public void AddRule(ArgRule r)
{
Rules.Add(r);
}
public string Parse(string[] args)
{
string lastToken = "";
string ruleViolation = "";
foreach (string arg in args)
{
string argName = "";
if (arg.StartsWith("-") || arg.StartsWith("/"))
{
string[] parts = null;
argName = arg.Substring(1); // strip leading - or /
//
// process lastToken, if it has a value
//
if (lastToken.Length > 0)
{
if (lastToken.StartsWith("-") || lastToken.StartsWith("/"))
{
ruleViolation = AddArg(lastToken.Substring(1), ""); // switch with no arguments
}
else
{
ruleViolation = AddArg("", lastToken); // switch-less argument
}
if (ruleViolation != "")
{
return(ruleViolation);
}
lastToken = "";
}
//
// does the switch have a value in the same arg ???
//
if (argName.Contains(":") || argName.Contains("="))
{
parts = argName.Split(new char[] { ':', '=' }, 2);
ruleViolation = AddArg(parts[0], parts[1]); // switch with argument separated by : or =
if (ruleViolation != "")
{
return(ruleViolation);
}
}
else
{
lastToken = arg; // switch - argument may be in next arg - wait for next iteration
}
}
else // switchless argument - process lastToken
{
if (lastToken.Length > 0)
{
if (lastToken.StartsWith("-") || lastToken.StartsWith("/"))
{
//
// Should the switch take an argument?
//
lastToken = lastToken.Substring(1); // trim - or /
ArgRule r = GetArgRule(lastToken);
if (r.fHasValue)
{
ruleViolation = AddArg(lastToken, arg); // switch with value in next argument
if (ruleViolation != "")
{
return(ruleViolation);
}
lastToken = "";
}
else
{
ruleViolation = AddArg(lastToken, ""); // switch takes no arguments, promote arg to lastToken
if (ruleViolation != "")
{
return(ruleViolation);
}
lastToken = arg;
}
}
else
{
ruleViolation = AddArg("", lastToken); // switch-less argument
if (ruleViolation != "")
{
return(ruleViolation);
}
lastToken = "";
}
}
else
{
lastToken = arg;
}
}
}
//
// Process lastToken if one exists
//
if (lastToken.Length > 0)
{
if (lastToken.StartsWith("-") || lastToken.StartsWith("/"))
{
ruleViolation = AddArg(lastToken.Substring(1), ""); // switch takes no arguments, promote arg to lastToken
if (ruleViolation != "")
{
return(ruleViolation);
}
}
else
{
ruleViolation = AddArg("", lastToken); // switch-less argument
if (ruleViolation != "")
{
return(ruleViolation);
}
}
}
if (ruleViolation != "")
{
return(ruleViolation);
}
//
// Evaluate missing required switches
//
foreach (ArgRule r in Rules)
{
if (r.fMustAppear && (GetArgs(r.name).Count == 0))
{
if (r.name == "")
{
return(@"Required value is missing.");
}
else
{
return(@"Required switch " + r.name + " is missing.");
}
}
}
return("");
}
private string AddArg(string name, string value)
{
// check rules
ArgRule r = GetArgRule(name);
if (r == null && name == "")
{
return(@"Invalid argument: " + value);
}
if (r == null)
{
return(@"Invalid switch: " + name);
}
if (r.fInsensitive)
{
name = name.ToLower();
}
if (r.fDuplicates == false)
{
if (GetArgs(name).Count > 0)
{
if (name == "")
{
return(@"A switch-less value can only appear once.");
}
else
{
return(@"Switch " + name + " can only appear once.");
}
}
}
if (r.fHasValue == false)
{
if (value != "")
{
return(@"Switch " + name + " does not take an argument.");
}
}
if (r.fHasValue == true)
{
if (value == "")
{
return(@"Switch " + name + " requires an argument.");
}
}
//
// if fall through, we add the argument
//
if (value == "")
{
value = "true";
}
CommandLineArgs a = new CommandLineArgs();
a.name = name;
a.value = value;
Args.Add(a);
return("");
}