Test app for detecting URLs with no scheme

gistfile1.m

#import <Foundation/Foundation.h>

static void test(NSString *str);

int main(int argc, char *argv[]) {
	@autoreleasepool {
		test(@"mailto:[email protected]");
		test(@"mailto:[email protected]?subject=Support%20Request&body=I%20NEED%20HELP%21");
		test(@"callto://examplesteve");
		test(@"callto:+17145551234");
		test(@"skype://examplesteve");
		test(@"skype:examplesteve");
		test(@"facetime:[email protected]");

		test(@"example.com");
		test(@"example.com/");
		test(@"example.com:8080");
		test(@"example.com:8080/");
		test(@"example.com/pathname/39150189");
		test(@"example.com/pathname/39150189?x=y&a=b");
		test(@"example.com/pathname/39150189#things");
		test(@"example.com/pathname/39150189#!ajax");
		test(@"example.com/pathname/39150189#!ajax=true&fancy=snowman");
		test(@"example.com/pathname/39150189#!ajax=true&fancy=");
		test(@"example.com/pathname/39150189#!ajax=true&fancy=☃");
		test(@":example.com");
		test(@":example.com/");
		test(@":example.com:8080");
		test(@":example.com:8080/");
		test(@":example.com/pathname/39150189");
		test(@":example.com/pathname/39150189?x=y&a=b");
		test(@":example.com/pathname/39150189#things");
		test(@":example.com/pathname/39150189#!ajax");
		test(@":example.com/pathname/39150189#!ajax=true&fancy=snowman");
		test(@":example.com/pathname/39150189#!ajax=true&fancy=");
		test(@":example.com/pathname/39150189#!ajax=true&fancy=☃");
		test(@"://example.com");
		test(@"://example.com/");
		test(@"://example.com:8080");
		test(@"://example.com:8080/");
		test(@"://example.com/pathname/39150189");
		test(@"://example.com/pathname/39150189?x=y&a=b");
		test(@"://example.com/pathname/39150189#things");
		test(@"://example.com/pathname/39150189#!ajax");
		test(@"://example.com/pathname/39150189#!ajax=true&fancy=snowman");
		test(@"://example.com/pathname/39150189#!ajax=true&fancy=");
		test(@"://example.com/pathname/39150189#!ajax=true&fancy=☃");
	}
	return EXIT_SUCCESS;
}

NSString *PRHPrefixURLStringWithHTTPButOnlyIfAppropriate(NSString *str) {
	NSString *modified = str;
	modified = [modified stringByReplacingOccurrencesOfString:@"://"
		withString:@"http://"
		options:NSAnchoredSearch
		range:(NSRange){ 0, str.length }
	];
	modified = [modified stringByReplacingOccurrencesOfString:@":"
		withString:@"http://"
		options:NSAnchoredSearch
		range:(NSRange){ 0, str.length }
	];

	NSURL *URL = [NSURL URLWithString:modified];

	if ((URL != nil) && (((URL.scheme == nil) || (URL.path == nil)) && ! ([URL.scheme isEqualToString:@"mailto"] || [URL.scheme isEqualToString:@"callto"] || [URL.scheme isEqualToString:@"skype"] || [URL.scheme isEqualToString:@"facetime"]))) {
		modified = [@"http://" stringByAppendingString:str];
	}

	return modified;
}

static void test(NSString *str) {
	NSString *modified = PRHPrefixURLStringWithHTTPButOnlyIfAppropriate(str);
	NSURL *URL = [NSURL URLWithString:modified];

	NSLog(@"%p! %@-> %@ :// %@ : %@ @ %@ :%@ %@ ?%@\n-> %@", URL, str, URL.scheme, URL.user, URL.password, URL.host, URL.port, URL.path, URL.query, modified);
}