public void Unread_Many()
{
var text = "abcd";
var encoding = Encoding.UTF8;
var bytes = encoding.GetBytes(text);
using (var stream = new MemoryStream(bytes))
using (var input = new PushbackInputStream(stream))
using (var textSource = new StreamTextSource(input, encoding))
{
// Arbitrarily chosen array size, but bigger than the input length
char[] buffer = new char[32];
int len = textSource.Read(buffer, 0, 3);
Assert.Equal(3, len);
Assert.Equal('a', buffer[0]);
Assert.Equal('b', buffer[1]);
Assert.Equal('c', buffer[2]);
Assert.Equal(default(char), buffer[3]);
Assert.Equal(3, input.Position);
textSource.Unread(buffer, 0, 3);
Assert.Equal(0, input.Position);
len = textSource.Read(buffer, 0, 4);
Assert.Equal(4, len);
Assert.Equal('a', buffer[0]);
Assert.Equal('b', buffer[1]);
Assert.Equal('c', buffer[2]);
Assert.Equal('d', buffer[3]);
Assert.Equal(4, input.Position);
}
}
public void Unread_One()
{
var text = "abcd";
var encoding = Encoding.UTF8;
var bytes = encoding.GetBytes(text);
using (var stream = new MemoryStream(bytes))
using (var input = new PushbackInputStream(stream))
using (var textSource = new StreamTextSource(input, encoding))
{
var a = (char)textSource.Read();
Assert.Equal('a', a);
Assert.Equal(1, input.Position);
textSource.Unread(a);
Assert.Equal(0, input.Position);
a = (char)textSource.Read();
Assert.Equal('a', a);
Assert.Equal(1, input.Position);
}
}
public void Unread_One()
{
var text = "abcd";
var encoding = Encoding.UTF8;
var bytes = encoding.GetBytes(text);
using (var stream = new MemoryStream(bytes))
using (var input = new PushbackInputStream(stream))
using (var textSource = new StreamTextSource(input, encoding))
{
var a = (char)textSource.Read();
Assert.Equal('a', a);
Assert.Equal(1, input.Position);
textSource.Unread(a);
Assert.Equal(0, input.Position);
a = (char)textSource.Read();
Assert.Equal('a', a);
Assert.Equal(1, input.Position);
}
}
public void Unread_Many()
{
var text = "abcd";
var encoding = Encoding.UTF8;
var bytes = encoding.GetBytes(text);
using (var stream = new MemoryStream(bytes))
using (var input = new PushbackInputStream(stream))
using (var textSource = new StreamTextSource(input, encoding))
{
// Arbitrarily chosen array size, but bigger than the input length
char[] buffer = new char[32];
int len = textSource.Read(buffer, 0, 3);
Assert.Equal(3, len);
Assert.Equal('a', buffer[0]);
Assert.Equal('b', buffer[1]);
Assert.Equal('c', buffer[2]);
Assert.Equal(default(char), buffer[3]);
Assert.Equal(3, input.Position);
textSource.Unread(buffer, 0, 3);
Assert.Equal(0, input.Position);
len = textSource.Read(buffer, 0, 4);
Assert.Equal(4, len);
Assert.Equal('a', buffer[0]);
Assert.Equal('b', buffer[1]);
Assert.Equal('c', buffer[2]);
Assert.Equal('d', buffer[3]);
Assert.Equal(4, input.Position);
}
}