nodestyle.m

- (FJSValue*)evaluateModuleAtURL:(NSURL*)scriptURL {
    
    if (scriptURL) {
        NSError *error;
        NSString *script = [NSString stringWithContentsOfURL:scriptURL encoding:NSUTF8StringEncoding error:&error];
        
        if (script) {

#define NODE_STYLE_WRAPPER 1
#ifdef NODE_STYLE_WRAPPER
            
            NSString *moduleWrapper = @"(function(__filename, __dirname) {\nvar module = { exports : {} }; var exports = module.exports;\n%@;\nreturn module.exports;})";
            
            moduleWrapper = [NSString stringWithFormat:moduleWrapper, script];
            
            FJSValue *moduleValueFunction  = [self evaluateNoQueue:moduleWrapper withSourceURL:scriptURL];
            
            FJSValue *moduleValue = [moduleValueFunction callWithArguments:@[[scriptURL path], [[scriptURL URLByDeletingLastPathComponent] path]]];
            
#else
            
            id fn = self[@"__filename"];
            id dn = self[@"__dirname"];
            
            // __filename and __dirname are node things. I wish we could pass them in as arguments, but I can't seem to massage the js so that'll happen.
            self[@"__filename"] = [scriptURL path];
            self[@"__dirname"]  = [[scriptURL URLByDeletingLastPathComponent] path];
            
            NSString *module = [NSString stringWithFormat:@"(function() { var module = { exports : {} }; var exports = module.exports; %@;\nreturn module.exports; })()", script];
            
            FJSValue *moduleValue = [self evaluateNoQueue:module withSourceURL:scriptURL];
            
            self[@"__filename"] = [fn isUndefined] || [fn isNull] ? nil : fn;
            self[@"__dirname"]  = [dn isUndefined] || [dn isNull] ? nil : dn;
#endif
            return moduleValue;
        }
        else if (error) {
            @throw [NSException exceptionWithName:NSInvalidArgumentException reason:[NSString stringWithFormat:@"Cannot find module %@", scriptURL.path] userInfo:nil];
        }
    }
    
    return nil;
}