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Lua and multi-paradigm programming: scope and capabilities

- by Ef Es

Despite having started learning programming with Pascal and C, after the jump to OO (C++, Java) I lost sense of the structured programming paradigm. I have started learning Lua and I have researched many tutorials, but all of them only cover basic operations and language features and capabilities. They feel more like a reference doc than a programmer's guide. Now, when trying to work with day to day tasks, how does one go through most common design patterns like observer, or multithreaded programming, creating UI elements and polling system calls for keyboard or sensors? Is it even feasible in this languages or you have to work with the C binding, libraries and low-level programming to get most stuff done? Do I get the Lua scope wrong?

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IPv6 scope id issue with IE

- by eych

I have an ASP.NET website that works with Firefox because FF doesn't need the % in the scope-id to be encoded (%25). The website also works on the same machine using IE because I can leave out the scope-id. However, to access the website from another machine in the network, I need to add the scope-id to the IPv6 address. For some reason, using the scope-id doesn't allow an authentication cookie to be created, and the website keeps going back to the login page. Anyone using IE7+ to access an ASP.NET website on a network using IPv6 with an encoded %?

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Why "scope link" ipv6 address can be pinged via interfaces which they are not active on

- by olagu

[root@2_01 ~]# /sbin/ip -6 addr show pubeth0 inet6 2001:1::6/64 scope global inet6 2001:1::1/64 scope global inet6 fe80::20c:29ff:fe69:f9e8/64 scope link [root@v2_01 ~]# /sbin/ip -6 addr show pubeth1 inet6 fe80::20c:29ff:fe69:f906/64 scope link [root@2_01 ~]# ping6 fe80::20c:29ff:fe69:f9e8%pubeth1 PING fe80::20c:29ff:fe69:f9e8%pubeth1(fe80::20c:29ff:fe69:f9e8) 56 data bytes 64 bytes from fe80::20c:29ff:fe69:f9e8: icmp_seq=1 ttl=64 time=0.259 ms --- fe80::20c:29ff:fe69:f9e8%pubeth1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 286ms rtt min/avg/max/mdev = 0.259/0.259/0.259/0.000 ms [root@2_01 ~]# ping6 fe80::20c:29ff:fe69:f9e8%pubeth0 PING fe80::20c:29ff:fe69:f9e8%pubeth0(fe80::20c:29ff:fe69:f9e8) 56 data bytes 64 bytes from fe80::20c:29ff:fe69:f9e8: icmp_seq=1 ttl=64 time=0.057 ms --- fe80::20c:29ff:fe69:f9e8%pubeth0 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 390ms rtt min/avg/max/mdev = 0.057/0.057/0.057/0.000 ms Why can I ping6 "fe80::20c:29ff:fe69:f9e8" via pubeth1?

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ngModel and component with isolated scope

- by Artem Andreev

I am creating simple ui-datetime directive. It splits javascript Date object into _date, _hours and _minutes parts. _date uses jquery ui datepicker, _hours and _minutes - number inputs. See example: http://jsfiddle.net/andreev_artem/nWsZp/3/ On github: https://github.com/andreev-artem/angular_experiments/tree/master/ui-datetime As far as I understand - best practice when you create a new component is to use isolated scope. When I tried to use isolated scope - nothing works. ngModel.$viewValue === undefined. When I tried to use new scope (my example, not so good variant imho) - ngModel uses value on newly created scope. Of course I can create directive with isolated scope and work with ngModel value through "=expression" (example). But I think that working with ngModelController is a better practice. My questions: Can I use ngModelController with isolated scope? If it is not possible which solution is better for creating such component?

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Vew not updating after scope update

- by bsparacino

Here is a very simple example of what I am trying to do Athlete.save(athlete,function(result) { $scope.athlete = result.athlete; }); The issue is that the $scope.athlete variable does not update in my view. In order to get it to update I have to do this Athlete.save(athlete,function(result) { $scope.athlete.fname = result.athlete.fname; $scope.athlete.lname= result.athlete.lname; $scope.athlete.gender= result.athlete.gender; .... }); This gets annoying very quickly. With the first block of code it's as if angular does not know that my $scope.athlete variable has been updated. This function is triggered from an ng-click, not some jquery call, I am doing it the angular way as far as I know. here is a simpler case I made: http://plnkr.co/edit/lMCPbzqDOoa5K4GXGhCp

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Why does this Rails named scope return empty (uninitialized?) objects?

- by mipadi

In a Rails app, I have a model, Machine, that contains the following named scope: named_scope :needs_updates, lambda { { :select => self.column_names.collect{|c| "\"machines\".\"#{c}\""}.join(','), :group => self.column_names.collect{|c| "\"machines\".\"#{c}\""}.join(','), :joins => 'LEFT JOIN "machine_updates" ON "machine_updates"."machine_id" = "machines"."id"', :having => ['"machines"."manual_updates" = ? AND "machines"."in_use" = ? AND (MAX("machine_updates"."date") IS NULL OR MAX("machine_updates"."date") < ?)', true, true, UPDATE_THRESHOLD.days.ago] } } This named scope works fine in development mode. In production mode, however, it returns the 2 models as expected, but the models are empty or uninitialized; that is, actual objects are returned (not nil), but all the fields are nil. For example, when inspecting the return value of the named scope in the console, the following is returned: [#<Machine >, #<Machine >] But, as you can see, all the fields of the objects returned are set to nil. The production and development environments are essentially the same. Both are using a SQLite database. Any ideas what's going wrong?

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Why aren't variables declared in "try" in scope in "catch" or "finally"?

- by Jon Schneider

In C# and in Java (and possibly other languages as well), variables declared in a "try" block are not in scope in the corresponding "catch" or "finally" blocks. For example, the following code does not compile: try { String s = "test"; // (more code...) } catch { Console.Out.WriteLine(s); //Java fans: think "System.out.println" here instead } In this code, a compile-time error occurs on the reference to s in the catch block, because s is only in scope in the try block. (In Java, the compile error is "s cannot be resolved"; in C#, it's "The name 's' does not exist in the current context".) The general solution to this issue seems to be to instead declare variables just before the try block, instead of within the try block: String s; try { s = "test"; // (more code...) } catch { Console.Out.WriteLine(s); //Java fans: think "System.out.println" here instead } However, at least to me, (1) this feels like a clunky solution, and (2) it results in the variables having a larger scope than the programmer intended (the entire remainder of the method, instead of only in the context of the try-catch-finally). My question is, what were/are the rationale(s) behind this language design decision (in Java, in C#, and/or in any other applicable languages)?

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Case Management In-Depth: Cases & Case Activities Part 1 – Activity Scope by Mark Foster

- by JuergenKress

In the previous blog entry we looked at stakeholders and permissions, i.e. how we control interaction with the case and its artefacts. In this entry we’ll look at case activities, specifically how we decide their scope, in the next part we’ll look at how these activities relate to the over-arching case and how we can effectively visualize the relationship between the case and its activities. Case Activities As mentioned in an earlier blog entry, case activities can be created from: BPM processes Human Tasks Custom (Java Code) It is pretty obvious that we would use custom case activities when either: we already have existing code that we would like to form part of a case we cannot provide the necessary functionality with a BPM process or simple Human Task However, how do we determine what our BPM process as a case activity contains? What level of granularity? Take the following simple BPM process Read the full article here. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Mix Forum Technorati Tags: ACM,BPM,Mark Foster,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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'Lexical' scoping of type parameters in C#

- by leppie

I have 2 scenarios. This fails: class F<X> { public X X { get; set; } } error CS0102: The type 'F' already contains a definition for 'X' This works: class F<X> { class G { public X X { get; set; } } } The only logical explanation is that in the second snippet the type parameter X is out of scope, which is not true... Why should a type parameter affect my definitions in a type? IMO, for consistency, either both should work or neither should work. Any other ideas? PS: I call it 'lexical', but it probably is not not the correct term.

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Lexical Analyzer(Scanner) for Language G by using C/C++

- by udsha

int a = 20; int b =30; float c; c = 20 + a; if(c) { a = c*b + a; } else { c = a - b + c; } use C++ / C to Implement a Lexer. 1. Create Unambiguous grammer for language G. 2. Create Lexical Analyzer for Language G. 3. It should identified tokens and lexemes for that language. 4. create a parse tree. 5. to use attribute grammer on a parse tree the values of the intrinsic attributes should be available on the symbol table.

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Whats the scope of c code within objective-c classes?

- by roja

I was reading up about bypassing objective-c's messaging to gain performance (irrelevant to this specific question) when i found an interesting bit of code: #import <Cocoa/Cocoa.h> @interface Fib : NSObject { } - (long long) cFib: (NSUInteger) number; @end @implementation Fib // c implementation of fib long long cFibIMP(NSUInteger number) { return (number < 3) ? 1 : cFib(number - 1) + cFib(number - 2); } // method wrapper for c implementation of fib - (long long) cFib: (NSUInteger) number { return cFibIMP(number); } @end My question is; when using c function, within an objective-c object, what scope is the c function (cFibIMP in this particular case) placed in? Does the objective-c class encapsulate the c function removing change of name-clash or is the c function simply dumped into the global scope of the whole objective-c program?

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Whats the scope of a c function defined within objective-c class?

- by roja

I was reading up about bypassing objective-c's messaging to gain performance (irrelevant to this specific question) when i found an interesting bit of code: #import <Cocoa/Cocoa.h> @interface Fib : NSObject { } - (long long) cFib: (NSUInteger) number; @end @implementation Fib // c implementation of fib long long cFibIMP(NSUInteger number) { return (number < 3) ? 1 : cFib(number - 1) + cFib(number - 2); } // method wrapper for c implementation of fib - (long long) cFib: (NSUInteger) number { return cFibIMP(number); } @end My question is; when using c function, within an objective-c object, what scope is the c function (cFibIMP in this particular case) placed in? Does the objective-c class encapsulate the c function removing change of name-clash or is the c function simply dumped into the global scope of the whole objective-c program?

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Validate HAML from ActiveRecord: scope/controller/helpers for link_to etc?

- by Chris Boyle

I like HAML. So much, in fact, that in my first Rails app, which is the usual blog/CMS thing, I want to render the body of my Page model using HAML. So here is app/views/pages/_body.html.haml: .entry-content= Haml::Engine.new(body, :format => :html5).render ...and it works (yay, recursion). What I'd like to do is validate the HAML in the body when creating or updating a Page. I can almost do that, but I'm stuck on the scope argument to render. I have this in app/models/page.rb: validates_each :body do |record, attr, value| begin Haml::Engine.new(value, :format => :html5).render(record) rescue Exception => e record.errors.add attr, "line #{(e.respond_to? :line) && e.line || 'unknown'}: #{e.message}" end end You can see I'm passing record, which is a Page, but even that doesn't have a controller, and in particular doesn't have any helpers like link_to, so as soon as a Page uses any of that it's going to fail to validate even when it would actually render just fine. So I guess I need a controller as scope for this, but accessing that from here in the model (where the validator is) is a big MVC no-no, and as such I don't think Rails gives me a way to do it. (I mean, I suppose I could stash a controller in some singleton somewhere or something, but... excuse me while I throw up.) What's the least ugly way to properly validate HAML in an ActiveRecord validator?

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Is it possible to run an ng-switch directly on a select > option

- by Asok

Has anyone been able to run an ng-switch on a <select> -> <option> tag, like so?: <select ng-model="form.permitLocality" ng-switch on="localityTypeRadio"> <option ng-switch-when="County" ng-repeat="county in countyList"> {{ county.name }} </option> <option ng-switch-when="City" ng-repeat="city in cityList"> {{ city.name }} </option> <option ng-switch-when="Town" ng-repeat="town in townList"> {{ town.name }} </option> </select> I am not getting any errors or any options (all values verified), I just thought it would save me a couple lines and thought I'd try it. Here is my selector, in case you're curious (value verified): <label class="radio inline"> <input type="radio" name="localityTypeRadio" ng-model="localityTypeRadio" value="County"> County </label> <label class="radio inline"> <input type="radio" name="localityTypeRadio" ng-model="localityTypeRadio" value="City"> City </label> <label class="radio inline"> <input type="radio" name="localityTypeRadio" ng-model="localityTypeRadio" value="Town"> Town </label> This is not a big deal, just didn't know if this was a limitation / not recommended with an ng-switch EDIT I was mistaken when I initially said that nothing was happening (browser caching), there appears to be the correct number of options but the source code shows nothing but white space: <select ng-model="form.permitLocality" class="input-block-level ng-pristine ng-valid" ng-switch="" on="localityTypeRadio" ng-hide="form.permitLocality.length"><option value="? string: ?"></option>  <option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option><option ng-switch-when="City" ng-repeat="city in cityList" class="ng-scope ng-binding" value=" "> </option>  </select>

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angularjs model view update through angular directive

- by Relicset

I am trying to update my view using model in angular directive here is the directive I have created app.directive('aboutOptions', [function() { return { restrict: 'C', scope: { testing: '=' }, transclude: true, link: function(scope, elem, attr) { scope.$watch(attr.ngModel, function() { console.log(scope.$eval(attr.ngModel)); scope.testing = scope.$eval(attr.ngModel); }); } } }]); here is html model and file name is ab.html <input type="text" class="about-options" ng-model="testing" /> Here is the view to be updated and file name is show.html <h2 class="about-options">{{testing}}</h2> ab.html file will be loaded as a template inside jquery ui dialog and my show.html file is in main page If I remove scope: { testing: '=' }, Console is showing what I am typing Update - 1 Tried with the following changes testing: '=test' And in html <input type="text" class="about-options" ng-model="testing" /> <h2 class="about-options">{{test}}</h2>

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Can I create an alias in C# or VB.NET within method scope?

- by Dan Tao

Is there any equivalent to an aliasing statement such as: // C#: using C = System.Console; or: ' VB.NET ' Imports C = System.Console ...but within method scope -- rather than applying to an entire file?

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Why does it matter that in Javascript, scope is function-level, not block-level?

- by Jian Lin

In the question http://stackoverflow.com/questions/1451009/javascript-infamous-loop-problem the accepted answer from Christoph's says that JavaScript's scopes are function-level, not block-level What if Javascript's scopes are block-level, then would the Infamous Loop problem still occur? But will there be a different (or easier way) to fix it? Is it as opposed to other languages, where using a { would start a new scope?

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Can .NET Task instances go out of scope during run?

- by Henry Jackson

If I have the following block of code in a method (using .NET 4 and the Task Parallel Library): var task = new Task(() => DoSomethingLongRunning()); task.Start(); and the method returns, will that task go out of scope and be garbage collected, or will it run to completion? I haven't noticed any issues with GCing, but want to make sure I'm not setting myself up for a race condition with the GC.

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BizTalk 2009 - The Scope of the Table Looping Functoid

- by StuartBrierley

When mapping in BizTalk you will find there are times when you need to map from flat and dispersed elemements in your source schema to a repeated record with child elements in your destination schema. Below is an example of how you can make use of the Table Looping Functoid to bring together these flat elements and create your repeated group. Although this example is purposely simple, I have previsouly encounted this issue on a much more complex scale when mapping the response from a credit scoring agency where all the applicant details were supplied in separate parts of a very flat schema. Consider the source and destination schemas as follows: Although the Table Looping Functoid states that the first input must be a scoping element linked from a repeating group, you can actually also make use of a constant value. In this case I know that the source schema always contains two people, so I set this to two. Then you need to set the number of columns in your table, in this case 2 (name and sex) and link all the required fields from the source schema. Following this you can configure the table. You can then add the Table Extractor functoids and complete the map. If you now validate this map you will see that BizTalk will warn you about the scoping link for the Table Looping Functoid, but this can be safely ignored. C:\Code\Developer Folders\Stuart Brierley\Test Mapping\TableLooping.btm: warning btm1071: A first input of the Table-Looping functoid must be a link from a Source Tree Node which acts as the scoping parameter. Testing the map will produce the following output:

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How should modules access data outside their scope?

- by Joe

I run into this same problem quite often. First, I create a namespace and then add modules to this namespace. Then issue I always run into is how best to initialize the application? Naturally, each module has its own startup procedure so should this data(not code in some cases, just a list of items to run) stay with the module? Or should there be a startup procedure in the global namespace which has the startup data for ALL the modules. Which is the more robust way of organizing this situation? Should some things be made centralized or should there be strict adherence to modules encapsulating everything about themselves? Though this is a general architecture questions, Javascript centric answers would be really appreciated!

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Drupal to Wordpress migration scope for SEO

- by Shane

I'm not sure if this is the appropriate forum, please let me know if it's not (or if there is a better one) and I'll withdraw the question. I'm migrating a drupal site to wordpress and I was wondering what the concerns are with respect to preserving google rank, etc. while assuming the page content is somewhat similar. I've set up 301 redirects, and created a new site map, but the surrounding html / menus, etc are different. Is this considered a concern and are there a best practice for this kind of migration?

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Undeclared Scope in Rock Paper Scissors Simple Game

- by Rianelle

#include <iostream> #include <string> #include <cstdlib> #include <ctime> using namespace std; bool win; int winnings; int draws; int loses; string comChoice; string playerChoice; void winGame () { cout << "You won! Play again?" <<endl; cout << "Type y/n" <<endl; char x; cin >> x; if (x == 'y') { beginGame(); } else if ('n'){ cout << "Game Stopped." <<endl; cout << "Number of Draws: " <<draws << endl; cout << "Number of Loses: " <<loses << endl; cout << "Number of Wins: " << winnings << endl; win = true; } } void drawGame (){ ++draws; cout << "Draw! Try again" << endl; return; } void lose () { cout << "You lose! Try again?" <<endl; cout << "Type y/n" <<endl; char feedback; cin >> feedback; if (feedback == 'y') { beginGame(); } else if ('n'){ cout << "Game Stopped." <<endl; cout << "Number of Draws: " <<draws << endl; cout << "Number of Loses: " <<loses << endl; cout << "Number of Wins: " << winnings << endl; } } void beginGame() { cout << "Welcome to the Rock, Paper and Scissors Game!" <<endl; cout << "Let's begin. Type <rock, paper, scissors> for your choice!" <<endl; cin >> playerChoice; srand(time(0)); int randomizer = 1+(rand()%3); if (randomizer == 1) comChoice = "rock"; if (randomizer == 2) comChoice = "paper"; if (randomizer == 3) comChoice = "scissors"; do { if (playerChoice == comChoice) { drawGame(); } if (playerChoice == "rock" && comChoice == "paper") ++loses; lose(); if (playerChoice == "rock" && comChoice == "scissors") ++winnings; winGame(); if (playerChoice == "paper" && comChoice == "rock") ++winnings; winGame(); if (playerChoice == "paper" && comChoice == "scissors") ++loses; lose(); if (playerChoice == "scissors" && comChoice == "rock") ++loses; lose(); if (playerChoice == "scissors" && comChoice == "paper") ++winnings; winGame(); }while (win != true); } int main () { beginGame(); return 0; }

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Search Engine Optimization Provides the Best Scope to Be Visible in Search Results

You will surely get latest techniques employed to boost up the ranking in search results when you select Toledo search engine optimization services. Highly skilled professionals will take up your website to put it on the front-page of search result by application of natural process which is completely transparent yet most powerful.

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Expanding The Scope of Bridge Tables

Timothy Claason continues talking about database design in a new article. This one talks about expanding the functionality that Bridge Tables provide in your schema.

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Developing a Log Scope – Part I: Developing the concept

Introducing the concept

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