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using System;
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using System.Collections.Generic;
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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.Formats.Json {
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public class JsonStringScanner : JsonScanner {
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const int _defaultBuffer = 64;
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readonly string m_data;
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int m_offset;
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JsonStringScanner(string data, char[] buffer, int pos, int length, int offset) : base(buffer, pos, length) {
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m_data = data;
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m_offset = offset;
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}
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protected override int Read(char[] buffer, int offset, int size) {
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if (m_data == null)
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return 0;
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if (m_offset >= m_data.Length)
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return 0;
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var count = Math.Min(size, m_data.Length - m_offset);
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m_data.CopyTo(m_offset, buffer, offset, count);
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m_offset += count;
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return count;
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}
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public static JsonStringScanner Create(string data) {
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Safe.ArgumentNotNull(data, nameof(data));
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if (data.Length <= _defaultBuffer)
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return new JsonStringScanner(null, data.ToCharArray(), 0, data.Length, data.Length);
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var buffer = new char[_defaultBuffer];
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data.CopyTo(0, buffer, 0, _defaultBuffer);
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return new JsonStringScanner(data, buffer, 0, _defaultBuffer, _defaultBuffer);
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}
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public static JsonStringScanner Create(string data, int offset, int length) {
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Safe.ArgumentNotNull(data, nameof(data));
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Safe.ArgumentGreaterThan(offset, 0, nameof(offset));
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Safe.ArgumentGreaterThan(length, 0, nameof(length));
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if (offset + length > data.Length)
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throw new ArgumentOutOfRangeException("Specified offset and length are out of the string bounds");
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if (length <= _defaultBuffer) {
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var buffer = new char[length];
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data.CopyTo(offset, buffer, 0, length);
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return new JsonStringScanner(null, buffer, 0, length, length);
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} else {
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var buffer = new char[_defaultBuffer];
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data.CopyTo(offset, buffer, 0, _defaultBuffer);
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return new JsonStringScanner(data, buffer, 0, _defaultBuffer, offset + _defaultBuffer);
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}
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}
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public static JsonStringScanner Create(char[] data, int offset, int length) {
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Safe.ArgumentNotNull(data, nameof(data));
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Safe.ArgumentGreaterThan(offset, 0, nameof(offset));
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Safe.ArgumentGreaterThan(length, 0, nameof(length));
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if (offset + length > data.Length)
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throw new ArgumentOutOfRangeException("Specified offset and length are out of the array bounds");
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return new JsonStringScanner(null, data, offset, offset + length, offset + length);
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}
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}
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}
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