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using Implab;
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using Implab.Parsing;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace Implab.JSON {
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/// <summary>
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/// Класс для преобразования экранированной строки JSON
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/// </summary>
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public class StringTranslator : Scanner {
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static readonly char[] _escMap;
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static readonly int[] _hexMap;
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static StringTranslator() {
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var chars = new char[] { 'b', 'f', 't', 'r', 'n', '\\', '/' };
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var vals = new char[] { '\b', '\f', '\t', '\r', '\n', '\\', '/' };
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_escMap = new char[chars.Max() + 1];
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for (int i = 0; i < chars.Length; i++)
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_escMap[chars[i]] = vals[i];
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var hexs = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'A', 'B', 'C', 'D', 'E', 'F' };
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var ints = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 10, 11, 12, 13, 14, 15 };
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_hexMap = new int[hexs.Max() + 1];
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for (int i = 0; i < hexs.Length; i++)
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_hexMap[hexs[i]] = ints[i];
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}
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public StringTranslator()
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: base(JSONGrammar.Instance.JsonStringDFA) {
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}
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public string Translate(string data) {
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Safe.ArgumentNotNull(data, "data");
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return Translate(data.ToCharArray());
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}
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public string Translate(char[] data) {
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Safe.ArgumentNotNull(data, "data");
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return Translate(data, data.Length);
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}
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public string Translate(char[] data, int length) {
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Safe.ArgumentNotNull(data, "data");
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Safe.ArgumentInRange(length, 0, data.Length, "length");
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var translated = new char[length];
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Feed(data,length);
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int pos = 0;
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while (ReadTokenInternal()) {
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switch ((JSONGrammar.TokenType)TokenTags[0]) {
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case JSONGrammar.TokenType.UnescapedChar:
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Array.Copy(m_buffer,m_tokenOffset,translated,pos,m_tokenLen);
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pos += m_tokenLen;
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break;
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case JSONGrammar.TokenType.EscapedChar:
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translated[pos] = _escMap[m_buffer[m_tokenOffset + 1]];
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pos++;
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break;
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case JSONGrammar.TokenType.EscapedUnicode:
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translated[pos] = TranslateHexUnicode(m_buffer,m_tokenOffset + 2);
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pos++;
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break;
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}
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}
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return new String(translated, 0, pos);
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}
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internal static char TranslateEscapedChar(char symbol) {
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return _escMap[symbol];
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}
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internal static char TranslateHexUnicode(char[] symbols, int offset) {
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Debug.Assert(symbols != null);
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Debug.Assert(symbols.Length - offset >= 4);
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int value = (_hexMap[symbols[offset]] << 12)
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| (_hexMap[symbols[offset + 1]] << 8)
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| (_hexMap[symbols[offset + 2]] << 4)
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| (_hexMap[symbols[offset + 3]]);
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return (char)value;
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}
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}
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}
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