dAmnObj-C Packet Parser Method

gistfile1.m

-(SYPacket*)initWithString:(NSString *)string {
    if(self = [super init]) {
        // set up basic alpha char set
        NSCharacterSet *alphaCharSet = [NSCharacterSet alphanumericCharacterSet];
        
        // Retain raw packet string
        self.raw = [string copy];
        
        // Set up scanner
        NSScanner *scanner = [NSScanner scannerWithString:string];
        
        // make sure it scans everything!
        [scanner setCharactersToBeSkipped:[NSCharacterSet characterSetWithCharactersInString:@""]];
        
        // scan for command
        NSString *cmd;
        [scanner scanCharactersFromSet:alphaCharSet intoString:&cmd];
        self.command = cmd;
        
        // Check to see if its just a command packet
        if(![scanner scanString:@" " intoString:nil]) return self;
        
        // scan for parameters
        NSString *param;
        
        // scan for anything that isn't " \n\t"
        [scanner scanCharactersFromSet:[[NSCharacterSet characterSetWithCharactersInString:@" \n\t"] invertedSet]
                            intoString:&param];
        self.param = param;
        
        // Scan for Body, if double newline, everything is body
        if ([scanner scanString:@"\n\n" intoString:nil]) {
            self.body = [self.raw substringFromIndex:[scanner scanLocation]];
            return self;
        }
        
        // If no new line, end of packet
        if (![scanner scanString:@"\n" intoString:nil]) {
            return self;
        }
        
        // Set up dictionary, key and val
        NSMutableDictionary *dict = [NSMutableDictionary dictionary];
        NSString *key;
        NSString *val;
        // Sort out the args list!
        while (true) {
            // if no key, break while loop.
            if(![scanner scanCharactersFromSet:alphaCharSet intoString:&key]) break;
            
            // Scan for =
            [scanner scanString:@"=" intoString:nil];
            
            // Scan after = for the args value! scan for anything that isn't "\n"
            [scanner scanCharactersFromSet:[[NSCharacterSet characterSetWithCharactersInString:@"\n"] invertedSet]
                                intoString:&val];
            // Add to dict
            [dict setObject:val forKey:key];
            
            // Scan for new line
            [scanner scanString:@"\n" intoString:nil];
        }
        
        // Set args var to dict
        self.args = dict;
        
        if ([scanner scanString:@"\n" intoString:nil])
            self.body = [self.raw substringFromIndex:[scanner scanLocation]];
        
    }
    // return
    return self;
}