private static XDoc FromXml(TextReader reader)
{
// check if reader is a StringReader, so that we can use an optimized trimming reader for it
if (!reader.IsTrimmingReader())
{
reader = new TrimmingTextReader(reader);
}
// check if stream is either empty or does not start with a legal symbol
int peek = reader.Peek();
if ((peek == -1) || (peek != '<'))
{
return(XDoc.Empty);
}
try {
XmlDocument doc = XDoc.NewXmlDocument();
doc.Load(reader);
if (doc.DocumentElement == null)
{
return(XDoc.Empty);
}
return(new XDoc(doc));
} catch {
return(XDoc.Empty);
}
}
public void Trim_both_the_beginning_and_end()
{
TextReader reader = new StringReader(" this is plain text ");
reader = new TrimmingTextReader(reader);
string result = reader.ReadToEnd();
Assert.AreEqual("this is plain text", result);
}
public void Nothing_to_trim()
{
TextReader reader = new StringReader("this is plain text");
reader = new TrimmingTextReader(reader);
string result = reader.ReadToEnd();
Assert.AreEqual("this is plain text", result);
}
public void Trim_both_the_beginning_and_end_via_readbuffer()
{
TextReader reader = new StringReader(" this is plain text ");
reader = new TrimmingTextReader(reader);
var buffer = new char[1024];
var read = reader.Read(buffer, 0, buffer.Length);
var result = new StringBuilder();
result.Append(buffer, 0, read);
Assert.AreEqual("this is plain text", result.ToString());
}
public void Readbuffer_in_multiple_attempts_with_more_whitespace_than_buffersize_trailing()
{
var text = "this is some text ";
var reader = new TrimmingTextReader(new StringReader(text));
var result = new StringBuilder();
var buffer = new char[1024];
var read = reader.Read(buffer, 0, 24);
var total = read;
Assert.AreEqual('t', buffer[0]);
read = reader.Read(buffer, read, buffer.Length);
total += read;
result.Append(buffer, 0, total);
Assert.AreEqual("this is some text", result.ToString());
}
public void Readbuffer_in_multiple_attempts_with_whitespace_between_chunks()
{
var text = " this is some text with lots of whitespace in the middle ";
var reader = new TrimmingTextReader(new StringReader(text));
var result = new StringBuilder();
var buffer = new char[1024];
var read = reader.Read(buffer, 0, 24);
var total = read;
Assert.AreEqual(24, read);
Assert.AreEqual('t', buffer[0]);
read = reader.Read(buffer, read, buffer.Length);
total += read;
result.Append(buffer, 0, total);
Assert.AreEqual("this is some text with lots of whitespace in the middle", result.ToString());
}
public void Trimming_reader_retries_against_stream_when_request_bytes_are_not_met()
{
var stream = new MockStream();
using (var reader = new TrimmingTextReader(new StreamReader(stream, Encoding.ASCII))) {
var buffer = new char[4000];
var total = 0;
while (total < buffer.Length)
{
var read = reader.Read(buffer, total, buffer.Length - total);
_log.DebugFormat("requested {0}, got {1}", buffer.Length - total, read);
Assert.IsTrue(read > 0);
total += read;
}
}
}
