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Re: Objective-C - Smalltalk bridge

From: Marcel Weiher
Subject: Re: Objective-C - Smalltalk bridge
Date: Sat, 21 May 2005 13:38:49 +0100

On 12 May 2005, at 23:37, Stefan Urbanek wrote:

Issues I had:
- the bridge requires readline and ncurses - can be that eliminated
- the program ended on Smalltalk readline
- how can I get ObjC proxy for a Smalltalk object? I was not able to say
anything about a result of an execution. I want to do someting like:

    Smalltalk        *smalltalk; /* say this exists */
    NSMutableArray   *array; /* this exists too */
    result = [smalltalk execute:@"1+1"];
    [array addObject:result];
    NSLog(@"Added number %i", [result intValue]);

Also ... how can I reference ObjectiveC objects from Smalltalk? Would it
be possible to give more examples?

With Objective-Smalltalk, you get that, but without a bridge or proxies:

address@hidden > stexec.m
#import <MPWTalk/MPWStCompiler.h>

int main( int argc, char *argv[] ) {
    id pool = [NSAutoreleasePool new];
    id eval = [MPWStCompiler new];
    id result = [eval evaluate:@"1+1."];
    NSLog(@"result: %d",[result intValue]);
    return 0;
address@hidden -O -Wall -o stexec stexec.m -framework MPWTalk - framework MPWFoundation -framework Foundation
stexec.m: In function 'main':
stexec.m:4: warning: unused variable 'pool'
2005-05-21 13:11:34.516 stexec[714] result: 2

What is Objective-Smalltalk? In a nutshell: a Smalltalk syntax for the Objective-C runtime + language semantics. So there are no proxies and no two runtimes that have to talk to each other. This allows Objective-ST to be very compact, currently only around 1.5 KLOC, with several hundred of those being the unit tests. That includes a basic compiler/interpreter (compiler for the syntax, 'interpreter' for running the returned Objective-C objects that represent a script/method) ready for integration. It is still early days, but good enough to use in some of my shipping products.

I am currently working on a (very primitive) little method browser:

PNG image

Another part: stsh, a smalltalk shell, both for interactive and scripting use.

> 3 + 4
> last * 6
> theAnswer := last
> theAnswer class
> context scanner setIntClass:NSDecimalNumber
> 1 class

--------------  pdfdump.stsh ---------------
filename := args objectAtIndex:1
stdout print: 'pdfdump of: '
stdout println: filename

data := NSData dataWithContentsOfMappedFile: filename
pdf := (MPWPDFFile alloc initWithPdfData:data ) autorelease
pages := pdf pages
stdout writeObject: pages count
stdout println: ' pages'

stdout writeObject:pages

contentStreams := pages collect contentStreams
allStreams := contentStreams collect lastObject
allContent := allStreams collect stringValue
stdout println: 'got allContent'
stdout writeObject:allContent
---------------  pdfdump.stsh -------------------

In the works: a gcc front end, though that is *quite* a struggle. Doing a JIT might be simpler... :-(



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