/// <summary> Returns a {@link RobotRuleSet} object which encapsulates the
/// rules parsed from the supplied <code>robotContent</code>.
/// </summary>
internal virtual RobotRuleSet ParseRules(byte[] robotContent)
{
if (robotContent == null)
{
return EMPTY_RULES;
}
System.String content = new System.String(SupportMisc.ToCharArray(robotContent));
Tokenizer lineParser = new Tokenizer(content, "\n\r");
RobotRuleSet bestRulesSoFar = null;
int bestPrecedenceSoFar = NO_PRECEDENCE;
RobotRuleSet currentRules = new RobotRuleSet();
int currentPrecedence = NO_PRECEDENCE;
bool addRules = false; // in stanza for our robot
bool doneAgents = false; // detect multiple agent lines
while (lineParser.HasMoreTokens())
{
System.String line = lineParser.NextToken();
// trim out comments and whitespace
int hashPos = line.IndexOf("#");
if (hashPos >= 0)
line = line.Substring(0, (hashPos) - (0));
line = line.Trim();
if ((line.Length >= 11) && (line.Substring(0, (11) - (0)).ToUpper().Equals("User-agent:".ToUpper())))
{
if (doneAgents)
{
if (currentPrecedence < bestPrecedenceSoFar)
{
bestPrecedenceSoFar = currentPrecedence;
bestRulesSoFar = currentRules;
currentPrecedence = NO_PRECEDENCE;
currentRules = new RobotRuleSet();
}
addRules = false;
}
doneAgents = false;
System.String agentNames = line.Substring(line.IndexOf(":") + 1);
agentNames = agentNames.Trim();
Tokenizer agentTokenizer = new Tokenizer(agentNames);
while (agentTokenizer.HasMoreTokens())
{
// for each agent listed, see if it's us:
System.String agentName = agentTokenizer.NextToken().ToLower();
object obInt = m_robotNames[agentName];
if (obInt != null)
{
int precedence = (Int32)obInt;
if ((precedence < currentPrecedence) && (precedence < bestPrecedenceSoFar))
currentPrecedence = precedence;
}
}
if (currentPrecedence < bestPrecedenceSoFar)
addRules = true;
}
else if ((line.Length >= 9) && (line.Substring(0, (9) - (0)).ToUpper().Equals("Disallow:".ToUpper())))
{
doneAgents = true;
System.String path = line.Substring(line.IndexOf(":") + 1);
path = path.Trim();
try
{
path = HttpUtility.UrlDecode(path, System.Text.Encoding.GetEncoding(CHARACTER_ENCODING.ToLower()));
}
catch (System.Exception e)
{
//LOG.warning("error parsing robots rules- can't decode path: " + path);
Trace.WriteLine("error parsing robots rules- can't decode path: " + path);
}
if (path.Length == 0)
{
// "empty rule"
if (addRules)
currentRules.ClearPrefixes();
}
else
{
// rule with path
if (addRules)
currentRules.AddPrefix(path, false);
}
}
else if ((line.Length >= 6) && (line.Substring(0, (6) - (0)).ToUpper().Equals("Allow:".ToUpper())))
{
doneAgents = true;
System.String path = line.Substring(line.IndexOf(":") + 1);
path = path.Trim();
if (path.Length == 0)
{
// "empty rule"- treat same as empty disallow
if (addRules)
currentRules.ClearPrefixes();
}
else
{
// rule with path
if (addRules)
currentRules.AddPrefix(path, true);
}
}
}
if (currentPrecedence < bestPrecedenceSoFar)
{
bestPrecedenceSoFar = currentPrecedence;
bestRulesSoFar = currentRules;
}
if (bestPrecedenceSoFar == NO_PRECEDENCE)
return EMPTY_RULES;
return bestRulesSoFar;
}
/// <summary>Returns the value of the <code>name</code> property as an array of
/// strings. If no such property is specified, then <code>null</code>
/// is returned. Values are whitespace or comma delimted.
/// </summary>
public virtual System.String[] GetStrings(System.String name)
{
System.String valueString = GetPoperty(name);
if (valueString == null)
{
return null;
}
Tokenizer tokenizer = new Tokenizer(valueString, ", \t\n\r\f");
System.Collections.IList values = new System.Collections.ArrayList();
while (tokenizer.HasMoreTokens())
{
values.Add(tokenizer.NextToken());
}
return (System.String[]) Support.ICollectionSupport.ToArray(values, new System.String[values.Count]);
}