Xotcl July 2015

xotcl@alice.wu.ac.at

4 participants
3 discussions

Announcement: Next Scripting Framework 2.0.0 available
by Gustaf Neumann 09 May '19

09 May '19

Dear Community, Since releasing the Next Scripting Framework (NSF) 2.0b5, we have received more feedback from early adopters. Many thanks for the helpful and the constructive comments! Since the release of 2.0b5, there have been more than 450 commits to our code repository. The implementation is very stable and has been used for more than two years in production of our large-scale, multi-threaded web environment inside NaviServer. Most of the changes happened in NX and, therefore, on the NSF scripting level, without the need to modify the NSF C layer. The implementation of XOTcl 2 has changed very little. The Next Scripting Framework was tested with Tcl 8.5.17 and Tcl 8.6.2 on Linux, Mac OS X, and in Windows enviroments (MinGW, VC12). Below are the most notable differences in NSF/NX 2.0 final relative to 2.0b5: a) Pluralism reform: Use plural names for structural features of objects and classes, whenever potentially multiple elements are provided or returned. This rule applies now consistently throughout NX. Here are examples from the introspection interface: /cls/ info superclasses /cls/ info subclasses /cls/ info mixins /obj/ info object mixins /cls/ info filters /obj/ info object filters Similarly, there the plural is used for configure options, e.g.: nx:create create Foo -superclasses {C D} Note that abbreviations are allowed as well: nx:create create Foo -superclass {C D} b) Dispatch by arity is gone in NX. XOTcl and earlier versions of NX supported a dispatch-by-arity mechanism for relation slots: o mixin; # arity 1: get value o mixin M1; # arity 2: set value o mixin add M1; # arity 3: use arg 2 for slot methods The problem with this approach is that it is not straight forward to provide meaningful error messages. In addition, one might be irritated about the result of e.g. "o mixin add" (leaving out a class to be added). In the final release, we removed the entailed complexity by relying on a fixed arity of 3 (last form above) for the default slot methods: add, clear, delete, get, guard, set c) Support for querying computed parameters of methods. Earlier versions of NX had several methods to query the parameters for configuring objects of different classes. The configure parameters are determined by the inheritance order in the class hierarchy and are relevant during object creation (e.g. methods "create" or "new"). Now, these configure parameter can be queried using the standard parameter introspection interface for e.g. "new", "create", or "configure", such as in: nx::Object info lookup parameters create The above command call returns the parameters which can be provided to an "nx::Object create ..." invocation. Furthermore, these computed parameters are returned in error messages. d) Support abbreviations of non-positional parameter names (for plain methods, nsf::proc, or "... configure..."). To avoid surprises, especially for computed argument lists, the minimal number of optional trailing characters is set to 4. e) Updated MongoDB interface: The interface was extended in various ways and is now based on mongo-c-driver 1.0.2 and was tested with MongoDB 2.6.5. The driver can be used nicely with e.g. Naviserver by using the c-driver supported connection pool. f) API changes: nx::Object info lookup parameters create /cls/ mixins ... /obj/ object mixins ... /cls/ filters ... /obj/ object filters ... Simplified info methods for interceptors: /cls/ info mixin classes -> /cls/ info mixins /cls/ info filter methods -> /cls/ info filters /obj/ info object mixin classes -> /obj/ info object mixins Dropped methods: /cls/ info mixin guard /obj/ info object mixin guard /cls/ info filter guard /obj/ info object filter guard Instead, use the "-guards" option of "... info ?object? mixins|filters ...". Added methods: /cls/ mixins classes /cls/ filters methods /obj/ object filters methods /obj/ object mixins classes g) Added API documentation: Using tcllib's doctools markup and dtplite, we now provide manpages for: nx::Object nx::Class nx::current nx::next nx::configure The Next Scripting Framework 2.0.0 (containing NX and XOTcl 2.0.0) can be obtained from https://next-scripting.org/ The detailed ChangeLog can be downloaded from https://next-scripting.org/xowiki/download/file/ChangeLog-2.0b5-2.0.0 Best regards - Gustaf Neumann - Stefan Sobernig

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3rd Call For Papers - 22nd Annual Tcl/Tk Conference (Tcl'2015)
by andreask＠activestate.com 28 Jul '15

28 Jul '15

Hello XOTcl Developers, fyi ... 22nd Annual Tcl/Tk Conference (Tcl'2015) http://www.tcl.tk/community/tcl2015/ October 19 - 23, 2015 Comfort Suites Manassas 7350 Williamson Blvd, 20109 Manassas, Virginia, USA [[ Attention! One month to the paper deadline ]] [[ Attention! Registration is open! Please have a look at http://www.tcl.tk/community/tcl2015/register.html ]] [[ Known Speakers -- Keynotes * Kevin Walzer - Tk on the Mac: Past, Present, Future -- Tutorials * Clif Flynt - Advanced Tcl: TclOO Intro New Tcl/Tk Platforms --- Pi and Android * Gerald Lester - Introduction to Tcl 1 Introduction to Tcl 2 Introduction to Tk 1 Programming the Web with Tcl: A Survey of Tools, Tips and Tricks * Sean Woods - Advanced TclOO & Megawidgets in TclOO ]] Important Dates: Abstracts and proposals due August 24, 2015 Notification to authors August 31, 2015 WIP and BOF reservations open July 27, 2015 Hotel Room Release August 25, 2015 Author materials due September 28, 2015 Tutorials Start October 19, 2015 Conference starts October 21, 2015 Email Contact: tclconference(a)googlegroups.com Submission of Summaries Tcl/Tk 2015 will be held in Manassas, Virginia, USA from October 19, 2015 to October 23, 2015. The program committee is asking for papers and presentation proposals from anyone using or developing with Tcl/Tk (and extensions). Past conferences have seen submissions covering a wide variety of topics including: * Scientific and engineering applications * Industrial controls * Distributed applications and Network Managment * Object oriented extensions to Tcl/Tk * New widgets for Tk * Simulation and application steering with Tcl/Tk * Tcl/Tk-centric operating environments * Tcl/Tk on small and embedded devices * Medical applications and visualization * Use of different programming paradigms in Tcl/Tk and proposals for new directions. * New areas of exploration for the Tcl/Tk language Note: We are especially interested in papers for OS X this time, to complement the keynote. Submissions should consist of an abstract of about 100 words and a summary of not more than two pages, and should be sent as plain text to tclconference(a)googlegroups.com no later than August 24, 2015. Authors of accepted abstracts will have until September 28, 2015 to submit their final paper for the inclusion in the conference proceedings. The proceedings will be made available on digital media, so extra materials such as presentation slides, code examples, code for extensions etc. are encouraged. Printed proceedings will be produced as an on-demand book at lulu.com The authors will have 30 minutes to present their paper at the conference. The program committee will review and evaluate papers according to the following criteria: * Quantity and quality of novel content * Relevance and interest to the Tcl/Tk community * Suitability of content for presentation at the conference Proposals may report on commercial or non-commercial systems, but those with only blatant marketing content will not be accepted. Application and experience papers need to strike a balance between background on the application domain and the relevance of Tcl/Tk to the application. Application and experience papers should clearly explain how the application or experience illustrates a novel use of Tcl/Tk, and what lessons the Tcl/Tk community can derive from the application or experience to apply to their own development efforts. Papers accompanied by non-disclosure agreements will be returned to the author(s) unread. All submissions are held in the highest confidentiality prior to publication in the Proceedings, both as a matter of policy and in accord with the U. S. Copyright Act of 1976. The primary author for each accepted paper will receive registration to the Technical Sessions portion of the conference at a reduced rate. Other Forms of Participation The program committee also welcomes proposals for panel discussions of up to 90 minutes. Proposals should include a list of confirmed panelists, a title and format, and a panel description with position statements from each panelist. Panels should have no more than four speakers, including the panel moderator, and should allow time for substantial interaction with attendees. Panels are not presentations of related research papers. Slots for Works-in-Progress (WIP) presentations and Birds-of-a-Feather sessions (BOFs) are available on a first-come, first-served basis starting in July 27, 2015. Specific instructions for reserving WIP and BOF time slots will be provided in the registration information available in July 27, 2015. Some WIP and BOF time slots will be held open for on-site reservation. All attendees with an interesting work in progress should consider reserving a WIP slot. Registration Information More information on the conference is available the conference Web site (http://www.tcl.tk/community/tcl2015/) and will be published on various Tcl/Tk-related information channels. To keep in touch with news regarding the conference and Tcl events in general, subscribe to the tcl-announce list. See: http://code.activestate.com/lists/tcl-announce to subscribe to the tcl-announce mailing list. Conference Committee * Andreas Kupries ActiveState Inc * Arjen Markus Deltares * Brian Griffin Mentor Graphics * Clif Flynt Noumena Corp * Cynthia Lilagan National Museum of Health & Medicine, Chicago * Donal Fellows University of Manchester * Gerald Lester KnG Consulting LLC * Jeff Hobbs ActiveState Inc * Joe Mistachkin Mistachkin Systems * Kevin Kenny GE Global Research Center * Larry Virden * Mike Doyle National Museum of Health & Medicine, Chicago * Ronald Fox CAEN Technologies NSCL @ Michigan State University * Steve Landers Digital Smarties * Steve Redler, IV SR Technology Contact Information tclconference(a)googlegroups.com Tcl'2015 would like to thank those who are sponsoring the conference: * ActiveState Inc * Buonacorsi Foundation * Mentor Graphics * Noumena Corp * SR Technology * Tcl Community Association

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xotcl::nonposArgs
by Michael Aram 18 Jul '15

18 Jul '15

Dear XOTcl/NSF community, in order to contrain the input of certain methods to allow only objects of a certain type/class, e.g.: Utility proc get_object_id_from_sourced_guid { -sourced_guid:sourced_guid } { ... } we have the following code in our code base: if {[info command ::xotcl::nonposArgs] ne ""} { ::xotcl::nonposArgs proc sourced_guid args { if {[llength $args] < 2} return foreach {name value} $args break if {![::xotcl::Object isobject $value]} {error "'$value' is not an object"} if {![$value istype ::foo::bar::SourcedGuid]} {error "'$value' is not of type SourcedGuid but [$value info class]"} } ::Serializer exportMethods { ::xotcl::nonposArgs proc sourced_guid } } This works with XOTcl 1.6, but we now see the following warnings when running the code under NSF: Warning: nsf: Could not find value checker type=sourced_guid defined on ::nx::methodParameterSlot What is the correct way to port this to XOTcl 2.0? Thank you for your help! Michael

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Xotcl July 2015