StringTranslator.cs
96 lines
| 3.3 KiB
| text/x-csharp
|
CSharpLexer
cin
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r55 | using Implab; | ||
| using Implab.Parsing; | ||||
| using System; | ||||
| using System.Collections.Generic; | ||||
| using System.Diagnostics; | ||||
| using System.Linq; | ||||
| using System.Text; | ||||
| using System.Threading.Tasks; | ||||
| namespace Implab.JSON { | ||||
| /// <summary> | ||||
| /// Класс для преобразования экранированной строки JSON | ||||
| /// </summary> | ||||
| public class StringTranslator : Scanner { | ||||
| static readonly char[] _escMap; | ||||
| static readonly int[] _hexMap; | ||||
| static StringTranslator() { | ||||
| var chars = new char[] { 'b', 'f', 't', 'r', 'n', '\\', '/' }; | ||||
| var vals = new char[] { '\b', '\f', '\t', '\r', '\n', '\\', '/' }; | ||||
| _escMap = new char[chars.Max() + 1]; | ||||
| for (int i = 0; i < chars.Length; i++) | ||||
| _escMap[chars[i]] = vals[i]; | ||||
| 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' }; | ||||
| 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 }; | ||||
| _hexMap = new int[hexs.Max() + 1]; | ||||
| for (int i = 0; i < hexs.Length; i++) | ||||
| _hexMap[hexs[i]] = ints[i]; | ||||
| } | ||||
| public StringTranslator() | ||||
| : base(JSONGrammar.Instance.JsonStringDFA) { | ||||
| } | ||||
| public string Translate(string data) { | ||||
| Safe.ArgumentNotNull(data, "data"); | ||||
| return Translate(data.ToCharArray()); | ||||
| } | ||||
| public string Translate(char[] data) { | ||||
| Safe.ArgumentNotNull(data, "data"); | ||||
| return Translate(data, data.Length); | ||||
| } | ||||
| public string Translate(char[] data, int length) { | ||||
| Safe.ArgumentNotNull(data, "data"); | ||||
| Safe.ArgumentInRange(length, 0, data.Length, "length"); | ||||
| var translated = new char[length]; | ||||
| Feed(data,length); | ||||
| int pos = 0; | ||||
| while (ReadTokenInternal()) { | ||||
| switch ((JSONGrammar.TokenType)TokenTags[0]) { | ||||
| case JSONGrammar.TokenType.UnescapedChar: | ||||
| Array.Copy(m_buffer,m_tokenOffset,translated,pos,m_tokenLen); | ||||
| pos += m_tokenLen; | ||||
| break; | ||||
| case JSONGrammar.TokenType.EscapedChar: | ||||
| translated[pos] = _escMap[m_buffer[m_tokenOffset + 1]]; | ||||
| pos++; | ||||
| break; | ||||
| case JSONGrammar.TokenType.EscapedUnicode: | ||||
| translated[pos] = TranslateHexUnicode(m_buffer,m_tokenOffset + 2); | ||||
| pos++; | ||||
| break; | ||||
| } | ||||
| } | ||||
| return new String(translated, 0, pos); | ||||
| } | ||||
| internal static char TranslateEscapedChar(char symbol) { | ||||
| return _escMap[symbol]; | ||||
| } | ||||
| internal static char TranslateHexUnicode(char[] symbols, int offset) { | ||||
| Debug.Assert(symbols != null); | ||||
| Debug.Assert(symbols.Length - offset >= 4); | ||||
| int value = (_hexMap[symbols[offset]] << 12) | ||||
| | (_hexMap[symbols[offset + 1]] << 8) | ||||
| | (_hexMap[symbols[offset + 2]] << 4) | ||||
| | (_hexMap[symbols[offset + 3]]); | ||||
| return (char)value; | ||||
| } | ||||
| } | ||||
| } | ||||