objc2swift.io

This is a hack - need to investigate using Sourcekit http://www.jpsim.com/uncovering-sourcekit/ possibly entire code base is a bin job.

For now - the translation requires user to specify workspace / project inside Chime project this uses the clang parser.

I will simplify this so a single header / implementation file can be specified to help automate batch processing.

scheduledTask / MRWorker schema > trawler - IN PROGRESS.

TODO / Task Tracker https://docs.google.com/spreadsheets/d/1gUvHCqdPyH-yAt5W_2pmDOVsgBVtAzqfeMnoTJRTgFQ/edit#gid=738774835

Intention of project

This attached sourcecode is a stop gap until Xcode has a button to convert an objective-c project over to swift. There are potential commercial opportunities worth exploring. To discuss.

Conversion Process from Objective-C syntax to Swift

The most important first step is to run Apple's "Convert to Modern Objective-C Syntax" refactoring, so that you're using array/dictionary literals and bracket-accesses; these will then be usable in Swift.

Detected pattern	Will be Replaced by this	STATUS
Module
@interface newType : superType <protocol1, protocol2>	class newType : superType, protocol1, protocol2	OK
@implementation OR @synthesize OR @end	Delete	OK
Properties
property(…) TypeName * varName;	var varName:TypeName	OK
property (readonly...) TypeName * varName;	let varName:TypeName	OK
property(…) TypeName * IBOutlet varName;	@IBOutlet var varName:TypeName	TODO
_property	self.property
Compiler Directives
#import module.h	Obj-C modules: Include in ...-Bridging-Header.h Project modules: DeleteFrameworks: import module	OK
#define macroName value	let macroName = value	TODO
More complex#define / #ifdef / #ifndef	N/A	OK
#elif value	#elseif value	OK
#pragma mark sectionName	// MARK: sectionName (not implemented yet)	OK
NSAssert(conditon,description)	assert(condition, description)	TODO
Types
NSString *	String	TODO
NSArray * arrayName = arrayValue	let arrayName = arrayValue ORlet arrayName: Array = arrayValue OR let arrayName: TypeName[] = arrayValue	DRAFTED
NSDictionary *	Dictionary	TODO
NSMutableArray OR NSMutableDictionary ...	var arrayName...	OK
id	AnyObject	OK
TypeName *	TypeName	OK
c types, e.g. uint32 OR float	Titlecase , e.g. UInt32 or Float	OK
NSInteger OR NSUInteger	Int OR UInt	OK
Method Definitions		OK
-(void) methodName	func methodName()	OK
-(TypeName) methodName	func methodName() -> TypeName	OK
-(IBAction) methodName	@IBAction func methodName	TODO
#ERROR!	class func methodName() -> TypeName	OK
...methodName: (Type1) param1 b: (Type2) param2	...methodName(param: Type1 b param2: Typ2)	DRAFTED
method overriden from superclass	add override	TODO
Variables
TypeName varName = value	var (OR let) name = value OR var (OR let) name: TypeName if necessary	OK
Object Creation
TypeName * varName = [[TypeName alloc] init]	varName = TypeName()	OK
[[TypeName alloc] initWithA: value1 B: value2]	TypeName(a: value1, b: value2)	DRAFTED
[TypeName TypeNameWithA: value]	TypeName(a: value)	OK
Statements
break in switch statements	not necessary, except for empty cases,but add fallthrough where needed
if/while (expr)	if/while expr, parentheses optional,but expr must now be a boolean
for ( ... )	for ..., optional	TODO
Method Calls
[object method]	object.method()	OK
[object method: param1 b: param2 …]	object.method(param1, b: param2, …)	DRAFTED
Expressions
YES	TRUE	OK
NO	FALSE	OK
(TypeName) value to recast	value as TypeName OR TypeName(value)	TODO
stringName.length	stringName.utf16 ORstringName.countElements	TODO
stringName isEqualToString: string2Name	stringName == string2Name	TODO
NSString stringWithFormat@"...%@..%d",obj,int)	...(obj)...(int)	TODO
Miscellaneous
semicolons at end of line	Optionally delete	OK
@ for literals	Delete	OK

Background

Jens Alfke crafted this ruby hack with regex code https://github.com/snej/swiftier Be sure to point it to a wildcard /project/*.m files and watch it fly.

Here's a more refined hack. It's leveraging clang + and an objective-c wrapper called chime. fire it up app - point it to an existing workspace / or project and it will start processing.

Any .m files a Currently it's creating swift files -> and ripping out every comment from objective-c file. It knows your classes / methods / functions / globals. The entire sourcecode file is being parsed - and I have all the variables / methods / types at disposal thanks to sourcecodekit + clang introspection.

You can step into more detail inside SCKSyntaxHighlighter

• (NSString*)convertToSwiftSource:(SCKClangSourceFile *)file; // inside your .m file -> be sure to step through the attributes

NSLog(@"attrs:%@",attrs); NSLog(@"attributedSubstringFromRange:%@",[source attributedSubstringFromRange:range] );

There's two directions this project can take -

1. Regex pattern matching / ruby hack method in combitation with SourceCodeKit attributed string conversion

2. ChimeTranslationUnit / clang parser

Inside IndexDocument

N.B.

BOOL useClangParser = NO;
if(useClangParser){
    
  SCKSourceFile *implementation = [sourceCollection sourceFileForPath: fileURL.path]; //.m files
  NSMutableString *headerFile = [NSMutableString stringWithFormat:@"%@",fileURL.path];
  [headerFile replaceOccurrencesOfString:@".m" withString:@".h" options:0 range:NSMakeRange(0, headerFile.length)];
  SCKSourceFile *hFile = [sourceCollection sourceFileForPath: headerFile]; //.h files - 
    
}else{
    ChimeTranslationUnit *tu = [[ChimeTranslationUnit alloc] initWithFileURL:fileURL arguments:arguments index:self.index];
    if (tu == nil) {
        // TODO: provide error
        NSLog(@"Couldn't create translation unit for file \"%@\"", [fileURL path]);
    } else {
        [result addObject:tu];
    }
}


[sourceCollection.files enumerateKeysAndObjectsUsingBlock:^(NSString *key, SCKClangSourceFile *file, BOOL * __nonnull stop) {

    if ([file isKindOfClass:[SCKClangSourceFile class]]) {

        DDFileReader *reader = [[DDFileReader alloc]initWithFilePath:file.fileName];


        NSLog(@"file.fileName:%@",file.fileName);

        [reader createSwiftFileFrom:file];


       }

}];

C wrappers in clang ->

http://edgecasesshow.com/78

Obectivej-C to Swift Syntax Translation https://gist.github.com/mackworth/81e81bcc0e2dc281e1a4