Beginner question to a error please
Hi, I just started a hobby project, it download a webbpage, and extract number data witch exits between brStart rad:/SPAN --and -- /TD Example brStart rad:/SPAN01 20 20 52 32 85 89/TD Everything works fine exept -main witch gives a error i don't understand. Becurse i try to learn Clojure, i like to now what's wrong a way :) Here is my code (ns com.persson.extract ;(:import ) ;(:require ) ) (defn remove-endlines [file] (filter #(not= % \newline) (filter #(not= % \return) file))) (defn get-file-without-endlines[file] (remove-endlines (slurp file) )) (defn -main[] (re-find #brStart rad:\/SPAN*.\/TD (get-file-without-endlines E:/testing/data/1999_1.txt ))) And here is the error --- com.persson.extract= (-main) #CompilerException java.lang.ClassCastException: clojure.lang.LazySeq cannot be cast to java.lang.CharSequence (NO_SOURCE_FILE:117) Best regards Anders -- 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: Beginner question to a error please
2010/12/20 uap12 anders.u.pers...@gmail.com Hi, I just started a hobby project, it download a webbpage, and extract number data witch exits between brStart rad:/SPAN --and -- /TD Example brStart rad:/SPAN01 20 20 52 32 85 89/TD Everything works fine exept -main witch gives a error i don't understand. Becurse i try to learn Clojure, i like to now what's wrong a way :) Here is my code (ns com.persson.extract ;(:import ) ;(:require ) ) (defn remove-endlines [file] (filter #(not= % \newline) (filter #(not= % \return) file))) (defn get-file-without-endlines[file] (remove-endlines (slurp file) )) (defn -main[] (re-find #brStart rad:\/SPAN*.\/TD (get-file-without-endlines E:/testing/data/1999_1.txt ))) And here is the error --- com.persson.extract= (-main) #CompilerException java.lang.ClassCastException: clojure.lang.LazySeq cannot be cast to java.lang.CharSequence (NO_SOURCE_FILE:117) The return value of get-file-without-endlines will be a seq of Chars, while re-find expects a CharSequence (generally a String). So to follow in the spirit of your example, you'd have to first convert your seq of Chars back into a string, e.g. via (apply str (get-file-without-endlines )) HTH, -- Laurent Best regards Anders -- 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.comclojure%2bunsubscr...@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: Beginner question to a error please
Tanks very mutch for the help. /Anders -- 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: Beginner question to a error please
On Mon, Dec 20, 2010 at 10:27 AM, uap12 anders.u.pers...@gmail.com wrote: Tanks very mutch for the help. /Anders Of course (apply str ...) will suck the whole file into ram all at once, eagerly. If it's a multi-gigabyte file expect OOME. It would be nice if there was a variation on re support that worked on arbitrary seqs -- seqs of Characters, at least, and preferably (with suitable additional features) perhaps also seqs of other objects. (Ultimately, it always boils down to a test of whether a particular object meets some criterion. Sometimes that's equality with a particular other object; sometimes membership in a range. Using = and, with ranges, compare with the endpoints seems like it should generalize well, but you might want to be able to supply a set of class-comparator pairs. These could be combined into a multimethod under the hood that acts as a global comparator during what followed. Ranges wouldn't always make sense, such as for maps and sets; lists, seqs, and vectors might have a default comparison that generalizes that for strings, though that will wedge if two equal, infinite seqs ever get compared. Then again so will =.) -- 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: Beginner question to a error please
2010/12/20 Ken Wesson kwess...@gmail.com On Mon, Dec 20, 2010 at 10:27 AM, uap12 anders.u.pers...@gmail.com wrote: Tanks very mutch for the help. /Anders Of course (apply str ...) will suck the whole file into ram all at slurp will suffice to suck everything into memory once, eagerly. If it's a multi-gigabyte file expect OOME. It would be nice if there was a variation on re support that worked on arbitrary seqs -- seqs of Characters, at least, and preferably (with suitable additional features) perhaps also seqs of other objects. (Ultimately, it always boils down to a test of whether a particular object meets some criterion. Sometimes that's equality with a particular other object; sometimes membership in a range. Using = and, with ranges, compare with the endpoints seems like it should generalize well, but you might want to be able to supply a set of class-comparator pairs. These could be combined into a multimethod under the hood that acts as a global comparator during what followed. Ranges wouldn't always make sense, such as for maps and sets; lists, seqs, and vectors might have a default comparison that generalizes that for strings, though that will wedge if two equal, infinite seqs ever get compared. Then again so will =.) -- 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.comclojure%2bunsubscr...@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: Beginner question to a error please
On Mon, Dec 20, 2010 at 3:55 PM, Laurent PETIT laurent.pe...@gmail.com wrote: 2010/12/20 Ken Wesson kwess...@gmail.com On Mon, Dec 20, 2010 at 10:27 AM, uap12 anders.u.pers...@gmail.com wrote: Tanks very mutch for the help. /Anders Of course (apply str ...) will suck the whole file into ram all at slurp will suffice to suck everything into memory True. You need a seq view of the file, perhaps with line-seq or perhaps with a seq wrapper around the stream to get a char seq. The latter can probably be hacked up fairly quickly using lazy-seq; it's surprising it's not (to my knowledge) in core, really. -- 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
