private static bool ReadFloatingPoint(Type expectedType, StringIterator inputIterator, out object result)
{
//Prepare a simple regex
var regex = new Regex(@"^[+-]?\d+(\.\d+)?");
//Send it to our iterator
var number = inputIterator.ReadRegex(regex);
//Setup the style and culture for parsing the float
var style = NumberStyles.AllowLeadingSign | NumberStyles.AllowDecimalPoint;
var format = CultureInfo.InvariantCulture.NumberFormat;
//Get the appropriate parser based on type
switch (Type.GetTypeCode(expectedType))
{
case TypeCode.Single: { bool e = Single.TryParse(number, style, format, out Single tmp); result = tmp; return(e); }
case TypeCode.Double: { bool e = Double.TryParse(number, style, format, out Double tmp); result = tmp; return(e); }
case TypeCode.Decimal: { bool e = Decimal.TryParse(number, style, format, out Decimal tmp); result = tmp; return(e); }
}
//Should never reach this
throw new Exception("Hit unreachable code.");
}
private static bool ReadInteger(Type expectedType, StringIterator inputIterator, out object result)
{
//Prepare a simple regex
var regex = new Regex(@"^[+-]?\d+");
//Send it to our iterator
var number = inputIterator.ReadRegex(regex);
//Setup the style and culture for parsing the float
var style = NumberStyles.AllowLeadingSign;
var format = CultureInfo.InvariantCulture.NumberFormat;
//Get the appropriate parser based on type
switch (Type.GetTypeCode(expectedType))
{
case TypeCode.Byte: { bool e = Byte.TryParse(number, style, format, out Byte tmp); result = tmp; return(e); }
case TypeCode.SByte: { bool e = SByte.TryParse(number, style, format, out SByte tmp); result = tmp; return(e); }
case TypeCode.UInt16: { bool e = UInt16.TryParse(number, style, format, out UInt16 tmp); result = tmp; return(e); }
case TypeCode.UInt32: { bool e = UInt32.TryParse(number, style, format, out UInt32 tmp); result = tmp; return(e); }
case TypeCode.UInt64: { bool e = UInt64.TryParse(number, style, format, out UInt64 tmp); result = tmp; return(e); }
case TypeCode.Int16: { bool e = Int16.TryParse(number, style, format, out Int16 tmp); result = tmp; return(e); }
case TypeCode.Int32: { bool e = Int32.TryParse(number, style, format, out Int32 tmp); result = tmp; return(e); }
case TypeCode.Int64: { bool e = Int64.TryParse(number, style, format, out Int64 tmp); result = tmp; return(e); }
}
//Should never reach this
throw new Exception("Hit unreachable code.");
}
private static bool ReadString(string pattern, StringIterator inputIterator, int limit, out object result)
{
//Prepare the regex
var regex = new Regex(pattern);
//Send it to our iterator
var tmp = inputIterator.ReadRegex(regex, limit);
result = tmp;
//Check that it's not null or empty
return(!string.IsNullOrWhiteSpace(tmp));
}
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);
}
