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