- Haskell-Cafe - Haskell.org

Re: [Haskell-cafe] Haskell syntax inside QuasiQuote
by Matt Morrow 28 Oct '08

28 Oct '08

> Is there a simple way to do this, i.e. using existing libraries? Yes indeed. I'll be traveling over the next two days, and am shooting for a fully functional hackage release by mid next week. > What I need is a Haskell expression parser which outputs values of type > Language.Haskell.TH.Syntax.QExp, but I can't see one available in the TH > libraries, or in the haskell-src(-exts) libraries. My strategy is to use the existing haskell-src-exts parser, then translate that AST to the TH AST. Once I've got settled in one place, I'll follow up with a brain dump :) > Cheers, > Reiner Matt

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Cabal and GHCi
by Reiner Pope 28 Oct '08

28 Oct '08

Hi, Is there a way to use GHCi with code which is cabal-buildable but not "ghc --make"-able? The emacs haskell-mode makes a pretty good guess by :cd-ing into the directory with the .cabal file; however, if there is a different source-dir this doesn't work so well. A number of more advanced cabal features are even harder to handle. Cheers, Reiner

2 2

What's this algebraic structure called?
by Richard O'Keefe 28 Oct '08

28 Oct '08

Is there a special name for an operator monoid where the structure that's acted on is an Abelian group?

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Problems building HOC
by Colin Fleming 28 Oct '08

28 Oct '08

Hi all, I'm trying to get HOC to build because I'd like to take Yi for a spin and see how it works. I followed the instructions in the Yi README, but I can't get HOC to build. It seems like HOC is under pretty heavy development right now, so maybe this is something transient. I didn't build libffi because according to the Yi docs that's not required on Leopard. HOC built and installed ok, however it failed on the bindings generation step - I've pasted the full compile output below. Am I doing something daft? I'm an (almost) total Haskell newbie so this is entirely possible... I'm using GHC 6.8.2 from MacPorts, and OSX 10.5.5. Thanks for any help! Cheers, Colin ~/dev/haskell/hoc/Bindings> bash make-bindings-macos.sh --user *** Processing Framework Foundation *** NSObjCRuntime.h:139:32: NSIntegerMax undefined [ ] NSObjCRuntime.h:139:32: Couldn't handle enum value for NSNotFound ] NSPropertyList.h:13:55: kCFPropertyListImmutable undefined ] NSPropertyList.h:13:55: Couldn't handle enum value for NSPropertyListImmutable ] NSPropertyList.h:14:71: kCFPropertyListMutableContainers undefined ] NSPropertyList.h:14:71: Couldn't handle enum value for NSPropertyListMutableContainers NSPropertyList.h:16:1: kCFPropertyListMutableContainersAndLeaves undefined ] NSPropertyList.h:16:1: Couldn't handle enum value for NSPropertyListMutableContainersAndLeaves NSPropertyList.h:20:65: kCFPropertyListOpenStepFormat undefined ] NSPropertyList.h:20:65: Couldn't handle enum value for NSPropertyListOpenStepFormat NSPropertyList.h:21:65: kCFPropertyListXMLFormat_v1_0 undefined ] NSPropertyList.h:21:65: Couldn't handle enum value for NSPropertyListXMLFormat_v1_0 NSPropertyList.h:23:1: kCFPropertyListBinaryFormat_v1_0 undefined NSPropertyList.h:23:1: Couldn't handle enum value for NSPropertyListBinaryFormat_v1_0 NSNumberFormatter.h:39:57: kCFNumberFormatterNoStyle undefined******* ] NSNumberFormatter.h:39:57: Couldn't handle enum value for NSNumberFormatterNoStyle NSNumberFormatter.h:40:67: kCFNumberFormatterDecimalStyle undefined NSNumberFormatter.h:40:67: Couldn't handle enum value for NSNumberFormatterDecimalStyle NSNumberFormatter.h:41:69: kCFNumberFormatterCurrencyStyle undefined NSNumberFormatter.h:41:69: Couldn't handle enum value for NSNumberFormatterCurrencyStyle NSNumberFormatter.h:42:67: kCFNumberFormatterPercentStyle undefined NSNumberFormatter.h:42:67: Couldn't handle enum value for NSNumberFormatterPercentStyle NSNumberFormatter.h:43:73: kCFNumberFormatterScientificStyle undefined NSNumberFormatter.h:43:73: Couldn't handle enum value for NSNumberFormatterScientificStyle NSNumberFormatter.h:45:1: kCFNumberFormatterSpellOutStyle undefined NSNumberFormatter.h:45:1: Couldn't handle enum value for NSNumberFormatterSpellOutStyle NSNumberFormatter.h:189:73: kCFNumberFormatterPadBeforePrefix undefined NSNumberFormatter.h:189:73: Couldn't handle enum value for NSNumberFormatterPadBeforePrefix NSNumberFormatter.h:190:71: kCFNumberFormatterPadAfterPrefix undefined NSNumberFormatter.h:190:71: Couldn't handle enum value for NSNumberFormatterPadAfterPrefix NSNumberFormatter.h:191:73: kCFNumberFormatterPadBeforeSuffix undefined NSNumberFormatter.h:191:73: Couldn't handle enum value for NSNumberFormatterPadBeforeSuffix NSNumberFormatter.h:193:1: kCFNumberFormatterPadAfterSuffix undefined NSNumberFormatter.h:193:1: Couldn't handle enum value for NSNumberFormatterPadAfterSuffix NSNumberFormatter.h:200:67: kCFNumberFormatterRoundCeiling undefined NSNumberFormatter.h:200:67: Couldn't handle enum value for NSNumberFormatterRoundCeiling NSNumberFormatter.h:201:63: kCFNumberFormatterRoundFloor undefined NSNumberFormatter.h:201:63: Couldn't handle enum value for NSNumberFormatterRoundFloor NSNumberFormatter.h:202:61: kCFNumberFormatterRoundDown undefined NSNumberFormatter.h:202:61: Couldn't handle enum value for NSNumberFormatterRoundDown NSNumberFormatter.h:203:57: kCFNumberFormatterRoundUp undefined NSNumberFormatter.h:203:57: Couldn't handle enum value for NSNumberFormatterRoundUp NSNumberFormatter.h:204:69: kCFNumberFormatterRoundHalfEven undefined NSNumberFormatter.h:204:69: Couldn't handle enum value for NSNumberFormatterRoundHalfEven NSNumberFormatter.h:205:69: kCFNumberFormatterRoundHalfDown undefined NSNumberFormatter.h:205:69: Couldn't handle enum value for NSNumberFormatterRoundHalfDown NSNumberFormatter.h:207:1: kCFNumberFormatterRoundHalfUp undefined NSNumberFormatter.h:207:1: Couldn't handle enum value for NSNumberFormatterRoundHalfUp NSDecimal.h:49:1: problem parsing struct 61% [*************** ] NSDateFormatter.h:40:53: kCFDateFormatterNoStyle undefined*************** ] NSDateFormatter.h:40:53: Couldn't handle enum value for NSDateFormatterNoStyle NSDateFormatter.h:41:59: kCFDateFormatterShortStyle undefined NSDateFormatter.h:41:59: Couldn't handle enum value for NSDateFormatterShortStyle NSDateFormatter.h:42:61: kCFDateFormatterMediumStyle undefined NSDateFormatter.h:42:61: Couldn't handle enum value for NSDateFormatterMediumStyle NSDateFormatter.h:43:57: kCFDateFormatterLongStyle undefined NSDateFormatter.h:43:57: Couldn't handle enum value for NSDateFormatterLongStyle NSDateFormatter.h:45:1: kCFDateFormatterFullStyle undefined NSDateFormatter.h:45:1: Couldn't handle enum value for NSDateFormatterFullStyle NSCalendar.h:16:47: kCFCalendarUnitEra undefined 79% [******************* ] NSCalendar.h:16:47: Couldn't handle enum value for NSEraCalendarUnit NSCalendar.h:17:49: kCFCalendarUnitYear undefined NSCalendar.h:17:49: Couldn't handle enum value for NSYearCalendarUnit NSCalendar.h:18:51: kCFCalendarUnitMonth undefined NSCalendar.h:18:51: Couldn't handle enum value for NSMonthCalendarUnit NSCalendar.h:19:47: kCFCalendarUnitDay undefined NSCalendar.h:19:47: Couldn't handle enum value for NSDayCalendarUnit NSCalendar.h:20:49: kCFCalendarUnitHour undefined NSCalendar.h:20:49: Couldn't handle enum value for NSHourCalendarUnit NSCalendar.h:21:53: kCFCalendarUnitMinute undefined NSCalendar.h:21:53: Couldn't handle enum value for NSMinuteCalendarUnit NSCalendar.h:22:53: kCFCalendarUnitSecond undefined NSCalendar.h:22:53: Couldn't handle enum value for NSSecondCalendarUnit NSCalendar.h:23:49: kCFCalendarUnitWeek undefined NSCalendar.h:23:49: Couldn't handle enum value for NSWeekCalendarUnit NSCalendar.h:24:55: kCFCalendarUnitWeekday undefined NSCalendar.h:24:55: Couldn't handle enum value for NSWeekdayCalendarUnit NSCalendar.h:25:69: kCFCalendarUnitWeekdayOrdinal undefined NSCalendar.h:25:69: Couldn't handle enum value for NSWeekdayOrdinalCalendarUnit NSCalendar.h:70:61: kCFCalendarComponentsWrap undefined NSCalendar.h:70:61: Couldn't handle enum value for NSWrapCalendarComponents NSCalendar.h:93:1: NSIntegerMax undefined NSCalendar.h:93:1: Couldn't handle enum value for NSUndefinedDateComponent NSByteOrder.h:9:45: CFByteOrderUnknown undefined NSByteOrder.h:9:45: Couldn't handle enum value for NS_UnknownByteOrder Parsing Objective-C header files: 100% [*************************] Building initial entities: 100% [*************************] Resolving cross-references: 100% [*************************] Converting types: 100% [*************************] Zapping unconvertable entities: 100% [*************************] Filling in additional instance declarations: 100% [*************************] Combining duplicate entities: 100% [*************************] Resolving name conflicts: 100% [*************************] Eliminating redundant instances: 100% [*************************] Writing binding modules: 100% [*************************] Writing Foundation.hs: 100% [*************************] Writing Foundation.pi: 100% [*************************] done. ~/dev/haskell/hoc/Bindings/Generated/HOC-Foundation ~/dev/haskell/hoc/Bindings/Generated Configuring HOC-Foundation-1.0... Preprocessing library HOC-Foundation-1.0... Building HOC-Foundation-1.0... [ 2 of 154] Compiling Foundation.NSProxy[boot] ( Foundation/NSProxy.hs-boot, dist/build/Foundation/NSProxy.o-boot ) [ 3 of 154] Compiling Foundation.NSObject[boot] ( Foundation/NSObject.hs-boot, dist/build/Foundation/NSObject.o-boot ) [ 4 of 154] Compiling Foundation.NSPort[boot] ( Foundation/NSPort.hs-boot, dist/build/Foundation/NSPort.o-boot ) [ 5 of 154] Compiling Foundation.NSScanner[boot] ( Foundation/NSScanner.hs-boot, dist/build/Foundation/NSScanner.o-boot ) [ 6 of 154] Compiling Foundation.NSScriptCommand[boot] ( Foundation/NSScriptCommand.hs-boot, dist/build/Foundation/NSScriptCommand.o-boot ) [ 7 of 154] Compiling Foundation.NSScriptCommandDescription[boot] ( Foundation/NSScriptCommandDescription.hs-boot, dist/build/Foundation/NSScriptCommandDescription.o-boot ) [ 8 of 154] Compiling Foundation.NSScriptObjectSpecifiers[boot] ( Foundation/NSScriptObjectSpecifiers.hs-boot, dist/build/Foundation/NSScriptObjectSpecifiers.o-boot ) [ 9 of 154] Compiling Foundation.NSSet[boot] ( Foundation/NSSet.hs-boot, dist/build/Foundation/NSSet.o-boot ) [ 10 of 154] Compiling Foundation.NSStream[boot] ( Foundation/NSStream.hs-boot, dist/build/Foundation/NSStream.o-boot ) [ 11 of 154] Compiling Foundation.NSString[boot] ( Foundation/NSString.hs-boot, dist/build/Foundation/NSString.o-boot ) [ 12 of 154] Compiling Foundation.NSTimeZone[boot] ( Foundation/NSTimeZone.hs-boot, dist/build/Foundation/NSTimeZone.o-boot ) [ 13 of 154] Compiling Foundation.NSTimer[boot] ( Foundation/NSTimer.hs-boot, dist/build/Foundation/NSTimer.o-boot ) [ 14 of 154] Compiling Foundation.NSURL[boot] ( Foundation/NSURL.hs-boot, dist/build/Foundation/NSURL.o-boot ) [ 15 of 154] Compiling Foundation.NSValue[boot] ( Foundation/NSValue.hs-boot, dist/build/Foundation/NSValue.o-boot ) [ 16 of 154] Compiling Foundation.NSXMLNode[boot] ( Foundation/NSXMLNode.hs-boot, dist/build/Foundation/NSXMLNode.o-boot ) [ 17 of 154] Compiling Foundation.NSXMLDTDNode[boot] ( Foundation/NSXMLDTDNode.hs-boot, dist/build/Foundation/NSXMLDTDNode.o-boot ) [ 18 of 154] Compiling Foundation.NSXMLDocument[boot] ( Foundation/NSXMLDocument.hs-boot, dist/build/Foundation/NSXMLDocument.o-boot ) [ 19 of 154] Compiling Foundation.NSXMLElement[boot] ( Foundation/NSXMLElement.hs-boot, dist/build/Foundation/NSXMLElement.o-boot ) [ 23 of 154] Compiling Foundation.NSNotification[boot] ( Foundation/NSNotification.hs-boot, dist/build/Foundation/NSNotification.o-boot ) [ 24 of 154] Compiling Foundation.NSMethodSignature[boot] ( Foundation/NSMethodSignature.hs-boot, dist/build/Foundation/NSMethodSignature.o-boot ) [ 25 of 154] Compiling Foundation.NSLocale[boot] ( Foundation/NSLocale.hs-boot, dist/build/Foundation/NSLocale.o-boot ) [ 26 of 154] Compiling Foundation.NSInvocation[boot] ( Foundation/NSInvocation.hs-boot, dist/build/Foundation/NSInvocation.o-boot ) [ 27 of 154] Compiling Foundation.NSIndexSet[boot] ( Foundation/NSIndexSet.hs-boot, dist/build/Foundation/NSIndexSet.o-boot ) [ 28 of 154] Compiling Foundation.NSGeometry ( Foundation/NSGeometry.hs, dist/build/Foundation/NSGeometry.o ) Loading package base ... linking ... done. Loading package array-0.1.0.0 ... linking ... done. Loading package bytestring-0.9.0.1 ... linking ... done. Loading package containers-0.1.0.1 ... linking ... done. Loading package old-locale-1.0.0.0 ... linking ... done. Loading package old-time-1.0.0.0 ... linking ... done. Loading package filepath-1.1.0.0 ... linking ... done. Loading package directory-1.0.0.0 ... linking ... done. Loading package mtl-1.1.0.0 ... linking ... done. Loading package fgl-5.4.1.1 ... linking ... done. Loading package parsec-3.0.0 ... linking ... done. Loading package pretty-1.0.0.0 ... linking ... done. Loading package packedstring-0.1.0.0 ... linking ... done. Loading package template-haskell ... linking ... done. Loading package unix-2.3.0.0 ... linking ... done. Loading package HOC-1.0 ... linking ... done. Foundation/NSGeometry.hs:36:8: Not in scope: data constructor `NSRect' Foundation/NSGeometry.hs:36:16: Not in scope: data constructor `NSPoint' Foundation/NSGeometry.hs:36:30: Not in scope: data constructor `NSSize' Foundation/NSGeometry.hs:37:8: Not in scope: data constructor `NSRect' Foundation/NSGeometry.hs:37:16: Not in scope: data constructor `NSPoint' Foundation/NSGeometry.hs:37:30: Not in scope: data constructor `NSSize' Foundation/NSGeometry.hs:38:8: Not in scope: data constructor `NSRect' Foundation/NSGeometry.hs:38:16: Not in scope: data constructor `NSPoint' Foundation/NSGeometry.hs:38:30: Not in scope: data constructor `NSSize' Foundation/NSGeometry.hs:39:8: Not in scope: data constructor `NSRect' Foundation/NSGeometry.hs:39:16: Not in scope: data constructor `NSPoint' Foundation/NSGeometry.hs:39:30: Not in scope: data constructor `NSSize' Foundation/NSGeometry.hs:40:8: Not in scope: data constructor `NSRect' Foundation/NSGeometry.hs:40:16: Not in scope: data constructor `NSPoint' Foundation/NSGeometry.hs:40:30: Not in scope: data constructor `NSSize' Foundation/NSGeometry.hs:41:8: Not in scope: data constructor `NSRect' Foundation/NSGeometry.hs:41:16: Not in scope: data constructor `NSPoint' Foundation/NSGeometry.hs:41:30: Not in scope: data constructor `NSSize' Foundation/NSGeometry.hs:42:9: Not in scope: data constructor `NSRect' Foundation/NSGeometry.hs:42:17: Not in scope: data constructor `NSPoint' Foundation/NSGeometry.hs:42:31: Not in scope: data constructor `NSSize' Foundation/NSGeometry.hs:43:10: Not in scope: data constructor `NSRect' Foundation/NSGeometry.hs:43:18: Not in scope: data constructor `NSPoint' Foundation/NSGeometry.hs:43:32: Not in scope: data constructor `NSSize'

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Re: [Haskell] IORef sharing
by Bulat Ziganshin 27 Oct '08

27 Oct '08

Hello Rodney, Tuesday, October 28, 2008, 1:27:26 AM, you wrote: > Now I define an IORef and a couple of counters that share > the IORef, >> iio :: IO (IORef Int) >> iio = newIORef 0 >> ic1 = do { io <- iio ; count io 0 } >> ic2 = do { io <- iio ; count io 0 } > So apparently my mental picture of an IORef as a pointer > to a value is wrong. I need a new mental picture. What's > going on here? this part is right. but "iio = newIORef 0" doesn't define IORef, instead it defines *operation* that creates new IORef and returns it then ic1 and ic2 are *operations* that performs iio, creating new IORef on each call, and then use this new IORef in further operation look at http://haskell.org/haskellwiki/IO_inside -- Best regards, Bulat mailto:Bulat.Ziganshin@gmail.com

1 0

Problem with haddock 2.3.0
by Leonidas Fegaras 27 Oct '08

27 Oct '08

You have received a secure message. Read your secure message by opening the attachment, securedoc.html. You will be prompted to open (view) the file or save (download) it to your computer. For best results, save the file first, then open it in a Web browser. To access from a mobile device, forward this message to mobile(a)res.cisco.com to receive a mobile login URL. If you have concerns about the validity of this message, contact the sender directly. First time users - will need to register after opening the attachment. Help - https://res.cisco.com/websafe/help?topic=RegEnvelope About Cisco Registered Email Service - https://res.cisco.com/websafe/about">https://res.cisco.com/websafe/about

1 0

Problem with haddock 2.3.0
by Fegaras, Leonidas 27 Oct '08

27 Oct '08

You have received a secure message. Read your secure message by opening the attachment, securedoc.html. You will be prompted to open (view) the file or save (download) it to your computer. For best results, save the file first, then open it in a Web browser. To access from a mobile device, forward this message to mobile(a)res.cisco.com to receive a mobile login URL. If you have concerns about the validity of this message, contact the sender directly. First time users - will need to register after opening the attachment. Help - https://res.cisco.com/websafe/help?topic=RegEnvelope About Cisco Registered Email Service - https://res.cisco.com/websafe/about">https://res.cisco.com/websafe/about

2 1

Re: [Haskell-cafe] Why 'round' does not just round numbers ?
by Janis Voigtlaender 27 Oct '08

27 Oct '08

Felipe Lessa wrote: > On Mon, Oct 27, 2008 at 8:15 AM, Janis Voigtlaender > <voigt(a)tcs.inf.tu-dresden.de> wrote: > >>That is of course true (and was the topic of heated discussion with my >>fourth grade math teacher), but does not explain 2.5 -> 2. > > > If you round to odd instead of round to even, then 4.5 rounds to 5, Well, of course I did not learn to round to odd. I learned to round .5 to above, but not to do repeated rounding. So we would never have either of > 2.45 -> 2.4 -> 2 > 2.45 -> 2.5 -> 3 as you suggest. Instead, always in one go: 2.45 -> 2 Because of the 4, whereas any digit following it would be ignored: 2.4x -> x In fact, by your explanation, you would have: 3.46 -> 3.5 -> 4 Which is most odd. 3.46 is definitely closer to 3 than to 4. -- Dr. Janis Voigtlaender http://wwwtcs.inf.tu-dresden.de/~voigt/ mailto:voigt@tcs.inf.tu-dresden.de

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Haskell on the JVM
by David Leimbach 27 Oct '08

27 Oct '08

Are there, or have there been Haskell ports to the JVM? Are any of them alive and well? Is there an interest in hosting GHC on the JVM (besides my own). I know I don't have time to tackle such a project but I'd be extremely interested in using such a thing. Especially in my day to day work. I currently do a lot of Java <-> Erlang via JInterface, and have been for months, yet there's many tasks I could do better in a language like Haskell.

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Re: [Haskell] Re: Current XML libraries status
by Uwe Schmidt 27 Oct '08

27 Oct '08

Hello David, > I tried to use HXT's readDocument with its tagsoup option for my > application. I couldn't find a way to construct the operation that > didn't run out of memory. I'll attach some code using HaXml's > saxParse so you can see what I want. Is that easy to do in HXT? > I simply want the text of <PMID> and <AbstractText> elements. here's an example, that reads the input in a lazy way. I ran this in ghci with a file containing 2^20 XML Elements. The file was about 18Mb in size. A normal parse with the standard parsec parser ran out of memory on my 1Gb box. This one used within ghci about 200Mb max. ------------------------------------ module Main where import Text.XML.HXT.Arrow import System main = do mapM_ main' names main = do (name:_) <- getArgs runX ( readDoc name >>> fromLA (deep (hasName "PIMD" -- select the nodes <+> hasName "AbstractText" ) >>> getChildren -- get the text >>> getText ) >>> arrIO putStrLn ) putStrLn "main finished" readDoc = readDocument [ (a_tagsoup, v_1) , (a_parse_xml, v_1) , (a_remove_whitespace, v_1) , (a_encoding, isoLatin1) , (a_issue_warnings, v_0) , (a_trace, "1") ] --------------------- Cheers, Uwe Schmidt -- Uwe Schmidt Web: http://www.fh-wedel.de/~si/

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