private static bool CheckMatch(ParameterInfo param, StringIterator inputIterator, StringIterator signatureIterator, out object result)
{
//Get the type of the parameter
Type paramType = param.ParameterType;
//Check for integer numbers
if (IsInteger(paramType))
{
//Read the integer
return(ReadInteger(paramType, inputIterator, out result));
}
//Check for floating point numbers
if (IsFloatingPoint(paramType))
{
//Read the floating point
return(ReadFloatingPoint(paramType, inputIterator, out result));
}
//Check for string
if (IsString(paramType))
{
//Get the pattern for the regex
var pattern = param.GetCustomAttribute <RegexParameterAttribute>().Pattern;
//Check what is expected after our string
var ch = signatureIterator.Peek(2);
int offset = (ch.HasValue) ? inputIterator.Find(ch.Value) : 0;
//If the input does not have the expected character we
//continue anyway. The match will fail after this.
if (offset < 0)
{
offset = 0;
}
//Read the string
return(ReadString(pattern, inputIterator, offset, out result));
}
//We do not recognize the type
throw new Exception($"Unknown type {param.ParameterType.Name}!");
}
public static List <CommandMatch> ProcessCommand(CommandModuleBase module, string inputString)
{
//Prepare a list to hold our candidates
var candidates = new List <CommandMatch>();
//Go through each command in the module
module.Commands.ForEach(cmd =>
{
//Grab the signature to match
var signature = CommandManager.GetCommandSignature(cmd);
//Prepare our iterators
var inputIterator = new StringIterator(inputString);
var signatureIterator = new StringIterator(signature);
//Prepare candidate
var paramInfo = cmd.GetParameters();
var candidate = new CommandMatch
{
module = module,
cmd = cmd,
inputMatch = 0,
signatureMatch = 0,
signatureLength = signature.Length,
extractedParams = new object[paramInfo.Length],
count = 1
};
//Iterate through the strings
while (true)
{
//Check for valid iterators
if (!inputIterator.Current().HasValue || !signatureIterator.Current().HasValue)
{
break;
}
//Get the next characters
var ch1 = inputIterator.Current().Value;
var ch2 = signatureIterator.Current().Value;
//Check if we hit a whitespace character in the signature
if (char.IsWhiteSpace(ch2))
{
//Check that the input string has at least one whitespace
if (char.IsWhiteSpace(ch1))
{
//Skip the whitespace
inputIterator.SkipWhitespace();
signatureIterator.SkipWhitespace();
//Continue without advancing iterators
continue;
}
else
{
break;
}
}
//Check if we reached a parameter
if ((ch2 == '{') && (signatureIterator.Peek() == '}'))
{
//Skip any whitespace before our parameter
inputIterator.SkipWhitespace();
//Try to match the input against our expected parameter
if (CheckMatch(paramInfo[candidate.count], inputIterator, signatureIterator, out object result))
{
//Store the result
candidate.extractedParams[candidate.count++] = result;
//Skip over the brackets in the signature
signatureIterator.Skip();
signatureIterator.Skip();
//Check if the signature is not explicitly requiring a whitespace
var tmp = signatureIterator.Current();
if (tmp.HasValue && !char.IsWhiteSpace(tmp.Value))
{
//Allow optional whitespace which we skip
inputIterator.SkipWhitespace();
}
//Continue without advancing iterators
continue;
}
break;
}
//Normal case-insensitive string comparison
if (char.ToLowerInvariant(ch1) != char.ToLowerInvariant(ch2))
{
break;
}
//Advance our iterators
inputIterator.Next();
signatureIterator.Next();
}
//Update how much we matched of the input and signature
candidate.inputMatch = inputIterator.Index;
candidate.signatureMatch = signatureIterator.Index;
//Push candidate into list
candidates.Add(candidate);
});
//Return the candidates
return(candidates);
}
