public void TestRanges()
{
SeekableStringReader s = new SeekableStringReader("hello");
Assert.Throws <ParseException>(() => s.Read(-1));
Assert.AreEqual("hello", s.Read(999));
Assert.Throws <ParseException>(() => s.Read(1));
s.Rewind(int.MaxValue);
Assert.IsTrue(s.HasMore());
Assert.AreEqual("hello", s.Peek(999));
Assert.IsTrue(s.HasMore());
}
public void TestStuff()
{
using (SeekableStringReader s = new SeekableStringReader("hello"))
{
Assert.AreEqual('h', s.Peek());
Assert.AreEqual("hel", s.Peek(3));
Assert.AreEqual('h', s.Read());
Assert.AreEqual("ell", s.Read(3));
Assert.AreEqual("o", s.Peek(999));
Assert.AreEqual("o", s.Read(999));
}
using (SeekableStringReader s2 = new SeekableStringReader(" skip.\t\n\rwhitespace. "))
{
s2.SkipWhitespace();
Assert.AreEqual("skip", s2.ReadUntil('.'));
s2.SkipWhitespace();
Assert.AreEqual("whitespace", s2.ReadUntil('.'));
s2.SkipWhitespace();
Assert.IsFalse(s2.HasMore());
Assert.Throws <IndexOutOfRangeException>(() => s2.Peek());
}
}
public void TestReadUntil()
{
SeekableStringReader s = new SeekableStringReader("hello there");
s.Read();
Assert.AreEqual("ello", s.ReadUntil(' '));
Assert.AreEqual('t', s.Peek());
Assert.Throws <ParseException>(() => s.ReadUntil('x'));
Assert.AreEqual("there", s.Rest());
Assert.Throws <ParseException>(() => s.Rest());
s.Rewind(int.MaxValue);
Assert.AreEqual("hell", s.ReadUntil('x', 'y', 'z', ' ', 'o'));
Assert.Throws <ParseException>(() => s.ReadUntil('x', 'y', '@'));
}
/// <summary>
///
/// </summary>
/// <param name="rest"></param>
/// <param name="format"></param>
/// <returns></returns>
/// <exception cref="">InvalidSystemException</exception>
public static string Parse(string rest, OutputFormat format)
{
SeekableReader reader = new SeekableStringReader(rest);
bool success = System.Parse(reader, out System system);
if (!success)
{
throw new InvalidSystemException("Could not parse as a system");
}
if (reader.Peek() != -1)
{
throw new InvalidSystemException($"Saw unexpected character: {(char)reader.Read()}");
}
return(system.ToString(format));
}
private VariableNode?ReadVariableNode(SeekableStringReader reader)
{
int start = reader.NextPosition;
int c, len = 0;
while ((c = reader.Peek()) > -1 && IsValidVariableChar(c, isFirstChar: len == 0))
{
reader.Read();
len++;
}
if (len == 0)
{
errorsSink.AddError(
"There is a variable with an empty or invalid name. The valid characters are 'a-zA-Z0-9_' and the first character cannot be a number.",
start);
return(null);
}
return(new VariableNode(pattern.Substring(start, len)));
}
