private IToken TryGetDataType()
{
// Expect to either see a start of a Uri or QName
char next = Peek();
if (next == '<')
{
// Uri specified DataType
IToken temp = TryGetUri();
LastTokenType = Token.DATATYPE;
return(new DataTypeToken("<" + temp.Value + ">", temp.StartLine, temp.StartPosition, temp.EndPosition));
}
else if (Char.IsLetter(next) || UnicodeSpecsHelper.IsLetter(next) || next == '_')
{
// QName specified Data Type
IToken temp = TryGetQName();
if (temp.TokenType == Token.QNAME)
{
LastTokenType = Token.DATATYPE;
return(new DataTypeToken(temp.Value, temp.StartLine, temp.StartPosition, temp.EndPosition));
}
else
{
throw Error("Unexpected Token '" + temp.GetType().ToString() + "' was produced when a QName for a Data Type was expected!");
}
}
else
{
// Invalid Start Character
throw Error("Unexpected Character (Code " + (int)next + " " + next + "\nExpected a < to start a URI or a valid start character for a QName to specify Data Type");
}
}
private bool IsValidVarName(String value)
{
if (_isValidVarName.IsMatch(value))
{
return(true);
}
else
{
// Have to validate Character by Character
char[] cs = value.ToCharArray();
char first = cs[0];
// First character must be an underscore or letter
if (first == '_' || Char.IsLetter(first) || UnicodeSpecsHelper.IsLetter(first))
{
// Remaining Characters must be underscores, letters, numbers or hyphens
for (int i = 1; i < cs.Length; i++)
{
char c = cs[i];
if (c == '_' || c == '-' || Char.IsLetterOrDigit(c) || UnicodeSpecsHelper.IsLetterOrDigit(c))
{
// OK
}
else
{
// Invalid Character
return(false);
}
}
// If we get here it's all fine
return(true);
}
else
{
// Invalid Start Character
return(false);
}
}
}
