/// <summary>
///
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
public static ABNF_Rule Parse(string value)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
string[] name_value = value.Split(new char[] { '=' }, 2);
if (name_value.Length != 2)
{
throw new ParseException("Invalid ABNF rule '" + value + "'.");
}
ABNF_Rule retVal = new ABNF_Rule(name_value[0].Trim(), ABNF_Alternation.Parse(new System.IO.StringReader(name_value[1])));
return(retVal);
}
/// <summary>
///
/// </summary>
/// <param name="reader"></param>
/// <returns></returns>
public static ABNF_Option Parse(System.IO.StringReader reader)
{
if (reader == null)
{
throw new ArgumentNullException("reader");
}
// option = "[" *c-wsp alternation *c-wsp "]"
if (reader.Peek() != '[')
{
throw new ParseException("Invalid ABNF 'option' value '" + reader.ReadToEnd() + "'.");
}
// Eat "[".
reader.Read();
// TODO: *c-wsp
ABNF_Option retVal = new ABNF_Option();
// We reached end of stream, no closing "]".
if (reader.Peek() == -1)
{
throw new ParseException("Invalid ABNF 'option' value '" + reader.ReadToEnd() + "'.");
}
retVal.m_pAlternation = ABNF_Alternation.Parse(reader);
// We don't have closing ")".
if (reader.Peek() != ']')
{
throw new ParseException("Invalid ABNF 'option' value '" + reader.ReadToEnd() + "'.");
}
else
{
reader.Read();
}
return(retVal);
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="name">Rule name.</param>
/// <param name="elements">Alternation elements.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>name</b> or <b>elements</b> is null reference.</exception>
/// <exception cref="ArgumentException">Is raised when any of the arguments has invalid value.</exception>
public ABNF_Rule(string name, ABNF_Alternation elements)
{
if (name == null)
{
throw new ArgumentNullException("name");
}
if (name == string.Empty)
{
throw new ArgumentException("Argument 'name' value must be specified.");
}
if (!ValidateName(name))
{
throw new ArgumentException("Invalid argument 'name' value. Value must be 'rulename = ALPHA *(ALPHA / DIGIT / \"-\")'.");
}
if (elements == null)
{
throw new ArgumentNullException("elements");
}
m_Name = name;
m_pElements = elements;
}
/// <summary>
///
/// </summary>
/// <param name="reader"></param>
/// <returns></returns>
public static ABNF_Alternation Parse(System.IO.StringReader reader)
{
if (reader == null)
{
throw new ArgumentNullException("reader");
}
// alternation = concatenation *(*c-wsp "/" *c-wsp concatenation)
ABNF_Alternation retVal = new ABNF_Alternation();
while (true)
{
ABNF_Concatenation item = ABNF_Concatenation.Parse(reader);
if (item != null)
{
retVal.m_pItems.Add(item);
}
// We reached end of string.
if (reader.Peek() == -1)
{
break;
}
// We have next alternation item.
else if (reader.Peek() == '/')
{
reader.Read();
}
// We have unexpected value, probably alternation ends.
else
{
break;
}
}
return(retVal);
}