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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Text;
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5 using System.Threading.Tasks;
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6
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7 namespace Implab.Formats.Json {
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8 public class JsonStringScanner : JsonScanner {
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9 const int _defaultBuffer = 64;
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10
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11 readonly string m_data;
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12 int m_offset;
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13
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14 JsonStringScanner(string data, char[] buffer, int pos, int length, int offset) : base(buffer, pos, length) {
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15 m_data = data;
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16 m_offset = offset;
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17 }
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18
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19 protected override int Read(char[] buffer, int offset, int size) {
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20 if (m_data == null)
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21 return 0;
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22 if (m_offset >= m_data.Length)
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23 return 0;
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24
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25 var count = Math.Min(size, m_data.Length - m_offset);
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26
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27 m_data.CopyTo(m_offset, buffer, offset, count);
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28 m_offset += count;
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29
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30 return count;
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31 }
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32
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33 public static JsonStringScanner Create(string data) {
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34 Safe.ArgumentNotNull(data, nameof(data));
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35
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36 if (data.Length <= _defaultBuffer)
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37 return new JsonStringScanner(null, data.ToCharArray(), 0, data.Length, data.Length);
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38
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39 var buffer = new char[_defaultBuffer];
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40 data.CopyTo(0, buffer, 0, _defaultBuffer);
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41 return new JsonStringScanner(data, buffer, 0, _defaultBuffer, _defaultBuffer);
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42 }
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43
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44 public static JsonStringScanner Create(string data, int offset, int length) {
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45 Safe.ArgumentNotNull(data, nameof(data));
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46 Safe.ArgumentGreaterThan(offset, 0, nameof(offset));
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47 Safe.ArgumentGreaterThan(length, 0, nameof(length));
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48
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49 if (offset + length > data.Length)
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50 throw new ArgumentOutOfRangeException("Specified offset and length are out of the string bounds");
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51
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52 if (length <= _defaultBuffer) {
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53 var buffer = new char[length];
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54 data.CopyTo(offset, buffer, 0, length);
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55
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56 return new JsonStringScanner(null, buffer, 0, length, length);
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57 } else {
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58 var buffer = new char[_defaultBuffer];
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59 data.CopyTo(offset, buffer, 0, _defaultBuffer);
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60 return new JsonStringScanner(data, buffer, 0, _defaultBuffer, offset + _defaultBuffer);
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61 }
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62 }
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63
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64 public static JsonStringScanner Create(char[] data, int offset, int length) {
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65 Safe.ArgumentNotNull(data, nameof(data));
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66 Safe.ArgumentGreaterThan(offset, 0, nameof(offset));
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67 Safe.ArgumentGreaterThan(length, 0, nameof(length));
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68
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69 if (offset + length > data.Length)
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70 throw new ArgumentOutOfRangeException("Specified offset and length are out of the array bounds");
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71
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72 return new JsonStringScanner(null, data, offset, offset + length, offset + length);
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73
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74 }
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75 }
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76 }
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