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• What grammar based parser-generator tools exist for ruby?

  - by cartoonfox

  What open source (preferably gem-based) parser-generator options do I have in Ruby? I've used (flex&bison)|(lex&yacc) from C in the past, and I'm comfortable with BNF-style specifications. I've heard of treetop, but it looks a bit alien and verbose compared to yacc... Purpose: I want to convert my text markup language to a BNF and generate the parsing code. I think it's a better strategy than my first-order solution: http://github.com/dafydd/semantictext/blob/master/lib/semantictext/rich_text_parser.rb

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• Closest Ruby representation of a 'public static final' class variable in Java?

  - by Hosh

  Given the Java code below, what's the closest you could represent this private static final variable in a Ruby class? public class DeviceController { ... private static final Device myDevice = Device.getDevice("mydevice"); ... public static void main(String args[]) { ... } }

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• Convert Ruby array of tuples into a hash given an array of keys?

  - by Kit Ho

  I have an simple array array = ["apple", "orange", "lemon"] array2 = [["apple", "good taste", "red"], ["orange", "bad taste", "orange"], ["lemon" , "no taste", "yellow"]] how can i convert in to this hash whenever element in array match the first element of each element in array2? hash = {"apple" => ["apple" ,"good taste", "red"], "orange" => ["orange", "bad taste", "orange"], "lemon" => ["lemon" , "no taste", "yellow"] } I am quite new to ruby, and spend a lot to do this manipulation, but no luck, any help ?

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• How to assert certain method is called with Ruby minitest framework?

  - by steven.yang

  I want to test whether a function invokes other functions properly with minitest Ruby, but I cannot find a proper assert to test from the doc. The source code class SomeClass def invoke_function(name) name == "right" ? right () : wrong () end def right #... end def wrong #... end end The test code: describe SomeClass do it "should invoke right function" do # assert right() is called end it "should invoke other function" do # assert wrong() is called end end

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• Can Ruby access output from shell commands as it appears?

  - by Ciryon

  My Ruby script is running a shell command and parsing the output from it. However, it seems the command is first executed and output saved in an array. I would like to be able to access the output lines in real time just as they are printed. I've played around with threads, but haven't got it to work. Any suggestions?

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• scrap data from jsp web with Nokogiri or other ruby tools?

  - by peng

  there is a jsp web: http://xbrl.cninfo.com.cn/XBRL/allinfo.jsp?stkid=000002&getyear=2005&nowpage=Info.jsp&reportType=GB0110 can i scrap data from it with Nokogiri or other ruby tools?

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• Any way to determine which object called a method? [Ruby]

  - by Joe

  I'm hoping that Ruby's message-passing infrastructure means there's some clever trick for this... How do I determine the calling object -- which object called the method I'm currently in?

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• How do I add information to an exception message without changing its class in ruby?

  - by Andrew Grimm

  How do I add information to an exception message without changing its class in ruby? The approach I'm currently using is strings.each_with_index do |string, i| begin do_risky_operation(string) rescue raise $!.class, "Problem with string number #{i}: #{$!}" end end Is there a better way?

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• Is there a simple way to get image dimensions in Ruby?

  - by gruner

  I'm looking for an easy way to get width and height dimensions for image files in Ruby without having to use ImageMagick or ImageScience (running Snow Leapard).

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• Is there any way to use jQuery like Ruby in IRB mode?

  - by adam

  I love using irb to quickly check how my ruby code reacts. Im wondering is there a way to do the same say in Firebug or soem other tool?

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• Can I have a page in my Ruby on Rails app that doesn't use my application.html.erb template?

  - by ben

  I'm using application.html.erb in the views/layouts folder of my Ruby on Rails web app as a template. But there's one page in which I don't want the template to be used. Is this possible?

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• In HAML on Ruby on Rails, how to use the :sass filter?

  - by Jian Lin

  If using HAML on Ruby on Rails, then :sass #someDiv border: 3px dashed orange won't have any <style> tag around them. and then :css :sass #someDiv border: 3px dashed orange won't kick on the :sass filter, but :css :sass #someDiv border: 3px dashed orange will kick on the :sass filter, but it is outside of the <style> tag. So how can the :sass filter be used?

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• In Ruby, how does one get their IP octet without going through DNS?

  - by user30997

  I can, on some of my systems, get my IP address (192.68.m.n format) by doing this: addr = IPSocket::getAddress(Socket.gethostname()) ...the trouble is that this only works if the name the local machine uses for itself is the name the DNS server associates with it. How *&#( hard can it be for ruby to just return its primary interface's IP address? I have to do this in a platform-independant way or I'd just call ifconfig or ipconfig and parse it.

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• How do I link to an item in the public folder from views/controller_name/page1 in Ruby on Rails?

  - by ben

  How do I link to an item in the public folder from views/controller_name/page1 in Ruby on Rails? Thanks for reading.

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• Which is a better source control with NetBeans (Ruby on Rails), VSS or Subversion?

  - by Tushar Maru

  Which is better source control with NetBeans (Ruby on Rails), VSS or subversion? I want to use source control, so I want to know which is better for NetBeans (RoR). Visual Source safe or Subversion?

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• How can I upgrade my Ruby Gems to the latest version "safely"?

  - by leeand00

  Is there any way that I can upgrade my Ruby Gems, and if it doesn't work (on what I'm upgrading them for), than rollback the changes?

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• How do you check the Gem Version in Ruby at Runtime?

  - by viatropos

  Is it possible to check the gem version of the currently loaded gem in a ruby/rails app? During debugging, I would like to be able to do something like: puts RubyGem.loaded_version(:active_support) Anything like that exist?

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• What is the difference between include and require in Ruby?

  - by Owen

  My question is similar to this one over here about include and extend. What's the difference between require and include in Ruby? If I just want to use the methods from a module in my class, should I require it or include it?

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• Is there a nvl() function in Ruby or do I have to write it myself?

  - by jva

  I want to use an equivalent of Oracle's nvl() function in Ruby. Is there a built in function or do I have to write one myself?

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• How do I link to an item in the public folder from views/controller_name/page1.html.erb in Ruby on R

  - by ben

  How do I link to an item in the public folder from views/controller_name/page1.html.erb in Ruby on Rails? Thanks for reading.

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• Can I deploy a Ruby on Rails webapp to an IIS webserver?

  - by Greg

  Can I deploy a Ruby on Rails webapp to an IIS webserver? Is there any solid support for this somehow?

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• What module(s) do I need to include to get 5.seconds to work in Ruby?

  - by DJTripleThreat

  Because apparently require 'date' doesn't include the method hours or seconds etc: undefined method `hours' for 5:Fixnum (NoMethodError) Am I missing something? Is 5.seconds only something you can do in Rails? If so, what is the require statement I need to get this to work in a ruby script?

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• How to safely let users run arbitrary Ruby code?

  - by igul222

  I realize this sounds a little crazy, but I'm working on a project for which I need a server to run user-provided Ruby code and return the result. I'm looking to prevent something like this: system("rm -rf /") eval("something_evil") # etc... I'm sure there must be some reasonably safe way to do this, as it already exists at places like tryruby.org. Any help is greatly appreciated, thanks!

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• where can I find a good ruby excel parser that also had good documentation?

  - by Chris Drappier

  Hi All, I've spent some time today looking for a pure ruby library that will parse an excel workbook. I could find the parseexcel gem in the repos, but the problem is that I can't find any documentation on it. and the rdoc is pitiful. so, my question is 1) is there good documentation out there for this gem? 2) if not, is there another gem that does the same thing that has good documentation? thx :) -C

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• "string_name = string_name[3..-1]" what could the following line of ruby code mean?

  - by Mo

  Hi, I'm looking at some external code and saw a line of Ruby code that looks like this string_name = string_name[3..-1] what does the [n..-x] do or mean? Thanks.

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