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Re: retriving escape unicode sequences from files ...

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  Re: retriving escape unicode sequences from files ... "Arne Vajhøj" <arne.vajhøj@1:261/38.remove-t9h-this> - 2012-08-10 18:39 +0000

#17635 — Re: retriving escape unicode sequences from files ...

  To: qwertmonkey
From: "Arne Vajhoj" <arne.vajhoj@1:261/38.remove-k2r-this>

  To: qwertmonkey
From: "Arne Vajhoj" <arne.vajhoj@1:261/38.remove-qhs-this>

  To: qwertmonkey
From: "Arne Vajhoj" <arne.vajhoj@1:261/38.remove-p82-this>

  To: qwertmonkey
From: Arne Vajhoj <arne@vajhoej.dk>

On 8/4/2012 1:47 PM, qwertmonkey@syberianoutpost.ru wrote:
> ~
>   I would use your pattern matcher but instead of
> "Character.toString((char)Integer.parseInt" ... stuff, I would use a look-up
> table
> ~

You could.

But I am not sure that it is practical.

>   Here is the outline of my code:
> ~
> // __
>   private HashMap<String, Integer> HMHex2Int;
> // __
>   private final String aRegXPtrn = "\\\\u([0-9a-f]{4})";
>   private final Pattern UKdRegX = Pattern.compile(aRegXPtrn,
> Pattern.CASE_INSENSITIVE);
> // __
>   private final String[] aHex2ByteTbl = new String[]{
>    "00", "01", "02", "03", "04", "05", "06", "07",
>    "08", "09", "0a", "0b", "0c", "0d", "0e", "0f",
>    "10", "11", "12", "13", "14", "15", "16", "17",
>    "18", "19", "1a", "1b", "1c", "1d", "1e", "1f",
>    "20", "21", "22", "23", "24", "25", "26", "27",
>    "28", "29", "2a", "2b", "2c", "2d", "2e", "2f",
>    "30", "31", "32", "33", "34", "35", "36", "37",
>    "38", "39", "3a", "3b", "3c", "3d", "3e", "3f",
>    "40", "41", "42", "43", "44", "45", "46", "47",
>    "48", "49", "4a", "4b", "4c", "4d", "4e", "4f",
>    "50", "51", "52", "53", "54", "55", "56", "57",
>    "58", "59", "5a", "5b", "5c", "5d", "5e", "5f",
>    "60", "61", "62", "63", "64", "65", "66", "67",
>    "68", "69", "6a", "6b", "6c", "6d", "6e", "6f",
>    "70", "71", "72", "73", "74", "75", "76", "77",
>    "78", "79", "7a", "7b", "7c", "7d", "7e", "7f",
>    "80", "81", "82", "83", "84", "85", "86", "87",
>    "88", "89", "8a", "8b", "8c", "8d", "8e", "8f",
>    "90", "91", "92", "93", "94", "95", "96", "97",
>    "98", "99", "9a", "9b", "9c", "9d", "9e", "9f",
>    "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7",
>    "a8", "a9", "aa", "ab", "ac", "ad", "ae", "af",
>    "b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7",
>    "b8", "b9", "ba", "bb", "bc", "bd", "be", "bf",
>    "c0", "c1", "c2", "c3", "c4", "c5", "c6", "c7",
>    "c8", "c9", "ca", "cb", "cc", "cd", "ce", "cf",
>    "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
>    "d8", "d9", "da", "db", "dc", "dd", "de", "df",
>    "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7",
>    "e8", "e9", "ea", "eb", "ec", "ed", "ee", "ef",
>    "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
>    "f8", "f9", "fa", "fb", "fc", "fd", "fe", "ff"
>   };
> ~
> // __ ctor
> ~
>    HMHex2Int = new HashMap<String, Integer>();
>    for(int i = 0; (i < aHex2ByteTbl.length); ++i){
HMHex2Int.put(aHex2ByteTbl[i], HMHex2Int.size()); }
> ~
>   then:
> ~
> // __ converts from \(\)u#### (front slash u sequences not turn to strings by
the compiler) to unikd
>   public String unescapeHex2String(String aFSU) throws
UnsupportedEncodingException{
>    StringBuilder aBldr = null;
> // __
>    int iFSUL;
>    if((aFSU != null) && ((iFSUL = aFSU.length()) > 0)){
>     int[] iHex = new int[2];
>     int iHexArL = iHex.length;
>     String aUKdS;
>     aBldr = new StringBuilder();
> // __
>     Matcher UKdRegXMtx = UKdRegX.matcher(aFSU);
> // __
>     while (UKdRegXMtx.find()){
>      aUKdS = aFSU.substring((UKdRegXMtx.start() + 2), UKdRegXMtx.end());
> // __
>      for(int j = 0; (j < iHexArL); ++j){ iHex[j] =
HMHex2Byte.get(aUKdS.substring(2*j, 2*(j + 1)).toLowerCase()).intValue(); }// j 
[0, iHexArL)
> // __
>      aBldr.append((char)(16*iHex[0] + iHex[1]));
>     }
>    }// ((aFSU != null) && ((iFSUL = aFSU.length()) > 0))
> // __
>    return(aBldr.toString());
>   }
> ~

But:
1) the code is difficult to read
2) HMHex2Byte is not declared - it probably is HMHex2Int 3) it seems as if you 
lookup 4 bit values in an 8 bit table?? 4) the code does not handle code points
>255

Arne

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