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• Code hot swapping in Erlang

  - by Roger Alsing

  I recently saw a video about Erlang on InfoQ, In that video one of the creators presented how to replace the behavior of a message loop. He was simply sending a message containing a lambda of the new version of the message loop code, which then was invoked instead of calling the old loop again. Is that code hot swapping in Erlang reffers to? Or is that some other more native feature?

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• C# Math calculator

  - by user329814

  Is there a way to calculate math expressions like (2-3/4*12) in a different way than presented here? http://www.c-sharpcorner.com/uploadfile/mgold/codedomcalculator08082005003253am/codedomcalculator.aspx

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• Parse HTML with CSS or XPath selectors?

  - by ovolko

  My goal is to parse HTML with lxml, which supports both XPath and CSS selectors. I can tie my model properties either to CSS or XPath, but I'm not sure which one would be the best, e.g. less fuss when HTML layout is changed, simpler expressions, greater extraction speed. What would you choose in such a situation?

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• Rails: three most recent comments for unique users

  - by Dennis Collective

  class User has_many :comments end class Comment belongs_to :user named_scope :recent, :order => 'comments.created_at DESC' named_scope :limit, lambda { |limit| {:limit => limit}} named_scope :by_unique_users end what would I put in the :by_unique_users so that I can do Comment.recent.by_unique_users.limit(3), and only get one comment per user

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• Browser version detect using GWT?

  - by Stevko

  Is there GWT api that will tell me which browser version it detected? I've found a flaw with IE7's regex handling and need to code around some tricky String.matches() expressions.

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• Plugins for firefox, which help to write HTML parsers

  - by Neir0

  Hi, Anybody know plugins for firefox, which help to write HTML parsers? it will be nice if plugin allow to test XPath and regular expressions(highlight matched text, cut some parts etc).

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• Create and populate two-dimensional array in Scala

  - by ~asteinlein

  What's the recommended way of creating a pre-populated two-dimensional array in Scala? I've got the following code: val map = for { x <- (1 to size).toList } yield for { y <- (1 to size).toList } yield (x, y) How do I make an array instead of list? Replacing .toList with .toArray doesn't compile. And is there a more concise or readable way of doing this than the nested for expressions?

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• C array assignment and indexing with similar variable.

  - by Todd R.

  Hello! I apologize if this has been posted before. Compiling under two separate compilers, BCC 5.5 and LCC, yields 0 and 1. #include <stdio.h> int main(void) { int i = 0, array[2] = {0, 0}; array[i] = ++i; printf("%d\n", array[1]); } Am I to assume not all compilers evaluate expressions within an array from right to left?

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• Is it worth using Python's re.compile?

  - by Mat

  Is there any benefit in using compile for regular expressions in Python? h = re.compile('hello') h.match('hello world') vs re.match('hello', 'hello world')

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• Choosing the MVC view engine

  - by leonard

  I want to allow the end-users of my web application to modify views (via web based back office), stored in the database. The desired view engine is expected to be code-injection safe, meaning that the end-user will be limited to the absolute minimum number of expressions available, no server code inserts are allowed. Is any suitable view engine available to download?

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• Built-in precedence for Expression Trees?

  - 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, 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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• Private IP Address Identifier in Regular Expression

  - by caseyamcl

  Hey I'm a total n00b at Regular Expressions. I'm wondering if this is the best way to match a string that starts with a private IP address (Perl-style Regex): (^127\.0\.0\.1)|(^192\.168)|(^10\.)|(^172\.1[6-9])|(^172\.2[0-9])|(^172\.3[0-1]) Thanks much!

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• Am I right in thinking there is no way to put an if statement and an else statement on line in Python?

  - by Louise

  Am I right in thinking I can't put an if-statement and the corresponding else-statement on one line in Python? NB: variable = value1 if condition else value2 is NOT two statements. It's one statement which can take the value of one of two expressions. I want to do something like if condition a=value else b=value Am I right in thinking this requires a full if-else in Python? Like if condition: a=value else: b=value Thanks, Louise

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• Stored Functions with Linq to Entities

  - by Lawnmower

  Hi, How can I make a MS-SQL stored function availabe in LINQ expressions if using the Entity framework? The SQL function was created with CREATE FUNCTION MyFunction(@name) ...). I was hoping to access it similarly to this: var data = from c in entities.Users where MyFunction(c.name) = 3; Unfortunately I have only .NET 3.5 available.

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• How do you solve this Haskell problem using higher order functions?

  - by Linda Cohen

  Using higher order functions (map, fold or filter) and if necessary lambda expressions. Write a definition for f1 and f2 so the following evaluation is valid: f1 (f2 (*) [1,2,3,4]) 5 output: [5,10,15,20] Any help would be appreciated, thanks.

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• twisted reactor stops too early

  - by pygabriel

  I'm doing a batch script to connect to a tcp server and then exiting. My problem is that I can't stop the reactor, for example: cmd = raw_input("Command: ") # custom factory, the protocol just send a line reactor.connectTCP(HOST,PORT, CommandClientFactory(cmd) d = defer.Deferred() d.addCallback(lambda x: reactor.stop()) reactor.callWhenRunning(d.callback,None) reactor.run() In this code the reactor stops before that the tcp connection is done and the cmd is passed. How can I stop the reactor after that all the operation are finished?

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• Translate C# code into AST?

  - by Erik Forbes

  Is it currently possible to translate C# code into an Abstract Syntax Tree? Edit: some clarification; I don't necessarily expect the compiler to generate the AST for me - a parser would be fine, although I'd like to use something "official." Lambda expressions are unfortunately not going to be sufficient given they don't allow me to use statement bodies, which is what I'm looking for.

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• Massage with BeatifulSoup or clean with Regex

  - by Mridang Agarwalla

  Could someone tell me whats a better way to clean up bad HTML so BeautifulSoup can handle it - should one use the massage methods of BeautifulSoup or clean it up using regular expressions? Thanks.

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• Load Pymacs & Ropemacs only when opening a Python file ?

  - by Mtgred

  I use Pymacs to load Ropemacs and Rope with the following lines in my .emacs as described here. (autoload 'pymacs-load "pymacs" nil t) (pymacs-load "ropemacs" "rope-") It however slowdown the startup of Emacs significantly as it takes a while to load Ropemacs. I tried the following line instead but that loads Ropemacs everytime a Python file opened... (add-hook 'python-mode-hook (lambda () (pymacs-load "ropemacs" "rope-"))) Is there a way to perform the pymacs-load when opening a Python file but only if ropemacs and rope aren't loaded yet?

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• UNIX find for finding file names NOT ending in specific extensions?

  - by Cristi Diaconescu

  Is there a simple way to recursively find all files in a directory hierarchy, that do not end in a list of extensions? E.g. all files that are not *.dll or *.exe UNIX/GNU find, powerful as it is, doesn't seem to have an exclude mode (or I'm missing it), and I've always found it hard to use regular expressions to find things that don't match a particular expression. I'm in a Windows environment (using the GnuWin32 port of most GNU tools), so I'm equally open for Windows-only solutions.

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• Logical equality in C

  - by andrew cooke

  [It seems odd this doesn't exist, so apologies in advance if it's a duplicate] I want to test for logical equality in C. In other words, I want to know whether two values would be equal if both were converted in the normal way associated with logical expressions. In C99, I think that (bool)a == (bool)b gives what I want. Is that correct? What is the normal way of writing this in traditional C?

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• Extract information from javascript counter via PHP

  - by Jennifer Weinberg

  Hi, I'm looking for a way to extract some information from this site via PHP: http://www.mycitydeal.co.uk/deals/london There ist a counter where the time left is displayed, but the information is within the JavaScript. Since I'm really a JavaScript rookie, I didn't really know how to get the information. Normally I would extract the information with "preg_match" and some regular expressions. Can someone help me to extract the information (Hrs., Min., Sec.) ? Jennifer

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• regular expression to insert space beetween thousands and hundreds...

  - by pixelboy

  Regular expressions and I aren't quite good friends. So here's the really basic operation i'm trying to do using javascript (jQuery framwork that is). My calculation function return a number, unformated, and i'd like to separate thousands and hundreds by a white space ' '. I'm sure it's pretty easy for a regexp regular user... but for me... Thanks for the help.

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• perl parentheses in regular expression

  - by iamrohitbanga

  I have been trying several regular expressions $str =~ s/^0+(.)/$1/; converts 0000 to 0 and 0001 to 1 $str =~ s/^0+./$1/; converts 0000 to empty string, 000100 to 00, 0001100 to 100. what difference is the parentheses making?

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• DataColumn.Expression Power

  - by Graham

  the following code Dim dc = New DataColumn(name, GetType(Double), "[col1] ^ [col2]") produces the following error: The expression contains unsupported operator '^'. Is this right, is the power operand not support in datacolumn expressions??? Anyone have an idea how i'd write this?

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