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  • Matching math expression with regular expression?

    - by Ethan
    For example, these are valid math expressions: a * b + c -a * (b / 1.50) (apple + (-0.5)) * (boy - 1) And these are invalid math expressions: --a *+ b @ 1.5.0 // two consecutive signs, two consecutive operators, invalid operator, invalid number -a * b + 1) // unmatched parentheses a) * (b + c) / (d // unmatched parentheses I have no problem with matching float numbers, but have difficulty with parentheses matching. Any idea? If there is better solution than regular expression, I'll accept as well. But regex is preferred.

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  • Pass a single boolean from an Android App to a libgdx game

    - by Doug Henning
    I'm writing an Android application that needs to pass a single boolean into an Android game that I am also writing. The idea is that the user does something in the App which will affect how the game operates. This is tricky with LIBGDX since I need to get the bool value into the Java files of the game, but of course, you can't call Android specific things from within LIBGDX's main Java files. I tried using an intent but of course the same problem persists. I can get the boolean into the MainActivity.Java of the android output of the game, but can't pass it along any further since the android output and the main java files don't know about each other. I have seen a few tutorials that explain how to use set up an interface in the LIBGDX java files that can call android things. This seems like wild overkill for what I want to do. I've been trying to use Android's Shared Preferences with LIBGDX's Gdx.app.getPreferences, but I can't make it work. Anyhelp would be MUCH appreciated. I've set up two hello world applications. One is a standard Android app, with a single button that is supposed to write "true" into the shared preferences. The other is a standard LIBGDX hello world that is supposed to do nothing but check that bool when launched and if true display one image to the screen, if false, display a different one. Here's the relevant bit of the Android code: import android.preference.PreferenceManager; public void onClick(View view) { if (view == this.boolButton){ final String PREF_FILE_NAME = "myBool"; SharedPreferences preferences = getSharedPreferences(PREF_FILE_NAME, MODE_WORLD_WRITEABLE); SharedPreferences.Editor editor = preferences.edit(); editor.putBoolean("myBool", true); editor.commit(); } } And here's the relevant bit of the code from the LIBGDX main file: Preferences prefs = Gdx.app.getPreferences("myBool"); boolean switcher = prefs.getBoolean("myBool"); if(switcher == true){ texture = new Texture(Gdx.files.internal("data/worked512.png")); prefs.putBoolean("myBool", false); } else { texture = new Texture(Gdx.files.internal("data/libgdx.png")); } Everything compiles fine, it just doesn't work. I've spent HOURS googling trying to find a way to pass this single boolean from android into a LIBGDX main and I'm totally stumped. Thanks for your help.

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  • Pass a single boolean from an Android App to a LIBGDK game

    - by Doug Henning
    I'm writing an Android application that needs to pass a single boolean into an Android game that I am also writing. The idea is that the user does something in the App which will affect how the game operates. This is tricky with LIBGDX since I need to get the bool value into the Java files of the game, but of course, you can't call Android specific things from within LIBGDX's main Java files. I tried using an intent but of course the same problem persists. I can get the boolean into the MainActivity.Java of the android output of the game, but can't pass it along any further since the android output and the main java files don't know about each other. I have seen a few tutorials that explain how to use set up an interface in the LIBGDX java files that can call android things. This seems like wild overkill for what I want to do. I've been trying to use Android's Shared Preferences with LIBGDX's Gdx.app.getPreferences, but I can't make it work. Anyhelp would be MUCH appreciated. I've set up two hello world applications. One is a standard Android app, with a single button that is supposed to write "true" into the shared preferences. The other is a standard LIBGDX hello world that is supposed to do nothing but check that bool when launched and if true display one image to the screen, if false, display a different one. Here's the relevant bit of the Android code: import android.preference.PreferenceManager; public void onClick(View view) { if (view == this.boolButton){ final String PREF_FILE_NAME = "myBool"; SharedPreferences preferences = getSharedPreferences(PREF_FILE_NAME, MODE_WORLD_WRITEABLE); SharedPreferences.Editor editor = preferences.edit(); editor.putBoolean("myBool", true); editor.commit(); } } And here's the relevant bit of the code from the LIBGDX main file: Preferences prefs = Gdx.app.getPreferences("myBool"); boolean switcher = prefs.getBoolean("myBool"); if(switcher == true){ texture = new Texture(Gdx.files.internal("data/worked512.png")); prefs.putBoolean("myBool", false); } else { texture = new Texture(Gdx.files.internal("data/libgdx.png")); } Everything compiles fine, it just doesn't work. I've spent HOURS googling trying to find a way to pass this single boolean from android into a LIBGDX main and I'm totally stumped. Thanks for your help.

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  • SQL Server Boolean (bit datatype)

    - by Derek D.
    In SQL Server, boolean values can be represented using the bit datatype. Bit values differ from boolean values in that a bit can actually be one of three values 1, 0, or NULL; while booleans can only either be true or false. When assigning bits, it is best to use 1 or zero [...]

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  • A Generic Boolean Value Converter

    - by codingbloke
    On fairly regular intervals a question on Stackoverflow like this one:  Silverlight Bind to inverse of boolean property value appears.  The same answers also regularly appear.  They all involve an implementation of IValueConverter and basically include the same boilerplate code. The required output type sometimes varies, other examples that have passed by are Boolean to Brush and Boolean to String conversions.  Yet the code remains pretty much the same.  There is therefore a good case to create a generic Boolean to value converter to contain this common code and then just specialise it for use in Xaml. Here is the basic converter:- BoolToValueConverter using System; using System.Windows.Data; namespace SilverlightApplication1 {     public class BoolToValueConverter<T> : IValueConverter     {         public T FalseValue { get; set; }         public T TrueValue { get; set; }         public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)         {             if (value == null)                 return FalseValue;             else                 return (bool)value ? TrueValue : FalseValue;         }         public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)         {             return value.Equals(TrueValue);         }     } } With this generic converter in place it easy to create a set of converters for various types.  For example here are all the converters mentioned so far:- Value Converters using System; using System.Windows; using System.Windows.Media; namespace SilverlightApplication1 {     public class BoolToStringConverter : BoolToValueConverter<String> { }     public class BoolToBrushConverter : BoolToValueConverter<Brush> { }     public class BoolToVisibilityConverter : BoolToValueConverter<Visibility> { }     public class BoolToObjectConverter : BoolToValueConverter<Object> { } } With the specialised converters created they can be specified in a Resources property on a user control like this:- <local:BoolToBrushConverter x:Key="Highlighter" FalseValue="Transparent" TrueValue="Yellow" /> <local:BoolToStringConverter x:Key="CYesNo" FalseValue="No" TrueValue="Yes" /> <local:BoolToVisibilityConverter x:Key="InverseVisibility" TrueValue="Collapsed" FalseValue="Visible" />

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  • When are ASP.NET Expression Builders most useful?

    - by SkippyFire
    I saw an example of using Expression Builders, and creating your own Custom Expression Builder Classes here: http://aspnet.4guysfromrolla.com/articles/022509-1.aspx However, I fail to see the value in using this approach. It doesn't seem much easier than programmatically setting values in your code behind. As far as I can tell, the only thing you can do with them is set properties. Maybe they would be useful for setting defaults on certain controls? Can anyone shed light on where this ASP.NET feature becomes powerful?

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  • Expression Encoder SDK - WMA Pro Codec Issues with Windows Server 2003

    - by PortageMonkey
    I am using the Expression Encoder SDK to encode .avi and Flash files to a .wmv format suitable for Silverlight. By default, EE encodes files with audio using the the WMA PRO codec. If you are running Windows Server 2003, this is a problem as it doesn't support the WMA PRO codec and produces and error message similar to the following. Error Message: The Audio Profile settings do not match a valid system profile. Error Source: Microsoft.Expression.Encoder Error Target Site: System.String GetProfileString() I am looking for a way to change the default audio codec to something suitable for WS 2003. I am aware that although not supported natively, there is a highly invasive way to install Windows Media Player 11 and it's codecs on WS 2003 but this involves registry tinkering and other hacks not suitable for our production environments so that solution is out.

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  • Storing expression references to data base

    - by Marcus
    I have standard arithmetic expressions sotred as strings eg. "WIDTH * 2 + HEIGHT * 2" In this example WIDTH and HEIGHT references other objects in my system and the literals WIDTH and HEIGHT refers to a property (Name) on those objects. The problem I'm having is when the Name property on an expression object changes the expression won't match anymore. One solution I came up with is to instead of storing "WIDTH * 2 + HEIGHT * 2" i store "{ID_OF_WIDTH} * 2 + {ID_OF_HEIGHT} * 2" And let my parser be able to parse this new syntax and implement an interface or such on referenced objects IExpressionReference { string IdentifierName { get; } } Anyone have a better/alternative solution to my problem?

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  • Storing expression template functors

    - by UncaughtException
    Hello guys, at the moment I'm really interested in expression templates and want to code a library for writing and differentiating mathematical functions with a lambda-style syntax. At the moment, I'm able to write (_x * _x)(2); and get the correct result 4. But I would really like to do something like MathFunction f = _x * _x; f(2);, but I don't have any ideas on how to cope with the recursive expression templates on the right side. Is it possible to achieve this without using the 'auto'-Keyword instead of MathFunction or having to make the operator() virtual? Thanks for your help!

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  • Express XPath as an expression tree

    - by 47d_
    If I have an XPath query like NodeA/NodeB[@WIDTH and not(@WIDTH="20")] | NodeC[@WIDTH and not(@WIDTH="20")]/NodeD Is there any API available to visualize this XPath query as a stack of atomic expressions, something like (following is generic) Get results of NodeA, call it "first set" Get results of NodeB from "first set" Filter where [@WIDTH and not(@WIDTH="20")] Filter NodeD, call this "node d for B" Get results of NodeC from "first set" Filter where [@WIDTH and not(@WIDTH="20")] Filter NodeD, call this "node d for C" Combine "node d for B" and "node d for C" I am trying to see if we can convert the XPath expression into custom expression which is close to english and vice versa. If no API is available, what would be the best approach? Thanks in advance.

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  • Enumerable.Range in and Expression and Entity Framework

    - by eka808
    I'm currently developping an expression method (used in linq to entity queries) who has to give me a daycount for a given period (start date and end date) decrementing this daycount if specials days are in the period. My idea was the following : Generate an enumerable with all the dates (and with Enumerable.Range) Make a .Where on this enumerable to remove the specials dates Like a MyEnumerable.Where(a = a != "20120101") After that, return a MyEnumerable.Count() I come with this code : return (p) => Enumerable .Range(1, 4) .Where(a => a != 20120101) .AsQueryable() .Count() I tried to cast as a list, as a queryable, both (like the example) and no way ! it doesn't work ! I always get this error : LINQ to Entities does not recognize the method 'System.Collections.Generic.IEnumerable`1[System.Int32] Range(Int32, Int32)' method, and this method cannot be translated into a store expression. Have you got an idea about that ? Using an enumerable is of course not mandatory, any working solutions is good ^^ Thank's by advance !

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  • C# Regular Expression for Regular Expression Parsing

    - by Chris
    I want to returns matches from a regular expression string. The regex string is: (?<TICKER>[A-Z]+)(?<SPACE>\\s)(?<MONTH_ALPHA_ABBREV>Jan|Feb|Mar|Apr|May|Jun|Jul|Sep|Oct|Nov|Dec)(?<SPACE>\\s)(?<DAY>\\d+)(?<SPACE>\\s)(?<YEAR_LONG>[2][0][0-9][0-9])(?<SPACE>\\s)(?<STRIKE_DOLLAR>\\d+(?=[.]))[.](?<STRIKE_DECIMAL>(?<=[.])\\d+)(?<SPACE>\\s)(?<PUTCALL_LONG>Call|Put) And I want to get matches for all of the group names and all of the items within square brackets (including the square brackets) outside of open and closed parenthesis. I have this regex: ((?<=[<])([A-Z]|[_])+(?=[>]))|(\\[.\\]) But this returns square bracket items within the parenthesis. To be more specific these are the matches I want from the regex at the top (keep in mind this needs to be flexible for any regex): TICKER SPACE MONTH_ALPHA_ABBREV SPACE DAY SPACE YEAR_LONG SPACE STRIKE_DOLLAR [.] STRIKE_DECIMAL SPACE PUTCALL_LONG

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  • Mixing regular expression and other conditional expression in a bash if statement

    - by Tassos
    I can't get around this for quite sometime now. As I read along manuals and tutorials I'm getting more confused. I want an if statement with the following logic: if [ -n $drupal_version ] && [[ "$drupal_version" =~ DRUPAL-[6-9]-[1-9][1-9] ]]; then but I can't get it to work properly. When the script is evaluated using the "bash -x ... " script construct, works ok but when is run as a regular script my expression is not evaluated (eventhough the above condition should be met the else part is run). Could you provide any help?

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  • Expression Studio 4 Community Launch Event

    - by Timmy Kokke
    Event On June 7th Expression Studio 4 will be launched at the Internet Week in New York. One day later, on June 8th, the Dutch Silverlight and Expression User Group SIXIN organizes the Dutch Community Launch in collaboration with Microsoft and Centric at Centric's office in IJsselstein. To celebrate the 4 Expression release we have two interesting speakers. In addition, we give three packages Expression Studio and more great gifts away.   Program The preliminary program for the evening is as follows: 5:45 p.m. - Food, drinks and networking 6:45 p.m. - Reception and Introduction by Koen Zwikstra, co-founder of SIXIN and Silverlight MVP 7:00 p.m. - Phone 7 Building a Windows application using the new features of Expression Blend by Loek van den Ouweland, founder and web designer for Magic Studio 8:00 p.m. - Break 8:30 p.m. - Tour Encoder and Expression Web by Antoni Dol, senior designer at Macaw 9:30 p.m. - Networking while enjoying a drink   Ask your question to one of the speakers If you have a question to one of the speakers, then you can by email ([email protected]) or thru Twitter. Send an email with subject # expression4 or send a tweet @ sixinUG and use it to hashtag # expression4.   Register To register for this event or to get more information you can go to the SIXIN meetings page here.   Special thanks to our sponsors:

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  • How to use Common Table Expression and check no duplication in SQL Server

    - by vodkhang
    I have a table references to itself. User table: id, username, managerid and managerid links back to id Now, I want to get all the managers including direct manager, manager of direct manager, so on and so forth... The problem is that I do not want to have a unstop recursive sql. So, I want to check if an id alreay in a list, I will not include it anymore. Here is my sql for that: with all_managers (id, username, managerid, idlist) as ( select u1.id, u1.username, u1.managerid, ' ' from users u1, users u2 where u1.id = u2.managerid and u2.id = 6 UNION ALL select u.id, u.username, u.managerid, idlist + ' ' + u.id from all_managers a, users u where a.managerid = u.id and charindex(cast(u.id as nvarchar(5)), idlist) != 0 ) select id, username from all_managers; The problem is that in this line: select u1.id, u1.username, u1.managerid, ' ' The SQL Server complains with me that I can not put ' ' as the initialized for idlist. nvarchar(40) does not work as well. I do not know how to declare it inside a common table expression like this one. Usually, in db2, I can just put varchar(40) My sample data: ID UserName ManagerID 1 admin 1 2 a 1 3 b 1 4 c 2 What I want to do is that I want to find all managers of c guy. The result should be: admin, a, b. Some of the user can be his manager (like admin) because the ManagerID does not allow NULL and some does not have direct manager. With common table expression, it can lead to an infinite recursive. So, I am also trying to avoid that situation by trying to not include the id twice. For example, in the 1st iteration, we already have id : 1, so, in the 2nd iteration and later on, 1 should never be allowed. I also want to ask if my current approach is good or not and any other solutions? Because if I have a big database with a deep hierarchy, I will have to initialize a big varchar to keep it and it consumes memory, right?

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  • Which MySQL Datatype to use for storing boolean values from/to PHP?

    - by Beat
    Since MySQL doesn't seem to have any 'boolean' datatype, which datatype do you 'abuse' for storing true/false information in MySQL? Especially in the context of writing and reading from/to a PHP-Script. Over time I have used and seen several approaches: tinyint, varchar fields containing the values 0/1, varchar fields containing the strings '0'/'1' or 'true'/'false' and finally enum Fields containing the two options 'true'/'false'. None of the above seems optimal, I tend to prefer the tinyint 0/1 variant, since automatic type conversion in PHP gives me boolean values rather simply. So which datatype do you use, is there a type designed for boolean values which I have overlooked? Do you see any advantages/disadvantages by using one type or another?

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  • .NET Expression Trees Tutorial

    - by zoman
    I've been looking for a good tutorial on Expression trees (C#) for a while, but no luck so far. Most of the stuff I've found on the Web was too high level and very basic. Does anyone know some decent tutorial that goes beyond the fundamentals?

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  • Expression blend for WPF 4 release date

    - by OffApps Cory
    I understand that Visual Studio 2010 is being released 12 April, but does anyone know when Expression Blend for .NET and WPF 4 is being released? I have the beta, but it is pretty buggy and it crashes a lot. I have not had much luck searching for the release date, so any help would put my mind at ease. Cory

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  • Users need Silverlight 4.0 for Expression Blend?

    - by Mohit Deshpande
    I have Visual Studio 2010 beta 2 installed and Expression Blend Preview for .NET 4. When I began to debug it, it asked me to install Silverlight 4.0 beta. So now I am wondering if people who are going to view my application need to install Silverlight 4.0 instead of Silverlight 3.5. If so, how can I downgrade from 4.0 to 3.5?

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  • Built-in precedence in Expression Trees for math?

    - by jdk
    I'm unable to find the .NET FCL built-in concept of precedence to leverage while constructing Expression Trees. Ref System.Linq.Expressions Namespace. Is this something that must be handled manually in code, or is it somehow implicit and I'm not recognizing it (e.g. maybe through helper methods or classes)? I want to apply it to math operations to ensure 3 + 5 * 10 results in 53 instead of 80.

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  • regular expression

    - by Jeeenda
    Hi I need a regular expression that'll give me something like this part ./something\", [something.sh from something like this string ("./something\", [something.sh", ["./something\", [something.sh"], [/* 37 vars */]) is that possible? I'm having real trouble making this since there's that \" escape sequence and also that ',' character, so I cannot simply use match everything instead of these characters. I'm working on unix so it's also possible to use pipeline of few greps or something like that. Thanks for advice.

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  • C# .NET Email Regular Expression Validation

    - by Pino
    Can anyone correct the expression below to also not allow blank field? <asp:RegularExpressionValidator ID="expEmail" runat="server" ControlToValidate="txtEmail" ErrorMessage="valid email address required" ValidationExpression="^([a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]){1,70}$"></asp:RegularExpressionValidator>

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  • java regular expression

    - by changed
    Hi I have to create a regular expression for some path conversion. Example for path are //name:value /name:value // name:value /name:value /name:value /name:value//name:value thing is how to check for // or / at the start or middle of the string and how can i specify that name can contain any of this a-zA-Z and _ Path also contains white spaces. thanks-

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