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• What quality, parser-generator options 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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• Something like PPerl for Ruby?

  - by sal

  I've used PPerl for deamon like processes. This program turns ordinary perl scripts into long running daemons, making subsequent executions extremely fast. It forks several processes for each script, allowing many proceses to call the script at once. Does anyone know of something like this for ruby? Right now I am planing on using a wrapper around curl to call a REST WebService written in Sinatra running on JRuby. I'm hoping there is a simpler option.

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• ruby number to human-readable string conversion

  - by yaya3

  I need to have a list with id's for each list item being #one, #two etc. Is this the most efficient way or am I missing an in built ruby function here? -num_array = ["one", "two", "three", "four", "five", "six", "seven"] -navigation[:primary_level].each_with_index do |primary_item, idx| %li{ :id => "#{num_array[idx]}"}

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• Ruby testing: printing inside a test case

  - by marienbad

  I'm brand new to Ruby testing and Google isn't helping. Using Test/Unit, how can I print an instance variable, like test "thing to happen" do do_stuff assert_equal "foo", @variable p @varible end

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• Ruby IpV6 Multicast Sending and Receive

  - by Francesco Vollero

  Hi, as object i'm tring to create a client and server scripts in order to send and receive multicast packages over IPv6. In IPv4 everything work as well, but i cannot figure out how to change it in IPv6. I start as basis from Multicasting In Ruby but seems ff02::1 isnt good for MULTICAST_ADDR. Thanks in advance.

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• Package ruby gui app

  - by GummyBEARZ

  What is the best way to make my Qt Ruby application into an executable and distribute on windows? I have seen rubyscript2exe but it looks abandoned.

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• Mac text editor for Ruby on Rails

  - by kingjeffrey

  My text editor of choice for PHP work is Panic's Coda. But for Ruby on Rails, it's autocomplete feature is continuously in my way and ROR's standardization on 2 space tabs does not play well with Coda's settings. I've been going back to TextMate for ROR work, but was wondering if there were better options.

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• Detect similar sounding words in Ruby

  - by JP

  I'm aware of SOUNDEX and (double) Metaphone, but these don't let me test for the similarity of words as a whole - for example "Hi" sounds very similar to "Bye", but both of these methods will mark them as completely different. Are there any libraries in Ruby, or any methods you know of, that are capable of determining the similarity between two words? (Either a boolean is/isn't similar, or numerical 40% similar) edit: Extra bonus points if there is an easy method to 'drop in' a different dialect or language!

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• How to simplify ruby block with one argument?

  - by Gabriel Šcerbák

  Somewhere i saw a way to simplify ruby blocks with one argument, it basically omitted vertical bars and argument declaration, because it was somehow inlined. I cannot find it anymore or remember any names t osearch for. Can you help?

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• Ruby - print the variable name and then its value

  - by tyndall

  What is the best way to write a function (or something DSLish) that will allow me to write this code in Ruby. How would I construct the function write_pair? username = "tyndall" write_pair username # where write_pair username outputs username: tyndall Is it possible to do? Looking for the most simple way to do this.

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• Trying to reference a hash using a string value in Ruby

  - by Jim

  How would I refer to a hash using the value of a string - i.e. #!/usr/bin/env ruby foo = Hash.new bar = "foo" "#{bar}"["key"] = "value" results in foo:5:in `[]=': string not matched (IndexError) from foo:5 How do I use the value of bar (foo) to reference the hash named foo? Thanks!

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• Converting an empty string into nil in Ruby

  - by adi92

  I have a string called word and a function called infinitive such that word.infinitive would return another string on some occasions and an empty string otherwise I am trying to find an elegant ruby one line expression for the code-snippet below if word.infinitive == "" return word else return word.infinitive Had infinitive returned nil instead of "", I could have done something like (word.infinitive or word) But since it does not, I can't take advantage of the short-circuit OR Ideally I would want 1) a single expression that I could easily embed in other code 2) the function infinitive being called only once 3) to not add any custom gems or plugins into my code

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• Ruby: How to get the first character of a string

  - by Shpigford

  How can I get the first character in a string using Ruby? Ultimately what I'm doing is taking someone's last name and just creating an initial out of it. So if the string was "Smith" I just want "S".

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• How I know my document's size inside MongoDB with the ruby driver

  - by shingara

  Hi, The limitation of one document in MongoDB is 4Mo. I have some documents really heavy with a lot of data. How I know my document's size inside MongoDB with the ruby driver ?

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• Ruby 1.9 Ramaze App Failing with "Illegal instruction"

  - by pkulak

  I've got an app that I'm trying to get working again after wiping my system and installing Snow Leopard. I installed Ruby 1.9 from Macports (now a later version) and the dev server starts up just fine, but then dies on the first request, only telling me "Illegal instruction". I have no idea what's causing this or even how to go about debugging it. Does anyone have any ideas?

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• Restricting Edit and Delete in Ruby on Rails

  - by phleet

  I want to be able to edit and delete resources myself, but not allow users of the application to do so. Is there an easy way of doing this in Rails? An incomplete solution would be just to remove the "delete" and "edit" buttons from the index view, but that doesn't disable their ability to do so via direct HTTP requests. Running Rails 2.2.2 and ruby 1.8.7

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• Arbitrary precision arithmetic with Ruby

  - by macek

  How the heck does Ruby do this? Does Jörg or anyone else know what's happening behind the scenes? irb(main):001:0> 999**999 368063488259223267894700840060521865838338232037353204655959621437025609300472231530103873614505175218691345257589896391130393189447969771645832382192366076536631132001776175977932178658703660778465765811830827876982014124022948671975678131724958064427949902810498973271030787716781467419524180040734398996952930832508934116945966120176735120823151959779536852290090377452502236990839453416790640456116471139751546750048602189291028640970574762600185950226138244530187489211615864021135312077912018844630780307462205252807737757672094320692373101032517459518497524015120165166724189816766397247824175394802028228160027100623998873667435799073054618906855460488351426611310634023489044291860510352301912426608488807462312126590206830413782664554260411266378866626653755763627796569082931785645600816236891168141774993267488171702172191072731069216881668294625679492696148976999868715671440874206427212056717373099639711168901197440416590226524192782842896415414611688187391232048327738965820265934093108172054875188246591760877131657895633586576611857277011782497943522945011248430439201297015119468730712364007639373910811953430309476832453230123996750235710787086641070310288725389595138936784715274150426495416196669832679980253436807864187160054589045664027158817958549374490512399055448819148487049363674611664609890030088549591992466360050042566270348330911795487647045949301286614658650071299695652245266080672989921799342509291635330827874264789587306974472327718704306352445925996155619153783913237212716010410294999877569745287353422903443387562746452522860420416689019732913798073773281533570910205207767157128174184873357050830752777900041943256738499067821488421053870869022738698816059810579221002560882999884763252161747566893835178558961142349304466506402373556318707175710866983035313122068321102457824112014969387225476259342872866363550383840720010832906695360553556647545295849966279980830561242960013654529514995113584909050813015198928283202189194615501403435553060147713139766323195743324848047347575473228198492343231496580885057330510949058490527738662697480293583612233134502078182014347192522391449087738579081585795613547198599661273567662441490401862839817822686573112998663038868314974259766039340894024308383451039874674061160538242392803580758232755749310843694194787991556647907091849600704712003371103926967137408125713631396699343733288014254084819379380555174777020843568689927348949484201042595271932630685747613835385434424807024615161848223715989797178155169951121052285149157137697718850449708843330475301440373094611119631361702936342263219382793996895988331701890693689862459020775599439506870005130750427949747071390095256759203426671803377068109744629909769176319526837824364926844730545524646494321826241925107158040561607706364484910978348669388142016838792902926158979355432483611517588605967745393958061959024834251565197963477521095821435651996730128376734574843289089682710350244222290017891280419782767803785277960834729869249991658417000499998999

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• select for update with ruby oci8

  - by ash34

  how do I do a 'select for update' and then 'update' the row using ruby oci8. I have two fields counter1 and counter2 in a table which has only 1 record. I want to select the values from this table and then increment them by locking the row using select for update. thanks.

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• Retaining Form data after POST in Ruby on Rails

  - by Shreyas Satish

  Hai I need to retain the Form data submitted in one view to be used in another view. I'll be using POST method to submit the data. Is there anyway I can retrieve data from the POST method in Ruby, like in PHP I would use $title=$_POST["title"]. Any ideas? Thanks and Cheers !

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• Ruby on Rails form page caching including authenticity_token

  - by jacob

  I have a simple Ruby on Rails form which includes an authenticity_token. Unfortunatly, I missed that when you page cache this page then the Authenticity Token becomes invalid. I'm glad I figured it out however. How do you solve caching in such a case?

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• Parse string as if it were a querystring in Ruby on Rails

  - by Koning WWWWWWWWWWWWWWWWWWWWWWW

  I have a string like this: "foo=bar&bar=foo&hello=hi" Does Ruby on Rails provide methods to parse this as if it is a querystring, so I get a hash like this: { :foo => "bar", :bar => "foo", :hello => "hi" } Or must I write it myself? EDIT Please note that the string above is not a real querystring from a URL, but rather a string stored in a cookie from Facebook Connect.

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• In Ruby on Rails, routes.rb, if map.something will create something_path and something_url, does map

  - by Jian Lin

  In Ruby on Rails, routes.rb, if we create a "named route" map.something ":a/:b", :controller => 'foobar' it will also create something_path and something_url which are two methods usable in the controller and in the view. Does map.connect create something like that too? Otherwise, isn't map.connect somewhat disadvantaged in this way? I checked that connect_path and connect_url both aren't created automatically.

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• Read from a file into an array and stop if a ":" is found in ruby

  - by Minky

  Hi! How can I in Ruby read a string from a file into an array and only read and save in the array until I get a certain marker such as ":" and stop reading? Any help would be much appreciated =) For example: 10.199.198.10:111 test/testing/testing (EST-08532522) 10.199.198.12:111 test/testing/testing (EST-08532522) 10.199.198.13:111 test/testing/testing (EST-08532522) Should only read the following and be contained in the array: 10.199.198.10 10.199.198.12 10.199.198.13

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• Ruby background service

  - by FancyDancy

  I have a TCPclient written on Ruby. I want to use it in background. Currently it has a loop: loop do end So i can run a client, and it works forever. Is there a way to run in as a service, and write a pid to file, then i'll able to kill that process by pid?

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• How do I REALLY get started programming in Ruby on Rails

  - by Nate

  I can't figure out where exactly to go in order to write the Ruby code itself. I know that I can enter things line-by-line in Terminal (I'm on a Mac), but I'd like to figure out how to start using something like Xdrive (Apple won't allow me to download Xrive because I have OS X 10.5, not 10.6). What steps do I need to take in order to start writing code in a program like xDrive. Thank you in advance.

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