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jellyfin/Emby.Common.Implementations/TextEncoding/NLangDetect/Utils/NGram.cs
Luke Pulverenti 0e7cbb0465 add subtitle language detection
2017-06-17 18:59:17 -04:00

331 lines
9.6 KiB
C#
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// TODO IMM HI: check which classes can be made internal?
using System.Collections.Generic;
using System.Text;
using NLangDetect.Core.Extensions;
namespace NLangDetect.Core.Utils
{
public class NGram
{
public const int GramsCount = 3;
private static readonly string Latin1Excluded = Messages.getString("NGram.LATIN1_EXCLUDE");
private static readonly string[] CjkClass =
{
#region CJK classes
Messages.getString("NGram.KANJI_1_0"),
Messages.getString("NGram.KANJI_1_2"),
Messages.getString("NGram.KANJI_1_4"),
Messages.getString("NGram.KANJI_1_8"),
Messages.getString("NGram.KANJI_1_11"),
Messages.getString("NGram.KANJI_1_12"),
Messages.getString("NGram.KANJI_1_13"),
Messages.getString("NGram.KANJI_1_14"),
Messages.getString("NGram.KANJI_1_16"),
Messages.getString("NGram.KANJI_1_18"),
Messages.getString("NGram.KANJI_1_22"),
Messages.getString("NGram.KANJI_1_27"),
Messages.getString("NGram.KANJI_1_29"),
Messages.getString("NGram.KANJI_1_31"),
Messages.getString("NGram.KANJI_1_35"),
Messages.getString("NGram.KANJI_2_0"),
Messages.getString("NGram.KANJI_2_1"),
Messages.getString("NGram.KANJI_2_4"),
Messages.getString("NGram.KANJI_2_9"),
Messages.getString("NGram.KANJI_2_10"),
Messages.getString("NGram.KANJI_2_11"),
Messages.getString("NGram.KANJI_2_12"),
Messages.getString("NGram.KANJI_2_13"),
Messages.getString("NGram.KANJI_2_15"),
Messages.getString("NGram.KANJI_2_16"),
Messages.getString("NGram.KANJI_2_18"),
Messages.getString("NGram.KANJI_2_21"),
Messages.getString("NGram.KANJI_2_22"),
Messages.getString("NGram.KANJI_2_23"),
Messages.getString("NGram.KANJI_2_28"),
Messages.getString("NGram.KANJI_2_29"),
Messages.getString("NGram.KANJI_2_30"),
Messages.getString("NGram.KANJI_2_31"),
Messages.getString("NGram.KANJI_2_32"),
Messages.getString("NGram.KANJI_2_35"),
Messages.getString("NGram.KANJI_2_36"),
Messages.getString("NGram.KANJI_2_37"),
Messages.getString("NGram.KANJI_2_38"),
Messages.getString("NGram.KANJI_3_1"),
Messages.getString("NGram.KANJI_3_2"),
Messages.getString("NGram.KANJI_3_3"),
Messages.getString("NGram.KANJI_3_4"),
Messages.getString("NGram.KANJI_3_5"),
Messages.getString("NGram.KANJI_3_8"),
Messages.getString("NGram.KANJI_3_9"),
Messages.getString("NGram.KANJI_3_11"),
Messages.getString("NGram.KANJI_3_12"),
Messages.getString("NGram.KANJI_3_13"),
Messages.getString("NGram.KANJI_3_15"),
Messages.getString("NGram.KANJI_3_16"),
Messages.getString("NGram.KANJI_3_18"),
Messages.getString("NGram.KANJI_3_19"),
Messages.getString("NGram.KANJI_3_22"),
Messages.getString("NGram.KANJI_3_23"),
Messages.getString("NGram.KANJI_3_27"),
Messages.getString("NGram.KANJI_3_29"),
Messages.getString("NGram.KANJI_3_30"),
Messages.getString("NGram.KANJI_3_31"),
Messages.getString("NGram.KANJI_3_32"),
Messages.getString("NGram.KANJI_3_35"),
Messages.getString("NGram.KANJI_3_36"),
Messages.getString("NGram.KANJI_3_37"),
Messages.getString("NGram.KANJI_3_38"),
Messages.getString("NGram.KANJI_4_0"),
Messages.getString("NGram.KANJI_4_9"),
Messages.getString("NGram.KANJI_4_10"),
Messages.getString("NGram.KANJI_4_16"),
Messages.getString("NGram.KANJI_4_17"),
Messages.getString("NGram.KANJI_4_18"),
Messages.getString("NGram.KANJI_4_22"),
Messages.getString("NGram.KANJI_4_24"),
Messages.getString("NGram.KANJI_4_28"),
Messages.getString("NGram.KANJI_4_34"),
Messages.getString("NGram.KANJI_4_39"),
Messages.getString("NGram.KANJI_5_10"),
Messages.getString("NGram.KANJI_5_11"),
Messages.getString("NGram.KANJI_5_12"),
Messages.getString("NGram.KANJI_5_13"),
Messages.getString("NGram.KANJI_5_14"),
Messages.getString("NGram.KANJI_5_18"),
Messages.getString("NGram.KANJI_5_26"),
Messages.getString("NGram.KANJI_5_29"),
Messages.getString("NGram.KANJI_5_34"),
Messages.getString("NGram.KANJI_5_39"),
Messages.getString("NGram.KANJI_6_0"),
Messages.getString("NGram.KANJI_6_3"),
Messages.getString("NGram.KANJI_6_9"),
Messages.getString("NGram.KANJI_6_10"),
Messages.getString("NGram.KANJI_6_11"),
Messages.getString("NGram.KANJI_6_12"),
Messages.getString("NGram.KANJI_6_16"),
Messages.getString("NGram.KANJI_6_18"),
Messages.getString("NGram.KANJI_6_20"),
Messages.getString("NGram.KANJI_6_21"),
Messages.getString("NGram.KANJI_6_22"),
Messages.getString("NGram.KANJI_6_23"),
Messages.getString("NGram.KANJI_6_25"),
Messages.getString("NGram.KANJI_6_28"),
Messages.getString("NGram.KANJI_6_29"),
Messages.getString("NGram.KANJI_6_30"),
Messages.getString("NGram.KANJI_6_32"),
Messages.getString("NGram.KANJI_6_34"),
Messages.getString("NGram.KANJI_6_35"),
Messages.getString("NGram.KANJI_6_37"),
Messages.getString("NGram.KANJI_6_39"),
Messages.getString("NGram.KANJI_7_0"),
Messages.getString("NGram.KANJI_7_3"),
Messages.getString("NGram.KANJI_7_6"),
Messages.getString("NGram.KANJI_7_7"),
Messages.getString("NGram.KANJI_7_9"),
Messages.getString("NGram.KANJI_7_11"),
Messages.getString("NGram.KANJI_7_12"),
Messages.getString("NGram.KANJI_7_13"),
Messages.getString("NGram.KANJI_7_16"),
Messages.getString("NGram.KANJI_7_18"),
Messages.getString("NGram.KANJI_7_19"),
Messages.getString("NGram.KANJI_7_20"),
Messages.getString("NGram.KANJI_7_21"),
Messages.getString("NGram.KANJI_7_23"),
Messages.getString("NGram.KANJI_7_25"),
Messages.getString("NGram.KANJI_7_28"),
Messages.getString("NGram.KANJI_7_29"),
Messages.getString("NGram.KANJI_7_32"),
Messages.getString("NGram.KANJI_7_33"),
Messages.getString("NGram.KANJI_7_35"),
Messages.getString("NGram.KANJI_7_37"),
#endregion
};
private static readonly Dictionary<char, char> _cjkMap;
private StringBuilder _grams;
private bool _capitalword;
#region Constructor(s)
static NGram()
{
_cjkMap = new Dictionary<char, char>();
foreach (string cjk_list in CjkClass)
{
char representative = cjk_list[0];
for (int i = 0; i < cjk_list.Length; i++)
{
_cjkMap.Add(cjk_list[i], representative);
}
}
}
public NGram()
{
_grams = new StringBuilder(" ");
_capitalword = false;
}
#endregion
#region Public methods
public static char Normalize(char ch)
{
UnicodeBlock? unicodeBlock = ch.GetUnicodeBlock();
if (!unicodeBlock.HasValue)
{
return ch;
}
switch (unicodeBlock.Value)
{
case UnicodeBlock.BasicLatin:
{
if (ch < 'A' || (ch < 'a' && ch > 'Z') || ch > 'z')
{
return ' ';
}
break;
}
case UnicodeBlock.Latin1Supplement:
{
if (Latin1Excluded.IndexOf(ch) >= 0)
{
return ' ';
}
break;
}
case UnicodeBlock.GeneralPunctuation:
{
return ' ';
}
case UnicodeBlock.Arabic:
{
if (ch == '\u06cc')
{
return '\u064a';
}
break;
}
case UnicodeBlock.LatinExtendedAdditional:
{
if (ch >= '\u1ea0')
{
return '\u1ec3';
}
break;
}
case UnicodeBlock.Hiragana:
{
return '\u3042';
}
case UnicodeBlock.Katakana:
{
return '\u30a2';
}
case UnicodeBlock.Bopomofo:
case UnicodeBlock.BopomofoExtended:
{
return '\u3105';
}
case UnicodeBlock.CjkUnifiedIdeographs:
{
if (_cjkMap.ContainsKey(ch))
{
return _cjkMap[ch];
}
break;
}
case UnicodeBlock.HangulSyllables:
{
return '\uac00';
}
}
return ch;
}
public void AddChar(char ch)
{
ch = Normalize(ch);
char lastchar = _grams[_grams.Length - 1];
if (lastchar == ' ')
{
_grams = new StringBuilder(" ");
_capitalword = false;
if (ch == ' ') return;
}
else if (_grams.Length >= GramsCount)
{
_grams.Remove(0, 1);
}
_grams.Append(ch);
if (char.IsUpper(ch))
{
if (char.IsUpper(lastchar)) _capitalword = true;
}
else
{
_capitalword = false;
}
}
public string Get(int n)
{
if (_capitalword)
{
return null;
}
int len = _grams.Length;
if (n < 1 || n > 3 || len < n)
{
return null;
}
if (n == 1)
{
char ch = _grams[len - 1];
if (ch == ' ')
{
return null;
}
return ch.ToString();
}
// TODO IMM HI: is ToString() here effective?
return _grams.ToString().SubSequence(len - n, len);
}
#endregion
}
}
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