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comparison Implab/Formats/Json/JsonStringScanner.cs @ 235:b49969a7043c v2

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Слияние
author cin
date Thu, 05 Oct 2017 09:24:49 +0300
parents 3e26338eb977
children 7c7e9ad6fe4a
comparison
equal deleted inserted replaced
234:8dd666e6b6bf 235:b49969a7043c
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Threading.Tasks;
6
7 namespace Implab.Formats.Json {
8 public class JsonStringScanner : JsonScanner {
9 const int _defaultBuffer = 64;
10
11 readonly string m_data;
12 int m_offset;
13
14 JsonStringScanner(string data, char[] buffer, int pos, int length, int offset) : base(buffer, pos, length) {
15 m_data = data;
16 m_offset = offset;
17 }
18
19 protected override int Read(char[] buffer, int offset, int size) {
20 if (m_data == null)
21 return 0;
22 if (m_offset >= m_data.Length)
23 return 0;
24
25 var count = Math.Min(size, m_data.Length - m_offset);
26
27 m_data.CopyTo(m_offset, buffer, offset, count);
28 m_offset += count;
29
30 return count;
31 }
32
33 public static JsonStringScanner Create(string data) {
34 Safe.ArgumentNotNull(data, nameof(data));
35
36 if (data.Length <= _defaultBuffer)
37 return new JsonStringScanner(null, data.ToCharArray(), 0, data.Length, data.Length);
38
39 var buffer = new char[_defaultBuffer];
40 data.CopyTo(0, buffer, 0, _defaultBuffer);
41 return new JsonStringScanner(data, buffer, 0, _defaultBuffer, _defaultBuffer);
42 }
43
44 public static JsonStringScanner Create(string data, int offset, int length) {
45 Safe.ArgumentNotNull(data, nameof(data));
46 Safe.ArgumentGreaterThan(offset, 0, nameof(offset));
47 Safe.ArgumentGreaterThan(length, 0, nameof(length));
48
49 if (offset + length > data.Length)
50 throw new ArgumentOutOfRangeException("Specified offset and length are out of the string bounds");
51
52 if (length <= _defaultBuffer) {
53 var buffer = new char[length];
54 data.CopyTo(offset, buffer, 0, length);
55
56 return new JsonStringScanner(null, buffer, 0, length, length);
57 } else {
58 var buffer = new char[_defaultBuffer];
59 data.CopyTo(offset, buffer, 0, _defaultBuffer);
60 return new JsonStringScanner(data, buffer, 0, _defaultBuffer, offset + _defaultBuffer);
61 }
62 }
63
64 public static JsonStringScanner Create(char[] data, int offset, int length) {
65 Safe.ArgumentNotNull(data, nameof(data));
66 Safe.ArgumentGreaterThan(offset, 0, nameof(offset));
67 Safe.ArgumentGreaterThan(length, 0, nameof(length));
68
69 if (offset + length > data.Length)
70 throw new ArgumentOutOfRangeException("Specified offset and length are out of the array bounds");
71
72 return new JsonStringScanner(null, data, offset, offset + length, offset + length);
73
74 }
75 }
76 }