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using System.Collections.Generic;
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namespace ZeroLevel.Services.Semantic.Model
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{
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public class Symbol
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{
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internal static char[] _map_ind_ch = new char[64] { 'а', 'б', 'в', 'г', 'д', 'е', 'ё', 'ж', 'з', 'и', 'й', 'к', 'л', 'м', 'н', 'о', 'п', 'р', 'с', 'т', 'у', 'ф', 'х', 'ц', 'ч', 'ш', 'щ', 'ъ', 'ы', 'ь', 'э', 'ю', 'я', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '-', '.', ',', '!', '?' };
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internal static Dictionary<char, byte> _map_ch_ind = new Dictionary<char, byte>(64)
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{
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{'а', 0}, {'б', 1}, {'в', 2}, {'г', 3}, {'д', 4},
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{'е', 5}, {'ё', 6}, {'ж', 7}, {'з', 8}, {'и', 9}, // 10
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{'й', 10}, {'к', 11}, {'л', 12}, {'м', 13}, {'н', 14},
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{'о', 15}, {'п', 16}, {'р', 17}, {'с', 18}, {'т', 19}, // 20
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{'у', 20}, {'ф', 21}, {'х', 22}, {'ц', 23}, {'ч', 24},
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{'ш', 25}, {'щ', 26}, {'ъ', 27}, {'ы', 28}, {'ь', 29}, // 30
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{'э', 30}, {'ю', 31}, {'я', 32},
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{'a', 33}, {'b', 34}, {'c', 35}, {'d', 36}, {'e', 37}, // 38
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{'f', 38}, {'g', 39}, {'h', 40}, {'i', 41}, {'j', 42},
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{'k', 43}, {'l', 44}, {'m', 45}, {'n', 46}, {'o', 47}, // 48
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{'p', 48}, {'q', 49}, {'r', 50}, {'s', 51}, {'t', 52},
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{'u', 53}, {'v', 54}, {'w', 55}, {'x', 56}, {'y', 57}, // 58
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{'z', 58 },
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{ '-', 59}, {'.', 60}, {',', 61}, {'!', 62}, {'?', 63}
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};
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const byte TERMINATE_FLAG = 1;
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const byte HAS_NEXT_FLAG = 2;
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public static byte ToByte(char ch, bool is_leaf = false, bool has_next = false)
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{
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byte b = 0;
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if (_map_ch_ind.TryGetValue(ch, out b))
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{
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b <<= 2;
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if (is_leaf) b |= TERMINATE_FLAG;
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if (has_next) b |= HAS_NEXT_FLAG;
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}
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return b;
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}
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public static bool IsTermiate(byte sym)
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{
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return (sym & TERMINATE_FLAG) == TERMINATE_FLAG;
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}
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public static bool IsLeaf(byte sym)
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{
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return (sym & HAS_NEXT_FLAG) == HAS_NEXT_FLAG;
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}
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public static char ToChar(byte sym)
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{
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var ind = sym >> 2;
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if (ind >= 0 && ind < 64) return _map_ind_ch[ind];
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return '\0';
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}
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}
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}
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