Cocoa/Objective-C中的简单字符串解析:将命令行解析为命令和参数

#import<Foundation/Foundation.h>

@interface CommandLineParser : NSObject

+ (void)parseCommandLine:(NSString *)commandLine;

@end

@implementation CommandLineParser

+ (void)parseCommandLine:(NSString *)commandLine {
    NSArray *arguments = [self.class splitArguments:commandLine];
    NSString *command = arguments[0];
    NSArray *params = [arguments subarrayWithRange:NSMakeRange(1, arguments.count - 1)];

    NSLog(@"Command: %@", command);
    NSLog(@"Parameters: %@", params);
}

+ (NSArray *)splitArguments:(NSString *)commandLine {
    NSMutableArray *arguments = [NSMutableArray new];
    NSMutableString *currentArgument = [NSMutableString new];
    BOOL inQuotes = NO;

    for (NSUInteger i = 0; i< commandLine.length; i++) {
        unichar c = [commandLine characterAtIndex:i];

        if (c == '\"') {
            inQuotes = !inQuotes;
        } else if (c == ' ' && !inQuotes) {
            if (currentArgument.length > 0) {
                [arguments addObject:currentArgument];
                [currentArgument setString:@""];
            }
        } else {
            [currentArgument appendFormat:@"%C", c];
        }
    }

    if (currentArgument.length > 0) {
        [arguments addObject:currentArgument];
    }

    return arguments;
}

@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSString *commandLine = @"command \"param1 param2\" param3";
        [CommandLineParser parseCommandLine:commandLine];
    }
    return 0;
}