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  • What grammar based parser-generator tools exist for ruby?

    - by cartoonfox
    What open source (preferably gem-based) parser-generator options do I have in Ruby? I've used (flex&bison)|(lex&yacc) from C in the past, and I'm comfortable with BNF-style specifications. I've heard of treetop, but it looks a bit alien and verbose compared to yacc... Purpose: I want to convert my text markup language to a BNF and generate the parsing code. I think it's a better strategy than my first-order solution: http://github.com/dafydd/semantictext/blob/master/lib/semantictext/rich_text_parser.rb

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  • Creating thumbnails PHP problem

    - by Wayne
    I have this source code where I got it from net tutsplus. I have configured it and made it work in one PHP file. It does work by transferring the original image, but it does not generate to the thumbnails folder. <?php $final_width_of_image = 100; $path_to_image_directory = "../../img/events/" . urldecode($_GET['name']) . "/"; $path_to_thumbs_directory = "../../img/events/" . urldecode($_GET['name']) . "/thumbnails/"; function createThumbnail($filename) { if(preg_match('/[.](jpg)$/', $filename)) { $im = imagecreatefromjpeg($path_to_image_directory . $filename); } elseif(preg_match('/[.](gif)$/', $filename)) { $im = imagecreatefromgif($path_to_image_directory . $filename); } elseif(preg_match('/[.](png)$/', $filename)) { $im = imagecreatefrompng($path_to_image_directory . $filename); } $ox = imagesx($im); $oy = imagesy($im); $nx = $final_width_of_image; $ny = floor($oy * ($final_width_of_image / $ox)); $nm = imagecreatetruecolor($nx, $ny); imagecopyresized($nm, $im, 0,0,0,0,$nx,$ny,$ox,$oy); imagejpeg($nm, $path_to_thumbs_directory . $filename); $tn = '<img src="' . $path_to_thumbs_directory . $filename . '" alt="image" />'; echo $tn; } if(isset($_FILES['fupload'])) { if(preg_match('/[.](jpg)|(gif)|(png)$/', $_FILES['fupload']['name'])) { $filename = $_FILES['fupload']['name']; $source = $_FILES['fupload']['tmp_name']; $target = $path_to_image_directory . $filename; move_uploaded_file($source, $target); createThumbnail($filename); } } ?> Basically it is supposed to generate a thumbnail of the uploaded image and store the original image into a different folder. The paths are correct, it works by getting the folder name in the URL, it does work, but nothing works for the thumbnails folder. BEFORE you ask this related question, yes, thumbnails generation does work on my server by the PHP GD, I have tested it separately. So this is not the problem. :) How do I get this to work? :(

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  • How does the hash part in hash maps work?

    - by sub
    So there is this nice picture in the hash maps article on Wikipedia: Everything clear so far, except for the hash function in the middle. How can a function generate the right index from any string? Are the indexes integers in reality too? If yes, how can the function output 1 for John Smith, 2 for Lisa Smith, etc.?

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  • Information Extraction Toolkits

    - by MathGladiator
    I'm looking for information extraction libraries where I can have semi structured information that may have either hidden or incomplete data. I want to train some classifiers to pull out content based on the structure. I'm working on building a tool where I can select text in the browser, and it will generate (via some web service call) a classifier that can be used on other documents to pull out text. I'm primarily looking at how the structure of the document can be used to indicate what the content is.

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  • What is the average color of a star?

    - by RCIX
    I am trying to procedurally generate point stars to create a starfield background for my game. I want to weight the color production based on an average star's real color. Can anyone point me in the direction of this sort of data?

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  • Triggers in NHibernate

    - by Felipe
    Hi everybody, I'd like to know if is there something like a Trigger (of databases) in NHibernate that I can use per entity ? I'd like to make a history of each record, and with triggers I can compare the old value and new value of each property and generate a register of history. I've heard about Audit in NHibernate, but it's for all entities, if there isn't another way... how Can I separete a block per entity ? Thanks

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  • Parsing external XML file with C#, what's the most aesthetic way?

    - by Itay
    Hi, say there is an xml file, which not created by me, with a known schema (for example, rss). how would you parse it with C#? would you do that manually by XDocument etc, or would you use XMLSerializer and create a correspond class? or would you use Visual Studio tools to generate classes using a dtd file (that you'll write). what do you think the most aesthetic, easy, not error-prone way?

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  • Telerick java script resize problem

    - by Maki
    Hi! I' have an telerick asp.net control that generate an html code that contains 2 div's, I resize this div's using js, after that this page is loading in iframe and my div's resize to defalult values, where is the problem??

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  • View dynamic code in Visual Studio

    - by Robert
    I generate a dynamic assembly with CSharpCodeProvider, from a C# source saved into a string. I can run the synamic code at runtime, but if I pause the execution Visual Studio doesn't show me the dinamic source code in the call stack. It says "External code" and I can't step into that source code. I think VS can't find PDB or other debug info. Can you help me?

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  • Building both devel and normal version of a RPM package

    - by ereOn
    Hi, I have a library from which I'd like to create two RPM packages. While I found several links on how to create a basic RPM package, I can't find how to create a devel package (see this question if you wonder what a devel package is). What do I have to do to generate both devel and non-devel versions of my RPM package ? Thanks.

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  • MovableType: Is it possible to have a rss feed for "todays" entries?

    - by tomwolber
    Background Our email vendor supports rss feeds for dynamic content, which we use successfully for "daily headline" type emails. This is a great help in automating many different emails that we don't have staffing to create daily. One of our staff as requested that his daily email (which has recent headlines from his Movable Type blog) only have headlines from entries posted on that day. My Question Since we use Movable Type for his blog, is there a way to generate a rss feed that only contains items posted on the current day?

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  • How to properly downcast in C# with a SWIG generated interface?

    - by JG
    I've got a very large and mature C++ code base that I'm trying to use SWIG on to generate a C# interface for. I cannot change the actual C++ code itself but we can use whatever SWIG offers in the way of extending/updating it. I'm facing an issue where a function C++ is written as such: A* SomeClass::next(A*) The caller might do something like: A* acurr = 0; while( (acurr = sc->next(acurr)) != 0 ){ if( acurr isoftype B ){ B* b = (B*)a; ...do some stuff with b.. } elseif( acurr isoftype C ) ... } Essentially, iterating through a container elements that depending on their true type, do something different. The SWIG generated C# layer for the "next" function unfortunately does the following: return new A(); So the calling code in C# land cannot determine if the returned object is actually a derived class or not, it actually appears to always be the base class (which does make sense). I've come across several solutions: Use the %extend SWIG keyword to add a method on an object and ultimately call dynamic_cast. The downside to this approach, as I see it, is that this requires you to know the inheritance hierarchy. In my case it is rather huge and I see this is as a maintenance issue. Use the %factory keyword to supply the method and the derived types and have SWIG automatically generate the dynamic_cast code. This appears to be a better solution that the first, however upon a deeper look it still requires you to hunt down all the methods and all the possible derived types it could return. Again, a huge maintenance issue. I wish I had a doc link for this but I can't find one. I found out about this functionality by looking through the example code that comes with SWIG. Create a C# method to create an instance of the derived object and transfer the cPtr to the new instance. While I consider this clumsy, it does work. See an example below. public static object castTo(object fromObj, Type toType) { object retval = null; BaseClass fromObj2 = fromObj as BaseClass; HandleRef hr = BaseClass.getCPtr(fromObj2); IntPtr cPtr = hr.Handle; object toObj = Activator.CreateInstance(toType, cPtr, false); // make sure it actually is what we think it is if (fromObj.GetType().IsInstanceOfType(toObj)) { return toObj; } return retval; } Are these really the options? And if I'm not willing to dig through all the existing functions and class derivations, then I'm left with #3? Any help would be appreciated.

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  • compile wxWidget on Snow Leopard

    - by Quincy
    I just downloaded wxWidget source code on my snow leopard machine. The source code is the multiplatform one, so it contains windows and GTK components of wxWidget as well. I'd like to compile the wxWidget source code, but haven't found a good guide yet. This is my first step to create a multiplatform project, hopefully I would be able to use CMake to generate makefile later on. Any help would be appreciated.

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  • Visual studio ORM designer option

    - by stackoverflowuser
    linq to sql visual studio Object-Relational designer generates C# entity class names same as the table names (except pluralizing it). so if the table name is authors it generates entity class with name "author". If the table name is Customers it generates class with name "Customer". Is there any option that can be set to make the designer generate entity class names as pascal cased. I am using VS 2010 if that makes any difference. Thanks.

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  • Getting shortest path between 2 nodes in quickgraph

    - by Xtapodi
    Hello, i want to ask if there is any way to generate the shortest path from node A to node B without generating the shortest paths to all the other nodes (stop when node B is in the examined set) with A-star in QuickGraph. I want to plug QuickGraph into a game and thus generating all the paths is not allowed from the time limitations the environment imposes. Any other suggestions to solve my problem in C# are welcome Thanks in advance, Xtapodi

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  • iPhone Excel generation

    - by satyam
    I'm creating an application that generates purchase order. I'm able to create text file from the details entered by user. I would like to generate an Excel which looks much better than a normal text file. Is there any open source library that I can use in my application?

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  • Python: how to execute generated code ?

    - by Natim
    Hello guys I have this code, and I would like to use the app parameter to generate the code instead of duplicating it. if app == 'map': try: from modulo.map.views import map return map(request, *args, **kwargs) except ImportError: pass elif app == 'schedule': try: from modulo.schedule.views import schedule_day return schedule_day(request, *args, **kwargs) except ImportError: pass elif app == 'sponsors': try: from modulo.sponsors.views import sponsors return sponsors(request, *args, **kwargs) except ImportError: pass elif app == 'streaming': try: from modulo.streaming.views import streaming return streaming(request, *args, **kwargs) except ImportError: pass Do you have any idea ? Thanks

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  • Question about Architecture for Viewing Images in ASP.NET MVC App

    - by Charlie Flowers
    I have an approach in mind for an image viewer in a web app, and want to get a sanity check and any thoughts you stackoverflowers might have. Here's the whirlwind nutshell summary: I'm working on an ASP.NET MVC application that will run in my company's retail stores. Even though it is a web application, we own the store machines and have control over them. We have a "windows agent" running on the store machine which we can talk to from the browser via javascript (it is a WCF service, and our web app has permission to talk to it from the browser). One of the web pages needs to be an "image viewer" page with some common things like Rotate & Zoom. Now, there are some WebForms controls that offer Rotate and Zoom. However, they take up server resources and generate a good bit of traffic between the server and the browser. For example, the Rotate function would cause an ajax call to the server, which would then generate a new image written to a .NET Canvas object, which would then be written to a file on the server, which would then be returned from the ajax call and refreshed inside the browser. Normally, that's a pretty good way of doing things. But in our case, we have code running on the store machine that we can communicate with. This leads me to consider the following approach: When the user asks to view an image, we tell our "windows agent" to download it from our image server to the store machine. We then redirect our browser to our image viewer page, which will pull the image from the local file we just wrote to the store machine. When the user clicks "Rotate", we cause JavaScript code in the browser to call our "windows agent" software, asking it to perform the "Rotate" function. The "windows agent" does the rotation using the same kind of imaging control that would formerly have been used on the server, but it does so now on the store machine. Javascript in the browser then refreshes the image on the page to show the newly rotated image. Zoom and similar features would be implemented the same way. This seems to be much more efficient, scalable, and responsive for the end-users. However, I've never heard of anything like it being done, mostly because it's rare to have this combination of a web app plus a "windows agent" on the client machine. What do you think? Feasible? Reasonable? Any pitfalls I overlooked or improvements / suggestions you can see? Has anyone done anything like this who would like to offer the wisdom of experience? Thanks!

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  • Where to find free-to-use, complex test databases?

    - by Jay
    I need a database for testing a data masking solution. Any database would do (Oracle/MSSQL flavor). I just need the schema / db definition. I have tools to generate data records. The magnitude of database I am looking should have 30 odd tables with 30 odd columns in each table - a HUGE database. Do freely available complex database /schema definitions exist on the internet? If yes, where do I find them?

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  • Which CDN offers rewrite rules for urls

    - by Marc
    I'm looking for a Content Delivery Network which offers the ability to make images available through multiple urls while they exist physically only one time. I want to generate seo friendly image urls with the relevant keywords in different languages. Thanks for your advice!

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