ChatColor;
public class HiddenStringUtils {
// String constants. TODO Change them to something unique to avoid conflict with other plugins!
private static final String SEQUENCE_HEADER = "" + ChatColor.RESET + ChatColor.UNDERLINE + ChatColor.RESET;
private static final String SEQUENCE_FOOTER = "" + ChatColor.RESET + ChatColor.ITALIC + ChatColor.RESET;
public static String encodeString(String hiddenString) {
return quote(stringToColors(hiddenString));
}
public static boolean hasHiddenString(String input) {
if (input == null) return false;
return input.indexOf(SEQUENCE_HEADER) > -1 && input.indexOf(SEQUENCE_FOOTER) > -1;
}
public static String extractHiddenString(String input) {
return colorsToString(extract(input));
}
public static String replaceHiddenString(String input, String hiddenString) {
if (input == null) return null;
int start = input.indexOf(SEQUENCE_HEADER);
int end = input.indexOf(SEQUENCE_FOOTER);
if (start < 0 || end < 0) {
return null;
}
return input.substring(0, start + SEQUENCE_HEADER.length()) + stringToColors(hiddenString) + input.substring(end, input.length());
}
/**
* Internal stuff.
*/
private static String quote(String input) {
if (input == null) return null;
return SEQUENCE_HEADER + input + SEQUENCE_FOOTER;
}
private static String extract(String input) {
if (input == null) return null;
int start = input.indexOf(SEQUENCE_HEADER);
int end = input.indexOf(SEQUENCE_FOOTER);
if (start < 0 || end < 0) {
return null;
}
return input.substring(start + SEQUENCE_HEADER.length(), end);
}
private static String stringToColors(String normal) {
if (normal == null) return null;
byte[] bytes = normal.getBytes(Charset.forName("UTF-8"));
char[] chars = new char[bytes.length * 4];
for (int i = 0; i < bytes.length; i++) {
char[] hex = byteToHex(bytes[i]);
chars[i * 4] = ChatColor.COLOR_CHAR;
chars[i * 4 + 1] = hex[0];
chars[i * 4 + 2] = ChatColor.COLOR_CHAR;
chars[i * 4 + 3] = hex[1];
}
return new String(chars);
}
private static String colorsToString(String colors) {
if (colors == null) return null;
colors = colors.toLowerCase().replace("" + ChatColor.COLOR_CHAR, "");
if (colors.length() % 2 != 0) {
colors = colors.substring(0, (colors.length() / 2) * 2);
}
char[] chars = colors.toCharArray();
byte[] bytes = new byte[chars.length / 2];
for (int i = 0; i < chars.length; i += 2) {
bytes[i / 2] = hexToByte(chars[i], chars[i + 1]);
}
return new String(bytes, Charset.forName("UTF-8"));
}
private static int hexToUnsignedInt(char c) {
if (c >= '0' && c <= '9') {
return c - 48;
} else if (c >= 'a' && c <= 'f') {
return c - 87;
} else {
throw new IllegalArgumentException("Invalid hex char: out of range");
}
}
private static char unsignedIntToHex(int i) {
if (i >= 0 && i <= 9) {
return (char) (i + 48);
} else if (i >= 10 && i <= 15) {
return (char) (i + 87);
} else {
throw new IllegalArgumentException("Invalid hex int: out of range");
}
}
private static byte hexToByte(char hex1, char hex0) {
return (byte) (((hexToUnsignedInt(hex1) << 4) | hexToUnsignedInt(hex0)) + Byte.MIN_VALUE);
}
private static char[] byteToHex(byte b) {
int unsignedByte = (int) b - Byte.MIN_VALUE;
return new char[]{unsignedIntToHex((unsignedByte >> 4) & 0xf), unsignedIntToHex(unsignedByte & 0xf)};
}
}
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