JsonStringScanner.cs
76 lines
| 2.8 KiB
| text/x-csharp
|
CSharpLexer
cin
|
r230 | using System; | ||
| using System.Collections.Generic; | ||||
| using System.Linq; | ||||
| using System.Text; | ||||
| using System.Threading.Tasks; | ||||
| namespace Implab.Formats.Json { | ||||
| public class JsonStringScanner : JsonScanner { | ||||
| const int _defaultBuffer = 64; | ||||
| readonly string m_data; | ||||
| int m_offset; | ||||
| JsonStringScanner(string data, char[] buffer, int pos, int length, int offset) : base(buffer, pos, length) { | ||||
| m_data = data; | ||||
| m_offset = offset; | ||||
| } | ||||
| protected override int Read(char[] buffer, int offset, int size) { | ||||
| if (m_data == null) | ||||
| return 0; | ||||
| if (m_offset >= m_data.Length) | ||||
| return 0; | ||||
| var count = Math.Min(size, m_data.Length - m_offset); | ||||
| m_data.CopyTo(m_offset, buffer, offset, count); | ||||
| m_offset += count; | ||||
| return count; | ||||
| } | ||||
| public static JsonStringScanner Create(string data) { | ||||
| Safe.ArgumentNotNull(data, nameof(data)); | ||||
| if (data.Length <= _defaultBuffer) | ||||
| return new JsonStringScanner(null, data.ToCharArray(), 0, data.Length, data.Length); | ||||
| var buffer = new char[_defaultBuffer]; | ||||
| data.CopyTo(0, buffer, 0, _defaultBuffer); | ||||
| return new JsonStringScanner(data, buffer, 0, _defaultBuffer, _defaultBuffer); | ||||
| } | ||||
| public static JsonStringScanner Create(string data, int offset, int length) { | ||||
| Safe.ArgumentNotNull(data, nameof(data)); | ||||
| Safe.ArgumentGreaterThan(offset, 0, nameof(offset)); | ||||
| Safe.ArgumentGreaterThan(length, 0, nameof(length)); | ||||
| if (offset + length > data.Length) | ||||
| throw new ArgumentOutOfRangeException("Specified offset and length are out of the string bounds"); | ||||
| if (length <= _defaultBuffer) { | ||||
| var buffer = new char[length]; | ||||
| data.CopyTo(offset, buffer, 0, length); | ||||
| return new JsonStringScanner(null, buffer, 0, length, length); | ||||
| } else { | ||||
| var buffer = new char[_defaultBuffer]; | ||||
| data.CopyTo(offset, buffer, 0, _defaultBuffer); | ||||
| return new JsonStringScanner(data, buffer, 0, _defaultBuffer, offset + _defaultBuffer); | ||||
| } | ||||
| } | ||||
| public static JsonStringScanner Create(char[] data, int offset, int length) { | ||||
| Safe.ArgumentNotNull(data, nameof(data)); | ||||
| Safe.ArgumentGreaterThan(offset, 0, nameof(offset)); | ||||
| Safe.ArgumentGreaterThan(length, 0, nameof(length)); | ||||
| if (offset + length > data.Length) | ||||
| throw new ArgumentOutOfRangeException("Specified offset and length are out of the array bounds"); | ||||
| return new JsonStringScanner(null, data, offset, offset + length, offset + length); | ||||
| } | ||||
| } | ||||
| } | ||||