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• Best design for generating code from an AST?

  - by Sam Washburn

  I'm working on a pretty complex DSL that I want to compile down into a few high level languages. The whole process has been a learning experience. The compiler is written in java. I was wondering if anyone knew a best practice for the design of the code generator portion. I currently have everything parsed into an abstract syntax tree. I was thinking of using a template system, but I haven't researched that direction too far yet as I would like to hear some wisdom first from stack overflow. Thanks!

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• language to create flowcharts

  - by robintw

  Hi, This seems like something which must have been answered before, but I can't find anything appropriate in the question archives. Basically, I'm looking for a little Domain Specific Language to create flowcharts. I'm terrible at graphic design and making things look nice, and I'd really like a langauge where I could write something in code and it would produce a pretty flowchart. I've come across GraphViz, but it seems more suited to creating things like Finite State Machine diagrams, rather than process flowcharts. It also doesn't have the simple DSL-style front-end that would allow me to easily work it. Any ideas? I'm sure this must have been done before... Robin

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• Ruby Metaprogramming

  - by VP

  I'm trying to write a DSL that allows me to do Policy.name do author "Foo" reviewed_by "Bar" end The following code can almost process it: class Policy include Singleton def self.method_missing(name,&block) puts name puts "#{yield}" end def self.author(name) puts name end def self.reviewed_by(name) puts name end end Defining my method as class methods (self.method_name) i can access it using the following syntax: Policy.name do Policy.author "Foo" Policy.reviewed_by "Bar" end If i remove the "self" from the method names, and try to use my desired syntax, then i receive an error "Method not Found" in the Main so it could not find my function until the module Kernel. Its ok, i understand the error. But how can i fix it? How can i fix my class to make it work with my desired syntax that?

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• Persisting hashlib state

  - by anthony

  I'd like to create a hashlib instance, update() it, then persist its state in some way. Later, I'd like to recreate the object using this state data, and continue to update() it. Finally, I'd like to get the hexdigest() o the total cumulative run of data. State persistence has to survive across multiple runs. Example: import hashlib m = hashlib.sha1() m.update('one') m.update('two') # somehow, persist the state of m here #later, possibly in another process # recreate m from the persisted state m.update('three') m.update('four') print m.hexdigest() # at this point, m.hexdigest() should be equal to hashlib.sha1().update('onetwothreefour').hextdigets()

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• Pipeline For Downloading and Processing Files In Unix/Linux Environment With Perl

  - by neversaint

  I have a list of files URLS where I want to download them: http://somedomain.com/foo1.gz http://somedomain.com/foo2.gz http://somedomain.com/foo3.gz What I want to do is the following for each file: Download foo1,2.. in parallel with wget and nohup. Every time it complete download process them with myscript.sh What I have is this: #! /usr/bin/perl @files = glob("foo*.gz"); foreach $file (@files) { my $downurls = "http://somedomain.com/".$file; system("nohup wget $file &"); system("./myscript.sh $file >> output.txt"); } The problem is that I can't tell the above pipeline when does the file finish downloading. So now it myscript.sh doesn't get executed properly. What's the right way to achieve this?

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• Implicit casting Integer calculation to float in C++

  - by Ziddiri

  Is there any compiler that has a directive or a parameter to cast integer calculation to float implicitly. For example: float f = (1/3)*5; cout << f; the "f" is "0", because calculation's constants(1, 3, 10) are integer. I want to convert integer calculation with a compiler directive or parameter. I mean, I won't use explicit casting or ".f" prefix like that: float f = ((float)1/3)*5; or float f = (1.0f/3.0f)*5.0f; Do you know any c/c++ compiler which has any parameter to do this process without explicit casting or ".f" thing?

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• Operation is not valid due to the current state of the object

  - by DBa

  Sometimes, when running a Mono .NET application (it seems to not depend on the input data, as it does not change), I run into following situation: when trying to Dequeue an element from a (non-empty, I check its Count beforehand) Queue, an exception is thrown: Unhandled Exception: System.InvalidOperationException: Operation is not valid due to the current state of the object at System.Collections.Generic.Queue1[DBWorkItem].Peek ()[0x00000] at System.Collections.Generic.Queue1[DBWorkItem].Dequeue () [0x00000] at DBProcessor.process (System.Object q) [0x0006b] in <... Though I can certainly catch this exception, the element is dequeued and lost. Has anyone else encountered this behavior, too?

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• ajax response redirect problem

  - by zurna

  When my member registration form correctly filled in and submitted, server responds with redirect link. But my ajax does not redirect the website. I do not receive any errors, where is my mistake? <script type="text/javascript"> $(document).ready(function() { $("[name='submit']").click(function() { $.ajax({ type: "POST", data: $(".form-signup").serialize(), url: "http://www.refinethetaste.com/FLPM/content/myaccount/signup.cs.asp?Process=Add2Member", success: function(output) { if (output.Redirect) { window.location.href = output.Redirect; } else { $('.sysMsg').html(output); } }, error: function(output) { $('.sysMsg').html(output); } }); }); }); </script> asp codes: If Session("LastVisitedURL") <> "" Then Response.Redirect Session("LastVisitedURL") Else Response.Redirect "?Section=myaccount&SubSection=myaccount" End If

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• how to automate / script processes like signups .

  - by silverkid

  which is the best tool for this - Automation of signup process to a website , e.g an email signup The tool should be able to take data from an external data file like an excel of csv file this data file would contain data such as first name , last name , username, password etc. basic data required during an email signup . I am imagining the data file to contain of each field in a seperate column and each row to contain data for different registration / user. At the places where manual intervention is required like image verification etc. the tool should be able to pause the script until manual bit is done then continue with the script. What is the best way to do this - an automation tool , or any scripting language - please suggest .

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• Can Response.Redirect work in a private void MVC 2 Function?

  - by user54197

  I have a private void function set for some validation. Should my validation fail, I would like to redirect to another ActionResult and kill the process for the ActionResult that was being used. Response.Redirect("controllerName") does not help. Any ideas? [Accept(HttpVerbs.Post)] public ActionResult NerdDinner(string Name) { testName(Name); ... Return RedirectToAction("ActionResultAAA"); } private void testName(string name) { if(name == null) { //Response.Redirect("ActionResultBBB"); } }

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• Magento: How do I retrieve values from fields submitted with the payment method?

  - by Joseph

  Ok. This is getting a little frustrating. I am trying to create a custom payment module for Magento. The purpose is to use Authorize.net's CIM so that we don't have to worry so much about PCI compliance. The issue I am having is that the users need to be able to access their previous credit cards and use those for purchasing. I have the previous cards being stored in the database. They are also being displayed in the form in the checkout process. My issue comes when I click continue after selecting the payment method. How do I get the values I submitted in the form? Specifically, the value of the radio button the saved code is attached to? I am not sure what if any code is needed for me to post, so let me know if you need anything in particular. Thanks.

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• Self updating application install with WIX?

  - by Brian ONeil

  I am writing an application that needs to be installed on a large number of desktops and also needs to update itself. We are looking at WIX for creating the installation. I have used ClickOnce and it is not a good solution for this install. WIX seems to fit, but there is no good process for auto update that I have found. I have looked at ClickThrough, but it doesn't seem ready for prime time yet. Does anyone have another good solution to use with WIX (or maybe another install program) to auto update an application install?

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• How to build a distributable jar with Ant for a java project having external jar dependencies

  - by Nikunj Chauhan

  I have a Java project in Eclipse with class MainClass having main method in package : com.nik.mypackage. The project also references two external libraries, which I copied in the lib folder in Eclipse and then added to build path using ADD JAR function. The libraries being one.jar and two.jar This library is in lib folder in eclipse and added to the build path. I want to create a executable JAR of the application using ant script. So that user can access my application using command: c:>java -jar MyProject-20111126.jar I know about the Eclipse plugin which directly exports a java application as runnable JAR. But I want to learn ant and the build process so manually want to create the build.xm.

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• Unregistering a COM wrapped .NET assembly

  - by flopdix

  I created a COM exposed .NET 2.0 dll and registered with my windows operating system using 'regasm' and 'gacutil' (in GAC). Then I tried to call this component from my classic ASP page. It worked fine. But, I need to change the functionality of my assembly. I unregistered it again using 'regasm' and 'gacutil' (from GAC) utilities and copied my new .NET DLL and registered again (This time using a new version of the DLL). For some reason, i still have a pointer to my old assembly and new calls to the DLL from ASP page are not working. Any Ideas on what process i need to follow to ensure that all the references to the old version are completely removed? I appreciate any help.

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• C# Is it possible to interrupt a specific thread inside a ThreadPool?

  - by Lirik

  Suppose that I've queued a work item in a ThreadPool, but the work item blocks if there is no data to process (reading from a BlockingQueue). If the queue is empty and there will be no more work going into the queue, then I must call the Thread.Interrupt method if I want to interrupt the blocking task, but how does one do the same thing with a ThreadPool? The code might look like this: void Run() { try { while(true) { blockingQueue.Dequeue(); doSomething(); } } finally { countDownLatch.Signal(); } } I'm aware that the best thing to do in this situation is use a regular Thread, but I'm wondering if there is a ThreadPool equivalent way to interrupt a work item.

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• Sharepoint 2007: Disabling Edit/Read Only mode?

  - by TheGambler

  If I open a doc in read only mode I'm able to press save and then it opens up a save as box and the default directory is the directory on the sharepoint server and if you press save you save it to the server. This actually makes the whole process not really "read only" mode since I could actually update the document. Is there a way to prevent this from happening so that if someone chooses read only there is no way possible to updload any changes back to the sharepoint site? Also, it has been suggested as a solution to get rid of the edit/read only option so that people have to check out the document. Is there a way to remove the edit/read only option on documents?

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• sqlcipher command line not working

  - by Min Lin

  I have a encrypted sqlite db and its key. (Which is generated by an android program). However, when I open the db in command line I can not read the db. The command line tool is installed by: brew install sqlcipher I open the database by: sqlcipher EnDB.db >pragma key="6b74fcd"; >select * from bizinfo; It keeps telling me "Error: file is encrypted or is not a database" However, if I open the database file with gui app sqlite database browser (which is a windows program and I run it in wine). It pops up a window for me to enter the key, with 6b74fcd as the key it successfully read the database. As I want to automatically process the db in the future, I can not depend on the GUI. Do you know why the command line is not working?

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• Adding file of the same name into the same list and unable to update name of the SPFile

  - by BeraCim

  Hi all: I'm having difficulties adding file of the same name in the same list and subsequently updating/changing/modifying the name of a SPFile. Basically, this is what I'm trying to do: string fileName = "something"; // obtained from a loop -- loop omitted here. SPFile file = folder.Files.Add(fileName, otherFile.OpenBinary()); The Add method will generate a runtime exception when it finds another file of the same name in the same list/folder. So I thought of changing the file name later in the process: string newGuid = Guid.NewGuid().ToString(); SPFile file = folder.Files.Add(newGuid, otherFile.OpenBinary()); // some other processing... afterwards, rename the file file.name = fileName; file.Item.Update(); A few minute of googling indicated I need to either move the file around, or update the name field by using ["Name"] instead. I was wondering are there any other better ways to get around this problem? Thanks.

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• LINQ to SQL repository - caching data

  - by creativeincode

  I have built my first MVC solution and used the repository pattern for retrieving/inserting/updating my database. I am now in the process of refactoring and I've noticed that a lot of (in fact all) the methods within my repository are hitting the database everytime. This seems overkill and what I'd ideally like is to do is 'cache' the main data object e.g. 'GetAllAdverts' from the database and to then query against this cached object for things like 'FindAdvert(id), AddAdvert(), DeleteAdvert() etc..' I'd also need to consider updating/deleting/adding records to this cache object and the database. What is the best apporoach for something like this? My knowledge of this type of things is minimal and really looking for advice/guidance/tutorial to point me in the right direction. Thanks in advance.

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• Is it possible to call a user-space callback function from kernel space in Linux (ioctl)?

  - by Makis

  Is it possible to expand the ioctl interface in Linux so that the user-space application can send a pointer to a function to the kernel space driver? I'm in particular thinking of ways to handle the stream in user-controllable way but doing it in the kernel. Those operations could be attached to the kernel module but this would make development a lot easier as I wouldn't need to mess with the kernel during development. More specifically, this would be the process: Data is read by the driver to a buffer. Data is handled by these user-defined functions in place. Some more handling is done, possibly with some HW blocks. Data is used by a user-space application.

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• c# finalizer throwing exception?

  - by sjhuk

  Quote from MSDN: If Finalize or an override of Finalize throws an exception, the runtime ignores the exception, terminates that Finalize method, and continues the finalization process. Yet if I have: ~Person() { throw new Exception("meh"); } then it results in a runtime exception? p.s. I know that this should never happen, however I'm just curious around this behaviour. One of our clients had an empty try catch around all of their finalizers.. it didn't even log when things went wrong or reserect the object :/

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• Chrome Extension: How to display tab objects?

  - by Jalleluhah

  I am in the process of designing an extension for Google Chrome that helps to organize tabs (I know, there are many that already exist; that doesn't matter). I wish to open a popup window that will display tabs as objects (i.e., in the same way that it is displayed in the tab bar at the top of the browser). One way of doing this would be to pull various details (ID, Title, URL, etc.) from each tab, create a class and make instantiations of it upon the opening of each tab using these data, but this seems rather convoluted considering that what I want is sitting right there in the tab bar. Is there any simpler way to achieve this? In addition, I have seen several apps that utilize page previews. Is there something in the API that allows direct access to these?

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• Many-To-Many dimensional model

  - by Mevdiven

  Folks, I have a dimension table called DIM_FILE which holds information of the files we received from customers. Each file has detail records which constitutes my FACT table, CUST_DETAIL. In the main process, file is gone through several stages and each stage tags a status to it. Long in a short, I have many-to-many relationship. Any ideas around star schema dimensional modeling. A customer record only belong to a single file and a file can have multiple statuses. FACT ---- CustID FileID AmountDue DIM_FILE -------- FileID FileName DateReceived FILE_STATUS ----------- FileID StatusDateTime StatusCode

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• Different Versions of an application in same java application server

  - by Cem

  Hi, We are utilizing citrix netscalar with more than 20 glassfish java application servers. Unfortunately we have to remove previous application before deploying a new version of it since we have same context for these two different application. This error-prone process leads some problems due to lack of attention in builds or other problems. In an urgent case, we simply want to redirect to all traffic to previous application. What is the best practice to run different version of an application in a substantial number of servers in same time? Thanks

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• How do I get the ID or reference of the listview row I am clicking a checkbox in?

  - by danielea

  I have an ASP.NET 2.0 ListView control (aka:parent) and configured inside this ListView I have another ListView (aka:child). For each row the parent has there is potentially a child ListView control which can have 1-3 rows. Each row has two checkboxes (a select checkbox and a deny checkbox). I need to process these checkboxes in JavaScript so that if one select is chosen on any of the rows all other select checkboxes are unchecked AND the deny checkbox for that row only is unchecked. The rows which were NOT selected CAN have the deny checkboxes checked. What is the best approach to this?

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