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• Lexing newlines in scala StdLexical?

  - by Nick Fortescue

  I'm trying to lex (then parse) a C like language. In C there are preprocessor directives where line breaks are significant, then the actual code where they are just whitespace. One way of doing this would be do a two pass process like early C compilers - have a separate preprocessor for the # directives, then lex the output of that. However, I wondered if it was possible to do it in a single lexer. I'm pretty happy with writing the scala parser-combinator code, but I'm not so sure of how StdLexical handles whitespace. Could someone write some simple sample code which say could lex a #include line (using the newline) and some trivial code (ignoring the newline)? Or is this not possible, and it is better to go with the 2-pass appproach?

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• Drag and drop + custom drawing in Android

  - by Rich

  I am working on something that needed custom drag-and-drop functionality, so I have been subclassing View, doing a bunch of math in response to touch events, and then rendering everything manually through code on the canvas in onDraw. Now, the more functionality I add, the more the code is growing out of control and I find myself writing a ton more code than I would expect to write in a high level environment like Android. Is this how it's done, or am I missing something? If I'm not doing anything fancy in the UI, the framework handles the majority of my interactions. Built-in controls handle the touches and drags, and my code is pretty much limited to business logic and data. Is there a way to leverage the power of some of the UI controls and things like animations while also doing some of it manually in the onDraw canvas? Is there an accepted standard of when to use one or the other (if indeed the two approaches can be mixed)?

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• Microsoft sublanguage string to locale identifier

  - by Jacob

  I can't seem to find a way to convert, or find, a local identifier from a sublanguage string. This site shows the mappings: http://msdn.microsoft.com/en-us/library/dd318693(v=VS.85).aspx I want the user to enter a sublanguage string, such as "France (FR)" and to get the local identifier from this, which in this case would be 0x0484. Or the other way around, if a user enters 0x0480 then to return French (FR). Has anyone encountered this problem before and can point me in the right direction? Otherwise I'm going to be writing a few mapping statements to hard code it and maintain future releases if anything changes. BTW, I'm coding in C++ for Windows platform. Cheers

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• Error in Decompression?

  - by user595606

  I am writing a crawler for a website. Its response is gzip encoded. I am not able to parse correctly a particular field, though the decompression is successful. I am also using htmlagilitypack to parse it, the parsed value of the field is only a part of the original value as an example : I am getting only /wEWAwKc04vTCQKb86mzBwKln/PuCg== whereas the firebug shows the actual value as much longer: /wEWBgKj7IuJCgKb86mzBwKln/PuCgLT250qAtC0+8cMAvimiNYD what does the '==' at the end means? I am assuming it that its a error on decompressors behalf?

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• Sqlalchemy layout with WSGI application

  - by TheDude

  I'm working on writing a small WSGI application using Bottle and SqlAlchemy and am confused on how the "layout" of my application should be in terms of SqlAlchemy. My confusion is with creating engines and sessions. My understanding is that I should only create one engine with the 'create_engine' method. Should I be creating an engine instance in the global namespace in some sort of singleton pattern and creating sessions based off of it? How have you done this in your projects? Any insight would be appreciated. The examples in the documentation dont seem to make this entirely clear (unless I'm missing something obvious). Any thoughts?

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• How to programaticaly gain root privileges ?

  - by ereOn

  I am writing a software (in C++, for Linux/Mac OSX) which runs as a non-privileged user and but needs root privileges at some point (to create a new virtual device). Running this program as root is not a option (mainly for security issues) and I need to know the identity (uid) of the "real" user. Is there a way to mimic the "sudo" command behavior (ask for user password) to temporarily gain root privileges and perform the particular task ? If so, which functions would I use ? Thank you very much for your help !

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• Java Swing app hangs when run in normal mode but runs fine in debug mode

  - by snocorp

  I am writing a basic Java application with a Swing front-end. Basically it loads some data from a Derby database via Apache Cayenne and then displays it in a JTable. I'm doing my development in Eclipse and I don't think it's important but I'm using Maven for dependencies. Now this works fine when I run using Debug but it seems to hang the display thread when I use the Run button. I've done a thread dump and I'm not 100% certain but everything looks good. I used Java VisualVM and the threads look fine there as well. Strangely it seems to work intermittently. It's pretty consistent though and easy to reproduce. If anyone has any ideas, I'm all out of them.

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• yahoo doesn't accpet emails i send to it

  - by hd

  i am writing a sendmail module to email some things to my site users. for testing it i use my own email at yahoo to receive this email. but some thing woeful happend. about 1200 sent to my email address at yahoo at a moment and yahoo sent all of them to spam box. now i can't send any email to yahoo addresses and my server gives me this message in mailq: "delivery temporarily suspended: host g.mx.mail.yahoo.com[98.137.54.238] refused to talk to me..." how can i solve this problem?? many users of my site have yahoo email address. my server uses postfix. thanks for helping .

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• Yahoo doesn't accept emails i send to it

  - by hd

  i am writing a sendmail module to email some things to my site users. for testing it i use my own email at yahoo to receive this email. but something woeful happened. about 1200 sent to my email address at yahoo at a moment and yahoo sent all of them to spam box. now i can't send any email to yahoo addresses and my server gives me this message in mailq: delivery temporarily suspended: host g.mx.mail.yahoo.com[98.137.54.238] refused to talk to me... how can i solve this problem?? many users of my site have yahoo email address. my server uses postfix. thanks for helping .

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• How do you reach a "flow" state while programming?

  - by acrosman

  I'm not talking about program flow, but as in the state of working called flow, the state where you can get great work done the most effectively. I find that my current work environment while good in many ways does not allow me to get into a good state of mind for writing code most of the time (my job includes many other functions). If it's critical to get something done I'll often put on head-phones with classical music and try to drown out the office noise around me (and discourage co-workings from asking me questions). I am best able to get work done late in the evening when the house is quite and I've been thinking about the project for most of the day. What tricks have you found when working in less then perfect office environments?

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• Interview question: How do I detect a loop in this linked list?

  - by jjujuma

  Say you have a linked list structure in Java. It's made up of Nodes: class Node { Node next; // some user data } and each Node points to the next node, except for the last Node, which has null for next. Say there is a possibility that the list can contain a loop - i.e. the final Node, instead of having a null, has a reference to one of the nodes in the list which came before it. What's the best way of writing boolean hasLoop(Node first) which would return true if the given Node is the first of a list with a loop, and false otherwise? How could you write so that it takes a constant amount of space and a reasonable amount of time? Here's a picture of what a list with a loop looks like: Node->Node->Node->Node->Node->Node--\ \ | ----------------

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• Does Windows 7 have a Kiosk Mode?

  - by Jordan

  I'm writing a Kiosk on a Windows 7 computer. The Kiosk is on a touch screen computer, that will not have a keyboard. The application is a WPF application running the .NET Framework version 3.5. I'm having problems with the progress bar task bar showing up (blinking) at the bottom of the screen. This unfortunately gives the user access to the background operating system. Is there someway to lock a full screen application window into the front of the screen without using it on-top-of-everything mode. Some sort of Kiosk mode, or some tool that was designed for this.

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• changing command line arguments

  - by Shadi

  Hi, I am writing a C program. It takes its arguments from commandLine. I want to change the commandLine arguments in the code. As they are defined as "const char *", I can not change them using "strcpy", "memcpy", ... Also, you know, I can not just change their type from "const char *" to "char *". Is there any way to change them? Thank you so much in advance. Best regards, Shadi.

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• Can't return a String value and append it...why?

  - by squeezemylime

  I am writing an app and am having problems returning a simple string value, and I'm not sure why. The function I am using (within a file called APIManager.m) is: - (NSString*) returnVenueUrl { NSString *venueUrl = [devEnvironment stringByAppendingString:@"venue/id/"]; return venueUrl; } I can return this properly by doing this in another .m file: APIManager *apiManager = [APIManager apiManager]; NSLog(@"view venue URL is here: %@", [apiManager returnVenueUrl]); But when I go to append a variable cast as a String onto it, I get nothing.. venueURL = [apiManager returnVenueUrl]; venueURL = [venueURL stringByAppendingString:venueId]; NSLog(@"the Full Venue URL is: %", venueURL); If anyone has any advice on how to fix this, it would be much appreciated!

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• How do I define an implicit typecast from my class to a scalar?

  - by Delan Azabani

  I have the following code, which uses a Unicode string class from a library that I'm writing: #include <cstdio> #include "ucpp" main() { ustring a = "test"; ustring b = "ing"; ustring c = "- -"; ustring d; d = "cafe\xcc\x81"; printf("%s\n", (a + b + c[1] + d).encode()); } The encode method of the ustring class instances converts the internal Unicode into a UTF-8 char *. However, because I don't have access to the char class definition, I am unsure on how I can define an implicit typecast (so that I don't have to manually call encode when using with printf, etc).

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• How can I access variables outside of current scope in javascript?

  - by sekmet64

  I'm writing some application in javascript and cannot figure it out how to access the variables declared in my function, inside this jquery parse. Inside I can access global variables, but I don't really want to create global vars for these values. Basically I want to extract file names from an xml document in the simulationFiles variable. I check if the node attribute is equal with the simName and extract the two strings inside the xml elements, that part I think it's working. How can I extract those xml elements and append them to local variables? function CsvReader(simName) { this.initFileName = "somepath"; this.eventsFileName = "somepath"; $(simulationFiles).find('simulation').each(function() { if ($(this).attr("name") == simName) { initFileName += $(this).find("init").text(); eventsFileName += $(this).find("events").text(); } }); }

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• Compare output of program to correct program using bash script, without using text files

  - by Doug

  I've been trying to compare the output of a program to known correct output by using a bash script without piping the output of the program to a file and then using diff on the output file and a correct output file. I've tried setting the variables to the output and correct output and I believe it's been successful but I can't get the string comparison to work correctly. I may be wrong about the variable setting so it could be that. What I've been writing: TEST=`./convert testdata.txt < somesampledata.txt` CORRECT="some correct output" if [ "$TEST"!="$CORRECT" ]; then echo "failed" fi

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• Connecting .NET to Common Lisp

  - by JPanest

  I have a fairly involved LispWorks Common Lisp module that sits atop some .NET modules via RDNZL. It has come up that I need to expose some of its functionality to some other .NET applications, and I'm not sure the best (shortest) way to approach this without re-writing the module in C#. I know there are a few CLR Lisp implementations but most seem unmaintained or incomplete and there are many things that cannot be trivially re-written in Scheme. Is there any facility that exposes the opposite of what RDNZL enables (.NET - Common Lisp)? Can I use RDNZL to deliver a DLL that accepts .NET objects?

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• How do I get the security details for a long path?

  - by Biff MaGriff

  Hello, I am doing a file server migration and I'm writing a small C# app to help me map the user permissions so we can put them in user groups. I'm currently using Directory.GetAccessControl(path); However it fails when it get to this 263 char file path. Invalid name. Parameter name: name I get the same error when I use DirectoryInfo.GetAccessControl(); Is there a work around or alternative to this method? Thanks!

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• Problem with array of elements of a structure type

  - by kobac

  I'm writing an app in Visual Studio C++ and I have problem with assigning values to the elements of the array, which is array of elements of structure type. Compiler is reporting syntax error for the assigning part of the code. Is it possible in anyway to assign elements of array which are of structure type? typedef struct { CString x; double y; } Point; Point p[3]; p[0] = {"first", 10.0}; p[1] = {"second", 20.0}; p[2] = {"third", 30.0};

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• Manually logging in a user without password

  - by Agos

  Hi everybody; I hope you can help me figure the best way to implement a manual (server-side initiated) login without using the password. Let me explain the workflow: User registers Thank you! An email with an activation link has been sent blablabla (Account now exists but is marked not enabled) User opens email, clicks link (Account is enabled) Thank you! You can now use the site What I'm trying to do is log in the user after he has clicked the email link so he can start using the website right away. I can't use his password since it's encrypted in the DB, is the only option writing a custom authentication backend?

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• Are there programming languages that rely on non-latin alphabets?

  - by Jaxsun

  Every programming language I have ever seen has been based on the Latin alphabet, this is not surprising considering I live in Canada... But it only really makes sense that there would be programming languages based on other alphabets, or else bright computer scientists across the world would have to learn a new alphabet to go on in the field. I know for a fact that people in countries dominated by other alphabets develop languages based off the Latin alphabet (eg. Ruby from Japan), but just how common is it for programming languages to be based off of other alphabets like Arabic, or Cyrillic, or even writing systems which are not alphabetic but rather logographic in nature such as Japanese Kanji? Also are any of these languages in active widespread use, or are they mainly used as teaching tools? This is something that has bugged me since I started programming, and I have never run across someone who could think of a real answer.

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• Testing a (big) collection retrieved from a db

  - by Bas

  I'm currently doing integration testing on a live database and I have the following sql statement: var date = DateTime.Parse("01-01-2010 20:30:00"); var result = datacontext.Repository<IObject>().Where(r => r.DateTime > date).First(); Assert.IsFalse(result.Finished); I need to test if the results retrieved from the statement, where the given date is less then the date of the object, have Finished set to False. I do not know how many results I get back and currently I'm getting the first object of the list and check if that object has Finished set to false. I know testing only the first item of the list is not valid testing, as a solution for that I could iterate through the list and check all items on Finished, but putting logic in a Test is kinda going against the concept of writing 'good' tests. So my question is: Does anyone have a good solution of how to properly test the results of this list?

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• Switch case in jquery

  - by Jasl

  Am I writing the correct switch case? var cnt = $("#div1 p").length; alert(cnt); switch (cnt) { case (cnt >= 10 && cnt <= 20): alert('10'); break; case (cnt >= 21 && cnt <= 30): alert('21'); break; case (cnt >= 31 && cnt <= 40): alert('31'); break; default: alert('>41'); } For some reason, the alert does not occur when the conditions are matched!

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• XmlTextWriter.WriteFullEndElement tags on the same line

  - by Apeksha

  I am using an XMLTextWriter to create an XML document dynamically (in VB.Net). I want empty tags to appear like this - <Tag></Tag> and not this - <Tag /> So, I am using WriteFullEndElement to end the element tag. But it is writing out the tag as - <Tag> </Tag> i.e. with a newline character between the tags. The web service reading this XML rejects it due to the newline character. How do I avoid the newline, and have both the start and end tags on the same line?

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