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• How to implement a graph-structured stack?

  - by Emil

  Ok, so I would like to make a GLR parser generator. I know there exist such programs better than what I will probably make, but I am doing this for fun/learning so that's not important. I have been reading about GLR parsing and I think I have a decent high level understanding of it now. But now it's time to get down to business. The graph-structured stack (GSS) is the key data structure for use in GLR parsers. Conceptually I know how GSS works, but none of the sources I looked at so far explain how to implement GSS. I don't even have an authoritative list of operations to support. Can someone point me to some good sample code/tutorial for GSS? Google didn't help so far. I hope this question is not too vague.

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• WWSAPI and setting "soapenv:Header" values

  - by Ben Burnett

  I'm trying to connect to a web service from a C++ app using WWS. I got the base connection working just fine. My XML message has two parts though, a header (soapenv:Header) and a body (soapenv:Body). the generated functions only fill in the body. How do I set the Header information? I assumed it has something to do with WsSetHeader() or WsAddCustomHeader() but can't seam to find the right values to use in the parameters. Can someone point me in the right direction here? I've been googling and trying to research this now for several days and am finding many sources for basic help with WWSAPI, but nothing seams to go deeper into how to use it for more advanced applications. any good links or resources to find more advanced help on WWSAPI? Thanks, --Ben Burnett www.burnett.ws

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• Don't understand the typing of Scala's delimited continuations (A @cps[B,C])

  - by jkff

  I'm struggling to understand what precisely does it mean when a value has type A @cps[B,C] and what types of this form should I assign to my values when using the delimited continuations facility. I've looked at some sources: http://lamp.epfl.ch/~rompf/continuations-icfp09.pdf http://www.scala-lang.org/node/2096 http://dcsobral.blogspot.com/2009/07/delimited-continuations-explained-in.html http://blog.richdougherty.com/2009/02/delimited-continuations-in-scala_24.html but they didn't give me much intuition into this. In the last link, the author tries to give an explicit explanation, but it is not clear enough anyway. The A here represents the output of the computation, which is also the input to its continuation. The B represents the return type of that continuation, and the C represents its "final" return type—because shift can do further processing to the returned value and change its type. I don't understand the difference between "output of the computation", "return type of the continuation" and "final return type of the continuation". They sound like synonyms.

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• How does NHibernate handle cascade="all-delete-orphan"?

  - by Johannes Rudolph

  I've been digging around the NHibernate sources a little, trying to understand how NHibernate implements removing child elements from a collection. I think I've already found the answer, but I'd ideally like this to be confirmed by someone familiar with the matter. So far I've found AbstractPersistentCollection (base class for all collection proxies) has a static helper method called GetOrphans to find orphans by comparing the current collection with a snapshot. The existence of this method suggests NHibernate tries to find all oprhaned elements and then deletes them by key. Is this correct, in terms of the generated SQL?

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• Providing dynamic data to webpage

  - by Marius

  Hi, I have a web page that displays dynamic data which changes every 2 seconds. Data is selected from various data sources including Oracle. Currently, the page reloads every 10 seconds and runs a PHP script which retrieves the data and displays the page. I have other pages that gives a different view on the same data. This means the same query is run again for them as well. If I have 4 of these pages with 10 concurrent users each, suddenly the data retrieval happens 40 times every 10 seconds, obviously not ideal. I have some ideas on how to improve this situation, but I thought I would ask from some ideas from other experts that might have come across a similar situation. I'm not bound to PHP, and my server is on a Linux platform. Regards Marius

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• Providing dynamic data to webpage

  - by Marius

  Hi, I have a web page that displays dynamic data which changes every 2 seconds. Data is selected from various data sources including Oracle. Currently, the page reloads every 10 seconds and runs a PHP script which retrieves the data and displays the page. I have other pages that gives a different view on the same data. This means the same query is run again for them as well. If I have 4 of these pages with 10 concurrent users each, suddenly the data retrieval happens 40 times every 10 seconds, obviously not ideal. I have some ideas on how to improve this situation, but I thought I would ask from some ideas from other experts that might have come across a similar situation. I'm not bound to PHP, and my server is on a Linux platform. Regards Marius

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• PHP: Alternative to SESSIONS

  - by iamjonesy

  Hi, I have a PHP application that relies on session variables quite a lot. After login the user get redirected to a page that executes code to set up a load of session variables depending on who the user is. The application is using data from different sources and the sessions are used to store ID numbers to query the databases. So when the user goes to a page that will query their asset management system their ID for that particular database is called via the session. I've had a LOT of problems with session variables recently. Sometimes only one session file is created during the lifetime of the app, and sometimes each session request results in a new session id (still haven't managed to find out why!). My question is this. Is there an alternative to using session variables for this? Like globals or some other way? Any help most appreciated! Regards, Jonesy

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• SLF4J, Common Logging, console output

  - by Mauricio Scheffer

  I have this 3rd party library that has: slf4j-api-1.5.5.jar slf4j-jdk14-1.5.5.jar jcl-over-slf4j-1.5.5.jar I want to write some tests against this library and see its log output, and I don't want to add any more logging libraries (no log4j or anything else). I understand that SLF4J and Common Logging are both logging abstractions so I probably need to write my own simple concrete logger (or maybe not, since jcl-over-slf4j includes org.apache.commons.logging.impl.SimpleLog?). If so, what interfaces should I implement, and more importantly, how do I set up SL4J/Common Logging to use my logger in my test? I read in the SLF4J docs that I have to modify the StaticLoggerBinder class... does that really mean that I actually have to download SLF4J sources, modify the class and recompile it?

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• How do I get source file information with dumpbin /symbols when compiling with VS 2005?

  - by Thomas Dartsch

  I have a tool which uses the output of dumpbin /symbols to do some dependency analysis with our C/C++ libraries. When we compiled the libs with VS 6.0, the dumpbin COFF SYMBOL TABLE contained entries like 000 00000008 DEBUG notype Filename | .file x:\mydir\mysource.c allowing me to get the relationship between sources and defined/used symbols, which is essential for my tool. When we compile with VS 2005, these entries are missing. When I look at the libs with a hex editor, it seems that there is no filename information at all included in the binary files, so it seems not to be a dumbin problem but is compilation related. So I'm looking for a way to get the Filename entries back into my libraries when compiling with VS 2005.

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• Mono Project: How to install Mono framework on Red Hat Linux which is compiled on centOS ?

  - by funwithcoding

  We have Red Hat Enterprise Linux servers at work place. However we dont have Red Hat Linux desktops. So I used CentOS 5.4 to compile the Mono sources and generated the Mono framework for CentOS and tested with some sample codes and I am satisfied. I want to transfer this compiled framework to Red Hat Enterprise Linux 5. How Can I do that? Do I have to compile the Mono framework statically or do I have to copy the linked libraries as well? I am not familiar with linux much. Any help is highly appreciated.

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• Bing search API using Jsonp not working, invalid label

  - by Blankman

  Struggling with Bing's json request (bing search, not map), I am getting an error back that says 'Invalid Label' My query url is: var bingurl="http://api.search.live.net/json.aspx?Appid=##APIKEY##&query=Honda&sources=web"; $.ajax({ type: "GET", url: bingurl, data: "{}", contentType: "application/json; charset=utf-8", dataType: "jsonp", success: function(data) { $callBack(data); }, error: function(msg) { alert("error" + msg); } }); Firebug reports 'invalid label' and then dumps the json response. No idea what is wrong? help appreciated.

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• Creating a web-service client directly from the source

  - by ben

  Hi, I am trying to generate the WS client jar directly from the @Webservice class(es). Let's take this example : package com.example.maven.jaxws.helloservice; import javax.jws.WebService; @WebService public class Hello { public String sayHello(String param) { ; return "Hello " + param; } } I can generate a war file and use glassfish to serve this webservice, and from there I can use the glassfish WSDL URL to generate the client sources. What I am trying to do is to skip the glassfish part. From my maven project defining the webservice, I would like to use the jaxws-maven-plugin to create the client classes but I cannot find any way to specify the actual URL of the webservice. It should be possible right? @see also http://stackoverflow.com/questions/2097789/creating-a-web-service-client-with-a-known-but-inaccessible-wsdl

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• AJAX, PHP, XML, and cascading drop-down lists

  - by Dave Jarvis

  What PHP libraries would you recommend to implement the following: Three dependent drop-down lists Three XML data sources AJAX-based Essentially, I'd like to create an XML database and wire up a form that allows the user to select three different dependent parameters: User clicks Region User clicks District (filtered by Region) User clicks Station (filtered by District) Even though I would like to use PHP and XML, the general problem is: One XHTML form Three dependent, cascading drop-down lists Three flat files (no relational database) for the list data The solution must be efficient, simple, reliable, and cross-browser. What technologies would you recommend to solve the problem? Thank you!

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• Why aren't APT generated classes being compiled by Eclipse?

  - by yamsha

  In my Eclipse project I'm using a third-party annotation processor, Hibernate Metamodel Generator to be exact. The annotation processor works as expected and generates files as specified by the spec. These files are generated inside the directory of the Eclipse project under a "gen" folder. In the project properties this is correctly reflected since two source folders exist - "src" and "gen." However, when the project is built for some reason all the [generated] sources under "gen" are not compiled (checking the "bin" directory I only see .class file from the "src" directory). Does anyone know why this is happening?

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• Convert Double to String without precision loss in javascript

  - by holger

  I would like to convert a floating point variable to a string without losing any precision. I.e. I would like the string to have the same information as my floating point variable contains, since I use the output for further processing (even if it means that the string will be very long and readable). To put this more clearly, I would like to have functions for cyclic conversion var dA = 323423.23423423e4; var sA = toString(dA); var dnA = toDouble(sA); and I would like dnA and dA to be equal Thanks PS: Sources on the internet usually talk about how to round strings but I have not found information on exact representation. Also I am not interested in Arbitrary Precision calculations, I just need double precision floating point arithmetic.

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• setting source classpath in eclipse with stupid project structure

  - by lisak

  What do you guys do, when you have huge project built with ant for instance, where the source folders are right bellow the root project folder, for building classpath from source files ? putting entire project as a source folder is nonsense. Putting separate folders as source folders can't be done if they are part of the package hierarchy and the only thing I could think of, is to copy the source folders into a separate folder and add it then as source folder which is weird but I don't know how else to do it. Having to duplicate sources just because of the eclipse way of making classpath and also because of somebody doing stupid project structure

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• Error building java project

  - by Leandro

  I have tryied to build my project in netbeans 6.8/ windows xp, and I've received this errors: ..\nbproject\build-impl.xml:452: The following error occurred while executing this line: ..\nbproject\build-impl.xml:224: Compile failed; see the compiler error output for details.output for details. The lines are, respectively: 452: `<j2seproject3:javac gensrcdir="${build.generated.sources.dir}"/>` 224: <javac debug="@{debug}" deprecation="${javac.deprecation}" destdir="@{destdir}" encoding="${source.encoding}" excludes="@{excludes}" fork="${javac.fork}" includeantruntime="false" includes="@{includes}" source="${javac.source}" sourcepath="@{sourcepath}" srcdir="@{srcdir}" target="${javac.target}" tempdir="${java.io.tmpdir}"> I have tried to reinstall netbeans, java, and anything more...but I can't resolve this error. Do someone know how can I fix it? All the best! Leandro

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• SyndicationItem.Content is Null

  - by kdmurray

  I'm trying to pull the contents of an RSS feed into an object that can be manipulated in code. It looks like the SyndicationFeed and SyndicationItem classes in .NET 3.5 will do what I need, except for one thing. Every time I've tried to read in the contents of an RSS feed using the SyndicationFeed class, the .Content element for each SyndicationItem is null. I've run my feed through FeedValidator and have tried this with feeds from several other sources, but to no avail. XmlReader xr = XmlReader.Create("http://shortordercode.com/feed/"); SyndicationFeed feed = SyndicationFeed.Load(xr); foreach (SyndicationItem item in feed.Items) { Console.WriteLine(item.Title.Text); Console.WriteLine(item.Content.ToString()); } Console.ReadLine(); I suspect I may just be missing a step somewhere, but I can't seem to find a good tutorial on how to consume RSS feeds using these classes.

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• Emacs, Cedet and semantic

  - by synasius

  Hello everyone, I've configured CEDET for emacs following Alex article (great!!). Now, the questions: 1 - i've generated GTAGS with Gnu Global in my /usr/include, how can i check if semantic is using GTAGS? 2 - can I keep my GTAGS in another directory and instruct semantic to use that dir?? 3 - In c/c++ sources, completion on include statement (from system headers) doesn't list all available headers. Ok, this is a stupid problem.. but makes me think something is not working right Thanks for your help!

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• Cannot connect to *.dbf file through JDBC drivers

  - by leodali

  i'm trying to connect to *.dbf (dBase III) file on my Java application, running on a Windows Server 2003 system. I'm encountering this error and I cannot really understand the meaning (sources for OdbcJdbc.java seems to be unavailable): [Microsoft][ODBC dBase driver] '(unknown)' is not a valid path error Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); String database = "jdbc:odbc:DRIVER={Microsoft dBase Driver(*.dbf)};DBQ=D:\\dbNeri\\CARISTAT;"; Connection conn = DriverManager.getConnection(database); Statement s = conn.createStatement(); String selTable = "SELECT * FROM CARISTAT"; Does it exists a JDBC driver able to connect to dBase files or do I have to import external libraries to do the magic? Thanks in advance for your help!

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• Android NDK Question

  - by Kyle

  The NDK does not contain very many shared libraries for you to access. As a result, I must build many sources myself and link them into my shared library via static/shared libraries. I want to compile libpng as a Static Library. Trouble is, I have absolutely no idea how, nor does google instruct you how to do so in their NDK. I'm no expert on the NDK even after reading everything I can find, so I would really appreciate someone who actually knows how this is done. I do have the Android.mk file for libpng, as google's Android OS source contains it. Infact, I got the entire directory on the android OS source for libpng and it's dependent libraries. It was somewhat of a shortcut instead of making one myself. I don't know how to make a particular directory which contains this file, though. Thanks for reading!

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• List of Selenium RC browser launchers

  - by jacksenechal

  I am trying to find a full list of Selenium RC browser launchers. So far I've not been able to find any documentation that lists them all. I've gathered the following ones from various sources. *iexplore - Launches IE *firefox - Launches Firefox *safari - Launches Safari *opera - Launches Opera *chrome - Launches special Firefox profile with elevated security privileges, to bypass Javascript security errors *iehta - Launches IE with elevated security privileges *piiexplore - Launches IE in proxy injection mode *pifirefox - Launches Firefox in proxy injection mode *custom - Launches your own custom browser executable Are there any others lurking out there? Is there any source of documentation on how each one is used?

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• Fastest way to list all primes below N in python

  - by jbochi

  This is the best algorithm I could come up with after struggling with a couple of Project Euler's questions. def get_primes(n): numbers = set(range(n, 1, -1)) primes = [] while numbers: p = numbers.pop() primes.append(p) numbers.difference_update(set(range(p*2, n+1, p))) return primes >>> timeit.Timer(stmt='get_primes.get_primes(1000000)', setup='import get_primes').timeit(1) 1.1499958793645562 Can it be made even faster? EDIT: This code has a flaw: Since numbers is an unordered set, there is no guarantee that numbers.pop() will remove the lowest number from the set. Nevertheless, it works (at least for me) for some input numbers: >>> sum(get_primes(2000000)) 142913828922L #That's the correct sum of all numbers below 2 million >>> 529 in get_primes(1000) False >>> 529 in get_primes(530) True EDIT: The rank so far (pure python, no external sources, all primes below 1 million): Sundaram's Sieve implementation by myself: 327ms Daniel's Sieve: 435ms Alex's recipe from Cookbok: 710ms EDIT: ~unutbu is leading the race.

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• Attaching a static library to an iphone/ipad application

  - by Jack

  Hello, which is the best approach to include a static library with into an application for iPhone or iPad? I could choose to compile the library supplying right platform and building a library file with the ar utility and then add as a framework to the project including the source of the library .c/.h and compile them together with the application The first approach seems simpler, because I won't care about managing all specific settings of the library I want to include but how can I create the library both for iPhone and iPad and allow xcode to use the right library upon linking? The second approach seems more complex since xcode will take care about compiling my application and the library (with different settings I suppose) then how should I go? I can easily add sources of the lib but I'll have to include the make scripts to allow xcode use them to build in the right way. Any suggestions about how to proceed? The library I'm trying to include is libssh. (I know that this library, of course, has already been compiled and tried succesfully on iPhone) Thanks in advance.

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• How can I use Perl and RRD to plot ping times?

  - by ChrisMuench

  I'm trying to do my first rrd graph through Perl. I have tried RRD::Simple and rrds and just can't get either one to work. Here's what I have so far: use strict; use RRD::Simple (); # Create an interface object my $rrd = RRD::Simple-new( file = "server.rrd" ); # Put some arbitary data values in the RRD file for the same # 3 data sources called bytesIn, bytesOut and faultsPerSec. $rrd-create( EqSearch = "DERIVE", MfSearch = "DERIVE", EQCostBasis = "DERIVE", MFCostBasis = "DERIVE" ); $rrd-update( EqSearch = 2, MfSearch = 3, EQCostBasis = 10, MFCostBasis = 15 ); # Generate graphs: # /var/tmp/myfile-daily.png, /var/tmp/myfile-weekly.png # /var/tmp/myfile-monthly.png, /var/tmp/myfile-annual.png my %rtn = $rrd-graph( destination = "/Users/cmuench/Documents/Code/perl", title = "Server A", vertical_label = "", interlaced = "", periods = [qw(hour)] );

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