    001package net.minecraft.util;
    002
    003import java.io.BufferedReader;
    004import java.io.InputStreamReader;
    005
    006public class ChatAllowedCharacters
    007{
    008    /**
    009     * This String have the characters allowed in any text drawing of minecraft.
    010     */
    011    public static final String allowedCharacters = getAllowedCharacters();
    012
    013    /**
    014     * Array of the special characters that are allowed in any text drawing of Minecraft.
    015     */
    016    public static final char[] allowedCharactersArray = new char[] {'/', '\n', '\r', '\t', '\u0000', '\f', '`', '?', '*', '\\', '<', '>', '|', '\"', ':'};
    017
    018    /**
    019     * Load the font.txt resource file, that is on UTF-8 format. This file contains the characters that minecraft can
    020     * render Strings on screen.
    021     */
    022    private static String getAllowedCharacters()
    023    {
    024        String s = "";
    025
    026        try
    027        {
    028            BufferedReader bufferedreader = new BufferedReader(new InputStreamReader(ChatAllowedCharacters.class.getResourceAsStream("/font.txt"), "UTF-8"));
    029            String s1 = "";
    030
    031            while ((s1 = bufferedreader.readLine()) != null)
    032            {
    033                if (!s1.startsWith("#"))
    034                {
    035                    s = s + s1;
    036                }
    037            }
    038
    039            bufferedreader.close();
    040        }
    041        catch (Exception exception)
    042        {
    043            ;
    044        }
    045
    046        return s;
    047    }
    048
    049    public static final boolean isAllowedCharacter(char par0)
    050    {
    051        return par0 != 167 && (allowedCharacters.indexOf(par0) >= 0 || par0 > 32);
    052    }
    053
    054    /**
    055     * Filter string by only keeping those characters for which isAllowedCharacter() returns true.
    056     */
    057    public static String filerAllowedCharacters(String par0Str)
    058    {
    059        StringBuilder stringbuilder = new StringBuilder();
    060        char[] achar = par0Str.toCharArray();
    061        int i = achar.length;
    062
    063        for (int j = 0; j < i; ++j)
    064        {
    065            char c0 = achar[j];
    066
    067            if (isAllowedCharacter(c0))
    068            {
    069                stringbuilder.append(c0);
    070            }
    071        }
    072
    073        return stringbuilder.toString();
    074    }
    075}