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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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  • JDOM 1.1: hyphen is not a valid comment character

    - by Stefan Kendall
    I'm using tagsoup to clean some HTML I'm scraping from the internet, and I'm getting the following error when parsing through pages with comments: The data "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - " is not legal for a JDOM comment: Comment data cannot start with a hyphen. I'm using JDOM 1.1, and here's the code that does the actual cleaning: SAXBuilder builder = new org.jdom.input.SAXBuilder("org.ccil.cowan.tagsoup.Parser"); // build // Don't check the doctype! At our usage rate, we'll get 503 responses // from the w3. builder.setEntityResolver(dummyEntityResolver); Reader in = new StringReader(str); org.jdom.Document doc = builder.build(in); String cleanXmlDoc = new org.jdom.output.XMLOutputter().outputString(doc); Any idea what's going wrong, or how to fix this? I need to be able to parse pages with long comment strings of <!--------- data ------------>

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  • mysql, sqlite database source code

    - by Yang
    hi guys, i know implementing database is a huge topic, but i want to have a basic understanding of how database systems works (e.g. memory management, binary tree, transaction, sql parsing, multi-threading, partitions, etc) by investigating the source code of the database, since there are a few already proven very robust open source databases like mysql, sqlite and so on. however, the code are very complicated and i have no clue where to start. also i find that the old school database textbooks are only explaining the theory, not the implementation details. Can anyone suggest how should i get started and is there any books that emphasis on the technology and techniques of building dbms used in modern database industry? Thank in advance!

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  • Google Bot information?

    - by Bub Bradlee
    Does anyone know any more details about google's web-crawler (aka GoogleBot)? I was curious about what it was written in (I've made a few crawlers myself and am about to make another) and if it parses images and such. I'm assuming it does somewhere along the line, b/c the images in images.google.com are all resized. It also wouldn't surprise me if it was all written in Python and if they used all their own libraries for most everything, including html/image/pdf parsing. Maybe they don't though. Maybe it's all written in C/C++. Thanks in advance-

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  • Doctrine lazy loading classes takes 100 ms?!

    - by ropstah
    I'm lazy loading my Doctrine classes in my website. Benchmarking has showed that Doctrine::loadModels('models') takes over 100 ms to complete! I have 118 tables in total, but still... setting attribute to conservative loading: Doctrine_Manager::getInstance()->setAttribute(Doctrine::ATTR_MODEL_LOADING, Doctrine::MODEL_LOADING_CONSERVATIVE); running the benchmark part: $CI->benchmark->mark('Doctrineload_start'); Doctrine::loadModels(APPPATH.'models'); $CI->benchmark->mark('Doctrineload_end'); And the result: Doctrineload 0.1085 (seconds) Is this 'normal'? 'context': Loading Time Base Classes 0.0233 Doctrineinit 0.0435 //doctrine_pi.php file, doctrine configuration + db account Doctrineload 0.1085 Masterpageset 0.0001 Userload 0.1208 //1 db query Masterpageaddcontent 0.1565 //1 db query, loading view with some <?=?> php parsing Masterpageshow 0.0203 //loading view Controller Execution Time ( Home / Index ) 0.3591 Total Execution Time 0.3826

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  • *** glibc detected *** perl: munmap_chunk(): invalid pointer

    - by sid_com
    At the and of a script-output (parsing a xhtml-site with XML::LibXML::Reader) I get this: * glibc detected * perl: munmap_chunk(): invalid pointer: 0x0000000000b362e0 * ======= Backtrace: ========= /lib64/libc.so.6[0x7fb84952fc76] /usr/lib64/libxml2.so.2[0x7fb848b75e17] /usr/lib64/libxml2.so.2(xmlHashFree+0xa6)[0x7fb848b691b6] ... ... ======= Memory map: ======== 00400000-0053d000 r-xp 00000000 08:01 182002 /usr/local/bin/perl 0073c000-0073d000 r--p 0013c000 08:01 182002 /usr/local/bin/perl 0073d000-00741000 rw-p 0013d000 08:01 182002 /usr/local/bin/perl 00741000-00c60000 rw-p 00000000 00:00 0 [heap] 7fb8482cd000-7fb8482e3000 r-xp 00000000 08:01 2404 /lib64/libgcc_s.so.1 ... ... Is this due a bug?

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  • NSString to NSData Failing in Encoding

    - by Travis
    I'm trying to use NSXmlParser to parse ISO-8859-1 data. Using Apple's own example for parsing ISO-8859-1, I have the following. NSString *xmlFilePath = [[NSBundle mainBundle] pathForResource:sampleFileName ofType:@"xml"]; NSString *xmlFileContents = [NSString stringWithContentsOfFile:xmlFilePath encoding:NSISOLatin1StringEncoding error:nil]; NSLog(@"contents: %@", xmlFileContents); I see that in the console, the contents of the string is accurate. However when I try to convert it to an NSData object (for use with the parser), I do the following. NSData *xmlData = [xmlFileContents dataUsingEncoding:NSISOLatin1StringEncoding]; But then when my didStartElement delegate gets called, I see  showing up which I think is from an encoding discrepancy. Can NSXmlParser handle ISO-8859-1 and if so, what am I doing wrong?

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  • How To: Eclipse compile error with Android ADT

    - by Sahat
    This error happens when you try to build & run .xml files (i.e. main.xml or strings.xml) files instead of .java Problem: [2010-05-28 06:42:42] Error in an XML file: aborting build. [2010-05-28 06:42:42] res/layout/main.xml:0: error: Resource entry main is already defined. [2010-05-28 06:42:42] res/layout/main.out.xml:0: Originally defined here. [2010-05-28 06:42:42] /Users/sakhat/Code/Sudoku/res/layout/main.out.xml:1: error: Error parsing XML: no element found Solution: Delete the main.out.xml, if you still can't run, then follow this: Eclipse - Project - Clean... - Choose your project - OK

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  • XML::LibXML Line Ending (whitespace) Problem.

    - by Gilbeg
    HI, I am parsing an XML file using LibXML in Perl. The problem that I have is the ending characters (whitespace) is treated as a text node. For instance, given an input like the following abc 123 The parser thinks that the number of child of node "books" is 3, they are: - text node (containing the char between and - element node of "book" - text node (containing the char between and Question is how do I tell LibXML to ignore whitespaces? I tried with no_blanks (that is $parser = XML::LibXML-new(no_blanks = 1) when construction the parser) but it seems that it has no effect. Thanks in advance

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  • Retrieve input and output parameters for SQL stored procs and functions?

    - by Darth Continent
    For a given SQL stored proc or function, I'm trying to obtain its input and output parameters, where applicable, in a Winforms app I'm creating to browse objects and display their parameters and other attributes. So far I've discovered the SQL system function object_definition, which takes a given sysobjects.id and returns the text of that object; also discovered via search this post which describes extracting the parameters in the context of a app using the ADO.NET method DeriveParameters in conjunction with some caching for better performance; and for good measure found some helpful system stored procs from this earlier post on Hidden Features of SQL Server. I'm leaning towards implementing the DeriveParameters method in my C# app, since parsing the output of object_definition seems messy, and I haven't found a hidden feature in that post so far that would do the trick. Is DeriveParameters applicable to both functions and stored procs for purposes of retreiving their parameters, and if so, could someone please provide an example?

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  • Iterate over enum?

    - by Rosarch
    I'm trying to iterate over an enum, and call a method using each of its values as a parameter. There has to be a better way to do it than what I have now: foreach (string gameObjectType in Enum.GetNames(typeof(GameObjectType))) { GameObjectType kind = (GameObjectType) Enum.Parse(typeof (GameObjectType), gameObjectType); IDictionary<string, string> gameObjectData = PersistentUtils.LoadGameObject(kind, persistentState); } //... public static IDictionary<string, string> LoadGameObject(GameObjectType gameObjectType, IPersistentState persistentState) { /* ... */ } Getting the enum names as strings, then parsing them back to enums, feels hideous.

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  • jQuery won't parse my JSON from AJAX query

    - by littlecharva
    Hi, I'm having difficulty parsing some JSON data returned from my server using jQuery.ajax() To perform the AJAX I'm using: $.ajax({ url: myUrl, cache: false, dataType: "json", success: function(data){ ... }, error: function(e, xhr){ ... } }); And if I return an array of items then it works fine: [ { title: "One", key: "1" }, { title: "Two", key: "2" } ] The success function is called and receives the correct object. However, when I'm trying to return a single object: { title: "One", key: "1" } The error function is called and xhr contains 'parsererror'. I've tried wrapping the JSON in parenthesis on the server before sending it down the wire, but it makes no difference. Yet if I paste the content into a string in Javascript and then use the eval() function, it evaluates it perfectly. Any ideas what I'm doing wrong? Anthony

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  • unable to open SSRS reports from domain IP

    - by Lalit
    Hi, I have developed the SSRS reports. It is running fine locally. but after deployed on the domain server it showing exception XML Parsing Error: no element found Location: http://{MyDomainIP}:{port}/Reports/Pages/Folder.aspx Line Number 1, Column 1: I have deployed these reports under the windows authentication . since I tried to give anonymous access so that I can access it, But in IIS I could not found the virtual directory regarding these reports. so where are they deployed ? I could not understand how it is not permitting to the Admin account to show the reports. Please guide me I am using IIS 6.0 , SQL server2008 R2. I am totally new for the this kind of stuff. Edited: how can we give the anonymous access to the SSRS reports? It should not ask for username and password.I know we can do this by IIS , but some how I can not found my SSRS virtual directory. how can i do that ?

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  • how to read a User uploaded file, without saving it to the database

    - by GoodGets
    I'd like to be able to read an XML file uploaded by the user (less than 100kb), but not have to first save that file to the database. I don't need that file past the current action (its contents get parsed and added to the database; however, parsing the file is not the problem). Since local files can be read with: File.read("export.opml") I thought about just creating a file_field for :uploaded_file, then trying to read it with File.read(params[:uploaded_file]) but all that does is throw a TypeError (can't convert HashWithIndifferentAccess into String). I really have tried a lot of various things (including reading from the /tmp directory as well), but could get none of them to work. I hope the brevity of my question doesn't mask the effort I've given to try to solve this on my own, but I didn't want to pollute this question with a hundred ways of how NOT to get it done. Big thanks to anyone who chimes in.

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  • HttpWebRequest Cookie weirdness

    - by Lachman
    I'm sure I must be doing something wrong. But can't for the life of me figure out what is going on. I have a problem where it seems that the HttpWebRequest class in the framework is not correctly parsing the cookies from a web response. I'm using Fiddler to see what is going on and after making a request, the headers of the response look as such: HTTP/1.1 200 Ok Connection: close Date: Wed, 14 Jan 2009 18:20:31 GMT Server: Microsoft-IIS/6.0 P3P: policyref="/w3c/p3p.xml", CP="CAO DSP IND COR ADM CONo CUR CUSi DEV PSA PSD DELi OUR COM NAV PHY ONL PUR UNI" Set-Cookie: user=v.5,0,EX01E508801E$97$2E401000t$1BV6$A1$EC$104$A1$EC$104$A1$EC$104$21O001000$1E31!90$7CP$AE$3F$F3$D8$19o$BC$1Cd$23; Domain=.thedomain.com; path=/ Set-Cookie: minfo=v.4,EX019ECD28D6k$A3$CA$0C$CE$A2$D6$AD$D4!2$8A$EF$E8n$91$96$E1$D7$C8$0F$98$AA$ED$DC$40V$AB$9C$C1$9CF$C9$C1zIF$3A$93$C6$A7$DF$A1$7E$A7$A1$A8$BD$A6$94c$D5$E8$2F$F4$AF$A2$DF$80$89$BA$BBd$F6$2C$B6$A8; expires=Sunday, 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ Set-Cookie: accttype=v.2,3,1,EX017E651B09k$A3$CA$0C$DB$A2$CB$AD$D9$8A$8C$EF$E8t$91$90$E1$DC$C89$98$AA$E0$DC$40O$A8$A4$C1$9C; expires=Sunday, 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ Set-Cookie: tpid=v.1,20001; expires=Sunday, 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ Set-Cookie: MC1=GUID=541977e04a341a2a4f4cdaaf49615487; expires=Sunday, 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ Set-Cookie: linfo=v.4,EQC|0|0|255|1|0||||||||0|0|0||0|0|0|-1|-1; expires=Sunday, 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ Set-Cookie: group=v.1,0; expires=Sunday, 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ Content-Type: text/html But when I look at the response.Cookies, I see far more cookies that I am expecting, with values of different cookies being split up into different cookies. Manually getting the headers seems to result in more wierdness eg: the code foreach(string cookie in response.Headers.GetValues("Set-Cookie")) { Console.WriteLine("Cookie found: " + cookie); } produces the output: Cookie found: user=v.5 Cookie found: 0 Cookie found: EX01E508801E$97$2E401000t$1BV6$A1$EC$104$A1$EC$104$A1$EC$104$21O00 1000$1E31!90$7CP$AE$3F$F3$D8$19o$BC$1Cd$23; Domain=.thedomain.com; path=/ Cookie found: minfo=v.4 Cookie found: EX019ECD28D6k$A3$CA$0C$CE$A2$D6$AD$D4!2$8A$EF$E8n$91$96$E1$D7$C8$0 F$98$AA$ED$DC$40V$AB$9C$C1$9CF$C9$C1zIF$3A$93$C6$A7$DF$A1$7E$A7$A1$A8$BD$A6$94c$ D5$E8$2F$F4$AF$A2$DF$80$89$BA$BBd$F6$2C$B6$A8; expires=Sunday Cookie found: 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ Cookie found: accttype=v.2 Cookie found: 3 Cookie found: 1 Cookie found: EX017E651B09k$A3$CA$0C$DB$A2$CB$AD$D9$8A$8C$EF$E8t$91$90$E1$DC$C89 $98$AA$E0$DC$40O$A8$A4$C1$9C; expires=Sunday Cookie found: 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ Cookie found: tpid=v.1 Cookie found: 20001; expires=Sunday Cookie found: 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ Cookie found: MC1=GUID=541977e04a341a2a4f4cdaaf49615487; expires=Sunday Cookie found: 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ Cookie found: linfo=v.4 Cookie found: EQC|0|0|255|1|0||||||||0|0|0||0|0|0|-1|-1; expires=Sunday Cookie found: 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ Cookie found: group=v.1 Cookie found: 0; expires=Sunday Cookie found: 31-Dec-2014 23:59:59 GMT; Domain=.thedomain.com; path=/ as you can see - the first cookie in the list raw response: Set-Cookie: user=v.5,0,EX01E508801 is getting split into: Cookie found: user=v.5 Cookie found: 0 Cookie found: EX01E508801E$.......... So - what's going on here? Am I wrong? Is the HttpWebRequest class incorrectly parsing the http headers? Is the webserver that it spitting out the requests producing invalid http headers?

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  • Getting a RichTextCtrl's default font size in wxPython

    - by Sam
    I have a RichTextCtrl, which I've modified to accept HTML input. The HTML parsing code needs to be able to increase and decrease the font size as it gets tags like <font size="-1">, but I can't work out how to get the control's default font size to adjust. I tried the following (where self is my RichTextCtrl): fred = wx.richtext.RichTextAttr() self.GetStyle(0,fred) print fred.GetFontSize() However, the final instruction fails, because GetStyle turns fred into a TextAttrEx and so I get AttributeError: 'TextAttrEx' object has no attribute 'GetFontSize'. Am I missing a vastly easier way of getting the default font size?

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  • Scala type conversion error, need help!

    - by Mansoor Ashraf
    Hello I am getting a weird error when trying to use a Java map in Scala. This is the snippet of code val value:Double = map.get(name) if (value eq null) map.put(name, time) else map.put(name, value + time) the map is defined as val map=new ConcurrentHashMap[String,Double] and this is the error I am getting error: type mismatch; found : Double required: ?{val eq: ?} Note that implicit conversions are not applicable because they are ambiguous: both method double2Double in object Predef of type (Double)java.lang.Double and method doubleWrapper in object Predef of type (Double)scala.runtime.RichDouble are possible conversion functions from Double to ?{val eq: ?} if (value eq null) map.put(name, time) I am new to Scala so I am having a hard time parsing the stacktrace. Any help would be appreciated

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  • Can somebody explain this Objective C method declaration syntax

    - by Doug R
    I'm working through an iPhone development book* without really knowing Objective C. For the most part I'm able to follow what's going on, but there are a few method declarations like the one below that I'm having a bit of trouble parsing. For example: - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger) section { return [self.controllers count]; //controllers is an instance variable of type NSArray in this class } It looks this is a method called numberOfRowsInSection, and it returns an NSInteger, and takes an NSInteger as a parameter which is locally called 'section'. But I don't understand all the references to tableView, or why this takes a parameter when it is not used within the method. Can somebody clarify this? Thanks. *p. 258, Beginning iPhone 3 Development, by Mark and LaMarche, published by Apress

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  • How to detect if a page is an RSS or ATOM feed

    - by Pepper
    Hello, I'm currently building a new online Feed Reader in PHP. One of the features i'm working on is feed auto-discovery. If a user enters a website URL, the script will detect that its not a feed and look for the real feed URL by parsing the HTML for the proper tag. The problem is, the way im currently detecting if the URL is a feed or a website only works part of the time, and I know it can't be the best solution. Right now im taking the CURL response and running it through simplexml_load_string, if it can't parse it I treat it as a website. Here is the code. $xml = @simplexml_load_string( $site_found['content'] ); if( !$xml ) // this is a website, not a feed { // handle website } else { // parse feed } Obviously, this isn't ideal. Also, when it runs into an HTML website that it can parse, it thinks its a feed. Any suggestions on a good way of detecting the difference between a feed or non-feed in PHP? Thanks, Pepper http://feedingo.com

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  • Is google gson running on android?

    - by Janusz
    I'm playing arround with google gson for communication with my web back end at the moment. This and this older posts indicate that there are some problems with gson on android. I did some easy tests on the device already but maybe I just missed the bug. Edit I'm now parsing a lot more data. Generic lists etc. still not encountered the bug. Has anybody used gson on Android already? How does it work? Has somebody encountered bugs or something that will stop me from using it once it gets more complicated?

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  • Explanation of JAXB error: Invalid byte 1 of 1-byte UTF-8 sequence

    - by Marcus
    We're parsing an XML document using JAXB and get this error: [org.xml.sax.SAXParseException: Invalid byte 1 of 1-byte UTF-8 sequence.] at javax.xml.bind.helpers.AbstractUnmarshallerImpl.createUnmarshalException(AbstractUnmarshallerImpl.java:315) What exactly does this mean and how can we resolve this?? We are executing the code as: jaxbContext = JAXBContext.newInstance(Results.class); Unmarshaller unmarshaller = jaxbContext.createUnmarshaller(); unmarshaller.setSchema(getSchema()); results = (Results) unmarshaller.unmarshal(new FileInputStream(inputFile)); Update Issue appears to be due to this "funny" character in the XML file: ¿ Why would this cause such a problem??

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  • asn.1 parser in C/Python

    - by elventear
    I am looking for a solution to parse asn.1 spec files and generate a decoder from those. Ideally I would like to work with Python modules, but if nothing is available I would use C/C++ libraries and interface them with Python with the plethora of solutions out there. In the past I have been using pyasn1 and building everything by hand but that has become too unwieldly. I have also looked superficially to libtasn1 and asn1c. The first one had problems parsing even the simplest of files. The second has a good parser but generating C code for decoding seems too complex; the solution worked well with straightforward specs but choked on complex ones. Any other good alternatives I may have overlooked?

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  • Convert scientific notation to decimal notation

    - by Ankur
    There is a similar question on SO which suggests using NumberFormat which is what I have done. I am using the parse() method of NumberFormat. public static void main(String[] args) throws ParseException{ DecToTime dtt = new DecToTime(); dtt.decToTime("1.930000000000E+02"); } public void decToTime(String angle) throws ParseException{ DecimalFormat dform = new DecimalFormat(); //ParsePosition pp = new ParsePosition(13); Number angleAsNumber = dform.parse(angle); System.out.println(angleAsNumber); } The result I get is 1.93 I didn't really expect this to work because 1.930000000000E+02 is a pretty unusual looking number, do I have to do some string parsing first to remove the zeros? Or is there a quick and elegant way?

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  • Why is there no code-folding in emacs ?

    - by Pierre
    There are several questions on SO about how to get code folding in emacs, without having to add any special characters like "markers" in the comments for example. Someone said that there was "no perfect solution." It seems that it could be done by parsing the source of the program being written and look for matching parenthesis or bracket, or to do it based on indentation. You could also use a combination of scripts that use different methods. So why is it commonly accepted that there is no "perfect" and straightforward way to get code-folding in emac? Is there something in emacs or its architecture that makes it hard to program? If it were easy, after so many years of smart people using emacs you would think that someone would have wrote it.

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  • Attempt to set foreign key to nonexistent table, sf_guard_user!

    - by Stick it to THE MAN
    I am using SF 1.3.2 with Propel ORM on Ubuntu 9.10. I created a new SF project and simply copied the sfGuard plugin folder from a pre-existing SF 1.32 project. I manually edited the schema.yml in the new project, adding a user table that reference the the sfGuard table. When I run propel:build-sql, I got the task failed, with the error message: Attempt to set foreign key to nonexistent table, sf_guard_user! I'm not sure why this error is occurring, (the error dosent make sense to me, since the sfGuard plugin works fine with the previous project, with no changes made. what am I missing?? BTW, I have not created any apps in the project yet. I am just running the build-sql task first, to make sure that Propel has no problems with parsing my yml files etc.

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