Re: funny (?) str behavior
On Feb 23, 10:47 am, Alfred Tarski atar...@gmail.com wrote: Hi, I have this function: (defn wrap [x] (str % x %)) and I do bf= (str boo hoo (map wrap [fdfd ggfs])) boo hoo clojure.lang.lazy...@9e050eb0 This looks odd to me, but if the powers that be consider this to be the right behavior of str then my question is: what do I need to do do get what I want? if you really want the seq to be stringified instead of the elements, just do (str boo hoo (seq (map (wrap [...] I suppose lazy seqs are so lazy they won't even bother to provide a string representation of themselves without coercion :) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Can't get Ring to reload namespace
Great, that makes sense. Thanks very much guys. On Feb 24, 1:00 am, James Reeves weavejes...@googlemail.com wrote: Ah yep, (var app) is probably a better idea than #(app %). - James On Feb 23, 11:55 pm, Mark McGranaghan mmcgr...@gmail.com wrote: Basically because wrap-reload is a function, so app is evaluated before it is passed to wrap-reload. Right. To elaborate, the code (reload/wrap-reload app '(ns1 ns2)) invokes the wrap-reload function with the current value of the app Var, which is a specific and immutable function. The reload middleware may subsequently reload the namespaces and therefore change the value of the app Var, but the value that is used to invoke (app req) within the middleware remains unchanged. I'd therefore suggest passing a Var instead of a function: (reload/wrap-reload (var app) '(ns1 ns2)) In this way, each time app is invoked within the middleware, it first goes to get the current value of the app var and then uses that value to evaluate the request argument; i.e. the reload works. Note that if the implementation of app itself never changes, only the functions that it in turn calls, then the (var app) bit becomes unnecessary. HTH, - Mark -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure-clr how to reference assemblies?
Hi, Some assemblies are loaded by default an can be used directly. But like IronPython, you will need to *explicitly* load most assemblies to be imported into your program. This differs from C# which does it under the hood. The Assemblies can be loaded from the GAC or from a dll if it is not loaded/referenced by default. For example, as System.Console is loaded by default you can directly use: (System.Console/WriteLine Clo[sjz]ure) However, the System.Windows.Forms assembly is not loaded by default. So you would need: (System.Reflection.Assembly/LoadWithPartialName System.Windows.Forms) or (System.Reflection.Assembly/Load System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089) You can then import the MessageBox class (import '(System.Windows.Forms MessageBox)) (MessageBox/Show Clo[sjz]ure) Regards, Iwan On Feb 24, 12:26 am, adam11235 adam.k.web...@gmail.com wrote: Hi, I'm unsure of how to get clojure-clr to reference assemblies that a program needs. I can successfully get this to show a message box via the REPL: (System.Windows.Forms.MessageBox/Show hello world) I can successfully save this to a file, add the file as a command-line arg inside VisualStudio and run the Clojure.Main project which takes the cmd line arg, correctly loads and executes the code However if I save that to a file and then try the following (from the command line, outside of VS, I get an exception: pathTo\Clojure\Clojure.Main\bin\debug\Clojure.Main.Exe c:\clj \helloworld.clj I have also changed the contents of the file to the following, still with no success: 1) (import '(System.Windows.Forms MessageBox )) (MessageBox/Show hello world) 2) (import '(System.Windows.Forms MessageBox )) (System.Windows.Forms.MessageBox/Show hello world) Any hints? Thanks, Adam. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
on-the-fly fn creation, arglist, with-meta, :tag
Guys,
I seem to have thrown myself in at the deep end here !
I'm writing some clojure which interacts very heavily with some pojos,
making, hopefully, millions of method invocations a second.
I tried :
Clojure 1.1.0-new-SNAPSHOT
user= (set! *warn-on-reflection* true)
true
user= (defn fn1 [s] (.length s))
Reflection warning, NO_SOURCE_PATH:15 - reference to field length
can't be resolved.
#'user/fn1
user= (time (dotimes [x 10] (fn1 foo)))
Elapsed time: 2424.1015 msecs
nil
user= (defn fn2 [#^String s] (.length s))
#'user/fn2
user= (time (dotimes [x 10] (fn2 foo)))
Elapsed time: 63.462 msecs
nil
and found that I really needed to take notice of the reflection
warnings for perfomance's sake !
My problem is, that I need to produce functions like the one above, on-
the-fly, from java-side metadata, where both the method name and arg
type are parameterised.
I've spent some time messing around with eval and defmacro and then
found that I was being defeated by the #^ reader macro at every turn,
so I tried switching to using with-meta, but I cannot figure out how
to place metadata correctly on the symbols in the arglist - e.g. :
user= (fn [(with-meta 's {:tag String})] (.length s))
java.lang.Exception: Unsupported binding form: (with-meta (quote s)
{:tag String}) (NO_SOURCE_FILE:30)
most probably because 'fn is a macro and arglist is not expanded as
you might expect, and:
user= (let [arg (with-meta 's {:tag String}) arglist [arg] body (list
'.length arg)] (eval (list 'fn arglist body)))
Reflection warning, NO_SOURCE_PATH:40 - reference to field length
can't be resolved.
#user$eval__168$fn__170 user$eval__168$fn__...@3a1834
user= (*1 foo)
3
The above looks like it worked - but the metadata has been ignored by
the compiler - aaargh !
There must be a way to put together a list/tree of code, at runtime,
that, when evaluated, gives me what I want, by flying beneath the 'fn
macro and/or the #^ reader macro, but at this point I run out of doc
and google-hits :-(
I'd really appreciate some help with this.
thanks,
Jules
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Re: on-the-fly fn creation, arglist, with-meta, :tag
Hi,
On Feb 24, 12:50 pm, Jules jules.gosn...@gmail.com wrote:
user= (let [arg (with-meta 's {:tag String}) arglist [arg] body (list
'.length arg)] (eval (list 'fn arglist body)))
Reflection warning, NO_SOURCE_PATH:40 - reference to field length
can't be resolved.
#user$eval__168$fn__170 user$eval__168$fn__...@3a1834
user= (*1 foo)
3
The following seems to work for me:
user= (defn hinted-fn
[name arg-types args body]
(eval `(defn ~name
~(vec (map #(with-meta %1 {:tag %2}) args arg-
types))
~body)))
#'user/hinted-fn
user= (hinted-fn 'len '[String] '[s] '(.length s))
#'user/len
user= (len Hello)
5
Note, that you also have to quote the argument-types (or use the
classname as a string). Using the class directly does not work:
user= (hinted-fn 'len [String] '[s] '(.length s))
Reflection warning, NO_SOURCE_PATH:7 - reference to field length can't
be resolv
ed.
#'user/len
Sincerely
Meikel
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Re: on-the-fly fn creation, arglist, with-meta, :tag
Meikel,
Thanks for the quick answer.
So I was only one step away from a solution !
I had :
user= (let [arg (with-meta 's {:tag String}) arglist [arg] body (list
'.length arg)] (eval (list 'fn arglist body)))
Reflection warning, NO_SOURCE_PATH:52 - reference to field length
can't be resolved.
#user$eval__210$fn__212 user$eval__210$fn__...@b957ea
user=
when I needed :
user= (let [arg (with-meta 's {:tag java.lang.String}) arglist
[arg] body (list '.length arg)] (eval (list 'fn arglist body)))
#user$eval__198$fn__200 user$eval__198$fn__...@7f58ef
user= (*1 foo)
3
Thanks for your help - much appreciated :-)
Jules
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Re: Strange reflection warning
Here's what I would suspect after running the following at the REPL user= (set! *warn-on-reflection* true) true user= (defn bar [o] (.toString o)) Reflection warning, NO_SOURCE_PATH:605 - reference to field toString can't be resolved. #'user/bar user= (bar 1) 1 How does the reader know the difference between .hashCode and .reallyObsureMethod? It would need to keep a whitelist of everything in object, and know that these methods can be called directly. Maybe the reader should be upgraded to handle this? Could be totally wrong. Sean On Feb 24, 2:56 am, Konrad Hinsen konrad.hin...@fastmail.net wrote: The following trivial code generates a reflection warning for the call to hashCode: (set! *warn-on-reflection* true) (defn foo [o] (.hashCode o)) It's easy to fix: (defn foo [#^Object o] (.hashCode o)) but I don't understand why a type hint for java.lang.Object could ever be necessary. My understanding is (was?) that java.lang.Object is the default type for all function arguments in Clojure. Am I wrong? Konrad. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Var Value from String of varname
I am sure this is really obvious but as I don't know the technical term for what I am trying to do I can't google it (def age 3) then (cons (symbol age) [2 1]) I get (age 2 1) rather than (3 2 1) which is what I was hoping for. Or maybe you cannot do this at runtime? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Enclojure plugin Netbeans
Anyone!!! . Anyway if your using Enclojure etc in Netbeans let me describe exactly what happens when I attempt to install plugin Latest MacOS Snow Leopard NetBeans 6.8 with just Ruby Enclojure plugin from Git File came down with a .zip extention 1. I renamed the file to same name with .nbm extension 2. Went into Netbeans plugin manager.downloads and added the file. I found it and it showed up fine and I could click the install button. 3. the process then runs and it loads when its done ti gave me no choice to restart it just restarted Netbeans. 4. Netbeans closed and restarted but when it came back up the Menu was gone except for Netbeans prefs and the Netbeans Icon was in the Dock. 5. When you attempt to open clicking on the Icon does nothing. You cannot even git rid of it. I actually go into the Activity monitor and kill the Netbeans process, then remove Netbeans and reinstall. 6. When I do Netbeans comes up fine and shows the Enclojure plugin installed. But you cannot activate it. Just wanted to let you know if quickly looking at these iissues you know what the problem is or can suggest something I am sure the plugin will do what I am after fro now once I get it activated. Lar -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
clojure-clr how to wire up a delegate
Hi, I've made progress in creating a simple app to show a windows form, however I am having trouble wiring up a delegate (to handle button clicks). The Java version uses Proxy to implement ActionListener, instead I am just trying to create an EventHandler passing as the 2nd constructor argument the code I would like executed. (see the .add_Click line) The delegate code gets invoked immediately instead of when the button click occurs, and then complains it expected a function pointer rather than the DialogResult it received (due to execution of the code) I tried quoting that code but no success. How do you wire up delegates? (import '(System.Windows.Forms MessageBox Form Button)) (defn windowsPlay [] (let [ win (Form.) temp-button (Button.) ] (.. win (get_Controls) (Add temp-button)) (doto temp-button (.set_Top 50) (.set_Text Clicky) (.add_Click (EventHandler. temp-button (MessageBox/Show I got clicked (doto win (.set_Text hello) (.ShowDialog (windowsPlay) Thanks, Adam. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Posting
I just joined, got confirm, the clicked link. Posted msg to group. got email back confirming but is not showing up in messages Lar -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
getting a library listed on the library page?
I've written an XPath library in clojure that wraps the Java api to make it easier to use from clojure [1]. What is the process for submitting libraries for inclusion on the clojure library page? I'm also not sure if the community feels this is worth including but I thought I'd offer it to see if it is. Best regards, Kyle Burton [1] http://github.com/kyleburton/clj-xpath -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Var Value from String of varname
Have found what I am trying to do eval I am working through the Halloway book, which doesn't seem to have eval in the index, so I probably should excuse myself my ignorance. Is there much a performance impact of using eval,as presumably the compiler can't do much until runtime? Or is the idea of functional languages to delay as much until runtime as possible anyway? On Feb 24, 11:16 am, Quzanti quza...@googlemail.com wrote: I am sure this is really obvious but as I don't know the technical term for what I am trying to do I can't google it (def age 3) then (cons (symbol age) [2 1]) I get (age 2 1) rather than (3 2 1) which is what I was hoping for. Or maybe you cannot do this at runtime? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure-clr how to wire up a delegate
Tried to encapsulate what you want to put in the eventhandler in an anonymous function? And I don't know how that works in Clojure-CLR, but you might need proxy... 2010/2/24 adam11235 adam.k.web...@gmail.com: Hi, I've made progress in creating a simple app to show a windows form, however I am having trouble wiring up a delegate (to handle button clicks). The Java version uses Proxy to implement ActionListener, instead I am just trying to create an EventHandler passing as the 2nd constructor argument the code I would like executed. (see the .add_Click line) The delegate code gets invoked immediately instead of when the button click occurs, and then complains it expected a function pointer rather than the DialogResult it received (due to execution of the code) I tried quoting that code but no success. How do you wire up delegates? (import '(System.Windows.Forms MessageBox Form Button)) (defn windowsPlay [] (let [ win (Form.) temp-button (Button.) ] (.. win (get_Controls) (Add temp-button)) (doto temp-button (.set_Top 50) (.set_Text Clicky) (.add_Click (EventHandler. temp-button (MessageBox/Show I got clicked (doto win (.set_Text hello) (.ShowDialog (windowsPlay) Thanks, Adam. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- Communication is essential. So we need decent tools when communication is lacking, when language capability is hard to acquire... - http://esperanto.net - http://esperanto-jongeren.nl Linux-user #496644 (http://counter.li.org) - first touch of linux in 2004 -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure-clr how to wire up a delegate
Forget about the proxy part, re-read your message... =x 2010/2/24 Joop Kiefte iko...@gmail.com: Tried to encapsulate what you want to put in the eventhandler in an anonymous function? And I don't know how that works in Clojure-CLR, but you might need proxy... 2010/2/24 adam11235 adam.k.web...@gmail.com: Hi, I've made progress in creating a simple app to show a windows form, however I am having trouble wiring up a delegate (to handle button clicks). The Java version uses Proxy to implement ActionListener, instead I am just trying to create an EventHandler passing as the 2nd constructor argument the code I would like executed. (see the .add_Click line) The delegate code gets invoked immediately instead of when the button click occurs, and then complains it expected a function pointer rather than the DialogResult it received (due to execution of the code) I tried quoting that code but no success. How do you wire up delegates? (import '(System.Windows.Forms MessageBox Form Button)) (defn windowsPlay [] (let [ win (Form.) temp-button (Button.) ] (.. win (get_Controls) (Add temp-button)) (doto temp-button (.set_Top 50) (.set_Text Clicky) (.add_Click (EventHandler. temp-button (MessageBox/Show I got clicked (doto win (.set_Text hello) (.ShowDialog (windowsPlay) Thanks, Adam. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- Communication is essential. So we need decent tools when communication is lacking, when language capability is hard to acquire... - http://esperanto.net - http://esperanto-jongeren.nl Linux-user #496644 (http://counter.li.org) - first touch of linux in 2004 -- Communication is essential. So we need decent tools when communication is lacking, when language capability is hard to acquire... - http://esperanto.net - http://esperanto-jongeren.nl Linux-user #496644 (http://counter.li.org) - first touch of linux in 2004 -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Strange reflection warning
On 24.02.2010, at 14:43, Sean Devlin wrote: How does the reader know the difference between .hashCode and .reallyObsureMethod? It would need to keep a whitelist of everything in object, and know that these methods can be called directly. Maybe the reader should be upgraded to handle this? It's not the reader who deals with method lookup, it's the compiler. It doesn't need any whitelist for that. If the compiler knows the (Java) type of a data item, it can look up the available methods statically, i.e. at compile time, and generate a direct method invocation is the lookup succeeds. This works in fact very well, it's the basis of using hints for avoiding reflection. What I am surprised about is that in the absence of any hints, the compiler assumes to know nothing about a value's type, whereas I believe it could safely assume that it is a subclass of java.lang.Object, considering that only primitive types are not subclasses of java.lang.Object, but function arguments cannot be primitive types. But I am not enough of a JVM expert to be sure. Konrad. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Var Value from String of varname
You don't need (and shouldn't use) eval for this: @(resolve (symbol age))) Stu Have found what I am trying to do eval I am working through the Halloway book, which doesn't seem to have eval in the index, so I probably should excuse myself my ignorance. Is there much a performance impact of using eval,as presumably the compiler can't do much until runtime? Or is the idea of functional languages to delay as much until runtime as possible anyway? On Feb 24, 11:16 am, Quzanti quza...@googlemail.com wrote: I am sure this is really obvious but as I don't know the technical term for what I am trying to do I can't google it (def age 3) then (cons (symbol age) [2 1]) I get (age 2 1) rather than (3 2 1) which is what I was hoping for. Or maybe you cannot do this at runtime? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Strange reflection warning
Konrad, Okay, I was looking in the wrong place. Which leads me to suggest the following: Create a local fork of Clojure, make a new branch, and hack on the compiler. Run the experiment, see what happens :) Sean On Feb 24, 9:15 am, Konrad Hinsen konrad.hin...@fastmail.net wrote: On 24.02.2010, at 14:43, Sean Devlin wrote: How does the reader know the difference between .hashCode and .reallyObsureMethod? It would need to keep a whitelist of everything in object, and know that these methods can be called directly. Maybe the reader should be upgraded to handle this? It's not the reader who deals with method lookup, it's the compiler. It doesn't need any whitelist for that. If the compiler knows the (Java) type of a data item, it can look up the available methods statically, i.e. at compile time, and generate a direct method invocation is the lookup succeeds. This works in fact very well, it's the basis of using hints for avoiding reflection. What I am surprised about is that in the absence of any hints, the compiler assumes to know nothing about a value's type, whereas I believe it could safely assume that it is a subclass of java.lang.Object, considering that only primitive types are not subclasses of java.lang.Object, but function arguments cannot be primitive types. But I am not enough of a JVM expert to be sure. Konrad. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Posting
On 24 February 2010 15:40, Larry Wykel lwy...@earthlink.net wrote: I just joined, got confirm, the clicked link. Posted msg to group. got email back confirming but is not showing up in messages Lar It looks like your message about Enclojure did take a little while to come through. [...] Received: by 10.150.251.3 with SMTP id y3mr31409ybh.7.1267019824373; Wed, 24 Feb 2010 05:57:04 -0800 (PST) Received: by 10.150.235.3 with SMTP id i3mr6190769ybh.14.1267017537427; Wed, 24 Feb 2010 05:18:57 -0800 (PST) [...] Perhaps the signature attached to all posts explains this: -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- Michael Wood esiot...@gmail.com -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: getting a library listed on the library page?
Hi, On Feb 24, 2:59 pm, Kyle R. Burton kyle.bur...@gmail.com wrote: I've written an XPath library in clojure that wraps the Java api to make it easier to use from clojure [1]. What is the process for submitting libraries for inclusion on the clojure library page? Instructions on how to get listed are at: http://groups.google.com/group/clojure/browse_thread/thread/affb08d66c048c7f/77f10a8a9a55d089#77f10a8a9a55d089 -- Krešimir Šojat -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Strange reflection warning
On 24.02.2010, at 15:42, Sean Devlin wrote: Create a local fork of Clojure, make a new branch, and hack on the compiler. Run the experiment, see what happens :) Right now I have better ways to use my time than hacking on a compiler that Rich is replacing with a new one written in Clojure! However, I did have a look at the compiler to see if I can find what's going on. I can't claim to have understood everything, so I may be wrong, but this is my current best explanation: no type tag means no method lookup at compile time, thus reflection on all method calls. Presumably one could modify the compiler to put a default type tag of java.lang.Object on all function arguments that don't have a type tag, but if one day the compiler is extended to allow unboxed primitives as function arguments, that would probably fail. Konrad. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Minimax in Clojure – request for code review and a question
Hi all I made a naïve attempt to implement the minimax algorithm in Clojure. I would appreciate any comment on style, wrong (or right) use of idioms etc. Specifically, can I create a “contract” for the function I use, like heuristic, to formalize minimax requirement from it? Thanks Tzach Pseudocode from http://en.wikipedia.org/wiki/Minimax: function integer minimax(node, depth) if node is a terminal node or depth == 0: return the heuristic value of node α = -∞ for child in node: # evaluation is identical for both players α = max(α, -minimax(child, depth-1)) return α My take in Clojure: (defn minimax [pos depth player] minimax implementation, return a pair of the best value and move. Require the following functions: heuristic - return the heuristic value of a pos movegen - return a sequence of legal moves next-pos - return the new position after a move was done (let [moves (movegen pos player)] (if (or (empty? moves) (zero? depth)) [(heuristic pos player) nil] (apply max-key first (cons [- nil] (for [m moves :let [n-pos (next-pos pos m)]] [ (- (first (minimax n-pos (dec depth) (opposite player m ] )) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Minimax in Clojure – request for code review a nd a question
Hello, 2010/2/24 Tzach tzach.livya...@gmail.com: [...] Specifically, can I create a “contract” for the function I use, like heuristic, to formalize minimax requirement from it? Yes, you can add pre- and post- conditions, have a look here: http://clojure.org/special_forms HTH, -- Laurent -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Var Value from String of varname
Thanks. So it isn't a counterexample to my rule of Thumb 'If it is isn't in Halloway you shouldn't be using it' I'll catch you out one day. On Feb 24, 2:19 pm, Stuart Halloway stuart.hallo...@gmail.com wrote: You don't need (and shouldn't use) eval for this: @(resolve (symbol age))) Stu Have found what I am trying to do eval I am working through the Halloway book, which doesn't seem to have eval in the index, so I probably should excuse myself my ignorance. Is there much a performance impact of using eval,as presumably the compiler can't do much until runtime? Or is the idea of functional languages to delay as much until runtime as possible anyway? On Feb 24, 11:16 am, Quzanti quza...@googlemail.com wrote: I am sure this is really obvious but as I don't know the technical term for what I am trying to do I can't google it (def age 3) then (cons (symbol age) [2 1]) I get (age 2 1) rather than (3 2 1) which is what I was hoping for. Or maybe you cannot do this at runtime? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: getting a library listed on the library page?
Thank you! I have not yet picked a license for the library, I am open to any of them, but would like to know what the preferred license is for the project. My first leaning is towards a permissive license such as BSD. What is preferred or recommended for clojure and its libraries? Thank you, Kyle On Wed, Feb 24, 2010 at 10:44 AM, Krešimir Šojat kso...@gmail.com wrote: Hi, On Feb 24, 2:59 pm, Kyle R. Burton kyle.bur...@gmail.com wrote: I've written an XPath library in clojure that wraps the Java api to make it easier to use from clojure [1]. What is the process for submitting libraries for inclusion on the clojure library page? Instructions on how to get listed are at: http://groups.google.com/group/clojure/browse_thread/thread/affb08d66c048c7f/77f10a8a9a55d089#77f10a8a9a55d089 -- Krešimir Šojat -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- -- kyle.bur...@gmail.comhttp://asymmetrical-view.com/ -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: getting a library listed on the library page?
IANAL. The standard seems to be EPL 1.0, because it's what Rich uses for Clojure Contrib. My understanding is that this causes problems w/ the GPL, so you'll probably want to stay away from that. Sean On Feb 24, 1:36 pm, Kyle R. Burton kyle.bur...@gmail.com wrote: Thank you! I have not yet picked a license for the library, I am open to any of them, but would like to know what the preferred license is for the project. My first leaning is towards a permissive license such as BSD. What is preferred or recommended for clojure and its libraries? Thank you, Kyle On Wed, Feb 24, 2010 at 10:44 AM, Krešimir Šojat kso...@gmail.com wrote: Hi, On Feb 24, 2:59 pm, Kyle R. Burton kyle.bur...@gmail.com wrote: I've written an XPath library in clojure that wraps the Java api to make it easier to use from clojure [1]. What is the process for submitting libraries for inclusion on the clojure library page? Instructions on how to get listed are at: http://groups.google.com/group/clojure/browse_thread/thread/affb08d66... -- Krešimir Šojat -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- -- kyle.bur...@gmail.com http://asymmetrical-view.com/ -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Got a Clojure library?
The name of your library clj-xpath Library home page URL http://github.com/kyleburton/clj-xpath Your name Kyle Burton Category (db, web, UI, parsing etc) XML Processing, XPath License EPL A one-paragraph description. Include 3rd party dependencies if any. Simplified XPath Library for Clojure. This library provides a thin layer around basic parsing and XPath interaction for common use cases. 3rd party dependencies are xalan and log4j. The project can be built and installed with maven or used as source. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Map with multiple keys?
Base basselh...@gmail.com writes: So this may be an extraordinary dumb question (even for me...) but is there such a thing as a map with compound keys? [...] I could do map - in - map, or do something like a (str cat gender) to amalgamate 2 fields to set the key but I was just wondering if this even existed. I don't know of anything built-in, but I would prefer [cat gender] over (str cat gender) as keys for a map. -Johann -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure-clr how to wire up a delegate
Hi Adam, You need to use the gen-delegate macro to create delegates, See http://wiki.github.com/richhickey/clojure-clr/clr-interop The signature of the macro is (gen-delegate Type [args] body) whereby in case of event-handlers you would typically use the EventHandler class. The code becomes then: (System.Reflection.Assembly/LoadWithPartialName System.Windows.Forms) (import '(System.Windows.Forms MessageBox Form Button)) (defn windowsPlay [] (let [win (Form.) temp-button (Button.)] (.. win (get_Controls) (Add temp-button)) (doto temp-button (.set_Top 50) (.set_Text Clicky) (.add_Click (gen-delegate EventHandler [sender args] (MessageBox/ Show I got clicked (doto win (.set_Text hello) (.ShowDialog (windowsPlay) Regards, Iwan On Feb 24, 7:43 am, adam11235 adam.k.web...@gmail.com wrote: Hi, I've made progress in creating a simple app to show a windows form, however I am having trouble wiring up a delegate (to handle button clicks). The Java version uses Proxy to implement ActionListener, instead I am just trying to create an EventHandler passing as the 2nd constructor argument the code I would like executed. (see the .add_Click line) The delegate code gets invoked immediately instead of when the button click occurs, and then complains it expected a function pointer rather than the DialogResult it received (due to execution of the code) I tried quoting that code but no success. How do you wire up delegates? (import '(System.Windows.Forms MessageBox Form Button)) (defn windowsPlay [] (let [ win (Form.) temp-button (Button.) ] (.. win (get_Controls) (Add temp-button)) (doto temp-button (.set_Top 50) (.set_Text Clicky) (.add_Click (EventHandler. temp-button (MessageBox/Show I got clicked (doto win (.set_Text hello) (.ShowDialog (windowsPlay) Thanks, Adam. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Enclojure plugin Netbeans
I think I know this one: you need NetBeans with the Java module activated. I had the same problems trying to use NetBeans with just PHP. Mark On Wed, Feb 24, 2010 at 8:18 AM, Larry Wykel lwy...@earthlink.net wrote: Anyone!!! . Anyway if your using Enclojure etc in Netbeans let me describe exactly what happens when I attempt to install plugin Latest MacOS Snow Leopard NetBeans 6.8 with just Ruby Enclojure plugin from Git File came down with a .zip extention 1. I renamed the file to same name with .nbm extension 2. Went into Netbeans plugin manager.downloads and added the file. I found it and it showed up fine and I could click the install button. 3. the process then runs and it loads when its done ti gave me no choice to restart it just restarted Netbeans. 4. Netbeans closed and restarted but when it came back up the Menu was gone except for Netbeans prefs and the Netbeans Icon was in the Dock. 5. When you attempt to open clicking on the Icon does nothing. You cannot even git rid of it. I actually go into the Activity monitor and kill the Netbeans process, then remove Netbeans and reinstall. 6. When I do Netbeans comes up fine and shows the Enclojure plugin installed. But you cannot activate it. Just wanted to let you know if quickly looking at these iissues you know what the problem is or can suggest something I am sure the plugin will do what I am after fro now once I get it activated. Lar -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Prefixed or suffixed symbols?
When it comes to distinguishing certain types of symbols from other things, should one use prefixes or suffixes? Example: naming tests with clojure.test/deftest. If you distinguish your tests’ symbols at all, do you do “t-addition” or “addition-t”? (I need to know what the standard is, if there is any, because I need a way to distinguish a certain type of symbol—those that represent “rules”— in my libraries. I’m using an underscore suffix right now, like “vector_”, which means “vector-rule” But “_rule” might be better, or even “_rule_”, though the last one might be overkill. In the past, I’ve used “vector-r, but I don’t like that now.) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Enclojure plugin Netbeans
Wonderfull. Thanks so Much. Well you know I suspected as much. I did not want all the Java stuff right now. I went on to other things. So tommorow I will do the Java se plugin. '' Again thanks much. Its been fun last five days attempting to get a good Clojure IDE thats good. Larry On Feb 24, 5:15 pm, Mark Nutter manutte...@gmail.com wrote: I think I know this one: you need NetBeans with the Java module activated. I had the same problems trying to use NetBeans with just PHP. Mark On Wed, Feb 24, 2010 at 8:18 AM, Larry Wykel lwy...@earthlink.net wrote: Anyone!!! . Anyway if your using Enclojure etc in Netbeans let me describe exactly what happens when I attempt to install plugin Latest MacOS Snow Leopard NetBeans 6.8 with just Ruby Enclojure plugin from Git File came down with a .zip extention 1. I renamed the file to same name with .nbm extension 2. Went into Netbeans plugin manager.downloads and added the file. I found it and it showed up fine and I could click the install button. 3. the process then runs and it loads when its done ti gave me no choice to restart it just restarted Netbeans. 4. Netbeans closed and restarted but when it came back up the Menu was gone except for Netbeans prefs and the Netbeans Icon was in the Dock. 5. When you attempt to open clicking on the Icon does nothing. You cannot even git rid of it. I actually go into the Activity monitor and kill the Netbeans process, then remove Netbeans and reinstall. 6. When I do Netbeans comes up fine and shows the Enclojure plugin installed. But you cannot activate it. Just wanted to let you know if quickly looking at these iissues you know what the problem is or can suggest something I am sure the plugin will do what I am after fro now once I get it activated. Lar -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email tocloj...@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email toclojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
clojure.lib
I noticed a thread on the clojure developer's google group last night, http://groups.google.com/group/clojure-dev/browse_thread/thread/97e5fa7c49f457b2# I first want to give my vote for including: io seq string I would also like to see seq include more functionality. Two examples, which I use a lot, are: (defn drop-n [n col] Works like nth, but instead of keeping only the nth term, this keeps everything but the nth term. (concat (take (dec n) col) (drop n col))) (defn flatten-n [n coll] Like flatten, but only goes n levels deep. (if (= n 0) coll (recur (dec n) (apply concat (map #(if (sequential? %) % (list %)) coll) There are also ideas for other seq functions at: http://github.com/francoisdevlin/devlinsf-clojure-utils/blob/master/src/lib/sfd/seq_utils.clj -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure-clr how to wire up a delegate
Excellent that worked. For other clojure-clr newbies, the Clojure.Source project has some samples that are helpful. Thanks, Adam. On Feb 25, 7:39 am, soyrochus iwanvanderkle...@gmail.com wrote: Hi Adam, You need to use the gen-delegate macro to create delegates, Seehttp://wiki.github.com/richhickey/clojure-clr/clr-interop The signature of the macro is (gen-delegate Type [args] body) whereby in case of event-handlers you would typically use the EventHandler class. The code becomes then: (System.Reflection.Assembly/LoadWithPartialName System.Windows.Forms) (import '(System.Windows.Forms MessageBox Form Button)) (defn windowsPlay [] (let [win (Form.) temp-button (Button.)] (.. win (get_Controls) (Add temp-button)) (doto temp-button (.set_Top 50) (.set_Text Clicky) (.add_Click (gen-delegate EventHandler [sender args] (MessageBox/ Show I got clicked (doto win (.set_Text hello) (.ShowDialog (windowsPlay) Regards, Iwan On Feb 24, 7:43 am, adam11235 adam.k.web...@gmail.com wrote: Hi, I've made progress in creating a simple app to show a windows form, however I am having trouble wiring up a delegate (to handle button clicks). The Java version uses Proxy to implement ActionListener, instead I am just trying to create an EventHandler passing as the 2nd constructor argument the code I would like executed. (see the .add_Click line) The delegate code gets invoked immediately instead of when the button click occurs, and then complains it expected a function pointer rather than the DialogResult it received (due to execution of the code) I tried quoting that code but no success. How do you wire up delegates? (import '(System.Windows.Forms MessageBox Form Button)) (defn windowsPlay [] (let [ win (Form.) temp-button (Button.) ] (.. win (get_Controls) (Add temp-button)) (doto temp-button (.set_Top 50) (.set_Text Clicky) (.add_Click (EventHandler. temp-button (MessageBox/Show I got clicked (doto win (.set_Text hello) (.ShowDialog (windowsPlay) Thanks, Adam. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Using zip-filter to remove nodes
Hi all, I am trying to use (abuse? *) zip-filter to remove some nodes and return the xml tree to me. If I do something like this: (xml1- zipped-xml zf/descendants :model zip/remove zip/root) I can remove one :model node, but what if I want to remove more than one or all of the :model nodes? If I do this: (xml- zipped-xml zf/descendants :model zip/remove zip/root) I get multiple xml-trees each with one node removed from each. So I wrote a function zip-top to take me back to the top (like zip/root but returns the loc not node) and can do this: (xml- zipped-xml zf/descendants :model zip/remove zip-top zf/ descendants :model zip/remove zip/root) and that will remove two of them but that is not really ideal I would like to remove all of them ... any ideas? am I way off track? is there better ways to manipulate xml trees in clojure? Enlive maybe? I haven't played with it yet. * I realise this probably abusing zip-filter since it is only supposed to take predicates and zip/remove is not really a predicate. James -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Bug in Clojure 1.2 case macro
Ouch. Burned by documented behavior :). Thanks for pointing that out. Seriously, though, I'm not the last that will get confused by this. My suggestion would be to make (case) copy the value from the *var* at compile time and use that. In fact, I decided to do just that and created (case-eval). I hope it's useful to others also: (defn count-from [start] (iterate inc start)) ; like python (defn zip [ lists] (apply map vector lists)) ; like python (defn enumerate [vals] (zip (count-from 0) vals)) (defn map-when-index [p? f vals] (for [[index val] (enumerate vals)] (if (p? index) (f val) val))) (defn eval-all [val] (if (seq? val) (map eval val) (eval val))) ;evals the test cases (defmacro case-eval [e clauses] `(case ~e ~@(map-when-index even? eval-all clauses))) ; these now work: (def *abc* ABC) (case-eval ABC ABC :abc) (case-eval ABC *abc* :abc) (case-eval ABC (*abc*) :abc) Find the full code here: http://gist.github.com/314129 On Feb 23, 10:10 pm, Chouser chou...@gmail.com wrote: On Feb 23, 2010, at 8:47 PM, pthatcher pthatc...@gmail.com wrote: I noticed a funny bug in Clojure 1.2's case macro. It doesn't work with *vars*. For example: (def *a* a) ;this is true (case a a true false) ;but this is false! (case a *a* true false) If you read the first line or two of the docs for case I think you'll see it's not a bug but documented behavior. The values in the case test clauses must be constants, so not a var or local. If you need those test values to be evaluated then your work around of using condp (or cond) is entirely appropriate. --chouser -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Bug in Clojure 1.2 case macro
On Wed, Feb 24, 2010 at 8:57 PM, pthatcher pthatc...@gmail.com wrote: Ouch. Burned by documented behavior :). Thanks for pointing that out. Seriously, though, I'm not the last that will get confused by this. My suggestion would be to make (case) copy the value from the *var* at compile time and use that. But eval at compile time is completely different than eval at runtime, and not generally not useful. ; these now work: (def *abc* ABC) (case-eval ABC ABC :abc) (case-eval ABC *abc* :abc) (case-eval ABC (*abc*) :abc) Sure, but these don't: (let [xyz XYZ] (case-eval XYZ xyz :xyz)) java.lang.RuntimeException: java.lang.RuntimeException: java.lang.UnsupportedOperationException: Can't eval locals (NO_SOURCE_FILE:36) (NO_SOURCE_FILE:36) (def *xyz* update later) (defn xyz? [] (case-eval XYZ *xyz* :xyz)) (def *xyz* XYZ) (xyz?) java.lang.IllegalArgumentException: No matching clause: XYZ (NO_SOURCE_FILE:0) The first case fails because locals don't have values yet when macros used in their scope are being expanded. The second case fails because the var's value is inserted into the expanded code before it's updated. The implementation of 'case' is built around the test values being constants, and when that's what you have offers excellent performance. If your test values are not known until runtime, use 'if', 'cond', or 'condp'. --Chouser http://joyofclojure.com/ -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Using zip-filter to remove nodes
On Wed, Feb 24, 2010 at 8:09 PM, James Sofra james.so...@gmail.com wrote: Hi all, I am trying to use (abuse? *) zip-filter to remove some nodes and return the xml tree to me. If I do something like this: (xml1- zipped-xml zf/descendants :model zip/remove zip/root) I can remove one :model node, but what if I want to remove more than one or all of the :model nodes? If I do this: (xml- zipped-xml zf/descendants :model zip/remove zip/root) I get multiple xml-trees each with one node removed from each. So I wrote a function zip-top to take me back to the top (like zip/root but returns the loc not node) and can do this: (xml- zipped-xml zf/descendants :model zip/remove zip-top zf/ descendants :model zip/remove zip/root) and that will remove two of them but that is not really ideal I would like to remove all of them ... any ideas? am I way off track? is there better ways to manipulate xml trees in clojure? Enlive maybe? I haven't played with it yet. * I realise this probably abusing zip-filter since it is only supposed to take predicates and zip/remove is not really a predicate. You have correctly identified the behavior of zip-filter and its negative consequences. I didn't realize until too late that my design for zip-filter essentially prevents using it to edit more than a single filter result. I haven't thought deeply about what could be done to fix it -- I think it would have to be pretty radical. Instead of returning a lazy seq it would have to have some kind of mechanism for continuation, or perhaps using a monad or one of these new cells. Christophe Grand's enlive lib address a lot of these problems for html and some xml. I'd recommend you take a look at it and see if it would work in your case. --Chouser http://joyofclojure.com/ -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure.lib
Rich has stated in a later thread on the dev list that he's more concerned with library refinement for the time being. The idea seemed to be that our efforts should be placed in getting signatures right improving performance. I'm all for having the what if discussions, but now doesn't seem to be the right time for adding features. Hopefully there will be time for this in the future. Sean On Feb 24, 5:51 pm, cej38 junkerme...@gmail.com wrote: I noticed a thread on the clojure developer's google group last night,http://groups.google.com/group/clojure-dev/browse_thread/thread/97e5f... I first want to give my vote for including: io seq string I would also like to see seq include more functionality. Two examples, which I use a lot, are: (defn drop-n [n col] Works like nth, but instead of keeping only the nth term, this keeps everything but the nth term. (concat (take (dec n) col) (drop n col))) (defn flatten-n [n coll] Like flatten, but only goes n levels deep. (if (= n 0) coll (recur (dec n) (apply concat (map #(if (sequential? %) % (list %)) coll) There are also ideas for other seq functions at:http://github.com/francoisdevlin/devlinsf-clojure-utils/blob/master/s... -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Bug in Clojure 1.2 case macro
On 25 February 2010 03:57, pthatcher pthatc...@gmail.com wrote: [...] (defn count-from [start] (iterate inc start)) ; like python (defn zip [ lists] (apply map vector lists)) ; like python (defn enumerate [vals] (zip (count-from 0) vals)) [...] By the way, there's an implementation of enumerate called indexed in clojure.contrib.seq-utils (or clojure.contrib.seq in master): (defn indexed Returns a lazy sequence of [index, item] pairs, where items come from 's' and indexes count up from zero. (indexed '(a b c d)) = ([0 a] [1 b] [2 c] [3 d]) [s] (map vector (iterate inc 0) s)) Basically the same as yours, but as a single function. Also, if you use it you don't have to write it yourself :) -- Michael Wood esiot...@gmail.com -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
